An alpha particle has a mass number of 2.

a. True

b. False

How much heat is absorbed by a 26g iron skillet when its temperature rises from 5oC to 25oC?

Answer the following: a) What causes color in source water such as river? b) Briefly discuss the problem caused by color in water. c) Briefly discuss how we can remove color in water?

Why is hydrogen unique among the elements

The rate of a reaction can be observed by measuring the change in the amount of a reactant over time, as given in the graph below. How does the rate of a reaction change with time and how does the collision theory explain this change?

Use the term selectively permeable in a sentence

What allows electrons to flow between electrodes in an electrochemical cell? a - conducting wire b - salt bridge c - electrolyte solutions d - battery

How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen? 1 mol of oxygen has fewer molecules. 1 mol of oxygen has more molecules. Each sample has the same number of molecules.

What types of elements tend to combine to form molecular compounds?

Removing salt from water would decrease its what

How can a gardener remedy soil that is overly basic.