CHEMISTRY COLLEGE

Zinc is put in concentrated sodium hydroxide

Answers

Answer 1
Answer: Zinc is dissolved in sodium hydroxide:
Zn + 2NaOH {concentrated} + 2H2O = Na2[Zn(OH)4] + H2↑

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MIDDLE SCHOOL

1. Is this equation balanced? Explain your answer. Na + Cl2 → NaCl ?

Answers

It is not balanced since there are 2 Cl molecules on the left side, and only 1 on the right side. In order to balance this, you would need to make sure there are the same amount of all the molecules on both sides...

4Na + 2Cl2 = 4NaCl


Hope this helps :)

MIDDLE SCHOOL

Which of the following is an example of heat transfer through conduction? a pan on the stove getting hot
hot air rising inside a house
the Sun drying clothes hanging outside
a microwave warming a cup of water

Answers

Answer:

a pan on the stove getting hot

Explanation:

Conduction is type of heat transfer that involves vibration of particles transferring heat to the ones next to them by collisions. So it requires contact between substances.

Hot air rising is convection which is typical of fluids. The sun drying our clothes is radiation of waves from the sun. And microwaves as the name suggestion heats through radiation of waves. A pan on the stoves however relies on the physical contact between the stove and the pan. So particles of the stove vibrate colliding with the pan particles transferring energy

A pan on the stove getting hot, because the pan is conducting the heat from the stove.
HIGH SCHOOL

How many miles of co2 are produced if 5.0 moles of c10h22 react with an excess of o2?

Answers

The balanced equation for the above reaction is as follows;
2C₁₀H₂₂ + 31O₂ ---> 20CO₂  + 22H₂O
stoichiometry of C₁₀H₂₂ to CO₂ is 2:20
this means that for every 2 mol of C₁₀H₂₂ that reacts - 20 mol of CO₂ is formed 
therefore when 5.0 mol of C₁₀H₂₂ reacts - 20/2 x 5.0 = 50 mol of CO₂ is formed 
50 mol of CO₂ is produced.
COLLEGE

The bonding found in calcium chloride is

Answers

The bonding found in calcium chloride is ionic bonds. 

I hope this helps!
COLLEGE

It’s sometimes said that water is a “universal solvent.” Do a little research on this term. Why do some people call it this? What aspect of its structure makes it a good solvent? If a “universal solvent” could dissolve anything, what problems might you imagine that would cause in everyday life?

Answers

Water is called "universal solvent" because it is capable of dissolving various types of substances than any other solvent. The water's chemical composition such as its atoms that have a balance electrical charge and arrangement of polar makes it capable of dissociating different ionic compounds and balanced attraction to sodium and other elements, suitable to nature of any substances or life forms. However, this could be a problem in everyday life because given the title "universal solvent", it does not necessarily dissolve every compound. For example: water alone cannot be used in cleaning oils because it can't dissolve waxes and fats, and in dissolving large amounts of salt or sugar in our body.
HIGH SCHOOL

Which statement best describes how a catalyst increases the rate of a reaction? (1) The catalyst provides an alternate reaction pathway with a higher activation energy.
(2) The catalyst provides an alternate reaction pathway with a lower activation energy.
(3) The catalyst provides the same reaction pathway with a higher activation energy.
(4) The catalyst provides the same reaction pathway with a lower activation energy.

Answers

A catalyst "provides an alternate reaction pathway with a lower activation energy". (2) is the correct answer.

Activation energy is the energy needed to conduct a chemical reaction. When a catalyst is put into the system, it makes the system require less activation energy, making the reaction go faster.

Hope this is helpful~ 
HIGH SCHOOL

Can you determine the atomic weights of zinc or copper by the methods used in this experiment? how? what additional information is necessary in order to do this?

Answers

The subatomic particle that carries a positive charge is the proton. You can also know the number of protons in an atom. The number of protons is the atomic number of an element. To find the number of neutrons, subtract the atomic number from the mass of an atom. 


For zinc:

Zinc’s atomic number is 30. This will tell us that zinc has 30 protons and electrons that are in it. The atomic mass of zinc is 65. So subtract 65 from 30 gives us 35. Therefore, there are 35 neutrons in zinc.


For copper:

Copper’s atomic number is 29. This will tell us that copper has 29 protons and electrons that are in it. The atomic mass of copper is 64. So subtract 64 from 29 gives us 35. Therefore, there are 35 neutrons in copper.

MIDDLE SCHOOL

What are the differences between thermoplastics and thermosetting plastics? Give examples and draw a simple diagram to show what kind of linkages are there in the polymer chains.

Answers

on the basis of the reaction of heat in plastic , their are two types of plastics :

Thermoplastic & Thermosetting plastics

Thermoplastics : Plastics which easily get deformed (become soft )on heating and also get bend easily are known as thermoplastics .

examples :  polythene , polyvinyl  chloride and polystyrene .

thermosetting plastics : plastics which once moulded into a shape do not become soft on heating and cannot be moulded again are called thermosetting plastics .

examples : bakelite , melamine and formica

MIDDLE SCHOOL

Ll of the following could be considered reconstruction except : A. scientists assume an area was once undersea due to the types of rock deposits
B. scientists assume an animal was a meat eater because of the teeth in its fossil
C. scientists assume an animal could climb trees because of its hand structure
D. scientists predict a volcano will erupt in the near future because of current volcanic activity

Answers

Answer: -

D. scientists predict a volcano will erupt in the near future because of current volcanic activity

Explanation: -

Reconstruction involves analyzing evidence present to understand what happened before. For example scientists assume an area was once undersea due to the types of rock deposits. The area was under sea before.

Scientists assume an animal was a meat eater because of the teeth in its fossil. Again the animal was before.

Scientists assume an animal could climb trees because of its hand structure . The animal existed before. Now no longer present.

But in D scientists predict a volcano will erupt in the near future because of current volcanic activity, the event of eruption could occur in the future. It has not happened already like in the previous cases.

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