People have developed models of the universe for thousands of years. Identify two observations that a model of the universe would need to explain in order to be useful

Platinum is used to catalyze the hydrogenation of ethylene: H2 (g) + CH2CH2 (g) - ⟶Pt (s) CH3CH3 (g) H2 (g) + CH2CH2 (g) - ⟶Pt (s) CH3CH3 (g) Chlorofluorocarbons (CFCs) catalyze the conversion of ozone (O3O3) to oxygen gas (O2O2) : 2O3 (g) - ⟶CFC

If two clear liquids are mixed and a precipitate formed, what has probably happened?

What is the only way that elements can be separated

Which word equation represents a neutralization reaction? * base + acid salt + water base + salt → water + acid salt + acid base + water salt + water → acid + base

How will you justify that ice, water and steam are the three states of a substance and not different substances?

Carbon naturally occurs in two forms: diamond and graphite. Why do these two forms have very different properties?

How many moles of hydrogen are evolved when an excess of sodium metal is added to one mole of citric acid?

Write a net ionic equation for the reaction that occurs when barium sulfite (s) and excess hydrochloric acid (aq) are combined. Note: Sulfites follow the same solubility trends as sulfates.

A hydrate is a compound with water molecules incorporated into its crystal structure. In an experiment to find the percentage of water in the compound, the following data was recorded.

What do you get when you mix dog breeds such as a bulldog and a shih tzu?