Which of the following is an indication that a substance has undergone a chemical change?

In 1869 many chemists did not agree with mendeleev's periodic table. Three reasons why.

For his truck, Joel purchases gasoline to which oxygen has not been added. What might be the result? . A. The engine will produce more exhaust. B. The fuel will not combust during compression. C. The engine will be unable to compress the fuel. D.

The type of energy that depends on position is called

If element X has 49 protons, how many electrons does it have? Your Answer:

In chemistry and chemical reactions what is concentration

Water vapor will condense, turn into a liquid, first on the outside surface of which glass

How many moles of oxygen are needed to make 6.50 moles of magnesium oxide?

Which of the following happens during a chemical change? Check all of the boxes that apply. One atom or more changes into atoms of another element. New substances with different properties are formed. Solids, liquids, or gases may form.

What material was added to powdered rock during tuttle and bowen's experiments?

Which of the following statements is true? Selected Answer: D. At least two of the above statements (A-C) are true. Answers: A. Ions are formed by adding or removing protons or electrons. B. Scientists believe that solids are mostly open space. C.