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jarptica [38.1K]
2 years ago
9

10. Sound is characterized in how many ways? A. 5 B. 3 C. 4 D. None of the above

Chemistry
2 answers:
Elodia [21]2 years ago
8 0

Answer:

A . 5...................

BigorU [14]2 years ago
8 0
The answer is 5 have a great day!!
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which two quantities are used to predict gravitational force according to Newton's law of universal gravitation a. mass and spee
NISA [10]

Answer:

(b). Mass and distance.

Explanation:

The gravitational force between two objects is given by Newton's law of universal gravitation. The formula is as follows :

F=G\dfrac{m_1m_2}{r^2}

Here,

G is universal gravitational constant

r is the distance between two objects

It is very clear that the gravitational force is directly proportional to the product of masses and inversely proportional to the square of the distance between them.

Hence, the two quantities are used to predict gravitational force according to Newton's law of universal gravitation are mass and distance.

7 0
3 years ago
Hc2h3o2(aq)+h2o(l)⇌h3o+(aq)+c2h3o−2(aq) kc=1.8×10−5 at 25∘c part a if a solution initially contains 0.260 m hc2h3o2, what is the
Cloud [144]

Answer : The equilibrium concentration of H_3O^+ at 25^oC is, 2.154\times 10^{-3}m.

Solution : Given,

Equilibrium constant, K_c=1.8\times 10^{-5}

Initial concentration of HC_2H_3O_2 = 0.260 m

Let, the 'x' mol/L of H_3O^+ are formed and at same time 'x' mol/L of HC_2H_3O_2 are also formed.

The equilibrium reaction is,

                  HC_2H_3O_2(aq)+H_2O(l)\rightleftharpoons H_3O^+(aq)+C_2H_3O_2^-(aq)

Initially                0.260 m                       0                 0

At equilibrium    (0.260 - x)                     x                 x

The expression for equilibrium constant for a given reaction is,

K_c=\frac{[H_3O^+][C_2H_3O_2^-]}{[HC_2H_3O_2]}

Now put all the given values in this expression, we get

1.8\times 10^{-5}=\frac{(x)(x)}{(0.260-x)}

By rearranging the terms, we get the value of 'x'.

x=2.154\times 10^{-3}m

Therefore, the equilibrium concentration of H_3O^+ at 25^oC is, 2.154\times 10^{-3}m.

4 0
3 years ago
30 points and brainliest answer for the right answers! :(
Rashid [163]
I think number one is c not sure or not number 2 is C AND NUMBER 3 IS 1 Go with sliding friction  number 2 go with rolling friction number 3 is static friction and 4 is force 
8 0
3 years ago
Which of the following examples best represent the levels of organization from least to most complex in humans
Anika [276]
I’d say C not sure though
5 0
2 years ago
Which of the following is the best way to explain how baking a cake or frying an egg is a chemical change?
Bezzdna [24]

Answer:

I think C if not then B

Explanation:

Heat will change the product and will become a chemical change.

8 0
3 years ago
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