You start with a 500 g sample of Co-57. about how much time has passed if you end up with a 250 g sample

Investigating iron thiocyanate requires several chemicals which must be used with caution. Using knowledge of these chemicals, select whether the following statements are true or false.

Covert 12.64 g NaOH to moles

Which is an example of a base? a (lemon juice b (baking soda c (an insolator d (water

Many insulating materials contain spaces filled with air because air is what type of material

What substances that are formed by the chemical combination of two or more elements in definite proportions

Kool-Aid is made up of sugar (C6H12O6), food coloring, and water. It is an example of a (n) element heterogeneous mixture homogeneous mixture compound

A laboratory experiment requires 250 millimeters of water for boiling. It also requires 100 millimeters of water for a cooling process.

Which set of procedures and observations indicates a chemical change? A) Ethanol is added to an empty beaker and the ethanol eventually disappears. B) A solid is gently heated in a crucible and the solid slowly turns to liquid.

If 100 grams citric acid react with 100 g baking soda how many grams of carbon dioxide?

What state of matter undergoes changes in volume most easily? a. solidb. liquidc. gasd. frozen