Imagine that you have a metal bar sitting half in the sun and half in the dark. On a sunny day, the part of the metal that has been sitting in the sun feels hot. If you touch the part of the metal bar that has been sitting in the dark, will it feel hot or cold? Justify your answer in terms of thermal conductivity.
Answers
Answer:
It will feel hot.
Explanation:
The part of the metal that has been sitting in the sun will heat up, and because metal is a good conductor, the part sitting in the sun will heat up the part sitting in the dark.
We say metal is a good conductor because it has high thermal conductivity, which mean heat will flow from the hot section of the bar to the cold section of the bat.
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Why do ionic compounds have high melitng points??
Answers
You just need to convert the g into moles using the formula:
moles = mass/molar mass
= 5.6/(39.1+16+1)
= 5.6/56.1
= 0.1 moles
So this makes it 0.1 moles dm^-3
Answers
According to the concept of Avogadro's number, there are 1.505×10²³ molecules in 0.25 mole of O₂.
What is Avogadro's number?
Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number
Number of molecules is obtained by multiplying number of moles and Avogadro's number , that is 0.25×6.023×10²³=1.505×10²³ molecules.
Thus, there are 1.505×10²³ molecules in in 0.25 mole of O₂.
Learn more about Avogadro's number,here:
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0,25 mole O2 ---------------- x molecules
1 . x = 0,25 . 6,02.10²³
x = 1,50.10²³ molecules
2 continents have the most obvious fit of the coastlines.
subject science
Answers
Two continents have the most obvious fit of the coastlines are the east coast of South America and the west coast of Africa.
Further explanation
According to the examination of a world map it reveals a striking match between the shapes of the east coast of South America and the west coast of Africa. Attached the map which shows the west coast of Africa in 1842 and also the map of the east coast of South America. According to the picture of the west coast of Africa in 1842, we can see Sierra Leone and Freetown, where the West India Regiments arrived and departed from.
Two continents have the most obvious fit of the coastlines are the east coast of South America and the west coast of Africa, because the east coast of South America and the west coast of Africa seem to fit together like pieces of a jigsaw puzzle.
Wegener discovered that their rock layers are fit just as it clearly. All the landmasses used to be one great landmass called Pangaea. Due to plate tectonics, fire movements in the mantle of the earth, the continents are slowly through millions of years, spread farther apart.
Learn more
- Learn more about Matching Coastlines brainly.com/question/6285861
Answer details
Grade: 9
Subject: chemistry
Chapter: coastlines
Keywords: coastlines
Answers
Answer: The Sun is present in the center of solar system whose features are color, mass and texture.
Explanation:
Our solar system consists of one star and 8 planets. The star is present in our solar system is the Sun and due to this star only, our solar system is named as such.
The planets present in our solar system are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
These planets revolve around the star which is present at the center of the solar system.
Three physical features of Sun are:
- Color: The color of Sun is yellow.
- Mass: The mass of the Sun is
- Texture: Due to the convectional currents, the texture of the whole surface of sun is granular.
Hence, the Sun is present in the center of solar system whose features are color, mass and texture.
(B) C₂H₂
(C) CH₄
(D) H₂O
(E) C₂H6₆
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......|
H—C—H
..... |
..... H
methane CH4
Answers
The answer should be A, the daughter isotope is the isotope formed from the less stable one (parent)
hope this helps :)