A 2.0-kg block of aluminum is at a temperature of 50°C. How much thermal energy will it lose when its temperature is reduced by half? The specific heat of aluminum is 897 J/kg·K.

Who is better, messi or cristiano, i need this for a chemistry class. asap

Abullet found at a crime scene may be used as evidence in a trial if the percentage of metals match to the composition of metals in a bullet from the suspect's ammunition. a forensic scientist's analysis of the bullet shows that it contains 11.9 g of lead, 0.5 g of tin, and 0.8 b of antimony. what is the percentage of lead metal in the bullet? express your answers to the one's place.

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.