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1.
supervisor - this looks like a homework assignment. It consists of multiple questions. It maybe best if you break the questions up into seperate questions.
Ethanol contains the elements carbon, hydrogen, and oxygen. When ethanol burns, it chemically reacts with oxygen gas.
C2H6O+O2ethanoloxygen gas What elements will be present in the substances that are created when ethanol burns?
A.carbon and hydrogen onlyB.the elements cannot be determinedC.nitrogen, sulfur, and sodium onlyD.carbon, hydrogen, and oxygen only
2.When iron reacts with oxygen, it forms iron oxide, or rust.
4 Fe + 3 O2 2 Fe2O3 If 112 g of iron (Fe) combines with 24 g of oxygen (O2), how much iron oxide is formed?
A.136 g Fe2O3B.112 g Fe2O3C.24 g Fe2O3D.88 g Fe2O3
3.In a chemical reaction, the total mass of the reactants is 10.0 grams. After the reaction, the total mass of the products must be:
A.exactly 20.0 grams.B.more than 10.0 grams.C.less than 10.0 grams.D.exactly 10.0 grams.
4.What chemical elements does this reaction contain?
C + O2 CO2
A.carbon and oxygenB.carbon, oxygen, and carbon dioxideC.calcium and oxygenD.calcium, oxygen, and calcium dioxide
5.Which of the following is the correct way to write the chemical symbol for sodium?
A.NaB.SoC.NO ANSWERD.NO ANSWER
6.A flask is weighed and has a mass of 50.0 grams. Then, 2.0 grams of sodium metal is added to the flask. Chlorine gas is pumped into the flask. This allows the sodium metal to react completely with chlorine to produce sodium chloride. The flask and sodium chloride are weighed and have a mass of 55.0 grams. What is the mass of the sodium chloride produced?
A.5.0 gramsB.3.0 gramsC.50.0 gramsD.7.0 grams
7.A solution of hydrochloric acid is placed on a balance. Magnesium metal is added and the mass is recorded. The solution is stirred and the mass of the solution is recorded every 10 minutes. The following data is collected:
Time (mins)Mass of Hydrochloric Acid and Magnesium (g)0160.0 g10156.5 g20152.0 g30147.5 g40142.5 g What does the data show is occurring?
A.The hydrochloric acid and magnesium metal react to form a gas.B.The hydrochloric acid and magnesium metal react to form a soluble compound.C.The hydrochloric acid and magnesium metal react to form a precipitate.D.The hydrochloric acid and magnesium metal do not react.
8.Nitrogen gas has the chemical formula N2. One molecule of nitrogen gas is made up of
A.two atoms of nitrogen and one atom of oxygen.B.one atom of nitrogen and one atom of oxygen.C.one atom of nitrogen.D.two atoms of nitrogen.
9.Which of the following is an example of a compound?
A.OB.H2OC.ClD.Na
10.The chemical formula _______ represents a simple sugar.
A.C6H12O6B.CO2C.H2OD.NaCl
11.Which of the following equations is balanced correctly?
I.2 Ag2O → 4 Ag + O2
II.Cu + H2O → CuO + H2
III.Zn + HCl → ZnCl2 + H2
IV.2 C4H10 + 13 O2 → 8 CO2 + 10 H2O
A.I, II, III, and IVB.I, II, and IV onlyC.II and III onlyD.II, III, and IV only
12.The chemical formula CO2 represents carbon dioxide. One molecule of carbon dioxide is made up of
A.two carbon atoms and two oxygen atoms.B.two carbon atoms and one oxygen atom.C.one carbon atom and two oxygen atoms.D.one carbon atom and one oxygen atom.
13.A compound is made up of six carbon atoms, twelve hydrogen atoms, and six oxygen atoms. Which of the following chemical formulas represents this compound?
A.C6H12O6B.C12H12O12C.C12H6O6D.C6H6O6
14.Which of the following equations is balanced correctly?
A.2 C3H3 + O2 → 2 CO2 + H2O
B.3 H2O → H2 + 3 O2
C.Cl2 + 2 KBr → KCl + Br2
D.2 C2H2 + 5 O2 → 4 CO2 + 2 H2O
15.In the chemical formula CaCO3, what element does the symbol Ca stand for?
A.californiumB.carbonC.calciumD.cadmium
16.What does the small number 2 show in this chemical equation?
H2O 2H + O
A.There are 2 hydrogen atoms.B.There is half of a hydrogen atom.C.There are 2 water molecules.D.There are 2 oxygen atoms.
17.Chemical equations are used to model...
A.physical changes.B.rates of reactions.C.chemical reactions.D.molecular structures.
18.The chemical formula H2O represents which of the following substances?
A.saltB.waterC.hydrogen gasD.carbon dioxide
19.Look at the equation below.
O2 + CS2 → CO2 + SO2 Which of the following shows the equation balanced?
A.4 O2 + 4 CS2 → 4 CO2 + 4 SO2
B.3 O2 + CS2 → CO2 + 2 SO2
C.O2 + CS2 → CO2 + SO2
D.3 O2 + CS2 → 2 CO2 + SO2
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