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4 years ago

Last question based on my previous question

Chemistry

1 answer:

nexus9112 [7]4 years ago

6 0

Answer:

Explanation:

1) White tile can be placed underneath the conical flask to make easier spotting the end point of color change.

2) Because it will affect the number of molecules of reactant in the flask.

Acid is added slowly into alkali solution mixed with indicator

The color of indicator changed. So, the mixture has neutralised.

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Leona [35]

The answer is B

To write the equilibrium constant for an equation, all you have to do is divide the products by the reactants. The reactants are always on the left side, and the products are always on the right side. The coefficients of the elements will be written as the exponent of that same element. However, in this equation, we do not have to write any exponents, as there are no coefficient but 1.

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3 years ago

Which pair of compounds are isomers?

juin [17]

CH3OCH3 and C2H5OH are isomers. They have same molecular formula. But with another formation.

4 0

4 years ago

Read 2 more answers

A cube has a mass of 83.021 g and a side length of 7.55cm.

AleksandrR [38]

not understand

Explanation:

hshabaha

7 0

3 years ago

Which describes colloids? Check all that apply.

nirvana33 [79]

Answer:

In chemistry, a colloid is a mixture in which one substance of microscopically dispersed insoluble or soluble particles is suspended throughout another substance. ... Some colloids are translucent because of the Tyndall effect, which is the scattering of light by particles in the colloid.

Credit to: Colloid - Wikipedia

https://en.wikipedia.org › wiki › Colloid

Explanation:

4 0

4 years ago

How many grams of SnO2 are required to produce 1.20x10^21 molecules of water?

Drupady [299]

Answer:

<u>0.150 grams</u>

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Explanation:

The balanced chemical reaction to obtain water from SnO₂ is:

SnO₂ + 2H₂ → Sn + 2H₂O

The mole ratio is:

$\dfrac{1molSnO_2}{2molH_2O}$

Find the number of moles equivalent to 1.20× 10²¹ molecules of water, using Avogadro's number:

$1.20\times 10^{21}molecules\times \dfrac{1mol}{6.022\times 10^{23}molecules}=1.9927\times 10^{-3}moles$

From the mole ratio, the number of moles of SnO₂ are half the number of moles of water. That is:

0.0019927 moles / 2 = 0.00099635 moles of SnO₂

Use the molar mass of SnO₂ to convert the number of moles to grams:

molar mass of SnO₂ = 150.71g/mol

mass of SnO₂ = 0.00099635mol × 150.71 g/mol = 0.150 grams.

The answer must be reported with 3 significant figures.

8 0

3 years ago