Physical/Chemical
Is melting ice into liquid water a physical or chemical change?
Physical
How many sig figs are in 4,500m?
2 (trailing zeros with no decimal)
Is pure distilled water (H2O) classified as an element, compound, or mixture?
compound
How many centimeters are in 3.5 meters?
350 cm
Classify mass as either an extensive or intensive property.
extensive - depends on matter that is there.
Round 0.08451 to 2 sig figs
0.085
Which state of matter has a definite volume but takes the shape of its container?
Liquid
How many grams are in 0.45 kilograms?
450 g
List two signs that a chemical change/reaction has occurred.
color change, temperature change, gas production, formation of a precipitate, odor change, light emission
Calculate 14.21g - 2.1g and round answer to correct sign figs
Classify salt water as either a homogeneous mixture or a heterogeneous mixture.
Homogeneous Mixture (Solution)
Convert 45.0 minutes into days (don't forget sig figs)
0.0313 days (3.13 x 10-2 days)
Q: Explain why dissolving sugar in water is a physical change.
Dissolving sugar only changes its state/form without altering chemical identity
Calculate 3.12 g / 0.050 mL and round to correct sign figs
62 g/mL
Why is salt (NaCl) a compound?
Sodium is an explosive metal, chlorine is a poisonous gas - together, they chemically combine and have new properties
Convert 2.50 miles into CM.
402,000 cm (4.02 x 105 cm)
Q: Is the formation of a precipitate when two clear solutions mix an intensive property, extensive property, physical change, or chemical change? Explain.
A: Chemical change; new substances with different chemical properties are formed
Find the density of a 13 g rock that occupies 2.549 mL of space.
5.1 g/mL
Explain the key difference between a compound (CO2) and a homogeneous mixture (like air).
Compounds contain atoms chemically bonded in fixed proportions; mixtures contain physically combined substances in variable proportions
How many gigaseconds are in 8.5 x 1014 microseconds?
0.85 gigaseconds (8.5 x 10-1 gigaseconds)