Physical Science 10A U4L5

When iron rusts and forms iron oxide, the iron oxide has more mass than the iron. Which statement correctly explains this observation?

The iron atoms in iron oxide have more mass than pure iron.
There are more iron atoms in iron oxide than in pure iron.
The oxygen atoms in iron oxide have more mass than the iron atoms in pure iron.
***Iron oxide has oxygen atoms, and pure iron does not.

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 is the product of this reaction?

***CaCO3
CaCO2
Ca2CO3
Ca2O3

Which statement correctly explains why the ashes of burnt paper have less mass than the original paper?

The ash is created from new atoms that have less mass than the paper.
Other atoms combine with the paper to produce the ash.
***Some of the atoms in the paper became gases.
Some of the atoms in the paper are destroyed when it burns.

It takes 1 molecule of nitrogen and 3 molecules of hydrogen to produce 2 molecules of ammonia using the following formula:
1N2 + 3H2 → 2NH3
Which combination of molecules will produce ammonia with no leftovers?

The ash is created from new atoms that have less mass than the paper.
Other atoms combine with the paper to produce the ash.
***Some of the atoms in the paper became gases.
Some of the atoms in the paper are destroyed when it burns.

In the equation
2H2 + 1O2 →→ 2H2O
if you change the 2H2 to 3H2 molecules and balance the equation, which statement is correct?

***The equation will produce three molecules of water.
The result of the equation will be the same.
It is not possible to produce water without leftover molecules.
Each oxygen molecule will combine with 2 hydrogen molecules with no leftover molecules.

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  1. It would be SO MUCH EASIER if you would number each problem as well as each answer choice like this.
    1. When iron rusts and forms iron oxide, the iron oxide has more mass than the iron. Which statement correctly explains this observation?

    a.The iron atoms in iron oxide have more mass than pure iron.
    b. There are more iron atoms in iron oxide than in pure iron.
    c. The oxygen atoms in iron oxide have more mass than the iron atoms in pure iron.
    ***d. Iron oxide has oxygen atoms, and pure iron does not.
    I don't see ANY good answers here.

    2. 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 is the product of this reaction?

    ***a. CaCO3
    b. CaCO2
    c. Ca2CO3
    d. Ca2O3
    I agree
    3. Which statement correctly explains why the ashes of burnt paper have less mass than the original paper?

    a. The ash is created from new atoms that have less mass than the paper.
    b. Other atoms combine with the paper to produce the ash.
    ***c. Some of the atoms in the paper became gases.
    d. Some of the atoms in the paper are destroyed when it burns.
    Both a and b are correct.

    4. It takes 1 molecule of nitrogen and 3 molecules of hydrogen to produce 2 molecules of ammonia using the following formula:
    1N2 + 3H2 → 2NH3
    Which combination of molecules will produce ammonia with no leftovers?

    The ash is created from new atoms that have less mass than the paper.
    Other atoms combine with the paper to produce the ash.
    ***Some of the atoms in the paper became gases.
    Some of the atoms in the paper are destroyed when it burns.
    Oops. You copied the previous problem's choices here.
    5. In the equation
    2H2 + 1O2 →→ 2H2O
    if you change the 2H2 to 3H2 molecules and balance the equation, which statement is correct?

    ***a. The equation will produce three molecules of water.
    b The result of the equation will be the same.
    c. It is not possible to produce water without leftover molecules.
    d. Each oxygen molecule will combine with 2 hydrogen molecules with no leftover
    I agree.

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  2. sorry for not numbering the questions

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  3. Pls @Drbob your acting like they did a crime just because they didn’t number it- Grow up pls

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  4. Sorry but stop please

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  5. fixed version

    Question 1
    When iron rusts and forms iron oxide, the iron oxide has more mass than the iron. Which statement correctly explains this observation?

    The iron atoms in iron oxide have more mass than pure iron.
    There are more iron atoms in iron oxide than in pure iron.
    The oxygen atoms in iron oxide have more mass than the iron atoms in pure iron.
    ***Iron oxide has oxygen atoms, and pure iron does not.

    Question 2
    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 is the product of this reaction?

    ***CaCO3
    CaCO2
    Ca2CO3
    Ca2O3

    Question 3
    Which statement correctly explains why the ashes of burnt paper have less mass than the original paper?

    The ash is created from new atoms that have less mass than the paper.
    Other atoms combine with the paper to produce the ash.
    ***Some of the atoms in the paper became gases.
    Some of the atoms in the paper are destroyed when it burns.

    Question 4
    It takes 1 molecule of nitrogen and 3 molecules of hydrogen to produce 2 molecules of ammonia using the following formula:
    1N2 + 3H2 → 2NH3
    Which combination of molecules will produce ammonia with no leftovers?

    5N2 and 6H2
    ***2N2 and 6H2
    4N2 and 4H2
    8N2 and 4H2

    Question 5
    In the equation
    2H2 + 1O2 →→ 2H2O
    if you change the 2H2 to 3H2 molecules and balance the equation, which statement is correct?

    ***The equation will produce three molecules of water.
    The result of the equation will be the same.
    It is not possible to produce water without leftover molecules.
    Each oxygen molecule will combine with 2 hydrogen molecules with no leftover molecules.

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  6. You will notice I fixed it as well as answering those questions that had appropriate answers from which to choose.

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  7. 1. Iron oxide has oxygen atoms, and pure iron does not
    2. CaCO3
    3. Some of the atoms in the paper became gases
    4. 2N2 and 6H2
    5. It is not possible to produce water without leftover molecules

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  8. Darth Relyt is correct

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  9. Thanks @Darth_Relyt, 100% correct

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  10. Thank you @Darth_Relyt, 100% correct!!!

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  11. @darth Relyt is correct it's
    1. D
    2. D
    3. A
    4. A
    5. D

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  12. @ darth Relyt still correct as of 11/9/21

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  13. Darth Relyt is still correct as of 11/10/2021

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  14. I got completely different answers, mine were (As of 11/24/21 for Connexus)

    1. A
    2. C
    3. B
    4. C
    5. B

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