A __ is two or more substances that are together in the same place but are not chemically combined

Rank from most to least number of valence electrons. To rank items as equivalent, overlap them. Arrange the elements in decreasing order of the number of valence electrons. kr ca ba br li f as sb o al cl si na ar sr

What needs more gas a heavealy loaded truck or an empty truck

What evidence indicates that a reaction has occurred? (Select all that apply.) a. The temperature decreased. b. A solid brown product formed. c. The temperature increased. d. A gas formed. e. An explosion occurred.

How many complex roots does the polynomial equation have? - 3 х4 - 7x+17=0

Ice does not need to melt into liquid water before it can return to the atmosphere as water vapor. a. True b. False

This element has 3 electrons in its Lewis dot structure and is in the 3p orbital section.

In an exothermic reaction, energy is transferred from a. the reactants to the surroundings. c. one reactant to another. b. the surroundings to the reactants. d. the container to the chemicals.

In any chemical compound the elements are always combined in the same proportion by__. a) charge b) mass c) volume d) density

Which would exhibit characteristics of both a metal and a nonmetal? select one: a. si b. ge c. sb d. po e. all of the above exhibit characteristics of both a metal and a nonmetal?

In the synthesis reaction, the white powder produced is magnesium oxide (mgo, mm = 40.3 g/mol). how many moles of magnesium oxide were formed (number of moles = mass (g) / molar mass (g/mol)) ? choose the closest answer. a. 0.21 moles b. 0.