You’re deprived of your typical lab equipment but need to detect hydrocarbons in evidence. Which of the following tools would you most likely be able to use to release traces of hydrocarbons?
A) A cigarette lighter
B) A refrigerator
C) A fruit-drying machine
D) A faucet
Which solution contains exactly 0.50 mole of H2SO4?
A) 2.0 L of a 0.50 M solution
B) 2.0 L of a 1.0 M solution
C) 1.0 L of a 1.0 M solution
D) 1.0 L of a 0.50 M solution
Which of the following is an example of a trade-off?
A. Selecting a bag that can be recycled over
one that cannot
B. Selecting a bag that produces less waste
over a bag that is more expensive
C. Selecting a bag that takes a lot longer to
break down in a landfill than the alternative
D. Selecting a bag that produces less waste
over a bag that is more convenient
Comparing Plant Cells to animal cells, which statement is most correct?
In a calorimetry lab, sodium oxide is combined with water. Compute the
heat released in the formation of 1.99 grams of sodium hydroxide. Na2O +
H2O -> 2NaOH + 215. 76 kJ
Pick the larger species from each of the following pairs.
a. When comparing the two species Pd and Pd2+ the larger of the two is
b. When comparing the two species Se^2- and Sr^2+ the larger of the two is
c. When comparing the two species Sr and Sr^2+ the larger of the two is
d. When comparing the two species N and N^3- the larger of the two is
1. Sr^2+
2. Se^2-
3. Pd^2+
4. Pd
5. Sr^2+
6. N^3-
7. N^3-
N
Sr
Give two uses of compound under each of the following, in medicine and in industry
Cr,0,2- + 6 11 + 14 H+ + 2 Cr3+ + 3 12 + 7 H2O
Which of the following statements about the reaction given above is NOT true?
The oxidation number of iodine changes from – 1 to 0
The oxidation number of oxygen remains the same
O The oxidation number of chromium changes from +6 to +3
O The oxidation number of hydrogen changes from +1 to 0
What is the molarity of a NaOH solution if 25.0 mi is required to completely neutralize
40.0 ml of a 1.5 M solution of H2SO4?
A body of mass 0.5kg is thrown vertically upwards
from the ground with an Initial velocity of 80.m/sCalculate” the potential energy at B 80.0cm above the ground