The graduate students filled out the necessary applications, and submitted the required references. How is the comma used incorrectly in the sentence above? The comma attempts to separate a compound predicate. The comma attempts to set apart an essential element. The comma attempts to separate a compound subject. The comma attempts to join two independent clauses.

Answers

Answer 1

Answer:

ANSWER: The comma attempts to separate a compound subject.

EXPLANATION: The comma is used in a sentence where a pause is necessary. In this statement, the comma is separating a compound sentence which was unnecessary. The whole sentence is joined by the word 'and' and doesn't need any other word to give a pause in the sentence.

Answer 2

Answer:

The comma is used incorrectly in the sentence above because it attempts to join two independent clauses without a coordinating conjunction.

The sentence "The graduate students filled out the necessary applications" and "submitted the required references" are both independent clauses, each having its own subject and verb. However, the comma is not sufficient to connect these two clauses properly. To correct this, a coordinating conjunction like "and" should be used after the first independent clause, or the comma could be replaced with a semicolon. The current use of the comma creates a comma splice error, which is a common grammatical mistake.

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A sample of matter must be copper if(1) each atom in the sample has 29 protons(2) atoms in the sample react with oxygen
(3) the sample melts at 1768 K
(4) the sample can conduct electricity

Answers

The answer is 1. Copper is an element with sign Cu and atomic number 29 which means that there are 29 protons in this element. It is a soft, flexible, and elastic metal with very extraordinary thermal and electrical conductivity. A newly unprotected exterior of pure copper has a reddish-orange color.

Final answer:

Copper samples must have 29 protons, react with oxygen, melt at 1768 K, and conduct electricity.

Explanation:

In order for a sample of matter to be copper, it must meet certain criteria:

Each atom in the sample must have 29 protons. Copper has an atomic number of 29, which means it has 29 protons in its nucleus.
The atoms in the sample must react with oxygen. Copper undergoes a chemical reaction with oxygen to form copper oxide.
The sample must melt at 1768 K. Copper has a melting point of 1768 K, which is significantly higher than room temperature.
The sample must be able to conduct electricity. Copper is a good conductor of electricity due to its free electrons.

Therefore, if a sample of matter meets all of these criteria, it can be identified as copper.

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State charles's law. If a balloon occupies 885 cm3 volume at 20°C and 794 cm3 at - 10°C , prove that this is according to charles's law.

Answers

find the distance between

the following points:

a) AC0₂0) and B(5, 2)

An aqueous solution has a mass of 490 gramscontaining 8.5 103 gram of calcium ions. The
concentration of calcium ions in this solution is
(1) 4.3 ppm (3) 17 ppm
(2) 8.5 ppm (4) 34 ppm

Answers

One way of expressing concentration is by expressing it by parts per million or ppm. Parts per million is equal to 1 milligram of solute per kilogram of solution. The problem is solved as follows:
ppm = .0085103 mg / .490 kg = 0.017 ppm

What can be added to an atom to cause a nonvalence electron in the atom to temporarily become a valence electron?energy
mass
neutrons
electrons

Answers

Answer:energy

Explanation:

Energy can be added to an atom to cause a non-valence electron in the atom to temporarily become a valence electron. The correct option is A.

What are valence electrons?

Valence electrons are those electrons that are present in the outermost shell of the atom. These electrons are free to form bonds with another atoms.

Non-valence electrons are preset in the inner shell of the element. These shell are fulfilled with electrons, and these electrons does need to form bonds with other atoms to fulfill their orbit.

The electrons in the orbit have different energies present. The energy change when the electrons transfer from one shell to another shell. When energy is given to the electron, they move to the higher orbit or shell.

Thus, the correct option is A, energy.

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A solution containing 1000g of an unknown substance in 12.3g of naphthalene was found to freeze at 1.2∘C. What is the molar mass of the unknown substance?

Answers

Answer: Therefore, the molar mass of the unknown substance is 68.4 g/mol.

Explanation: We can use the freezing point depression equation to solve for the molar mass of the unknown substance:

ΔT = Kf × m

where ΔT is the change in freezing point, Kf is the freezing point depression constant of the solvent (naphthalene), and m is the molality of the solution.

First, we need to calculate the molality of the solution:

molality = moles of solute / mass of solvent (in kg)

We don't know the number of moles of the unknown substance, but we can assume that the naphthalene does not contribute significantly to the total mass of the solution (since its mass is much smaller than the mass of the unknown substance). Therefore, we can use the entire mass of the solution (1000g + 12.3g = 1012.3g) as the mass of solvent.

mass of solute = 1000g

mass of solvent = 12.3g

mass of solution = 1012.3g

molality = (1000g / molar mass) / (12.3g / 1000g) = 81.3 / molar mass

Next, we need to calculate the change in freezing point:

ΔT = 1.2∘C

Finally, we can use the freezing point depression constant of naphthalene to solve for the molar mass of the unknown substance:

Kf for naphthalene = 6.8∘C/m

ΔT = Kf × m

1.2 = 6.8 × (81.3 / molar mass)

molar mass = 68.4 g/mol

Therefore, the molar mass of the unknown substance is 68.4 g/mol.