Matter Particles Notes Quiz

How many significant figures are present in the measurement 11.4 seconds?

• 3 sig figs (all are non-zeros)

• 1 sig fig (zeroes are placeholders)

• 3 sig figs (zero is between two non-zeroes)

• 4 sig figs (zeroes are after the decimal)

How many significant figures are present in the measurement 500 cm?

• 3 sig figs (all are non-zeros)

• 1 sig fig (zeroes are placeholders)

• 3 sig figs (zero is between two non-zeroes)

• 4 sig figs (zeroes are after the decimal)

How many significant figures are present in the measurement 101 miles?

• 3 sig figs (all are non-zeros)

• 1 sig fig (zeroes are placeholders)

• 3 sig figs (zero is between two non-zeroes)

• 4 sig figs (zeroes are after the decimal)

How many significant figures are present in the measurement 9.800g?

• 3 sig figs (all are non-zeros)

• 1 sig fig (zeroes are placeholders)

• 3 sig figs (zero is between two non-zeroes)

• 4 sig figs (zeroes are after the decimal)

What is the total mass of copper present? 10.1g + 4.5g + 7.24g = 21.84g Round 21.84g to 21.8g.

The density of an object is the relationship between its volume and mass. Mass measures the amount of matter in an object in grams. Volume measures the amount of space taken up by an object in liters. An old riddle goes, "Which is heavier, a pound of feathers, or a pound of lead"? They are both the same mass, but the lead is much more dense because it does not take up as much space.

Classify each of these as: Atoms or molecules, an element or compound, AND as a mixture or pure substance.

Timers at a swim meet used four different clocks to time an event. Which recorded time is the most precise?

• 55 s
• 55.25 s
• 55.2 s
• 55.254 s

Calculate the density of the cube.

• 2 g/cm³
• 4 g/cm³
• 6 g/cm³
• 8 g/cm³