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3 years ago

How can the ph scale tell you if a substance is an acid a base or neutral?

1 answer:

3 0

The Ph scale can tell you if a substance is an acid a base or neutral by

a Ph scale runs from a Ph of 1-14. if a substance has a Ph less than 7 (Ph<7) the substance is said to be a an acid

if a substance has a ph greater than 7 (Ph>7) the substance is said to be a base

if a substance has a Ph equal to 7(Ph=7) the substance is said to be neutral

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PLEASEEEEEE answer these 2 questions!! I WILL GIVE BRAINLIEST AND POINTS

Olegator [25]

Answer: B then D

Explanation:

8 0

3 years ago

What is the predicted change in the boiling point of water when 1.50 g of

dezoksy [38]

Answer:

0.00735°C

Explanation:

By seeing the question, we can see the elevation in boiling point with addition of BaCl₂ in water

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$\textsf {While} \: \sf {\Delta T_b} \: \textsf{expression is used} \\ \textsf {for elevation of boiling point}$

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The elevation in boiling point is a phenomenon in which there is increase in boiling point in solution, when the particular type of solute is added to pure solvent.

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$\sf \large \underline{The \: formula \: to \: be \: used \: in \: this \: question \: is} \\ \boxed{T_b = i \times K_b \times m}$

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Where 'i' is van't hoff factor which represents the ratio of observed osmotic pressure and the value to be expected.

and 'i' is 3 (as given in the question)

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'Kb' is molal boiling point constant. And it's value is 0.51°C/mol(given in question)

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'm' represent the molality of solution. Molatity is no. of moles of solution present in 1kg of solution.

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To find molality, we have to divide no. of moles of solute by weight of solution

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While first we need to no. of moles

$\sf \implies no. \: of \: moles = \frac{weight \: of \: solute}{molar \: mass \: of \: solute} \\ \\ \implies \sf no. \: of \: moles = \frac{1.5}{208.23} \\ \\ \sf \implies no. \: of \: moles = 0.0072$

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Now, we will find molality

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$\sf \hookrightarrow molality = \frac{no.\: of \: moles}{weight \: of \: solution} \\ \\ \sf \hookrightarrow molality = \frac{0.072}{1.5} \\ \\ \sf \hookrightarrow molality = 0.048 \: mol {kg}^{ - 1}$

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$\textsf{ \large{ \underline{Now substituting the required values}}}$

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$\sf \longmapsto \Delta T_b = 3 \times 0.51 \times 0.0048 \\ \\ \\ \boxed{ \tt{ \longmapsto \Delta T_b =0.00735{ \degree}C}}$

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Henceforth, the change in boiling point is 0.00735°C.

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1 year ago

Which is not a compound?Electrons spin in shells around the nucleus. The closest shell (n = 1) can contain a maximum of _____ el

melisa1 [442]

The closest shell (n = 1) can contain a maximum of 2 electrons.

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3 years ago

Which of the following increases as you move up a column of the periodic table?

luda_lava [24]

Answer:

electronegativity increases

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2 years ago

How to make non-sticky slime without borax / plz help will mark as brainliest

ddd [48]

In a bowl, combine 1/4 cup of while glue and 1 tablespoon of liquid laundry detergent. Stir to combine, then wait a few minutes for it to turn gooey. If you want to make colored slime, stir in a few drops of food coloring into the glue before you add the detergent.

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3 years ago

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