MG_L_5^15(MU_Lab Conservation of Mass)

What is the definition of chemical reaction?

• The input which reacts chemically to create product
• a system where none of the reactants or products are allowed to escape
• occurs when the atoms and molecules of two or more substances rearrange to form new substances
• the output, or result of a chemical reaction

During a chemical reaction, matter cannot be _______ or created.

• bought

• changed

• destroyed

• made

__________ are the substances present before the chemical reaction takes place.

• products

• elements

• compound

• reactants

The _________ are the substances present after the chemical reaction takes place.

• reactants

• compound

• products

• elements

Lead nitrate & potassium iodide react, forming lead iodide & potassium nitrate. The reactants are

• lead nitrate

• potassium iodide

• lead iodide

• potassium nitrate

In this chemical equation , CH₄ and 2O₂ are called the...

• Products

• Reactants

• Coefficient

• Subscript

The Law of Conservation of Mass States

• Energy cannot be created nor destroyed, it can only change form.

• Mass cannot be created nor destroyed, it can only change form.

• Mass can be created or destroyed, it cannot change form.

In this chemical equation , CO₂ and 2H₂O are called the...

• Products

• Reactants

• Coefficient

• Subscript

How many atoms of carbon are shown on EACH side of this chemical reaction?

• 1

• 3

• 4

• 5

Looking at the reactants, there is _____ molecule(s) of CH₄ and _______ molecule(s) of O₂.

• 1, 1

• 1, 2

• 2, 2

• 2, 4