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irina1246 [14]
3 years ago
12

Petrol does not catch fire on its own at room temperature. Give Reason

Chemistry
1 answer:
tino4ka555 [31]3 years ago
3 0
Because room temperature is below the ignition temperature of petrol. At this temperature energy in the form of heat, flame, or electric spark is needed to start the reaction.
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Predict the size of the astatine atom compared to that of tellurium
PIT_PIT [208]
 <span>Since Astatine is in period 7 and Te is in period 6, I'm going with At because it has 7 energy levels.</span>
6 0
3 years ago
State and explain which measuring cylinder is the best to use?
andrew-mc [135]

Answer:  

Graduated cylinder

Explanation:

A graduated cylinder is used routinely for measuring volume and is considered more accurate than a beaker because of the permanently-marked incremental graduations incorporated in the clear cylinder.

<u><em>PLS MARK BRAINLIEST</em></u>

6 0
3 years ago
3. Explain how tectonic plate movement could create another supercontinent like Pangaea.
Zinaida [17]
Well transform boundaries are when 2 plates rub against each other and convergent boundaries and when plates come together and divergent boundaries are when plates move apart. So eventually one plate will collide into another then will another then again until it forms a Pangea
4 0
3 years ago
Read 2 more answers
Calculate the inner diameter of the steam tube between the boiler and the high pressure turbine if the average velocity of the s
stich3 [128]

Answer:

The inner diameter of the steam tube is 0.1185 m.

Explanation:

m=\rho \times A\times v=\frac{1}{V}\times A\times v

m = mass flow rate

\rho = density of the liquid

V=specific volume =\frac{1}{\rho }

v = velocity of the liquid

A = area of cross-section

Diameter of the cross-section = d = 2r

Given: m = 18 kg/s, v = 60 m/s,A=?, V = 0.036793 m^3/kg

18 kg/s=\frac{1}{0.036793 m^3/kg}\times A\times 60 m/s

A=0.0110379 m^2

Area of the inner cross section = \pi r^2=\pi \frac{d^2}{4}

\pi \frac{d^2}{4}=0.0110379 m^2

d = 0.1185 m

The inner diameter of the steam tube is 0.1185 m.

5 0
4 years ago
How many moles of oxygen (o) are in a sample of 3.98x10^23 atoms
gregori [183]
1 mol ------- 6,02·10²³ 
X ------------ 3,98·10²³
X = 3,98·10²³/<span>6,02·10²³ 
<u>X= 0,6611</u> moles of oxygen
________________________
:)
</span>
5 0
3 years ago
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