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3 years ago

Which of the two substances would have a higher melting point: O2 or quartz (SiO2)n? Explain your answer.

Chemistry

1 answer:

sesenic [268]3 years ago

7 0

Answer:

quartz (SiO2)n

Explanation:

Melting point is defined as the temperature or point at which the substances change its state from solid to liquid.

Quartz (SiO2)n has high melting point than O2 because Quartz (SiO2)n is found in the form of hard, crystalline mineral that is made up of silicon and oxygen atoms having strong covalent bonds between all the atoms. So, a lot of energy is required to break the bond between the atoms and it has a high melting point.

Hence, the correct answer is quartz (SiO2)n.

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Classify each of the following properties of a cake as qualitative or quantitative. Give reasons for your answers

VashaNatasha [74]

Answer:

The answer to your question is below

Explanation:

A qualitative property of matter is a property characteristic of a substance like color and flavor.

A quantitative property of matter is a property when we get a number.

A) it's a circular shape is a qualitative property because the shape is a qualitative property and shape is not represented by a number.

B) its mass is 1.5 kg is a quantitative property because we know a number of this mass.

C) it tastes like chocolate is a qualitative property because the flavor is characteristic of a substance and flavor is not measured in numbers.

D) it is 30 cm in diameter it is a quantitative property, we know the exact dimension of it.

E) its icing is melting is a qualitative property, melting is a property of ice, it just happens.

4 0

4 years ago

(i need help please ill give brainliest if u get it right)* the questions and everything are in the picture below*

NemiM [27]

Explanation:im not really sure about this one but i think it is either c or b

ANSWER:C im pretty sure.sorry if wrong

7 0

3 years ago

3. A 50.0 L sample of gas collected in the upper atmosphere at a pressure of 18.3 mmHg is compressed into a 150.0 mL container a

pochemuha

Answer:

a. $P_2=8.03atm$

b. $V_2=0.024L=24mL$

Explanation:

Hello,

a. In this case, we use the Boyle's law as en inversely proportional relationship between pressure and volume:

$P_1V_1=P_2V_2$

Thus, for the given conditions, one computes the new pressure as shown below:

$P_2=\frac{P_1V_1}{V_2} =\frac{18.3mmHg*50.0L}{150.0mL*\frac{1L}{1000mL} }*\frac{1atm}{760mmHg} \\ \\P_2=8.03atm$

b. Now, we should find the final volume for a new pressure of 10 atm:

$V_2=\frac{P_1V_1}{P_2} =\frac{50.0L*18.3mmHg*\frac{1atm}{760mmHg} }{50atm}\\ \\V_2=0.024L=24mL$

Best regards.

4 0

3 years ago

In mitosis, how does a daughter cell compare with its parent cell?

Delicious77 [7]

A. A daughter cell and its parent cell are exact
copies of each other.

3 0

3 years ago

What is the mass of 2 mol of NH3?.

Shkiper50 [21]

Mass of 2 mol of NH3 is 34 grams.

The number of moles of a substance is equal to the ratio of its given mass in a chemical reaction to the mass of one mole of that substance. One mole of any substance will be equals Avogadro's number, that is, 6.023 × 1023. It is also used to express concentration units such as mole per litre or molecular weight.

Mass which is symbolized as m, it is a dimensionless quantity that is representing the amount of matter in a particle or object. The standard unit of mass in the International System (SI) is the kilogram.

To calculate the mass of NH3 we use the below formula;

number of moles = <u>weight of the substance </u>

Molecular weight

weight = number of moles × Molecular weight

weight = 2 × 17 ⇒ 34 grams

To know more about mass

brainly.com/question/21342570

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3 0

1 year ago