112 Identifying Types of Reactions: For each reaction shown, determine whether it is a synthesis, decomposition, combustion, single replacement, or double replacement (precipitation) reaction. Then balance the equation.

___Cu(aq) + ___S ___Cu2S(s)
___Li +___O2 ___Li2O
___C8H18 + ___O2___CO2+ ___H2O
Pb(NO3)2+ __KI ___PbI2 + ___KNO3
___Al + ___ZnCl2 ___Zn + ___AlCl3
___Zr + ___N2 ___ZrN4
___C4H10+ ___O2___CO2+ ___H2O
___NaCl + F2 → NaF + Cl2
___BaCl2 + ___KF ___KCl + __BaF2
___CdO ___Cd + ___O2
___CsCl ___Cs + ___Cl2

Which of the following represents an upside-down image?

Aforklift raises a 1,020 n crate 3.50 m up to a shelf. how much work is done by the forklift on the crate? the forklift does j of work on the crate.

Aheat engine running backward is called a refrigerator if its purpose is to extract heat from a cold reservoir. the same engine running backward is called a heat pump if its purpose is to exhaust warm air into the hot reservoir. heat pumps are widely used for home heating. you can think of a heat pump as a refrigerator that is cooling the already cold outdoors and, with its exhaust heat qh, warming the indoors. perhaps this seems a little silly, but consider the following. electricity can be directly used to heat a home by passing an electric current through a heating coil. this is a direct, 100% conversion of work to heat. that is, 19.0 \rm kw of electric power (generated by doing work at the rate 19.0 kj/s at the power plant) produces heat energy inside the home at a rate of 19.0 kj/s. suppose that the neighbor's home has a heat pump with a coefficient of performance of 4.00, a realistic value. note: with a refrigerator, "what you get" is heat removed. but with a heat pump, "what you get" is heat delivered. so the coefficient of performance of a heat pump is k=qh/win. an average price for electricity is about 40 mj per dollar. a furnace or heat pump will run typically 200 hours per month during the winter. what does one month's heating cost in the home with a 16.0 kw electric heater? what does one month's heating cost in the home of a neighbor who uses a heat pump to provide the same amount of heating?