Is coffee a pure substance or a mixture?

Why do solutions change color when mixed with another solution?

Yasmin's teacher asks her to make a supersaturated saline solution. Her teacher tells her that the solubility of the salt is 360 g/L at room temperature (25 °C).

Which of the following popular sayings is an example of a true scientific theory? Eating lots of carrots will improve your eyesight. It is safe to eat dropped food if you adhere to the 5-second rule. Drinking warm milk makes you sleepy.

3. Some scientists create new materials not found in nature, such as special fabrics, metal and carbon alloys, and plastics. Choose a material that you think isn't found in nature. Then describe its useful properties.

Gold has a molar (atomic) mass of 197 g/mol. consider a 2.47 g sample of pure gold vapor. (a) calculate the number of moles of gold present

Plastic, rocks, and steel are all matter. They are made of tiny particles that can't be broken down into smaller pieces. These particles are called:

The palm tree with island is a population or biome or community

A gene is a section of dna within a chromosome that codes for a

An electron charge e mass m and a positron charge e mass m revolve around their common center of mass under the influence of their attractive coulomb force Find the speed v of each particle in terms of e m k and their separation L

Find the density of an object with a volume of 2.5 cm3 and a mass of 8.0 g.