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lukranit [14]
3 years ago
13

A researcher wants to test the solubility (property of being dissolved) of salt in water as the temperature of the water increas

es.
Design an experiment to test his hypothesis that as the water temperature increases the solubility of the salt in water also increases. Include the following in your experimental design: experimental setup, procedure for data collection methods and criteria for evaluating the hypothesis.
Materials: salt, water, beakers, heat source, thermometer, balance
Chemistry
1 answer:
Leya [2.2K]3 years ago
3 0
The researcher may first weight the beaker with water and then start to heat the water to a constant temperature, for example 30 °C and then start adding salt and stirring. He should add salt slowly until solid salt starts to become visible and the solution starts becoming cloudy. When this happens, he should quickly weigh the beaker. The increase in mass is the mass of salt dissolved at that temperature.
The procedure is then repeated but at an increased temperature until 5-6 temperatures have been tested.
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Does anyone have any idea what this means lol
miv72 [106K]

Answer:

29.42 Litres

Explanation:

The general/ideal gas equation is used to solve this question as follows:

PV = nRT

Where;

P = pressure (atm)

V = volume (L)

n = number of moles (mol)

R = gas law constant (0.0821 Latm/molK)

T = temperature (K

According to the information provided in this question;

mass of nitrogen gas (N2) = 25g

Pressure = 0.785 atm

Temperature = 315K

Volume = ?

To calculate the number of moles (n) of N2, we use:

mole = mass/molar mass

Molar mass of N2 = 14(2) = 28g/mol

mole = 25/28

mole = 0.893mol

Using PV = nRT

V = nRT/P

V = (0.893 × 0.0821 × 315) ÷ 0.785

V = 23.09 ÷ 0.785

V = 29.42 Litres

6 0
3 years ago
The highly reactive elements in group 7a are known for forming salts.what are they called
yaroslaw [1]
Group 7A are halogens 

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7 0
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What’s the difference between an ester and an amide
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In amides, the carbonyl carbon is bonded to a nitrogen. The nitrogen in an amide can be bonded either to hydrogens, to carbons, or to both. ... Another way of thinking of an ester is that it is a carbonyl bonded to an alcohol. Thioesters are similar to esters, except a sulfur is in place of the oxygen.

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Nikitich [7]
<h2>question  1</h2>

Mg  + 2HCl→ MgCl2 + H2

after balancing the coefficient for H2   is 1

<em><u>explanation </u></em>

since 1  is in front of H2  it is the coefficient for H2


question  2

 the reaction is single replacement

<u><em>explanation</em></u>

  • because  single replacement  occurs when one element  replaces another.  
  • for  the reaction of  Mg + 2HCl→MgCl2 +H2   Chlorine  

<h2>  Question  3</h2>

The   coefficient  of  H2  is 3

<em><u>explanation</u></em>

  • from  the balanced chemical reaction
  • that is  N2 +3H2 →2NH3  the coefficient  in  front of H2  is   3
<h2 /><h2>  question  4</h2>

N2 + 3H2 → 2NH3  is  a  synthesis  reaction

<u><em>explanation; </em></u>

Synthesis reaction  occurs  when two or more  reactants combine  to form a single product.

  • N2  reacted with  H2  to form   NH3 (ammonia) hence  it is  an example of synthesis reaction.

<h2>question 5</h2>
  1. The sign  that shows that a chemical reaction  has occurred  is    color change, change  in temperature  and  formation of a  gas (bubble)

color change  change in temperature, formation  of  precipitate  and formation  of  a gas(bubble)  is always   an indicator of an occurrence of a chemical  change.

<h2>Question 6</h2>

H2S is not  a strong acid

<u><em>explanation</em></u>

  • strong acid undergo a complete electrolysis  when dissociate in water  for example  HNO3  
  • weak acid  undergo  a partial electrolysis  when dissociate in water   for example  H2S

<h2>question 7</h2>

feels slippery  is not  a property of an acid

<u><em>explanation</em></u>

  • feel  slippery is an example of a  base
  •  The properties of an acid are
  1. sour taste
  2. changes the color of an indicator
  3. usually react with metal among  others
<h2>  Question   8</h2>

detergent with a PH of about  10  is a  <u><em>basic</em></u>

<em><u>explanation</u></em>

  • Base has    a Ph  which range  from 7.1 to  14
  • since  the detergent  has a PH of 10 is a basic
<h2>Question 9</h2>

The balanced chemical equation  for the synthesis  of NaBr is

2Na  + Br2 →2 NaBr

<u><em>explanation</em></u>

 This is because the  equation obey the law of mas  conversation

   for  example it has  2 atoms of  Na   in both reactant and product side

<h2>Question 10</h2>

 reacts with metals  is not  a common  property of  a base

 <u><em>Explanation</em></u>

  • base has  
  1. bitter taste,
  2. feels slippery
  3. turn red litmus paper blue  among others
<h2>  question  11</h2>

Hydrochloric acid have  a PH   in  0-6 range

<u><em>explanation</em></u>

  • HCl  is a strong  acid  
  •  acid has a PH  which are below PH  of 7  hence HCl  has a PH which range from 0-6

<h2>Question 12</h2>

A brand  shampoo  which has a PH between  5 -6 is  a weak  acid

  •    generally acid  has  a PH below   7
  • weak  acid  has a PH of between  5 -6  therefore  brand  shampoo  is a weak  acid
<h2>question 13</h2>

The PH  that indicate  a  solution  of a  base is a PH of 12

 <em><u>Explanation</u></em>

  • base  has a PH  which range between 7-14, hence  a  PH of 12   indicate that it is a  Base
7 0
3 years ago
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