Chemistry Techniques

The diagrams show four pieces of laboratory equipment.

• A

• B

• C

• D

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

During an experiment a measurement is recorded in cm³ . Which apparatus is used?

• balance

• measuring cylinder

• stopclock

• thermometer

25 cm³ of an alkali are added to 20 cm³ of an acid. The temperature change is measured. Which apparatus is not needed in the experiment?

• 25 cm³ measuring cylinder

• 100 cm³ beaker

• balance

• thermometer

Tags

NGSS.HS-PS1-5

NGSS.HS-PS3-4

A student put 25.0 cm³ of dilute hydrochloric acid into a conical flask. The student added 2.5 g of solid sodium carbonate and measured the change in temperature of the mixture. Which apparatus does the student need to use to obtain the most accurate results?

• balance, measuring cylinder, thermometer

• balance, pipette, stopwatch

• balance, pipette, thermometer

• burette, pipette, thermometer

Tags

NGSS.HS-PS1-5

NGSS.HS-PS3-4

A student mixes 25cm³ samples of dilute hydrochloric acid with different volumes of aqueous sodium hydroxide. In each case, the student measures the change in temperature to test if the reaction is exothermic. Which piece of apparatus is not needed?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

NGSS.HS-PS3-4

A solid X is purified in five steps. The first four steps of the purification are shown in the diagram.

In step 5, how is a pure sample of solid X obtained from mixture Y?

• dissolving

• distillation

• evaporating

• filtering

Solid R reacted with dilute sulfuric acid. The initial temperature of the dilute sulfuric acid and the final temperature of the solution are shown.

What was the change in temperature in °C?

• – 6

• – 4

• 6

• 4

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

NGSS.HS-PS3-4

Which piece of apparatus is used to measure exactly 26.3 cm³ of a liquid?

• A

• B

• C

• D