Chemistry, 20.03.2020 21:26 putaprincess16
Vinegar (acetic acid) and baking soda (sodium bicarbonate) are mixed to form sodium acetate, water, and carbon dioxide. Which of the following materials MUST be available in order to prove the law or conservation of mass?
Answers: 2
Chemistry, 21.06.2019 22:00
Which of the following statements is true about planck’s law
Answers: 1
Chemistry, 22.06.2019 10:00
Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this
Answers: 3
Chemistry, 22.06.2019 11:40
Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)
Answers: 1
Chemistry, 22.06.2019 13:00
If two objects at different te,peraure are in contact with each other what happens to their temperature
Answers: 1
Vinegar (acetic acid) and baking soda (sodium bicarbonate) are mixed to form sodium acetate, water,...
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