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Q 1/63
Score 0
What does it mean for a chemical equation to be balanced?
30
It means that there are different amounts of atoms on either side of the equation.
It means that there are the same number of atoms of each element on both sides of the equation.
It means that the weight is the same for each element.
It means that the equation looks the same on both sides of the equation.
Q 2/63
Score 0
Is the equation "2H₂ + O₂ → H₂O" balanced?
30
Unbalanced
Balanced
63 questions
Q.
What does it mean for a chemical equation to be balanced?
1
30 sec
Q.
Is the equation "2H₂ + O₂ → H₂O" balanced?
2
30 sec
Q.
How many oxygen atoms are on each side of the unbalanced equation "CH₄ + O₂ → CO₂ + H₂O"?
3
30 sec
Q.
If a chemical equation is unbalanced, is it a true representation of a chemical reaction?
4
30 sec
Q.
In the equation "2Na + Cl₂ → 2NaCl," is the equation balanced?
5
30 sec
Q.
How many chlorine atoms are on each side of the balanced equation "2Na + Cl₂ → 2NaCl"?
6
30 sec
Q.
Is the equation "N₂ + H₂ → NH₃" balanced?
7
30 sec
Q.
How many nitrogen atoms are on each side of the unbalanced equation "N₂ + H₂ → NH₃"?
8
30 sec
Q.
What element is unbalanced in the equation "C₆H₁₂O₆ → CO₂ + H₂O"?
9
30 sec
Q.
In the balanced equation "4Fe + 3O₂ → 2Fe₂O₃," how many iron (Fe) atoms are on the left side?
10
30 sec
Q.
Is the equation "3Mg + N₂ → Mg₃N₂" balanced?
11
30 sec
Q.
How many magnesium atoms are on each side of the balanced equation "3Mg + N₂ → Mg₃N₂"?
12
30 sec
Q.
In the unbalanced equation "H₂ + O₂ → H₂O," how many hydrogen atoms are on the left side?
13
30 sec
Q.
In a chemical equation, what is the term for substances that are present at the beginning of a chemical reaction?
14
30 sec
Q.
Which of the following is an example of a physical change?
15
30 sec
Q.
Which of the following is an example of a chemical change?
16
30 sec
Q.
What is the mass of products or reactants if the chemical equation follows the law of conservation of matter?
17
30 sec
Q.
Which of the following is an example of a chemical reaction?
18
30 sec
Q.
Why is there no mass change during chemical reactions?
19
30 sec
Q.
4 grams of hydrogen reacts with some oxygen to make 36 grams of water. Figure out how much oxygen must have been used by applying the law of conservation of mass?
20
30 sec
Q.
If 10g of Carbon and 2g of Oxygen go into a chemical equation, what will be the total mass of the products?
21
30 sec
Q.
In the chemical reaction CaCO3 --> CaO + CO2, the products are best classified as –
22
30 sec
Q.
A chemical reaction in which calcium carbonate, CaCO3, is decomposed, results in the production of two simpler compounds. What mass of calcium carbonate is decomposed in this reaction? CaCO3 (?g) --> CaO (28.00 g) + CO2 (21.97 g)
23
30 sec
Q.
Which groups (columns) on the periodic table are the most reactive and why?
24
30 sec
Q.
A stack of logs with a mass of 30 kg is burned using 1 kg of fire. 28 kg of ash is produced in the reaction. Where did the missing mass of the reactants likely go?
25
30 sec
Q.
16 g of Methane is chemically combined with 64 g of Oxygen. Carbon Dioxide and 36 g of water is produced . How many grams of Carbon Dioxide was produced as a product?
26
30 sec
Q.
A student observes some sugar as it is heated and burns. The student concludes that a chemical reaction has occurred. Which of the following observations about the burning sugar provides evidence of a chemical reaction?
27
30 sec
Q.
Based on the reaction shown, which statement best SUPPORTS the Law of Conservation of Mass? Zn + 2HCl -----> ZnCl2 + H2
28
30 sec
Q.
How many elements are found in NaCl?
29
30 sec
Q.
When you chew, the particles of food are broken down before they are swallowed. How would you describe this kind of change?
30
30 sec
Q.
Chemicals on the left of an equation that react are called --
31
30 sec
Q.
A rectangular block of copper metal weighs 1890 g. The dimensions of the block are 8 cm x 5 cm x 5 cm. From this data, what is the density of copper?
32
30 sec
Q.
Which of these is NOT a sign that a chemical change has occurred?
33
30 sec
Q.
Which of the following IS a physical change?
34
30 sec
Q.
Which of the following is evidence of a chemical reaction?
35
30 sec
Q.
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
36
30 sec
Q.
Which of the following is an example of a chemical change?
37
30 sec
Q.
Which of the following is an example of a physical change?
38
30 sec
Q.
Which of the following is a sign of a chemical change?
39
30 sec
Q.
Which of the following is NOT a sign of a chemical change?
40
30 sec
Q.
Which of the following best defines a chemical change?
41
30 sec
Q.
Which of the following is an example of a chemical change?
42
30 sec
Q.
Which of the following is a sign of a chemical change?
43
30 sec
Q.
Which of the following is a characteristic of a chemical change?
44
30 sec
Q.
Which group on the periodic table contains elements that are all noble gases?
45
30 sec
Q.
Which period on the periodic table contains the element oxygen?
46
30 sec
Q.
Which group on the periodic table contains elements that are all halogens?
47
30 sec
Q.
How many valence electrons does an atom of carbon have?
48
30 sec
Q.
What does the period of an element tell you?
49
30 sec
Q.
What does the period number represent in the periodic table?
50
30 sec
Q.
What information does the period number provide about an element?
51
30 sec
Q.
What is the atomic number of carbon?
52
30 sec
Q.
What does the atomic number of an element tell you?
53
30 sec
Q.
What does the atomic number of an element represent?
54
30 sec
Q.
Which element has an atomic number of 6?
55
30 sec
Q.
What does the atomic number of an element indicate?
56
30 sec
Q.
Which of the following is a characteristic of non-metals?
57
30 sec
Q.
Which of the following is NOT a characteristic of nonmetals?
58
30 sec
Q.
Which of the following is NOT a property of nonmetals?
59
30 sec
Q.
What is the formula for density?
60
30 sec
Q.
Which of the following is NOT a method to increase the density of an object?
61
30 sec
Q.
Which of the following is NOT a unit of density?
62
30 sec
Q.
Which of the following materials is less dense than water?
