Which best describes how to classify water?
2 answers:
Answer:
D
Explanation:
Water is a compound and scientifically known as H0 (2 hydrogen atoms and 1 oxygen). Therefore, the answer is...
- Not A because water is not an element of one pure substance; rather, it is a compound and can be broken down into two pure substances.
- Not B because the statement contradicts itself: a compound is made of different atoms and, thus, different molecules.
- Not C because a mixture contains different substances that are physically -- not chemically -- combined. And as we know, water is a compound, which means that its atoms are chemically bonded to one another. Or else it would just be 2 free hydrogen atoms and 1 oxygen.
- D (yay!) because it is not the *most* accurate, but simply the <em>best</em> description of those provided. Water can be described as a homogenous (uniform in appearance) mixture because, minus the "mixture" part, that's what it is, essentially: a substance that looks pure but is really made of up different molecules.
Ngl this was tricky, but I hope this helps :)
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<u>Question</u>:
Which value is being measured in the columns labeled "Fraction remaining” and "Percentage remaining”?
- years of decay
- quantity of energy
- number of stable atoms
- amount of material that has not decayed
<u>Answer</u>:
"Amount of material that has not decayed" being measured in the columns labelled "Fraction remaining” and "Percentage remaining”
<u>Explanation</u>:
The table shown below having explains about the half life , the amount of sample in both fraction and percentage. The first column named half life elapsed tells us the the number of half life that that is completed. Half life is the time taken for an element to reduce or decay into half of its initial amount.
The fraction remaining column gives the amount of sample that is left behind after the half life particular number of half life has completed. similarly the percentage remaining column gives the amount of sample in percentage. For example, the 5th row tells us that after 4 half life is over of the sample remained. In percentage it is 6.25%
