Chemistry, 11.11.2020 16:30 meganwintergirl

Help this is a test 16. The speed of sound usually travels in solids because .
A. faster; the molecules are closer together
B. slower; the molecules are closer together
C. faster; the molecules are farther apart
D. slower; the molecules are farther apart

17. In a longitudinal wave, where are the particles most spread out?
A. compression
B. crest
C. rarefaction
D. trough

18. Which is transferred by a radio wave?
A. air
B. energy
C. matter
D. space

19. Which of the following correctly describes refraction:
A. Light is transferred to energy.
B. Light bounces off an object or surface.
C. Waves bend around a barrier or object.
D. Waves bend as they move from one medium to another.

20. Which type of electromagnetic waves are used in tv remotes?
A. radio waves
B. micro waves
C. ultraviolet rays
D. infrared rays

21. In which medium is the speed of a sound wave the greatest?
A. air in your classroom
B. iron railroad track
C. pool of water
D. vacuum in space

22. In the image below, which part does the arrow point to?

A. wavelength
B. crest
C. trough
D. amplitude

23. Which wave can travel in both empty space and matter?
A. radio waves
B. sound waves
C. seismic waves
D. ocean waves

24. Which is an example of diffraction?
A. a flashlight beam hitting a mirror
B. a sunbeam striking a window
C. a water wave going around a large rock
D. a rainbow forming after a rain

25. Would changing the amplitude of a transverse wave change its wavelength? Why or why not?
A. Yes, because amplitude and wavelength are directly related so an increase in one would cause an increase in the other.
B. Yes, because amplitude and wavelength are inversely related so an increase in one would cause a decrease in the other.
C. No, because amplitude and wavelength are not related to one another and therefore changing one does not affect the other at all.
D. No, because amplitude and wavelength are the same thing.

26. Which is strong enough to kill harmful bacteria in food?
A. radio waves
B. microwaves
C. gamma rays
D. infrared rays

27. Which has a longer wavelength than that of blue light?
A. gamma rays
B. radio waves
C. x-rays
D. ultraviolet rays

28. Which wavelength in the visible light spectrum carries more energy?
A. red
B. green
C. violet
D. blue

29. Which is used in doctor’s offices and airports?
A. gamma rays
B. radio waves
C. ultraviolet rays
D. x-rays

30. Which wave carries more energy?
A. x-rays
B. microwaves
C. ultraviolet rays
D. visible light rays

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Experiment: effect of solution concentration on reaction rate you have learned that as the concentration of reactants increases, there will most likely be a greater number of collisions, and hence increase the rate of a reaction. in this experiment, you will see a demonstration of this, with a twist. there will be three reactions going on in this experiment. objectives determine how solution concentration can affect the rate of a reaction. the first reaction will be a reaction of the iodide ion (i-1) with hydrogen peroxide (h2o2) in an acidic solution. this reaction produces a slightly orange solution. in our experiment, we will add some orange food coloring to make this solution more orange. 2 h+ (aq) + 2 i- (aq) + h2o2 (aq) ⟶ i2 (aq) + 2 h2o (l) the next reaction will be between the iodine and starch i2 + starch ⟶ i2-starch complex (blue-black) so, when starch is added to the iodine solution made from the first reaction, the solution will turn black immediately, so it is difficult to find the rate of reaction. in order to be able to time this reaction, you will slow it down with another reaction. adding ascorbic acid will react with the iodine, reducing the concentration of the iodine available to react with the starch. c6h8o6 (aq) + i2 (aq) ⟶ 2i- (aq) + c6h6o6 (aq) + 2 h+ (aq) when the ascorbic acid is used up, the remaining iodine molecules can react with the starch and form the black color. the more ascorbic acid you add, the slower the reaction to form the iodine-starch complex will be. use your data and observations to complete the assignment. analysis and conclusions submit your data and the answers to these questions in the essay box below. what was your hypothesis? plot your data as drops of ascorbic acid vs. time. as the concentration of ascorbic acid was increased, did the rate of the formation of the iodine-starch complex increase or decrease? explain your answer in terms of the chemical reactions involved. was your hypothesis correct? make a general rule about the effects of concentration of reactants on reaction rates. for practice, the molecular formula for ascorbic acid is c6h8o6, and you used 6 g in this experiment, calculate the molarity of the ascorbic acid. now calculate the concentration in moles per drop (assume 1 ml = 20 drops).

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Help this is a test 16. The speed of sound usually travels in solids because .
A. faster; t...

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