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
