3 years ago

Explain how mass and energy can be conserved even during a chemical change.

Chemistry

1 answer:

AleksandrR [38]3 years ago

4 0

Mass/ energy can not be created or destroyed

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Help me please, first to answer gets a brainliest!

hoa [83]

Answer:

I think it's commensalism

Explanation:

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The oxidation state of Mn2

kvasek [131]

The oxidation state of Mn2 is 2+

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3 years ago

Determine the amount in grams of KCl that exists in 20.3 g of a solution that contains 1.14 % KCl by mass 1.14 g KCl

Fiesta28 [93]

The mass of KCl that exists in 20.3 g of solution containing 1.14% by mass of KCl is 0.23 g

From the question given above, the following data were obtained:

Mass of solution = 20.3 g

Percentage of KCl = 1.14% = 1.14 / 100 = 0.0114

$Percentage = \frac{mass of solute}{mass of solution} * 100\\\\0.0114 = \frac{mass of KCl}{20.3} \\\\$

Cross multiply

Mass of KCl = 0.0114 × 20.3

Therefore, the mass of KCl in the solution is 0.23 g

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3 years ago

Which of these elements has the smallest atomic radius?

Nadusha1986 [10]

Answer:

F has the smallest

Explanation:

The trend is that atomic radius increases as you move down a group

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3 years ago

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Beta-galactosidase follows Michaelis-Menten kinetics. A 5 micromolar solution of beta-galactosidase catalyzes the formation of 0

jek_recluse [69]

Answer : The beta-galactosidase's $K_{cat}$ is, $160s^{-1}$

Explanation :

Michaelis-Menten formula used :

$V_o=\frac{V_{max}}{K_{cat}}$

where,

$V_o$ = initial concentration = $5\mu mol=5\times 10^{-6}mol$

$V_{max}$ = maximum concentration = $0.8mmol.s^{-1}=0.8\times 10^{-3}mol.s^{-1}$

$K_{cat}$ = Michaelis-Menten constant = ?

Now put all the given values in the above formula, we get:

$5\times 10^{-6}mol=\frac{0.8\times 10^{-3}mol.s^{-1}}{K_{cat}}$

$K_{cat}=160s^{-1}$

Therefore, the beta-galactosidase's $K_{cat}$ is, $160s^{-1}$

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3 years ago