Answer:
Physical
Explanation:
The change of density alone is a physical change, but there might be some chemical change that results in physical change. For example: Burning a piece of paper will definitely change the density of the paper as some of its content is being changed into smoke which is a gas. So there will be a change in volume which in turn leads to change in density. Therefore, the change of density alone is a physical change, but the change might occur due to another chemical change.
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Answer:
Boron
Explanation:
You can find this by looking at the number of protons in Boron, 5.
Then calculate how many electrons you are given, in this case the 2 core plus the 3 valence equal 5 total electrons
Neutral elements have the same number of protons and electrons, so your answer would be the element with 5 electrons, Boron.
You can also know this by using electron configuration. Since you kow there are 5 electrons then you can use EC to find out where your element is. In this case it is: 1s2 2s2 2p1
Answer:
Explanation:
We are asked to find the pressure of a gas in a can given a change in temperature. We will use Gay-Lussac's Law, which states the pressure of a gas is directly proportional to the temperature. The formula for this law is:
Initially, the gas in the aerosol can has a pressure of 3.10 atmospheres at a temperature of 25 degrees Celsius.
The temperature is increased to 52 degrees Celsius, but the pressure is unknown.
We are solving for the new pressure, so we must isolate the variable 
. It is being divided by 52 degrees Celsius. The inverse operation of division is multiplication, so we multiply both sides of the equation by 52 °C.
The units of degrees Celsius cancel.
The original values of pressure and temperature have 2 and 3 significant figures. Our answer must be rounded to the least number of sig figs, which is 2. For the number we calculated, that is the tenths place. The 4 in the hundredth place tells us to leave the 4 in the tenths place.
The gas pressure in the can at 52 degrees Celsius is approximately <u>6.4 atmospheres.</u>
Answer:
Option C is correct.
The atoms sharing the electron pairs will spread out around the central atom.
Explanation:
In covalent bonding, the atoms involved form a bond by sharing a pair of electrons. These pairs of electrons are repulsive towards one another, when they occur together around a central atom.
Infact, the Valence shell electron pair repulsion (VSEPR) theory explains further that 'electron pairs around a central atom arrange themselves so that they can be as far apart as possible from each other'.
So, it becomes obvious that the atoms that share these electron pairs around a central atom are pushed to spread out as far as possible around that central atom.
Hope this Helps!!!
