Practice EOC

Earth has a mass of 5.97 x 10²⁴ kg and Earth's moon has a mass of 7.35 x 10²² kg. The distance between the center of Earth and the moon is 3.84 x 10⁸ m. Which represents the gravitational force of attraction between Earth and the moon?

• 1.98 x 10²⁰

• 3.81 x 10²⁰

• 7.62 x 10²⁸

• 2.97 x 10³⁰

The balanced chemical equation for the synthesis of water is shown. Which statement explains how mass/matter is conserved in this reaction?

• the number of molecules is the same on both sides of the equation

• the number of atoms of each element is the same on both sides of the equation

• mass/matter is NOT conserved in this equation

• the number of coefficients is the same on both sides of the equation

Tags

NGSS.MS-PS1-5

A 10 kg cart with a momentum of 10 kg ∘ m/s hits a 20 kg cart at rest. Momentum is calculated by using the formula p = mv, where m is the mass of an object and v is the velocity of an object. What is the momentum of the system after the collision?

• 2 kg ∘ m/s

• 10 kg ∘ m/s

• 20 kg ∘ m/s

• 30 kg ∘ m/s

Tags

NGSS.MS-PS2-1

Which model shows electric field lines surrounding a positively charged object?

• A

• B

• C

• D

Tags

NGSS.MS-PS2-3

A 4 kg object is traveling to the right at a constant velocity of 16 m/s across a surface. The formula for momentum is p = mv, where "m" is mass and "v" is velocity. Calculate the momentum if the mass of the object (4kg) was held constant but the velocity was half as much (8 m/s). Enter your number only - the units are kg ∘ m/s.

Sodium chloride, commonly known as table salt, is made of sodium (Na) and chloride (Cl) ions. Which of the following is the simplest formula unit for sodium chloride?

• NaCl

• Na₂Cl

• NaCl₂

• Na₃Cl₂

Tags

NGSS.MS-PS1-1

• 22 m/s

• 175 m/s

• 490 m/s

• 30,625 m/s

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

NGSS.MS-PS3-5

Which factors could increase reaction rate? Select all that apply.

• introducing an inhibitor

• increasing the temperature of the system

• increasing the surface area of a solid reactant

• increasing the concentration of one of the reactants

• increasing the size of the container in which the reaction occurs

Tags

NGSS.HS-PS1-5

Which of the following objects have balanced forces acting upon them? Select all that apply.

• one at rest on a table

• one that is accelerating

• one that is rolling to a stop

• one that is falling after being dropped

• one moving to the right at a constant velocity

The diagram shows two negatively charged particles separated by a distance. The two charges...

• repel one another

• are attracted to one another

• are not affected by one another

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5