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If a 50 g sample of water is cooled from 30 C to 15 C thereby losing approximately 3140 J of heat what is the change of energy in J?
Wiki User
∙ 13y ago
We know the specific Heat of water is: 4.18J/(g-k)
So the formula is:
q = Cs * m * change in Temperature
In above equation, q = heat, Cs = Specific heat, m = mass
q = 4.18J/(g-K) * 50 * 15 = 3135
But -3135J because this is an exothermic reaction.
Wiki User
∙ 13y ago
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What does a substance do when it is cooled?
It loses energy.
What are two ways to change the state of a substance?
Substances can change state, usually when they are heated or cooled. For example, liquid water turns into steam when it is heated enough, and it turns into ice when it is cooled enough. The closeness, arrangement and motion of the particles in a substance change when it changes state.
When a gas undergoes adiabatic expansion it gets cooled due to?
It gets cooled because the internal energy of the system decreases.
When a liquid is cooled the molecules in that liquid?
I assume you mean what happens to the molecules... They slow down due to the loss of kinetic energy when the liquid is cooled. When they are sufficiently cooled as to cause freezing, that's a different story.
What are the two major characteristics that change when air is heated and cooled?
Since we are talking abut heating and cooling - we define those both as changing the temperature so that is one characteristic. Other characteristics depend on how the heating and cooling occur. If the pressure remains the same, air will expand on heating and contract on cooling. If the volume is held constant, the pressure will increase with heating and decrease with cooling. The internal energy depends on what you do with pressure, work and heat. You can actually get a warmer gas with less internal energy and a cooler gas with more internal energy.
When a pure substance is heated or cooled but does not change state the energy as heat is the what?
chemical change
When a sample of liquid is cooled its thermal energy?
When a sample of liquid is cooled its thermal energy goes to its surroundings
How a change in thermal energy causes matter?
A burning wood fire, when cooled down or extinguished, leaves wood ashes.
What does a substance do when it is cooled?
It loses energy.
What are two ways to change the state of a substance?
Substances can change state, usually when they are heated or cooled. For example, liquid water turns into steam when it is heated enough, and it turns into ice when it is cooled enough. The closeness, arrangement and motion of the particles in a substance change when it changes state.
Why does soil release more energy when cooled?
When something is cool, it tries to absorb energy from it's surroundings. When something is cooled off, it releases energy during that cooling process.
How do i Calculate the change in thermal energy for a 10 piece of copper if it is cooled from 35 C to 21 C.?
You cannot. You need the mass of the piece of copper.
Do particles get smaller or bigger when heated?
When particles are heated or cooled, they do not change size at all. They simply move with greater kinetic energy so the space between particles increases. This prompts the changes in size we see when substances are heated or cooled.
When a gas undergoes adiabatic expansion it gets cooled due to?
It gets cooled because the internal energy of the system decreases.
What are the advantages and disadvantages of an air cooled condensers over that of a fan cooled in refrigeration?
The air cooled can be more efficient because they will use less energy. They are difficult to maintain if it stays too hot.
Which type of energy is harnessed by chloroplasts in plants to produce food?
Light energy, of which mostly comes from the sun - thereby solar energy.
Why are super cooled metals good conductors?
Super cooled metals are good conductors because their super cooled properties allow them to conduct electric currents without resistance. This means no loss of energy.
