What is an alkali?

a) A substance that will neutralise an acid

b) A substance that produces H + ions when added to water

c) A soluble base

d) A chemical which changes colour when added to acids and alkalis

Do you think the chemical properties of the aluminum change as you cut the can?

What are the characteristics of a neutron? 1. It has no charge and no mass. 2. It has no charge and a mass of 1 amu. 3. It has a charge of + 1 and no mass. 4. It has a charge of + 1 and a mass of 1 amu.

How much solute can be dissolved in 100 ml of water at 41 degrees celsius

A compound is 54.53% C, 9.15% H, and 36.32% O by mass. What is its empirical formula?

A science teacher dissolved 50 grams of salt in 300 milliliters of water. he set the solution aside until all the water had evaporated. How many grams of salt should have been left in the glass container after the water had evaporated?

An atom of oxygen (atomic number 8) with an atomic mass of 16 would have how many neutrons?

Chlorophyll reflects which of these colors? a. red b. blue c. green d. yellow

Extracting oil from shale deposits a has been initiated on a large scale in the United States and will soon surpass Canada's production. b involves removing and refining waxy hydrocarbons called kerogen.

Which shows the levels of organization within an ecosystem from largest to smallest?

the physical properties of 10 grams of iron are the same as the ___ properties of 20 grams of iron a) reactive b) physical c) chemical