Explain what happens to substances during a chemical change

2 answers:

8 0

In a chemical change, the atoms in the reactants rearrange themselves and bond together differently to form one or more new products with different characteristics than the reactants. When a new substance is formed, the change is called a chemical change.

icang [17]3 years ago

6 0

Answer:

A chemical change is when substances react chemically to make a product with a different identity than the reactants. The different identity is due to the rearrangement of the atoms in the reaction.

Explanation:

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How many moles of NaCl are present in 2.50 L of a 0.070 M solution?

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Given :

Volume of NaCl solution 2.5 L .

Molarity of NaCl solution is 0.070 M .

To Find :

How many moles are present in the solution.

Solution :

Let, n be the number of moles.

We know, molarity is given by :