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Worksheetsstem chemistry acount
Total questions: 20
Worksheet time: 41mins
What mass of O2 will be needed to burn 36.1 g of B2H6?
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
How many moles are 98.3 grams of aluminum hydroxide, Al(OH)3? (Ar Al=27, H=1, O=16)
1.26 moles
0.8 moles
7,673.4 moles
150 moles
2.46 g of sodium hydroxide (molar mass = 40) is dissolved in water and the solution is made to 100 cm3 in a volumetric flask. The molarity of the solution is:
3.14 M
0.04 M
0.615 M
4.2 M
The molality of a solution containing 20.7 g of potassium carbonate dissolved in 500 mL of solution:
(assume density of solution =1 g mL–1).
3.13 m
0.313 m
31.3 m
None of the above
How many grams of Na2CO3 should be dissolved to make 100 cm3 of 0.15 M Na2CO3 solution?
3.6 g
1.59 g
2.80g
4.32 g
250 mL of 1.5 M solution of sulphuric acid is diluted by adding 5L of water. The molarity of the diluted solution is:
0.0926
0.0823
0.0714
12
_______ are corrosive substances characterized as having a strong smell, a sour taste, and a _______.
Benjamin, Evelyn, and Kai are working on a science project. They found an unknown substance in a beaker in their school lab. They want to determine the relative pH of the unknown substance. Benjamin places a piece of blue litmus paper into the substance, and the litmus paper stays blue.
The substance in the beaker
is a base.
has a neutral pH.
is an acid.
there is not enough information here to give a definitive answer
If we dissolve 20.0 grams of HCl in 1.2 L of water, what is the pH of that solution?
0.34
4.21
7.20
10.34
The Kw at room temperature (25 degrees C) is equal to 1.0 x 10-14. It can also be defined as:
the pH and pOH of a solution
the product of the hydronium ion and the hydroxide ion concentrations
-log [hydronium ion]
antilog -pH
If a solution has a [OH-] of 2.3x10-4, it must be a(n)...
Acid
Base
Neutral
salt
