Why is water needed to provide spacecraft with oxygen

Complete the sentence. The lower the hydrogen ion concentration, the __ the pH. A) higher B) lower C) closer to 7 D) closer to 0

2. 2AgNO3 + CaCl2 → 2AgCl + Ca (NO3) 2 How much AgCl could be obtained starting with 100g of each reactant.

Why do you think elements must be heated before they emit colored light?

Why is it called a compound microscop

If there are 14 chromosomes in pea plant cells, how many chromosomes are present in a sex cell of a pea plant?

When in a compound, the oxidation number of a nonmetal: A). is always fixed and can never be changed B). can only be deduced once all the other oxidation numbers in the equation are totaled C).

Which of the following actions will not increase the rate at which a solid dissolves in a liquid? A. increasing the surface area of a solid B. stirring the solid and the liquid C. increasing the amount of the solid D.

Does the amount of heat absorbed as 1 kg of saturated liquid water boils at 100°C have to be equal to the amount of heat released as 1 kg of saturated water vapor condenses at 100°C?

F. Protection of the body from infectious organisms is accomplished by which of these tissues? a) bone; b) muscle; c) nerve; d) blood

A compound that is composed of molybdenum (Mo) and oxygen (O) was produced in a lab by heating molybdenum over a Bunsen burner. The following data was collected: Mass of crucible: 38.26 g Mass of crucible and molybdenum: 39.