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3 years ago

Gold melts at 1064 c. Melting point is a ___.

Chemistry

2 answers:

Tasya [4]3 years ago

8 0

Physical property .

zlopas [31]3 years ago

6 0

Answer:

i would say Chemical property

Explanation:

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How many 20.0-g ice cubes are required to absorb 47.0 kJ from a glass of water upon melting?

Sati [7]

Hello!

The number of 20-g ice cubes required to absorb 47 kJ from a glass of water upon melting is 7 icecubes

Why?

We are going to clear from the equation of the released heat, the mass of ice (m). The specific latent heat of fusion of ice is 336 kJ/kg:

$Q=m*L\\ \\ m=\frac{Q}{L}=\frac{47 kJ}{336 kJ/kg}=0,1399 kg=139,88 g\\ \\ 139,88g*\frac{1 icecube}{20g}=6,99=7icecubes$

So, 7 ice cubes are required to absorb that amount of heat from the glass of water.

Have a nice day!

3 0

3 years ago

The empirical formula of an organic compound is C2H4O. The molecular mass of the compound is 176g/mol.

Brrunno [24]

Answer:

The molecular formula of the compound is $C_{8}H_{16}O_{4}$ . The molecular formula is obtained by the following expression shown below

$\textrm{Molecular formula }= n\times \textrm{Empirical formula}$

Explanation:

Given molecular mass of the compound is 176 g/mol

Given empirical formula is $C_{2}H_{4}O$

Atomic mass of carbon, hydrogen and oxygen are 12 u , 1 u and 16 u respectively.

Empirical formula mass of the compound = $\left ( 2\times12+4+16 \right ) \textrm{ u} = 44 \textrm{ g/mol}$

$n = \displaystyle \frac{\textrm{Molecular formula mass}}{\textrm{Empirical formula mass}} \\n = \displaystyle \frac{176}{44} = 4$

$\textrm{Molecular formula }= n\times \textrm{Empirical formula}$

Molecular formula = 4 $\times$ $C_{2}H_{4}O$

Molecular formula is $C_{8}H_{16}O_{4}$

6 0

3 years ago

The type of radiation which is identical to a high energy electron is known as a(n). beta, alpha, or gamma particles

Schach [20]

The type of radiation which is identical to a high energy electron is known as a(n) beta.

Answer: A) or the first option.

5 0

4 years ago

Read 2 more answers

Consider a 400 mL solution of 0.10 M \ce{NaOH}NaOH. Calculate the mass of solid \ce{NaOH}NaOH required to achieve this solution.

AnnyKZ [126]

Answer:

Is 40.10 ml

Explanation:

i've dome it before

3 0

2 years ago

What is the mass of 4,48 L of SO2 at STP?

Trava [24]

Answer:

2 moles

Explanation:

Hi there !!

Given volume = 44.8 litres

Molar volume = 22.4 litres

No: of moles = Given volume / Molar volume

= 44.8 / 22.4 = 2 moles

3 0

3 years ago

Read 2 more answers