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Marianna [84]
3 years ago
11

I need help on science lol

Chemistry
2 answers:
jeyben [28]3 years ago
8 0

Answer: C

Explanation: i think i looked at my notes from 3 months ago when i did this i think C is the best choice let me know after ypu take the test

lara [203]3 years ago
6 0

Answer:

chicken and macaroni

Explanation:

cus

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The volume of a fixed sample of a gas is 150 mL at 25°C , at what temperature will its volume increase to 350 mL ?
Montano1993 [528]

Answer:

it is 52.7

Explanation:

so when it is 30 the degree is 5°

when it is 60, the degree is 10°

when it is 90, the degree is 15° and so on...

6 0
3 years ago
Read 2 more answers
if you are given the number of molecules in an undentified chemical compound, can you calculate the number of moles
krok68 [10]
Divide it by avagardo's constant that should work as its the number of particles. 

8 0
3 years ago
A student dissolves 15.0 g of ammonium chloride(NH4Cl) in 250. 0 g of water in a well-insulated open cup. She then observes the
iren2701 [21]

Answer:  

1) Endothermic.  

2) Q_{rxn}=4435.04J  

3) \Delta _rH=15.8kJ/mol

Explanation:  

Hello there!  

1) In this case, for these calorimetry problems, we can realize that since the temperature decreases the reaction is endothermic because it is absorbing heat from the solution, that is why the temperature goes from 22.00 °C to 16.0°C.  

2) Now, for the total heat released by the reaction, we first need to assume that all of it is released by the solution since it is possible to assume that the calorimeter is perfectly isolated. In such a way, it is also valid to assume that the specific heat of the solution is 4.184 J/(g°C) as it is mostly water, therefore, the heat released by the reaction is:

Q_{rxn}=-(15.0g+250.0g)*4.184\frac{J}{g\°C}(16.0-20.0)\°C\\\\ Q_{rxn}=4435.04J    

3) Finally, since the enthalpy of reaction is calculated by dividing the heat released by the reaction over the moles of the solute, in this case NH4Cl, we proceed as follows:

\Delta _rH=\frac{ Q_{rxn}}{n}\\\\\Delta _rH= \frac{ 4435.04J}{15.0g*\frac{1mol}{53.49g} } *\frac{1kJ}{1000J} \\\\\Delta _rH=15.8kJ/mol

Best regards!  

Best regards!

4 0
3 years ago
What is the lowest value of n that allows g orbital to exit​
xz_007 [3.2K]
Answer:The lowest value of n that allows g orbitals to exist is 5.
5 0
4 years ago
Which substance is a mixture?<br> table salt<br> gasoline<br> aluminum<br> carbon dioxide
GaryK [48]

Answer:

Gasoline

Explanation:

Pure Substance: are those having same type of atoms or molecules.

Compound: one or more atoms of the element combine to form a compound.

Mixture: is combination of one or more substances mix together.

Homogeneous Mixture: are those which are not distinguish by naked eye but can be separated into its components by physical means

Heterogeneous mixture: are those which can be distinguishing by naked eye and can be separated into its components by physical means.

So keeping in mind the above definitions

Table salt:

The chemical formula of table salt is NaCl and it a pure compound not mixture.

Gasoline:  

Gasoline is mixture of hydrocarbon, It contains small hydrocarbons ranging from 4 Carbon to 12 Carbon per molecule. it is a homogeneous mixture.

Aluminum:

Aluminum is a pure substance that is made up of same kind of atoms. so it is an element and not mixture. Its symbol is Al

Carbon dioxide:

Carbon dioxide is a pure compound and its chemical formula is CO₂ and not a mixture.

So, the write option is Gasoline.

6 0
4 years ago
Read 2 more answers
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