When iodine solution is mixed with an unknown sample of food, the mixture turns a blue black color. this color change indicates the presence of?

Calcium reacts with hydrochloric acid, HCI, to make calcium chloride and hydrogen gas (H2). 1) write a word equation for this reaction. 2) write a balanced symbol equation for this reaction.

How many grams of oxygen is required to react with 9.30 moles of aluminium?

Angie mixes the fertilizer for her plants at the beginning of the week. She puts 40 g of the fertilizer-water solution in each of seven closed containers and uses one container each day to water her plant.

Which one of the following statements about absolute zero is correct? (a) At absolute zero, the volume of an ideal gas is zero. (b) At absolute zero, ideal gases freeze to give solids. (c) At absolute zero, solid and liquid water are at equilibrium.

To calculate the molarity of a solution you need to know the moles of solute and the

How many elements are in a set whole numbers between 3 and 15

Calculate the percent activity of the radioactive isotope strontium-89 remaining after 5 half-lives.

Describe 2 theories for yawning

When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. the reason for this is?

Where does transcription happen? why is it only in this location?