Midterm Review 1/3

Front

Nuclear reactions in the core of a star convert ___ to helium.

Back

Hydrogen is converted to helium in the core of a star through nuclear fusion.

Front

Any massive system of hundreds of billions of stars held together by gravity.

Back

A galaxy is a massive system of stars, gas, dust, and dark matter held together by gravity.

Front

Write 564,000,000 in scientific notation.

Back

5.64 x 10^8 is the scientific notation for 564,000,000.

Front

A process of inquiry that results in the accumulation of knowledge.

Back

The scientific method is a systematic process used to investigate phenomena, acquire new knowledge, or correct and integrate previous knowledge.

Front

A fair test designed to give a reliable and unbiased answer to the question being investigated.

Back

An experiment is a controlled procedure carried out to discover, test, or demonstrate a fact or general truth.

Front

The smallest unit of an element that retains the properties of that element.

Back

An atom is the basic unit of a chemical element.

Front

A substance made of two or more different types of atoms bonded together.

Back

A compound is a chemical substance formed from two or more elements in a fixed ratio.

Front

The force of attraction between two objects due to their mass.

Back

Gravity is the force that attracts two bodies towards each other.

Front

The change in position of an object over time.

Back

Motion is the process of changing position.

Front

The amount of matter in an object, typically measured in grams or kilograms.

Back

Mass is a measure of the amount of matter in an object.