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Natali [406]
3 years ago
12

A scientist experiments ima unknown solution. She notices that when a base, sodium hydroxide, is added to the solution, it forms

a salt water. What can she infer from this observation?
(A) the unknown solution has a pH of 2.
(B) the unknown solution is acidic.
(C) the unknown solution contains oxygen.
(D) the unknown solution contains hydroxide ions.
Chemistry
2 answers:
Lelechka [254]3 years ago
8 0
The unknown solution is acidic
irga5000 [103]3 years ago
6 0

Answer:

(B) the unknown solution is acidic.

Explanation:

Hello,

In this case, as the unknown solution reacts with sodium hydroxide forming a salt water, one infers that the unknown solution is acidic since all the acids which react with bases form salts and water based on the shown below widespread chemical reaction:

Acid+Base-->Salt+Water

Which is a neutralization chemical reaction. It is clear that acidic solutions have pH lower than 7 but it is not enough to substantiate the unknown solution formed the salt after the addition of the base. However, the acid could have oxygen but it is not enough to justify the formation of a salt. Finally, it is impossible for the unknown solution to have hydroxide ions since a neutralization was carried out.

Best regards.

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The bonds in the compound MgSO4 can be described asA. ionic, onlyB. covalent, onlyC. both ionic and covalentD. neither ionic nor
Galina-37 [17]
I believe the answer is C. The bonds in the compound magnesium sulfate is ionic and covalent. Magnesium sulfate is soluble in water. When the said compound is dissolved in water, it dissociates into magnesium ions and sulfate ions. However, the bonds that held together the sulfate ions is covalent.
6 0
3 years ago
What is the empirical formula for a compound that is 31.9% potassium, 28.9% chlorine, and 39.2% oxygen?
notsponge [240]
The  empirical formula  for a compound   is KClO3

     Explanation 
 
find  the  moles of each  element
moles  = % composition/molar  mass

molar  mass of  of  potassium =39g/mol ,chlorine = 35.5 g/mol, oxygen =16 g/mol

moles  of potassium  =  31.9 / 39 = 0.818  moles
moles of  chlorine    = 28.9/35.5 = 0.814 moles
moles of   oxygen  =  39.2/  16 =  2.45  moles


find the  mole ratio  by  dividing   with  the smallest  mole = 0.814  moles

potassium = 0.818/0.814  =1  
chlorine  =  0.814/0.814 = 1
oxygen =  2.45 /0.814 =3 


the empirical  formula   is therefore = KClO3
7 0
3 years ago
385 J of heat are needed to heat a piece of aluminum from 22°C to 45°C. If the specific heat of Al is 0.90 J/g°C, what is the ma
VikaD [51]

Answer:

M of Al=33.09g or 0.0331kg

Explanation:

Heat Energy= specific heat*mass*change in temperature

H=M*C*T

make M subject of the formula

M=H/CT

M=685J/0.90J/g°C*(45°C-22°C)

M=685J/0.90J/g°C*23°C

M=685J/20.7J/g

M=33.09g or 0.0331kg

4 0
3 years ago
Which would lower the reaction rate?
saveliy_v [14]

Answer:

D

Explanation: Decreasing the temperature of the system would lower the reaction rate.

4 0
2 years ago
The first chemists, philosophers like, Aristotle were from which country?
qwelly [4]

Answer:

greece

Explanation:

aristole was particularly from stagria, greece. but most early philosophers are from greece

5 0
2 years ago
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