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Crazy boy [7]
3 years ago
11

What characterizes a homogeneous mixture?

Chemistry
1 answer:
Vadim26 [7]3 years ago
4 0
It has the same composition throughout, unlike a heterogeneous which has visibly separate substances
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How much heat is released as the temperature of 25.2 grams of iron is decreased from 72.1°C to 9.8°C? The specific heat of iron
prisoha [69]

Answer:

Q=-697.06\ J

Negative sign says that release of heat.

Explanation:

The expression for the calculation of the heat released or absorbed of a process is shown below as:-

Q=m\times C\times \Delta T

Where,  

\Delta H  is the heat released or absorbed

m is the mass

C is the specific heat capacity

\Delta T  is the temperature change

Thus, given that:-

Mass = 25.2 g

Specific heat = 0.444 J/g°C

\Delta T=9.8-72.1\ ^0C=-62.3\ ^0C

So,  

Q=25.2\times 0.444\times -62.3\ J=-697.06\ J

Negative sign says that release of heat.

8 0
3 years ago
A student heats a liquid on a burner. What happens to the portion of liquid that first begins to warm?
Natalija [7]
I believe it becomes less dense, bc when you heat something it’s molecules spread further apart.
8 0
3 years ago
Read 2 more answers
¿Cuántos electrones conforman un enlace doble?
Aleks04 [339]

Answer:

Cada átomo aporta dos electrones al enlace, es decir, se comparten dos pares de electrones entre dos átomos. Un ejemplo es la molécula de Oxígeno (O2).

Explanation:

6 0
3 years ago
Students find the pH of Substance A to be 2.1 and Substance B to be 4.4. They are told Substance C is less acidic than Substance
Slav-nsk [51]

Answer:

the range should be 2.2 to 4.3

Explanation:

I think so because the numbers at the left side of the scale from 1 are more acidic so as it increases it's still acidic but lesser so 1 is more acidic than 2 so I used 2.2 as the beginning of the range because it's less acidic than A even though its a greater number and 4.3 is lesser than 4.4 but its still greater on the scale. frankly speaking I don't feel so correct because it's in decimal so try and compare facts thank you

8 0
3 years ago
Which of the following best describes what causes the phases of the moon? The alignment of the sun, Earth, and moon The speed of
BlackZzzverrR [31]
The alignments of the planets would be the correct answer.<span />
6 0
3 years ago
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