A sample of quartz, which has a specific heat capacity of 0.730 Jg1, is put into a calorimeter (see sketch at right) that contains 300.0 g of water. The quartz sample starts off a insulated 95.8 °C and the temperature of the water starts off at 15.0 °C, when the temperature of the water stops changing it's 17.7 °C. The pressure remains constant at 1 atm.

Calculate the mass of the quartz sample.

The four giant gas points that are made primarily of lightweight elements are

The discovery that the universe appears to be expanding led to a widely accepted theory called a.) the big bang theory b.) the doppler effect c.) hubble’s law d.) solar nebular theory e.) the seyfert theory

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?