CHEM Lab Assessment

Front

What is a beaker used for in a chemistry lab?

Back

A beaker is a cylindrical container used for mixing, stirring, and heating liquids. It is not designed for precise measurements.

Front

How do you determine the number of significant figures in a number?

Back

Significant figures are determined by counting all non-zero digits, any zeros between significant digits, and trailing zeros in the decimal portion.

Front

What is the significance of the octet rule in chemistry?

Back

The octet rule states that atoms tend to gain, lose, or share electrons to achieve a full outer shell of eight electrons, leading to greater stability.

Front

What type of reaction is represented by the equation: FeS + HCl ⟶ H2S + FeCl2?

Back

This is a double replacement reaction, where two compounds exchange components to form two new compounds.

Front

What is the purpose of a graduated cylinder in a lab?

Back

A graduated cylinder is used to measure the volume of liquids accurately.

Front

How do you read the temperature on a thermometer?

Back

You read the temperature at the bottom of the meniscus of the liquid in the thermometer.

Front

What is the difference between a flask and a beaker?

Back

A flask has a narrow neck and is used for mixing and heating, while a beaker has a wide mouth and is used for holding and pouring liquids.

Front

What is the formula for calculating density?

Back

Density = Mass/Volume.

Front

What is a single replacement reaction?

Back

A single replacement reaction occurs when one element replaces another in a compound.

Front

What is the significance of the meniscus in liquid measurement?

Back

The meniscus is the curve at the surface of a liquid in a container, and it is important to read the measurement at the bottom of the meniscus for accuracy.