FREE CHEMISTRY AND STUDY GAMES ABOUT CHEMISTRY

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FREE CHEMISTRY AND STUDY GAMES ABOUT CHEMISTRY

VOCAB OW EXAM QUESTIONS

Qs and Ans Expert- Explanation

This Exam contains:

-Guarantee passing score -21 Questions and Answers -format set of multiple-choice -Expert- Explanation

Question 1: electron cloud

Answer:

the region of negative charge that surrounds the nucleus of an atom part of the atom that takes up the most space; electrons are found here

Question 2: mixture

Answer:

a composition of two or more substances that are not chemically combined with each other and can be physically sepa .

Question 3: compound

Answer:

a substance that contains two or more elements that are chemically combined and cannot be sepa by physical means

Question 4: neutrons

Answer:

parts of an atom that carry no charge; found in the nucleus

Question 5: Periodic Table of Elements

Answer:

a table of the elements, arranged in order of increasing atomic number. Elements having similar chemical properties and electronic structures appear in vertical columns.

Question 6: pH scale

Answer:

range of numbers that tell how acidic or basic a solution it. Range is from 1 - 14.

Question 7: atomic mass

Answer:

the mass of an atom (the sum of the protons and neutrons in the atom's nucleus)

Question 8: molecule

Answer:

the smallest particle of a substance that retains the chemical and physical properties of the substance and is composed of two or more atoms

Question 9: homogeneous mixture

Answer:

mixture in which particles of one substance are spread evenly throughout the other substance. Ex.Tea, root beer.

Question 10: nucleus

Answer:

central most important part of an atom; most of the mass of an atom is found here

Question 11: indicator

Answer:

something you use to test a solution to find out whether it is acidic or basic (litmus paper).

Question 12: protons

Answer:

parts of an atom that carries a positive electric charge; found in the nucleus

Question 13: atomic number

Answer:

the number of protons in an atom's nucleus

Question 14: acidity (acid)

Answer:

compounds that produce hydronium ions when dissolved in water. An acidic solution is one that has a 1-6 on the pH scale. Ex. Vinegar, oranges, stomach acid.

Question 15: alkalinity (base)

Answer:

compounds that produce hydroxide ions in water. A basic solution is one that has an 8-14 on the pH scale. Ex. Soap, ammonia, oven cleaner, antacids.

Question 16: electrons

Answer:

parts of an atom that carry a negative electric charge; found continually moving around the nucleus in the electron cloud

Question 17: heterogeneous mixture

Answer:

mixture made up of two or more different substances, which are mixed but are not combined chemically; Ex. Cereal, milkshakes, salad dressings with oil.

Question 18: atom

Answer:

smallest part of an element that cannot be broken down by any chemical means

Question 19: salts

Answer:

products that result when an acid and base neutralize each other. The process of neutralization always produces water and a salt.

Question 20: chemical bonds

Answer:

an attraction between atoms that allows the formation of chemical substances that contain two or more atoms. This bond is caused by the sharing of electrons.

Question 21: element

Answer:

is a substance formed when two or more elements are joined together chemically