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3 years ago

Which of the following is not true of chemical changes?

Chemistry

2 answers:

elixir [45]3 years ago

8 0

They rarely occur at molecular levels is incorrect, actually they always occur at molecular levels

Katyanochek1 [597]3 years ago

7 0

Answer: Option (a) is the correct answer.

Explanation:

At molecular level there will be need of energy always for breaking or making of chemical bonds. Therefore, a chemical change will always occur at molecular level.

Thus, we can conclude that out of the given options, the statement a chemical change rarely occurs at the molecular level is not true of chemical changes.

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Gekata [30.6K]

Answer:

Its job is to store light

Explanation:

Green plants have the ability to make their own food. They do this through a process called photosynthesis, which uses a green pigment called chlorophyll. ... Chlorophyll's job in a plant is to absorb light—usually sunlight. The energy absorbed from light is transferred to two kinds of energy-storing molecules.

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3 years ago

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Nitrogen has an atomic number of 7; therefore, it has _____ electrons in its outermost electron shell

rosijanka [135]

B.5 as the electronic configuration is 2.5. 2 on the first shell abd 5 on the valency or most outer sgell.

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3 years ago

Explain the difference between atomic mass and atomic number write formula and explain

soldier1979 [14.2K]

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3 years ago

Can you help me solve these using "typical” metric conversions <br> (?/?)(?/?)

mamaluj [8]

Answer:

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Explanation:

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3 years ago

How many molecules of sugar are there in 1 can of soda?

Korvikt [17]

Answer:

$5.8\cdot 10^{22}$

Explanation:

Since no information was provided about the can of soda, let's take an example of 1 can of 12 fl oz (368 g) Coca-Cola.

The nutrition facts state that it contains 33 g of sugar. In order to calculate the number of molecules, we firstly need to know the molecular formula of sugar. Sugar can be represented by $C_{12}H_{22}O_{11}$ .

Our first step is to find the molar mass of sugar:

$M_{C_{12}H_{22}O_{11}} = 342.3 g/mol$

Secondly, dividing mass of sugar, $m = 33 g$ , by the molar mass will yield the number of moles of sugar:

$n_{C_{12}H_{22}O_{11}}=\frac{m}{M}$

Finally, multiplying moles by the Avogadro's constant will yield the number of molecules:

$N_{C_{12}H_{22}O_{11}}=n_{C_{12}H_{22}O_{11}}\cdot N_A =\frac{m}{M} \cdot N_A = \frac{33 g}{342.3 g/mol} \cdot 6.022 \cdot 10^{23} mol^{-1} = 5.8\cdot 10^{22}$

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4 years ago