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Q 1/55
Score 0
A chemical reaction may be sped up by:
30
heating the reactants
using more concentrated reactants
using more finely ground reactants
all of the above
Q 2/55
Score 0
A Precipitate is:
30
A substance dissolved in a liquid
A rocky edge
A change in solution colour during a chemical change
A solid formed from a chemical reaction
55 questions
Q.
A chemical reaction may be sped up by:
1
30 sec
Q.
A Precipitate is:
2
30 sec
Q.
Complete the following chemical reaction: zinc + copper chloride -> copper + ?
3
30 sec
Q.
A catalyst
4
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Q.
In a reaction with hydrochloric acid, powdered magnesium reacts faster than the same mass of magnesium ribbon. Why is this?
5
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Q.
Which of the following is a chemical change?
6
30 sec
Q.
Chopping vegetables before cooking increases their reaction rate. The factor that helps with the increase in the reaction rate is _____.
7
30 sec
Q.
In the chemical reaction: iron + sulfur -> iron sulfide
8
30 sec
Q.
Marble reacts with hydrochloric acid to produce calcium chloride, water and carbon dioxide. In which of these mixtures is the rate of reaction likely to be the greatest?
9
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Q.
The following is an example of which reaction? CH4 + O2(g) -> CO2(g) + H2O(g)
10
30 sec
Q.
The following is an example of which reaction? MgBr2(aq) + NaCl(aq) -> MgCl2(aq) + NaBr(aq)
11
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Q.
The following is an example of what type of reaction? Lead nitrate reacts with potassium iodide to form lead iodide and potassium nitrate.
12
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Q.
Consider the reaction represented by the chemical equation: NO3(aq) + NaCl(s) -> NO3Cl(aq) + Na(s) What type of chemical reaction is this?
13
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Q.
The following is an example of which reaction? NH3(l) + H20(l) -> NH4OH(aq)
14
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Q.
Consider the reaction represented by the chemical equation: AgNO3(aq) + NaCl(s) -> AgCl(s) + NaNO3(aq) What are the products?
15
30 sec
Q.
In the following single-displacement reaction, what would be the second product formed? Na + LiCl2 -> Li + ______
16
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Q.
Consider the reaction represented by the chemical equation: AgNO3(aq) + NaCl(s) -> AgCl(s) + NaNO3(aq) What are the reactants?
17
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Q.
A chemical reaction is where
18
30 sec
Q.
During a chemical reaction,
19
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Q.
An equation is balanced by
20
30 sec
Q.
What are the reactants in the following chemical equation: Zn + CuSO4 -----> ZnSO4 + Cu
Balance the reaction: ___CaCO3 + ____HCl ------>___CaCl2 + ____H2CO3
23
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Q.
Balance the reaction: __Zn + ___H2SO4 -----> ____ZnSO4 + ___H2
24
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Q.
Vinegar is added to baking soda and bubbles of carbon dioxide rapidly form. A cloudy liquid is left behind. What are products in this chemical reaction?
25
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Q.
How does the number and kind of atoms involved as reactants in a chemical reaction compare to the number and kind of atoms in the products?
26
30 sec
Q.
What has happened to the atoms of the reactants?
27
30 sec
Q.
If four carbon atoms combine with oxygen to form carbon dioxide molecules, how many carbon atoms will be found in the product?
28
30 sec
Q.
Students measure 2 g of baking soda and 5 g of vinegar. They mix them together in a beaker and watch bubbles form. The mass of the results liquid is 6.7 g. Based on the Law of Conservation of Mass, what should the mass of the gas that escaped be?
29
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Q.
The Law of Conservation of Mass states that matter is not gained or lost in a chemical reaction. Which of the following correctly restates this law? In a chemical reaction
30
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Q.
A student uses clay to model the conservation of mass. First, she finds the mass of a block of clay on a balance. Then she molds the clay into a different shape, without adding or removing clay. She masses it again. How will her results model this law?
31
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Q.
This law states the mass of reactants has to be equal to the mass of the products.
32
30 sec
Q.
Which of the following is a chemical change?
33
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Q.
Which of the following is NOT a chemical change?
34
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Q.
What are the coefficients that will balance this reaction? ___ HCl (aq) + ___ Mg(OH)2 (aq) → ___ H2O (l) + ___MgCl2 (aq)
35
30 sec
Q.
What is the “x” in the following equation? C5H12 + _x_ O2 → 5 CO2 + 6H2O
36
30 sec
Q.
Which product is missing from this single replacement reaction?
Cu (s) + H2SO4 (aq) → CuSO4 (aq) + ???
37
30 sec
Q.
When an element is reduced, its atoms
38
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Q.
A chemical change is different than a physical change because in a chemical change
39
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Q.
In a chemical reaction
40
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Q.
In the chemical reaction CH4 + 2O2 → CO2 + 2H2O. If you count the atoms in the reactants, there are
41
30 sec
Q.
In a chemical reaction, mass is conserved. This means that
42
30 sec
Q.
If the reactants on the left side of a chemical equation are C3H8 + 5O2, the products in a balanced equation could be
43
30 sec
Q.
One clue of a chemical change is the formation of a precipitate. A precipitate is formed when
44
30 sec
Q.
In a chemical reaction, if the reactants are heated, the reaction usually happens
45
30 sec
Q.
Some chemical reactions require a substance called a catalyst. The main purpose of a catalyst is
46
30 sec
Q.
If two substances react and the temperature of the mixture increases, the reaction is
47
30 sec
Q.
If two substances react and the temperature of the mixture decreases, the reaction is
48
30 sec
Q.
If a reaction is exothermic,
49
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Q.
If a reaction is endothermic,
50
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Q.
In a chemical reaction, no new atoms are created, and no atoms are destroyed.
51
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Q.
In a chemical reaction, only the atoms present in the _________ can end up in the products.
52
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Q.
A catalyst slows down the rate of reaction to make better products.
53
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Q.
A catalyst does not actually become part of the products of a chemical reaction.
54
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Q.
In a _______________ chemical reaction,the type and number of atoms are the same on both sides of a chemical equation.
