All categories

3 years ago

Question 18 of 32

Chemistry

1 answer:

guajiro [1.7K]3 years ago

8 0

Answer: A. A bond in which molecules share electrons

You might be interested in

A mixture of nitrogen gas and oxygen gas has a total pressure of 123.5 kPa. If the

ASHA 777 [7]

Answer: 19kpa

Explanation:

The total pressure of a mixture of gases is the sum of the partial pressure exacted by the individual gases.

P total = P X + P Y

From the question above:

P total = P .nitrogen + P. oxygen

123.5kpa = 104.5kpa + P. Oxygen

P. Oxygen = 123.5kpa - 104.5kpa

= 19kpa

6 0

4 years ago

When 2.714 g of AX (s) dissolves in 127.4 g of water in a coffee-cup calorimeter the temperature rises from 23.3 °C to 37.1 °C.

MakcuM [25]

Answer : The enthalpy change for the solution is 166.34 kJ/mol

Explanation :

First we have to calculate the enthalpy change of the reaction.

Formula used :

$\Delta H=mC\Delta T\\\\\Delta H=mC(T_2-T_1)$

where,

$\Delta H$ = change in enthalpy = ?

C = heat capacity of water = $4.18J/g.K$

m = total mass of sample = 2.174 + 127.4 = 129.6 g

$T_1$ = initial temperature = $23^oC=273+23=296K$

$T_2$ = final temperature = $37.1^oC=273+37.1=310.1K$

Now put all the given values in the above expression, we get:

$\Delta H=mC(T_2-T_1)$

$\Delta H=129.6g\times 4.18J/g.K\times (310.1-296)K=7638.36J$

Now we have to calculate the moles of AX added to water.

$\text{ Moles of }AX=\frac{\text{ Mass of }AX}{\text{ Molar mass of }AX}=\frac{2.714g}{59.1097g/mole}=0.04592moles$

Now we have to calculate the enthalpy change for the solution.

As, 0.04592 moles releases heat = 7638.36 J

So, 1 moles releases heat = $\frac{7638.36}{0.04592}=166340.59J=166.34kJ$

Therefore, the enthalpy change for the solution is 166.34 kJ/mol

7 0

3 years ago

Which statement is true about sodium hydroxide (NaOH)?

Leokris [45]

Answer: D. It is a base because it increases the concentration of hydroxide ions.

Explanation: A base is a substance which dissociates to give hydroxide ions in water.

An acid is a substance which dissociates to give hydrogen ions in water.

$NaOH\rightarrow Na^++OH^-$

So $NaOH$ is a base as it gives $OH^-$ ions when dissolved in water.

5 0

3 years ago

Are cells reproduced sexually

Vanyuwa [196]

I think that cells are reproduced sexually because i dont think there's another option. Right?

7 0

3 years ago

Read 2 more answers

Determine the compound type for the following formulas

sladkih [1.3K]

C₁₂H₂₂O₁₁ , Mg(OH)₂ , H₂O ,Cu₃Zn₂ , Au are covalent compound,

Ionic Compound ,covalent compound ,metallic compound, metal respectively.

The missing question is

Determine the compound type for the following formulas

C₁₂H₂₂O₁₁ , Mg(OH)₂ , H₂O ,Cu₃Zn₂ , Au

<h3>What are the different types of compound?</h3>

The compounds by the exchange of electrons are called Ionic Compound, Those formed by sharing of electrons is called a covalent compound.

It is given in the question to determine the type of the compounds

1. C₁₂H₂₂O₁₁: It is a covalent compound

2. Mg(OH)₂: It is an Ionic Compound

3. H₂O: It is a covalent compound

4. Cu₃Zn₂: It is a metallic compound

5.Au: It is a metal

To know more about Different types of compound

brainly.com/question/8627975

#SPJ1

3 0

3 years ago