(a)
Interpretation:
A finely divided black substance is placed in a glass tube that is filled with air. The tube is heated with a Bunsen burner and the black substance is turned into red-orange. The total mass of the red-orange substance is greater than that of the black substance.
The black substance is an element or not has to be concluded and explained.
(b)
Interpretation:
A finely divided black substance is placed in a glass tube that is filled with air. The tube is heated with a Bunsen burner and the black substance is turned into red-orange. The total mass of the red-orange substance is greater than that of the black substance.
The red-orange substance is a compound or not has to be concluded and explained.
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Chapter 1 Solutions
OWLv2 for Moore/Stanitski's Chemistry: The Molecular Science, 5th Edition, [Instant Access], 1 term (6 months)
- Which of these statements are qualitative? Which are quantitative? Explain your choice in each case. (a) Sodium is a silvery-white metal. (b) Aluminum melts at 660 C. (c) Carbon makes up about 23% of the human body by mass. (d) Pure carbon occurs in different forms: graphite, diamond, and fullerenes.arrow_forwardA sample of solid elemental phosphorus that is deep red in color is burned. While the phosphorus is burning, a white smoke is produced that is actually a finely divided solid that is collected. a. Have the molecules of phosphorus been changed by the process of burning? Explain your answer. b. Is the collected white solid a different substance from the phosphorus? Explain you answer. c. In terms of the number of atoms contained, how do you think the size of the molecules of the white solid compares with the size of the molecules of phosphorus? Explain your answer. d. Classify molecules of the collected white solid using the term homotatomic or heteroatomic. Explain your reasoning.arrow_forward2.95 Engineers who design bicycle frames are familiar with the densities of aluminium (2.699 g/cm3), steel (7.87 g/cm3), and titanium (4.507 g/cm3). How does this information compare with Figure 2.12, and what would it suggest for changes in this figure if more shades were used for the density colour-coding? (Iron is the principal component of steel)arrow_forward
- Which of the these statements are qualitative? Which are quantitative? Explain your choice in each case. (a) The atomic mass of carbon is 12.011 (12.011 atomic mass units). (b) Pure aluminum is a silvery-white metal that is nonmagnetic, has a low density, and does not produce sparks when struck. (c) Sodium has a density of 0.968 g/mL. (d) In animals the sodium cation, Na+, is the main extracellular cation and is important for nerve function.arrow_forwardOn October 21, 1982, the Bureau of the Mint changed the composition of pennies (see Exercise 120). Instead of an alloy of 95% Cu and 5% Zn by mass, a core of 99.2% Zn and 0.8% Cu with a thin shell of copper was adopted. The overall composition of the new penny was 97.6% Zn and 2.4% Cu by mass. Does this account for the difference in mass among die pennies in Exercise 120? Assume the volume of the individual metals that make up each penny can be added together to give the overall volume of the penny, and assume each penny is the same size. (Density of Cu = 8.96 g/cm3; density of Zn = 7.14 g/cm3).arrow_forwardWhat is the chief factor that determines thephysical slateof a sample of matter?arrow_forward
- a Which of the following substances would you expect to be elements and which would you expect to be compounds? 1 aluminum sulfate; 2 osmium; 3 radon; 4 lithium carbonate; 5 dimethylhydrazine. b On what general rule do you base your answers to part a? Can you name any exceptions to this general rule for compounds?arrow_forwardWhich part of the description of a compound or element refers to its physical properties and which to its chemical properties? (a) The colorless liquid ethanol bums in air. (b) The shiny metal aluminum reacts readily with orange-red brominearrow_forwardWhich of the following are compounds, and which are elements? aNa2S bBr2 cPotassium hydroxide dFluorine eCompound or element fCompound or elementarrow_forward
- Consider two boxes with the following contents: the first box contains 10 blue paper clips and 10 red paper clips; the second contains the same number of each color of paper clip with the difference that each blue paper clip is interlocked with a red paper clip. Which box has contents that would be an analogy for a mixture, and which box has contents that would be an analogy for a compound?arrow_forwardIn the table below, there are descriptions of an experiment on samples of three different chemical elements. Decide whether the element is a metal or nonmetal, if you can. If there is not enough information to decide, choose can't decide in the third column. element description metal or nonmetal? ? Element 1 is a moderately soft silvery-gray solid. A 5 cm x 5 cm square of it, only 1 mm thick, is twisted using two pairs of pliers. The sheet breaks in the middle. The freshly broken edges are lighter colored than the surface. metal 1 nonmetal (can't decide) Element 2 is a shiny silvery-gray solid. A 10. g cube of it is set on a hot plate. After 10 minutes, the temperature of the top of the cube has risen by less than 1 °C. metal 2 nonmetal (can't decide) Element 3 is a hard silvery-gray solid. Wires are fastened to each side of a 2 cm slab of it, and an ordinary household 9 V battery is hooked up so that it can feed electricity through the slab to an LED. The LED glows brightly. metal…arrow_forward2.) Suppose you're attempting to measure the density of a liquid that is highly volatile (it evaporates quickly). If you first measure the volume and then several minutes later you measure the mass of the liquid will the measured density be higher than the true value, lower than the true value, or the true density of the liquid. [It helps to understand this problem with the density equation.]arrow_forward
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