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Drupady [299]
3 years ago
13

What is the advantage of having valves in the

Chemistry
1 answer:
fenix001 [56]3 years ago
6 0
The valves stop the blood from flowing backwards
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If a bar of motilium cost .0.2 dollars how much will 200 bars cost
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Answer: 40

Explanation: 0.2 x 200

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A scientist observed a 5-mL sample of an unknown substance. It is a blue liquid with a density of 1.2 g/cm. the substance reacts
LenaWriter [7]
Characteristic properties can be used to describe and identify the substances, while non-characteristic properties, although can be used to describe the substances, cannot be used to identify them.

Temperature, mass, color, shape and volume are examples of non-characteristic properties.

Density, boiling point, melting point, chemical reactivity are examples of characteristic properties.

List of the properties observed by the scientist:
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Property                                     Type of property
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Volume: 5 ml                              non-characteristic
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Color: blue                                 non-characteristic
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State: liquid                                characteristic
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density: 1.2 g/cm                        characteristic
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Reaction: reacts with CO2         characteristic
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What is the steps of <br> Photosynthesis?
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Answer:

First the chlorophyll (the chemical that makes plants leaves green and traps sunlight)...

Next the sunlight gives the plant energy to start the food-making process.

Then the roots suck nutrients up to the leaves and then the leaves mix carbon dioxide,...

Finally they throw out their waste (oxygen).

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Which activity best demonstrates Ernest Rutherford’s creativity?
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Answer is: B. designing an experiment to test the plum pudding model.

Rutherford demonstrate that J.J Thompson's Plum Pudding model was not accurate, but before testing, he thought that plum pudding model is correct.

Rutherford theorized that atoms have their charge concentrated in a very small nucleus.

This was famous Rutherford's Gold Foil Experiment: he bombarded thin foil of gold with positive alpha particles (helium atom particles, consist of two protons and two neutrons).  

Rutherford observed the deflection of alpha particles on the photographic film and notice that most of alpha particles passed straight through foil.

That is different from Plum Pudding model, because it shows that most of the atom is empty space.

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Which type of molecule is shown below?<br> O A. Alkane<br> B. Alkyne<br> C. Aromatic<br> D. Alkene
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Answer:

alkyne molecules is shown

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