First and fifth reaction shows endothermic reaction while the rest of it shows exothermic reaction.
<h3>What reaction shows exothermic and endothermic reaction?</h3>
The reaction between ammonium nitrate and water is an example of endothermic reaction because it absorbs heat from the surrounding environment.
Three drops of concentrated sulfuric acid added to 100 milliliters of water in a beaker makes the beaker hot because exothermic reaction occur.
Ammonium chloride dissolved in a beaker of water makes the beaker cold which shows that it is exothermic reaction because heat leaves the solution.
Uranium atoms are split to produce nuclear energy is an example of exothermic reaction.
Water separates into hydrogen and oxygen when an electric current is run through it that shows endothermic reaction.
Methane and oxygen are combined to produce methanol and heat is an example of exothermic reaction.
Learn more about reaction here: brainly.com/question/11231920
#SPJ1
Answer: Theory
It is a theory which is true because it is not a law. A theory by definition is “ a plausible or scientifically acceptable general principle or body of principles offered to explain phenomena.” A law is “a rule defining correct procedure or behaviour in a sport.“ Therefore since this a scientific fact and it is used/ not against the law it is a theory
Explanation:
Answer:
Percentage Yield = 56.9% (to 3 significant figures)
Explanation:
Firstly you need to calculate the amount of moles of Na used. Moles = Mass/Mr, so moles of Na = 1.72x10^-3/23. This gets you 7.47826087x10^-5 moles.
The mole ratio of Na:Na2O is 2:1 so the moles of Na2O will be the moles of Na divided by 2. This gets you 3.739130435x10^-5 moles.
Mass = Moles x Mr
The Mr of Na2O = 62
Mass = 3.739130435x10^-5 x 62 = 2.31826087x10^-3g
Percentage Yield = (Actual Yield / Theoretical Yield) x 100
Percentage Yield = (1.32x10^-3 / 2.31826087x10^-3) x 100
Percentage Yield = 56.93923481%
Percentage Yield = 56.9% (to 3 significant figures)
Answer:
Higher concentration to an area of lower concentration
Explanation:
When you open a perfume bottle at a corner of a room, after a while, its fragrance can be perceived across a distance at the other end of the room. This is because, molecules of the compound in the fragrance have moved from the area of higher concentration in the perfume bottle, across a concentration gradient to a region of lower concentration at the other end of the room. This is diffusion.
