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MissTica
3 years ago
9

How does wavelength affect the pitch of a sound?

Chemistry
1 answer:
boyakko [2]3 years ago
3 0

Answer:

D

Explanation:

because the higher the wavelength the shorter the pitch and the shorter the wavelength the higher the pitch

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How would increasing the original concentration of a weak acid affect its ka and pka?
Inessa [10]

Answer: C. K_a would increase and pK_a would decrease.

Explanation:

HA\rightleftharpoons H^++A^-

initially conc.       c       0         0

At eqm.  c(1-\alpha)   c\alpha      c\alpha

The expression for dissociation constant is,

K_a=\frac{c\alpha\times c\alpha}{c(1-\alpha)}

for weak acid, \alpha is very very small , the expression will be,

K_a=\frac{c^2\alpha^2}{c}=c\alpha^2

K_a=c\alpha^2As k_a is directly proportional to concentration, the value of K_a would increase on increasing the concentration.

pK_a=log\frac{1}{K_a}

Thus if K_a would increase, pk_a would decrease.

8 0
3 years ago
A 1.5-m 3 insulated rigid tank contains 2.7 kg of carbon dioxide at 100 kPa. Now paddle-wheel work is done on the system until t
Assoli18 [71]

Answer:

The entropy change of carbon dioxide = 0.719 kJ/k

Explanation:

Given:

1.5 m - 3 insulated rigid tank contains 2.7 kg of carbon dioxide at 100 kPa

The objective is to determine the entropy change of carbon dioxide

Formula used:

ΔS=

Solution:

On considering,

C_{P} =0.846 kJ/kg K\\C_V=0.657 kJ/kg k\\

ΔS=mc_{v} lu\frac{p_{2} }{P_{1} }

On substituting the values,

ΔS=2.7*0.657lu\frac{150}{100}

ΔS=0.719 kJ/k

4 0
3 years ago
How can you separate the components soil and water
Vaselesa [24]

Answer:

Put the soil in one area and keep the water heated so the water can evaporate.

Explanation:

8 0
3 years ago
6.
frez [133]

Answer:

Ni^2+

Explanation:

The following data were obtained from the question:

Proton = 28

Electron = 26

Neutron = 34

Next, we shall determine the atomic number of the element.

Atomic number of an element is simply defined as the number of protons in the atom of an element.

Thus,

Atomic number = proton number

Proton = 28

Atomic number = proton number = 28

Atomic number = 28

Therefore, the element is Nickel since no two elements have the same atomic number.

Finally, we shall determine the charge on the Nickel atom as follow:

Proton = 28

Electron = 26

Charge on atom =

Charge on atom = Proton – Electron

Charge on atom = 28 – 26

Charge on atom = +2

Therefore, we can represent the Particle as Ni^2+

4 0
3 years ago
Explain how the periodic table is arranged and why it is a helpful tool in our study of chemistry. Write in complete sentences a
frosja888 [35]
The periodic table is grouped by the properties of each element. They are also arranged in the order of their atomic mass.  Different rows of elements are called periods. If elements lie in the same column, they are in the same group. It is helpful to us today because it helps us gain new information on the properties and the world around us. We would not have a true understanding of Chemistry if it were not for the period table.

3 0
4 years ago
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