Option A, B and D are chemical changes and Option C is a physical changes
Physical and Chemical changes:
A change in physical attributes accompanies a physical change. Melting, turning into a gas, changing strength or durability, changing crystal structure or texture, and changing shape, size, color, volume, or density are a few examples of physical qualities.Chemical synthesis, or, alternatively, chemical breakdown into two or more separate molecules, occurs when one material reacts with another to create a new substance. These processes are referred to as chemical reactions, and they often cannot be reversed except by other chemical reactions.Nothing about the original crystalline solid remains in the produced gas and metal. The crystalline solid was therefore a combination that disintegrated into its constituent parts. Chemical changes will result from this process.Water-soluble tea components are combined to make tea. A physical shift occurs when sugar is added to tea. Sugar does not interact with the chemicals in tea; rather, it just sweetens the solution and combines its qualities with those of the compounds.Hence, Option A, B and D are chemical changes and Option C is a physical changes
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Suppose a runner completes a 10K (10.0 km) road race in 45 minutes and 35 seconds.
What is the runner's average speed in miles per hour?
The average speed of the runner in miles per hour would be 8.18 miles per hour.
What is the average speed?The average speed of a moving object is the ratio of the total distance traveled by the object and the total time taken to cover the distance. Mathematically, this can be expressed as;
Average speed = total distance traveled/ total time taken
In this case;
Total distance = 10 km
Total time = 45 minutes, 35 seconds
In order to find the average speed in miles per hour, let's convert the distance from km to mile and the time to hour.
1 km = 0.621371 mile
10 km = 10 x 0.621371
= 6.21371 miles
1 hour = 3600 seconds
60 seconds = 1 minute
45 minutes = 45 x 60
= 2700 seconds
Total time = 2700 + 35
= 2735 seconds
3600 seconds = 1 hr
2735 seconds = 2735/3600
= 0.7597 hour
The average speed of the runner in miles per hour:
6.21371/0.7597 = 8.18 miles per hour
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18) Jamal performs an experiment where he mixes hydrochloric acid and zinc metal together. He writes a chemical equation that he thinks models his experiment.
2HCl(aq) + Zn(s) - ZnCl₂(aq) + H₂(g)
A) Heat was absorbed
B) A precipitate formed.
The color changed.
D) A gas was formed.
Answer:
the answer is D.
Two north poles facing each other will ___ each other.
repel
attract
Answer: repel
Explanation: it's not yet known why like charges repel each other, so
but there's your answer, yw.
Which of the following is a hydroxide ion?
Select one:
O a. H*
Ob. H30
O c. (OH)*
O d. 0²-
Answer:
a
Explanation:
hope this helps for now
what is the equation for the equilibrium constant of 2 CrO 4 2 − (aq) + 2 H + (aq) ⇌ Cr 2 O 7 2 − (aq) + H 2 O (l)
The equation for the equilibrium constant K = [ Cr₂O₇²⁻] [ H₂O ] / [ Cr₂O₇²⁻ ]² [ H⁺]².
What is equilibrium constant ?For a chemical reaction, the equilibrium constant can be defined as the ratio of reactant to product that is used to determine chemical behavior. At equilibrium, the forward reaction rate equals the backward reaction rate.
Equilibrium constants vary with temperature and are unaffected by reaction quantities, catalysts, or inert materials. Furthermore, it is unaffected by reactant concentrations, pressures, or volumes. In general, the temperature dependence of the equilibrium constant is determined by H of the reaction.
Thus, The equation for the equilibrium constant K = [ Cr₂O₇²⁻] [ H₂O ] / [ Cr₂O₇²⁻ ]² [ H⁺]².
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Fill in my blanks
Mass - measured in ____ or tells the amount of matter in an object.
Volume - the amount of ____ that’s an odject _____ _____
Answer:
Mass - measured in kilogram or tell the amoout of matter in an object.
Volume - is the amout of space that's an object taken
2. How many grams of oxygen are formed when 52 grams of aluminum chlorate are
decomposed (Al(ClO3)3)?
(6 pts. /2 pts. for equation - 3 pts. for stoich - 1 pt. final answer)
The mass of the oxygen that is formed from the decomposition of the aluminium chlorate is 27.4 g.
What is a decomposition reaction?We define a decomposition reaction as the kind of reaction that involves the break up of a substance so as to obtain the components of the substance.
The compound that is being broken up can be shown in the equation that we have below;
2Al(ClO₃)₃ → 2AlCl₃ + 9O₂
Thus
Number of moles of aluminum chlorate = mass/ molar mass
= 52 grams /277 g/mol
= 0.19 moles
If 2 moles of aluminum chlorate would form 9 moles of oxygen
0.19 moles of aluminum chlorate would form 0.19 moles * 9/2
= 0.855 moles
Mass of the oxygen = 0.855 moles * 32 g/mol
= 27.4 g
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Which of the following characteristics of K+ channels are important for the selectivity for K+ rather than other ions?
K+ channels are important because carbonyl groups lining the wall of the pore and can interact with the unsolvated K+ ion, balancing the energy needed to remove the hydration shell.
What is the role of K + ion channels in an action potential?Potassium channels play a role in repolarization of the membrane, which follows membrane depolarization by Na, and in some cases Ca, channels during the action potential; this is necessary for returning the membrane to a negative potential to terminate the action potential signal.
What effect does opening K+ channels have on membrane potential?Opening of K+ channels in cell membranes with resulting increase in K+ conductance, shifts the membrane potential in a hyperpolarizing direction ,the K+ equilibrium potential. Hyperpolarization reduces the opening probability of ion channels involved in membrane depolarization and excitation is minimized.
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Select all of the following amino acids that will create salt-bridges.
Serine
Aspartate
Histidine
Valine
Among the given amino acids, serine, aspartate and histidine can create protein salt bridges.
How amino acids take part in salt-bridge formation?Two non-covalent interactions—hydrogen bonding and ionic bonding—combine to form a salt bridge. One of the most significant noncovalent forces in chemistry and in biological systems is ion pairing. In a normal acid-base neutralization process, amino acids interact with one another to create salt. Simple attraction between the positive and negative charges and the shift of the -H (positive ion) from the acid to the amine constitute the reaction.
Amino acids that take part in bridge formation are- The anionic carboxylate (RCOO) of either aspartate or glutamate and the cationic ammonium (RNH3+) from lysine or the guanidinium (RNHC(NH2)2+) of arginine most frequently form the salt bridge. Although these are the most frequent, depending on external variables, additional residues with ionizable side chains like histidine, tyrosine, and serine can also take part in salt bridge formation.
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Serine, aspartate, and histidine can build protein salt bridges among the other amino acids mentioned.
How do amino acids contribute to the creation of salt bridges?
A salt bridge is created when two non-covalent interactions—hydrogen bonding and ionic bonding—combine. Ion pairing is one of the most important noncovalent forces in chemistry and in biological systems. Amino acids interact with one another to produce salt during a typical acid-base neutralization process. The reaction is simply the shifting of the -H (positive ion) from the acid to the amine and the attraction of the positive and negative charges.
The anionic carboxylate (RCOO) of either aspartate or glutamate, the cationic ammonium (RNH3+) from lysine, or the guanidinium (RNHC(NH2)2+) from arginine, are the amino acids that participate in bridge building. Although these are the most frequent, salt bridge creation can also involve other residues with ionizable side chains such histidine, tyrosine, and serine depending on the environmental factors.
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Consider the kinds of intermolecular forces present in the following compounds, and rank the substances in likely order of decreasing boiling point: H2SH2S (34 amuamu), CH3OHCH3OH (32 amuamu), C2H6C2H6 (30 amuamu), ArAr (40 amuamu).
In order of decreasing boiling point, CH3OH > H2S > C2H6 > Ar. The strongest types of bonding are ionic, covalent, hydrogen, and van der waals forces, in that order.
Give examples of each of the three forms of intermolecular forces?London dispersion forces (LDF), dipole-dipole interactions, and hydrogen bonds are different intermolecular forces. All substances have LDF, but molecules can have combination of these three types of intermolecular interactions.
What makes dipole-dipole the most powerful?The dipole-dipole forces increase with increasing polarity. Dipole-dipole forces are in an unique (stronger) case in this situation. It is possible for it to exist between a molecule with an N, O, or F atom that has a hydrogen atom bonded to it directly and another molecule with an N, O, or F atom that has a lone pair of electrons.
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Why do you think the Haití earthquake in 2010 happened?
Both Saturday's earthquake and the one in 2010 are thought to have been caused by the Enriquillo-Plantain Garden fault system, according to the United States.
What is the Haitian problem with the Enriquillo-plantain garden?The Enriquillo-Plantain Garden fault zone (EPGFZ or EPGZ) is indeed a network of active coaxial left lateral-moving strike - slip faults faults that extends along the southern coast of Hispaniola, the island that is home to Haiti and the Dominican Republic.
Where is the fault system between Enriquillo and Plantain Garden?
As one of Haiti's main plate-bounding fault systems, the Enriquillo-Plantain Garden fault zone is very well known. Initially believed to be the cause of the Mw 7.0 earthquake that struck Port-au-Prince on January 12, 2010, the strike-slip fault is located close to the city.
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in the following reaction 2Al + FeO2 ---> Al2O2 +2Fe. If 8 grams of Fe2O3 reacted with an excess of Al the maximum number of moles of Fe could be produced is ? A. 0.100 b. 0.200 c. 0.300 4. 0.400
The maximum number of moles of Fe could be produced is 0.1 option - A is correct.
How are grams and moles converted?The grams to moles formula must be used in order to accurately calculate the number of moles, n, of a substance with a given mass, m, (in grams): M is the material's molar mass, so n = m / M.
According to the periodic table, the molecular mass of iron, to three decimal places, is 55.845 and its elemental symbol is Fe.
Moles = mass/molar mass
Molar mass of Fe = 56
Number of moles of Fe = 8/56
Number of moles of Fe = 0.14moles.
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Use the gizmo to explore whether the number of atoms present affects the half-life that you measure. describe your findings below:
In contrast, the ratio and total quantity of stable atoms are defined by the half-life.Whatever the initial number of atoms, the percent of decrease is constant.They can determine the quantity of original carbon-14 by using the carbon-14 half-life of 5,730 years and the ratio of carbon-12 to carbon-14.
What is the rate of change of the radioactive atom number?Since approximately half of the nuclei of each atom decay with each half-life, the number of radioactive atoms falls as the number of half-lives grows.
Amount has an impact on half-life?A longer dose interval will result from a longer half-life, which is reliant on both clearance and volume of distribution. For example, a CYP1A2 or CYP2C19 substrate can cause a decrease in clearance.
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Oxygen isotope analyses of both deep-sea cores and ice cores (from the Greenland ice sheet) show that the Pleistocene ______.
Oxygen isotope analyses of both deep-sea cores and ice cores (from the Greenland ice sheet) indicate that the Pleistocene was characterized by frequent and widespread climate variability.
This included cycles of glacial advance and retreat.
These changes were caused by variations in the Earth's orbit and tilt, affecting the amount of solar radiation received by different parts of the Earth.
The Pleistocene also saw a series of major ice ages, during which ice sheets and glaciers covered most of the Earth's surface. These ice ages were interspersed with shorter, warmer periods called interglacials. During that time, the Earth's climate resembled the present climate.
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What type of reaction is this? (Multiple choice)
This reaction is an example of double displacement reaction.
What is double displacement reaction?When two reactants change ions to create two new compounds, the reaction is referred to as a double displacement reaction. Double displacement reactions usually result in the development of a precipitate as a product.
The positive-charged cations and negative-charged anions of the reactants swap places (double displacement) to generate two new products in this sort of reaction. Also called: A metathesis reaction or a double replacement reaction are other names for a double displacement reaction.
The equation becomes:
AlBr₃ + K₂SO₄ → KBr + Al₂(SO₄)₃
Aluminium bromide (AlBr₃) reacts with potassium sulphate (K₂SO₄) to form potassium bromide (KBr) along with aluminium sulphate (Al₂(SO₄)₃).
Balanced reaction becomes:
2AlBr₃ + 3K₂SO₄ → 6KBr + Al₂(SO₄)₃
2 mol 3 mol 6 mol 1 mol
In this reaction, two moles of aluminium bromide react with three moles of potassium sulphate to produce six moles of potassium bromide along with one mole of aluminium sulphate.
So, this reaction is an example of double displacement reaction.
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Classify each chemical reaction as endothermic or exothermic.
You are currently in a sorting module. Turn off browse mode or quick nav, Tab to items, Space or Enter to pick up, Tab to move, Space or Enter to drop.
Endothermic reactions
Exothermic reactions
Answer Bank
2H2(g)+O2(g)⟶2H2O(l)+heat2C2H2(g)+5O2(g)⟶4CO2(g)+2H2O(l)+heatCH4O(l)+heat⟶CO(g)+2H2(g)
2CO2(g)+heat⟶2CO(g)+O2(g)
Exothermic reactions are
1) 2H2+O2 ⇒2H20+Heat
2) 2C2H2+5O2⇒4CO2+2H20+Heat
Endothermic reactions are
3) CH4+Heat ⇒CO+2H2
4) 2CO2+Heat⇒2CO+O2
What are exothermic and endothermic reactions?
Exothermic reactions are those reactions in which energy is released and in endothermic reactions energy is required to proceed the reaction.
1) & 2) are exothermic because energy is released in reaction 3) & 4) are endothermic because energy is required so called endothermic reaction.
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Find the number of grams in a 1.25 M solution of potassium nitrate (NO3) if we have
160 ml of the solution.
Answer:
12.4 g
Explanation:
M=1.25M
v=0.16L
molar mass = 62 g per mole
M=n/v
n=M*v
n=1.25M*0.16
n=0.2moln=mass of a substance /molar massmass of substance = n * M
m=0.2mole *62 g/mole
m=12.4g
A mixture of gases for the synthesis of ammonia with a mass of 1000.0 g at a temperature of 0 0C and pressure 2 atm occupies a volume of 1000.0 L.
1. Determine the volume fraction of gases in the mixture (in percent).
2. Write the equations for ammonia synthesis reactions in laboratories (3 methods).
3. Give the equation for the reaction of ammonia: a) with metal; b) with a non-metal; c) with metal oxide; d) with acid; e) with salt.
Answer:
1. or A. : .209%
B. : 1000.0 x .20
Explanation:
An unknown salt AS X H₂O was analyzed and found to contain 16.4 percent
.
water. If the anhydrous salt has a formula mass of 183 amu, find the water of
crystallization (X) for the hydrate.
the unknown salt AS X H₂O was analyzed and found to contain 16.4 percent water. If the anhydrous salt has a formula mass of 183 amu then the water of crystallization (X) for the hydrate is 7.
What is anhydrous salt?Those compound from which all the water molecules are removed is termed as anhydrous salt. These types of compounds can be used as desiccants (drying agents) that means they can absorb water from their surrounding.
Water of crystallization:In a crystalline state of a salt the no. of molecules of water are present in a definite molecular proportion is known as Water of crystallization.
Example : CaSO4.5H2O consist of 5 Water of crystallization.
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Analyses revealed that 16.4% of the unidentified salt AS X H2O contained water. The hydrate's water of crystallisation (X) is 7 if the anhydrous salt's formula mass is 183 amu.
What is sodium anhydrous?
Anhydrous salts are substances from which all of the water molecules have been eliminated. These kinds of substances can serve as desiccants, or drying agents, by absorbing water from their surroundings.
Water of crystallisation is the term used to describe the quantity of water molecules present in a specific molecular proportion in a salt that has crystallised.
Example: The water of crystallization for CaSO4.5H2O is 5.
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Perform the following operation
and express the answer in
scientific notation.
6.50×105 +5.40×104
? ]×10[?]
According to scientific notation, the answer of the operation is 7.04×10⁵.
What is scientific notation?Scientific notation is defined as a way of expressing numbers which are too large or too small so that they can be easily written in decimal form. It can be referred to the scientific form or the scientific index form or even the standard form.
Base ten notation is used by scientists, engineers as it helps in simplification of arithmetic operations. It contains the significant figures which include all non-zero numbers , the zeroes between significant digits and zeroes which are needed to be significant.
In scientific notation, the base should always be ten. The exponent should be a non-zero integer and it can be either positive or negative.In this case answer is obtained as 6.50×10⁵ +0.540×10⁵=7.04×10⁵.
Thus, the answer in scientific notation is 7.04×10⁵.
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. How many grams of CaCl₂ (molar mass = 111
g/mol) are needed to prepare 100. mL of 0.100
M solution? Show your calculation to receive
full credit.
A) 55.5 g
B) 111 g
C) 222 g
D) 555 g
Answer:
1.11 grams CaCl₂
**I am aware that this is not one of the answer choices, but I pretty confident that this should be the correct answer according the the given values
Explanation:
To find the mass of CaCl₂ necessary, you need to
(1) convert the volume from mL to L (1,000 mL = 1 L)
(2) calculate the amount of moles (M = moles / L)
(3) convert moles to grams (using the molar mass)
It is important to arrange the conversions/ratios in a way that allows for the cancellation of units. The final answer should have 3 sig figs like the given values.
(Step 1)
100. mL CaCl₂ 1 L
-------------------------- x ------------------- = 0.100 L CaCl₂
1,000 mL
(Step 2)
Molarity (M) = moles / volume (L) <----- Molarity ratio
0.100 M = moles / 0.100 L <----- Insert values
0.0100 = moles <----- Multiply both sides by 0.100 L
(Step 3)
Molar Mass (CaCl₂): 111 g/mol
0.0100 moles CaCl₂ 111 grams
--------------------------------- x --------------------- = 1.11 grams CaCl₂
1 mole
What is the reaction equation for NaK or Sodium Metal and Potassium Metal
WILL GIVE BRAINLIEST
Sodium reacts faster, producing enough heat to melt itself and occasionally ignite the hydrogen gas, resulting in the characteristic yellow-orange flame of sodium. The potassium reacts violently, bursting into a flame with the typical violet color of potassium.
What is potassium ?Potassium has the chemical symbol K and the atomic number 19. Potassium is a silvery-white metal that can be cut with a knife with little effort. In seconds, potassium metal reacts with atmospheric oxygen to form flaky white potassium peroxide.
Sodium and potassium, for example, react violently with cold water. These are exothermic reactions. The reaction is so violent and exothermic that the hydrogen produced instantly catches fire.
Thus, The potassium reacts violently, bursting into a flame with the typical violet color of potassium.
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The NMDA receptor is a neurotransmitter- and voltage-dependent ion channel. When the _____ is at the resting potential, Mg2+ blocks the ion channel, preventing Ca2+ from entering.
Answer:
postsynaptic membrane
Explanation:
Hope it helps!
How much energy is required to heat 100g of water at 25°C to steam at 125°C?
The amount of energy required to heat 100 g of water is 268000 J.
What is energy?Energy is the ability or the capacity to perform work.
To calculate the amount heat energy required to change the water to steam, we use the formula below.
Formula:
Q = CmΔt+cΔt........... Equation 1Where:
Q = Amount of energym = Mass of the waterΔt = Change in temperature of the waterc = Latent heat of vapourization of waterC = Specific heat capacity of the waterFrom the question,
Given:
m = 100 g = 0.1 kgΔt = 125-25 = 100 °CC = 4200 J/kg°C. c = 2260000 J/kgSubstitute these values into equation 1
Q = (0.1×100×4200)+(2260000×0.1)Q = 42000+226000Q = 268000 JHence, the amount of energy required is 268000 J.
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Label each diagram (A, B, and C) as either convergent plate boundary, divergent plate boundary, or transform plate boundary. three plate boundaries
Diagram A is a divergent plate boundary, B is a convergent plate boundary and C is a transform plate boundary.
What are tectonic boundaries?Plate tectonics are boundaries between two or more plates moving towards each other, away from each other or past each other. When these occur they are known as either convergent, divergent or transform plate boundaries.
A convergent plate boundary, the tectonic plate converge by subduction, where the thin ocean crust slides beneath thick crust. It is divergent when the linear features are moving away from each other. For transform plate, the broad zone slides northwestward past the north plate.
The full question is:
Label each diagram (A, B, and C) as either convergent plate boundary, divergent plate boundary, or transform plate boundary. three plate boundaries
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It's a great day at the beach, and you're there for some fun and sun! One reason the day is so special is that the weather is so pleasant—sunny and warm. Energy from the sun warms the beach by (1) _______________. The breeze is warm enough to keep you warm, but it also keeps you from overheating. Ocean breezes move because energy is (2) ________________. When you lie down on the sand, you spread a beach towel down so that the sand will not make you too hot by (3) ______________________.
It's a great day at the beach, and you're there for some fun and sun! One reason the day is so special is that the weather is so pleasant—sunny and warm. Energy from the sun warms the beach with Radiation. The breeze is warm enough to keep you warm, but it also keeps you from overheating. Ocean breezes move because energy is Convection. When you lie down on the sand, you spread a beach towel down so that the sand will not make you too hot by transferring heat by Conduction.
Radiation is energy that comes from a source and travels through space at the speed of light. This energy has an electric field and a magnetic field.
Heat is transferred through convection, which is the large-scale movement of molecules inside gases and liquids. Conduction is used to move heat from the object to the fluid initially, but fluid motion is responsible for the bulk of the heat transfer.
Heat energy is transferred through the mechanism of conduction when nearby atoms or molecules collide. In solids and liquids, where particles are more closely spaced, conduction happens more easily than in gases, where particles are more widely spaced.
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according to the spectrochemical series, which of the following ligands has the strongest splitting field?
The increasing order of the crystal field splitting- I− < Br− < S2− < SCN− < Cl−< N3 < F−< NCO−< OH−<C2O42−< O2−< H2O < acac− < NCS− < CH3CN <gly <py < NH3 < en < bipy < phen < NO2− < PPh3 < CN− < CO.
Describe the spectrochemical sequence.The ligands (affections to a metal ion) are listed in the spectrochemical series according to the strength of their field. The series was created by superimposing various sequences acquired from spectroscopic research because it is impossible to generate the full series by examining complexes with the single metal ion.
Which ligands in the spectrochemical series are strong field ligands?The ligands cyanide and CO are classified as strong-field ligands, whereas the halides are weak-field ligands. Ligands such as water and ammonia are said to create medium field effects.
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After considering the results of the classification tests, the possibilities can be narrowed down further by determining the melting point of the
A derivative.
B Schiff addition product.
C iodoform.
D triiodo compound.
After considering the results of the classification tests, the possibilities can be narrowed down further by determining the melting point of the B Schiff addition product.
What two facts can you infer about your product based on its melting point range?
A compound's melting point is helpful in two ways: it provides information on the composition's identity and degree of purity. Impurities will affect a compound's melting point, resulting in broader and lower melting point ranges.
First, the solubility test must be performed in order to remove soluble contaminants from the target molecule. The desired chemical and the soluble impurities are dissolved in a minimum of near or boiling solvent once a suitable solvent has been selected. The solution is then given time to gradually cool.
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For the following reaction, 20.4 grams of sulfur dioxide are allowed to react with 9.97 grams of oxygen gas .
sulfur dioxide ( g ) + oxygen ( g ) sulfur trioxide ( g )
What is the maximum amount of sulfur trioxide that can be formed?
What is the FORMULA for the limiting reagent?
What amount of the excess reagent remains after the reaction is complete?
Answer:
1.3
Explanation:
A chamber contains equal molar amounts of C₂H₂, CH₄, and H₂. If the total chamber pressure is 5.00 atm, then the partial pressure of C₂H₂ is:
Answer: 1.67 atm
Explanation:
Since the molar amounts are equal, this means that the partial pressure of acetylene is 1/3 of the total chamber pressure.