What is a controlled experiment?

A. one variable is changed at a time

B. none of the variables are changed

C. all variables are kept constant

D. two variables are changed at a time

Which group of the periodic table had the elements with the lowest first ionization energies

How many milliliter is 6 tablespoons?

Convert the density 1.98 g/mL to the unit kg/m3. 1980 kg/m3 19.80 kg/m3 19800 kg/m3 0.198 kg/m3

Two jars are placed on a counter with a McDonald's French Fry inside, one has a lid, the other does not. They are left alone to see which one decays faster, after 2 days the fry in the closed jar looks fresher.

Sodium reacts with chlorine gas to form sodium chloride. 2Na + Cl2 → 2NaCl What mass of chlorine gas will react with 92.0 g of sodium? A. 298 g Cl2 B. 142 g Cl2 C. 63 g Cl2 D. 246 g Cl2

Which of the following elements is the most stable element? argon, manganese, phosphorus, robidium

List results of Chemical Reactions.

When you measure something in meters cubed, you are measuring

Low density: low pressure: high density Is which. evaporation? water vapor? condensation / liquid water

Which structures are found on sponges? pores medusae polyps stinging cells