Explanation:
A column on the periodic table represents a period.
These are some of the variations observed across a period;
- Atomic radii decreases progressively from left to right due to the progressive increase in the nuclear charge without an attendant increase in the number of electronic shells.
- Ionization energy increases progressively from left to right due to decreasing atomic radii.
- Electronegativity increases from left to right.
- Electropositivity decreases across a period.
<u>Answer:</u> The temperature when the volume and pressure has changed is 274 K
<u>Explanation:</u>
To calculate the pressure when temperature and volume has changed, we use the equation given by combined gas law. The equation follows:
where,
are the initial pressure, volume and temperature of the gas
are the final pressure, volume and temperature of the gas
We are given:
Putting values in above equation, we get:
Hence, the temperature when the volume and pressure has changed is 274 K
Answer:
Viruses could have a high mutation rate
Explanation:
Viruses replicate very fast when they enter into the bloodstream. This isn’t however the real cause of why a secondary immune system isn’t possible against them.
The main cause is because they mutate rapidly. The immune system already has an idea of the genetic composition of the pathogen exposed to previously and knows how to fight it. But the viruses undergoes some genetic alterations which then makes it hard for the secondary immune response to attack and kill them.
Answer:As heat for making hot water, heating buildings and cooking.
To generate electricity with solar cells or heat engines.
To take the salt away from sea water.
To use sun rays for drying clothes and towels.
It is used by plants for the process of photosynthesis.
Explanation: