A substance that speeds up the rate of a chemical reaction is calleda. a catalyst.
b. a lipid.
c. a molecule.
d. an element.

Answers

Answer 1

Answer: I'm not going toblie I'm stuck with A and B.But to me my gut says A

Answer 2

Answer: A substance that speeds up the rate of a chemical reaction is called a catalyst. As a catalyst speeds up the reaction, as an enzyme does.

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At sea level, where the pressure was 104 kPa and temperature 21.1 ºC, a certain mass of air occupies 2.0 m3 . To what volume will the region expand when it has risen to altitude where the pressure and temperature are (a) 52 kPa, -5.0 ºC ( True or False )
A graduate student working toward a PhD in Chemistry discovers an efficient, powerful redox reaction involving an uncommon combination of chemicals. In order to show other chemists the voltage generated by the reaction, the student would most likely record information in
What is heat?(in scientific vocab)
Ionic bonds generally form when the bonded elements have a difference in electronegativity greater than 1.5 to 1.7. Subtract the electronegativities for the following pairs of elements and predict whether they form ionic bonds.Electronegativity difference of Na and F: yesno
if an unknown mineral has a hardness between 5 and 9, what could you do to the mineral to find out more about its hardness?

What are transferred in an oxidation-reduction reaction

Answers

hydrogen atoms or electrons

Answer:

C. Electrons

Explanation:

Which of the following is true of a heterogeneous mixture?a. Different samples may not be exactly alike.
b. The density is the same throughout the entire mixture.
c. It is not possible to separate the various parts of the mixture.
d. Taking one sample will enable you to determine what it is made of.

Answers

Answer: Option (a) is the correct answer.

Explanation:

A heterogeneous mixture is defined as the mixture in which distribution of solvent particles is uneven throughout the solution.

For example, a mixture of sand and water is a heterogeneous mixture.

So, when we take different samples for the same heterogeneous mixture then there will be different composition of solute particles in each of them.

On the other hand, in a homogeneous solution there will be even distribution of solute particles into the solvent. Each sample of a homogeneous mixture will contain same composition of solute particles.

Thus, we can conclude that the statement different samples may not be exactly alike, is true of a heterogeneous mixture.

A, a heterogeneous mixture is a mixture where all the particles are not made up of one uniform composition. you can distinguish the different particles

Fe2O3 + H2 --> Fe + H2OA) what mass of hydrogen gas must be consumed to produe 10.0 g of iron metal?

B) what mass of iron(lll) oxide, Fe2O3, must be consumed to prepare 2.50g of iron metal

Answers

A) 10.0g of Iron is $(10.0)/(55.8)=179mmol$ of Iron.

One mole of dihydrogen is required to form one mole of iron, hence you'll need $0.179*1.00=0.179g$ of dihydrogen.

B) Likewise : 2.50g of Iron is $(2.50)/(55.8)=44.8mmol$ of Iron, hence we'll need $44.8*(3*16+2*55.8)=7.15g$ of Fe2O3.

Remember it!Determine the statement that accurately explains the
endothermic and exothermic reactions.
4
O Endothermic reactions absorb heat
energy while exothermic reactions
release heat energy.
O Exothermic reactions absorb heat
energy while endothermic reactions
release heat energy.
O Endothermic and exothermic reactions
absorb thermal energy.
O Endothermic and exothermic reactions
release thermal energy.
REM
The prefix exo-
applied to a che
mean energy
re

Answers

Statement-1 is the correct answer that is Endothermic reactions absorb heat energy while exothermic reactions release heat energy.

How can we distinguish between exothermic and endothermic processes?

Chemical reactions that release energy are referred to as exothermic. More energy is produced than is needed to break the bonds between the reactants when bonds are formed in the byproducts of exothermic processes.

Chemical processes that either use or absorb energy are referred to as endothermic. In endothermic reactions, more energy is absorbed when bonds in the reactants are broken than is released when new bonds are formed in the products. Since an isothermic chemical reaction uses exactly as much energy as it produces, there is no net energy change.

Therefore, the first statement is the right response.

To know more about exothermic, check out:

brainly.com/question/2924714

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During which change of state would the volume of a substance increase the most? 1.deposition 2.melting 3.vaporization 4.sublimation

Answers

The answer is:

Sublimation

The explanation:

The most state has the high volume is the gas state.

So here the answer is between vaporization and sublimation???

and when the sublimation is: the change of the material from the solid state to the gas state directly without pass to liquid state from the solid first then to the gas

and the vaporization is : The change of the material from the liquid state to the gas state by heating Ex: water vaporize at 100°

here, the answer is sublimation because the difference of volume which resulted from this process is more than the volume resulted from vaporization.

Answer: The correct answer is Option 4.

Explanation:

All these processes are the physical processes which occurs between the phases of matter.

Solid state is the phase where particles are closely arranged and the volume of this state is less.

Liquid state is the phase where particles are not closely arranged and the volume of this state is more than solid but less than gaseous state.

Gaseous state is the phase where particles are loosely arranged and this state has the largest volume.

Deposition is the physical process in which gaseous state is converted to solid state. The volume of the substance decreases.

Melting is the the physical process in which solid state is converted to liquid state. The volume of the substance increases.

Vaporization is the physical process in which liquid state is converted to gaseous state. The volume of the substance increases.

Sublimation is a physical process in which solid states is converted to gaseous state. The volume of the substance increases and in this case, the increment in volume is the maximum.

Hence, the correct answer is Option 4.

The half-life for the process 238u→206pb is 4.5×109 yr. a mineral sample contains 61.0 mg of 238u and 15.5 mg of 206pb. part a what is the age of the mineral