Butane (C4H8) is an easily compressible gas used in cigarette lighters. It has a melting point of and a boiling point of -138.4 °C and a boiling point of -0.5 °C. Would you expect a butane lighter to work in winter when the temperature outdoors is 25 °F? Why or why not?
Glucose, a form of sugar, has the formula C6H12O6. Which elements are included in this compound, and how many atoms of each are present?
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Key Concepts
Chemical Formula
Elements in Compounds
Atomic Count
Which of these terms, (i) mixture, (ii) solid, (iii) liquid, (iv) gas, (v) chemical element, (vi) chemical compound, applies to the following substances at room temperature?
a. Gasoline
b. Iodine
c. Water
d. Air
e. Blood
f. Sodium bicarbonate
g. Gaseous ammonia
h. Silicon
Hydrogen peroxide, often used in solutions to cleanse cuts and scrapes, breaks down to yield water and oxygen: Hydrogen peroxide, H2O2(aq) → Hydrogen, H2(g) + Oxygen, O2(g)
b. Which of the substances are chemical compounds, and which are elements?
Write the formula for ibuprofen: 13 carbons, 18 hydrogens, and 2 oxygens. What are the common uses of ibuprofen?
What is the difference between a physical quantity and a number?
Give the full name of the following units:
a. cc
b. dm
c. mm
d. nL
e. mg
f. m3
