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Oliga [24]
3 years ago
7

Which example is NOT a physical change? *

Chemistry
1 answer:
hjlf3 years ago
7 0

Answer:

A

Explanation:

it is no longer going to unripen/ went through a chemical reaction                                                                                

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How friction reduces the efficiency of machines
Oksi-84 [34.3K]

Hello,

Work is done when a force causes an object to move in the same direction that the force is applied..... Friction reduces efficiency because when two surfaces slide past each other, friction resists their motion, and in real machines, some input work is always used to overcome friction.

Hope this helps!!!! Happy Holidays!!!! (:

8 0
3 years ago
A sample of gas in a balloon has an initial temperature of 20. ∘C and a volume of 1.92×103 L . If the temperature changes to 68
morpeh [17]

Answer:

\boxed{2.23 \times 10^{3} \text{ L}}

Explanation:

The pressure is constant, so we can use Charles' Law.

\dfrac{ V_{1} }{T_{1}} = \dfrac{ V_{2} }{T_{2}}

Data:

V₁ = 1.92 × 10³ L; T₁ = 20 °C  

V₂ = ?;                 T₂ = 68 °C

Calculations:

(a) Convert temperatures to kelvins

T₁ = (20 + 273.15) K = 293.15 K

T₂ = (68 + 273.15) K = 341.15 K

(b) Calculate the volume

\dfrac{ 1.92 \times 10^{3}}{293.15} = \dfrac{ V_{2}}{341.15}\\\\6.550 = \dfrac{ V_{2}}{341.15}\\\\V_{2} = 6.550 \times 341.15 = 2.23 \times 10^{3} \text{ L}

The new volume of the gas is \boxed{2.23 \times 10^{3} \text{ L}}.

6 0
3 years ago
Help<br> Me with da joint <br> Freshman shi got me geekin‍♂️
LenKa [72]
Keep trying you will get if you keep trying ok
4 0
3 years ago
What is the basic building block of a nucleic acids?
Leya [2.2K]
Phosphate group , pentose sugar , nitrogen base nucleotide
7 0
4 years ago
Chemical formula of tetraphosphurus octasulfide
Firlakuza [10]

Answer:

Explanation: Does any of this look right? To be honest I just looked it up.

6 0
4 years ago
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