CHEMICAL EQUATIONS AND REACTION TYPES

Multiple Choice

The red numbers in the image below represent ________

• subscripts
• coefficients
• I don't know, and don't want to try
• None of the answers are correct

Multiple Choice

After blowing out the flame on the candle, James noticed the wick changed from white to black, this is a

• Physical Property
• Physical Change
• Chemical Property 
• Chemical Change 

Fill in the Blank

During a lab investigation, students followed this procedure:

Students observed bubbles immediately forming around the chalk. After the bubbles stopped forming, the students noticed that the chalk was smaller. Some students tried to recover the missing chalk from the vinegar, but no chalk particles were visible. 

What kind of change did the chalk undergo AND what evidence could be used to support the answer?

.

Multiple Choice

In a laboratory experiment, a student observes that a vinegar-baking soda mixture becomes colder over time. What type of reaction is likely occurring, and what evidence supports this conclusion?

• Exothermic; the reaction releases heat.

• Endothermic; the reaction absorbs heat.

• Exothermic; the reaction absorbs light.

• Endothermic; the reaction releases gas.

Fill in the Blank

This is the decomposition reaction of hydrogen peroxide. According to the law of conservation of mass, if you start with 40g of hydrogen peroxide you should end up with _____g of water and oxygen combined.

Multiple Choice

Which of the following is NOT one of the 7 diatomic molecules?

• F₂

• O₂

• S₂

• Br₂

Multiple Choice

What do the symbols + and → represent in chemical equations?

• + separates reactants or products

• → indicates a catalyst

• + indicates a solid state

• → indicates a liquid state

Fill in the Blank

Balance this equation

_ S + _ O₃ → _ SO₂

Note: Write the coefficient "1" to avoid ambiguity

Multiple Choice

When the equation NH₃ + O₂ --> HNO₃ + H₂O is completely balanced using smallest whole numbers, the coefficient of O₂ would be

• 1
• 2
• 3
• 4

Multiple Choice

When the equation is balanced what are the correct coefficients?

• 1, 1, 2

•  1, 3, 1

• 2, 2, 3

• 2, 3, 2

Fill in the Blank

Balance the following combustion reaction.

___ C₃H₈ + ___ O₂ → ___ CO₂ + ___ H₂O

,

,

,

Multiple Choice

What are the products of this single replacement reaction: Mg + CuSO₄

• Cu + MgSO₄

• Cu + SO₄Mg

• Cu + Mg(SO₄)₂

• No Reaction

Multiple Choice

What is essential for a combustion reaction to begin?

• Carbon dioxide
• Fuel 
• Fuel, oxygen and heat
• Water and oxygen

Multiple Select

Select all of the following that will be no reactions:

• Ag + KNO₃ -->

• Cu + FeSO₄ -->

• Zn + AgNO₃ -->

• Cl₂ + NaBr -->

• S + MgCl₂ -->

Multiple Choice

In this equation,
CuCl₂ + NaOH  → Cu(OH)₂ + NaCl
Which product is insoluble?

• copper(II) hydroxide
• sodium chloride
• sodium hydroxide
• copper(II) chloride

Categorize

Options (10)

potassium

nitrates

sodium

ammonium

acetates

chlorides

carbonates

lithium

sulfates

barium

Organize the ions into soluble or insoluble categories using the SNAP rules.

soluble

insoluble

Multiple Choice

What is the difference between an overall ionic equation and a net ionic equation?

• An overall ionic equation shows all ions, while a net ionic equation shows only reacting ions.

• An overall ionic equation shows only reacting ions, while a net ionic equation shows all ions.

• Both equations show the same information.

• An overall ionic equation is used for single replacement reactions, while a net ionic equation is used for double replacement reactions.

Multiple Choice

What are the spectator ions in the reaction of sodium chloride with silver nitrate?

• silver and nitrate
• sodium and chloride
• sodium and nitrate
• silver and chloride

Fill in the Blank

$$H_2C_2O_4+K_2MnO_4\rightarrow CO_2+K_2O+Mn_2O_3+H_2O$$  K potassium oxidation number in the products

+

Multiple Choice

$$H_2C_2O_4+K_2MnO_4\rightarrow CO_2+K_2O+Mn_2O_3+H_2O$$ C is 

• oxidized

• reduced

• spectator ion

Multiple Choice

$$H_2C_2O_4+K_2MnO_4\rightarrow CO_2+K_2O+Mn_2O_3+H_2O$$ K is  

• oxidized

• reduced

• spectator ion

Multiple Select

What must occur to have an effective reaction to occur? (Select all answers that apply).

• Sufficient energy

• Correct orientation

• Two different reactants.

• minimum activation energy

Multiple Choice

A ______________ is a substance that increases the rate of a reaction without being used up during the reaction. 

• catalyst
• product
• reactant
• solute

Multiple Select

Select the factors that can speed up a chemical reaction (can select multiple answers).

• Increase temperature

• Increase pressure (gases only)

• Increase surface area

• Add catalyst

• Increase concentration

Poll

How confident do you feel about this topic now?

• Very confident
• Somewhat confident
• Not confident