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Liono4ka [1.6K]
3 years ago
5

Jamal was riding his bike home at a speed of 12 mph. On his trip out, he had traveled 8 miles away from his house. He has been t

raveling for a half hour at this speed.
How far away from home is he?

2
3
4
Chemistry
2 answers:
trapecia [35]3 years ago
4 0
The answer is 2 because if he is going at 12mph that he is going 6mph in 30min. So 8-6=2
Bas_tet [7]3 years ago
3 0

Answer:

2

Explanation:

Speed of Jamal’s bike travelling back home = 12 mph

Time taken by Jamal to travel back home = 0.5 hr

Speed = distance / time  

Distance traveled by Jamal towards his home = speed x time = 12 mph x 0.5 h = 6 miles

Distance traveled by Jamal from his home = 8 miles

On his way back Jamal is 2 miles away from his home.  

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Norma-Jean [14]

Answer:

(we use hess's law) it is so simple but the second reaction is not correct please right it

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3 years ago
A chemistry graduate student is given of a chlorous acid solution. Chlorous acid is a weak acid with . What mass of should the s
DerKrebs [107]

Answer:

11.31g NaClO₂

Explanation:

<em> Is given 250mL of a 1.60M chlorous acid HClO2 solution. Ka is 1.110x10⁻². What mass of NaClO₂ should the student dissolve in the HClO2 solution to turn it into a buffer with pH =1.45? </em>

It is possible to answer this question using Henderson-Hasselbalch equation:

pH = pKa + log₁₀ [A⁻] / [HA]

<em>Where pKa is -log Ka = 1.9547; [A⁻] is the concentration of the conjugate base (NaClO₂), [HA] the concentration of the weak acid</em>

You can change the concentration of the substance if you write the moles of the substances:

[Moles HClO₂] = 250mL = 0.25L×(1.60mol /L) = <em>0.40 moles HClO₂</em>

Replacing in H-H expression, as the pH you want is 1.45:

1.45 = 1.9547 + log₁₀ [Moles NaClO₂] / [0.40 moles HClO₂]

-0.5047 = log₁₀ [Moles NaClO₂] / [0.40 moles HClO₂]

<em>0.3128 = </em>[Moles NaClO₂] / [0.40 moles HClO₂]

0.1251 = Moles NaClO₂

As molar mass of NaClO₂ is 90.44g/mol, mass of 0.1251 moles of NaClO₂ is:

0.1251 moles NaClO₂ ₓ (90.44g / mol) =

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5 0
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Nat2105 [25]
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Katyanochek1 [597]

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<u>Explanation:</u>

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AB+C\rightarrow CB+A

Metal C is more reactive than metal A.

The reactivity of metal is determined by a series known as reactivity series. The metals lying above in the series are more reactive than the metals which lie below in the series.

Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form. This also means that total number of individual atoms on reactant side must be equal to the total number of individual atoms on the product side.

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8 0
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8 0
3 years ago
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