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1.54 Label each of the following as either a homogeneous mixture or a heterogeneous mixture:
a. gasoline c. concrete
b. vegetable soup
d. hot coffee
1.58 Label each of the following as either a physical change or a chemical reaction:
a. A puddle of water evaporates.
b. Food is digested.
c. Wood is burned.
1.60 Label each of the following properties of sodium as either a physical property or a chemical property:
a. When exposed to air, sodium forms a white oxide.
b. The density of sodium metal at 25°C is 0.97 g/cm3.
1.62 Label each of the following as either a pure substance or a mixture:
a. sucrose (table sugar)
c. urine
b. orange juice
d. tears
1.78 Determine the temperature reading of the following thermometer to the correct number of significant figures.
Diagram Description automatically generated
Text Description automatically generated
1.106 If a drop of blood has a volume of 0.05 mL, how many drops of
blood is in the adult described in Question 1.105?
1.108 A newborn is 21 in in length and weighs 6 lb 9 oz. Describe the
baby in metric units.
1.122 The weather station posted that the low for the day would be −10.0°F. Convert −10.0°F to:
a. °C
b. K
1.124 Convert 300.0 K to:
a. °C
b. °F
1.128 Calculate the density of 50.0 g of an isopropyl alcohol–water mixture (commercial rubbing alcohol) that has a volume of 63.6 mL.
1.30 Why is observation a critical starting point for any scientific study?
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