What number and types of atoms occur in a formula unit of Ca(NO 3 ) 2 ?

1 calcium, 2 nitrogen, 6 oxygen

Sodium sulfate and barium chloride react with each other to form sodium chloride and barium sulfate as shown. Which statement most accurately describes the mass of the reactants compared to the mass of the products?

The mas of the reactants is the same as the products.

The products have a greater mass because matter was created during the reaction.

The reactants have a greater mass because some of the mass was converted to heat.

The reactants have a greater mass because some matter was destroyed by the reaction.

A chemical reaction separates water into hydrogen gas and oxygen gas. Which of the following statements is true about the mass of the water and the combined mass of the two gases?

The combined mass of the two gases is the same as the mass of the water.

The mass of the water is greater than the combined mass of the two gases.

The combined mass of the two gases is much greater than the mass of the water.

The mass of the water is the same as double the combined mass of the two gases.

How does the concept of conservation of mass apply to chemical reations?

The reactants and products have exactly the same atoms.

The reactants and products have exactly the same molecules.

The change in the amount of matter is equal to the change in energy.

The change in the amount of matter is only a small percentage of the total mass.

Mr. Martin adds vinegar to baking soda. Which shows that the vinegar and baking soda react chemically?

The mass of the products increase.

The substances form a solution.

One of the reactants is a liquid.

Unit 1: Chemical Reaction Review

Authored by Shay Stewart

Science

7th Grade

NGSS covered

Used 85+ times

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MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Which is the best evidence that a chemical change has occurred?

Change of state

Release of energy

Temperature change

Formation of a new substance

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

The diagram for the structural formula of ethanol shows the elements and their arrangements. What does the circled part of the diagram represent?

An atom

Any ion

One molecule

An electron

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Ozone is three oxygen atoms bonded together. It can sometimes be smelled in the air after a thunderstorm. The smell is a result of

Pollution

Condensation

A chemical change

A physical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Calcium carbonate (CaCO₃) is considered a compound because it is made up of two or more

Moleules

Elements

Gasses

Solids

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Louis was investigating physical and chemical changes in matter. Which of these changes that Louise found involves a chemical change in matter?

Evaporation of water

Grinding of a rock

Melting of ice

Rusting of a nail

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The diagram represents the chemical reaction that occurs when propane combusts. In the reaction, for every molecule of propane, how many molecules of oxygen are used?

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The image shows two processes. Which statement best compares the processes?

They both form a new atom.

They both form a new molecule.

Process 1 forms a new molecule, and process 2 forms a new atom.

Process 1 forms a new atom, and process 2 forms a new molecule.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-1

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Unit 1: Chemical Reaction Review

Which is the best evidence that a chemical change has occurred?

The diagram for the structural formula of ethanol shows the elements and their arrangements. What does the circled part of the diagram represent?

Ozone is three oxygen atoms bonded together. It can sometimes be smelled in the air after a thunderstorm. The smell is a result of

Calcium carbonate (CaCO₃) is considered a compound because it is made up of two or more

Louis was investigating physical and chemical changes in matter. Which of these changes that Louise found involves a chemical change in matter?

The diagram represents the chemical reaction that occurs when propane combusts. In the reaction, for every molecule of propane, how many molecules of oxygen are used?

The image shows two processes. Which statement best compares the processes?

Which of the following best describes two atoms of oxygen that are chemically bonded to each other?

What number and types of atoms occur in a formula unit of Ca(NO₃)₂?

Which is a compound?

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science

Unit 1: Chemical Reaction Review

Which is the best evidence that a chemical change has occurred?

The diagram for the structural formula of ethanol shows the elements and their arrangements. What does the circled part of the diagram represent?

Ozone is three oxygen atoms bonded together. It can sometimes be smelled in the air after a thunderstorm. The smell is a result of

Calcium carbonate (CaCO3) is considered a compound because it is made up of two or more

Louis was investigating physical and chemical changes in matter. Which of these changes that Louise found involves a chemical change in matter?

The diagram represents the chemical reaction that occurs when propane combusts. In the reaction, for every molecule of propane, how many molecules of oxygen are used?

The image shows two processes. Which statement best compares the processes?

Which of the following best describes two atoms of oxygen that are chemically bonded to each other?

What number and types of atoms occur in a formula unit of Ca(NO3)2?

Which is a compound?

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science

Calcium carbonate (CaCO₃) is considered a compound because it is made up of two or more

What number and types of atoms occur in a formula unit of Ca(NO₃)₂?