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A color change happens during an experiment mixing two liquids. Is this a physical change or chemical change? a. A color change always indicates a chemical change. b. Color is a physical property, so it is only a physical change. c.

How many valence electrons are available for bonding in bromine (Br) ?

A scientist observes several metals and records the followinv data. which of the data sets represents qualitative data? A The máss of the metals B The volume de the metal C the softness de the metal D the color of the metals

Ammonia chemically reacts with oxygen gas to produce nitric oxide and water. what mass of ammonia is consumed by the reaction of of oxygen gas? round your answer to significant digits.

Which layer of Earth has partially melted material that moves the tectonic plates? Crust, Inner core, Mantle, Outer core

C12 has 6 protons. how many neutrons does c13 have? a. 6 b. 7 c. 13 d. 19

Imagine you are at a local water park on a hot summer day and your feet begin to get hot from the cement. Looking ahead, you notice that there are two paths you can take to your favorite waterslide.

Determine the pH of a 0.350 M solution of HA. The pkb of A - is 12.830.

Which statement is true about oxygen-17 and oxygen-18?

A man is making chicken noodle soup and has found it to be too salty. What method could he use to make the soup less salty? a. Add equal measured amounts of water to the soup. b. Bring the soup to a boil so that some of the broth evaporates. c.