Chemical Indicators from Equations Practice

Which of the following describes a precipitate?

• a new liquid forms when a solid reactant is heated and melts

• a new solid product formed from two aqueous reactants

• a new gas forms when a solid is dissolved in a liquid

• bubbles form when two aqueous reactants are mixed

• a new solid forms when an aqueous reactant freezes

Tags

NGSS.MS-PS1-2

All of the following are indicators of a chemical reaction except one. Which one is NOT an indicator that a chemical reaction has taken place?

• the production of heat or light

• a color change

• the production of gas bubbles

• the dissolving of one substance in another

• an odor change

Tags

NGSS.MS-PS1-2

Examine the chemical equation. Check the box(es) below of the particular indicator(s) present in the equation.

HCl (aq) + NaOH (aq) --> NaCl (aq) + H₂O (l)

• formation of water

• gas bubbles produced

• formation of a precipitate

• color change

• energy change

Tags

NGSS.HS-PS1-4

Examine the chemical equation. Check the box(es) below of the particular indicator(s) present in the equation. Select all that apply.

AgNO₃ (aq) + NaCl (aq) --> AgCl (s) + NaNO₃ (aq)

• formation of water

• gas bubbles

• formation of a precipitate

• color change

• energy change

Examine the chemical equation. Check the box(es) below of the particular indicator(s) present in the equation. Select all that apply.

Na₂CO₃ (s) + HCl (aq) --> H₂O (g) + NaCl (aq) + CO₂ (g)

• formation of water

• gas bubbles

• formation of a precipitate

• color change

Tags

NGSS.MS-PS1-2

Examine the chemical equation. Check the box(es) below of the particular indicator(s) present in the equation. Select all that apply.

• gas evolution

• color change

• precipitate formation

• energy change

• water formation

Tags

NGSS.HS-PS1-4

Examine the chemical equation. Check the box(es) below of the particular indicator(s) present in the equation. Select all that apply.

• gas bubbles produced

• color change

• precipitate formation

• energy change

• water formation

Tags

NGSS.HS-PS1-4

Examine the chemical equation. Check the box(es) below of the particular indicator(s) present in the equation. Select all that apply.

• gas evolution

• color change

• precipitate formation

• energy change

• water formation

Tags

NGSS.HS-PS1-4

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

Tags

NGSS.MS-PS1-2

Solid, colorless crystals are added to a test tube with a blue solution. The following observations are obtained.

Which one(s) are indicative of a chemical reaction taking place? Select all that apply.

• The color of the liquid changes from blue to yellow.

• The solid crystals appeared to get smaller.

• The solution temperature changed from 25 degrees to 30 degrees.

• Bubbles were forming in the container.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4