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3 years ago

Describe how species on the Galapagos islands have changed over time

1 answer:

6 0

Five to ten million years ago, the tops of underwater Galapagos volcanoes appeared above water for the first time about 600 km from mainland Ecuador in the middle of the Pacific Ocean. Those volcanic peaks were completely devoid of plant and animal life. All plants and animals that are now native to the islands must have arrived to the islands originally through some form of long-distance dispersal.There are two main ways for species to make their way to remote islands. The first method is by air in the form of flying or being blown by wind, and the second method is by sea while swimming or floating, sometimes with the aid of rafts of tangled vegetation.

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A piece of work can be finished in 30 days 8 hours a day. In how many Days the work would have been finished working 6 hours a d

goblinko [34]

Answer:

If 8 hours= 30 days

then 6 hours= 8×30÷6

= 40 days

Explanation:

7 0

3 years ago

2 SO2(g) + O2(g) + 2 H2O(ℓ) −→ 2 H2SO4(ℓ)

DIA [1.3K]

Answer:

6116g

Explanation:

2SO2(g) + O2(g) + 2H2O(ℓ) −→ 2H2SO4(ℓ)

We want to find the mass in grams of SO2 that is needed to react with 1527 g of O2. First we must convert the grams of O2 to moles of O2 then to moles of SO2 and then to grams of SO2

So first lets find the molar mass of O2

The mass of oxygen according to a periodic table is 15.999

Using this the mass of O2 would be 15.999(2) = 31.988g

Next we need to identify the mole ratio of O2 to SO2

Looking at the equation for 1 mole of O2 there are two moles of SO2

Next we need to find the molar mass of SO2

Again the mass of oxygen is 15.999g and the mass of Sulfur is 32.066

So the mass of SO2 would be 15.999(2) + 32.066 = 64.064g

Now that we have found all the needed conversions :

1 mol O2 = 31.988g

1 mol O2 = 2 mol SO2

1 mol SO2 = 64.064g

We can now use dimensional analysis to calculate the answer.

Kindly check the attached image to see the table. ( sorry if its a bit blurry )
Explanation : The conversions are used to cancel out the units to get to the final unit which is gSO2.

Once the units are cancelled out except for the gSO2 we mutliply and divide based off of what the table says to do.
Here first we divide 1527 by 31.988. We than multiply by 2. Finally we multiply by 64.064 to get the final answer which is 6116gSO2

7 0

2 years ago

How can two liquids be separated?

Leviafan [203]

Answer:

Fractional distillation

Explanation:

A method for separating a liquid from a mixture of two or more liquids. ... This method works because the liquids in the mixture have different boiling points. When the mixture is heated, one liquid evaporates before the other.

3 0

2 years ago

A a black metal measures 2 cm x 3 cm x 2.5 cm if it's much is 67.5 grams calculate its density

liraira [26]

Answer:

d=4.5 g/cm³

Explanation:

v=l x w x h

v=2 x 3 x 2.5

v=15 cm³

d=m/v

d=67.5/15

d=4.5 g/cm³

3 0

2 years ago

A piston contains 5.00 L of gas at a pressure of 101 kPa. The piston is compressed until the gas occupies 2.00 L of space. What

galben [10]

Answer: 252.5 kPa

Explanation:

Given that:

initial volume of gas V1 = 5.00 L

initial pressure of gas P1 = 101 kPa.

new Volume V2 = 2.00 L

new pressure P2 = ?

Since, only pressure and volume are involved, apply the formula for Boyle's law

P1V1 = P2V2

101 kPa x 5.0L = P2 x 2.00L

505 = P2 x 2.00L

P2 = 505/2.00

P2 = 252.5 kPa

Thus, the new pressure of gas inside the piston is 252.5 kPa

4 0

3 years ago