CHEMISTRY HIGH SCHOOL

How many grams of the molecule (C2H4O2) would be required to make 1 L of a 0.5 M solution of the molecule? (Carbon = 12, Oxygen = 16, Hydrogen = 1)(A) 16
(B) 100
(C) 15
(D) 25
(E) 30

Answers

Answer 1

Answer:

MC₂H₄O₂ = 2 * 12 g/mol + 4 * 1 g/mol + 2 * 16 g/mol = 60 g/mol

c = 0.5 mol/L

V = 1 L

n = c * V

n = 0.5 mol/L * 1 L = 0.5 mol

m = n * M

m = 0.5 mol * 60 g/mol = 30 g/mol

answer E

(-_-(-_-)-_-)

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6 CO2 + 6 H2O + Energy--> C6H12O6 + 6 O2 is the chemical formula for:A: abiogenesis
B: Respiration
C: Photosynthesis
D: Homostasis

Answers

This would be the formula representing the process of C. Photosynthesis.

Answer:

C. photosynthesis

Explanation:

Which of the following would be the best name for MgCl2? magnesium chlorine magnesium chloride magnesium dichloride monomagnesium dichloride

Answers

Answer: magnesium chloride

Explanation: Magnesium chloride is an ionic compound which is formed by combination of $Mg^(2+)$ and $Cl^-$ ions.

The name of the ionic compound is written as follows:

The name of the metal is written first followed by the name of the non metal without any prefix but the name of the non metal ends with ide, ite, ate or ite.

Thus the name of $MgCl_2$ is magnesium chloride.

It would be magnesium chloride.

Chlorine is a wrong name for Cl.

Dichloride doesn't work, even though Cl2 is 2 chloride, but according to some laws of nomenclature, saying dichloride isn't necessary so we don't say it.

And monomagnesium isn't right for the same reason as above.

How many milliliters of hydrogen gas are produced by the reaction 0.020 mol of magnesium with excess of hydrochloric acid at STP?

Answers

The reaction of magnesium and hydrochloric acid is a single displacement reaction. The reaction is expressed as Mg + 2HCl= MgCl2 + H2. There is a one is to one correspondence of Mg and H2. Hence there is also 0.02 mol of H2. Using PV=nRT where T is 273 K, P is 1 atm and R is 0.0821 L atm/mol K, volume is equal to 0.4483 L or 448.3 mL.

Answer: The answer is D

Explanation:

If the solution process is endothermic, then an increase in temperature usually results in:an increase in solubility

a decrease in solubility

no change in the solubility

a slower reaction

Answers

If the solution process is endothermic, then an increase in temperature usually results in an increase in solubility. Their heat of reaction is usually positive. The rest of the choices do not answer the question above.

Answer:

solubility increases

Explanation:

A student blows up a ballon and then places it in a very cold freezer the ballon shrunk after hours why!?

Answers

Temperature is directly related to the speed of the molecules such that as the temperature decreases, so does the speed of the molecules. When the balloon was placed in the freezer, the temperature plummeted and so the molecules moved less. Due to this lack of movement, less space was used by the balloon so it shrunk.

Which statement about exothermic reactions is accurate? a.As reactants form products, the potential energy decreases.
b.As reactants form products, the potential energy increases.
c.Thermal energy is transferred from the product to the reacting substances.
d.Thermal energy is transferred from the surroundings to the reacting substances.