Which of the following elements is not a metalloid?

A. boron

B. sulfur

C. silicon

D. arsenic

What kind of chemical change involves breaking down substances using electricity? a. Electrothermic c. Electrolysis b. Exothermic d. Electrodecomp

What type of intermolecular bond forms between the positive and negative ends of two adjoining polar molecules? A. Non-Polar Covalent B. Hydrogen C. Dispersion D. Dipole to Dipole

What is silicone used for

A rock contains 0.636 mg of 206Pb for every 1.000 mg of 238U present. Assuming that no lead was originally present, that all the 206Pb formed over the years has remained in the rock, and that the number of nuclides in intermediate stages of decay

Which type of radioactive decay only releases energy? A gamma rays B beta particles C helium nucleus D alpha particles

Why doesn't gravity pull water all the way to the center of the Earth?

What is centrifugation? Which substance is separated by this method?

All of the elements in a family or group have similar chemical properties. which of the following statements best explains why this is true? a. the elements in a group have the same number of protons in their nuclei. b.

A 124-mL bubble of hot gas initially at 212 °C and 1.80atm is emitted from an active volcano. What is the final temperature, in degrees Celcius, of the gas in the bubble outside the volcano when the final volume of the bubble is 138 mL and the

Describe the difference between a qualitative description and a quantitative description, and include an example of each.