A molecule is made up of two or more chemically bonded atoms. true or false

Why is it significant that the color emitted from the hydrogen emission spectrum is not white?

Which of the following may have more than one phase? a. a pure solid b. a pure liquid c. a homogeneous mixture d. a heterogeneous mixture

The best solution for the problem of pollution by man-made technologies A. cannot involve anyone who is not a technology expert or an expert on pollution. B. can come only from efforts by experts on pollution. C.

In a chemical reaction, a certain amount of hydrochloric acid reacts with 10 grams of sodium hydroxide to produce 19 grams of a solution containing sodium chloride and water. Which statement is correct? The mass of water formed is 29 grams.

What happens to the mass of substances during a chemical change?

The masses of reactants is always greater than the masses of the products in a chemical reaction, because the products are combined together. TRUE FALSE

Which is a characteristic of a solution1. its particles scatter light2. ita particles are evenly distributed 3. its particles settle out 4. it has large suspended particles

Why might the increase of noise in natural areas be a problem, according to scientists studying wildlife? Support your answer with at least two details from the text.

What changes nitrogen gas in the air to nitrogen compounds that fall to the ground

How much time does it take a person to walk 12 km north at a velocity of 6.5 km/h