Final Exam Chemistry

1. Each of four groups of students determined and recorded the melting point of a solid compound. If the actual melting point is 113C, which group had the best precision?

• Group 1

• Group 2

• Group 3

• Group 4

Which statement is NOT true about mass?

• It has the same value everywhere on Earth

• It is independent of gravitational forces

• It becomes less in outer space, farther from Earth

• It is a constant measure of the amount of matter

Tags

NGSS.MS-PS2-4

1. According to the periodic table of the elements, which elements belong to the same period

• Antimony and Arsenic

• Aluminum and Arsenic

• Germanium and Antimony

• Gallium and Germanium

Which element has 16 neutrons, 15 protons, and 15 electrons?

• Sulfur (S)

• Phosphorus (P)

• Gallium (Ga)

• Zinc (Zn)

Tags

NGSS.MS-PS1-1

A student multiplied 28.0 cm x 23.538cm x 25.68cm. How many significant figures should the answer have?

• 2

• 3

• 4

• 5

A student added the following numbers together 258.3kg + 257.11kg + 253 kg.

Which of the following answers contains the correct number of significant figures?

• 768

• 768.0

• 768.4

• 768.41

Determine the number of significant figures in the following mass

820,400.0 kg

• 4

• 6

• 7

• 3

When working with chemicals in the science laboratory which is something that you should NOT do?

• Read the label of chemical bottles before using their contents

• Pour any unused chemicals back into their original bottles

• Use lots of water to wash skin that has been splashed with chemicals

• Take only as much as you need of shared chemicals

Which of the following statements are physical properties of matter. Choose ALL that apply

• Aluminum has a silvery color

• Gold has a density of 19.3g/cm3

• Sodium ignites when dropped in water

• Water boils at 100C

• Silver tarnishes

Three students measured the length of a stamp whose accepted length is 2.71cm. Based on the table, which statement is true?

• Student 2 is both precise & accurate

• Student 1 is more accurate than Student 3

• Student 2 is less precise than Student 1

• Student 3 is both precise & accurate