Since the half-life is 4.5 billion years, two half-lives would have elapsed after 9 billion years.
<span>If you start with 400 g, half decays during the first half-life, leaving 200 g. </span>
<span>During the second half-life, half of the 200 g decays, leaving 100 g.</span>
The given statements are radiation, convection and conduction, all warmness are convection while conduction is cold.
<h3>Briefing :</h3>
Your hand touches the burner on the stove. <u>Radiation </u>
Magma in the earth's mantle heats up and rises, then cools and sinks which causes Earth's tectonic plates to move. <u>Convection </u>
You feel the warmth of the sun on a warm summer day. <u>Radiation</u>
The warm water near the equator moves towards the cold water near the earth's poles. This phenomenon is known as a global ocean current. Convection
You accidentally touch the hot part of the iron. <u><em>Radiation </em></u>
The soup on the bottom of a pot heats up by touching the pan. Conduction
Hot soup moves to the top of the pot and cool soup sinks to the bottom. <u><em>Convection</em></u>
Your tongue touches a very cold spoon. <u><em>Conduction </em></u>
The hot pavement heats up the air directly above it. <u>Convection</u>
The warm air over land, moves towards the cooler air over the ocean which causes a windy breeze. <u><em>Convection</em></u>
To know more about earth's mantle :
brainly.com/question/11648219
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Answer:
They are called homogenous mixtures. If you put sand into a glass of water, it is considered to be a mixture. You can always tell a mixture, because each of the substances can be separated from the group in different physical ways. You can always get the sand out of the water by filtering the water away.
Lets make x equal the number times you use the 1/5 ratio alloy and y equal the number of times you use the 3/1 ratio alloy. You can make the equation (x+3y)-(5x+y)=0 and (x+3y)+(5x+y)=350
Then you can make the system of equation of:
-4x+2y=0 (this is y=2x)
6x+4y=350
You can make 6x+8x=350 by through substitution and solve of x.
14x=350
x=25 (which means y=50)
that means that the weight of the 1/5 ratio alloy is 150 pounds.
(25+(5x25))=150
the weight of the 3/1 ratio alloy is 200 pounds.
((50x3)+50)=200
I hope this helps.
<span>Since the oil and water do not mix, some solvent (the ethanol) that is able to dissolve partially in both the oil and the water helps to facilitate the reaction of sodium hydroxide with the fatty acid (to produce the fatty acid salt - soap, and water).</span><span>
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