8. Which phrase best describes an atom?(A) a positive nucleus surrounded by a ha dnegative shell(B) a positive nucleus surrounded by a cl udof negative charges(C) a hard sphere with positive particlesuniformly embedded(D) a hard sphere with negative particlesuniformly embedded

Answers

Answer 1

Answer: The best answer is B.... The nucleus is after all positively charged and the shells are a cloud of negatively charged particles that surround the nucleus.

Answer 2

Answer:

An Atom is best described as a positive nucleus surrounded by a cloud of negative charges, with the nucleus containing protons and neutrons, and an outer cloud of electrons.

The phrase that best describes an atom is (B) a positive nucleus surrounded by a cloud of negative charges. An atom consists of two regions: the nucleus, which is centrally located and contains protons and neutrons which are positively charged and neutral respectively; and the electron cloud, which is made up of electrons, that are negatively charged, in constant motion around the nucleus. Therefore, we can visualize the atom as a positive nucleus surrounded by a cloud of negative charges.

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What is the correct way to show carbon dioxide in the gas phase?a. CO (g)
b. CO2 (g)
c. CO2 (s)
d. CO2 (gp)

Answers

The correct way of showing carbon dioxide in the gas phase is b. CO2 (g)

This notation is commonly used in showing chemical reactions wherein the phases of the constituents are important. Gases are denoted by (g), solids are denoted by (s), and liquids are denoted by (l). Aqueous solutions are also denoted (aq).

Solids and liquids have both mass and volume, but a gas has only mass.
a. True
b. False

Answers

True. A gas does not have a definite volume. Therefore, making this statement correct.

Answer:

True. A gas does not have a definite volume. Therefore, making this statement correct.

Explanation:

true

The ingredient label for a fruit drink reads: water, sugar, orange juice, high fructose corn syrup, vitamin C, sodium benzoate (preservative), Red 40, Blue 1.What can you conclude about the fruit drink’s contents?

A) The product contains no preservatives
B) The product contains more juice than water.
C) The product contains more sugar than juice.
D) The product contains more sugar than any other ingredient.

Answers

Answer:

Explanation:

C is the only one that is true. Because sugar comes before juice in the ingredients listed, there is more of it.

What is the main pigement for photosyenthesis inchloroplasts

Answers

I assume the answer is chlorophyll (a or b) but could also be carotenoids.

Answer:

the main pigment is chlorophyll.

Explanation:

It is green

How much of a sample remains after five half-lives have occurred?

Answers

Answer: ${frac{1}{32}$

Explanation:

Half life is the time taken to reduce the original concentration of the reactants to half.

Now, the number of half lives is related to the amount left after decomposition by the formula:

$a=(a_o)/(2^n)$

where,

a = amount of reactant left after n-half lives = ?

$a_o$ = Initial amount of the reactant

n = number of half lives = 5

Putting values in above equation, we get:

$a=(a_0)/(2^5)$

$a=(a_0)/(32)$

Thus the amount of sample that remains after 5 half lives is $(1)/(32)$ of original amount.

It's exponential, every half life will multiply the amount by 1/2. After the first one, 1/2 After the second, 1/4, then 1/8, 1/16, and finally after the fifth will be 1/32.

Which of the following ions has a smaller size? Option 1: O2- Option 2: F- Option 3: They have the same size. Option 4: None of the above.

Answers

The fluoride ion (F-) is smaller in size than the oxide ion (O2-).

The ion with a smaller size is F- (fluoride ion) compared to O2- (oxide ion).

The size of an ion depends on the number of protons and electrons it has. Fluoride ion has one less electron than the oxide ion, making it smaller in size.

This trend can be explained by the concept of effective nuclear charge, where the positive charge of the nucleus is partially shielded by other electrons in the atom. As the atomic number increases from oxygen to fluorine, the increase in nuclear charge outweighs the additional electron-electron repulsions, resulting in a smaller size for fluoride ion.

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