Reactivity

In a chemical reaction, there are breaking bond and forming bond.

Which of the following statements are correct?

• Bonds breaking happens in reactants

• Bonds formation happens in products

• Breaking bond is exothermic

• Forming bond is endothermic

Tags

NGSS.MS-PS1-2

Endothermic reaction happens where heat absorbed during bond breaking is ____________ heat released during bond formation.

• equal to

• higher than

• lower than

Tags

NGSS.HS-PS1-4

Sherbet sweets leave a cool refreshing feeling in our mouth.

This is an ........................ reaction.

• endothermic

• exothermic

Tags

NGSS.MS-PS1-4

Group 1 metals like lithium, react with water vigorously.

This is an ..................... reaction.

• endothermic

• exothermic

Tags

NGSS.MS-PS1-2

NGSS.MS-PS3-4

Zinc chloride + Magnesium -->

• Magnesium chloride

• Zinc

• No reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Copper + Iron sulfate -->

• Copper sulfate

• Iron

• No reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Zinc chloride + Magnesium -->

Choose the correct statements about this reaction.

• Magnesium will displace zinc from zinc chloride.

• Zinc will displace magnesium.

• Magnesium is more reactive than zinc.

• Magnesium cannot displace zinc.

Does displacement reaction happen? Why?

• Yes, copper is more reactive than iron.

• Yes, iron is more reactive than copper.

• No, iron is less reactive than copper.

• No, copper is less reactive than iron.

Tags

NGSS.MS-PS1-2

To prepare a zinc chloride salt, we need to react _________ and ________ together.

Choose the correct pairs of reactants.

• zinc and chlorine

• zinc oxide and hydrochloric acid

• zinc and hydrochloric acid

• zinc hydroxide and nitric acid

Tags

NGSS.MS-PS1-2

To prepare copper chloride salt, arrange the steps below in correct order:

I: Pour the filtrate into an evaporating dish and heat gently until crystals formed.

II: Add copper oxide into hydrochloric acid. Heat and stir the mixture.

III: Allow the mixture to cool. Filter the mixture.

IV: Dry the crystals with filter papers.

V: Cool and evaporate to get crystal.

• II > I > III > V > IV

• II > III > I > IV > V

• II > III > I > V > IV

• II > I > III > IV > V

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5