All categories

3 years ago

The indicator methyl red has different molecular structures at high and low pH.

Chemistry

1 answer:

Novosadov [1.4K]3 years ago

6 0

Answer:

a. True

Explanation:

Methyl red is an indicator widely used in quality control of oxides as Zinc oxide in the titration with sulfuric acid.

As is used in titrations of acid-base reactions the indicator change in colour. Is red when the pH < 4.4 (Acidic Solutions) and is yellow when pH > 6.2 (Neutral-Basic solutions).

A change in colour means the structure of the indicator is changing with pH. Thus, the answer is:

You might be interested in

The diagram is a model of one way that materials move into a cell.

Vlad [161]

Answer:

B. The cell membrane surrounds particles outside the cell.

Explanation:

The last step is when the cell membrane completely surrounds particles outside the cell.

This process is often known as endocytosis.

endocytosis is the process whereby a cell ingests materials by engulfing them using the cell membrane.
In this process, the cell membrane completely covers the food.

8 0

3 years ago

Read 2 more answers

the balloon is inflated outdoors on a cold day in North Dakota at a temperature of -35°C to a volume of 3.0 L. The pressure rema

iragen [17]

3.75 litres is the volume of the balloon indoors at a temperature of 25°C.

Explanation:

Data given:

initial temperature of the gas in balloon = -35°C or 238.15 K

initial volume = 3 litres

final temperature = 25 °C or 298.15 K

final volume =?

pressure remains constant

From the data given when pressure is constant Charles' law is applied.

$\frac{V1}{T1}$ = $\frac{V2}{T2}$

Rearranging the equation to know the final volume of the gas in balloon

V2 = $\frac{V1T2}{T1}$

V2 = $\frac{3 X 298.15}{238.15}$

V2 = 3.75 Litres

when the temperature of a gas is increased and pressure remains constant the volume of the gas increases.

7 0

3 years ago

Read 2 more answers

Calculate the mole fraction of the total ions in an aqueous solution prepared by dissolving 0.400 moles of MgBr2 in 850.0 g of w

diamong [38]

<span>moles water = 850.0 g / 18.02 g/mol=47.2
moles Mg2+ = 0.400
moles Cl- = 2 x 0.400 = 0.800
moles ions = 0.400 + 0.800= 1.2
mole fraction ions = 1.2 / 1.2 + 47.2 =0.0248</span>

7 0

3 years ago

Read 2 more answers

Question 10 How many oxygen atoms are in the chemical formula Al(PO4)3? O 1 O 12 O 3

Basile [38]

13 atoms are in the chemical formula AI(PO4)3
hope that helps :-)

5 0

3 years ago

Read 2 more answers

Draw the Lewis structure for the polyatomic amide anion(NH2-). Be sure to include all resonance structures that satisfy the octe

Grace [21]

Answer:

Following are the solution to this question:

Explanation:

Following are the lewis structure of the $NH_2^{-}$ :

In the given element two H and one N are used, in which N has 5 valance electrons, and one H has 1 valence which is equal to 2 electrons valance. So, the graph for the given element is defined in the attached file.

3 0

3 years ago