General Chemistry 1

Which option best illustrates chemistry’s importance in everyday life?

• It helps us understand gravitational force.

• It explains the existence of day and night.

• It explains the difference between animal and plant cells.

• It gives us ideas on the composition of the materials we use.

When an environmentalist routinely measures various chemical concentrations in the atmosphere to monitor pollution, which aspect of chemistry’s role in daily life does this demonstrate?

• Industry depends on chemistry.

• The practice of many professions and occupations need good knowledge of chemistry.

• The application of theories in chemistry produces new and better materials.

• Everyday experiences at home and the community are all explained by chemistry.

Which branch of chemistry is involved in measuring the level of mercury in blood?

• analytical chemistry

• biochemistry

• organic chemistry

• physical chemistry

Which profession requires an understanding and application of concepts such as chemical reactions, kindling temperature, combustion, flammability, and the composition of materials?

• cook

• environmental health inspector

• firefighter

• radiologist

Which job primarily requires the application of air pressure?

• farmer

• radiologist

• pharmacist

• vulcanizer

Which chemistry concept is extensively applied in the field of pharmacy?

• combustion reactions

• preparation of compounds

• composition of water

• structure of water molecule

For the measurements 12.1 cm, 12.8 cm, 13.4 cm, and 13.2 cm, what is the mean length—and do these values exhibit precision?

• Mean is 12.875 cm – the data lacks precision.

• Mean is 12.875 cm – the data is precise.

• Mean is 13.175 cm – the data lacks precision.

• Mean is 13.175 cm – the data is precise.

Determine the number of significant figures in the volume 1.90 L.

• 1 significant figure

• 2 significant figures

• 3 significant figures

• 4 significant figures

Which concept explains why the number 65,000 can be interpreted as having either 2 or 5 significant figures?

• Captive zeros

• Final zeros

• Leading zeros

• Trailing zeros

Calculate the sum of 12.319 g, 1.2976 g, and 115.47 g, and express it with the proper significant figures.

• 129.0866 g

• 129.087 g

• 129.09 g

• 129.1 g