Use the heat equation to calculate the energy, in joules and calories for each of the following lost when 75.0 g of water cools from 86.4 °C to 2.1 °C

To heat 10.0g of silver from 112 Celsius to 275 Celsius

Lost when 18.0g of gold cools from 224 Celsius to 118 Celsius

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

Identify and describe the three ways that mutations affect organisms.