Prior to the World Wide Web, computer users could get information only in the form of

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Answer 1

Answer: Before the World Wide Web, information for computer users was in database forms. Users would travel to the database and access it directly. ChaCha!

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Which of the following is the best example of heat being. Transferred by conduction

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A metal spoon being placed in a boiling pot

The diagram below shows different layers of sedimentary rocks.Picture showing seven layers of rocks of different colors labeled A, B, C, D, E, F, and G from top to bottom; A and B are parallel horizontal layers at the top of the diagram and C, D, E, F, and G are slanted layers with C closest to the surface and G at the bottom.

Based on the diagram, which of these inferences is most likely correct?

A.Layer A is older than Layer B.
B.Layer C is older than Layer E.
C.Layer F is younger than Layer D.
D.Layer B is younger than Layer G.

Answers

Picture showing seven layers of rocks of different colors labeled A, B, C, D, E, F, and G from top to bottom;
A and B are parallel horizontal layers at the top of the diagram;
C, D, E, F, and G are slanted layers with C closest to the surface and G at the bottom.

The inference that is most likely correct is that (C) Layer F is younger than Layer D.

How do you find the name of the chemical formula Pb3N4 (the 3 and 4 are subscripts)

Answers

This is a salt because there is a cation and an anion. Because lead can have multiple charges, its charge must correspond to the charge of the anion. The charge on the N is -3, so the 4 N's equal a total charge of -12. Therefore, the total charge of the 3 Pb's must be 12, so each lead should have a charge of +4. So the name of the compound is Lead (IV) Nitride.

Final answer:

The name of the chemical compound Pb3N4 is Lead (IV) Nitride. The number of atoms of each element in the compound is represented by the subscript numbers, and the '-ide' suffix is used for the non-metal (Nitrogen). The Roman numeral indicates the oxidation state of Lead.

Explanation:

The chemical formula Pb3N4 corresponds to a compound made up of Lead (Pb) and Nitrogen (N). The subscript numbers (3 and 4) denote the number of atoms from each element present in the compound. Considering that Lead is a metal and Nitrogen is a non-metal, we use the '-ide' suffix for the non-metal in the name of the compound. Therefore, the name of Pb3N4 is Lead (IV) Nitride. The Roman numeral (IV) indicates the oxidation state of Lead in the compound.

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When KCl dissolves in water ________. a. the K+ ions are attracted to the partial negative charge on the oxygen atom of the water molecule b. the Cl- ions are attracted to the partial negative charge on the oxygen atom of the water molecule c. the K+ ions are attracted to Cl- ions on the KCl crystal d. the K+ ions are attracted to the partial positive charge on the hydrogen atoms of the water molecule e. the Cl- ions are attracted to dissolved K+ ions

Answers

Answer:

a. the K+ ions are attracted to the partial negative charge on the oxygen atom of the water molecule.

Explanation:

The hydrogen atoms on water are partially positive and the oxygen on water is partially negative.

Since unlike charges attract, the oxygen of the water molecules are attracted to the K+ and the hydrogens are attracted to Cl-. the water surrounds the k+ and cl- so that the unlike charges are allowed to be close together.

The proper response to KCl dissolving in water is e. the Cl- ions are attracted to dissolved K+ ions.

The ionic compound KCl separates into the ions K+ and Cl- when it is introduced to water. The partial negative charges on the oxygen atoms in the water molecules are what draw the positive K+ ions to them. At the same time, the partial positive charges on the hydrogen atoms of the water molecules draw the negative Cl- ions towards them. Ion-dipole interactions are the name for this attraction between ions and water molecules.

In the case of KCl, the dissolved K+ ions in the solution selectively attract the Cl- ions. Due to the polar nature of the individual ions, the water molecules form a hydration shell around them.

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Calculate the energy of the lasers in a Blu-ray player, which emit at a wavelength of 4.05x10−7 m.

Answers

Answer:

4.907 × 10^-19 J

Explanation:

The energy of the lasers in a Blu-ray player can be calculated by using;

E = hf

Where;

E = Energy of laser (J)

h = Planck's constant (6.626 × 10^-34 J/s)

f = frequency (Hz)

However, the frequency must be known first in order to calculate the energy. The frequency can be calculated using the formula:

f = v/λ

Where:

λ = wavelength (4.05x10−7 m.)

v = speed of light (3 × 10^8m/s)

f = frequency (Hz)

f = 3 × 10^8 ÷ 4.05 x 10^−7

f = 0.7407 × 10^(8 + 7)

f = 0.7407 × 10^15

f = 7.407 × 10^14 Hz

Using E = hf

E = 6.626 × 10^-34 × 7.407 × 10^14

E = 49.07 × 10^(-34 + 14)

E = 49.07 × 10^-20

E = 4.907 × 10^-19 J

What is the empirical formula of a compound that is 79.8% carbon and 20.2% hydrogen?

Answers

The empirical formula of the compound containing 79.8% carbon and 20.2% hydrogen is CH₃

Data obtained from the question

Carbon = 79.8%
Hydrogen= 20.2%
Empirical formula =?

How to determine the empirical formula

Divide by their molar mass

C = 79.8 / 12 = 6.65

H = 20.2 / 1 = 20.2

Divide by the smallest

C = 6.65 / 6.65 = 1

H = 20.2 / 6.65 = 3

Thus, the empirical formula of the compound is CH₃

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"Henry mixed salt and water together in a cup until he observed a clear solution. He measured the mass of the solution. Then he placed the cup outside for several sunny days during the summer. After a week, he observed that only solid salt remained in the cup and the mass had decreased. Henry concluded that a physical and chemical change occurred in this investigation."Which statements correctly defend or dispute his conclusion?A.)He is correct. Dissolving salt in water is a physical change, but evaporating the water is a chemical change. Formation of a solid is evidence that a chemical change occurred.B.)He is correct. Evaporation is a physical change, but dissolving salt in water is a chemical change. The change in mass is evidence that a chemical change occurred.C.)He is incorrect. Dissolving salt in water and evaporation of the water are both physical changes. The reappearance of salt is evidence that the change was reversible by a physical change, so it could not be a chemical change.D.)He is incorrect. Dissolving salt in water and evaporation of the water are both chemical changes. The reappearance of salt is evidence that the change was reversible by a chemical change, so it could not be a physical change.