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Natalija [7]
3 years ago
5

Pls help with chem test i will give brainliest

Chemistry
2 answers:
SVEN [57.7K]3 years ago
7 0

Answer:

Q-1) 3

Q-2) 2

Q-3) 1

Q-4) 2

Q-5) True

Q-6) True

Explanation:

aev [14]3 years ago
3 0

Answer:

here you go

Explanation:

1=Covalent compound,2=Ionic compounds,3= Ionic Compounds, 5=true

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C.
devlian [24]

Answer:

<u>The final temperature of both substances at thermal equilibrium is 17.3°C</u>

Explanation:

<u>To calculate the final temperature of both substances at thermal equilibrium -:</u>

First , we calculate the heat of A1  cube as follows -

            q= mSΔT

(where q = heat of the cube , m = mass of cube , S= specific heat of cube  {0.902j/g°C}, T = Temperature )

Putting the values given in the question ,

        q= 32.5g\times0.902\j/g°C\times(T_f-45.8°C)

            29.315\times(T_f-45.8)J

Now , calculate the heat of water -

         q=mSΔT

Putting values from the question ,

           q=105.3g\times4.18j/g°C\times (T_f-15.4°C)

              =440.154\times(T_f-15.4)J

          Now ,

Heat lost by water A1= Heat gained by water [negative sign about heat lost]

         -29.315\times(T_f-45.8)J =440.154\times(T_f-15.4)J

            \frac{-(T_f-45.8)J}{T_f-15.4)J} =\frac{440.154}{29.315}=15.0

      -T_f+45.8°C=15T_f-231.2°C

       (45.8+231.2)°C=16T_f

        16T_f=277.03°C

       T_f=\frac{277.03}{16} = 17.3°C

<u>Therefore , the final temperature of both substances at thermal equilibrium is 17.3°C</u>

<u></u>

             

3 0
3 years ago
The element in Group 14, Period 3 on the Periodic Table is classified as a
emmainna [20.7K]
Answer is (3) - metalloid

Elements in group 14 can be classified as non metals, metalloid and metals. Group 14 has C, Si, Ge, Sn and Pb as its elements. C is a non metal. Si and Ge are metalloids while Sn and Pb are metals. 

Metalloids are elements which share both non-metallic and metallic characteristics.

The element in group 14, period 3 on the periodic table is Si. Si is a semiconductor means Si can conduct electricity but not good as metals. Conducting electricity ia one of metallic property. 
5 0
4 years ago
A substance that permits the flow of electrons is a(n <br> a. conductor <br> b. insulator
Rainbow [258]
(A)Conductor permits the flow of electrons.
5 0
4 years ago
Read 2 more answers
Which of the following atoms has six valence electrons? (2 points)
irakobra [83]

The correct answer is Sulfur (S).


Sulfur has 6 valence electrons because it is located in Group 16 (or the sixth group over if you don’t count the transition metals). This means that one atom of sulfur has 6 electrons in its outermost shell out of 8 total “spots”, which you can count by counting the group numbers (excluding the transition metals) from Group 1 (with one valence electron) to Group 18 (the noble gases with full valence or outer shells).


By this same logic, Carbon (C) has 4 valence electrons and Cesium (Cs) has 1 valence electron, so neither of these is the correct answer.


Hope this helps!

4 0
4 years ago
Rings are a characteristic of
Ymorist [56]

Answer:

physical

Explanation:

if it is asking to determine what it is a sign of or how to identify that characteristic it would be a physical.

3 0
3 years ago
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