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Vilka [71]
4 years ago
14

What is one element in the same family as oxygen?

Chemistry
1 answer:
Lady bird [3.3K]4 years ago
7 0

Answer: sulfur, selenium, tellurium and polonium

Fact: The oxygen family is in group 16 of the perodic table.

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An ideal gas is confined to a cylinder by a piston. The piston is slowly pushed in so that the gas temperature remains at 20 deg
HACTEHA [7]

Answer:

vhgbvbhdf

Explanation:

(a) It is given that the gas is ideal. Formula for change in entropy of the gas according to the first law of thermodynamics is as follows.

       \Delta U = dQ - dW

For isothermal process, \Delta U = 0 at constant temperature.

So,   \Delta U = dQ - dW

      0 = dQ - dW

or,       dQ = dW = 730 J

Now, according to the second law of thermodynamics the entropy change is as follows.

           \Delta S = \frac{dQ}{dT}

                        = \frac{730 J}{293.15 K}

                        = 2.490 J/K

Therefore, the entropy change of the gas is 2.490 J/K.

(b)  In the given process, at constant temperature the gas will be compressed slowly because then kinetic energy of the gas molecules will also be constant. The volume decreases so that the movement of molecules increases as a result, entropy of molecules will also increase.

This means that \Delta S = 2.490 J/K > 0

3 0
3 years ago
When a neutral atom loses an electron, it forms an ion with a positive charge called a _________? Question 1 options:
Black_prince [1.1K]
It should be C) cation
8 0
3 years ago
Read 2 more answers
Sodium and chlorine can be extremely dangerous in their elemental form. how is it possible that we can eat them in a compound?
Advocard [28]
Because it neutralizes, therefore becoming something safe that we can eat. Na+ Cl- = NaCl
7 0
3 years ago
What happens when water is exposed to air and contains CO2 ?
astra-53 [7]

Answer: B

Explanation:

Co2 isn't an acid

5 0
3 years ago
H3PO4 + Ca(OH)2 → Ca(H2PO4)2 + H2O
aniked [119]

Given question is incomplete. The complete question is as follows.

Balance the following equation:

H_3PO_4 + Ca(OH)_2 \rightarrow Ca(H_2PO_4)_2 + H_2O

Answer: The balanced chemical equation is as follows.

2H_3PO_4 + Ca(OH)_2 \rightarrow Ca(H_2PO_4)_2 + 2H_2O

Explanation:

When a chemical equation contains same number of atoms on both reactant and product side then this equation is known as balanced equation.

For example, H_3PO_4 + Ca(OH)_2 \rightarrow Ca(H_2PO_4)_2 + H_2O

Number of atoms on reactant side:

H = 5

P = 1

O = 6

Ca = 1

Number of atoms on product side:

H = 6

P = 2

O = 9

Ca = 1

In order to balance this equation, we will multiply H_3PO_4 by 2 on reactant side and we will multiply H_2O by 2 on product side. Hence, the balanced chemical equation is as follows.

2H_3PO_4 + Ca(OH)_2 \rightarrow Ca(H_2PO_4)_2 + 2H_2O

8 0
3 years ago
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