Which of the following measurements is expressed to three significant figures? 7.30 * 10-7 km 0.007 m 7077 mg 0.070 mm

A ball-and-stick model of a molecule provides much the same information as a

The combustion of 14 grams of CO according to the reaction CO (g) + ½O2 (g) CO2 (g) + 67.6 kcal gives off how much heat? Remember to use significant digit rules. 6,716 kcal 1,514 kcal 34 kcal 135 kcal none of the above

Volcanoes are openings in Earths crust where lava, gas, and ash can erupt. Where are active volcanoes located?

Which of the following statements is true of nuclear fusion? It involves the splitting of an atom's nucleus. It is the process currently used in most nuclear power plants. It is a very endothermic process.

Give 3 examples of physical changes

How many moles are in. 12 grams of gold.

When lithium reacts with bromine to form the compound LiBr, each lithium atom: (1) gains one electron and becomes a negativelycharged ion (2) gains three electrons and becomes a negativelycharged ion (3) loses one electron and becomes a

Based on what you know about matter, explain why the food coloring mixes at different rates

What does the variable A stand for in the Arrhenius equation? A. activation energy B. frequency factor C. rate constant D. reactant concentration

Name 3 sets of elements that have been added to the periodic table since mendeleev's time