The skeleton chemical equation for the reaction between zinc metal and hydrochloric acid is shown. What change needs to be made in order to balance this reaction equation?
Zn + HCl → ZnCl2 + H2
2 points
2
Question 2
2.
Examine the following reaction, then identify the reactants and products:
H2O2 --> H2O + O2
O2
H2O
H2O2
Reactant(s)
Product(s)
Required
2 points
2
Question 3
3.
Identify the reaction type: Ca + 2HCl → CaCl2 + H2
Required
2 points
2
Question 4
4.
Identify the reaction type: 2Na + Cl2 → 2NaCl
Required
2 points
2
Question 5
5.
Identify the reaction type: CH4 + 2O2 → CO2 + 2H2O
When two solutions are mixed and a cloudy substance forms, it is called a
PRECIPITATE. Which substance is the precipitate in the reaction above?
Required
1 point
1
Question 10
10.
Is it possible to have a chemical reaction where there is only one reactant?
Required
1 point
1
Question 11
11.
If a gas is produced in a chemical reaction, does that gas count as a product?
Required
2 points
2
Question 12
12.
Based on the understanding of the way the metals are placed in the activity series, the student correctly predicted the outcome of four reactions. According to the student, which reactions are most likely to take place? Select all that apply.
Required
3 points
3
Question 13
13.
Balance the Equation(use the format of 2, 4, 1,3)
____N2 + ____O2 + ____H2O → ____HNO3
3 points
3
Question 14
14.
Balance the Equation(use the format of 2, 4, 1)
____Al + _____Br2 → ____AlBr3
Required
2 points
2
Question 15
15.
The reactants for a certain chemical reaction are shown. Cu(NO3)2 + NaOH → Which of the following shows the correct product or products of this reaction?
Required
2 points
2
Question 16
16.
What is the main product of the reaction between magnesium and oxygen?
Required
0 points
0
Question 17
17.
Students want to gather evidence for the claim that the number of atoms before a chemical reaction is equal to the number of atoms after the chemical reaction. They decide to react vinegar and baking soda in a sealed plastic bag. Which of the following would provide the evidence the students need?
Required
2 points
2
Question 18
18.
Which of the following is true regarding the atoms involved in a chemical reaction?
Required
2 points
2
Question 19
19.
Match the metal with its possible reaction product. (Some of these might be NR based on activity series-)
Draggable item
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Corresponding Item
Aluminum with copper sulfate
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Barium chloride and hydrogen gas
Barium with hydrochloric acid
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Zinc sulfate and magnesium metal
Zinc with magnesium sulfate
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Aluminum sulfate and copper metal
Required
2 points
2
Question 20
20.
Match the nonmetal with its expected reaction product.
Draggable item
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Corresponding Item
Oxygen with iron sulfide
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Iron oxide and sulfur dioxide
Fluorine with potassium iodide
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Potassium fluoride and iodine
Chlorine with sodium bromide
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Sodium chloride and bromine
Required
2 points
2
Question 21
21.
Match these metals with their activity series positions.
Draggable item
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Corresponding Item
Copper
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More reactive than copper
Aluminum
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Less reactive than aluminum
Zinc
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More reactive than zinc
Required
2 points
2
Question 22
22.
Identify the reaction types based on these metals.