Chapter2 chem review

All of the following are steps in the scientific method expect

• observing and recording data

• forming a hypothesis

• disregarding data inconsistent with the hypothesis

• developing a model based on experimental results

0.25g is equivalent to

• 250kg

• 250mg

• 0.025mg

• 0.025kg

Which of these statements about units of measurement is NOT true

• a unit compares what is being measured with a previously defined quantity

• a unit is usually preceded by a number

• measurements can be compared without knowing their units

• the choice of unit depends on the quantity being measured

The number of grams equal to 0.5kg is

• 0.0005

• 0.005

• 500

• 5000

These values were recorded as the mass of products when a chemical reaction was carried out three separate times: 8.83g; 8.84g; 8.82g. The mass products from that reaction is 8.60g. The values are

• accurate, but not precise

• precise, but not accurate

• both accurate and precise

• neither accurate nor precise

Which of these metric units is used to measure mass

• m

• mm

• g

• L

The number of significant figures in the measurement 0.000305kg is

• 2

• 3

• 6

• 7

The speed of light is 300 000km/s. In scientific notation, this speed is written to one significant figure as

• 3 x 10^5 km/s

• 3.0 x 10^5 km/s

• 3.0 x 10^6 km/s

If one inch equals 2.54 cm, how many centimeters equal one yard

• 0.0706 cm

• 14.2 cm

• 30.5 cm

• 91.4 cm

1.06 L of water is equivalent to

• 0.00106 mL

• 10.6 mL

• 106 mL

• 1060 mL