First Semester Science (7th)

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances, often accompanied by energy changes, color changes, or the production of gas.

Front

What happens to a peeled banana when it turns black?

Back

It undergoes a chemical change.

Front

What is potential energy?

Back

Potential energy is the stored energy in an object due to its position or state, which can be converted into kinetic energy.

Front

What is the role of thermal energy in changing states of matter?

Back

Thermal energy is the energy that determines the temperature of an object and can cause changes in the state of matter when added or removed.

Front

What is magma?

Back

Magma is the molten material found beneath the Earth's surface from which igneous rocks are formed.

Front

What is the difference between magma and lava?

Back

Magma is found beneath the Earth's surface, while lava is magma that has reached the surface.

Front

What are the states of matter?

Back

The states of matter are solid, liquid, gas, and plasma, each defined by the arrangement and energy of particles.

Front

In which state of matter do particles have very weak attractions?

Back

In a gas, particles have very weak attractions and move freely.

Front

What is the definition of ocean trenches?

Back

Ocean trenches are deep, narrow depressions in the ocean floor formed by tectonic plate movements.

Front

True or False: Ocean trenches are formed along lines where two plates diverge under the water.

Back

False. Ocean trenches are formed where two tectonic plates converge.