Praxis 2 (5435) Exam Practice Questions and Answers | 100% Pass
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Course
Praxis 5435
Institution
Praxis 5435
Praxis 2 (5435) Exam Practice
Questions and Answers | 100% Pass
Which of the following poses the greatest safety risk while being heated in a school
laboratory?
(A) A mixture of iron and sulfur
(B) Mercury(II) oxide
(C) Sodium chloride
(D) Copper(II) sulfate hydrate - Answer️️ -The best ...
Praxis 2 (5435) Exam Practice
Questions and Answers | 100% Pass
Which of the following poses the greatest safety risk while being heated in a school
laboratory?
(A) A mixture of iron and sulfur
(B) Mercury(II) oxide
(C) Sodium chloride
(D) Copper(II) sulfate hydrate - Answer✔️✔️-The best answer is (B). Mercury(II) oxide
breaks down on heating to metallic mercury and oxygen. Mercury vapor that is given off
is highly toxic when inhaled or absorbed through the skin, and exposure to mercury in a
school should be greatly limited if not eliminated altogether.
A piece of paper that appears blue in sunlight is illuminated solely by a red light that is
passed through a green filter. What color does the paper appear under this illumination?
(A) Blue (B) Green (C) Red (D) Black - Answer✔️✔️-The correct answer is (D). The green
filter absorbs all colors except green, which it passes. Therefore, the red light will be
absorbed by the filter, which will pass no light. The paper will not be illuminated, and so
it will appear black, regardless of its initial color.
What quantity of oxygen, O2, contains very nearly the same number of molecules as
36.0 grams of water, H2O?
(A) 64.0 grams
(B) 32.0 grams
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