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SVEN [57.7K]
4 years ago
5

Question 6

Chemistry
1 answer:
Alexxandr [17]4 years ago
7 0

Answer:D

Explanation:

Metals are malleable

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What are the names of the compound (with roman numeral)? Na2SO4
sergiy2304 [10]

Answer:

Sodium sulphate

Or sodium (I) sulphate

Explanation:

7 0
3 years ago
An alum hydrate sample was analyzed by decomposition and gave the following data:
xz_007 [3.2K]

Answer:

No, the experimental result is different from the theoretical value.

Explanation:

Based on the given information, the mass of beaker and watchglass plus alum hydrate is 102.218 grams, and the mass of beaker and watchglass is 101.286 grams. Therefore, the mass of alum hydrate is:  

= 102.218 grams - 101.286 grams

= 0.932 grams

Now the mass of anhydrous compound is,  

= 102.218 grams - 101.798 grams

= 0.42 grams

Thus, the mass of water present is,  

= 0.932 grams - 0.42 grams

= 0.512 grams

The mass percent of water is,  

= mass of water/Total mass of hydrate * 100

= 0.512 grams / 0.932 grams * 100

= 54.93 %

Hence, the experimental result in not similar to the theoretical result.  

7 0
3 years ago
when 27 g of water absorbs 1,5000 joules of heat energy the temperature of the water is raised to 57.7 what is the initial tempe
taurus [48]

Answer:

The initial temperature of the water is -75.08 K.

Explanation:

Given that,

Mass of water, m = 27 g

Heat absorbed, Q = 1,5000 J

Final temperature of water, T₂ = 57.7 K

The specific heat of water is 4.184 J/​g-K

We know that,

Q=mc\Delta T\\\\Q=mc(T_2-T_1)\\\\\dfrac{Q}{mc}=(T_2-T_1)\\\\T_1=T_2-\dfrac{Q}{mc}

Put all the values,

T_1=57.7-\dfrac{15000}{27\times 4.184 }\\\\=-75.08\ K

So, the initial temperature of the water is -75.08 K.

6 0
3 years ago
Which of these statements describes this mathematical equation?
Phoenix [80]
The answer is A.)The final pressure of a gas is directly proportional to volume and temperature change.
3 0
3 years ago
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If the enthalpy change of a reaction in a flask is δh = +67 kj, what can be said about the reaction?
ziro4ka [17]
Answer : Normally in any chemical reaction, if the enthalpy change i.e. ΔH is positive which means it is greater than zero then it can be called as an Endothermic Reaction.

Whereas, the system under study is absorbing heat that is produced during the reaction. So if  ΔH  is found to be positive then it can be called as endothermic reaction.
3 0
4 years ago
Read 2 more answers
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