FREE CHEMISTRY AND STUDY GAMES ABOUT CHEM CHAP

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FREE CHEMISTRY AND STUDY GAMES ABOUT CHEM CHAP

3 EXAM QUESTIONS

Qs and Ans Expert- Explanation

This Exam contains:

-Guarantee passing score -12 Questions and Answers -format set of multiple-choice -Expert- Explanation Question 1: The fact that a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound is known as

Answer:

the law of definite proportions Question 2: If two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers

Answer:

law of multiple proportions Question 3: the fact that chemical reactions involve merely the combination, separation, or rearrangement of atoms and that during these processes atoms are not subdivided, created, or destroyed by what law

Answer:

The Law of the conservation of mass

Question 4: What does atom mean in Greek

Answer:

indivisible

Question 5: An atom of carbon, C, and an atom of oxygen,

O, can combine chemically to form

Answer:

a molecule of carbon monoxide (CO) Question 6: The transformation of a substance or substances into one or more new substances is known as a

Answer:

Chemical reaction Question 7: the law of multiple proportions, in the case of the carbon oxides, the 2-to-1 ratio of oxygen masses results because

Answer:

Carbon dioxide always contains twice as many atoms of oxygen per atom of carbon as does carbon monoxide

Question 8: Dalton's Atomic Theory 3 - 5 says

Answer:

• Atoms cannot be subdivided, created, or destroyed.

• Atoms of different elements combine in simple whole-number ratios

to form chemical compounds.

• In chemical reactions, atoms are combined, sepa , or rearranged.

Question 9: The law that states that mass is neither created nor destroyed during ordinary chemical reactions or physical changes

Answer:

law of conservation of mass

Question 10: All matter is composed of

Answer:

atoms

Question 11: Dalton's Atomic Theory 1 -2 Says

Answer:

• All matter is composed of extremely small particles called atoms.

• Atoms of a given element are identical in size, mass, and other properties;atoms of different elements

differ in size, mass, and other properties.

Question 12: atoms of any one element differ in properties from

Answer:

atoms of another element which remains unchanged