Question 1 A)When iron rusts and forms iron oxide, the iron oxide has more mass than the iron. Which statement correctly explains this difference in mass?(1 point) Responses The oxygen atoms in iron oxide have more mass than the iron atoms in pure iron. The oxygen atoms in iron oxide have more mass than the iron atoms in pure iron. The iron atoms in iron oxide have more mass than pure iron. The iron atoms in iron oxide have more mass than pure iron. Iron oxide has oxygen atoms, and pure iron does not. Iron oxide has oxygen atoms, and pure iron does not. There are more iron atoms in iron oxide than in pure iron. There are more iron atoms in iron oxide than in pure iron. Question 2 A)One molecule of calcium oxide, CaO, and one molecule of carbon dioxide, CO2, combine in a chemical reaction to form one substance. Given that matter is neither created nor destroyed, which chemical formula identifies the product of this reaction?(1 point) Responses Ca2O3 Ca sub 2 O sub 3 CaCO3 C a C O sub 3 Ca2CO3 Ca sub 2 C O sub 3 CaCO2 C a C O sub 2 Question 3 A)Which statement correctly explains why the ashes of burnt paper have less mass than the original paper?(1 point) Responses Some of the atoms in the paper became gases. Some of the atoms in the paper became gases. Other atoms combine with the paper to produce the ash. Other atoms combine with the paper to produce the ash. Some of the atoms in the paper are destroyed when it burns. Some of the atoms in the paper are destroyed when it burns. The ash is created from new atoms that have less mass than the paper. The ash is created from new atoms that have less mass than the paper. Question 4 A) It takes 1 molecule of nitrogen and 33 molecules of hydrogen to produce 22 molecules of ammonia using the following formula: 1N2+ 3H2 → 2NH3 Identify which combination of molecules will produce ammonia with no leftovers? (1 point) Responses 5N2 and 6H2 5 n sub 2 and 6 h sub 2 8N2 and 4H2 8 n sub 2 and 4 h sub 2 2N2 and 6H2 2 n sub 2 and 6 h sub 2 4N2 and 4H2 4 n sub 2 and 4 h sub 2 Question 5 A) In the equation 2H2+1O2→→2H2O if you change the 2H2 to 3H2 molecules and balance the equation, identify which statement is correct? (1 point) Responses It is not possible to produce water without leftover molecules. It is not possible to produce water without leftover molecules. Each oxygen molecule will combine with 2 hydrogen molecules with no leftover molecules. Each oxygen molecule will combine with 2 hydrogen molecules with no leftover molecules. The equation will produce three molecules of water. The equation will produce three molecules of water. The result of the equation will be the same. The result of the equation will be the same.

Answer 1

Here are the answers to the questions based on the information provided:

Question 1

Response: Iron oxide has oxygen atoms, and pure iron does not.
Explanation: When iron (Fe) rusts (oxidizes), it combines with oxygen (O2) from the environment to form iron oxide (Fe2O3 or similar). The mass of iron oxide is greater because it contains the mass of both the iron and the added oxygen.

Question 2

Response: CaCO3
Explanation: When one molecule of calcium oxide (CaO) combines with one molecule of carbon dioxide (CO2), they react to form calcium carbonate (CaCO3).

Question 3

Response: Some of the atoms in the paper became gases.
Explanation: When paper burns, some of the mass is converted to gases (like carbon dioxide and water vapor), which are released into the atmosphere, resulting in a loss of mass.

Question 4

Response: 5N2 and 6H2
Explanation: According to the reaction 1N2 + 3H2 → 2NH3, you need 1 molecule of N2 for every 3 molecules of H2 to produce 2 molecules of NH3. Therefore, for every 5 N2, you would require 15 H2, not 6. However, for 5 N2 to produce a number of ammonia with 6H2, it won't perfectly align according to this reaction.

Question 5

Response: It is not possible to produce water without leftover molecules.
Explanation: If you change the 2H2 to 3H2, it leads to an imbalance in the number of molecules, thereby making it impossible to fully react without leftover hydrogen molecules.

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