How do scientists know that the universe is expanding?

What is the density of an object that has a mass of 119 grams and a volume of 30 ml?

A family ppoo holds 10000 gallons of water. how many cubic meters is this

How many grams of HCI would be required to make 250mL of 2M HCI

Name 5 metals used to make the penny over the years.

3. What is the volume of a salt crystal measuring 2.44 x 10-2 m by 1.4 x 10-3 m by 8.4 x 10-3 m? 2.9 x 10-5 m3 2.9 x 10-7 m3 2.9 x 10-5 m3 2.9 x 10-9 m3

In the chemical laboratory, why do scientists use a mortar and pestle? a. to increase surface area of a solute b. to decrease surface area of a solute c. to increase temperature of a solute d. to decrease temperature of a solute

Is a mixture being separated into two elements a chemical change

Which electrons are lost by an atom of iron when it forms the Fe3 + ion? A. One s orbital electron and two d orbital electrons B. Two s orbital electrons and one d orbital electron C. Three s orbital electrons D. Three d orbital electrons

What does a three letter chemical symbol mean

When 21.6 g of carbon were burned in the presence of 73.7 g of oxygen, 16.1 g of oxygen remained unreacted. What mass of carbon dioxide was produced?