Study Guide MS- PS1-2 Test 2019-2020

1

A balanced equation demonstrates...

Energy has neither been created or destroyed

There was an exothermic reaction

There is the same amount of atoms on both side of the equation

The law of conservation of mass

The law of conservation of energy

12

Magnesium burns with a brilliant white light and is used in pyrotechnics, flares and photographic flashbulbs. Magnesium is the lightest metal that can be used to build things, although its use as a structural material is limited since it burns at relatively low temperatures.
The chemical equation, 2MgO₂ ---> 2MgO + O₂ shows this reaction.
Fill in the appropriate symbols and models to determine if the equation is balanced or not.

1

A student named Aspen in a lab at UCLA was trying to synthesize ammonia using Nitrogen (N₂) and Hydrogen (H₂) gas.
Below is the chemical equation with results:
Was this student successful in creating a chemical reaction? How do you know?
How do you know that a chemical reaction has occurred.
Name at least 2 signs that a chemical reaction has occurred. If a chemical reaction has not occurred, explain why.
Sentence starters: “A chemical reaction did/did not occur.” My evidence for why a reaction did/did not occur is…”

1

What can you change when balancing a chemical equation?

Catalyst

Coefficient

Subscript

Elements

2

Balance the chemical equation.

4

Balance the chemical equation.

1

2

Relate the writing and balancing of a chemical equation to the law of conservation of mass.

2

Will the mass of the sealed jar and its contents change as the candle burns?

A Yes, the mass will decrease as the candle burns and gets smaller.

B No, the mass will remain the same. It is a closed system.

C Yes, the mass will increase and smoke is made.

2

1

2

Josh Moffit created the model above to explain what happens in a chemical reaction.
Examine the model and use what you know about chemical reactions to
A) Determine whether Josh’s model correctly explains that a chemical reaction conserves atoms. Support your answer using the model to describe the atoms that make up hydrogen, oxygen and water. Be sure to include the number and types of atoms for each molecule before and after heating.

2

Josh created a model above to explain what happens in a chemical reaction. He made the model above. Examine the above model and use what you know about chemical reactions to determine whether Josh’s model:
2. How does Joshua's model correctly explains that a chemical reaction produces a new substance. Support your answer using the model to describe the atoms that make up hydrogen, oxygen and water. Be sure to include the number and types of atoms for each molecule before and after heating.

1

Which of the following is true of chemical equations?

A Subscripts can be changed to have the same number of each type of atom on both sides of the equation.

B Coefficients are used to have the same number of each type of atom on both sides of the equation.

C The basic format for a chemical equation is Products ---> Reactants.

D A chemical equation represents a physical change that occurs.

1

Which of the following is a physical change?

A Sodium hydroxide pellets dissolving in water.

B Bubbles of hydrogen gas being produced.

C Hydrogen and oxygen combining to form water.

D Hydrogen gas catching on fire.

1

Study Guide MS- PS1-2 Test 2019-2020

A balanced equation demonstrates...

What can you change when balancing a chemical equation?

Balance the chemical equation.

Balance the chemical equation.

Relate the writing and balancing of a chemical equation to the law of conservation of mass.

Will the mass of the sealed jar and its contents change as the candle burns?

Which of the following is true of chemical equations?

Which of the following is a physical change?

Start Socrative:
Room Name: X5EB2CTM6
Type your score after

A balanced equation demonstrates...

What can you change when balancing a chemical equation?

Balance the chemical equation.

Balance the chemical equation.

Relate the writing and balancing of a chemical equation to the law of conservation of mass.

Will the mass of the sealed jar and its contents change as the candle burns?

Name the two types of energy given off by the burning candle and the combustion of methane gas.

Name the two substances given off by the burning candle and the combustion of any fuel such as propane, coal or gasoline.

Which of the following is a supported claim about a burning candle?

After the candle burns, the remaining wax has mass than the original candle because the rest of the original candle's mass .

Which of the following is true of chemical equations?

Which of the following is a physical change?

Start Socrative:
Room Name: X5EB2CTM6
Type your score after

Name the two types of energy given off by the burning candle and the combustion of methane gas.

Name the two substances given off by the burning candle and the combustion of any fuel such as propane, coal or gasoline.

Which of the following is a supported claim about a burning candle?

After the candle burns, the remaining wax has mass than the original candle because the rest of the original candle's mass .

Study Guide MS- PS1-2 Test 2019-2020

Study Guide MS- PS1-2 Test 2019-2020

A balanced equation demonstrates...

What can you change when balancing a chemical equation?

Balance the chemical equation.

Balance the chemical equation.

Relate the writing and balancing of a chemical equation to the law of conservation of mass.

Will the mass of the sealed jar and its contents change as the candle burns?

Which of the following is true of chemical equations?

Which of the following is a physical change?

Start Socrative: Room Name: X5EB2CTM6Type your score after

A balanced equation demonstrates...

What can you change when balancing a chemical equation?

Balance the chemical equation.

Balance the chemical equation.

Relate the writing and balancing of a chemical equation to the law of conservation of mass.

Will the mass of the sealed jar and its contents change as the candle burns?

Name the two types of energy given off by the burning candle and the combustion of methane gas.

Name the two substances given off by the burning candle and the combustion of any fuel such as propane, coal or gasoline.

Which of the following is a supported claim about a burning candle?

After the candle burns, the remaining wax has ____ mass than the original candle because the rest of the original candle's mass ____.

Which of the following is true of chemical equations?

Which of the following is a physical change?

Start Socrative: Room Name: X5EB2CTM6Type your score after

Name the two types of energy given off by the burning candle and the combustion of methane gas.

Name the two substances given off by the burning candle and the combustion of any fuel such as propane, coal or gasoline.

Which of the following is a supported claim about a burning candle?

After the candle burns, the remaining wax has ____ mass than the original candle because the rest of the original candle's mass ____.

Start Socrative:
Room Name: X5EB2CTM6
Type your score after

After the candle burns, the remaining wax has mass than the original candle because the rest of the original candle's mass .

Start Socrative:
Room Name: X5EB2CTM6
Type your score after

After the candle burns, the remaining wax has mass than the original candle because the rest of the original candle's mass .