During radioactive decay, atomic nuclei of unstable isotopes

a. give off nuclear radiation.

b. are broken down by radioactive bacteria.

c. form chemical bonds.

d. are unchanged.

In what type of change is matter conserved? select one: a. physical only b. chemical only c. physical and chemical

What physically breaks hydrogen bonds between water molecules as ice melts? what physically breaks hydrogen bonds between water molecules as ice melts?

A 50.0-mL aliquot was taken from a 500.0 mL sample of tonic water containing an unknown amount of quinine and diluted to a volume of 200.0 mL. At 347.5 nm, the fluorescence intensity of the diluted sample was measured as 127 on an arbitrary scale.

What elements start with the letter P (periodic table)

Explain why the conversion of water vapor to liquid water makes the air around it warmer.

How much ice at a temperature of - 17.5 ∘C must be dropped into the water so that the final temperature of the system will be 31.0 ∘C?

Why does a gas fill completely the vessel in which it is kept?

Individuals who work full time and those who work part-time enjoy basically the same number of paid leave benefits. True False

There is a large increase in ionization energy between the second and the third ionization energies of a metal. What kind of ion is the metal likely to form? Include the charge in your answer.

Which of the following are true statements about equilibrium systems? For the following reaction at equilibrium: CaCO3 (s) ⇌ CaO (s) + CO2 (g) adding more CaCO3 will shift the equilibrium to the right.