How does matter change from one state to another?

Is an elements reactivity determined by the number of protons found in an atom of the element

An organism with no natural enemies is called

The atomic symbol 206 82 Pb represents lead-206 (Pb-206), an isotope that has 82 protons and 124 neutrons. Which atomic symbol could represent an isotope that undergoes radioactive decay to produce Pb-206? A. 238 92 U B. 222 87 Pb C. 178 72 Hf D.

Select the correct answer. In a given chemical reaction, the energy of the products is less tha the energy of the reactants. Which statement is true for this chemical reaction? A Energy is absorbed in the reaction. B.

D. 100 mph 1. You travel 200 km in 2 hours, what is your speed? a. 10 km per hrb. 400 km/hr c. 100 km/hr

A group of students wants to see how temperature affects the time it takes for spilled water to dry up in the investigation what will be the dependent and independent variables

What is not true of white light?

Diatoms and some yeasts are unicellular eukaryotes that have mechanisms of nuclear division?

Consider the circuit 9.012 9.012 What is its equivalent resistance? Answer in units of 12.

out of 2.00 50 mL of water is added to 30 mL of a 0.50 M salt solution. What is the new concentration? (To write your answer using scientific notation use 1.0E-1 instead of 1.0 x 10-1)