Intro: Lesson Chemical Reactions- C.C.

Open Ended

How would you describe a chemical reaction?

Multiple Choice

What is a chemical reaction?

• A process by which one or more substances are changed into one or more different substances

• A process where substances are physically mixed but not changed

• A process where substances are separated without changing their properties

• A process where substances are heated but remain the same

Open Ended

Can you think of an example of a chemical reaction that you have seen or experienced?

Multiple Select

Which of the following statements about chemical equations is/are correct?

• Chemical equations represent reactions in writing

• The arrow in a chemical equation separates reactants from products

• Reactants are always written to the right of the arrow

• Products are always written to the left of the arrow

Multiple Choice

In this chemical reaction, which is the product/s?

Magnesium + Oxygen --> Magnesium oxide

• magnesium

• magnesium and oxygen

• magnesium oxide

• oxygen

Multiple Select

What are some indicators that a chemical reaction has occurred? CHECK BOX ALL THAT APPLY

• Change in color

• Formation of a gas

• Change in temperature

• Boiling of water

Multiple Choice

Which of the following is NOT an indication of a chemical reaction?

• Energy change (Heat, Light)

• Production of gas (bubbles, fizz, smoke)

• Change in color

• Change in shape

Multiple Choice

What is the definition of percipitate?

• A solid that forms in a solution during a chemical reaction.

• A substance that evaporates from a solution during a chemical reaction.

• A liquid that forms in a solution during a chemical reaction.

• A gas that forms in a solution during a chemical reaction.

Multiple Choice

What is physical change?

• How two chemicals react with one another when combined

• A property that we can measure or observe with our 5 senses or other tools

• When two chemicals react with one another to form a new substance

• When a change occurs but it does not result in the formation of a new substance

Multiple Select

Which of the following are examples of physical changes? CHECK BOX ALL THAT APPLY

• Crushing a rock

• Digesting food

• Water evaporating

• Getting a haircut

Multiple Select

Which statements about the law of conservation of mass are correct?

• Atoms are rearranged but not created or destroyed in chemical reactions.

• The number of atoms of each element must be the same on both sides of a chemical equation.

• A chemical equation must be balanced to correctly describe a reaction.

• Atoms can be destroyed in chemical reactions.

Multiple Choice

What does the law of conservation of mass state about the total mass of reactants and products in a chemical reaction?

• The total mass of reactants is greater than the total mass of products.

• The total mass of reactants is less than the total mass of products.

• The total mass of reactants must equal the total mass of products.

• The total mass of reactants and products is not related.

Multiple Choice

Which of the following statements about coefficients in chemical equations is/are correct?

• Coefficients are placed in front of formulas to balance equations.

• Coefficients represent the number of atoms in a molecule.

• Coefficients should never be altered when balancing equations.

• Coefficients are always equal to one.

Multiple Choice

What does the number 4 represent in 4NH₃?

• Subscript

• Coefficient

• Superscript

• Reactant

Multiple Choice

If there is no coefficient (example _?_NH3) in front of a chemical formula, what number is it understood to be?

• Zero

• One

• Two

• Ten

Multiple Choice

How many silicon (Si) atoms and how many hydrogen (H) atoms are present in

4 SiH2?

• 4 Si and 5 H

• 4 Si and 8 H

• 4 Si and 3 H

• 2 Si and 4 H

Drag and Drop

The are ​

Placeholder

atoms of oxygen atoms in a compound with parentheses, such as Ca(OH)2.

Drag these tiles and drop them in the correct blank above

2

3

1

4