Q Question 1 0 / 2 pts A catalyst is a substance that speeds up a chemical reaction and itself is also part of the chemical reaction. Question 2 2 / 2 pts Because oxygen is slightly soluble in water, it may be collected by a technique known as [blank]. Question 3 0 / 2 pts Oxygen is the most abundant element in the earth’s crust? Correct Answer Question 4 2 / 2 pts When a hydrocarbon burns in air, its elements combine with oxygen to form which two compounds?

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