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3 years ago

The sediment left behind by a glacier is typically

2 answers:

7 0

The material dropped by a glacier is usually a mixture of particles and rocks of all sizes. This unsorted pile is called glacial till. A moraine is sediment deposited by a glacier. A ground moraine is a thick layer of sediments left behind by a retreating glacier.

Alex787 [66]3 years ago

6 0

Answer:

It's typically a mixture of particles and rocks of all sizes

Explanation:

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Resonance structures are not real. An individual resonance structure does not accurately represent the structure of a molecule o

tatiyna

Answer:

True

Explanation:

Resonance is a concept in chemistry that describes bonding in polyatomic molecules or ions whose structure cannot be efficiently described by a single Lewis structure. Individual resonance structures do not actually exist, that is, they are not real. None of the contributing resonance structures can be said to adequately represent the molecule or ion. However, the hybrid of all the possible resonance structures of the molecule or ion gives a holistic representation of the exact structure of the molecule or ion.

4 0

4 years ago

What color does potassium burn

SIZIF [17.4K]

Potassium burns a violet color

7 0

4 years ago

Read 2 more answers

How many moles are in 15.0 g of copper (ii) sulfate?

galben [10]

The molecular formula for Copper(II) Sulfate is CuSO4. 1 mole is equal to 1 moles Copper(II) Sulfate, or 159.6086 grams.I hope this is right

7 0

4 years ago

If equal masses of aluminum and copper are heated with same amount of heat, which would reach the higher temperature? Explain yo

Anestetic [448]

Answer:

copper will reach to higher temperature first.

Explanation:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

The substances with higher value of specific heat capacity require more heat to raise the temperature by one degree as compared the substances having low value of specific heat capacity.For example,

The specific heat capacity of copper is 0.386 j/g. K and for aluminium is 0.900 j/g.K. So, aluminium take a time to increase its temperature by one degree by absorbing more heat while copper will heat up faster by absorbing less amount of heat.

Consider that both copper and aluminium have same mass of 5g and change in temperature is 15 K. Thus amount of heat thy absorbed to raise the temperature is,

For copper:

Q = m.c. ΔT

Q = 5 g× 0.386 j/g K × 15 K

Q = 28.95 j

For aluminium:

Q = m.c. ΔT

Q = 5 g× 0.900 j/g K × 15 K

Q = 67.5 j

we can observe that aluminium require more heat which is 67.5 j to increase its temperature. So it will reach to higher temperature later as compared to copper.

3 0

4 years ago

PLEASE HELP ME WITH THIS!! DUE IN 2 DAYS!!

Maru [420]

Answer:

1- 1.54 mol.

2- 271.9 kPa.

3- Yes, the tires will burst.

4- 235.67 kPa.

Explanation:

Q1- How many moles of nitrogen gas are in each tire?

To calculate the no. of moles of nitrogen gas in each tire, we can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the nitrogen gas (P = 247.0 kPa/101.325 = 2.44 atm),

V is the volume of the nitrogen gas (V = 15.2 L),

n is the no. of moles of the nitrogen gas (n = ??? mole),

R is the general gas constant (R = 0.082 L.atm/mol.K),

T is the temperature of the nitrogen gas (T = 21°C + 273 = 294 K).

∴ n = PV/RT = (2.44 atm)(15.2 L)/(0.082 L/atm/mol.K)(294.0 K) = 1.54 mol.

Q2: What would the maximum tire pressure be at 50 degrees C?

Now, the temperature is raised to be 50°C (T = 50°C + 273 = 323 K).

The pressure can be calculated using the general gas law: PV = nRT.

∴ P = nRT/V = (1.54 atm)(0.082 L/atm/mol.K)(323.0 K)/(15.2 L) = 2.68 atm = 271.9 kPa.

Q3: Will the tires burst in Moses Lake? Explain.

Yes, the tires will burst because the internal pressure be 271.9 kPa that exceeds 270 kPa, the pressure above which the tires will burst.

Q4: If you must let nitrogen gas out of the tire before you go, to what pressure must you reduce the tires before you start your trip? (Assume no significant change in tire volume.)

To get the pressure that we must begin with:

Firstly, we should calculate the no. of moles at:

T = 55°C + 273 = 328 K,

Pressure = 270 kPa (the pressure above which the tires will burst). (P =270 kPa/101.325 = 2.66 atm).

V = 15.2 L, as there is no significant change in tire volume.

∴ n = PV/RT = (2.66 atm)(15.2 L)/(0.082 L.atm/mol.K)(328 K) = 1.5 mol.

1.5562 moles of N₂ in the tires will give a pressure of 270 kPa at 55°C, so this is the minimum moles of N₂ that will make the tires burst.

Now, we can enter this number of moles into the original starting conditions to tell us what pressure the tires will be at if we start with this number of moles of N₂.

P = ???

V = 15.6 L.

n = 1.5 mol

T = 21°C + 273 = 294.0 K

R = 0.0821 L.atm/mol.K.

∴ P = nRT/V = (1.5 mol x 0.082 x 294.0 K) / (15.6 L) = 2.2325 atm = 235.67 kPa.

So, the starting pressure needs to be 235.67 kPa or just under in order for the tires not to burst.

8 0

3 years ago