How do humans spread organisms around the world?

7 An atom that has 13 protons and 15 neutrons is an isotope of the element (1) nickel (3) aluminum (2) silicon (4) phosphorus

When the argon and fluorine reach the same temperature they are both liquid. For the physical system of argon and fluorine what energy systems change from when you add the fluorine to when the temperatures equilibrate?

Which landforms might you see at a divergent plate boundary? Check all that apply. mid-ocean ridge mountain range rift valley volcano island

2Fe2O3 + 3C 4Fe + 3C02 You add 28 grams of carbon. You find the actual yield to be 81.2 grams of CO2. What is the percent yield of CO2 if the theoretical yield is 102.6g? 126.35% 0.79% 1.26% 79.14%

Which type of reaction releases the greatest amount of energy per mole of reactant? (1) combustion (2) decomposition (3) nuclear fusion (4) oxidation-reduction

12) _Na + _H2O → ___ NaOH + __H2

Match the mineral categories to their best descriptions. a. sulfide mineralsminerals that have a sulfur atom surrounded by four oxygen atomsb. sulfate mineralstable salt is an example of this type of mineralc.

A covalent bond is best described as Question 1 options: the sharing of electrons between atoms. the transfer of electrons. a bond between a metal and a nonmetal. a bond between a metal and a polyatomic ion.

If you have 100 grams of H2, how many moles of H2 is that?

Consider four elements from Group 7A: fluorine in the second period, chlorine in the third period, bromine in the fourth period, and iodine in the fifth period. Which element has the largest first ionization energy?