As part of an investigation, students combined substances in a beaker to observe chemical reactions. They performed two procedur
es. They measured the mass of each substance before and after each reaction. The table shows their observations.
Assuming the students did not make any careless errors, what likely explains these changes in mass?
A. Procedure 1: All the reactants were liquids that evaporated.
Procedure 2: A gas was formed as one product, and it escaped into the air.
B. Procedure 1: One of the reactants was converted to thermal energy.
Procedure 2: All the products were liquids.
C. Procedure 1: The reactants were liquids with different densities.
Procedure 2: The reactants were combined into only one product.
D. Procedure 1: One of the products was a gas that escaped into the air.
Procedure 2: A gas from the air reacted with one of the other reactants.
Assuming the students did not make any careless errors, what likely explains these changes in mass?
A. Procedure 1: All the reactants were liquids that evaporated.
Procedure 2: A gas was formed as one product, and it escaped into the air.
B. Procedure 1: One of the reactants was converted to thermal energy.
Procedure 2: All the products were liquids.
C. Procedure 1: The reactants were liquids with different densities.
Procedure 2: The reactants were combined into only one product.
D. Procedure 1: One of the products was a gas that escaped into the air.
Procedure 2: A gas from the air reacted with one of the other reactants.
2 answers:
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Answer:
0.258 mg of iron remains.
Explanation:
To solve this problem we can use the formula
M₂ = M₀ *
Where M₂ is the mass remaining, M₀ is the initial mass, and t is time in days.
Using the data given by the problem:
M₂ = 2.000 mg *
M₂ = 0.258 mg
11.43g/mL
Explanation:
Given parameters:
Volume of water in the graduated cylinder = 100mL
Volume of water + lead weight = 450mL
Mass of lead weight = 4000g
Unknown:
Density of the lead weight = ?
Solution:
Density is the mass per unit volume of a body.
Density =
Volume of the lead weight = volume of water displaced
Volume of lead weight = 450 - 100 = 350mL
Density = = 11.43g/mL
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