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.

True or false: "haploid" means a cell contains only half of the genetic material

1. Most of the earth's surface is covered with

Compared to the atoms of nonmetals in period 3, the atoms of metals in period 3 have 1. fewer valence electrons 2. more valence electrons 3. fewer electron shells 4. more electron shells

Which of the following is not an organic compound? C6H14 CO2 CH4 C12H22O11

What could J. J. Thomson conclude from his experiments? Atoms are mostly empty space. Most of the mass of the atom is concentrated in the center. Atoms must balance positive and negative particles. Atoms are indivisible.

According to the graph, which activity has used the largest amount of water over the past twenty years?

Tiffany leaves balloons filled with helium gas inside her car in on a sunny day when she returns to her car some some of the balloons are much larger and a few have popped explain what happened

If the pH indicator bromothymol blue was added to the nitric acid solution, it's colour would be?

Which statement describes a chemical reaction? Atoms in the products are rearranged to form new substances. Atoms in the reactants are rearranged to form new substances. Atoms in the products change into new atoms to form new substances.

The gases CO₂ (g) and NH₃ (g) can be liquefied at 20°C by compressing them to sufficiently high pressures. A student claims that NH₃ (g) can be liquefied at a lower pressure than CO₂ (g) can be liquefied.