All categories

4 years ago

Which statement best compares the properties of compounds and elements that the compounds contain?

Chemistry

2 answers:

makvit [3.9K]4 years ago

5 0

B, they are different, I just took the test

grigory [225]4 years ago

4 0

The answer to this question would be: B.They are different.

A compound will have different characteristics from their element. The interaction of different elements in a compound makes it so. They might have similar or opposite characteristic but it didn't always happen so those answers are not best.

You might be interested in

Can anyone do my Ap environmental science package I will pay you

Phoenix [80]

Answer:

i have taken environmental science so i can help

4 0

3 years ago

Automobile battery acid is 38% H2SO4 and has a destiny of 1.29g/ml. Calculate the molality and the molarity of this solution.

baherus [9]

Answer:

$M=5.0M\\\\m=6.2m$

Explanation:

Hello,

In this case, 38 % is commonly a by mass concentration, meaning that we have 38 grams of solute (sulfuric acid) per 100 grams of solution (water+sulfuric acid):

$38\%=\frac{m_{H_2SO_4}}{m_{H_2SO_4}+m_{H_2O}}$

Hence, we compute the moles of sulfuric acid in 38 grams by using its molar mass (98 g/mol):

$n_{H_2SO_4}=38g*\frac{1mol}{98g}=0.39mol H_2SO_4$

Next, the volume of the solution in litres by using the density of the solution:

$V_{solution}=100g*\frac{1mL}{1.29g}*\frac{1L}{1000mL} =0.0775L$

This is done since the molarity is defined as the ratio of the moles of the solute to the volume of the solution in litres, thus we have:

$M=\frac{n}{V}=\frac{0.38mol}{0.0775L}=5.0M$

On the other hand, the molality is defined as the ratio of the moles of the solute to the mass of the solvent in kilograms, thus, we compute the mass of water (solvent) as shown below:

$m_{H_2O}=100g-38g=62g*\frac{1kg}{1000g}=0.062kg$

So compute the molality:

$m=\frac{n_{solute}}{m_{solvent}}=\frac{0.39mol}{0.062kg}=6.2m$

Regards.

7 0

4 years ago

Read 2 more answers

A metal cylinder contains 1 mol of nitrogen gas at STP. What will happen to the pressure if

tiny-mole [99]

Answer:

Then pressure will double

Explanation:

PV = nRT

P = nRT / V

If all other variables are kept constant, P will be proportional to n i.e

P1 / n1 = P2 / n2

n = 1

P1 = P

n2 = 2

P2 =?

P1 / n1 = P2 / n2

P /1 = P2/2

Cross multiply

P2 = 2P

Therefore, if an additional 1mole of the gas is added, the pressure will double

6 0

3 years ago

Endothermic reactions? I studied them before they were cool explain what thst means

Tpy6a [65]

In case of endothermic reactions the system gains heat from surrounding and thus lead to decrease in temperature of surrounding making it cold as conpared to system and we can feel thus with a drop in temperature.

In case of exothermic reactions the system loses energy and thus itself becomes cold and increase the Temperature of surrounding.

8 0

3 years ago

Aqueous hydrochloric acid reacts with solid sodium hydroxide to produce aqueous sodium chloride and liquid water what is the ter

Lilit [14]

Answer:

1.63 g of H₂O is the theoretical yield

Explanation:

We determine the reactants for the reaction:

HCl, NaOH

We determine the products for the reaction:

H₂O, NaCl

The equation for this neutralization reaction is:

HCl (aq) + NaOH(aq) → NaCl(aq) + H₂O(l)

We use both masses, from both reactants to determine the limiting.

First, we convert the mass to moles.

3.3 g . 1mol / 36.45 g = 0.090 moles of HCl

6.6 g . 1mol / 40 g = 0.165 moles of NaOH

Ratio is 1:1, so for 0.165 moles of hydroxide I need the same amount of acid. I have 0.090 HCl so the acid is the limiting reagent.

Let's work with stoichiometry. Ratio is 1:1, again.

1 mol of acid can produce 1 mol of water

Therefore, 0.090 moles of acid must produce 0.090 moles of H₂O

We convert the moles to mass, to define the theoretical yield

0.090 mol . 18g / 1 mol = 1.63 g

3 0

3 years ago

Read 2 more answers