: suppose you are designing a device to transmit information without wires. What part of the EM spectrum will your device use, and why?
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Does gravity affect your weight???
Giving out 30 pionts PLEASE I NEED HELP RIGHT AWAYYYY!!!!!!!!!!!!!!!!choose the term that best completes each sentence 1.the higher the temperature of something, the greater its _______________2. the change in state from gas to liquid is called_______________3. energy that comes from bonds within matter is called_________________4. the change in state from liquid to gas is called_____________5. gas bubbles forming throughout the liquid is called_______________6. liquid changing to gas only at the surface is called_________________7. the change in state from solid to liquid is called____________8. the change in state from liquid to solid is called____________9. the___________states that during any change, the amount of energy stays the same10. another term for a chemical change is a_____________11. in____________, particles pass directly from solid to gaswords:chemical energythermal energyevaporation melting freezing boiling law of conservation vaporization condensation sublimationchemical reaction
Vivid writing includes ___ descriptions of things that can be seen, touched, heard, smelled, and tasted. A. sensuous B. tangent C. tangible D. vociferous
Jose wandered 4 kilometers at 2 kilometers per hour. How long did Jose wander?
2) gas is heated
4) gas volume changes
5) mass of a gas is increased
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Answer:
2) gas is heated
Explanation:
In this problem, we have a gas in a fixed container (so, the volume of the gas does not change). Let's see what happens in the different situations listed in the question.
1) Gas is cooled. Since the volume if fixed, the work done by the gas is zero: This means that the change in internal energy of the gas is equal to the heat exchanged:
. However, since the gas is cooled, this means that Q is negative (heat is removed from the gas), so
is negative, so the temperature of the gas, T, is decreased. Now if we look at the ideal gas equation
We see that since V, n and R remain constant, a decrease in T corresponds to a decrease in p: so, the pressure of the gas decreases.
2) Gas is heated. If we apply exactly the same reasoning of point 1), we see that when the gas is heated, its temperature increases: therefore, according to the ideal gas equation, its pressure must increase as well.
3) Gas volume change. By looking again at the ideal gas equation:
We see that in this case we don't have enough information to determine how does the gas pressure change. In fact, we don't know whether the volume V increases or decreases, so we cannot determine how p changes.
5) mass of a gas is increased. An increase in the mass of the gas corresponds to an increase in the number of moles, n. However, in the ideal gas equation, we don't know if the temperature of the gas, T, remains the same or not: therefore, we don't have enough information to tell how does p change.
IS IT A MULTI CHOICE?? THEN SAY SO!!!
2 and 5 are the answers
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In open system such as campfire matter can be exchanged between system and surroundings.
What is matter?
Matter in chemistry, is defined as any kind of substance that has mass and occupies space that means it has volume .Matter is composed up of atoms which may or not be of same type.
Atoms are further made up of sub atomic particles which are the protons ,neutrons and the electrons .The matter can exist in various states such as solids, liquids and gases depending on the conditions of temperature and pressure.
The states of matter are inter convertible into each other by changing the parameters of temperature and pressure.In open systems which are not limited by the boundaries exchange of matter can take place between system and surroundings .
Learn more about matter,here:
#SPJ2
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a combination of units ... of THOSE units in fact. Hadn't you noticed ?
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