mid term review part 1

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

True or False: A physical change may produce a new substance.

Back

False

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances.

Front

How do you balance a chemical equation?

Back

To balance a chemical equation, you adjust the coefficients of the reactants and products to ensure that the number of atoms for each element is the same on both sides.

Front

How many HCl molecules are needed to balance the equation: Mg + __HCl -> MgCl2 + H2?

Back

2

Front

What is the chemical formula for sucrose?

Back

C12H22O11

Front

In the chemical formula C12H22O11, how many C atoms are there?

Back

12

Front

What is potential energy?

Back

Potential energy is the energy stored in an object due to its position or arrangement.

Front

At which point is potential energy the greatest in a given system?

Back

It is typically greatest at the highest point in a system, such as point W in a diagram.

Front

What happens to atoms after a chemical change?

Back

They link up in different ways.