A digital camera is priced at $369.89 at a department store. The same camera can be bought for$310.88 plus $12.50 shipping and handling over the Internet. How much would you save by bu ying the camera over the Internet?

Find the unit price. Round up to the next higher cent.

16-oz box of dog tre ats for $1. 79

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5 cans of tuna for $2.19

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3 rolls of film for $12.99

Find the unit price. Round up to the next higher cent.

3 large cans of dog food for $2.00

Find the unit price. Round up to the next higher cent.

4 batteries for $5.99

The total ____ of the products must ____ the total mass of the _____. This shows the law of ______________.

1. Analyze the Problem Known: ____________________ Unknown: _______________________
2. Solve for the Unknown Write an equation showing conservation of mass of reactants and products. mass of _____ = mass of _____ + mass of _____ Write an equation to solve for the mass of oxygen. mass of _____ = mass of _____ - mass of _____ Substitute known values and solve. Mass of oxygen = ___ g - ___ g Mass oxygen = ___ g
3. Evaluate the Answer Write an equation that shows mass of the two products equals the mass of the reactant. ___ g mercury + ___ g oxygen = ___ g mercury(II) oxide

Interpret the following balanced chemical equations in terms of particles, moles and mass. Show that the law of conservation of mass is observed. a. $\mathrm{N}_{2}(\mathrm{g})+3 \mathrm{H}_{2}(\mathrm{g}) \rightarrow 2 \mathrm{NH}_{3}(\mathrm{g})$ b. $\mathrm{HCl}(\mathrm{aq})+\mathrm{KOH}(\mathrm{aq}) \rightarrow \mathrm{KCl}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l})$ c.

Which do you think has more advantages: electricity generated by nuclear power or electricity generated by coal? Support your opinion with specific details.

Compare and contrast nuclear fusion and nuclear fission. How are they similar? How are they different?

Why is the disposal of nuclear waste a greater problem than the disposal of the trash that you and your family need to get rid of?

List the steps involved in using nuclear fission to generate electricity. Begin with the role of the fuel rods.

What is a nuclear chain reaction?

The cost of researching technology to extract alternative fossil fuels, such as oil sands and oil shale, is high. Do you think this is a wise investment? Explain.