8th Grade Science Review

Front

What is the atomic number of sodium?

Back

11 (Sodium has 11 protons in its nucleus).

Front

What is the chemical reactivity of sodium?

Back

Sodium is highly reactive due to its one valence electron.

Tags

NGSS.MS-PS1-2

Front

What type of wave has a frequency of 10^22 Hz?

Back

Gamma Rays.

Tags

NGSS.HS-PS4-1

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NGSS.HS-PS4-4

Front

What is the formula to calculate acceleration?

Back

Acceleration = Force / Mass.

Tags

NGSS.MS-PS2-2

Front

If a magnet exerts a force of 4N on a 0.04 kg ball bearing, what is the acceleration?

Back

100 m/s².

Tags

NGSS.MS-PS2-2

Front

What are noble gases?

Back

Noble gases are elements in Group 18 of the periodic table that are stable and do not react with other elements.

Front

What is the chemical formula for potassium nitrate?

Back

KNO3.

Front

How many total atoms are in one unit of potassium nitrate (KNO3)?

Back

5 (1 Potassium, 1 Nitrogen, 3 Oxygen).

Tags

NGSS.MS-PS1-1

Front

What is the significance of valence electrons in chemical reactivity?

Back

Valence electrons determine how an element reacts with others; elements with fewer valence electrons tend to be more reactive.

Front

What are gamma rays?

Back

Gamma rays are high-frequency electromagnetic waves with very short wavelengths.

Tags

NGSS.HS-PS4-1

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