Which of the following statements about electromagnetic and mechanical waves is true?
A....
Which of the following statements about electromagnetic and mechanical waves is true?
A. Electromagnetic waves must travel through a medium, but mechanical waves do not require a medium.
B. Mechanical waves must travel through a medium, but electromagnetic waves do not require a medium.
C. Mechanical waves sometimes travel through a vacuum, and electromagnetic waves sometimes travel through matter.
D. Electromagnetic waves travel mostly through matter, and mechanical waves travel mostly through a vacuum.
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Choose all the answers that apply. ionic compounds dissolve easily in water do not dissolve in water have low melting points have high melting points conduct electricity when melted
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Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.
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