help please I keep reading about heat in my book and just cant get it.
the amount of heat gained or lost by a substance is equal to the product of its _______ times the change in _______. Within a closed container, the heat lost by one substance must be ______to the heat gained by another substance. A device that makes use of this principle to measure the heat given off in chemical reactions is called _______
heat capacity; temperature ; equal; calorimeter.
Now on the first, the question is poorly worded. Heat given off is equal to the product of mass x specific heat capacity x change in temperature.
Those three things define heat change. In olden days, mass x specific heat content was called heat capacity, it is seldom used that way any more. So Heat change would be heat capacity x change in temperature in those terms.
To understand the concept of heat, you need to know the basic formula and principles involved. The formula you are referring to is the heat transfer equation, which states that the amount of heat gained or lost by a substance is equal to the product of its specific heat capacity times the change in temperature.
1. Specific heat capacity (sometimes called simply specific heat) is a measure of how much heat energy a substance can absorb or release when its temperature changes. Different substances have different specific heat capacities because they require different amounts of energy to change temperature. The unit of specific heat is usually J/g°C (joules per gram per degree Celsius).
2. The change in temperature refers to the difference in temperature between the initial and final states of the substance. It is usually measured in degrees Celsius (or Kelvin, which is an absolute temperature scale).
3. According to the principle of energy conservation, within a closed container or system, the heat lost by one substance must be equal to the heat gained by another substance. This principle is known as the law of conservation of energy or the first law of thermodynamics.
4. The device that makes use of this principle to measure the heat given off in chemical reactions is called a calorimeter. A calorimeter is designed to trap and measure the heat released or absorbed during a chemical reaction.
To summarize, to calculate the amount of heat gained or lost by a substance, you need to know its specific heat capacity and the change in temperature. The heat lost by one substance must equal the heat gained by another substance, as stated by the principle of energy conservation. A calorimeter is the instrument used to measure the heat changes in chemical reactions.