Unit 3 Question Preview (ID: 33045)


Unit 3: Physical And Chemical Changes, Chemical Reactions, And Law Of Conservation Of Matter. TEACHERS: click here for quick copy question ID numbers.

Which of these is not evidence that a chemical change may have taken place?
a) release of heat
b) formation of a precipitate
c) change in shape
d) change in color

You can balance a chemical equation by changing the
a) reactants
b) coefficients
c) subscripts
d) products

Which of the following statements about elements is false?
a) A element is a pure substance
b) An element is made up of compounds
c) An element is represented by a chemical symbol
d) Each element has its own atomic number

Which of these is a physical change?
a) forming a precipitate
b) rusting
c) melting
d) burning

Which is always true of a balanced chemical equation?
a) Coefficients on both sides of the equation are multiples of 2
b) The subscripts on one side of the equation are the same as the subscriptions on the product side
c) The number of molecules is the same on both sides of the equation
d) Both sides of the equation contain the same elements and the same number of atoms

If you heat a liquid to determine the temperature at which it forms bubbles and changes to a gas, you are measuring
a) a physical property called conductivity
b) a chemical property called reactivity
c) a physical property called boiling point
d) a chemical property called solubility

Elements in the same column of the periodic table have
a) similar chemical properties
b) the same number of protons
c) similar atomic masses
d) atoms of the same size

According to the law of conservation of mass, which of the following is a true statement about any chemical reactions?
a) The total mass of the reactants is greater than the total mass of the products
b) The total mass of the reactants is less than the total mass of the products
c) The total mass of the reactants equals the total mass of the products
d) In a chemical reaction, matter can be created but not destroyed

According to the law of conservation of mass, which of these statements is true?
a) New matter is created in a chemical reaction
b) Atoms are broken down into smaller parts in a chemical reaction
c) The mass of the reactants in a chemical reaction is greater than the mass of the products
d) The mass of the reactants in a chemical reaction equals the mass of the products

Which is a clue that a chemical change has occurred?
a) A beaker becomes warmer when you mix two room-temperature liquids in it
b) Water changes colors when you add food coloring to it
c) Water bubbled when it is boils
d) A piece of metal becomes a different shape

Which of the following would cause a chemical change in a piece of wood?
a) hammering a nail into the wood
b) burning the wood
c) painting the wood
d) sawing the piece of wood in half

A physical change is taking place when
a) a piece of paper burns
b) a piece of fruit rots
c) onions are chopped
d) a nail rusts

What happens during a physical change?
a) New substances form
b) The identity of a substance is changed
c) A chemical reaction occurs
d) A property of the substance changes, but its identity stays the same

An 88 gram iron nail rusted. The rusted nail (iron oxide) had a mass of 102 grams. What was the mass of oxygen that reacted with the nail?
a) 14 g
b) 88 g
c) 102 g
d) 200 g

Which process represents a chemical change?
a) melting of ice
b) corrosion of iron
c) evaporation of alcohol
d) solubility of sugar

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