Ch. 6 L. 2 Chemical Reactions

Ch. 6 L. 2 Chemical Reactions

By D Olg

Multiple Choice

Chemical change or physical change?

• Chemical Change
• Physical Change

Multiple Choice

Chemical change or physical change?

• Chemical Change
• Physical Change

Multiple Choice

Chemical change or physical change?

• Chemical Change
• Physical Change

Multiple Choice

Chemical change or physical change?

• Chemical Change
• Physical Change

Multiple Choice

Which of the following could indicate that a chemical change took place?

• Change in color

• Production of Energy

• Formation of Gas

• All are correct

Multiple Choice

The difference between a Physical change and a Chemical change is…

• Physical change is only a change to the outside appearance.

• Chemical change is when matter is changed into something new.

• Atoms are rearranged in chemical changes & not in physical.

• All are correct.

Multiple Choice

What does a chemical change result in?

• A change in state of the substance (ex. liquid to solid)

• A change in texture of the substance.

• A change in the way atoms are bonded to each other.

• A change in the appearance of the substance.

Multiple Choice

When a new substance is formed with different properties than the original substance it is called a...

• Chemical change

• Physical change

• Change in State

• Change in appearance only.

Multiple Choice

During Chemical Reactions, the substances that are used are called?

• Precipitate

• Corrosion

• Reactants

• Products

Multiple Choice

During Chemical Reactions, the new substances created are called?

• Precipitate

• Corrosion

• Reactants

• Products

Multiple Choice

_P₄+_O₂ →  _P₂O₃

• 3 P₄+1 O₂ → 2 P₂O₃
• 1 P₄+1 O₂ → 2 P₂O₃
• 1 P₄+ 3 O₂ → 2 P₂O₃
• 1 P₄+ 2 O₂ → 3 P₂O₃

Multiple Choice

_AgNO₃ + _Cu →_Cu(NO₃)₂ + _Ag

• 2 AgNO₃ + 2 Cu → 3 Cu(NO₃)₂ + 1 Ag
• 2 AgNO₃ + 1 Cu → 1 Cu(NO₃)₂ + 2 Ag
• 1 AgNO₃ + 2 Cu → 2 Cu(NO₃)₂ + 1 Ag
• 3 AgNO₃ + 2 Cu → 3 Cu(NO₃)₂ + 2 Ag

Multiple Choice

_SO₂ + _Li₂Se →_SSe₂ + _Li₂O

• 1 SO₂ + 2 Li₂Se → 1 SSe₂ + 2 Li₂O
• 1 SO₂ + 1 Li₂Se → 2 SSe₂ + 2 Li₂O
• 2 SO₂ + 2 Li₂Se → 2 SSe₂ +  2 Li₂O
• 2 SO₂ + 2 Li₂Se → 1 SSe₂ + 1 Li₂O

Multiple Choice

_K + _Cl₂ →_KCl

• 2 K + 16 Cl₂ → 8 KCl
• 2 K + 1 Cl₂ → 2 KCl
• 3 K + 4 Cl₂ → 3 KCl
• 1 K + 1 Cl₂ →1 KCl

Multiple Choice

How many total atoms are represented?         4Al₂O₃

• 2
• 8
• 5
• 20

Multiple Choice

The large number in front of a chemical formula or compound is the ___________. 

• coefficient
• product
• physical
• chemical

Multiple Choice

When balancing equations what does
 -->
mean?

• subscript
• equals
• it is just an arrow
• yield

Multiple Choice

What is a substance called if it speeds up a chemical reaction?

• reusable
• catalyst
• specific
• fragile

Multiple Choice

The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?

• Enzymes increase the energy of the reactants.
• Enzymes decrease the energy level of the products.
• Enzyme decrease the activation energy of the reaction.
• Enzymes reverse the direction of the reaction.

Multiple Choice

In the diagram, what is letter A? 

• product
• substrate
• enzyme-substrate complex
• active site

Multiple Choice

Enzymes are...

• nucleic acids
• proteins
• lipids
• carbohydrates

Multiple Choice

What is the function of an enzyme?

• enzymes break themselves into small pieces
• enzymes slow down chemical reactions
• enzymes speed up chemical reactions
• enzymes combine products to form reactants 

Multiple Choice

Enzymes speed up reaction rates by changing...

• Activation Energy
• pH
• Hydrogen Bonds
• Kinetic Energy

Multiple Choice

Letter D...

• active site
• enzyme
• substrate
• products

Multiple Choice

Letter B...

• active site
• enzyme
• substrate
• products

Multiple Choice

Letter C...

• active site
• enzymes
• substrate
• products

Multiple Choice

Letter E...

• active site
• enzyme
• substrate
• products

Multiple Choice

With what 3 letters do enzymes typically end?

• -ose
• -ase
• -ese
• -tic

Multiple Choice

Any substance that is acted upon by an enzyme is called a(n)?

• Coenzyme
• Substrate
• Vitamin
• Polypeptide

Multiple Choice

What happens when enzymes are heated to a high temperature?

• The enzymes die.

• The shapes of the enzyme are altered.

• The enzymes' amino acid sequence changes.

• The enzymes remain the same

Multiple Choice

What is the activation energy?

• The energy of the products
• The energy of the reactants
• The minimum energy needed by the reactants to form the products.
• The energy lost in the reaction

Multiple Choice

Which factors increase the rate of a reaction.

• increasing temperature
• increasing concentration
• increasing surface area
• all of these

Multiple Choice

What kind of reaction is this?

• Endothermic
• Exothermic
• Cannot be determined

Multiple Choice

What term is given to a reaction which transfers heat energy to the surroundings?

• Endothermic

• Reversible

• Exothermic

• Exotermic

Multiple Choice

What letter represents the energy of the products?

• A
• B
• C
• D