Exam 1-4 Flashcards
Which of the following explanations is a testable hypotheses?
A) a sugar crystal is forming faster because it is grown in a cold environment.
B) A plant is dying because of the direction of spinning of the earth.
C)a bird lays more eggs because of the intensity of thunderstorms
D) a burp increases the weight of a baby
Answer:A
All matter is composed of tiny, indivisible particles called atoms. All atoms are composed of protons, neutrons and electrons. The statements are an example of a\_\_\_\_. A) law B) theory C) hypotheses D) experiment
Answer:B
Scientific laws differ from scientific theories in that.
A) laws explain observations and theories describe observations.
B) laws describe observations and theories explain observations.
C) theories eventually become laws.
D) no difference exists. Laws and theories have the same meanings.
Answer:A
The conversion of a solid directly into a gas is called\_\_\_\_. A) vaporization B) deposition C) sublimation D)melting
Answer:C
Liquids have\_\_\_\_\_\_shape and\_\_\_\_\_\_volume A) fixed/variable B) fixed/fixed C) variable/fixed D)variable/variable
Answer:C
Which of the following is a chemical property? A)color B)flammability C)odor D)hardness
Answer:B
Which of the following is a chemical change? A)evaporation Of water B) melting copper C) tearing paper D)frying an egg
Answer:D
The number 390000,Expressed correctly in a scientific notation is\_\_\_\_. A) 3.9x10^-6 B)3.9x10^5 C) 3.9 D)3.9x10^-5
Answer:B
A patients temperature is taken three times by two different nurses. Nurse A-97,99,97. Nurse B-90,100,96
A) Nurse A’s results are more precise than those of Nurse B.
B)Nurse B’s results are more accurate than those of Nurse A.
C) both nurses have precise results
D) Nurse b’s results are both precise and accurate.
Answer:A
2.32 g is the same as\_\_\_\_. A)232 kg B)23.2 cg C)2320 mg D) 0.0232 dg
Answer:A
When 15.5 + 0.125 + 2.55 are added, assuming each of the numbers below is measured, the answer with the correct number of significant figures is\_\_\_. A)18.75 B)18.2 C)18.17 D)17
Answer:B
Subatomic particle with a positive charge is a(n)\_\_\_\_. A)electron B) neutron C) proton D) cation
Answer:electron
Which of the following below is not an element? A)sodium B)iron C)air D) Carbon
Answer:C
An atom of cobalt with a number of 60 has how many neurons? A) 27 B) 33 C)59 D)60
Answer:D
Mass number refers to
A) total number of protons and electrons
B)total number of protons
C) total number of neutrons and protons
D) total number of neutrons and electrons.
Answer:A
