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2 years ago

9

Name the following straight-chain Alkanes (picture)

1 answer:

Aleksandr-060686 [28]2 years ago

8 0

Answer:

I don't know about the rest but A is heptane

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Where does the energy that causes evaporation come from?

MissTica

Im pretty sure its the sun.

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Scoring scheme: 3-3-2-1 using the ion concentration values in cells #3 & #5 in the expression, ecell#5 - ecell#3 = -(0.0257/

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3 years ago

Which of the following describes a compound? (Hint: Carbon and oxygen both appear on the periodic table.)

Alekssandra [29.7K]

Answer:

A

Explanation:

a compound is a pure substance and A tells that

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2 years ago

Can someone how to do these problems!!

Novosadov [1.4K]

You can use the follwing equations.
pH=14-pOH
pOH=-log[OH⁻]

a) pOH=-log10⁻¹²
pOH=12
pH=14-12
pH=2

You can also use these equations:
[H⁺]=K(w)/[OH⁻] (K(w)=1.01×10⁻¹⁴)
pH=-log[H⁺]

b) [H⁺]=(1.01×10⁻¹⁴)/10⁻²M
[H⁺]=1.01×10⁻¹²M²
pH=-log(1.01×10⁻¹²)
pH=12

You can use either method. It does not really matter.
I hope this helps. Let me know if anything is unclear and when you do the calculations for c you should get pH=7.

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3 years ago

A helium-filled weather balloon has a volume of 793 L at 16.9°C and 759 mmHg. It is released and rises to an altitude of 4.05 km

mariarad [96]

<h3>Answer:</h3>

1082.96 L

<h3>Explanation:</h3>

We are given;

Initial volume of helium gas, V1 = 793 L
Initial temperature, T1 = 16.9°C

But, K = °C + 273.15

Thus, initial temperature, T1 is 290.05 K
Initial pressure, P1 = 759 mmHg
New pressure at 4.05 km, P2 = 537 mmHg
New temperature at 4.05 km, T2 = 7.1 °C

= 280.25 K

Assuming we are required to calculate the new volume at the height of 4.05 km

We are going to use the combined gas law.

According to the combined gas law;

$\frac{P1V1}{T1}=\frac{P2V2}{T2}$

Rearranging the formula;

$V2=\frac{P1V1T2}{P2T1}$

$V2=\frac{(759mmHg)(793L)(280.25K)}{(537mmHg)(290.05K)}$

$V2=1082.96L$

Therefore, the new volume of the balloon at the height of 4.05 km is 1082.96 L

6 0

3 years ago