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marysya [2.9K]
3 years ago
7

Explain how ethene is produced using the apparatus in Figure 4. This is a three mark question.

Chemistry
1 answer:
harina [27]3 years ago
4 0

Answer:

- when the decane is heated it vaporises/turns to a gas

- decane vapour/gas breaks down as it comes into contact with hot porous pot

- large molecules of decane produce smaller molecules, including ethene

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Explain in terms of atomic structure why the atomic radius of K is larger than that of Na
Lina20 [59]

Answer:

Potassium (K) has a larger average atomic radius (220 pm) than sodium (Na) does (180 pm). The potassium atom has an extra electron shell compared to the sodium atom, which means its valence electrons are further from the nucleus, giving potassium a larger atomic radius. The ionic radius increases in a particular group on moving from top to bottom due to increase in the principle energy shell though the number or electrons in the valence shell remain the same

3 0
3 years ago
Distance divided by time
son4ous [18]
150÷3=50

350÷4=87.5

(50+87.5)÷2

137.5÷2

=68.75
4 0
3 years ago
Which color of visible light has the shortest wavelength?
Otrada [13]

Answer:

Hi! Your answer should be (C.) violet

Explanation:

Violet had the shortest wavelength, at around 380 nanometers. Red has the longest wavelength, at around 700 nanometers. Hope this helps!

8 0
3 years ago
Read 2 more answers
draw the lewis structure for CO2, H2CO3, HCO3-, and CO3 2-.Rank these in order of increasing attraction to water molecules. Expl
gavmur [86]

Answer:

The structures are attached in file.

Hydrogen bonding and intermolecular forces is the reason for ranks allotted.

Explanation:

In determining Lewis structure, we calculate the overall number of valence electrons available for bonding.  Making carbon (the least electronegative atom) the central atom in the structure, we allocate valence electrons until each atom has achieved stability.

In order of decreasing affinity to water molecules:

CO_{3}^{2-}  > HCO_{3} ^{2-} > H_{2} CO_{3}

This is due to the fact that the CO_{3}^{2-}will accept protons more readily than the bicarbonate ion, HCO_{3} ^{2-}. Carbonic acid, H_{2} CO_{3} will not accept any more protons, hence it is the least attractive to water molecule, even though soluble.

3 0
3 years ago
A sample of 02 gas occupies 346 mL at 45°C and 1.50 atm. What is the volume of this O2 gas sample at STP? Enter your answer in t
sladkih [1.3K]

<u>Answer:</u> The volume of oxygen gas at STP is 446 mL

<u>Explanation:</u>

STP conditions are:

Pressure of the gas = 1 atm

Temperature of the gas = 273 K

To calculate the volume when temperature and pressure has changed, we use the equation given by combined gas law. The equation follows:

\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}

where,

P_1,V_1\text{ and }T_1 are the initial pressure, volume and temperature of the gas

P_2,V_2\text{ and }T_2 are the final pressure, volume and temperature of the gas

We are given:

P_1=1.50atm\\V_1=346mL\\T_1=45^oC=(45+273)K=318K\\P_2=1atm\\V_2=?\\T_2=273K

Putting values in above equation, we get:

\frac{1.50atm\times 346mL}{318K}=\frac{1atm\times V_2}{273K}\\\\V_2=446mL

Hence, the volume of oxygen gas at STP is 446 mL

5 0
3 years ago
Read 2 more answers
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