Question 1

What does the figure represent?
​

Accepted Answer

A) A heterogeneous mixture of elements. 
B) A pure substance which is an element. 
C) A pure substance which is a compound. 
D) A homogenous mixture of elements and compounds. 
E) A heterogeneous mixture of elements and compounds. 
A) A heterogeneous mixture of elements. 
B) A pure substance which is an element. 
C) A pure substance which is a compound. 
D) A homogenous mixture of elements and compounds. 
E) A heterogeneous mixture of elements and compounds.

Question 2

Which scientist is incorrectly matched with his idea or theory?

Accepted Answer

A) I. 
B) II. 
C) III. 
D) IV. 
E) V. 
A) I. 
B) II. 
C) III. 
D) IV. 
E) V.

Question 3

Which of these is not part of the scientific method?

Accepted Answer

A) Observation 
B) Law 
C) Theory 
D) Conclusion 
E) Experiment 
A) Observation 
B) Law 
C) Theory 
D) Conclusion 
E) Experiment

Question 4

Which of these statements is incorrect according to Rutherford's model of the atom?

Accepted Answer

A) Neutrons are part of the nucleus. 
B) Most of the volume of an atom is empty space. 
C) A neutral atom contains an equal number of protons and electrons. 
D) An electron is located in close proximity to the nucleus of an atom. 
E) The majority of the mass of the atom is concentrated in the nucleus. 
A) Neutrons are part of the nucleus. 
B) Most of the volume of an atom is empty space. 
C) A neutral atom contains an equal number of protons and electrons. 
D) An electron is located in close proximity to the nucleus of an atom. 
E) The majority of the mass of the atom is concentrated in the nucleus.

Question 5

A chocolate chip cookie is an example of what type of matter?

Accepted Answer

A) Element 
B) Compound 
C) Homogeneous mixture 
D) Heterogeneous mixture 
E) A cookie is not matter. 
A) Element 
B) Compound 
C) Homogeneous mixture 
D) Heterogeneous mixture 
E) A cookie is not matter.

Question 6

Which of these statements best explains the law of constant composition?

Accepted Answer

A) All atoms of a given element have the same weight. 
B) Atoms of different elements combine in fixed whole number ratios. 
C) The weight of an object is neither created nor destroyed in a chemical reaction. 
D) All samples of a given compound have the same proportion of constituent elements. 
E) The sum of the masses of the reactants equals the sum of the masses of the products in a normal chemical reaction. 
A) All atoms of a given element have the same weight. 
B) Atoms of different elements combine in fixed whole number ratios. 
C) The weight of an object is neither created nor destroyed in a chemical reaction. 
D) All samples of a given compound have the same proportion of constituent elements. 
E) The sum of the masses of the reactants equals the sum of the masses of the products in a normal chemical reaction.

What does the figure represent?

Which scientist is incorrectly matched with his idea or theory?

Which of these is not part of the scientific method?

Which of these statements is incorrect according to Rutherford's model of the atom?

A chocolate chip cookie is an example of what type of matter?

Which of these statements best explains the law of constant composition?

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Exam 1: Molecular Reasons

What does the figure represent? ​

Which scientist is incorrectly matched with his idea or theory?

Which of these is not part of the scientific method?

Which of these statements is incorrect according to Rutherford's model of the atom?

A chocolate chip cookie is an example of what type of matter?

Which of these statements best explains the law of constant composition?

The Chemists Toolbox

Atoms and Elements

Molecules, Compounds, and Chemical Reactions

Chemical Bonding

Organic Chemistry

Light and Color

Nuclear Chemistry

Energy for Today

Energy for Tomorrow: Solar and Other Renewable Energy Sources

The Air Around Us

The Liquids and Solids Around Us: Especially Water

Acids and Bases: the Molecules Responsible for Sour and Bitter

Oxidation and Reduction

The Chemistry of Household Products

Biochemistry and Biotechnology

Drugs and Medicine: Healing, Helping, and Hurting

The Chemistry of Food

Nanotechnology

Filters

What does the figure represent?