Which correctly identifies the mass and approximate weight of the same object on Earth? (use 10 m/s² for Earth's gravitational acceleration)

• 20 kg mass, 20,000 g weight

• 20 kg mass, 200 N weight

• 20 N mass, 2 kg weight

• 20 N mass, 200 kg weight

A boy is bouncing a ball straight up into the air with a tennis racket. As the ball is rising, how is the ball affected by gravity?

• Gravity causes the ball to increase its upward speed

• Gravity causes the speed of the ball to stay the same

• Gravity causes the ball to accelerate downward

• Gravity causes the ball to accelerate upward

Tags

NGSS.MS-PS2-4

Which of the following is most likely a pure substance?

• a smooth cake batter

• a glass of water that tastes salty

• a dark gray solid that has a definite chemical composition

• a sample of air captured from the atmosphere

A chocolate chip cookie has large chunks of chocolate chips. From this observation, the cookie could best be classified as

• a compound

• a homogeneous mixture

• an element

• a heterogeneous mixture

The symbol for the element copper is

• C

• Co

• CO

• Cu

Which subatomic particle has no net charge and is found within the nucleus?

• electron

• neutron

• proton

• cation

How many neutrons are found in an atom of Radon-226?

• 86

• 140

• 226

• 312

Tags

NGSS.HS-PS1-8

What is the name of the compound formed in the chemical reaction shown below? 2 Na + Cl2 --> 2 NaCl

• sodium monochloride

• sodium chloride

• disodium monochloride

• nitrogen chloride

Tags

NGSS.MS-PS1-1

Which solution is most acidic?

• cranapple juice, pH = 5.0

• salad dressing, pH = 4.5

• pickle juice, pH = 3.0

• lye water, pH 10.0

The pH of several solutions is listed. Refer to the pH table provided. Which solution is the most basic?

• 1

• 2

• 3

• 4