Answer:
a. glucose c. ribose b. adenine d. two phosphate groups user: all organisms need energy to perform different functions. cells are able to ...
Nuclear decay occurs according to first-order kinetics. How long will it take for a sample of titanium-45 to decay from 65.0 grams to 25.0 grams? The half-life of titanium-45 is 3.08 hours 2.15 hours 32.9 hours 5.13 hours
A sample of titanium-45 will degrade from 65 grams to 25 grams in 4.24 hours.
The formula for the half-life of a first-order reaction is = 0.693/k.
Half-life is 3.08 hours, given.
So k = 0.225
First order reaction rate is calculated using:
where k is the reaction rate and 0.225 is the reaction time
R' = 25g, the total quantity.
original quantity = 65g
With these parameters entered, we obtain t=4.24 hours.
As a result, a sample of titanium-45 will degrade from 65.0 grams to 25.0 grams in 4.24 hours.
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66.7 mL of Ethanol was dissolved in 222.2 mL of water. What is the volume % of the ethanol in the solution?
Respond with the correct number of signficant figures in scientific notation. (Use E notation and only 1 digit before decimal, for example, 2.5E5 for 2.5 times 10 to the power of 5)
66.7 mL of Ethanol was dissolved in 222.2 mL of water. the volume % of the ethanol in the solution is 30.0 %.
Given that :
volume of the solute = 66.7 mL
volume of the solution = 222.2 mL
by using the volume % formula we can directly determine the volume % of ethanol, the percent by volume expression is given as :
volume % = (volume of solute / volume of solution ) × 100 %
volume % = (66.7 / 222.2 ) × 100 %
volume % = 0.300 × 100 %
volume % = 30 .0 %
( v / v ) % = 30.0 %
Thus, the percent by volume is 30.0 %.
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A student draws a diagram that describes how she thinks people see in the dark. Based on her drawing, she predicts that if people stay
in a totally dark room for a long time, eventually their eyes will adjust to the darkness and they will be able to see.
When she tries this experiment in a totally dark room, it turns out that her prediction was incorrect, and that she is unable to adjust to
the darkness. What should she do with her drawing?
Because her drawing does not accurately represent what really happens, she should make a new version of it that better predicts what she
actually experienced in the dark room.
Because her drawing was not useful in making an accurate prediction, she should discard it and not use drawings anymore to make
predictions.
Because her drawing represents how she thinks the world works, she should not change it but should be confident that she can use it to
make accurate predictions.
O
Because her drawing represents how she thinks the world works, she should use it to make other predictions and keep checking them until
one of them turns out to be correct
Answer:
A: Because her drawing does not accurately represent what really happens, she should make a new version of it that better predicts what she actually experienced in the dark room.
the pka of acetic acid (hc2h3o2) is 4.8. if you make a buffer that contains 0.1 m hc2h3o2 and 0.2 m nac2h3o2, what is the approximate ph of the solution?
Solutions Buffer. pH of solution is adjusted by adding 0.10 M HCl to 100 mL of water. A buffer aids in pH maintenance while adding M NaCH. 3. COO (sodium acetate) (sodium acetate).
How do I figure out pKa?The negative log of the Ka is known as the pKa. All we would need to do is take the Ka and the negative log of it in order to determine the pKa for methanol. Therefore, the pKa is equal to the negative log of 2.9 x 10 16 .
How is pKa determined from pH?There are distinct Ka and pKa values for each dissociation. The weak acid and its conjugate base are present in equal amounts when the moles of base added are half that of the total moles of acid. CB/WA is equal to 1, and the HH equation states that pH = pKa + log(1) or pH = pKa.
Calculation:0.10 M HCl to 100 mL of water
pKa for methanol = 2.9 x 10 16 .
pH = pKa + log(1) or pH = pKa.
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If you know your speed and how long you have been traveling, then you can calculate your dsitance with the formula
Speed is calculated as follows: speed = distance x time. Knowing the units for distance and time is necessary to determine the units for speed. Then distance = speed/time.
What is distance?The distance traveled must be divided by the amount of time spent traveling in order to calculate speed. Divide the distance by the speed to calculate the time. Add the speed and the time together to get the distance. These equations can be seen as s=d/t when speed, distance, and time are all given.
The distance formula, d = st, or distance equals speed times time, can be used to calculate distance. Speed and rate are comparable because they both denote a certain amount of travel per unit of time, such as miles per hour or kilometers per hour. If speed s is equal to rate r, then r = s = d/t.
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At the end of the diffusion process, the concentration of substances on each side is.
At the end of the diffusion process, the concentration of substances on each side is. equal. This is because the diffusion process causes the substances to move from areas of high concentration to areas of low concentration until they are evenly distributed.
What is concentration?
Concentration in chemistry is calculated by dividing a constituent's abundance by the mixture's total volume. Mass concentration, molarity, number concentration, as well as volume concentration are four different categories of mathematical description. Any type of chemical mixture can be referred to by the term "concentration," but solutes as well as solvents in solutions are most frequently mentioned. There are different types of molar (amount) concentration, including normal concentration as well as osmotic concentration. The word "concentration" is derived from the French verb "concentrer," which means "to put at the centre" and comes from the root con-.
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Which TWO of the following changes can be classified as physical
A. Ice melting on a warm day
B. Fireworks going off on July 4th
C. Baking soda reacting with vinegar
D. Glass shattering as it hits the floor
The two changes that can be classified as physical are as follows:
Ice melting on a warm day (option A)Glass shattering as it hits the floor (option D).What is a physical change?A physical change in chemistry is a change affecting the form of a chemical substance, but not its chemical composition.
When matter changes its observable properties, we can say it has undergone a physical change.
Physical change is a type of change where the physical properties of matter change. Physical changes include;
State of matterchange in colourchange in odoursolubilityTherefore, melting of ice, which is a change of state and shattering of glass are examples of physical change.
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one or more substances are changed or converted into other substances during reactions.
A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products.
What does the term chemical equation mean?
A chemical equation is a formula that lists the reactants and products of a chemical process. The reactants are to the left of the arrow, and the products are to the right. They will always be written in the same manner as a mathematical equation, from left to right. On occasion, a symbol will appear above or below the arrow to denote a prerequisite for the response to proceed. Products are the end result of chemical reactions that either break down an existing substance or create a new one. For instance, you can create edible table salt by combining solid sodium and gaseous chlorine (NaCl). This reaction is very flammable and produces a lot of heat (exothermic reaction).Hence, chemical reaction is the process.
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Potassium iodide is an ionic compound. (i) describe what happens, in terms of electron loss and gain, when a potassium atom reacts with an iodine atom.
Iodine atoms gain electrons in this process, resulting in negatively charged iodide ions, while potassium atoms lose electrons, resulting in positively charged potassium ions. There is oxidation and reduction.
What does oxidation mean?The oxidation status of the substrate can change during redox reactions. Similar to how losing electrons or increasing the oxidation state is oxidation while gaining electrons is reduction.
When oxygen comes into contact with a material or an element, an oxidation reaction occurs. Another way to look about oxidation is as the procedure through which the species of reactants lose their hydrogen. Oxidation is the loss of electrons in a molecule, an atom, or an ion.
Oxidation reactions produce new functional groups in molecules or change existing functional groups in molecules.
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A beaker contains a 25 ml solution of an unknown monoprotic acid that reacts in a 1:1 stochiometric ratio with naoh. Titrate the solution with naoh to determine the concentration of the acid.
The molarity of the acid is : 0.82 Molar
Calculate the molarity of acid?
Volume of acid = 25 ml
Molarity of base = 0.5 M
Volume of base = 41.00 ml
Since, acid and base reacts in 1:1 stoichiometric ratio, we can use the molar equivalence formula as:
M(acid) × V(acid) = M(Base) × V(Base)
M(acid) = 0.82 M
What is Molarity?
Molarity (M) is the amount of a substance in a given volume of solution. Molarity is defined as the number of moles of solute per liter of solution. Molarity is also called the molarity of a solution.
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Which intermediate product does not
evolve into a gas?
A) NH₂OH(aq)
B) H₂CO3(aq)
C) H₂SO3(aq)
D) NaCl(aq)
Answer:C
Explanation:I got it correct not no genius though.
which gas sample has the greater mass
Answer:
what are the gas samples
what component in the solar cell provides electrons to replace the electrons released by the dye?
The component in the solar cell system which provides electrons to replace the electrons released by the dye simply is the graphite layer.
How the graphite layer release electrons to replace the dye electronsThe graphite layer is one of the major parts oth the solar cell. It help in the provision of electrons by acting as a counter electrode within the electrolyte. In order, this layer is part responsible for replacing electrons produced by dyes.
In conclusion, we can now confirm from all said and done from above that the solar cell too has a way of producing electrons.
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Please help.
Check the answer that applies; there may be more than one answer.
The types of chemical reactions described by the given chemical equations are as follows:
Cu (s) + 2 AgNO₃ (aq) ---> 2 Ag (s) + Cu(NO₃)₂ (aq) : Single replacement reaction
C₃H₈ + 5 O₂ ------> 3 CO₂ + 4 H₂O : Combustion reaction
3 N₂H₄ ---> 4 NH₃ + N₂ : decomposition reaction
4 Fe + 3 O₂ --> 2 Fe₂O₃ : Combination reaction
Mg(OH)₂ + 2 HCI --> MgCl₂ + 2 H₂O : neutralization reaction
What are chemical reactions?Chemical reactions are reactions in which chemical changes occur in the substances resulting in the formation of new products.
There are several types of chemical reactions and they include the following:
Combination - two or more substances combine to form a larger single productDecomposition - a larger single compound breaks down into simpler productsSingle Replacement - an element or radical replaces another in a compoundDouble Replacement - exchange of ions between two compounds.Combustion - reaction of a substance with oxygen to release heat and lightNeutralization - reaction of acid and base to form salt and water.Learn more about chemical reactions at: https://brainly.com/question/16416932
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write any two utilities of the radiation obtained from nuclear reaction
Answer: Radiation (obtained by nuclear reactions) is used in medicine, academics, industry, and electricity. In addition to that, radiation has been useful in areas such as agriculture, archaeology, space exploration, law enforcement, geology, and many others.
The radiation emitted from nuclear reactions are used in various fields such as medical field, agriculture, research fields etc.
What is nuclear reaction?Unstable radioactive elements undergo emission of charged particles such as alpha or beta and produce their isotopes or new elements. This reactions involving the change to atomic nuclei by reducing the number of protons or neutrons is called nuclear reactions.
The radiation emitted from nuclear reaction is very useful in many fields, especially in medical fields. Many diagnostic techniques are based on radiation. Similarly radiation is used in cancer treatments.
Suitable radiations are used in agricultural field for pest control. There is a branch itself in science to study the various utilities of radiations and there are tremendous experiments and researches are conducted based on suitable radiations.
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what volume of methane gas, ch4, has the same number of atoms as 6.00 l of krypton gas at the same temperature and pressure?
6l volume of methane gas, ch4, has the same number of atoms as 6.00 l of krypton gas at the same temperature and pressure.
The Avogadro's law can be used to connect the volume of the gas to its number of moles. This law asserts that at the same temperature and pressure, gases with the same molar amount will occupy the same volume. The number of atoms in the two gases must be equal if the number of moles is the same. Accordingly, if Kr and methane both have the same number of particles, their respective volumes would be the same.
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What do atoms consist of:____.
A. elements
B. compounds
C. charged and uncharged particles
D. neutrons moving around a nucleus
Answer: i think is D
Explanation:
kiki makes a table to compare the particles in a magnesium atom to those in a magnesium ion. a 3 column table with 3 rows. the first column is not labeled but have entries protons, neutrons, electrons. the second column is labeled magnesium atom with entries 12, 12, 12. the last column is labeled magnesium ion with entries x, y, z. she knows that a magnesium ion has an electric field that points away from the ion. what values should she use to complete her table?
The neutral magnesium atom has 12 protons, 12 neutrons, and 12 electrons.Ten electrons, twelve protons, and twelve neutrons make up the magnesium ion.
Protons, neutrons, and electrons make up an element's atom. Protons and electrons are distributed equally among neutral atoms. Gain or loss of electrons causes the formation of ions.
For the atom of magnesium: The neutral magnesium atom has 12 protons, 12 neutrons, and 12 electrons.
Regarding the magnesium ion:
It possesses two less electrons than the magnesium ion. As a result, there are 10 electrons, 12 protons, and 12 neutrons in each magnesium ion.
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Answer:B:12 12 10
Explanation:edge
Determine the empirical formula of a compound containing 0.928 g of gallium and 0.412 g of phosphorus.
Empirical formula of a compound can be determined using their number moles in the given weights. Thus number of moles of both gallium and phosphorous are 0.013 . Thus, empirical formula of this composition is GaP.
What is empirical formula?Empirical formula of a compound is derived from the number of moles of each element present in the compound. It will be different from the molecular formula of the compound.
Atomic mass of phosphorous = 31 g/mol
Atomic mass of gallium = 69.72 g/mol
Number of moles of 0.412 g of P = 0.412 g/31 g = 0.013.
No.of moles in 0.928 g of Ga = 0.928 / 69.72 = 0.013.
The ratio of their number of moles = 0.013 :0.013 = 1 :1.
Therefore, the empirical formula of the compound containing 0.928 g of gallium and 0.412 g of phosphorus is GaP.
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Referring to the drawing to the right.the beaker contains a 5% salt solution and the bag contains a 15%salt solution in which direction will water move
According to the concept of diffusion the water will move from 5% salt solution to 15%salt solution.
What is diffusion?Diffusion is defined as the process of movement of molecules which takes place under concentration gradient. It helps in movement of substances in and out from the cell.The molecules move from lower concentration region to a higher concentration region till the concentration becomes equal.
There are 2 main types of diffusion:
1) simple diffusion-process in which substances move through a semi-permeable membrane without the aid of transport proteins.
2) facilitated diffusion- It is a passive movement of molecules across cell membrane from higher concentration region to lower concentration.
There are 2 types of facilitated diffusion one is osmosis and dialysis.
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Which energy output objects work with the solar panels?
Answer:
The energy output objects that work with solar panels include solar inverters, charge controllers, batteries, and electric grid systems.
Explanation:
vessel a contains co(g) at 0 oc and 1 atm. vessel b contains so2(g) at 20 oc and 0.5 atm. the two vessels have same volume. a. which vessel contains more molecules? b. which contains more mass? c. in which vessel is the average kinetic energy of molecules higher? d. in which vessel is the rms speed of molecules higher?
Vessel B has more mass. Explanation: Because temperature and average kinetic energy of molecules are directly proportional to each other.
The average kinetic energy of a substance's particles is directly inversely correlated with its temperature. As the temperature increases, the particles must travel more quickly because their mass remains constant.
The relationship between a gas particle's average kinetic energy and temperature is linear. The pace at which the gas molecules flow rises with temperature. At a specific temperature, the average kinetic energy of all gases is identical.
Molecules of gas move more quickly when they are lighter. Because of this, as the gas's temperature rises, its volume also does so. The more gas particles there are, the more likely it is that they will hit the container's walls, hence the frequency of collisions must rise.
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If you combine 400.0 mL
of water at 25.00 ∘C
and 100.0 mL
of water at 95.00 ∘C,
what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.
Therefore, the final temperature of the mixture is 43.15 C.
What is Temperature?
The term "temperature" refers to a measurement of an object's average kinetic energy, which is a category of energy linked to motion and used to describe how hot or cold an object is. But how hot and how frigid are they exactly? Hot and cool are not really scientific concepts.A physical scientist would check the metal's liquid state's temperature to find the answer. It is less confusing to use temperature instead of phrases like hot or cold.
Let the mixture's final temperature be toC (clearly, 95.00 oC > t oC > 25.00 oC).
Cold water sample's mass is equal to (volume times density) or (400 mL times 1.00 g/mL) = 400 g.
Water has a specific heat capacity of 4.184 J/g.
Heat gained by cold water equals mass times the water's specific heat capacity times the temperature change.
= (400g) x (t - 25) C x (4.184 J/g)
Hot water sample mass equals 140 g (140 mL x 1.00 g/mL).
Heat lost by hot water is calculated as (140 g) x (4.184 J/g. C) x (95 - t) C.
400 ( t - 25 ) = 140 ( 95 - t)
400 t - 10000 = 13300 - 140t
540t = 23300
t = 43.15
Therefore, the final temperature of the mixture is 43.15 C.
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How many liters of carbon dioxide are produced in the combustion of 1.00 g of octane, C8H18?
2C8H18 + 25O2 --> 16CO2 + 18H2O
Answer:
1558.27 ml or 1.56 L
Explanation:
The molecular mass of octane is 114.23 g/mol so 1.00 g of octane equals to:
(1.00 g( x (1 mol/114.23g) = 0.00875 mol
From the chemical equation:
2C8H18 + 25O2 --> 16CO2 + 18H2O
you know that 2 mol of octane will produce 16 mol of CO2
so 0.00875 mol of octane will produce:
0.00875 x (16/2) = 0.07 moleof CO2
The molecular mass of CO2 is 44.01 g/mol so 0.07 mol will equal to
44.01 x 0.07 = 3.0807 g of CO2
Under “standard” conditions of 0 degrees Celsius and 1 atmosphere of pressure, carbon dioxide exhibits a density of 0.001977 g/mL
since d = m/V => V = m/d = 3.0807/0.001977 = 1558.27 ml or 1.56 L
NOTE: if you have a specific temperature or pressure, you can use the formula for ideal gas PV=nRT to solve for volume.
I hope this helps you to understand the question
current u.s $1 coins are composed of manganese-brass consisting of 6.0% zinc, 3.5% manganese, 2.0% nickel, and the remaining Cu. each dollar has a total mass of 8.1 G. Calculate the mass of each of the four metal constituents in the dollar coin 
The mass of the zinc in the dollar coin is about 0.486 grams, the mass of the manganese is about 0.285 grams, the mass of the nickel is about 0.162 grams, and the mass of the copper is about 7.135 grams.
What is an alloy?
An alloy is the mixture of two or more elements, at least one of which is a metal. Alloys are typically created to improve upon the properties of the individual metals, such as increasing strength or corrosion resistance. They are used in a wide range of applications, including in the construction of buildings, vehicles, and electronic devices. The specific properties of an alloy depend on the metals that it is made of and the proportion of each metal in the mixture.
According to the problem:
The mass of each metal in the dollar coin has some specific percentage.
Multiply the percentage composition of the metal by the total mass of the coin to determine the mass percentage for each metal:
Zinc: [tex]6.0\% \times 8.1 grams = \frac{6.0}{100} \times 8.1=0.486 grams[/tex]
Manganese: [tex]3.5\% \times 8.1 grams = \frac{3.5}{100} \times 8.1=0.285 grams[/tex]
Nickel: [tex]2.0\% \times 8.1 grams = \frac{2.0}{100} \times 8.1=0.162 grams[/tex]
Copper:
[tex](100\% - 6.0\% - 3.5\% - 2.0\%) \times 8.1 grams = 88.5\% \times 8.1 grams = \frac{88.5}{100} \times 8.1=0.486 grams[/tex]
So the mass of the zinc in the dollar coin is about 0.486 grams, the mass of the manganese is about 0.285 grams, the mass of the nickel is about 0.162 grams, and the mass of the copper is about 7.135 grams.
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Which body systems within marching band members are interacting so they can play their instruments while walking in the parade? List the systems below.
Squirrel: Digestive, Circulatory, Muscular, and Nervous systems.
Soccer: Skeletal/muscular, circulatory, respiratory, and body systems.
What is body systems?For Squirrel:
The digestive system functions to break food down into smaller pieces that are more suitable for swallowing and absorbing the available nutrients. It transports to various cells of living organisms.
musculature allows animals to keep their balance on branches and avoid falling.
The nervous system controls all living things. The nervous system controls all physical activity. Among many other functions, it is involved in maintaining balance and maintaining alertness during meals.
Soccer player:
This person is trying to hit the ball to score a goal. He seems to be adjusting his arms and legs to allow this.
The muscular and skeletal systems work together to support and strengthen the body. They allow the movement of the whole body to reach the target.
The respiratory system is also involved in this person's running performance. He has to breathe constantly to get enough oxygen while running and exhaling exhaust fumes.
The circulatory system transports oxygen to various cells in the body that use it on demand, especially muscle cells. The system also removes waste.
The nervous system controls all physical activity. It performs a variety of functions, including maintaining balance and coordination while running, alerting other players and focusing on the ball, and controlling a player's thoughts and strategies during the game.
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Given 5.67 x 1023 molecules of NaF, how many moles are present?
Answer:
a
Explanation:
what is the name of the compound made of zinc ions, zn⁺², and fluoride ions, f⁻¹?
Zinc fluoride is the term given to the mixture of the ions zinc (zn+2) and fluoride (f1).
Is zinc reactive or stable?Reactivity, by a reaction with the carbon dioxide in the air. Zinc emits zinc oxide fumes as it burns in the air, which produces a vivid bluish-green flame. With acids, alkalis, and other non-metals, zinc interacts easily.
With what can zinc react?Under normal circumstances, zinc and air quickly react, gradually generating a dull, grey zinc oxide covering. Zinc also combines to halogens, oxygen, chalcogens, alkalis, acids, ammonia and ammonium salts, as well as less reactive metals. Zinc is an amphoteric metal because it may react with the both acids and alkalis.
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why should care be taken tha tht easample is above the solvent level before the tlc plat eis placed into the devleioping hcambe
If the solvent level covers the sample, the sample spot will be washed off into the solvent before it travels up the TLC plate
The intermolecular interactions between the solvent and the solute are the main determinant of the solubility of the solute in a given solvent. The solute will dissolve in the solvent if the solvent surrounds and solvates the solute. In contrast to interactions between the solute and other solutes or between the solvent and other solvents, the solute must therefore create greater interactions with the solvent in order to dissolve. It is questionable if a homogeneous solution will develop in a mixture if the solvent-solute interactions are weaker than the solvent-solvent interactions and the solute-solute interactions.
why should care be taken tha tht easample is above the solvent level before the tlc plat eis placed into the devleioping hcambe
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what happens to water with dextrose after a few days?
Since dextrose cannot be autoclaved and IV administration makes sterility essential, even if the solution may be chemically stable for months, the shorter BUD that will be utilized is 14 days according on USP sterility requirements.
What do you mean by Dextrose ?A basic sugar, glucose has the chemical formula C6H12O6. The most prevalent monosaccharide, a type of carbohydrate, is glucose.
(Dextrose dextrorotary glucose), a monosaccharide made from corn, is frequently referred to as "corn sugar" in commerce. It is additionally called glucose. A very refined white sugar, corn sugar has no corn (maize) flavor. Hexose-type sugar glucose contains a group of six carbon atoms.
A simple sugar derived from corn or wheat with the term dextrose is chemically equivalent to glucose, or blood sugar. Dextrose is a typical sweetener used in baked products and is present in things like processed foods and corn syrup.
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