Which vital element for life participates in the carbon, nitrogen, and phosphorus cycles?

O

A. oxygen

o

B. sodium

O

C. calcium

O

D. chlorine

In the formula X2 (SO4) 3, the X represents a metal. This metal could be located on the Periodic Table in (1) Group 1 (3) Group 13 (2) Group 2 (4) Group 14

Based on the data gathered in Millikan's oil-drop experiments, the concept of atomic structure was modified. Which of the following aspects of the structure of the atom was validated by these experiments?1. mass of the atom2. mass of an electron3.

If the total mass of the products of a reaction is less than the mass of the reactants, what must be true? A nuclear reaction has taken place. A chemical reaction has taken place. Nuclear fusion has occurred. Nuclear fission has occurred.

What are the smallest sub atomic structure

How do plants and animals get the food they need

0.100 mol of CaCO3 and 0.100 mol CaO are placed in an 10.0 L evacuated container and heated to 385 K. When equilibrium is reached the pressure of CO2 is 0.220 atm. 0.

What is true about the charges of transition metal ions?

A gas obeys the ideal-gas equation of state P V = N k T, where N = n NA is the number of molecules in the volume V at pressure P and temperature T and n is the number of gm-moles of the gas.

76. Which of the following choices is not an example of an adaptation? A. Nocturnal animal species have large eyes. B. One member of a wolf litter is born with shorter legs than its siblings. C.

Which is more dense a pound of rice or a pond of cement