Why does a closed system mean that nothing could enter or exit
Solution 1
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Answer:
The answer is d
Explanation:
Potassium and iodine forms K+ and I- when potassium and iodine react to form the ionic compound potassium iodide .
What do you mean by the ionic compound ?
Ionic compounds are pure substances formed from chemically bonded ions. Ionic bonds form ionic compounds.
Ionic compounds are electrically neutral . They are held together by electrostatic forces of attraction .
Properties of ionic compound are -:
- Ionic Compounds have high boiling and melting points .
- The electrostatic forces of attraction between oppositely charged ions lead to the formation of ions.
- Ionic compounds form crystals.
- These compounds are brittle and break into small pieces easily.
Hence , potassium and iodine forms K+ and I- when potassium and iodine react to form the ionic compound potassium iodide .
Learn more about ionic compounds ,here:
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He then asked the students if the jar was full. They agreed that it was.
So the professor then picked up a box of pebbles and poured them into the jar. He shook the jar lightly. The pebbles, of course, rolled into the open areas between the rocks.
He then asked the students again if the jar was full. They agreed it was.
The professor picked up a box of sand and poured it into the jar. Of course, the sand filled up the remaining open areas of the jar.
He then asked once more if the jar was full. The students responded with a unanimous “Yes.”
“Now,” said the professor, “I want you to recognize that this jar represents your life. The rocks are the important things – your family, your partner, your health, your children – things that if everything else was lost and only they remained, your life would still be full. The pebbles are the other things that matter – like your job, your house, your car. The sand is everything else, the small stuff.”
“If you put the sand into the jar first,” he continued, “there is no room for the pebbles or the rocks. The same goes for your life. If you spend all your time and energy on the small stuff, you will never have room for the things that are important to you. Pay attention to the things that are critical to your happiness. Play with your children. Take your partner out dancing. There will always be time to go to work, clean the house, give a dinner party, or fix the disposal.”
“Take care of the rocks first – the things that really matter. Set your priorities. The rest is just sand.”