Student mixes 5 g of sand into a beaker of 20 g of water. Is this a physical or chemical change-why?

One of the main characteristics Of a solid is that they__.

A television set changes electrical energy to sound and light energy. In this process, some energy is

Which of the following changes are chemical changes? a. Water is frozen. b. Water is heated up. c. Gasoline is burned. d. Gasoline is evaporated. e. Water is boiled.

How many protons, neutrons, electrons, does isotope number 19 and mass of 39?

Which determines the frequency of a sound wave? A the intensity of the sound waves B the rate at which the sound source is vibrating C the pitch of the sound waves D the wavelength of the sound waves

On earth, the weight of an object changes. TrueFalse

When 5 grams of KCl are dissolved in 50. grams of water at 25°C, the resulting mixture can be described as (1) heterogeneous and unsaturated (2) heterogeneous and supersaturated (3) homogeneous and unsaturated (4) homogeneous and supersaturated

How have water & wind shaped Earth's Surface?

Convert 14 kilograms to pounds

Why are there only two elements in the first period of the periodic table? A. There are more than 2 elements in the first period of the periodic table. B. The first two elements share a unique property the rest of the periodic table does not have. C.