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almond37 [142]
2 years ago
15

Scientists have categorized trees based on whether they keep or lose their leaves each year. Another logical way to categorize t

rees is based on the
A O types of nutrients needed to grow.
amount of oxygen that is released into the air.
B
c. O color of leaves that are produced.
DO type of fruit that is produced.
Chemistry
1 answer:
Zolol [24]2 years ago
5 0

Answer:

D

Explanation:

I think but it is an better attempt than the other guy answer.

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If the formula for a compound is represented by X3Y2 and the charge on the Y ion is -3, what is the charge in the X ion?
artcher [175]
I cannot fully remember but the charge of a compound always has to be the same.  However, I believe that the sign of the Y2 means that it is positive 2. 

so in my opinion it is in between b and c. use your best judgment. 
3 0
2 years ago
Where in the laboratory is long, unrestrained hair most likely to be a safety concern? near an open flame close to a fume hood n
zimovet [89]

Answer:

near an open flame

Explanation:

if your hair is not tied back near open flames in combination with most hair care products it would turn you into a living torch

7 0
2 years ago
Pls answer I am giving lots of points and need all the work shown. Determine the kb for chloroform when 0.793 moles of solute in
navik [9.2K]

Answer:0.87

Explanation:

8 0
3 years ago
There are three naturally occurring isotopes of the hypothetical element hilarium 45Hi, 46Hi, and 48Hi. The percentages of these
den301095 [7]

Answer:

46.761g/mol

Explanation:

Given parameters:

Element = Hilarium , Hi

Isotopes: Hi- 45, Hi-46 and Hi- 48

Natural abundance of Hi-45 = 18.3%

                                     Hi-46 = 34.5%

                                     Hi-48 = 47.2%

Unknown:

Atomic weight of naturally occurring Hilarium = ?

Solution:

Isotopes have been studied extensively by mass spectrometry. The method is used to determine the proportion/percentage/fraction by which each of the isotopes of an element occurs in nature. The proportion is called geonormal abundance. From this we can calculate the atomic weight of an element.

 We can use the expression below to find this value:

       Atomic weight = m₄₅α₄₅ + m₄₆α₄₆ + m₄₈α₄₈

    m is the atomic mass of each isotope and α is the abundance

Atomic weight = (45 x \frac{18.3}{100} ) + (46 x  \frac{34.5}{100} ) + (48 x  \frac{47.2}{100})

Atomic weight of Hi = 8.235 + 15.870 +  22.656 = 46.761g/mol

6 0
3 years ago
PLEASE HELP!! I need to identify the substance with greatest density and explain why. I’ll give brainliest!!
madam [21]

Answer:

The blue line has the greatest desnsity

Explanation:becuase it has higher mass than any of the other ones

7 0
3 years ago
Read 2 more answers
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