Chapter 1: Problem 31
Refer to the list of elements that appears on the inside front cover. What are the symbols for the elements lead, molybdenum, tungsten, chromium, and mercury?
Chapter 1: Problem 31
Refer to the list of elements that appears on the inside front cover. What are the symbols for the elements lead, molybdenum, tungsten, chromium, and mercury?
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Get started for freeWhich of the following are elemental substances and which are compounds: baking soda, \(\mathrm{NaHCO}_{3}\); graphite, \(\mathrm{C} ;\) dry ice, solid \(\mathrm{CO}_{2}\); metallic sodium, Na; metallic mercury, Hg?
The development of rust spots on an automobile body is an example of a _____ change. (physical or chemical)
Which of the following represent a chemical transformation? (a) \(4 \mathrm{P}(s)+5 \mathrm{O}_{2}(g) \rightarrow 2 \mathrm{P}_{2} \mathrm{O}_{5}(s)\) (b) \(\mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \rightarrow \mathrm{H}_{2} \mathrm{O}(l)\) (c) \(3 \mathrm{O}_{2} \rightarrow 2 \mathrm{O}_{3}\) Answer: (a) and (c) because the products are different from the reactants; (b) is a physical change because we have water on both sides of the arrow.
Mixtures can always be separated by physical means. Describe how you would separate the components in a mixture of sand and iron filings.
Examination of "homogenized" milk under a microscope reveals suspended globules of fat. Is milk a heterogeneous mixture or a homogeneous mixture? Explain.
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