CHM108 Lab Midterm Review

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Calculate the volume, in cubic centimeters, of a box which is 125 cm long, 37 cm wide, and 68 cm high. Report the answer with correct significant figures in cubic centimeters.

310000 cm3

Words to describe physical changes.

Odor, hardness, texture, solubility, etc.

Insoluable

When a solid does not dissolve when added to a liquid

Soluble

When a solid is added to and dissolves in a liquid

Remove clothing and continue flushing the area for

15 minutes

The temperature of a room is 22.5 °C. What is this temperature expressed in Kelvin (K)?

295.65 K

Calculate the volume (in cm3) of a rectangular solid with the given dimensions, rounding your answer to the proper number of significant figures. 0.982 cm x 4.71 cm x 8.3 cm=

38 cm3

What is the correct reading of the volume in the pictured buret?

39.95 mL

What is the correct reading for the graduated cylinder in the close-up?

40.5 mL

Perform the calculation, rounding your answer to the proper number of significant figures. 91.2753 g - 42.367 g=

48.908 g

Which device is best for measuring the mass of a liquid?

A balance

Identify the common indicators that a chemical reaction has occurred.

A change in temperature, change in color, precipitation being formed, bubbles being produced

What is an MSDS?

A list of hazardous ingredients of a product, the physical and chemical characteristics, its effect on human health, etc. (Material Safety Data Sheet)

Explain the greenhouse gas effect.

A natural atmospheric warming in which solar energy is absorbed by the earth's surface and is reradiated and absorbed by certain atmospheric gases (primarily carbon dioxide and water vapor); absorb thermal infrared radiation

When should lab participants look at the Safety Data Sheet (SDS) of a substance?

Before using the substance

A precipitate is formed from two solutions.

Chemical

A solution heats up upon mixing with another.

Chemical

Bubbles are produced upon mixing two solutions.

Chemical

The color of a substance changes over time.

Chemical

What do NFPA 704 symbols tell you?

Color-coded safety system where blue=health hazard, red=flammability hazard, yellow=reactivity hazard

Gamma rays and visible light are both

Electromagnetic radiation

Density is an extensive property because it only depends on the object's size.

False

The density of an object with an irregular shape is impossible to measure.

False

Words to describe chemical changes.

Flammability, rusting, precipitate, color change, etc.

What depicted situations are considered safety violations?

Improperly worn eye protection, food and drink in the lab space

How is density measured?

Mass/Volume

Choose the most appropriate task for each pictured piece of glassware.

Measuring out a volume of liquid

A liquid freezes into a solid.

Physical

A solid dissolves into water.

Physical

Stand under the shower and

Pull the lever

What should you do every time before you leave the lab?

Remove your lab coat, if you are wearing one, remove your gloves, and wash your hands

Discrete light sources

Show only bright or dark lines at very distinct and sharply-defined colors

Move to the safety shower if you spill hazardous chemicals on your

Skin or clothing

Identify the potential uses for an iron ring.

Supporting a beaker on a piece of wire mesh, suspending a funnel, holding a crucible placed in a clay triangle

What is the relationship between energy and wavelength?

The longer the wavelength- the less energy (and vice versa)

What result could indicate either a chemical or physical change?

The state of matter of the material is altered

Sublimation

The transition of a substance directly from a solid state to a gas state

An object with a density less than 1 g/mL will float on water.

True

As wavelength increases, the amount of energy decreases

True

Density is a physical property of an object.

True

Density is an intensive property because it only depends on the object's identity.

True

Immiscible

Two distinct layers will form when poured together

Continuous light sources

When light is composed of a wide, continuous range of colors

Miscible

When two liquids are mixed and become a uniform mixture

The color with the highest energy in the visible spectrum is

blue

The color with the lowest energy in the visible spectrum is

red


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