How many valence electrons does calcium have?

2

5

3

8

7

1

4

6

Alkanes and alkenes differ in that alkene molecules contain at least one: A. oxygen atom B. double bond C. triple bond D. chlorine atom

Give one example of a question that science would not be able to test. Then, explain how it could be changed into a testable question

You have reacted calcium nitrate with sodium chloride, sodium phosphate, and sodium oxalate. of the three reactions which ones would form a precipitate?

A scientist observes several metals and records the following data. Which of the data sets represents qualitative data? (select all that apply) The mass of the metals The volume of the metals The softness of the metals The color of the metals

1. What is the difference between mechanical advantage and efficiency?

If something is in high resolution you can see and object but not very clearly. True or False.

Which change might cause a cold spell in the northern united states

Kipps appratus is for what?

Which of the following statements about protons are true? Protons have twice the mass of neutrons. Protons have the same magnitude of charge as electrons but are opposite in sign. Protons have a charge of 1+.

What is true of an acidic solution at room temperature?