CHEMISTRY HIGH SCHOOL

What is a polar molecule

Answers

Answer 1

Answer:

Answer:

Here, I hope this helps

Explanation:

Answer 2

Answer:

Answer:

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Explanation:

A polar molecule is a chemical species in which the distribution of electrons between the covalently bonded atoms is not even. Each atom has a certain electro-negativity. When bonded to another atom, the atom with the higher electro-negativity will tend to attract more electrons.

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What type of reaction is shown below? CH4 + 2O2?CO2 + 2H2O + heat
Igneous rocks with an andesitic composition ________.

Which element is malleable and a good conductor of electricity at STP?(1) argon (3) iodine
(2) carbon (4) silver

Answers

Answer: The correct answer is option(4).

Explanation:

Malleability : It is a property of a material that under the pressure they can be drawn into thin sheets.

Conducting: It is a property of a material to allow electric current to easily pass through it.

Since both the above properties are of metals. And from the enlisted elements only one element is metal that is 'silver'.

So, the correct answer is option(4).

$\boxed{\left( 4 \right){\text{ silver}}}$ is the element that is malleable and a good conductor of electricity at STP.

Further Explanation:

The representation of all the elements in their increasing atomic numbers is known as the periodic table. Such a representation is done in the form of a table having horizontal rows called periods and vertical columns called groups.

Malleability is the property of substance due to which it can be deformed by applying pressure. The malleable materials can be drawn into thin sheets by the process of rolling or hammering. Metals are malleable in nature because these have the tendency to get deformed under pressure.

Any substance that allows the flow of electric charges through it is said to be a conductor. Conductivity is defined as the property of any conductor to permit the flow of charges through it. Metals are good conductors of heat and electricity due to the presence of free electrons in them. Such electrons act as charge carriers.

Both malleability and conductivity are the properties of metals. Since silver exists as a metal at STP, it is malleable and a good conductor of electricity. But carbon, argon and iodine are non-metals at STP so these cannot exhibit any of the mentioned properties. Therefore option (4) is correct.

Learn more:

Which property do metalloids share with nonmetals? brainly.com/question/802690
Which properties are characteristic of group 2 elements? brainly.com/question/8226316

Answer details:

Grade: High School

Chapter: Periodic classification of elements

Subject: Chemistry

Keywords: element, silver, carbon, iodine, argon, conductor, periodic table, metal, non-metals, malleability, electricity, electrons, charge carriers.

a mixture of oxygen, hydrogen, and nitrogen gases exerts a total pressure of 282 kpa. if the partial pressures of oxygen and hydrogen are 110 kpa and 106 kpa respectively, what is the partial pressure exerted by nitrogen?

Answers

Answer : The partial pressure of $N_2$ is, 66 Kpa

Solution :

According to the Dalton's law, the total pressure of the gas is equal to the sum of the partial pressure of the mixture of gasses.

$P_T=p_(N_2)+p_(O_2)+p_(H_2)$

where,

$P_T$ = total partial pressure = 282 Kpa

$P_(N_2)$ = partial pressure of nitrogen = ?

$P_(O_2)$ = partial pressure of oxygen = 110 Kpa

$P_(H_2)$ = partial pressure of hydrogen = 106 Kpa

Now put all the given values is expression, we get the partial pressure of the nitrogen gas.

$282Kpa=p_(N_2)+110Kpa+106Kpa$

$p_(N_2)=66Kpa$

Therefore, the partial pressure of $N_2$ is, 66 Kpa

pressures oxygen and hydrogen + pressure nitrogen

110 Kpa + 106 Kpa = 216 Kpa

Partial pressure:

total pressure - exerted by nitrogen:

282 Kpa - 216 Kpa

= 66 Kpa

hope this helps!

Which solution reacts with LiOH(aq) to produce a salt and water?

Answers

2 LiOH + H₂SO₄= 2 H₂O + Li₂SO₄

is sulfuric acid ( H₂SO₄) producing H₂O and Li₂SO₄ ( Lithium sulfate)

hope this helps!

Find the molarity of the following solutions: 0.5 moles of sodium chloride is dissolved to make 0.05 liters of solution.

Answers

M(molarity)=moles/volume
M=.5mol/.05L=10M

A scientist wants to perform a controlled experiment to test the effect of rust on chemically treated iron. which action would be most important to perform in a controlled experiment? design an experiment that is based on previously published results. expose the treated iron to the corrosive effects of the air. test a large piece of treated iron and a small piece of untreated iron. test a piece of treated iron and a piece of untreated iron under the same conditions.

Answers

Answer: Option (d) is the correct answer.

Explanation:

A test or experiment in which only one variable is changed at a time in order to verify the result is known as a controlled experiment.

That is only independent variable need to be adjusted with respect to the dependent variable.

Thus, we can conclude that the action to test a piece of treated iron and a piece of untreated iron under the same conditions would be most important to perform in a controlled experiment in the given situation.

the answer is to test a piece of untreated and treated under same conditions!

What is special about nitrogen?
and what is it main function?

Answers

Nitrogen is present in many spheres of the Earth, including the atmosphere and biosphere. Nitrogen makes up around 80% of the atmosphere (more than oxygen), and exists as a diatomic molecule. it's also essential in the function of plants, as the most commonly used mineral nutrient. It is also used in photosynthesis and is a major component of amino acids which make protein.

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