Midterm Chemistry 2024-2025- Mrs. Chacon

Front

What is the main job of engineers?

Back

Solving problems.

Front

What happens when baking soda and vinegar combine?

Back

They undergo a chemical change to produce carbon dioxide.

Front

How do you calculate the mass number of an atom?

Back

Mass number = Number of protons + Number of neutrons.

Front

What is the density of an object if its mass is 1g and its volume is 2cm³?

Back

Density = Mass/Volume = 1g/2cm³ = 0.5 g/cm³.

Front

What is the mass number of an atom with 20 protons, 19 electrons, and 18 neutrons?

Back

Mass number = 20 protons + 18 neutrons = 38.

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances.

Front

What is a physical change?

Back

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

Front

What is the role of neutrons in an atom?

Back

Neutrons contribute to the mass of the atom and help stabilize the nucleus.

Front

What is the difference between protons and electrons?

Back

Protons are positively charged particles found in the nucleus, while electrons are negatively charged particles that orbit the nucleus.

Front

How do you find the number of neutrons in an atom?

Back

Number of neutrons = Mass number - Number of protons.