STAAR Review #1 8th Grade

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

How many protons does an element with an atomic number of 20 have?

Back

20 protons.

Front

What is the charge of an electron?

Back

Electrons have a negative charge.

Front

How many electrons does a neutral atom have if it has 26 protons?

Back

26 electrons.

Front

What is a vacuole?

Back

A vacuole is a storage organelle in a cell that can hold food, water, or waste.

Front

What happens to stars as you move left on the Hertzsprung-Russell diagram?

Back

Stars get hotter.

Front

What is plate tectonics?

Back

Plate tectonics is the theory that explains the movement of Earth's plates and how they shape the Earth's surface.

Front

What occurs when two continental plates collide?

Back

They can form mountains and cause earthquakes.

Front

What is subduction?

Back

Subduction is the process where one tectonic plate moves under another plate and sinks into the mantle.

Front

What is the role of ribosomes in a cell?

Back

Ribosomes are responsible for protein synthesis.