How many joules of heat are needed to raise the temperature of 10.0 g of aluminum from 22°C to 55°C, if the specific heat of aluminum is 0.90 J/g° C?

How does litmus paper indicate an acid?

Write the empirical chemical formula of calcium with a mass percent of 38.8, phosphorus with a mass percent of 20.0, and oxygen with a mass percent of 41.3.

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?