Reference no: EM13855780
1. I have discovered a new compound which I have named MidasEne. It has the ability to magically turn everything that it touches into gold. I am trying to keep the formula proprietary, but you are smart, and you have figured out that my compound has a molar mass of 960.56 grams/mol and an empirical formula of C3H4O5. So what is the molecular formula of my secret compound?
A. CH1.33O1.67
B. C12H16O20
C. C3H4O5
D. C24H32O40
E. none of the above
2. I tried to impress my friend by telling her I bought a new ring that had 2 million (or 2.00 x 106) atoms of elemental gold in it! However, she has mad science skills and saw through the ruse. She quickly pointed out that this only equaled how many grams?
A.1.19 × 1032
B.6.54 x 10-16
C.8.43 × 10-21
D.1.97 x 108
3. In order to write an equation representing a chemical reaction, you must first know
A.the molar mass of all the reactants and products.
B.whether the reactants are acids or bases
C.the atomic mass of each atom involved.
D.the symbols and formulas of all reactants and products.
E.none of the above.
4. Which of the following household items is most likely NOT an acid?
A.lemon
B.orange
C.dishsoap
D.vinegar
E.none of these are acids
When you are balancing the reaction ___H2 + ___N2 → ___NH3 , what number goes in front of NH3?
A.1
B.2
C.4
D.3
E.5
5. Oxidation-reduction reactions are also known as redox reactions. We learned about their unique characteristics in this lesson. Which of the following would be a FALSE statement given what we learned about redox reactions?
A.if an atom loses 1 or more electrons, it is "reduced"
B.when a redox reaction occurs, either reduction happens or oxidation happens, but never both in the same reaction
C.Redox reactions never involve elemental oxygen
D.If an atom gains 1 or more electrons, it is "oxidized"
E.All of the above statement are false.
6. If carbon dioxide is streamed over silicon in the right conditions, you can produce solid carbon and silicon dioxide: CO2 + Si → SiO2 + C. Suppose if you stream 2.75 mole of CO2 over 1.50 mole of Si. Which of the choices below represent a true statement about this reaction?
A.The CO2 is the limiting reactant.
B.The SiO2 is the limiting reactant.
C.You have equal stoichiometric amounts of reactants.
D.The Si is the limiting reactant.
E.none of these are true
7. Suppose you were tasked with producing some nitrogen monoxide (a.k.a. nitric oxide). I'm sure this is often requested of you. You can do it by combusting ammonia (be careful!). The equation would be as follows: 4NH3 + 5O 2→ 4NO + 6H2O. If you form 8.7 mol of water, how much NO forms?
A.2.33 mol.
B.8.7 mol.
C.4.4 mol.
D.5.8 mol.
E.none of the above
8. Magnesium oxidizes pretty easily via the reaction 2 Mg + O2 → 2 MgO. The reaction has a ?H rxn = -1203 kJ. How much heat (in kJ) is released when you completely react 4.500 moles of O2?
A.-401.0 kJ
B.-1203 kJ
C.-2406 kJ
D.-5414 kJ
E. none of the above
9. If you are looking to make a ginormous explosion, just drop some elemental cesium into water: Cs + 2H2O → Cs(OH)2 + H2. If you are looking to make a big boom and want to produce 228.0 mol of hydrogen gas, how many moles of Cs would you need?
A.114.0
B.228.0
C.456.0
D.50.00
E. not enough information
10. Based on what we have learned in the course thus far, if given two reactants, you should be able to predict the products and write a balanced equation. So, give the complete and balanced chemical equation for each of following chemical reactions: (A) silver (I) fluoride and cobalt (II) sulfide; (B) chromium (IV) phosphate and copper (II) sulfate; (C) nickel (II) nitrate and lithium; (D) hydrobromic acid and aluminum hydroxide; (E) the racing fuel nitromethane (CH3NO2) and oxygen (HINT: In this reaction, the two typical combustion products form, but also nitrogen gas). You must show all work clearly and in detail to receive credit. All numbers immediately following elemental symbols should be understood as subscripts.
11. Alkali metals are extremely reactive with water. Suppose I give you a 57.20 g chunk of cesium and you throw it into a lake. When it reacts with water to form cesium hydroxide and hydrogen gas, how much hydrogen in grams is theoretically produced? Write a balanced equation for the reaction and show all work clearly and in detail to receive credit. All numbers seen immediately following the elemental symbols are intended to be subscripts.