7th Grade Physical Science Review

Which subatomic particle has a positive charge and is found in the nucleus of an atom?

• Electron

• Neutron

• Proton

• Ion

What happens to the state of matter when thermal energy increases?

• Particles move more slowly

• Particles move more rapidly

• Particles stop moving

• Particles maintain constant speed

Tags

NGSS.MS-PS1-4

Which of the following is a pure substance?

• Salt water

• Air

• Oxygen gas

• Soil

During a chemical reaction, what is conserved?

• Temperature only

• Mass of all reactants and products

• Volume of the container

• Color of the substances

Tags

NGSS.MS-PS1-5

What determines an element's atomic number?

• Number of neutrons

• Number of electrons

• Number of protons

• Combined number of protons and neutrons

In the periodic table, elements in the same group (vertical column) share what characteristic?

• Same atomic mass

• Same number of neutrons

• Same number of electron shells

• Same number of outer level (valence) electrons

When pressure increases on a gas at constant temperature, what happens to its volume?

• Increases

• Decreases

• Stays the same

• Becomes zero

Which represents a molecule of an element?

• H₂O

• NaCl

• O₂

• CO₂

Tags

NGSS.MS-PS1-1

What type of mixture has particles that are large enough to be seen and filtered out?

• Solution

• Suspension

• Pure substance

• Colloid

During a phase change from liquid to gas, what happens to the temperature?

• Increases rapidly

• Decreases rapidly

• Remains constant

• Fluctuates randomly

Tags

NGSS.MS-PS1-4