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dexar [7]
3 years ago
14

Matter is never created or destroyed.

Chemistry
1 answer:
kumpel [21]3 years ago
8 0
I believe it is true!
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Can someone help me on number 7
Artist 52 [7]

The answer is "C" because all isotopes have a different mass number. The number of protons does not change. The mass of electrons is negligible. Thus, the number of neutrons changes.

3 0
3 years ago
Which of the following is not considered a base unit according to the SI units of measurement
lakkis [162]
<h2>second</h2>

<h2>hop this may help you</h2>

5 0
3 years ago
Which of the following is a definition of an acid? O a. releases heat when dissolved in water. O b. turns cloudy when dissolved
adell [148]

Answer: Option (d) is the correct answer.

Explanation:

According to Bronsted-Lowry an acid is defined as the specie which is able to donate hydrogen ions when dissolved in water.

For example, HCl \rightarrow H^{+} + Cl^{-}

On the other hand, bases are the species which are able to donate hydroxide ions when dissolved in water.

For example, NaOH \rightarrow Na^{+} + OH^{-}

Thus, we can conclude that a definition of an acid is that it donates H ions when dissolved in water.

4 0
3 years ago
Chrysanthenone is an unsaturated ketone. If Chrysanthenone has M+ = 150 and contains 2 double bond(s) and 2 ring(s); what is its
snow_lady [41]

Answer:

the Molecular formula will be; C10H14O

Explanation:

Given the data in the question;

Chrysanthenone is an unsaturated ketone,

it has M+ = 150 and contains 2 double bond(s) and 2 ring(s).

molecular formula = ?

we know that ketone contain 1 oxygen and mass of oxygen is 16

so mass of the C and H remaining will be;

⇒ 150 - 16 = 134

Now we determine the number of C atoms;

⇒ 134 / 13 = 10

hydrocarbon with 10 hydrogen atom have CnH2n+2 means

⇒ ( 10 × 2 ) +2 = 22 hydrogens

But then we have 3 unsaturation meaning 6 hydrogens less and also we have ring meaning 2 more hydrogens

⇒ 22 - 6 - 2 = 14

Hence the Molecular formula will be; C10H14O

4 0
3 years ago
Can species be considered natural resources?
Firlakuza [10]

Answer:

yes, animals are a natural resources

7 0
3 years ago
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