Answer:
baking cookies
Explanation:
One example of using a scientific method is baking cookies. You make a hypothesis that you cookies will be done in 15 minutes. Then, after 15 minutes, you see that either your hypothesis was correct and you cookies are perfect or you need to bake them longer making you hypothesis incorrect. (please change the wording up a bit if you want. i tried to make it make the most sense)
Answer:
Explanation:
When you loose your phone. You try to remember where you last used your phone, and question yourself where you might have left it. If you say that you probably left it in the kitchen, that would be like your hypothesis. Then you go look for it where you thought you left it which would be your experiment. If maybe it is not there that would be like your conclusion so you would reject your hypothesis because it was wrong. Then you try the scientific method again but with a different hypothesis, like that maybe you left it in the living room. You do your experiment which is when you go look for it. In the conclusion if your hypothesis was right you accept your hypothesis. That can be an example of how we use the scientific method in our everyday lives.
When a 0.860 g sample of an organic compound containing C, H, and O was burned completely in oxygen, 1.64 g of CO2 and 1.01 g of H2O were produced. What is the empirical formula of the compound?
Answer:
C₂H₆O
Explanation:
Empirical formula is the simplest ratio of atoms present in a molecule. To solve this question we must find the moles of C, H and O in order to find the simplest ratio of this atoms.
To solve this question we must find the moles of C from CO2, moles of H from H2O and moles of O from the difference of masses of C and H and the sample:
Moles C:
1.64g CO2 * (1mol / 44g) = 0.03727 moles CO2 * (1mol C / 1mol CO2) = 0.03727 moles C
0.03727 moles C * (12g / mol) = 0.4473g C
Moles H:
1.01g H2O * (1mol / 18g) = 0.05611 moles H2O * (2mol H / 1mol H2O) =
0.1122 moles H
0.1122 moles H * (1g / mol) = 0.1122g H
Moles O:
0.860g - 0.1122g H - 0.4473g C = 0.3005g O * (1mol / 16g) =
0.01878 moles O
The ratio of the moles of atoms regard to the moles of O (Lower number of moles) is:
C = 0.03727 moles C / 0.01878 moles O = 1.98 ≈ 2
H = 0.1122 moles H / 0.01878 moles O = 5.97 ≈ 6
O = 0.01878 moles O / 0.01878 moles O = 1
Empirical formula is:
C₂H₆ODetermine the mass of NaCl needed to create a 500. ml solution with a concentration of 1.50 M.
Is this an alpha or beta decay?
An electric current is produced when ______________________ move continuously batteries magnets electric charges wires
Answer:
electric charges.
Explanation:
Conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction.
An electron can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.
An electric current is produced when electric charges (electrons) move continuously and it's measured in Amperes through the use of an ammeter.
Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.
Mathematically, Ohm's law is given by the formula;
[tex] V = IR[/tex]
Where;
V represents voltage measured in voltage.
I represents current measured in amperes.
R represents resistance measured in ohms.
please look at the attached photo
What volume (in mL) of 0.415M silver nitrate will be required to precipitate as silver bromide, all bromide ions in 35.0 mL of 0.064M of calcium bromide?
2AgNO3(aq) + CaBr2(aq) → 2AgBr(s) + Ca(NO3)2(aq)
a
3.04 mL
b
10.8 mL
c
21.6 mL
d
43.2 mL
Answer:
im pretty sure its d
Explanation:
The volume (in mL) of 0.415M silver nitrate will be required to precipitate as silver bromide is 10.8ml , option B is the correct answer.
What is Molarity ?
Molarity is defined as the amount of solute (in moles)in per litre of solution.
It is also known as molar concentration of a solution , It is expressed in mol/l .
[tex]\rm M=\dfrac{n}{V}[/tex]
where n is the number of moles
and V is the volume in litres.
We can rearrange this equation to get the number of moles:
n= M * V
The molarity of calcium bromide is 0.064 M and the volume given is 35 ml,
the moles will be n = 0.064 * 35 = 2.24 moles
2AgNO₃(aq) + CaBr₂(aq) → 2AgBr(s) + Ca(NO₃)₂(aq)
From the reaction we can see that for every 1 mole of Calcium Bromide 2 moles of Silver Nitrate is needed , so for 2.24 moles 4.48 moles will be needed.
The molarity is given as 0.415 M and the number of moles is 4.48 so the volume required can be calculated from the above formula
[tex]\rm V=\rm\dfrac{n}{M} \\\\V=\rm\dfrac{4.48}{0.415} \\\\V= 10.8 ml\\[/tex]
Hence the volume (in mL) of 0.415M silver nitrate will be required to precipitate as silver bromide is 10.8ml , option B is the correct answer.
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The rate of gas diffusion is ---Select--- proportional to temperature because a higher temperature means a/an increase in the kinetic energy of molecules. The rate of gas diffusion is ---Select--- proportional to the molecular weight of the gas because gas particles with higher masses require ---Select--- energy to move compared to gas particles with lower masses.
Answer:
The rate of gas diffusion is directly proportional to temperature
Explanation:
The rate of gas diffusion is
a) directly proportional to square root of temperature
b) inversely proportional to the square root of density
c) directly proportional to pressure
d) inversely proportional time and square root of molecular mass
Thus, option A is correct
The half-life of iodine-131 is 8 days. How many milligrams of iodine-131
remain after 24 days if the original amount was 4.00 mg?
A. 1.33 mg
B. 0.667 mg
C. 0.500 mg
D. 0.444 mg
Answer:
The correct answer is - C. 0.500 mg.
Explanation:
In this case, the half-life of the iodine-131 is 8 days and the initial amount is given 4 mg. According to this after every 8 days, half of the initial value of the iodine-131 remains only.
8 days or 1st half-life = A(i)* 1/2
16 days or two half-life = A(i)* 1/4
24 days or three half-life = A(i)* 1/8
and the remaining amount A would be
= A(i)*1/2^n
= 4 * 1/2^3
= 4 *1/8
= 0.500 mg
What is the mass of oxygen in 1 mole of NaHCO3?
Answer:
48.00
Explanation:
3 oxygen (15.99 x 3)= 48
1 An
atom
has 20
number?
with 39
neutron
mass number
it's
atomic
yes it is atomic if the mass number is that high
Increasing temperature makes a
reaction rate faster. Which of the
following best explains the above?
A. high-temperature meltdown
the reactants so it is easier to
react
O
B. High temperature increases
the number of high energy
collisions
C. reactants can evaporate
when they are heated up
D. Products favor higher
temperature reactants.
Answer:
High temperature increases the number of high energy collisions
Explanation:
Increasing the temperature a reaction takes place at increases the rate of reaction. At higher temperatures, particles can collide more often and with more energy, which makes the reaction take place more quickly.
conclusion on friendship
Explanation:
Conclusion. A good friendship is very difficult to come across. That is why we should appreciate this divine relationship that is based on understanding and feelings. ... A true friend is one of the most precious possessions that one can have in his life.Hope it's helpful for Yuh bro!!
Answer:
Friendship is, in many respects, a "comfortable" love relationship. Friendships involve as little or as much intimacy as the partners are inclined to express at any given time. Friends are not normally obligated to exchange benefits, but do so in ways that are often so natural as to be unwitting. The ties that bind them are by unfettered mutual consent. In spite of its being so comfortable, in fact because of it, friendship contributes in unique ways .
1 mole of hydrochloric acid reacts with 1 mole of sodium hydroxide to give _______ g of sodium chloride.
Answer:
58,5
Explanation:
Can the excess reactant control the percentage yield?
Please answer
Answer:
Yes, it can.
Explanation:
The percentage yield is decreased if the reactants do not completely form the products. To make a given mass of product, a process with a low percentage yield requires more of the reactants than a process with high percentage yield.
Select all examples that apply as a physical changes in properties (please help)
a dry cell produces_______ electricity.
A) static
B) current
Answer:
dude! it's static!
Explanation:
a dry cell can't function and is therefore static!
what is ionic compounds??
Answer:
The ionic compounds are chemical compounds composed of ions, which is held together by electrostatic forces termed ionic bonding.
What happens when the limiting reactant of a reaction runs out?
O excess reactants begin combining.
O reaction stops
O reaction slows down.
O reaction speeds up.
hellppp i have a quiz please
hindi ko po maintindihan
When calcium metal is placed in water a vigorous single replacement rection occurs, releasing hydrogen gas. What will happen to the pH of the solution that forms as this chemical reaction proceeds
Answer:
The pH of the solution increases
Explanation:
One of the properties of metals is that they react with water to yield hydrogen gas and the hydroxide of the metal.
Calcium is a metal in group two of the periodic table and also undergoes such reaction.
The equation of the reaction is;
Ca(s) + 2H2O(l) -----> Ca(OH)2(aq) + H2(g)
Since Ca(OH)2 is alkaline, the pH of the solution increases.
Identify the correct formula for each of the following acids. Click here to use the common polyatomic ion sheet if needed.
Hydrochloric acid
HClO2
HClO3
HCl
Answer:
HCl
H3PO4
Explanation:
The formula of hydrochloric acid is HCl. It contains one hydrogen and one chlorine atom. And thus all other options with O is wrong and option C is correct.
What is hydrochloric acid?
Hydrochloric acid is a strong acid having the formula HCl. Thus one mole of hydrochloric acid contains one hydrogen atom and one chlorine atom. No other elements such as oxygen is present in it.
The electronegativity of chlorine is very higher compared to hydrogen and they attracts by hydrogen bond. Each atom shares one electron with the other atom and thus it can also said as they are covalently bonded.
Hydrochloric acid is used in many industrial uses and it is present even in our stomach to aid digestion. Since it is very strong acid it may cause sever damages to skin if and its vapor causes respiratory issues when comes in contact.
Therefore, the correct formula of hydrochloric acid is HCl, option C is correct.
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Which of the following is a correct statement about water? (3 points)
Hydrogen bonding causes water to be strongly cohesive.
Hydrogen bonding causes water to have a low surface tension.
Water is a universal solvent because polar and nonpolar solutes can dissolve in it.
Water is less dense as a liquid than as a solid because of changes in bond structure.
Answer:
A: Hydrogen bonding causes water to be strongly cohesive.
Explanation:
Water has a high surafce tension. Hence droplets of water
Water cannot dissolve non polar substances like oil; only polar
Water is actually less dense in solid form :)
Hydrogen bonding causes water to be strongly cohesive.
This sticking together of like substances is called cohesion. Depending on how attracted molecules of the same substance are to one another, the substance will be more or less cohesive. Hydrogen bonds cause water to be exceptionally attracted to each other. Therefore, water is very cohesive.
Cohesion
Cohesion, also called cohesive attraction or cohesive force, is the action or property of like molecules sticking together, being mutually attractive. It is an intrinsic property of a substance that is caused by the shape and structure of its molecules, which makes the distribution of surrounding electrons irregular when molecules get close to one another, creating an electrical attraction that can maintain a microscopic structure such as a water drop. In other words, cohesion allows for surface tension, creating a "solid-like" state upon which light-weight or low-density materials can be placed.
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what physical and social systems are involved in the service industry
Answer:
Hey mate.....
Explanation:
This is ur answer........
For example, the communications industry includes all of the physical and social systems that produce books, newspapers, magazines, radio and television broadcasts, billboard advertisements, Internet websites, telephones, and telecommunications, such as the GPS.
Hope it helps!
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What is the volume of NaOH used in each Titration??
Answer:
Titration 1=33.9ml
Titration 2=33.45ml
Titration 3=33.35ml
Explanation:
Volume of NaOH used =Final reading - Initial reading
Titration 1:
Final reading =35.5ml
Initial reading=0.6ml
Volume of NaOH used =34.5ml -0.6ml=33.9ml
Titration 2:
Final reading =34.3ml
Initial reading=0.85ml
Volume of NaOH used =34.3ml -0.85ml=33.45ml
Titration 3:
Final reading =33.8ml
Initial reading=0.45ml
Volume of NaOH used =33.8ml 0.45ml=33.35ml
Hope it helps:)
Tipo de enlace en los compuestos. Compuesto /Electronegatividad Elemento 1/Electronegatividad Elemento 2/ Diferencia de electronegatividad (resta) Tipo de enlace CO2 KCl H2O
Answer:
Tipo de enlace enlace en CO2 - Covalente
Tipo de enlace enlace en KCl - iónico
Tipo de enlace enlace en H2O: enlaces covalentes y de hidrógeno
Electronegatividad de CO2 - Diferencia en electronegatividad de carbono (EN = 2.5) y oxígeno (EN = 3.5) = 3.5 - 2.5 = 1
Diferencia en electronegatividad de KCl = 3,2 -0,8 = 2,4
Diferencia en electronegatividad de H2O = 3.5 -2.1 = 1.4
Explanation:
Tipo de enlace enlace en CO2 - Covalente
Tipo de enlace enlace en KCl - iónico
Tipo de enlace enlace en H2O: enlaces covalentes y de hidrógeno
Electronegatividad de CO2 - Diferencia en electronegatividad de carbono (EN = 2.5) y oxígeno (EN = 3.5) = 3.5 - 2.5 = 1
Diferencia en electronegatividad de KCl = 3,2 -0,8 = 2,4
Diferencia en electronegatividad de H2O = 3.5 -2.1 = 1.4
How many joules of heat is needed to heat 68.00 grams of aluminum foil from 55.00 °C to 93.00 °C if aluminum has a specific heat of 0.90 J/g °C? 2871 J 9058 J 2326 J 3420 J
Answer:
2326 J
Explanation:
93-55
You get the temperature increased.
Then the answer (x)
Mass *(x) *specific heat
how do valence electrons interact between non polar covalent, polar covalent, and ionic bonds?
Answer:
In non-polar covalent bonds, the electrons are equally shared between the two atoms. For atoms with differing electronegativity, the bond will be a polar covalent interaction, where the electrons will not be shared equally.
Explanation:
i did some reasherch so there^^
Which layer of the earth is the thinnest and thickest?
Answer:
crust
Discuss with the whole class what the relative thicknesses of the layers are — that the inner core and outer core together form the thickest layer of the Earth and that the crust is by far the thinnest layer.
Explanation:
Discuss with the whole class what the relative thicknesses of the layers are — that the inner core and outer core together form the thickest layer of the Earth and that the crust is by far the thinnest layer.
in which statement are the particles close together and slowly moving past each other
Answer
A-air
B-ice
C-steam
D-water
Answer:
Water particles are close together and move slowly past each other
organs are directly made up of what lower level of cellular organization
Answer:
hwejfhwefefewf
Explanation:
efwffhhfghr