unit 4 chemical reactions

Define the Law of Conservation of Mass

• That it can be created and destroyed but can't be transfer

• That it can't be created or destroyed but can be transfer

• Neither of these are correct

• That it can be reactants but not be a product

According to the Law of Conservation of mass the mass of the reactants must be _________ to the mass of the product

• More than

• Less than

• Equal

• Aqueous

In a chemical reaction atoms are created and destroyed

(False or True)

• True

• False

What are Reactants

• New substances are produced left side

• On the left side of the equation and substances that are about to react

• On the right side of the equation and they are substances that transfer to new substances

• All of them

What are Products

• New substances that produced on the right side of the equation

• New substances that are produced on the left side of the equation

• Substances that are about to react on the left side of the equation

• Substances that are about to react on the right side of the equations

A chemical reaction occurs between Zinc metal and hydrochloric acid - just like the one we did in class. We started with 200 grams of zinc and acid, but after the reaction we only have 195 grams of products. We know that mass is conserved so what happen to the other 5 grams.

• The atoms was kept sealed in the vial

• Open systems

• Closed system

• The atoms was resales to the environment

What does the (S) and (L) and (G) stand for

• Solids and Liquid and Gas

• South and Large and Grams

• Smell and Length and Germs

• Small and Large and Gain

What does these mean (aq) and -> (arrow)

• Yield/ heat light and electricity

• Dissolved in the water

• Dissolved in the heat

• It another term for the use of the reactants and products

What do subscripts tell you in a chemical formula

• bottoms (little numbers)

• With the equations

• On top (big numbers)

• none of these

How many hydrogen atoms are present in 1 molecule of acetic acid (Vinegar)

HC2H3O2

• 4 Hydrogen

• 21 Hydrogen

• 3 Hydrogen

• 0 Hydrogen