7th Grade Science REVIEW

Matter

100

Define matter.

Anything that has mass and takes up space.

200

Name 4 states of matter.

Solid, liquid, gas, and plasma.

300

What is the difference between solid, liquid, and gas?

All of these work.

• Solid: Has a definite shape and volume, and its particles are closely packed together. 
• Liquid: Has a definite volume but takes the shape of its container, and its particles are less tightly packed than in solids. 
• Gas: Has no definite shape or volume and takes the shape and volume of its container, with particles moving freely. 

400

Give at least 3 examples of a matter changing states.

Choose 3-4 from any of these 4.

- Ice (solid) to water (liquid)

- Water (liquid) to steam (gas)

- Steam (gas) to water (liquid)

- Water (liquid) to ice (solid)

500

What are some examples of physical properties of matter? Name 6.

Physical properties include color, shape, size, state of matter, density, and melting point.

Energy

100

What is the definition of energy?

The ability to do work.

200

Difference between KE and PE.

KE is moving energy, while PE is stored energy.

300

What type of energy is stored in a battery?

Chemical Energy

400

What happens to the energy when a light bulb is turned on?

The energy is converted to heat and light.

500

How can we measure the amount of energy in a system? What units are used to measure energy?

- By combining the energy contributions from its internal, kinetic, and potential components.

- Joule (J)

Forces

100

Name 5 forces.

Gravitational, Magnetic, Air Resistance, Electrostatic, and Friction.

200

A car is accelerating down a hill. What forces are acting on the car?

Gravity, Air Resistance, and Friction.

300

Contact or Non-contact

Magnetic - _____

Gravitational - _____

Friction - _____

Air Resistance - ______

Electrostatic - ______

Magnetic - Non-contact

Gravitational - Non-contact

Friction - Contact

Air Resistance - Contact

Electrostatic - Non-contact

400

How does the shape of an object affect its air resistance?

Generally, streamlined shapes experience less air resistance compared to blunt shapes. A streamlined object, like a teardrop or bullet, allows air to flow smoothly over its surface, minimizing friction and reducing drag. Blunt shapes, like a flat plate, create turbulence and higher drag due to air being forced to separate from the object's surface.

500

Does the mass of an object affect its acceleration when a force is applied? Why or why not?

Yes, the mass of an object directly affects its acceleration when a force is applied, according to Newton's second law of motion. The relationship is described by the equation F = ma, where F is the net force, m is the mass, and a is the acceleration.

Vocabulary

100

Define Newton.

A unit scientist use to measure force.

200

Defin Velocity.

Is the speed of an object in a particular direction.

300

Define Inertia.

The tendency of objects to resist any change in motion.

400

Define amplitude.

A measure of how far a particle in the medium moves away from its normal rest position.

500

Define work.

The transfer of energy to an object by a force that causes the object to move in the direction of that force.

Potluck

100

How many of each atom are there in this molecule?

H₂SO₃

H (hydrogen) - ____

S (sulfur) - ____

O (oxygen) - ____

H (hydrogen) - 2

S (sulfur) - 1

O (oxygen) - 3

200

Give 2 examples of chemical properties.

Burn and Rust.

300

A substance that contains only one type of particle is called ______________.

Pure Substance

400

What do you have to do to change a liquid to a solid?

1. Bring its temperature above its boiling point.

2. Bring its temperature below its melting point.

3. Bring its temperature below its boiling point.

2. Bring liquid below melting point

500

Name Newton's 3 laws of motion.

- Newton's First Law (Law of Inertia): An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by a force. This means objects resist changes to their state of motion.
- Newton's Second Law (Law of Force): The force acting on an object is equal to the mass of the object multiplied by its acceleration (F = ma). This law explains how force affects the motion of an object.
- Newton's Third Law (Law of Action and Reaction): For every action, there is an equal and opposite reaction. This means that when one object exerts a force on another, the second object exerts an equal and opposite force back on the first.