Lab 10 - The Student Game | Complete Solution | Rated A+

Lab 10 - The Student Game | Complete Solution |

Rated A+

Experiment 1: Identify the piece of glassware that measures volume to the greatest number of significant figures. - 50 mL graduated cylinder

Experiment 1: Identify the piece of glassware that measures volume with the greatest precision. - 50mL graduated cylinder

A student is measuring the mass of a liquid sample using an electronic balance that measures to the thousandth of a gram. The balance displays the value for the mass of the liquid: 22.200 g.

What is the correct way to record this mass in a lab notebook? - 22.200g

How many sig figs are in 22.200g? - 3

How many sig figs are in the mass of salt (43.510), aluminum (54.110), & baking soda (30.050)? - 3, 3, & 3

A student is measuring the mass of a solid sample using an electronic balance that measures to the thousandth of a gram. The balance displays the value for the mass of the solid: 0.300 g.

What is the correct way to record this mass in a lab notebook? - 0.30g

How many sig figs are in 0.30g? - 3

Suppose a laboratory has a top-loading balance, which measures mass to the thousandths place, and an analytical balan which measures mass to the tenthousandths place. Which balance should a student use to measure the mass of a solid sample more precisely? - The analytical balance will measure the mass of the solid sample more precisely.

End of Lab 1 - 

Calculate the density of 10.000g of Solid #4 is added to graduated cylinder with 20.0mL of water. It displaces 9.4 mL of water. - d = m/V = 10.000g/9.4mL = 1.1 g/mL

Why is it important to perform several test on an unknown solid? - Some solids have similar properties, so performing several tests allows you to distinguish among the different solids.

Experiment 1: Suppose a student used less than 10.0 g of Solid #4 when determining the melting point. How would this affect the melting point of Solid #4? - The melting point would be the same as the melting point measured in the lab.

Experiment 1: Suppose a student used less than 10.0 g of Solid #4 when determining the density. How would this affect the density of Solid #4? - The density of Solid #4 would be the same as the density measured in the lab.

Experiment 2: Given the values for the intensive properties for the liquid compounds, why is it necessary to dete more than one property to identify your unknown? - Some liquids have similar densities, so evaluating more than one property allows you to distinguish among th liquids.

Experiment 2: Suppose a student used more than 10.0 mL of volume of Liquid #7 when determining the boiling point. How would this affect the measured boiling point? - The boiling point would be the same as the boiling point measured in the lab.

Experiment 2: Suppose a student used less than 10.0 mL of Liquid #7 when determining the density. How would this affect the measured density? - The density of Liquid #7 would be the same as the density measured in the lab.

A student performs an experiment similar to Experiment 1 using hydrochloric acid (HCI) and potassium hydroxide (KOH). The mass of the hydrochloric acid solution is 449.715 g. After combining the HCl and KOH solutions, the final combined mass is 605.381 g.

Write the complete balanced chemical equation for the reaction. Include states of matter. - HCl(aq) + KOH(aq) —-> H2O(l) + KCl(aq)

A student performs an experiment similar to Experiment 1 using hydrochloric acid (HCI) and potassium hydroxide (KOH). The mass of the hydrochloric acid solution is 449.715 g. After combining the HCl and KOH solutions, the final combined mass is 605.381 g.

What is the mass of KOH? - HCl + KOH = 605.381

HCl = 449.715

449.715 + KOH = 605.381

605.381 - 449.715 = 155.666 KOH

Experiment 2: Suppose a student reacted calcium carbonate with a solution of 1.0 M hydrochloric