CHEMISTRY MIDDLE SCHOOL

Which compound is an electrolyte?(I) CH3CHO (3) CH3COOH

(2) CH3OCH3 (4) CH3CH2CH3

Answers

Answer 1
Answer: Ch3COOH is an electrolyte for sure. So option “C” is the correct answer for this question. Electrolyte is actually a compound that dissolves easily in water and creates a solution that becomes a good conductor of electricity. The reason why the solution becomes a good conductor of electricity is due to the presence of free ions. There can be both strong and weak electrolytes. The compounds that release small number of free ions on dissolving in water are called weak electrolytes and those that release large number of ions are strong electrolytes.


Answer 2
Answer:

The Correct answer is CH3COOH

The explanation:

when the electrolyte is: A substance that dissociates into ions in solution and acquires the capacity to conduct electricity.

- Electrolyte is actually a compound that dissolves easily in water and creates a solution that becomes a good conductor of electricity.

- The existence of free ions is the reason why the solution becomes a good conductor of electricity.

-The compounds that release small number of free ions on dissolving in water are called weak electrolytes

-and those that release large number of ions are strong electrolyte.

acetic acid partially dissociates in water to form two ions, H+ and CH3COO- , therefore making it a weak electrolyte

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Sound _____..Travels in longitudinal waves

.Can travel through a vacuum

.Travels most slowly through a gas

.Speeds up when temperature is increased

.Is caused by vibration

Answers

the answer is the first one that say Travels in longitudinal waves
It travels in longitudinal waves.

If a certain gas occupies a volume of 10 L when the applied pressure is 5.0 atm , find the pressure when the gas occupies a volume of 2.5 L .

Answers

We assume the change in volume occurs at constant temperature and so we  use the Boyle's law formula P_1V_1=P_2V_2.

We are given the initial volume and pressure as well as as final volume, the question wants the final pressure P_2

So we make P_2 the subject of the formula

P_2= (P_1 V_1)/(V_2) = (5*10)/(2.5)= 20 atm

suppose you increase the mass of wood you are burning in a fireplace. what will happen to the total mass of ash what will happen to the total mass of ash,gases,and water vapor

Answers

Due to the law of conservation of mass, the mass in the end of the change will remain the same.

What is the mass of oxygen in 250 g of sulfuric acid H2SO4?

Answers

Hi,

Here is the step by step procedure to find the answer:

First of all we need to find out the molecular mass of H2SO4

  • H = 1.008
  • S = 32.065
  • O = 16

So mass of H2 SO4 will be : (2x1.008) + (1x32.065) + (16x4)

                                          = 98.081 g/mole  

This shows that 1 mole of H2So4 contain 98 grams.

Now we need to fin out the no. of moles of H2SO4 in 250 grams

                                    250 g x (1mole/250g)

                                           = 2.5489 moles

Now we need to find out how many moles of oxygen are present in 2.5489 moles of H2SO4.

So, as mentioned in the formula of H2SO4, we can see that four moles of oxygen are present in one mole of H2SO4

It means that 2.5489 moles of H2SO4 contain:

                                      2.5489 x4

                       = 10.19565 moles of oxygen  

Now, it is very simple to determine the mass of 10.19565 moles of oxygen by using the formula:

                                no. of mole= mass/molar mass

                                     10.19565 moles= X/ 16 g

                                            10.19565 x 16= X

                                              X= 163.13 grams  

Therefore,  mass of oxygen in 250 g of H2SO4 is 163.13 grams  

Hope it help!

Does every rock go through the rock cycle, from igneous to sedimentary to metamorphic each time around??? Please answer

Answers

No it does not ALWAYS go through all the stages because each rock forms differently at different rates. Igneous rock can weather to sediement rock, or melt to magma, however this does not necessarily mean it does this every time. It all depends on the temperature, wind, and pressure/heat.

Fill in the blanks with the words in the following list. apron
doing
MSDS
drink
eat
mix
goggles
safety shower
water
acids

Rule number one in laboratory safety is know what you are
doing
.

The best protections from chemical splashes and spills are an ________
to cover your body and _________
for your eyes.

Never
eat
food or
drink
liquids from a lab container, even if it has been thoroughly washed.
Rinse skin thoroughly with
water
after a chemical splash.

A _________
should be used for more significant spills.


Pour
acids
into water, never the other way around.
Do not
mix
chemicals unless you know what the product of the reaction will be.


A _________
describes important safety and reactivity information about a chemical.


Fill in the blanks please

Answers

aprons are used to cover your body (most people use la coats though) and goggles are used to cover your eyes.

A Safety shower should be used for more significant spills.  

An MSDS (Material Safety Data Sheet) describes important safety and reactivity information about a chemical.

I hope this helps.  Let me know in the comments if anything is unclear.
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