If someone could please help me with these few Chemistry Question It would really help me!!
1) An atom with a mass number of 80, and an atomic number of 35 has:
A) 35 protons, and 35 neutrons
B) 35 protons, and 80 neutrons
C)45 protons, and 35 neutrons
D) 35 protons, and 45 neutrons
2) Given the skeleton equation: NH3 + O2 --> N2 + H2O Which is the correct balanced chemical equation for the reaction?
A)NH3 + O2 --> N2 + H2O
B) 2NH3 + O2 --> N2 + 3H2O
C) N2H6 + O2 --> N2 + H6O2
D) 4NH3 + 3O2 --> 2N2 + 6H2O
3) Identify the type of chemical reaction: copper + silver nitrate --> copper(II) nitrate + silver
A) synthesis
B) decomposition
C) single displacement
D) double displacement
4) In a single displacement reaction to determine if magnesium, Mg, would replace calcium, Ca, in calcium chloride, CaCl2, you would:
A) use the solubility rules.
B) see which one has a larger atomic number.
C) use the Activity Series.
D) just assume it would, there is no way to know for sure.
5) If a lit wooden split inserted into a test tube, with a chemical reaction occurring, produces a “pop” sound. That is a positive test for:
A) oxygen gas
B) hydrogen gas
C) helium gas
D)carbon dioxide gas
6) Elements produce an emission spectrum when:
A) energized electrons jump up to a higher energy level.
B) they lose electrons.
C) energized electrons drop from a higher energy level to a lower energy level.
D) they gain electrons.
7) Which of the following elements could you use a flame test to help identify:
A) oxygen
B) lithium
C) helium
D)all of the above
8) Precipitation reactions are based on the fact that:
A) some metals are more reactive than others
B) both products of the reaction must be soluble in water
C) cations can be soluble or insoluble based on the anion present
D) all compounds dissociate in water
Thank you VERY MUCH!
1) An atom with a mass number of 80, and an atomic number of 35 has:
A) 35 protons, and 35 neutrons
B) 35 protons, and 80 neutrons
C)45 protons, and 35 neutrons
D) 35 protons, and 45 neutrons
2) Given the skeleton equation: NH3 + O2 --> N2 + H2O Which is the correct balanced chemical equation for the reaction?
A)NH3 + O2 --> N2 + H2O
B) 2NH3 + O2 --> N2 + 3H2O
C) N2H6 + O2 --> N2 + H6O2
D) 4NH3 + 3O2 --> 2N2 + 6H2O
3) Identify the type of chemical reaction: copper + silver nitrate --> copper(II) nitrate + silver
A) synthesis
B) decomposition
C) single displacement
D) double displacement
4) In a single displacement reaction to determine if magnesium, Mg, would replace calcium, Ca, in calcium chloride, CaCl2, you would:
A) use the solubility rules.
B) see which one has a larger atomic number.
C) use the Activity Series.
D) just assume it would, there is no way to know for sure.
5) If a lit wooden split inserted into a test tube, with a chemical reaction occurring, produces a “pop” sound. That is a positive test for:
A) oxygen gas
B) hydrogen gas
C) helium gas
D)carbon dioxide gas
6) Elements produce an emission spectrum when:
A) energized electrons jump up to a higher energy level.
B) they lose electrons.
C) energized electrons drop from a higher energy level to a lower energy level.
D) they gain electrons.
7) Which of the following elements could you use a flame test to help identify:
A) oxygen
B) lithium
C) helium
D)all of the above
8) Precipitation reactions are based on the fact that:
A) some metals are more reactive than others
B) both products of the reaction must be soluble in water
C) cations can be soluble or insoluble based on the anion present
D) all compounds dissociate in water
Thank you VERY MUCH!
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1D) 35 protons, and 45 neutrons
2D) 4NH3 + 3O2 --> 2N2 + 6H2O
3D) double displacement
4C) use the Activity Series.
5B) hydrogen gas
6C) energized electrons drop from a higher energy level to a lower energy level.
7B) lithium
8C) cations can be soluble or insoluble based on the anion present
2D) 4NH3 + 3O2 --> 2N2 + 6H2O
3D) double displacement
4C) use the Activity Series.
5B) hydrogen gas
6C) energized electrons drop from a higher energy level to a lower energy level.
7B) lithium
8C) cations can be soluble or insoluble based on the anion present