Which statement is true?

a

Atoms can be changed

b

All atom are not stable

c

Atoms can never be changed

d

Both A and B

How man moles of Al2O3 are formed in the reaction 4Al (s) + 3O2 (g) 2Al2O3 (s)

How many moles of MgCl2 are there in 307 g of the compound?

Which of the following elements is a Group 1 metal? A. He B. F C. Ca D. Cs

The temperature of a sample of liquid water changes from 50°C to 30°C. Which statement best explains the change that must happen at the molecular level? A. The molecules move more quickly and their average kinetic energy increases. B.

What would you use to measure mads

What does the dashes line represent? A. Medium B. Boundary C. Normal D. Incident Ray

Only a small amount of cerium oxide nanoparticles is needed because the nanoparticles ... 1) are elements 2) are very reactive 3) have a high surface area to volume ration

Describe the solubility of water compared to ethanol?

When the free-energy change (AG) of a reaction is negative, the reaction is said to be: Endergonic Non spontaneous Spontaneous Endothermic

The solubility of carbon dioxide gas in water can be increased by