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3 years ago

Which two categories of organic compounds store energy? which of these organic compounds is more common?

1 answer:

5 0

A lipid is an organic compound such as fat or oil. Organisms use lipids to store energy, but lipids have other important roles as well. Lipids consist of repeating units called fatty acids. There are two types of fatty acids: saturated fatty acids andunsaturated fatty acids

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What are some temperature change chemica reaction equations ?

Zinaida [17]

Answer:

The heating and melting of wax

Explanation:

When a candle is burned the wax heats up, but when cooled it hardens and cannot be put back into it original form.

Hope this helps

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7 0

3 years ago

________ properties can be observed only when the substance in a sample of matter are changed into different substances

RUDIKE [14]

I believe it's Chemical properties

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3 years ago

The O2 produced from the decomposition of the 1.0 L sample of H2O2 is collected in a previously evacuated 10.0 L flask at 300. K

Sergio [31]

The full question can be seen below:

$2H_{2}O_2_{(aq)} --> 2H_{2}O_{(l)}+O_{2}_{g}$

The decomposition of $H_{2}O_{aq}$ is represented by the equation above.

A student monitored the decomposition of a 1.0 L sample of $H_{2}O_2_(_{aq}_)$ at a constant temperature of 300K and recorded the concentration of $H_{2}O_2$ as function of time. The results are given in the table below:

Time (s) $H_{2}O_2$

0 2.7

200 2.1

400 1.7

600 1.4

The $O_2_(_{g}_)$ produced from the decomposition of the 1.0 L sample of $H_{2}O_2_(_{aq}_)$ is collected in a previously evacuated 10.0 L flask at 300 K. What is the approximate pressure in the flask after 400 s?

(For estimation purpose, assume that 1.0 mole of gas in 1.0 L exerts a pressure of 24 atm at 300 K).

Answer:

1.2 atm

Explanation:

Considering all assumptions as stated above;

$2H_{2}O_2_{(aq)} --> 2H_{2}O_{(l)}+O_{2}_{g}$

Initial 2.7 mole --- ---

Change -1.0 --- $+\frac{1.0}{2}$

Equilibrium 1.7 mole --- 0.5 mole

To determine the concentration of O₂; we need to convert the moles to concentration for O₂ = $\frac{0.5}{volume in the flask}$

= $\frac{0.5 mol}{10.0 L}$

= 0.05 $\frac{mol}{L}$

Thus, based on the assumption that "1.0 mole of gas in 1.0 L exerts a pressure of 24 atm"

∴ 0.05 $\frac{mol}{L}$ will give rise to = 0.05 $\frac{mol}{L}$ × 24

= 1.2 atm

7 0

3 years ago

When copper metal is heated to 1100 oC it melts. Is this a chemical or physical change? Explain your answer

Pani-rosa [81]

Answer:

it is a physical change

6 0

3 years ago

Read 2 more answers

Identify the state(s) of matter that each property describes.

DIA [1.3K]

Answer:

1) takes the shape of its container ( liquid and gas).

2) fills all available space (gas)

3) maintains its shape ( solid)

4) can be poured ( liquid)

5) is compressible ( gas)

6) has a fixed volume ( liquid and solid)

Explanation:

Matter is simply defined as anything that has weight and occupies space. It exists in three states, namely: solid, liquid and gaseous states.

The properties of different states of matter includes:

SOLID STATE

--> It has a definite shape: The shape of a solid is fixed; it does not depend on the shape of other materials.

--> It has a definite volume: it occupies its own shape due to the force of cohesion among its molecules.

--> It is tightly packed: The molecular movements of particles are negligible.

LIQUID STATE

--> liquid has a defined volume.

--> it has no definite shape: There is no specific shape of a liquid. It occupies any available space. It's shape depends on the shape of the container into which it is poured.

GASEOUS STATE

--> it has no fixed shape: Due to the distance in the molecules of gas, the gaseous state has no shape. It occupies the shape of its container.

--> It has no fixed volume: it occupies the shape of any container that is closed.

--> It is highly compressible: The particles of gas are far off from one another and there is room for collision.

4 0

3 years ago