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Anton [14]
3 years ago
15

A 20 g piece of metal with specific heat 0.4 J/g.°C absorbs 3.9 kilojoules of heat,

Chemistry
1 answer:
Ket [755]3 years ago
8 0

Answer:

given that

....the mass of the metal is 20g(0.02kg)

....specific heat capacity(c) is 0.4J/g°C

....ΔT=??

heat(Q)=3.9KJ(3900J)

Q=mcΔT

ΔT= Q/mc

.....=3900÷(20g x 0.4J/g°C)

.....=487.5°C

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What experimental observations indicate a gas is being released?
joja [24]

Answer:

new substances formed, as evidenced by the color changes and bubbles. Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change.

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3 0
3 years ago
Find the value of x in the triangle
myrzilka [38]

Answer:

55.52°

Explanation:

Concept tested: Sine rule of triangles

We need to know the sine rule

  • According to sine rule, if the three sides of a triangle are a, b and c and the corresponding angles, A, B and C
  • Then, \frac{a}{SinA}=\frac{b}{SinB}=\frac{c}{SinC}

In this case;

  • If we take, a = 5.7 units and A = 70°, and

         b= 5 units, B = x°

  • Using the sine rule we can find the value of x

Therefore;

\frac{a}{SinA}=\frac{b}{SinB}

Then;

\frac{5.7}{Sin70}=\frac{5}{Sinx}

6.0658=\frac{5}{sinx}

Sinx=0.8243

Therefore, X = 55.52°

Therefore, the value of x in the triangle is 55.52°

6 0
3 years ago
What is the temperature of 0.80 mol of a gas stored in a 275 mL cylinder at 175 kPa?
vitfil [10]

Answer:

The answer to your question is   T = 7.25 °K  

Explanation:

Data

Temperature = ?

moles = 0.80

volume = 275 ml

pressure = 175 kPa

constant of ideal gases = 0.082 atm l/ mol °K

Process

1.- Use the ideal gas law to solve this problem

                  PV = nRT

-Solve for Temperature

                 T = PV / nR

2.- Convert Pressure to atm

                  1 atm --------------- 101.325 kPa

                    x     --------------- 175 kPa

                    x = (175 x 1) / 101.325

                    x = 1.73 atm

3.- Convert volume to liters

                   1000 ml ---------------- 1 l

                    275 ml ----------------- x

                      x = (275 x 1) / 1000

                      x = 0.275 l

4.- Find the temperature

                   T = (0.275 x 1.73) / (0.8 x 0.082)

-Simplification

                    T = 0.476 / 0.0656

-Result

                     T = 7.25 °K  

5 0
3 years ago
How waves affect matter at the macroscopic and particle levels.
Rus_ich [418]
In a macroscopic object, each particles wave is being absorbed and combined with the waves of the other particles to create one wave for the entire object. Since this object is able to be seen, the wave function immediately collapses.

Anytime you possess anykind of information about the world around us, some wave, somewhere function collapses.

In short, if we can see the object, then it has no wave function.
6 0
3 years ago
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