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1 year ago

If a glass of water is left in open air for two days, what changes would it undergo in terms of

1 answer:

7 0

Answer: When you leave a glass of water uncovered for 2 days, carbon dioxide in the air starts to mix with it causing the pH to lower, therefore worsening the taste (quality). Also, there will most likely be bacteria and dust floating around in it. Some of the water will eventually evaporate and turn into a gas called water vapor, therefore decreasing the amount of water in the glass (quantity).

Explanation: Hope this helps!

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Complete this equation for the dissociation of the electrolyte NaCl(aq). Omit water from the equation because it is understood t

ella [17]

1. Answer;

Equation;

-NaCl(aq) → Na{+}(aq) + Cl{-}(aq)

Explanation;

-The polar property of water allows ionic compounds such as sodium chloride to dissolve in water. (sodium chloride is an ionic compound).

-Sodium chloride dissociates in water into sodium ions and chloride ions as shown by the equation. Water molecules surrounds the negatively charged chloride ions and positive sodium ions and pulls them away into solution.

2. Answer;

Equation;

Fe(ClO4)3(aq) → Fe 3+(aq) + 3ClO4 - (aq)

Explanation;

Iron (iii) perchlorate (Fe(ClO4)3 dissociates in water into iron (iii) ion and perchlorate ion. Iron (iii) ion is positively charged while the perchlorate ion is negatively charged, they are pulled apart by the polar water molecules, a process called dissociation.

5 0

3 years ago

Read 2 more answers

What type of reaction is shown below? Check all that apply. Ca + 2H2O → Ca(OH)2 + H2 synthesis decomposition combustion single r

Ksju [112]

The balanced reaction is

Ca + 2H2O → Ca(OH)2 + H2

Here this reaction can be compared with

A + BC ---> AB + C

So here one reactant (A) is accepting a group which is being given by another compound (BC) however the A is not giving any group / element or ion

So this single displacement

Similarly in the given reaction

the anion OH- is only being replaced

The element Ca accepts OH- and H2O loses the same group to form new element H2

So the correct answer is

Single replacement also known as single displacement

3 0

2 years ago

Read 2 more answers

How many moles are there in 5.30 x 1024 atoms of silver?

Rus_ich [418]

Answer:

The mass of

4.6

atoms of silver is approximately 820 g.

Explanation:

In order to determine the mass of a given number of atoms of an element, identify the equalities between moles of the element and atoms of the element, and between moles of the element and its molar mass.

mole atoms Ag=6.022xx10

atoms Ag

Molar mass of Ag =#"107.87 g/mol"#

Multiply the given atoms of silver by

mol Ag

6.022

atoms Ag

. Then multiply times the molar mass of silver.

4.6

atoms Ag

mol Ag

6.022

atoms Ag

107.87

g Ag

mol Ag

820 g Ag

6 0

2 years ago

3. Heating by direct contact between particles is called

Yanka [14]

I believe it is “Conduction” im not 100% sure tho, I haven’t done this since the 7th grade.

8 0

3 years ago

Heat is transferred by conduction through a wall of thickness 0.87 m. What is the rate of heat transfer if the walls thermal con

erik [133]

Explanation:

The given data is as follows.

Thickness (dx) = 0.87 m, thermal conductivity (k) = 13 W/m-K

Surface area (A) = 5 $m^{2}$ , $T_{1} = 14^{o}C$

$T_{2} = 93^{o}C$

According to Fourier's law,

Q = $-kA \frac{dT}{dx}$

Hence, putting the given values into the above formula as follows.

Q = $-kA \frac{dT}{dx}$

= $-13 W/m-k \times 5 m^{2} \times \frac{(14 - 93)}{0.87 m}$

= 5902.298 W

Therefore, we can conclude that the rate of heat transfer is 5902.298 W.

4 0

3 years ago