Stoichiometry
What are the coefficients for the following equation if it was balanced?
_Fe + _Ov2 => _Fev2Ov3
4, 3, 2
A temperature of 298K is equal to what temperature on the Celsius scale?
25 degrees Celsius
The temperature of 1g water sample drops by 1 degree Celsius, resulting in the release of energy from the sample. In which phase will the greatest amount of energy be released? (Ice, Liquid Water, or Steam)
Steam (at 100 degrees Celsius)
What state of matter has a high density and an indefinite shape?
Liquids
Blood has a pH of 7.39, is it best classified as an acid or base?
Base
Which of the following will INCREASE the reaction rate?a) An increase in the concentration of the products
b)A decrease of the reaction temperature
c) Allowing more time for the reaction
d) An increase in the concentration of reactants
d) An increase in the concentration of reactants
Given 4.56 moles of Ov2, use the following balanced equation to determine the production of COv2 in moles.
CHv4 + 2Ov2 => COv2 + 2Hv2O
2.28 moles COv2
A gas mixture containing oxygen, nitrogen, and carbon dioxide has a pressure of 250 mmHg. If P(Ov2) = 50.64 mmHg and P(Nv2) = 0.230 atm, what is the pressure in mmHg of the COv2?
24.56 mmHg
How many joules are there in a 255 calorie snack?
1070 J
What is the Universal Solvent?
Water
When an acid reacts with a metal oxide, it produces ____ and _____.
Salt and Water
What are the three different kinds of radiation?
Alpha particles, Beta particles, and Gamma Rays
How much H3PO4 is produced with 8.50 moles P2O5 and 25.0 moles H2O, and what is the limiting reactant (for the following equation)
Pv2Ov5 + 3Hv2O => 2Hv3POv4
16.7 moles, Hv2O
If the volume of a sealed container is changed from 5.0 mL to 10.0 mL, while moles and pressure are constant, the temperature will _______.
Double
A slab of concrete gains 12,000 J of heat when it warms from 26 degrees Celsius to 30 degrees Celsius. Is it endothermic or exothermic, and how much heat did the air lose to the concrete?
endothermic, 12,000 J
Will ammonia (NHv3) and hexane (Cv6Hv14) dissolve in each other? Why or why not?
They will not dissolve in each other because one of the molecules is polar while the other molecule is nonpolar.
If the [OH-] ion concentration is 1 x 10^8 moles per liter, the solution would be best classified as what kind of solution? (basic, neutral, or acidic)
an acidic solution
A radioactive substance has a half-life of 3 seconds. How much time passes until 6.25% remains?
12 seconds
With the following equation, how many grams of Iron will make 175 grams of copper?
3CuSOv4 + 2Fe => Fev2(SOv4)v3 + 3 Cu
103 grams Fe
A sample of nitrogen gas at 25.0 degrees Celsius and .985 atm, and a volume of 2.00 L is contained in a tank. What is the volume of the nitrogen gas, if the temperature is changed to 50.0 degrees Celsius, and the pressure to 2.10 atm?
1.02 L nitrogen gas
If the enthalpy is negative, is the reaction exothermic or endothermic?
Exothermic
If you dilute 100mL of a 0.15 M NaOH solution until the final volume is 150mL, what is the new molarity?
0.10M
A 5.00mL sample of Hv3POv4 is titrated with 7.12mL of a 0.1090 M NaOH solution. What is the concentration of the Hv3POv4 solution?
(unbalanced equation)
Hv3POv4 + NaOH => Hv2O + Nav3POv4
0.0517 M Hv3POv4
The initial rate of a chemical reaction was measured, and one of the reactants was found to be reacting at a rate of 0.0011 mol/L s. The reaction was allowed to proceed for 15 minutes, and the rate was measured again. What would you predict about the second measured rate relative to the first?
The rate would be lower.