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1. How do exponents (orders) in rate laws compare to coefficients in the balanced equations? *
A. They are ratio to one another.
B. They are directly proportional to each other.
C. The exponents and coefficients are the same.
D. The exponents do not have any relation to the coefficients.
2. Which statement about enthalpy is true? *
A. Specific heat capacity is the same for all liquids.
B. Some substances have a negative specific heat capacity.
C. The sign of ΔH is always negative in exothermic reactions.
D. Heat is given off to the surroundings in endothermic reactions.
3. When acetic acid is added to the aqueous solution of benzene, the ________________________ *
A. Freezing point is raised
B. Freezing point is lowered
C. Boiling point does not change
D. Freezing point does not change
1. A semipermeable membrane allows
A. Only solute particles through
B. Only solvent particles through
C. Neither solute nor solvent particles
D. Both solute and solvent particles through
2. When you place a straw into a glass of water, the water seems to climb up the straw before you even place your mouth on the straw. Which property of water is related to this phenomenon? *
A. Water has high specific heat.
B. Water has a high heat of vaporization.
C. Water is a liquid at normal physiological temperature.
D. Water molecules are adhesive; they form H-bonds with polar surfaces.
3. Which statement is true about catalysts? *
A. They speed up the reaction.
B. They are unrecovered at the end of the reaction.
C. The amount of catalysts decreases as the reaction continues.
D. They can slow down the reaction by consuming the reactants.
Calculate the number of chloride ions in 200 cm cube of 0.5 mol magnesium chloride solution
At a certain speed, the root-mean-square-speed of the molecules of hydrogen in a sample
of gas is 1055 ms-1
. Compute the root-mean square speed of molecules of oxygen at the
same temperature.
C6H12O6 +6O2 --> 6CO2 +H2O
If 54.1 grams of CO2 is produced in the reaction above, how many grams of H2O are produced in this reaction?
How many grams of oxygen are produced in the decomposition of 45.3g of potassium chlorate (KClO3)?
A chemist encounters an unknown metal. They drop the metal into a graduated cylinder containing water, and find the volume change is 5.3 mL. If the metal weighs 6.8 g, what is the density of the metal in g/mL?
In 100 mL of 6.02 M HCl, which has a gravity of 1.10 g/ml, a strip of magnesium metal with a mass of 1.22 g dissolves. The initial temperature of the hydrochloric acid is 23.0 °C, and the end temperature of the solution is 45.5 °C. Calculate AH for the reaction under the conditions of the experiment. (The heat capacity of the calorimeter is 562 J/°C, specific heat of the finals is 4.184 /gºC.) the reaction is: Mg(s) + HCl(aq) → MgCl2(aq) + H2(g)
If 4.0 moles of C3H8 will react with sufficient oxygen gas in the reaction,
C3H8 (g) + 5O2 (g) → 3CO2 + 4H2O(l),
how many moles of CO2 shall be formed?
what difference would the chemist observe at the negative electrode if aqueous zinc chloride was used rather than molten zinc chloride? answer
