Matter that is composed of two or more different elements chemically combined in a fixed proportion is classified as

(1) a compound (3) a mixture

(2) an isotope (4) a solution

Pure water at 25°C ionizes in the presence of acid to form an equilibrium in which ionizes in the presence of acid to form an equilibrium in which self-ionizes to form an equilibrium in which self-ionizes to form an equilibrium system in which

What is the process by which starch is broken down?

Select all of the examples of an acid. Lemons, Vinegar, Soap, Tomatoes, Baking soda, Bananas, Bleach, Ammonia

How much heat is lost when 575 g of molten iron at 1825 K becomes solid at 1181 K and cools to 293 K?

What is the correct name of the compound Hg2CrO4? (a) Mercury (l) chromate (b) Mercury (ll) chromate (c) Mercury dichromate (d) Dimercury chromate (e) Monomercury chromate

Which is the best predictor of the radioactive nature of an isotope? (A) the proton-to-electron ratio (B) the neutron-to-proton ratio (C) the neutron-to-electron (D) ratio the electron-to-proton ratio

Which of the following statements correctly describes the relationship between fossils and rock strata? Fossils found in the rock strata are all the very small in size. Fossils are all found only in the top layers of the rock strata.

The trend for ionization energy is a general increase from left to right across a period. However, magnesium (Mg) is found to have a higher first ionization energy value than aluminum (Al).

A man is about to receive a bone marrow transplant. He is taking pills to suppress his immune system so that: A. his immune system does not attack the transplanted marrow. B. his immune system can recover after surgery. C.

Nickel (ii) chloride dissolves in water to form a light green solution. what ions are present in solution-that is, what is "swimming around" in the aqueous solution? write the formulas