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Sav [38]
2 years ago
12

write a sentence about the evidence for plate tectonics contained in rock layers and global topography.

Chemistry
2 answers:
ollegr [7]2 years ago
3 0

Answer:

they are big chunks of the earth that are constantly vibrating

Explanation:

Ksivusya [100]2 years ago
3 0
Go ask your teacher their your best cheat sheet
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Ammonium nitrate is an ingredient in cold packs used by sports trainers for injured athletes. Calculate the change in temperatur
Ronch [10]

Answer:

See explanation

Explanation:

First, we need to use the correct expression:

Q = m*Cp*ΔT  (1)

Q = n*ΔH  (2)

These are the 2 expressions to calculate heat or energy.

Now, we want to know the change of temperature of the nitrate in water after being added, so with the innitial data of nitrate, we can calculate heat using the second expression. First, we need to calculate moles with the molecular mass:

n = m/MM

n = 42/80.1 = 0.52 moles

With these moles, we can calculate heat with the ΔH of this reaction:

Q = 0.52 * 25.7 = 13.364 kJ or 13,364 J

However, this heat as is being absorbed, the value would be negative.

Now that we have heat, we can use expression (1) and plug these values to solve for ΔT, but before, we need to know the total mass of the solution (water + nitrate)

m = 250 + 42 = 292 g

now, solving for ΔT:

-13,364 = 292 * 4.18 * ΔT

ΔT = -13,363 / (292 * 4.18)

ΔT = -10.95 °C

3 0
3 years ago
How many grams of sodium ions are in na2so4?
LiRa [457]

Answer:

142.04

Explanation:

4 0
3 years ago
A gas occupies a volume of 4.50 L at 44 kPa. What would be the new volume at 50 kPa?
oksano4ka [1.4K]

Explanation:

P1= 44 kpa

P2= 50 kpa

V1= 4.50 L

V2= ?

P1 V1= P2 V2

44 × 4.50 = 50 × V2

198= 50 × V2

V2 = 198/ 50

V2= 3.96 L "the new volume"

5 0
3 years ago
Which electromagnetic wave does the student replace the question mark with in the table?
marysya [2.9K]

Answer:

B) Gamma

Explanation:

Gamma is by far the most powerful, and only one that can produce this much energy

4 0
2 years ago
Read 2 more answers
Mg(ClO2)2 and Al(ClO2)3 contain the same number of atoms
Vladimir [108]
<span>Mg(ClO2)2 has an atom of magnesium, 2 moles of chlorine and 4 moles of oxygen. </span><span>Al(ClO2)3, on the other hand, is composed of one mole of aluminum, one mole of chlorine and six moles of oxygen. The number of molecules of both is equal to 6.022 x10^23 molecules per mole of the compound.</span>
7 0
3 years ago
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