Can the density of an object change?

The half life of radium 226 is 1602 years. if you have 500 grams of radium today how many grams would have been present 9612 years ago?

How do I find the molar mass of Copper (II) Nitrate?

What happens when a given amount of gas at a constant temperature increases in volume? O A. The gas pressure decreases. OB. The gas pressure remains constant. OC. The number of gas molecules increases. O D. The number of gas molecules decreases.

How many significant figures does 546.000 have

Which type of substance ionizes partially and gives off hydrogen ions when dissolved in water? A. Strong acid B. Strong base C. Weak acid D. Weak base

In the formula for the compound xcl4 the x could represent

What is the main function of antibodies? A: "Remembering" the characteristics of germs that have invaded your body in the past B: Creating new white blood cells C: binding themselves to invading antigens D:Signaling your immune system that antigens

In the reaction 2H2O (l) + 2Cl - (aq) → H2 (g) + Cl2 (g) + 2OH - (aq), which substance is reduced? A. H2O B. Cl C. H D. OH E. None of the Above (This is not a redox reaction.)

Which statements about the periodic table's organization are true? Select all that apply. The periodic table is organized by atomic number. The periodic table is organized by reactivity. The periodic table is organized by atomic mass.

He definition "'oxygen' means an element having an atomic weight of 8 and an atomic number of 16" is an example of: