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3 years ago

Which can be used to identify an unknown substance: mass, melting point density, volume, state of matter

2 answers:

4 0

Physical properties

the characteristics (properties) that can be observed without changing the identity of a substance

Examples of physical properties

mass, color, size, volume, texture, density, state of matter, boiling point, melting point

inysia [295]3 years ago

4 0

Answer:

Melting point

Density

Explanation:

The mass of any two substance can be same so we can distinguish between one Kg of two different substances based on masses.

The volume is again cannot determine the nature of substance.

Similarly with the state of matter we can rule out some possibilities but it cannot be used to identify the nature of a substance.

However melting point is characteristic of a substance. It can be used to identify the unknown substance. In fact in organic chemistry it is one of the property which helps us to determine the nature of compound.

Density can also be used to identify a compound.

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Which of the following values best classifies a bond between 2 atoms as<br> being covalent?

Genrish500 [490]

Answer:

C. An electronegativity difference of less than 1.7 between the atoms

Explanation:

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3 years ago

How many atoms are in a sample of 175 grams of sodium (na)? 1.42 × 10^27 atoms 4.58 × 10^24 atoms 6.68 × 10^-21 atoms 1.26 × 10^

Alenkasestr [34]

Atomic mass Na = 22.99 u.m.a

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4 years ago

A 500.0 g sample of an element at 153.0 °C is dropped into an ice-water mixture. 109.5 g of ice melts and there is still an ice

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I uploaded the answer to a file hosting. Here's link:

tinyurl.com/wtjfavyw

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3 years ago

What volume of oxygen in liters at STP wpuld be required for the combustion of 17.0 grams PH3?

Lynna [10]

First, we need to state the chemical equation for the combustion of PH3

$4PH3\text{ + 8O2 }\to\text{ P4O10 }+6H2O$

And the mass of PH3 is 17.0 grams and we need to know the moles.

In the periodic table, the atomic mass of the P (phosphorus) is 31 and the atomic mass of the H (hydrogen) is 1.

So, you sum the mass of P to the mass of H multiplied by 3 and you obtain this:

$\text{mole}cu\text{lar weight of PH3=31}\cdot1+1\cdot3=34\text{ g PH3/mol}$

With this data, we can search the moles of PH3:

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1 year ago

What amount of SeC16 is needed to produce 4.45 mol of chlorine gas in the

AlladinOne [14]

Answer:

1.48 moles of SeCl6 are needed

Explanation:

Based on the reaction:

SeCl6 + O2 → SeO2 + 3Cl2

<em>1 mole of SeCl6 reacts producing 3 moles of Cl2.</em>

To solve this question we need to use the conversion factor:

1mol SeCl6 = 3mol Cl2

As we want to produce 4.45 moles of Cl2, we need:

4.45 mol Cl2 * (1mol SeCl6 / 3mol Cl2) =

<h3>1.48 moles of SeCl6 are needed</h3>

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3 years ago