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kotegsom [21]
3 years ago
5

Hello I need help very bad!!!

Chemistry
1 answer:
Oksanka [162]3 years ago
6 0

D. Cell membrane: surrounds a cell and allows substances to pass in and out

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29. What is E for a system which has the following two steps:
jasenka [17]

Answer:

Zero

Explanation:

Recall that;

E = q + w

Where;

q = heat, w = work done

When heat is absorbed by the system q is positive

When heat is evolved by the system q is negative

When the system does work, w is negative

When work is done on the system w is positive

Step 1

ΔE1= 60 KJ + 40 KJ = 100KJ

Step 2

ΔE2= (-30 KJ) + (-70 KJ) = (-100) KJ

ΔE1 + ΔE2= 100KJ + (-100) KJ = 0KJ

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3 years ago
Calculate the distance that a man walked if it took him 42 seconds to walk at a speed of 3m/s.
Hitman42 [59]

Answer:

126 m

Explanation:

Distance=time*speed➡42*3=126m.

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3 years ago
How do you analyze chemical evidence?
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2. When paleontologists study fossils, which is true of the fossil record that they find?
juin [17]

Answer:

Explanation:

d

7 0
3 years ago
Read 2 more answers
On the space shuttle, lithium hydroxide is produced from lithium oxide and water. The lithium hydroxide then reacts with the exh
Ratling [72]

Answer:

6,2g of CO₂

Explanation:

Based on the reactions:

Li₂O(s) + H₂O(g) → 2LiOH(s)

LiOH(s) + CO₂(g) → LiHCO₃(s)

2,6g of Li₂O and 1,3g of H₂O are:

2,6g × ( 1mol / 29,88g) = 0,087 moles

1.3g × ( 1mol / 18,01g) = 0,072 moles

That means limiting reactant is H₂O. The moles produced of LiOH are:

0,072 moles of H₂O × ( 2mol LiOH / 1mol H₂O) =<em> 0,14 moles of LiOH</em>

Thus, the maximum CO₂ that can react are 0,14 moles of CO₂, in grams

0,14 moles CO₂ × (44,01g / 1mol) = <em>6,2g of CO₂</em>

I hope it helps!

6 0
3 years ago
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