How does a catalyst work in speeding up a reaction?

By lowering the activation energy or reaction

What does NOT happen when the temperature is increased?

More particles collide in the correct orientation

Particles collide with more energy

Why does a higher concentration increase the rate of reaction?

it increases the frequency of particle collisions

it increases the amount of reactants

it lowers the activation energy

it increases the energy of particle collisions

What is the rate of reaction?

How much gas a reaction produces

Cutting a tree limb into logs is (a)____________ and burning them in the fireplace is (b)____________.

(a) A Physical Change (b) A Chemical Change

(a) A Physical Change (b) Also a Physical Change

(a) A Chemical Change (b) Also a Chemical Change

(a) A Chemical Change (b) A Physical Change

Which lab experiments below describe a situation where a chemical change has occurred? Check all that apply.

After adding zinc (Zn) to hydrochloric acid (HCl), a student observes bubbles forming in the solution and a thermometer registers a $$10\degree$$ change in temperature.

After combining Unknown A (a solid, white crystal) with Unknown B (a clear, odorless liquid), there is a strong smell produced and a thermometer registers a $$15\degree$$ change in temperature.

A student uses a mortar and pestle (a grinding stone) to break up large pieces of ammonium thiocyanate ( $$NH_4SCN$$ ) into smaller pieces.

A student dissolves sugar ( $$C_6H_6O_6$$ ) into water ( $$H_2O$$ ). The sugar crystals seem to disappear.

The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?

Red, because the activation energy is larger

Blue, because the activation energy is lower

both reaction progress at the same rate

What is the law of conservation of mass?

The law states that mass is neither created nor destroyed in a chemical reaction; it remains constant.

The law states that mass can be created in a chemical reaction.

The law states that mass can be destroyed but not created.

The law states that mass changes form but is not conserved.

Properties & Changes, Factors affecting chemical reactions

Authored by Yesenia Colon Irizarry

Science

8th Grade

NGSS covered

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Properties & Changes, Factors affecting chemical reactions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What kind of properties can only be observed when a substance changes into a different substance?

physical properties

chemical properties

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Properties that can be observed without changing the identity of the substance.

Physical

Chemical

Tags

NGSS.5-PS1-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Example for physical property

odor

burns in air

reacts with water to create hydrogen gas

rust

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Which of the following is a sign that a chemical reaction has occurred?

change in shape

melting

formation of a gas

dissolving

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Which of the following is NOT an example of a physical change?

crumpled paper

pencil sharpening

shrunken clothing

rust

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Change in density is a physical change.

True

False

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

Flammability is an example of what property?

Chemical property

Physical property

Tags

NGSS.MS-PS1-2

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Properties & Changes, Factors affecting chemical reactions

What kind of properties can only be observed when a substance changes into a different substance?

Properties that can be observed without changing the identity of the substance.

Example for physical property

Which of the following is a sign that a chemical reaction has occurred?

Which of the following is NOT an example of a physical change?

Change in density is a physical change.

Flammability is an example of what property?

An ice cream cone melts in a kid's hand while walking outside on a hot summer day. What is this an example of?

A silver ring gets tarnished (becomes dull) as a result of being exposed to air and moisture. What is this an example of?

Water boils at 100˚C. What is this an example of?

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