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3 years ago

Which of the following is a consequence of humans using fossil fuels?

Chemistry

1 answer:

julia-pushkina [17]3 years ago

4 0

I think it’s A, because all of these are related to fossil fuel somehow.

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Find the "density" of a copper sample whose mass is 134.4 grams and whose volume is 15.0mL

Sonja [21]

Answer:

8.96 g/mL

Explanation:

density = mass / volume

density = 134.3g / 15.0 mL

density = 8.96 g/mL

3 0

3 years ago

What are the concentrations of h3o+ and oh− in tomatoes that have a ph of 4.10?

IRINA_888 [86]

Answer : The concentration of $H_3O^+$ and $OH^-$ are $7.94\times 10^{-5}$ and $1.258\times 10^{-10}$ respectively.

Solution : Given,

pH = 4.10

pH : pH is defined as the negative logarithm of hydronium ion concentration.

Formula used : $pH=-log[H_3O^+]$

First we have to calculate the hydronium ion concentration by using pH formula.

$4.10=-log[H_3O^+]$

$[H_3O^+]=antilog(-4.10)$

$[H_3O^+]=7.94\times 10^{-5}$

Now we have to calculate the pOH.

As we know, $pH+pOH=14$

$4.10+pOH=14$

$pOH=9.9$

Now we have to calculate the hydroxide ion concentration.

$pOH=-log[OH^-]$

$9.9=-log[OH^-]$

$[OH^-]=antilog(-9.9)$

$[OH^-]=1.258\times 10^{-10}$

Therefore, the concentration of $H_3O^+$ and $OH^-$ are $7.94\times 10^{-5}$ and $1.258\times 10^{-10}$ respectively.

5 0

3 years ago

If two objects have the same density, they must have the same

Radda [10]

Answer:

no ,its not necessary tht two objects have same volume have the same mass because the density of the material they are made up of can be different. mass and volume areindependent, two objects with thesame volume can have differentmasses. Therefore, the objects can have different densities.

7 0

3 years ago

Si un electron no consume, ni libera energía el átomo se encuentra:

Sladkaya [172]

Answer:

ni idea lol

Explanation:

4 0

3 years ago

A solution of potassium hydroxide reacts completely with a solution of nitric acid. What solid mixture does it create?

KIM [24]

Answer:

$\boxed{\text{KNO}_{3}}$

Explanation:

The reaction is

KOH(aq) + HNO₃(aq) ⟶ KNO₃(aq) + H₂O(ℓ)

If you evaporate the water, the solid substance is the compound, potassium nitrate.

$\boxed{\textbf{KNO}_{3}}$

KNO₃(aq) ⟶ KNO₃(s)

4 0

3 years ago