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nignag [31]
2 years ago
11

Laura sees a horse pulling a buggy.

Chemistry
1 answer:
Tcecarenko [31]2 years ago
4 0

Answer:

B

Explanation:

I think that the anserw is B.

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earnstyle [38]

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Explanation:

Causes your tires to lose pressure as the air inside them expands and contracts, triggering the “Check Tire Pressure”

7 0
3 years ago
Can some one help me in this I hope this will be easy for you :)
kramer

Answer:

c) i)  Mg²⁺   ii) O²⁻

Explanation:

I don't know the answer to Q7. because you don't show the diagram

5 0
3 years ago
Which of the following sequences of elements would all have four valence electrons?
Svetradugi [14.3K]

Answer:

Your answer should be B.) C, Si, Ge, Sn! I hope this helps you! :)

5 0
3 years ago
The standard molar enthalpy of formation of NH3(g) is -45.9 kJ/mol. What is the enthalpy change if 9.51 g N2(g) and 1.96 g H2(g)
Vladimir [108]

Answer:

\Delta H=-29.7kJ

Explanation:

Hello!

In this case, since the undergoing chemical reaction is:

N_2+3H_2\rightarrow 2NH_3

We first need to identify the limiting reactant given the masses of nitrogen and hydrogen:

n_{NH_3}^{by\ H_2}=1.96gH_2*\frac{1molH_2}{2.02gH_2}*\frac{2molNH_3}{3molH_2}=0.647molNH_3\\\\  n_{NH_3}^{by\ N_2}=9.51gN_2*\frac{1molN_2}{28.02gN_2}*\frac{2molNH_3}{1molN_2}=0.679molNH_3

It means that only 0.647 moles of ammonia are yielded, so the resulting enthalpy change is:

\Delta H=0.647molNH_3*\frac{-45.9kJ}{1molNH_3}\\\\ \Delta H=-29.7kJ

Best regards!

3 0
3 years ago
Which energy transformation most likely occurs in a steam iron
balu736 [363]
Electrical energy changes to heat energy
3 0
3 years ago
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