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Digiron [165]
3 years ago
12

Earth's original atmosphere probably consisted mostly of which gas?

Chemistry
1 answer:
balandron [24]3 years ago
6 0
D-Carbon Dioxide
Hope this helps :)
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If you had a chance to get a scholarship abroad?what would you do?​
Dovator [93]

Answer:

I Would bc it's the better opportunity

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Name two metals alloyed with iron to make stainless steel.
kirill115 [55]
For stainless steel different kinds of compositions are used. Based on that different series of stainless steel has been coined.
1. Series 200 - Iron alloyed with <span>chromium, nickel and manganese.
2. Series 300 - It has 
a. Stainless Steel 304 - it has composition of 18% chromium and 8% Nickel
b. </span>Stainless Steel 316 - This has 18% chromium and 10% Nickel

Each kind of stainless steel is of different cost and has different applications.
7 0
3 years ago
Which element is the excess reagent when 3.00 moles of Mg is ignited in 2.20 moles of pure oxygen
Artyom0805 [142]

Answer:

Oxygen is in excess.

Explanation:

The coefficients of the balanced equation create a mole ratio that shows the ratio of how many reactants are used up and products are created.  

The mole ratio of Mg to O2 in this equation is 2:1, which means that for every two moles of Mg used, there will be 1 mole of O2 used.

If we have 3.00 moles of Mg, we will only need 1.5 moles of oxygen to completely burn the Mg. Therefore, when all 3.00 moles of Mg are used, there will still be some of the 2.20 moles of oxygen remaining.

7 0
2 years ago
5. How do scientists analyze the TRAPPIST system? Write two key ideas. Work with a partner.
pentagon [3]

Answer:

They start with the planet furthest from us then go down the line of how many miles from us it is. Mars and Venus are the closests to us.

Explanation:

Its showing miles away it is and how fast it rotates and scientists study and analyze that.

5 0
3 years ago
For the titration of a weak acid with a strong base what is the pKa of the weak acid if the pH is 6.72 at the equilvalence point
Paladinen [302]

Explanation:

We have to calculate pK_{a} value.

It is known that at the equivalence point concentration of acid is equal to the concentration of anion formed.

Hence,         [HA] = [A^{-}]

Now, relation between pK_{a} and pH is as follows.

                   pH = pK_{a} + log \frac{[A^{-}]}{[HA]}

Putting the values into the above formula as follows.

                   pH = pK_{a} + log \frac{[A^{-}]}{[HA]}

                  4.23 = pK_{a} + log (1)            (as [HA] = [A^{-}])

                   pK_{a} = 4.23                (as log (1) = 0)

or,                   pK_{a} = 4

Thus, we can conclude that pK_{a} of given weak acid is 4.  

                   

6 0
3 years ago
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