7th Grade Mid-term Exam Review

This set of flashcards covers key concepts and vocabulary from the 7th grade mid-term exam review including forces, chemistry, and changes in matter.

What unit is used to measure forces?

Newtons

Who is credited for the laws of motion?

Newton

Which two things lead to greater inertia?

Mass and speed

What is a practical example of inertia?

Water spilling when you brake.

What are balanced forces?

Forces that are equal in size and opposite in direction.

What are unbalanced forces?

Forces that are not equal, leading to a change in motion.

How do we calculate net forces?

By calculating all forces together.

What two characteristics do forces have as vectors?

Magnitude and direction.

An object moving at a constant speed experiences which type of force?

Balanced forces.

What is the smallest unit of an element?

Atom.

What is a pure substance that cannot be broken down into simpler substances?

Element.

What is a compound?

Two or more different elements combined.

What does a chemical formula represent?

The number and types of atoms in a substance.

What particles are protons and neutrons?

Subatomic particles.

What charge does a proton have?

Positive charge.

What charge does a neutron have?

No charge.

What charge does an electron have?

Negative charge.

How does a chemical symbol begin?

With a capital letter.

What can a total chemical formula tell us?

The number of atoms and types of elements present.

What is chromatography?

A lab technique that separates mixtures into their components.

What is a chemical change?

A change that is not reversible.

What is a physical change?

A change that does not alter the chemical composition.

What are reactants in a chemical reaction?

The starting substances before the reaction occurs.

What are products in a chemical reaction?

The result after reactants undergo a change.

What is mass?

The amount of matter in an object.

What does a saturated solution mean?

A solution that holds the maximum amount of dissolved solute.