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Unit Test
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The diagram shows a person using a piece of gym
equipment to lift weights.
Which best describes the body in terms of simple
machines?
The knees are inclined planes, and the lower legs hold the
loads. The ankles are the fulcrums.
The lower legs are inclined planes, and the knees hold the
loads. The ankles are the fulcrums.
The lower legs are levers, and the knees are fulcrums.
The ankles hold the loads.
The knees are levers, and the lower legs are fulcrums.
The ankles hold the loads
DT

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

Three alkali metals in group 1 are a. calcium, strontium, barium b. boron, aluminum, gallium c. sodium, potassium, rubidium d. fluorine, iodine, chlorine

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)