Which substance can be broken down by chemical means?

(1) magnesium (3) mercury

(2) manganese (4) methanol

At STP, oxygen exists in two forms, O2 (g) and O3 (g). These two forms of oxygen have 1. different molecular structures and different properties 2. different molecular structures and the same properties 3.

When Na forms an ion it loses its outer electron to become Na+. Write the electron configuration for Na and Na+.

The element chlorine has two naturally occurring isotopes, 35Cl and 37Cl. Which is true about the atomic mass of chlorine provided on a periodic table? A. The atomic mass is calculated using the weighted average of the isotopes. B.

A solid white substance A is heated strongly in the absence of air. It decomposes to form a new white substance B and a gas C. The gas has exactly the same properties as the product obtained when carbon is burned in an excess of oxygen.

A campfire is an example of A. a fusion reaction. B. an exothermic reaction. C. a spontaneous reaction. D. an endothermic reaction.

Select the correct answer. A man pours some hot coffee into a small cup from a large jug that contains enough coffee for several cups. Which statement correctly compares the coffee in the cup and in the jug? A.

Is sponge cake a heterogeneous mixture

Describe three skills people use to conduct scientific investigations

The surface temperature on Venus may approach 739 K. What is this temperature in degrees Celsius?

Complete the acid-base reaction between butyric acid HC4H7O2 and potassium hydroxide KOH. Do not include phase designations for any of the reactants or products. Be sure to include the charge for any charged species.