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ANTONII [103]
3 years ago
7

NEED HELP PLSSS

Chemistry
1 answer:
likoan [24]3 years ago
4 0
Are their answer choices? All Ik is that compound a and b have the same ratio of u to g
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What is the energy change when the temperature of 14.8 grams of solid lead is decreased from 38.4 °C to 23.7 °C ?
zimovet [89]

Answer: Q= -34.6 J

Explanation: Use Q= mc∆T

c for solid lead is equal to 0.159 J/g°C

Substitute the values:

=14.8 g(0.159J/g°C)(23.7°C-38.4 °C)

= 14.8 g(0.159J/g°C) ( -14.7°C)

= -34.6 J

Cancel out the following units: g and °C so the remaining unit is in J.

8 0
3 years ago
A chemist prepares a solution of silver nitrate by measuring out of silver nitrate into a volumetric flask and filling the flask
Snezhnost [94]

Amount of silver nitrate taken = 269.μmol AgNO_{3}

Volume of the solution = 300. mL

Concentration of a solution is generally expressed in terms of molarity. Molarity is defined as the moles of a substance present per liter of the solution.

Molarity = \frac{Moles of solute}{Volume of solution(L)}

We want the concentration in millimoles/L.

Converting μmol to millimol solute:

269.μmol * \frac{1 millimol}{1000 micromol} = 0.269 millimol

Volume from mL to L: 300. mL * \frac{1 L}{1000 mL} = 0.300 L

Therefore concentration of the chemist's solution = \frac{0.269 millimol}{0.300 L} =  0.897 \frac{millimol}{L}

8 0
3 years ago
What is the relationship between chemical and electrical energy
soldi70 [24.7K]

Answer:

Electrochemistry,

Explanation:

Electrochemistry is a branch of chemistry concerned with the relation between electricity and chemical change. Many spontaneously occurring chemical reactions liberate electrical energy, and some of these reactions are used in batteries and fuel cells to produce electric power.

I Hope This Helps!!!!!

4 0
3 years ago
Read 2 more answers
HELP ASAP! WILL GIVE BRAINLY!! Match each of the unknown ions to its appropriate description. 1.B+ 2.A− 3.D^2+ 4.C^2− a.A nonmet
Anon25 [30]

1B.a metal that lost one electron

4C a non metal that gained two electrons

3 0
3 years ago
What impact can wetlands reducing flood do to future generations?
nalin [4]

Answer:

Wetlands prevent flooding by temporarily storing and slowly releasing stormwater. Wetlands also reduce water flow, thus allowing sediments and associated pollutants to settle out. Beneficial microor- ganisms (called biofilm) live on wetland plants and process some forms of pollution.

Explanation:

3 0
2 years ago
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