final exam

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.

mass formula =Density×Volume

• 0.118 g

   

• 316 g

• 1.18 g

• 0.849 g

• 0 .316 g

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

• 1

• 2

• 3

• 4

Which of these numbers has four significant figures?

• 0.3211

• 0.201

• 6.02 x10 ²³

• 510

• 0.0103

An example of a homogeneous mixture (solution) is_____________.

•  

  oil mixed with water

  
  

• sugar mixed with water

• salt mixed oil

• sugar mixed with sulfur

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 cm

• 19.7 cm

• 127 cm

• 1520 cm

Convert 895 milliliters to liters.

• 895,000 L

• 0.895 L

• 0.0895 L

• 89.5 L

• 8.95X 10⁵ mm

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

• 1

• 2

• 3

• 4

• 5

How many pounds of calcium are there in 15 kg of calcium? (2.2 lb = 1 kg)

• 6.8 lb

• 15,000 lb

• 33lb

• 60. 60. lb

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