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Elanso [62]
3 years ago
13

Which statement best describes what happens during a chemical change?

Chemistry
1 answer:
Dima020 [189]3 years ago
5 0

Answer:

Both the identity and the properties of a substance change.

Explanation:

During most chemical reactions, both the identity and the properties of substances changes. The chemical and physical properties of a substance often changes during this kind reaction.

A chemical change has the following properties:

  • A new kind of substance forms.
  • It is always accompanied by energy changes
  • Involves a change in mass of the substance
  • Considerable amount of energy is involved in this reaction.
  • The process is irreversible
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In the balanced redox reaction: 2 cu(s) + s(s) ? cu2s(s), how many electrons are gained or lost by each sulfur atom?
MrRa [10]
2Cu + S = Cu₂S

S⁰ + 2e⁻ = S⁻²
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A sulfur atom gains two electrons.
8 0
4 years ago
Can someone explain the steps for balancing chemical equations in depth?
m_a_m_a [10]

Answer:

Steps explained below

Explanation:

To explain balancing of chemical equations, I will make use of an example equation where Hydrogen and oxygen react to form water.

H2 + O2 = H2O

Now, the equation I've listed above is an unbalanced chemical equation. It can be balanced by the following steps;

Step 1: Identify the elements on both the left Hand side and the right hand side.

In this case;

on the left hand side, we have H and O.

On the right hand side, we have H and I also.

Step 2: Identify the number of atoms of each element on both the left and right hand sides.

On the left, H has 2 atoms and O has 2 atoms.

On the right, H has 2 atoms and O has 1 atom.

Step 3: For the equation to be balanced, the number of atoms of each element on the right and left hand side must be the same.

Thus,

O on the left hand side has 2 atoms but on the right hand side it has 1 atom. Thus, we will multiply O on the right by 2 to balance what we have on the left.

So, we now have;

H2 + O2 = 2H2O

Step 4: Check equation: We now have;

H2 + O2 = 2H2O

Our left hand side remains 2 atoms of H and 2 atoms of O. But on the right, we now have;

2 atoms O and 4 atoms of H.

Which means atoms of H is not balanced with the left side.

Step 5: rebalance equation: To rebalance, we multiply H on the left by 2 to give us 2 × 2 = 4 atoms.

Thus, we now have;

2H2 + O2 = 2H2O

3 0
3 years ago
Read 2 more answers
How to do compare and contrast energies
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2 years ago
Underground pumping of liquids can trigger earthquakes, first by adding ______ and then by reducing ______ along faults.
hichkok12 [17]

Answer:

Adding Stress

Reducing Friction

Hope this Helps!

5 0
3 years ago
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