exam final part 1

What is the mass in kilograms of a 25.00-pound dumbbell? (2.2 lb = 1 kg)

• 55.00 kg

• 1.377 kg

• 11.36 kg

• 1.377 × 10³ kg

• 1.135 × 10⁷ kg

An example of a homogeneous mixture (solution) is_____________.

•  

  oil mixed with water

  
  

• sugar mixed with water

•  

  salt mixed with oil

•  

  sugar mixed with sulfur

Which of these numbers has four significant figures?

• 0.3211

• 0.201

• 6.02 × 10²³

• 510

• 0.0103

Which of these is the correct scientific notation for 6,000,220?

• 6.022 × 10⁵

• 6.00022 × 10⁵

• 6.00022 × 10⁶

• 6.00022 × 10⁻⁵

• 6.00022 × 10⁻⁶

A horse is 4 ft 2 in tall.  What is the horse's height in cm?  (2.54 cm = 1 in; 12 inches = 1 ft)  (give 3 significant figures.)

• 128

• 19.7

• 127

• 1520

How many significant figures are there in the number 0.00350 m?

Determine the mass in grams of a gold sample that occupies a volume of 16.39 mL? Gold has a density of 19.3 g/mL.

• 316 g

• 1.18 g

• 0.849

• 0.316

• 0.118

How many significant figures are there in the number 17,730 in?

Which of these is the best definition of a scientific hypothesis?

• A prediction based on a limited number of observations

• A method of explaining observations that appears contradictory

• A broadly applicable generalization with virtually no exceptions

• A method for approaching problems that is used by all scientists

• A tentative model that describes the underlying cause of observations and laws

A(n) _____ is an explanation of a scientific observation.

• speculation

• theory

• conclusion

• prediction

• epiphany