Chemistry Homework 1

Which of the following combinations would form a solution? I) Water and ethanol II) Sand and table salt III) Oxygen and nitrogen IV) Oil and vinegar

E) I and III

Calcium is an example of a(n) A) element B) compound C) homogeneous mixture D) heterogeneous mixture

element

Which one of the following is an example of an element? A) concrete B) salt C) steel D) iron

iron

Some liquid in a jar can be separated by physical means into two separate liquids, which can then be separated no further. The liquid is a(n): A) Compound B) Element C) Mixture D) Pure substance

mixture

A theory is another word for a(n) _________. A) model B) law C) measurement D) experiment

model

Which one of the following is an example of an element? A) brass B) nickel C) bronze D) sterling silver

nickel

Which one of the following is an example of a heterogeneous mixture? A) coffee B) water C) sand D) tap water

sand

A homogeneous mixture is also called a ____________. A) solution B) pure substance C) heterogeneous mixture D) liquid

solution

Which of the following is NOT a type of scientific observation? A) Quantitative B) Qualitative C) Direct (sensory) D) Indirect (instrumental) E) Hypothetical

Hypothetical

Which of the following states of matter are considered fluids? I) Solid II) Liquid III) Gas

II and III

Which one of the following is an example of a homogeneous mixture? A) pure water B) carbonated soda C) apple juice D) pulpy orange juice

apple juice

Italian dressing contains olive oil and vinegar, which will separate out from each other if left to sit. This makes the dressing a: A) heterogeneous mixture B) Homogeneous mixture C) Both (A) and (B) D) None of the above

A) heterogeneous mixture

Gasoline is composed of a variety of different liquid hydrocarbons, which do not separate as time passes. Gasoline is an example of a: A) heterogeneous mixture B) Chemical compound C) Chemical element D) Solution

D) Solution

A human is an example of a(n) A) element B) compound C) homogeneous mixture D) heterogeneous mixture

D) heterogeneous mixture

Which hypothesis in this list is NOT testable by science? A) The earth is a flat disc. B) Carbon dioxide is a greenhouse gas. C) The boiling point of water increases with increasing elevation. D) The conductivity of saltwater increases with increasing concentration. E) No man is immortal.

No man is immortal

Which of the following is the first step in the scientific method? A) Hypothesis Formation B) Analysis of Results C) Background Research D) Observation E) Experimentation

Observation

How many independent variables should an experimenter manipulate in one experiment? A) 1 B) 2 C) 3 D) 4 E) It depends on the experiment.

1

Which of the following hypotheses is testable by using the scientific method? A) All men are mortal. B) The best color is blue. C) No life exists on other planets. D) All swans are white. E) Swimming is fun.

All swans are white

Which of the following facts about Einstein's Theory of Relativity does NOT define it as a scientific theory? A) It is falsifiable. B) It makes predictions that can be tested by experiment. C) It contradicted previous scientific theories. D) It is a scientifically acceptable general principle. E) It can be used as a model to explain natural phenomena.

It contradicted previous scientific theories.

What is the definition of a scientific law? A) It is witnessed and can be recorded. B) It gives an overall explanation of a natural phenomenon. C) It involves both a number and a unit. D) It summarizes an observable behavior.

It summarizes an observable behavior.

Grape juice is an example of a(n) A) element B) compound C) homogeneous mixture D) heterogeneous mixture

homogeneous mixture