Pass Science

This is the periodic entry for the element Boron. What is the atomic mass of Boron?

• 5

• 10.81

• 13

• 15.81

Which of these parts of an atom has a negative charge?

• electron

• proton

• neutron

• nucleus

Which part of the atom has a positive charge?

• electron

• proton

• neutron

• nucleus

Where are electrons found in an atom?

• inside protons

• in the nucleus

• orbiting the nucleus

• covering the surface of protons

What element is represented in this model?

• Lithium

• Beryllium

• Sodium

• Nitrogen

Tags

NGSS.MS-PS1-1

The Law of Conservation of Mass states-

• That in order to conserve mass we should always recycle our waste.

• That conservation efforts are the only way to preserve the mass that exists in natural habitats.

• That the mass in chemical reactions can not be created nor destroyed, just rearranged.

• That you should use only the minimum amount of chemicals necessary in a chemical reaction in order to conserve your supply of that chemical.

Tags

NGSS.MS-PS1-5

Which of the following is an example of a new substance being formed by a chemical reaction?

• milk souring

• water evaporating

• iron bending

• helium-filled balloon floating

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A student creates a mixture of water and washing soda weighing 10 g and a mixture of water and epsom salts weighing 15 grams. He knows that when he mixes the two substances a chemical change will occur. According to the law of conservation of mass, what should the weight of the products be after he mixes them?

• 10 g

• 15 g

• 5 g

• 25 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A racecar accelerates at a rate 19 m/s/s. If the mass of the race car is 1600 kg, determine the net force acting on the car.

• 30,400 N

• 8,400 N

• 300 N

• 84 N

Tags

NGSS.MS-PS2-2

When an object is acted on by unbalanced forces, the object will -

• continue in the same direction

• continue at the same speed

• accelerate

• come to a stop

Tags

NGSS.MS-PS2-2