Chemical Reactions

Presentation

•

Chemistry

•

8th Grade

•

Medium

•

NGSS

MS-PS1-2, MS-PS1-5

Standards-aligned

Used 1K+ times

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3 Slides • 15 Questions

Chemical Reactions

Objective: Identify signs of a chemical reaction.

Fill in the Blanks

Type answer...

https://www.youtube.com/watch?v=2EQznGPZY5A

Multiple Choice

Which is the name of the kind of solid substance formed in this figure?

color change

precipitate

acid

chemicals

Signs of a Chemical Change

https://www.youtube.com/watch?v=q76UNX3otvA

Multiple Select

Check ALL the boxes that show the signs of a chemical change.

sound and smell

air

color change

gas (bubbles) produced

forces

Multiple Choice

In a container, a solid consisting of clear crystals is combined with a blue liquid and the following observations are obtained: How many of the listed observations indicate a new substance was formed?

Multiple Choice

Four students performed four different investigations by combining different substances. Which of the observations is most indicative of a chemical reaction?

investigation 1

investigation 2

investigation 3

investigation 4

Multiple Choice

Which of the following is an example that includes evidence of a chemical reaction?

A sample of zinc is placed in water and it settles to the bottom

A solid block of ice is heated and it completely melts into a liquid.

Sugar that is burned gives off an odor and turns brown and then black.

A tomato is placed into a blender and chopped up into smaller pieces.

Multiple Choice

A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?

The level of the substance in the beaker is higher after the other liquid is added.

A yellow solid forms and then settles to the bottom of the beaker.

Small white crystals are left behind in the flask that held the first liquid.

The mass of the combined liquids is greater than either original liquid.

Multiple Choice

You know you a chemical reaction has occurred if

there is a precipitate.

there is a color change.

there is a temperature change.

All of these answers are evidence.

Multiple Choice

Which is NOT an indication of a chemical change?

temperature change

formation of a precipitate

shape change

production of light

Multiple Choice

Which of the following describes a precipitate?

a liquid forms when a block of metal is heated

a solid forms when one liquid is poured into another

a gas forms when a solid is placed in a liquid

bubbles form when an acid is poured on a rock

Multiple Choice

One of the signs of a chemical reaction taking place is:

Bubbles are produced

Reactants are not combining

Products are not forming

Color is not changing

Multiple Choice

Evidence of a chemical reactions is anything that shows -

a new substance has formed

a solid dissolved in a liquid

interaction between 2 gases

a change in the state of matter

Multiple Choice

The reactants in the image above are:

CH4 and 2 O2

2 H2O and CO2

All of these are reactants

All of these are products

Multiple Choice

This a balanced chemical equation.

True

Fale

Multiple Choice

In the reaction above water is a ________________.

Reactant

Product

Chemical Reactions

Objective: Identify signs of a chemical reaction.

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