A substance changes state from solid to liquid. What has happened?

O Aphysical change

O A chemical change

O A chemical reaction

The creation of matter

A sample of tap water contains 75 ppm aqueous FeCl3. How many particles of tap water would there be for every 75 particles of FeCl3? Group of answer choices 1,000 100,000 1,000,000 1000 10,000

Why does every sample of given substance has the same properties?

Which statement best relates an emprical formula with a molecular formula

Which way does the reaction move when more acid (H+) is added? " H2O (1) H + (aq) + OH - (aq) " a) The reaction moves to the left. b) The reaction moves to the right. c) This reaction does not change concentrations.

On a cold winter day, the heat from inside leaks out of the house, primarily through the windows. A. True B. False

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.