Science chapter 9

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When a substance combines with O2 and releases energy,a_______ reaction has occured.

Combustion

True/False: The law of conservation of mass, Can three atoms of calcium can react to produce six atoms of calcium

False

True/Flase: All chemical reasctions occur at the same rate

False

What is the difference between a physical and chemical change?

Chemical chanhes ocxir with synthesis Physical changes are used to seperate diffrwnt items or substances

______________is a form of energy contained in chemical bonds.

Chemical energy

How many significant digits are in the these numbers: 063.82400

5

Breaking a chemical bond...... A. Absorbs energy from the surrondings B.releases energy into the surruondings C. Creates energy that did not not oreviously exist D.usues up energy that then no longer exists

A.absorbs energy from the surroundings

All substances.... A. are elements B. Are compunds C. have a fixes arrangement of atoms D.contain hydrogen

A.are elements

What is force

Any push or pull on an object

Endothermic reactions....... A.release more energy than they absorb B.absorb more energy than they release C.release and absorb exactly the same amount of enwrgy D.can wither release energy or absorb it

B.absorb more energy than they realease

A change in______ is a sign of energy being used in a chemical reaction. A.temperature B.color C.odor D.texture

B.color

Forming a chemical bond........ A.absorbs energy from the surrondings B.releases energy into the surrondings C.creates energy that did not previously exist D. Uses up energy that then no longer exists

B.releases energy into the surrondings

Baking soda is mised towgther what is the weight gonna be after doing the experiment? A. The orginal weight B. New added on weight C.the two equal weights that are equal the same mass

C. The two weights that equal he same mass

An exothermic reaction...... A.absorbs thermal energy B.needs energy to be added contantitly C.releases thermal energy D.needs more energy to break chemical bonds

C.releases thermal energy

Which of the following is NOT a result of a chemical reaction? A.bubbles in boiling water B.a solid forming feom two liquids reacting C.copper turning green when exposed to air D.the light given off by firefly

D. The light ficen off by a firefly

A_________slows or stops a chemical reaction. A.catalyst B.enzyme C.activator D.Inhibitor

D.Inhibitor

Which of the following is certain proof a chemical reaction has occured? A.bubbles B.change of chemical properties C.change of color D.all of the above

D.all of the above

Which one if the following factors would NOT speed up a chemical reaction? A.increasing the concentration of a reactant B.adding a catalyst C.raising the temperature D.making the reactant particles larger

D.making the reactant particles larger

A catalyst is which of the following? A.a reactant B.a product C.both a and b D.neither a or b

D.neither a or b

What change ia chemical rather than physical? A.water is boiled B.aluminum foil is crumped C.glass is shattered D.wood is burned

D.wood is burned

Dkes an endothermic or exothermic need more activation energy?

Endothermic

What is a reaction that absorbs energy?

Endothermic

What speeds up reactions in living cells

Enzyme

What is a reaction that releases energy

Exothermic

Breaking a chemical bond____________energy.

Forms

What is used to slow the spoilage of food

Inhibitor

What is present after a chemical reaction

Physical change

What substance is written to the right of an arrow?

Product

What is a measure of how fast a reaction occurs

Rate of reaction

What is present before a chemical reaction?

Reactants

What are the 5 states of matter?

Solid,liquid,gas,plasma, Bose Einstein condensate

If two or more substances combine to produce one substance, a _______ reaction has occured

Synthesis

According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?

The masses are always equal

Explain what is meant by a balanced chemical equation

To have a balcnced chemical equation you have to have the correct formulas in order so it will all make sense

True/False: A chemcial reaction in which more energy is absorbed than is released is endothermic

True

How can you determine the rate of a chemical reaction

You can look for chanhes in porperties to find out what the rate will be

What is the reactants mass equals the product mass

conservation of mass


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