True or false? The radioactive wastes produced by nuclear fission remain dnagerous for dozens of years

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Answer 1

Answer: True, this is why Chernobyl is still not to be lived in

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A speed boat is traveling at 100km/hr. How many hours will it take for the boat to cover a distance of 115km?

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ans) 115/100=1.15 hours

This element has a complete outermost energy level and is found in the 4th period.

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Krypton Krypton has 8 electrons in the outermost energy level. Tip:All elements excluding the Lanthinides and Aninides are in order by molecular structure, kind of. The last column will have a full outermost energy level

David says, "Pure honey has nothing else added." Susan says ,"The honey is not really pure. It is mixture of many subsatnces . Who is right? Explain your answer.

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Really, both David and Susan are right; they were using the term "pure" in different ways. David likely meant "pure honey" in the sense that the honey was not altered or had any additives. Susan used pure as in a "pure substance" in chemistry. Susan is also right, because honey is a medley of carbohydrates, proteins, amino acids, and vitamins and minerals. Chemically, honey is not a pure substance- it's a mixture.

1-Propanol is combusted to provide heat. The equation and the enthalpy change for the process are shown below. C₃H₇OH(l)+4.5O₂( g)→3CO₂( g)+4H₂O(l)ΔH=−2,021 kJ Below is a list of sentences that describe a chemical process. Choose all of the sentences that apply to the above rea Check all that apply. a This process is exothermic. b The enthalpy change for 2C₃H₇OH(l)+9O₂( g)→6CO₂( g)+8H₂O(l) is 2,021 kJ c The enthalpy change for 2C₃H₇OH(l)+9O₂( g)→6CO₂( g)+8H₂O(l) is −4,042 kJ d The enthalpy change for 2C₃H₇OH(l)+9O₂( g)→6CO₂( g)+8H₂O(l) is −2,021 kJ e This chemical process transfers heat from the surroundings to the system. f The enthalpy change for 2C₃H₇OH(l)+9O₂( g)→6CO₂( g)+8H₂O(l) is 4,042 kJ g This process is endothermic. h This chemical process transfers heat from the system to the surroundings.

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Explanation:

Let's analyze the statements one by one:

a) This process is exothermic.

True. The negative enthalpy change (-2,021 kJ) indicates that heat is released during the reaction, making it exothermic.

b) The enthalpy change for 2C₃H₇OH(l)+9O₂(g)→6CO₂(g)+8H₂O(l) is 2,021 kJ.

False. The balanced chemical equation and enthalpy change given are for the combustion of 1 mole of propanol, not 2 moles.

c) The enthalpy change for 2C₃H₇OH(l)+9O₂(g)→6CO₂(g)+8H₂O(l) is -4,042 kJ.

False. This statement suggests a doubled enthalpy change value in the wrong direction. The correct direction is negative (exothermic), but the magnitude is not doubled.

d) The enthalpy change for 2C₃H₇OH(l)+9O₂(g)→6CO₂(g)+8H₂O(l) is -2,021 kJ.

False. This statement suggests the correct direction but doubles the magnitude. The correct magnitude is -2,021 kJ for 1 mole of propanol.

e) This chemical process transfers heat from the surroundings to the system.

False. The process is exothermic, which means it releases heat from the system to the surroundings.

f) The enthalpy change for 2C₃H₇OH(l)+9O₂(g)→6CO₂(g)+8H₂O(l) is 4,042 kJ.

False. This statement suggests the correct magnitude but in the wrong direction. The correct direction is negative (exothermic).

g) This process is endothermic.

False. The process is exothermic, as indicated by the negative enthalpy change.

h) This chemical process transfers heat from the system to the surroundings.

True. An exothermic process like this releases heat from the system to the surroundings.

So, the correct statements are:

a) This process is exothermic.

e) This chemical process transfers heat from the surroundings to the system.

h) This chemical process transfers heat from the system to the surroundings.

What will happen to the volume if the amount of a gas is decreased at constant temperature and pressure?

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To predict the changes, we first that this gas is ideal. An ideal gas i when the molecules of the gas occupy a negligible volume and have no interactions with one another. The conditions of this gas can be calculated by the use of the Ideal Gas equation which is expressed as: PV=nRT. If this gas is at a constant temperature and pressure and the amount is decreased then the volume will most likely decrease as well.

Upwelling is a proccess in which warm, nutrient rich water from the deep ocean rises to the surface. TRUE or FALSE.

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The statement about “Upwelling is a process in which warm, nutrient rich water from the deep ocean rises to the surface” is false. It must be the cold, nutrient rich water from the deep ocean that must rise to the surface and replaces warm surface water. The cause of upwelling is when the local wind patterns blow along the northwest coast of South America causing local surface currents to move away. The warm water is then replaced by the deep cold water

Answer:

false

Explanation:

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