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3 years ago

spaghetti takes about 9 minutes to cook at sea level, but about 14 minutes in the mountains. why do you think this happens???

2 answers:

5 0

This happens because of difference of pressures at sea level and in the mountains. In the mountains pressure has a lower value, so the water used to cook has a lower boiling point and it needs more time to "soften spaghetti up".

Ivahew [28]3 years ago

3 0

Water boils when the vapor pressure of the water equals the atmospheric pressure that's pressing down on it. Water boils at a lower temperature (more easily) at higher elevations (like on mountains), because:

- Atmospheric pressure is lower at higher elevation

- Easier for vapor pressure to equal this lower atmospheric pressure

Since the water boils at a lower temperature, it takes longer for the pasta to cook.

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When 69.9 g heptane is burned it releases __ mol water.

professor190 [17]

Answer:

1) When 69.9 g heptane is burned it releases 5.6 mol water.

2) C₇H₁₆ + 11O₂ → 7CO₂ + 8H₂O.

Explanation:

Firstly, we should balance the equation of heptane combustion.

The balanced equation is: C₇H₁₆ + 11O₂ → 7CO₂ + 8H₂O.

This means that every 1.0 mole of complete combustion of heptane will release 8 moles of H₂O.

We need to calculate the no. of moles in 69.9 g of heptane that is burned using the relation: n = mass/molar mass.

n of 69.9 g of heptane = mass/molar mass = (69.9 g)/(100.21 g/mol) = 0.697 mol ≅ 0.7 mol.

Using cross multiplication:

1.0 mol of heptane releases → 8 moles of water.

0.7 mol of heptane releases → ??? moles of water.

∴ The no. of moles of water that will be released from burning (69.9 g) of water = (0.7 mol)(8.0 mol)/(1.0 mol) = 5.6 mol.

∴ When 69.9 g heptane is burned it releases 5.6 mol water.

5 0

3 years ago

An ecologist counts 75 cardinals in an area measuring 15 square kilometers. What is the population density of the cardinals?

Rom4ik [11]

Answer:

Explanation:

We know that,

number of count of cardinals = 75; and

measured area = 15 square kilometers.

To find the population density of the cardinals in an area of 15 square kilometers, we need to divide the number of cardinals by the given unit area:

Population density of cardinals = 75 / 15 = 5

Therefore, the population density of cardinals in an area measuring 15 square kilometers is 5.

8 0

3 years ago

Read 2 more answers

How many milliliters (mL) are in 0.847 liters (L)

alex41 [277]

Answer:

847 mL

Explanation:

Step 1: Find conversion

1 L = 1000 mL

Step 2: Use Dimensional Analysis

$0.847 \hspace{2} L(\frac{1000 \hspace{2} mL}{1 \hspace{2} L} )$

We see that Liters and Liters cancel out, so we simply multiply.

847 mL

7 0

3 years ago

All acids and alkais are dangerous to us to what extent is that statment true

AveGali [126]

Answer: Most acids and Alkais are dangerous however not all are dangerous.

Explanation:

8 0

3 years ago

Consider the following equilibrium system involving SO2, Cl2, and SO2Cl2 (sulfuryl dichloride): SO2(g) + Cl2(g) ⇌ SO2Cl2(g) Pred

Andrei [34K]

Answer:

(a) forward direction

(b) forward direction

Explanation:

Given , the chemical reaction in equilibrium is,

SO₂(g) + Cl₂(g) ⇄ SO₂Cl₂ (g)

The direction of the reaction by changing the concentration can be determined by Le Chatelier's principle,

It states that ,

When a reaction is at equlibrium , Changing the concentration , pressure, temperature disturbs the equilibrium , and the reaction again tries to attain equilibrium by counteracting the changes.

(a)

For the reaction , Cl₂ is added to the system , i.e. , increasing the concentration of Cl₂ ,Now, according to Le Chatelier , The reaction will move in forward direction , to reduce the increased amount of Cl₂.

Hence, reaction will go in forward direction.

(b)

Removing SO₂Cl₂ from the system ,i.e. , decreasing the concentration of SO₂Cl₂ , according to Le Chatelier , the reaction will move in forward direction , to increase the amount of reduced SO₂Cl₂.

Hence, reaction will go in forward direction.

(c)

Removing SO₂ from the system , i.e. decreasing the concentration of SO₂ , according to Le Chatelier , the reaction will move in backward direction , to increase the amount of reduced SO₂.

Hence, reaction will go in backward direction.

3 0

3 years ago