Which element is a noble gas?

(1) krypton (3) antimony

(2) chlorine (4) manganese

An antacid tablet dissolving in water is an (A) Endothermic reaction (B) Exothermic reaction

Which object is accelerating? ⦁ A car traveling at a constant velocity around an oval shaped track. ⦁ A bicycle slowing down as it goes up a steep hill. ⦁ A skate border speeding up as he skates down a ramp. ⦁ All of the above.

In the process of electrolysis, current can flow through a liquid because A. water molecules become negatively charged. B. hydrogen is electrically neutralized in the solution. C. negative ions are attracted to the anode. D.

A proton and electron are 0.40nm apart what is the attraction force

A phase change for carbon dioxide that occurs spontaneously at 20.°C and 1.0 atmosphere is represented by the balanced equation below. CO2 (s) + energy = = >CO2 (g) Write the name of this phase change.

Which type of substance can conduct electricity in the liquid phase but not in the solid phase? metallic element molecular compound nonmetallic element ionic compound

Differentiate between the significance of the coefficients in a balanced chemical equation

Why are nonnative species a threat to biodiversity? Why are nonnative species a threat to biodiversity? A. They often use up resources that other organisms need. B. They are not able to successfully breed in the wild. C.

What is the pressure inside a tank when it contains 87.3 moles of Helium if it holds 52.0 miles at 9.63 atm

Which statement describe how the bond between two oxygen bond atoms is formed?