CHEMISTRY HIGH SCHOOL

Is the following a chemical change or a physical change? The yolk of an egg, which contains sulfur, causes tarnish to form on silver.

Physical Change

Chemical Change

Answers

Answer 1
Answer: It's a Chemical Change

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COLLEGE

At a certain temperature, the solubility of strontium arsenate, sr3(aso4)2, is 0.0550 g/l. what is the ksp of this salt at this temperature?

Answers

The ksp of the salt is equal to the square of the molar concentration. Converting g/L to to mol/L before plugging into ksp expression. The equation is equal to 1.09 x 10-4 moles. This means there is .0590 grams over 540.8 grams per mole.
HIGH SCHOOL

A solid tablet is dropped into a glass of water. The tablet completely dissolves after a few minutes.

Answers

Dissolving the solid tablet in water is a physical change as the chemical composition of the substance doesn't change.

What is a physical change?

A physical change can be described as a change that occurs when some of the features of the matter change but the identity does not. Physical changes are dived into categories as reversible and irreversible. For example, the melting of ice is a reversible physical change as the melted ice can be refrozen.

Physical change can be described as a kind of change where only the physical properties of a substance such as color, odor, solubility, etc. can undergo change. During physical changes, no chemical bonds between atoms in the substance are broken or formed.

The chemical composition as well as the nature of matter remains unchanged during a physical change.  The molecules of the substance can be rearranged without changing the internal composition.

Dissolving the solid tablet in water can not change the chemical composition of the tablet while the carbon tablet undergoes a chemical reaction with water and produce carbon dioxide.

Learn more about physical change, here:

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Answer:

The moment the tablet starts dissolving a chemical reaction occurs that Some factors can change how quickly the carbon dioxide gas is produced. Stir the ice cubes in the jar for about a minute so that the temperature evens out.

The tablets effervesce, or fizz, when dropped into water. When the solid material has completely disappeared and the bubbles have vaneished. Stir for a minute or two so that it mixes in.

Explanation:

HIGH SCHOOL

For the angular momentum quantum number l=2 , how many possible values are there for the magnetic quantum number (m subscript l)? 1
3
5
8

Answers

Angular momentum quantum number:    

magnetic quantum number:    


The magnetic quantum number         may take values through    .

In this case         is 2, so the magnetic quanum number may take values - 2, - 1, 0, +1 and + 2. That is 5 possible values.

Therefore, the answer is 5.
MIDDLE SCHOOL

how much heat in joules would be required to raise the tempurture of 450g of aluminum from 19.5c to 31.2c

Answers

Answer is 19.5c I think
HIGH SCHOOL

The partially positively charged hydrogen atoms of one water molecule can interact with the partially negatively charged oxygen atoms of another water molecule. This interaction between water molecules is called_______.

Answers

Answer: Hydrogen bonding

Explanation:

HIGH SCHOOL

How much energy must be absorbed by 20.0 grams of water to increase its temperature from 283 c to 303 c in joules. How do you work this out

Answers

Hey there!

ΔH = (20)(2.0)(20°C)
      = 800J
COLLEGE

A 3.0 L container holds a sample of hydrogen gas at 300 K and 100 kPa. If the pressure increases to 300 kPa and the volume remains constant, what will the temperature be? 600 K
900 K
300 K
100 K

Answers

If the pressure  increases  to 300 KPa and  the volume  remain constant  the temperature  will be 
                              900K

it is calculated  using the gays lussac law formula that is P1/T1=P2/T2
P1= 100Kpa
p2=300Kpa
T1=300k
T2=?
by making T2 the subject  of the formula T2 =P2T1/P1

=300KPa x300 k/100 kpa = 900 K


If the pressure increases from initial to 300 kPa and the volume remains constant, 900K will the temperature be.

How we calculate the temperature by using the ideal gas equation?

We can calculate the required pressure by using the ideal gas equation as :

P₁/T₁ = P₂/T₂, where

P₁ = initial pressure of hydrogen gas = 100 kPa

T₁ = initial temperature of hydrogen gas = 300K

P₂ = final pressure of hydrogen gas = 300kPa

T₂ = final temperature of hydrogen gas = ?

In this question volume is constant, now on putting all these values in the above equation we get

T₂ = (300×300) / 100 = 900K

Hence, 900K is the required temperature.

To know more about ideal gas equation, visit the below link:

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COLLEGE

Which statement is incorrect? Select one:

a. The volume of solution in the buret should be recorded when the endpoint is reached.
b. It is good practice to place the flask over a white background to better observe the color change of the solution.
c. The endpoint is when the indicator changes color.
d. Phenolphthalein will go from a colorless solution to a pink solution for the addition of NaOH to an acid solution.
e. When the indicator changes color and remains, 2 more drops of the solution in the buret should be added.

Answers

Answer:

e. When the indicator changes color and remains, 2 more drops of the solution in the buret should be added.

Explanation:

Which statement is incorrect?

Select one:

a. The volume of solution in the buret should be recorded when the endpoint is reached. CORRECT. At the endpoint, the titrant is expected to have completely reacted with the titrand.

b. It is good practice to place the flask over a white background to better observe the color change of the solution.  CORRECT. Using a white background makes it easier to detect the changes in the color of the indicator.

c. The endpoint is when the indicator changes color. CORRECT. This is the function of an indicator.

d. Phenolphthalein will go from a colorless solution to a pink solution for the addition of NaOH to an acid solution.  CORRECT. Phenolphthalein is colorless when pH < 8.3 and it is pink when pH > 10.0.

e. When the indicator changes color and remains, 2 more drops of the solution in the buret should be added. INCORRECT. When the endpoint is reached, no more titrant should be added.

MIDDLE SCHOOL

A permanent magnet can affect: O
A. both permanent magnets and electromagnets.
O B. both non-magnets and electromagnets.
O
c. only permanent magnets.
O
D. only electromagnets and charged particles.
SUBMIT

Answers

Answer: A

both permanent magnet and electromagnets.

i hope that helps

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