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3 years ago

How to find an experimental error

1 answer:

6 0

Divide the difference by the accepted value and Multiply times 100 to make the value a percent. Use significant figures in all your calculations. When you subtract (Step #1) round your answer to the correct number of significant figures.

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How kids today make slime and why each ingredient is used. What does each ingredient do and what happens if you change how much

Igoryamba

Answer:

Find the steps and explanation below.

Explanation:

A. Kids make slime following these basic steps;

1. In a bowl, is 1/4 cup of water is added to 1 oz. of glue. Add coloring if you wish to.

2. 1/4 cup of Borax solution, also known as Sodium Tetraborate is added to the mixture and gradually stirred.

3. The mixture is kneaded with the hands to ensure a smooth consistency.

4. Water remnants are discarded and the slime is stored in a plastic bag and kept in the fridge.

What each ingredient does

Polyvinyl acetate present in the glue acts as a liquid polymer.

Borax binds the liquid polymers together.

Water eases the mixing process

If lesser ingredients are used, the slime will not have its characteristic slimy nature. If excess of the ingredients are used, the slime becomes very sticky.

4 0

3 years ago

Suppose you want to prepare a buffer with a pH of 4.59 using formic acid. What ratio of [sodium formate]/[formic acid) do you ne

katrin [286]

Answer:

7.08

Explanation:

To solve this problem we'll use the Henderson-Hasselbach equation:

pH = pka + log $\frac{[A^-]}{[HA]}$

Where $\frac{[A^-]}{[HA]}$ is the ratio of [sodium formate]/[formic acid] and pka is equal to -log(Ka), meaning that:

pka = -log (1.8x10⁻⁴) = 3.74

We input the data:

4.59 = 3.74 + log $\frac{[A^-]}{[HA]}$

And solve for $\frac{[A^-]}{[HA]}$ :

0.85 = log $\frac{[A^-]}{[HA]}$

$10^{(0.85)}$ = $\frac{[A^-]}{[HA]}$

$\frac{[A^-]}{[HA]}$ = 7.08

3 0

3 years ago

Quick Chemistry question, please show work :) 3. If 25.0 mL of a 4.525 M solution of HCl was poured into 112.0 mL of distilled w

fomenos

The total mole number of solutes will not change. So it is 25 * 10^-3 *4.525 mole. And the final volume is 25+112 = 137 mL. So the resulting concentration is mole number / volume=0.8257 M.

7 0

3 years ago

What do cuticles do for land plants that was not necessary for ancestors that lived in water?

Vera_Pavlovna [14]

Answer:

What do cuticles do for land plants that was not necessary for ancestors that lived in water? Cuticles help prevent water loss. ... The next groups of land plants to evolve were ferns, which could grow bigger and taller because they could transport water and food.

Explanation:

8 0

3 years ago

Suppose you decide to define your own temperature scale using the freezing point (13 degrees C) and boiling point (360 degrees C

podryga [215]

M.P of oleic acid = 13 deg C
B.Pof oleic acid = 360 deg C 

(360 - 13) / 100 = 3.47 
So 1 deg O = 3.47 deg C 

The scale do not start at 0 deg C, it starts at 13 deg C. So to convert deg C to deg O,
subtract 13 then divide by 3.47 

deg O = (deg C - 13) / 3.47 

convert O to C multiply by 3.47 then add 13 

deg C = (deg O x 3.47) + 13 

convert 0 deg C to deg O 
deg O = (0 deg C - 13) / 3.47 
= - 3.75 deg O

8 0

3 years ago