How many valence electrons does a neutral lanthanide atom have?

Which is the best explanation for what keeps a balloon inflated Select one: a. gas particles colliding with the inside of the balloon b. gas particles being attracted to each other c. gas particles colliding with each other d.

On an X-Y graph of volume (X-axis) and mass (Y-axis), the slope of the line represents which of the following properties? A. time B. weight C. density D. distance

Which is an example of a catalyst? heat stirring decrease in temperature

A 1.00 liter solution contains 0.37 M nitrous acid and 0.48 M potassium nitrite. If 0.120 moles of calcium hydroxide are added to this system, indicate whether the following statements are true or false.

Calcium fluoride is 48.7% fluorine by mass. How many grams of calcium fluoride would contain 6.34 grams of fluorine?

How many moles of NO3 are there in 6.2g

Which compound will conduct electricity when it is dissolved in water? a. CH4 b. CuSO4 c. C6H6 d. C6H12O6

Peter is 5 ft, 11 inches tall. Paul is 176 cm tall. Who is taller?

Which is the MOST accurate description about how the different types of feedback mechanisms work

What was one of the main benefits to the use of the icebox for cooling food?