The period of an element is the amount of time is it takes for half of radioactive isotope to decay. true or false? If false, make a statement true

Correct the name to match the formula of the following compounds: (a) calcium (ll) dichloride. CaClZ; (b) copper (|l) oxide. Cu20; (c) stannous tetrafluoride. SnF4; (d) hydrogen chloride acid, HCL

What happens in a stationary front? A. A warm air mass collides with a stationary cold air mass, and slides under it B. A warm air mass catches up to a moving cold air mass, sliding over it C.

A substance having low specific heat capacity gets heated faster than another one with equal mass and having high specific heat capacity, why?

A box has a mass of 100 grams and a volume of 20 mL. Will the box sink or float in water? How do you know?

Note from the formulas of the reactants that one is an acid and one is a base. The precipitate formed is therefore a salt. What is the balanced formula for this salt? 1. OH 2. Ba2SO4 3. BaSO4 4. Ba (SO4) 2

What type of forces affects the speed and direction of motion of an object? A: Balanced forces B: Unbalanced forces C: Equal and opposite forces in the vertical plane D: Equal and opposite forces in the horizontal plane

Some ionic compounds do not dissolve in water because ... a) the ionic bonds are too strong to be broken by the attraction of the water molecules b) they float on the surface c) water is a covalent compound so it cant dissolve ionic compouds d)

Which element is humus especially rich in? oxygen carbon nitrogen or tungsten

Vitamins are classified according to A. their ability to fight disease. B. their coenzymes. C. their functions in the body. D. their solubility in water and fat.

What is the concentration of a solution of HCl in which a 10.0 mL sample of acid required 50.0 mL of 0.150 M NaOH for neutralization? What is the concentration of a solution of HCl in which a 10.0 mL sample of acid required 50.0 mL of 0.