As you are heating a beaker of an unknown substance, your instructor asks if the substance is giving off an odor. Which procedure should you follow to safely determine if the substance has an odor?

Science Quiz

Quiz
•
Science
•
8th Grade
•
Hard
Ning Chi
FREE Resource
72 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Pick up the beaker and let your lab partner smell it.
Put on your safety goggles and place your nose over the beaker.
Turn off the heat source and sit for 10 minutes.
Wave the fumes from the beaker toward your nose.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is NOT a part of Dalton’s atomic theory?
All elements are composed of atoms.
Atoms of the same element are alike.
Atoms are always in motion.
Atoms that combine do so in simple whole-number ratios.
3.
FILL IN THE BLANK QUESTION
30 sec • 1 pt
Thomson's model of the atom included negative __________ embedded in a ball of __________ charge.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why were so few alpha particles strongly deflected in Rutherford’s experiment?
The nucleus is not concentrated enough to deflect all alpha particles.
Alpha particles move too quickly to be deflected very often.
Alpha particles are attracted to the negative clouds of the atoms.
Atomic nuclei are very small, so few alpha particles impact them.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
JJ Thompson’s contribution to the development of atomic structure
was referred to as the “plum pudding model.”
was the discovery that electrons surround a dense nucleus.
proposed that electrons travel in circular orbits around the nucleus.
is the quantum mechanical model.
6.
FILL IN THE BLANK QUESTION
30 sec • 1 pt
Isotopes of the same element have different
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the total number of subatomic particles (protons, electrons, and neutrons) in an atom of vanadium-51?
51
74
102
125
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