-Choose the correct answer by clicking on your answer choice. Only one answer is correct. (2 pts. each)
Question 1
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Question 2
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Question 3
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Question 4
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Question 7
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Question 23
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Question 25
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COMPLETION
-Complete the following questions by selecting the correct answer from the word bank for questions 32 - 40. Questions 26 - 31 have no word bank. Misspelled words will be marked as incorrect. Some answers may be used more than once, others may not be used at all. (2 pts. each)
Question 26
26.
A(n) ____________________ is used to balance chemical equations.
Question 27
27.
The number that cannot change to balance a chemical equation is the ______________________.
Question 28
28.
If an energy diagram shows products at a lower energy than the reactants, the diagram shows an ___________________ reaction.
Question 29
29.
In a double-displacement reaction, _______________________ from two compounds exchange places.
Question 30
30.
Energy released in exothermic reactions was first stored in chemical bonds in the ___________________________.
Question 31
31.
Paper will burn at 451o F. For this chemical reaction to begin, 451oF is the _____________________________.
Word Bank
chemical formula double-displacement coefficient inhibitor chemical reaction
activation energy single-displacement catalyst subscript diatomic
chemical bond substances molecules synthesis decomposition
endothermic exothermic ions reactants products
Question 32
32.
A shorthand notation that represents a compound or diatomic molecule is called a(n) __________________________.
Word Bank
chemical formula double-displacement coefficient inhibitor chemical reaction
activation energy single-displacement catalyst subscript diatomic
chemical bond substances molecules synthesis decomposition
endothermic exothermic ions reactants products
Question 33
33.
The minimum amount of energy needed to start a reaction is called _________________________.
Word Bank
chemical formula double-displacement coefficient inhibitor chemical reaction
activation energy single-displacement catalyst subscript diatomic
chemical bond substances molecules synthesis decomposition
endothermic exothermic ions reactants products
Question 34
34.
In a(n) __________________________ reaction, ions in different compounds switch places.
Word Bank
chemical formula double-displacement coefficient inhibitor chemical reaction
activation energy single-displacement catalyst subscript diatomic
chemical bond substances molecules synthesis decomposition
endothermic exothermic ions reactants products
Question 35
35.
In a chemical formula, if no ___________________ is written after an element, then only one atom of the element is present.
Word Bank
chemical formula double-displacement coefficient inhibitor chemical reaction
activation energy single-displacement catalyst subscript diatomic
chemical bond substances molecules synthesis decomposition
endothermic exothermic ions reactants products
Question 36
36.
A substance that slows down or stops a chemical reaction is called a(n) ________________________.
Word Bank
chemical formula double-displacement coefficient inhibitor chemical reaction
activation energy single-displacement catalyst subscript diatomic
chemical bond substances molecules synthesis decomposition
endothermic exothermic ions reactants products
Question 37
37.
The force that holds two atoms together is called a ____________________________.
Word Bank
chemical formula double-displacement coefficient inhibitor chemical reaction
activation energy single-displacement catalyst subscript diatomic
chemical bond substances molecules synthesis decomposition
endothermic exothermic ions reactants products
Question 38
38.
When _____________________ bump into one another with enough energy, chemical bonds break.
Word Bank
chemical formula double-displacement coefficient inhibitor chemical reaction
activation energy single-displacement catalyst subscript diatomic
chemical bond substances molecules synthesis decomposition
endothermic exothermic ions reactants products
Question 39
39.
When chemical bonds break, the atoms rearrange to form new ____________________.
Word Bank
chemical formula double-displacement coefficient inhibitor chemical reaction
activation energy single-displacement catalyst subscript diatomic
chemical bond substances molecules synthesis decomposition
endothermic exothermic ions reactants products
Question 40
40.
A molecule made up of two atoms is ___________________.
Matching
-Complete the following matching questions by clicking on the correct answer. Only one answer is correct. (2 pts. each)
Question 41
41.
Question 42
42.
Question 43
43.
Question 44
44.
Question 45
45.
Matching
-Match the graph labels to the corresponding letters. (2 pts. each)
Question 46
46.
Question 47
47.
Question 48
48.
Question 49
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Question 50
50.
Do NOT forget to turn in this assignment on Google Classroom after you have submitted it here! No credit will be awarded for unsubmitted assignments.
Which of the following is NOT a sign of a chemical reaction?
A. gas formation
B. solid formation
C. energy change
D. state change
What causes chemical bonds in molecules to break?
A. Molecules bump into each other with enough energy to break them.
B. Different substances are combined in a solution.
C. The temperature of a solution is lowered.
D. A solid dissolves in a liquid.
A calcium carbonate molecule has 1 calcium (Ca) atom, 3 oxygen (O) atoms, and 1 carbon (C) atom. Which of the following shows the chemical formula for calcium carbonate?
A. 3CaCO
B. Ca2CO2
C. CaCO3
D. CaC2O3
What is the charge of an ionic compound?
A. zero
B. +1
C. -1
D. +2
Which of the following uses coefficients correctly to balance the equation N2 + H2 ------> NH3 ?
A. N2 + 3H2 ------> 2NH3
B. 2N2 + 2H2 ------> 4NH3
C. N2 + H2 ------> NH3
D. 3N2 + 4H2 ------> 6NH3
Which of the following states the law of conservation of mass?
A. Atoms are rearranged in a reaction and join to form new molecules.
B. Compounds form a new compound with different properties.
C. Mass cannot be created or destroyed in a chemical reaction.
D. Energy is neither created nor destroyed in a chemical reaction.
Nitrogen dioxide is a covalent compound. How many oxygen atoms are in a nitrogen dioxide molecule?
A. 3
B. 2
C. 1
D. 0
An ion is
A. a chemical reaction that produces gas and a precipitate.
B. a chemical reaction that involves nonmetals.
C. a nonmetal compound with too many electrons.
D. an atom that gains or loses electrons during a chemical reaction.
Which of the following will NOT increase the rate of a chemical reaction?
A. adding a catalyst
B. increasing the surface area of a solid reactant
C. increasing the concentration of reactants
D. adding an inhibitor
Which of the following chemical equations shows an endothermic reaction?
A. 2H2 + O2 ------> 2H2O + energy
B. 2Na + Cl2 ------> 2NaCl + energy
C. 2H2O + energy ------> 2H2 + O2
D. C + O2 ------> CO2 + energy
Which of the following is NOT an example of a chemical reaction?
A. milk turning sour
B. food being digested
C. a match burning
D. ice melting
Which of the following phrases describes a catalyst?
A. slows the rate of a reaction
B. increases the energy given off by a reaction
C. lowers the activation energy of a reaction
D. changes permanantly when used in a reaction
Which of the following examples shows where a coefficient is used correctly to balance the equation?
A. Na + Cl2 ------> 2NaCl
B. Na + 2Cl2 ------> 2NaCl
C. 2Na + Cl2 ------> 2NaCl2
D. 2Na + Cl2 ------> 2NaCl
In which kind of chemical reaction do two or more substances combine to form one new compound?
A. synthesis reaction
B. decomposition reaction
C. single-displacement reaction
D. double-displacement reaction
Which of the following is an example of a chemical reaction?
A. a tire losing air
B. water boiling
C. a solid forming in solution
D. ice melting
What is O2 an example of?
A. chlorophyll
B. diatomic molecule
C. ionic bond
D. sulfuric acid
Which of the following equations is an example of a single-displacement reaction?
A. Fe + 2HCl ------> FeCl2 + H2
B. 2Mg + O2 ------> 2MgO
C. 2H2O2 ------> 2H2O + O2
D. NaOH + HCl ------> NaCl + H2O
How can the rate of a reaction be increased?
A. by decreasing the concentration of the reactants
B. by grinding a solid reactant into a powder
C. by lowering the temperature of the reactants
D. by raising the temperature of the products
How can you be sure a chemical reaction is happening?
A. A solid dissolves.
B. A new substance is formed.
C. Water turns to steam.
D. A mixture is made.
Which of the following is an example of a diatomic molecule?
A. O2
B. CO2
C. H2O2
D. O3
What does a prefix in a chemical formula represent in an element?
A. number of atoms
B. number of chemicals
C. number of molecules
D. number of elements
Which of the following usually increases the rate of a reaction?
A. changing the properties of the reactants
B. raising the temperature of the reactants
C. lowering the temperature of the reactants
D. raising the temperature of the products
Which of the following chemical reactions illustrates a decomposition reaction?
A. 2H2O ------> 2H2 + O2
B. 4H2 + 2O2 ------> 2H2O
C. 6CO2 + 6H2O + energy ------> C6H12O6 + 6O2
D. 4KI + 2Cl2 ------> 4KCl + 2I2
Which of the following chemical reactions illustrates an endothermic reaction?
A. CaCO3 ------> CaO + O2
B. 4H2 + 2O2 ------> 2H2O
C. 6CO2 + 6H2O + energy ------> C6H12O6 + 6O2
D. 4KI + 2Cl2 ------> 4KCl + 2I2
Which of the following is an example of chemical bonds breaking?
A. An explosive breaks rocks in a mine.
B. A person breaks rocks with a hammer.
C. Frost wedging breaking rocks due to freezing.
D. Low temperatures cause icicles to form.
something that is needed to break chemical bonds in reactants
A. activation energy
B. catalyst
C. energy
D. inhibitor
E. rate of reaction
the smallest amount of energy needed to start a chemical reaction
A. activation energy
B. catalyst
C. energy
D. inhibitor
E. rate of reaction
the speed at which new particles form in a chemical reaction
