When iron rusts and forms iron oxide, iron oxide has more mass than 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 contains oxygen atoms, unlike pure iron.
A molecule of calcium oxide, CaO, and a molecule of carbon dioxide, CO2, combine in a chemical reaction to form a single substance. Knowing that matter is neither created nor destroyed, what chemical formula is the product of this reaction?
***CaCO3
CaCO2
Ca2CO3
Ca2O3
Which statement correctly explains why the ashes of the burnt paper have less mass than the original paper?
Ash is created from new atoms that have less mass than paper.
Other atoms combine with the paper to produce ash.
***Some of the atoms in the paper have become 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
What combination of molecules will produce ammonia without residues?
Ash is created from new atoms that have less mass than paper.
Other atoms combine with the paper to produce ash.
***Some of the atoms in the paper have become gases.
Some of the atoms in the paper are destroyed when it burns.
In the equation
2H2 + 1O2 →→ 2H2O
if you change the 2H2 molecules to 3H2 and balance the equation, which statement is correct?
***The equation will produce three water molecules.
The result of the equation will be the same.
It is not possible to produce water without remaining molecules.
Each molecule of oxygen will combine with 2 molecules of hydrogen with no remaining molecules. 1. Iron oxide has oxygen atoms, and pure iron does not
2. CaCO3
3. Some of the atoms in the paper have become gases
4. 2N2 and 6H2
5. It is not possible to produce water without remains of molecules Darth Relyt is the correct fixed version
issue 1
When iron rusts and forms iron oxide, iron oxide has more mass than 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 contains oxygen atoms, unlike pure iron.
issue 2
A molecule of calcium oxide, CaO, and a molecule of carbon dioxide, CO2, combine in a chemical reaction to form a single substance. Knowing that matter is neither created nor destroyed, what chemical formula is the product of this reaction?
***CaCO3
CaCO2
Ca2CO3
Ca2O3
issue 3
Which statement correctly explains why the ashes of the burnt paper have less mass than the original paper?
Ash is created from new atoms that have less mass than paper.
Other atoms combine with the paper to produce ash.
***Some of the atoms in the paper have become gases.
Some of the atoms in the paper are destroyed when it burns.
issue 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
What combination of molecules will produce ammonia without residues?
5N2 and 6H2
***2N2 and 6H2
4N2 and 4H2
8N2 and 4H2
issue 5
In the equation
2H2 + 1O2 →→ 2H2O
if you change the 2H2 molecules to 3H2 and balance the equation, which statement is correct?
***The equation will produce three water molecules.
The result of the equation will be the same.
It is not possible to produce water without remaining molecules.
Each molecule of oxygen will combine with 2 molecules of hydrogen with no remaining molecules. Pls @Drbob you act like they committed a crime just because they didn't number it - Please grow up Thanks @Darth_Relyt, 100% correct Thanks @Darth_Relyt, 100% correct!!! sorry for not numbering the questions @darth Relyt still correct as of 11/09/21 Darth Relyt is still correct as of 11/10/2021 Just take the time to read Dark's answers They move them around so answer lettering doesn't work normally work. Dark Relyt's answers are still correct 2 years later, thanks sm I got completely different answers, mine were (as of 11/24/21 for Connexus)
1. One
2.C
3.B
4.C
5. B You will notice that I corrected it and answered questions that had appropriate answers to choose from. Sorry but please stop. It would be MUCH EASIER if you numbered each problem and each answer choice like this.
1. When iron rusts and forms iron oxide, iron oxide has more mass than 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.
vs. The oxygen atoms in iron oxide have more mass than the iron atoms in pure iron.
***D. Iron oxide contains oxygen atoms, unlike pure iron.
I don't see ANY good answer here.
2. A molecule of calcium oxide, CaO, and a molecule of carbon dioxide, CO2, combine in a chemical reaction to form a single substance. Knowing that matter is neither created nor destroyed, what chemical formula is the product of this reaction?
***a. CaCO3
b. CaCO2
vs. Ca2CO3
D. Ca2O3
I agree
3. Which statement correctly explains why the ashes of the burnt paper have less mass than the original paper?
a. Ash is created from new atoms that have less mass than paper.
b. Other atoms combine with the paper to produce ash.
***vs. Some of the atoms in the paper have become gases.
D. Some of the atoms in the paper are destroyed when it burns.
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
What combination of molecules will produce ammonia without residues?
Ash is created from new atoms that have less mass than paper.
Other atoms combine with the paper to produce ash.
***Some of the atoms in the paper have become gases.
Some of the atoms in the paper are destroyed when it burns.
Oops. You copied the choices from the previous problem here.
5. In the equation
2H2 + 1O2 →→ 2H2O
if you change the 2H2 molecules to 3H2 and balance the equation, which statement is correct?
***a. The equation will produce three water molecules.
b The result of the equation will be the same.
vs. It is not possible to produce water without remaining molecules.
D. Each molecule of oxygen will combine with 2 molecules of hydrogen with no remainder
I agree.
@darth Relyt is right it is
1.D
2.D
3. One
4. One
5.D