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Ipatiy [6.2K]
3 years ago
13

What does chemical reaction mean?

Chemistry
1 answer:
QveST [7]3 years ago
8 0

Answer:

definition of chemical reaction:

Explanation:

a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.

plzz mark brainliast

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Why does density increase with more helium
Anton [14]

Answer:

density increases with more helium because of its molar mass

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2 years ago
How surface area affects the rate of a reaction.
alexandr402 [8]
The smaller the surface area, the faster the rate of reaction will be. Think of ice. A full sized ice cube will take longer to melt than crushed ice. Crushed ice will melt much quicker because there is more surface area exposed. So if the surface area can be increased, so will the rate of reaction.

Hope this helps! :)
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3 years ago
Considering all of the time and effort that is put into creating an online business, It is in a merchant's best interest to
stiv31 [10]

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gb

Explanation:

5 0
2 years ago
The protons account for about half the mass of most elements. Protons are located in the atomic nucleus along with the neutrons
Lady_Fox [76]

Answer:

+1

Explanation:

The electrical charge on protons are positive charges.

Protons are subatomic particles and they carry positive charges on them. In all instances, they are found in the tiny nucleus along with neutrons.

Both protons and neutrons contributes the bulk mass of an atom whereas electrons is negligible and inconsequential to the mass of the atom.

  • Electrons carry negative charges within an atom with a charge of -1
  • Neutrons are uncharged subatomic particles.
  • Protons carry positive charges, +1
7 0
2 years ago
Measurements show that the enthalpy of a mixture of gaseous reactants increases by 215. kJ during a certain chemical reaction, w
Maslowich

Answer:

1. The change in energy is 60KJ or 6.0 × 10^1 KJ

2. Endothermic reaction

Explanation:

The Enthalpy (ΔU) for the mixture is given as 215kJ and the workdone (W) on the mixture is - 155KJ. Hence, the change in the energy (ΔH) ofthe mixture is computed using the equation below:

ΔH = ΔU + w

Where,

ΔH= Change in energy

ΔU= Enthalpy change

W= workdone

Therefore ΔH is:

ΔH= 215 kJ + (-155Kj)

ΔH= 60 KJ

Therefore, the change in energy is 60KJ or 6.0 × 10^1 KJ

The value is positive so it is an endothermic reaction.

An endothermic reaction happens when the energy used to break the bonds in the reactants is higher than the energy given out when bonds are formed in the products. This means that the entire reaction takes in energy, hence there is a temperature decrease in the surroundings. Endothermic reactions cannot happen spontaneously. Work is usually done in order to get these reactions to occur. When endothermic reactions absorb energy, a temperature drop is measured by the reaction.

6 0
3 years ago
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