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Natalka [10]
3 years ago
14

What keeps galaxies togther? How?

Chemistry
1 answer:
aleksklad [387]3 years ago
8 0
Tough question, I would suggest using Google maybe, or just plain out asking your science teacher.
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What anions generally form precipitates? What are the exceptions?
8_murik_8 [283]

Answer:

Carbonates (CO3-2), phosphates (PO4-3) and sulfides (S-2) are insoluble.

The exceptions are the alkali metals and the ammonium ion.

6 0
3 years ago
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An element has two naturally-occurring isotopes. The mass numbers of these isotopes are 113 amu and 115 amu, with natural abunda
DENIUS [597]

Answer: Its average atomic mass is 114.9 amu

Explanation:

Mass of isotope 1 = 113 amu

% abundance of isotope 1 = 5% = \frac{5}{100}=0.05

Mass of isotope 2 = 115 amu

% abundance of isotope 2 = 95% = \frac{95}{100}=0.95

Formula used for average atomic mass of an element :

\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})

A=\sum[(113\times 0.05)+(115\times 0.95)]

A=114.9amu

Thus its average atomic mass is 114.9 amu

5 0
3 years ago
Which are the nutrients essential to us​
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Explanation:

carbohydrate,fat,protein, vitamin, mineral, water

4 0
3 years ago
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Which of the following is a way to manage asthma? *
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Answer:

all of this

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3 0
2 years ago
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4. The mass of a silver liberty (coin) was measured three times and each measurement was made
Vaselesa [24]

Answer:

The average mass of the gold coin reported to five significant figures, even though you  had to divide by "3" to obtain the average.

Explanation:

Given that,

The mass of a silver liberty was measured three times and each measurement was made  to five digits.

The mass values are,

m_{1}=12.519\ g

m_{2}=12.521\ g

m_{3}=12.496\ g

The average mass of the gold  coin is 12.512 g.

We know that,

Significant figures :

Significant figures is explained the nonzero, leading zero and zeros between two nonzero digits.

For example,

The digits is 0.003405

In the digit, 345 = nonzero

0.00 = leading zero

The average mass of the gold coin reported to five significant figures because average mass is 12,512. All digits are nonzero.

Nonzero digit are significant.

Hence, The average mass of the gold coin reported to five significant figures, even though you  had to divide by "3" to obtain the average.

7 0
3 years ago
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