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Ede4ka [16]
3 years ago
10

Write a program that takes three numbers and prints their sum. Every

Advanced Placement (AP)
1 answer:
saveliy_v [14]3 years ago
6 0

Answer:

This solution is implemented in python

num1 = float(input("Number 1: "))

num2 = float(input("Number 2: "))

num3 = float(input("Number 2: "))

print("Sum: "+str(num1+num2+num3))

Explanation:

This line prompts the user for the first number

num1 = float(input("Number 1: "))

This line prompts the user for the second number

num2 = float(input("Number 2: "))

This line prompts the user for the third number

num3 = float(input("Number 2: "))

This calculates and prints the sum

print("Sum: "+str(num1+num2+num3))

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What are some common acids and bases?
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Answer:

1. Acetic acid (CH3COOH): vinegar, acetate.

Acetylsalicylic acid (HOOCC6H4OOCCH3): aspirin.

Ascorbic acid (H2C6H6O6): vitamin C.

Carbonic acid (H2CO3): soft drinks, seltzer water.

Citric acid (C6H8O7): citrus fruits, artificial flavorings.

Hydrochloric acid (HCl): stomach acid.

2. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.

3. In the chemistry, acids and bases have been defined differently by three sets of theories. One is the Arrhenius definition, which revolves around the idea that acids are substances that ionize (break off) in an aqueous solution to produce hydrogen (H+) ions while bases produce hydroxide (OH-) ions in solution.

4. pH < 7.

Sour taste (though you should never use this characteristic to identify an acid in the lab)

Reacts with a metal to form hydrogen gas.

Increases the H+ concentration in water.

Donates H+ ions.

Turns blue litmus indicator red.

5. Bitter taste (opposed to sour taste of acids)

Slimy, or soapy feel on fingers (Slippery)

Many bases react with acids and precipitate salts.

Strong bases may react violently with acids. ...

Bases turn red litmus paper blue.

Bases are substances that contain metal oxides or hydroxides.

6. The salt comes from weathering and volcanic activity. The ocean formed very early on in Earth history, as soon as water comes into contact with rock then weathering processes start – these leach (dissolve) the soluble elements preferentially out of the rock (sodium, calcium, magnesium, potassium etc).

7. <u>Magnesium Sulfate</u>, It is the product of the chemical reaction between magnesium hydroxide and sulfuric acid. In natural medicine, Epsom salts can be used as a laxative. A solution of the salts is used in many homes as a soak for foot aches, bruises and sprains. Some people enjoy using the chemical in their bath water.

8. Salt is white, odorless and it has a salty taste.

All potassium (K), ammonium (NH4+) and sodium (Na) salts are soluble in water (H2O).

Nitrites, nitrates, and bicarbonates can be dissolved in water.

All metallic oxides, metallic carbonates, hydroxides, phosphates, and sulphides are insoluble in water.

9. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water. Water that has more free hydrogen ions is acidic, whereas water that has more free hydroxyl ions is basic. Since pH can be affected by chemicals in the water, pH is an important indicator of water that is changing chemically.

<em>Hope this helps!</em>

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3 years ago
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Gennadij [26K]

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Explanation:

When magma goes through extremely rapid cooling and especially if it did not dissolve enough water into it, it could freeze to glass or the mineral crystals that will be formed will be so small, they will look like glass.

This is because the reactions that occur to create minerals are affected directly by temperature such that if the magma cools down extremely slowly, it will form very large crystals but extremely fast would result in small crystals.

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The correct answer is D
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Answer:

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