Y
Yummy
Guest
1. A student failed to completely decomposed the ammonium bicarbonate in the mixture of ammonium bicarbonate, salt and sand. What effect will this have on the outcome of the experiment?
A) The mass of the sand will be elevated
B) The mass of the salt will be elevated
C) The % ammonium bicarbonate will be too great
D) There would be no effect
My answer is C
2. A student was given 2.645 g of a mixture that she then determined contained 0.665 g ammonium bicarbonate, 1.025 g sand and 1.195 g salt. Assuming her balance is weighing correctly, what did she most likely do incorrectly in her experiment?
A) Heated the evaporating dish too strongly
B) Failed to remove all the water from the salt /sand
C) Spilled some of the salt / sand
D) None of the above would cause the observed error
My answer is B
3. Phosphoric acid (H3PO4) is a colorless liquid used to make detergents, toothpastes, fertilizers and soft drinks. Calculate the mass (to 2 decimal places) of oxygen in 97.98 g of this compound.
4. Acetic acid (HC2H3O2) is a colorless liquid found in vinegar - vinegar is 5% acetic acid and 95% water. Calculate the mass (to 2 decimal places) of hydrogen in 60.06 g of acetic acid.
A) The mass of the sand will be elevated
B) The mass of the salt will be elevated
C) The % ammonium bicarbonate will be too great
D) There would be no effect
My answer is C
2. A student was given 2.645 g of a mixture that she then determined contained 0.665 g ammonium bicarbonate, 1.025 g sand and 1.195 g salt. Assuming her balance is weighing correctly, what did she most likely do incorrectly in her experiment?
A) Heated the evaporating dish too strongly
B) Failed to remove all the water from the salt /sand
C) Spilled some of the salt / sand
D) None of the above would cause the observed error
My answer is B
3. Phosphoric acid (H3PO4) is a colorless liquid used to make detergents, toothpastes, fertilizers and soft drinks. Calculate the mass (to 2 decimal places) of oxygen in 97.98 g of this compound.
4. Acetic acid (HC2H3O2) is a colorless liquid found in vinegar - vinegar is 5% acetic acid and 95% water. Calculate the mass (to 2 decimal places) of hydrogen in 60.06 g of acetic acid.