1. Which of the following statements about the properties of elements related to an
atomic emission spectrum are true? Select all that apply. (3 are correct)

Answer:

15 millimeters

Explanation:

the other answer choices are too large.

Answer:

15 millimeters

Explanation:

The other options are too long.

Answer:The octet rule

Explanation:that there is eight electrons in the valence shell to make it stable.

Explanation:

atom with greater stability have less energy, so a reaction that the stability of the atom will release in the form of heat or light.

Answer:

B

Explanation:

Answer:

I feel it's an extremely underrated Ice cream flavor!

Explanation:

Answer:

it's pretty good

Explanation:

Answer:

160.3 g S

Explanation: there you go

Answer:

group 3 and 12 alkali and alkaline earth metal

A wave with a smaller wavelength has UV radiation energy than one with a larger wavelength.

Uses of UV Rays

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Newton’s second law of motion is a dot product of mass and acceleration, if you remove the table from, under the book, gravity will act on the book and pull it downwards to the centre of the earth

Newton's Second law of motion states that "the acceleration of an object depends upon two variables – the net force acting on the object and the mass of the object."

In our case the mass of the book and the force of gravity

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Answer:

Moles of oxygen needed to burn given amount of octane is 16.875 moles.

Explanation:

The statement is a false.

An acid is a substance which when dissolved in water, produces hydroxonium ion, as the only positive ion.

Some properties of acid include:

There are two types of acids which includes:

Examples of weak acid is acetic acid and tartaric acid.

They can be used as food substances like vinegar and naturally occurs on fruit like banana or grape.

Therefore, weak acids such as acetic acid and tartaric acid can be tasted.

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The given statement is False.

Some acids like acetic acid and tartaric acid can be tasted.

Organic acids, such as acetic, citric, malic, and fumaric acids in fruits and vegetables, and tartaric acid in wine, contribute significantly to the sour flavor of foods and beverages. Many inorganic acids taste sour in dilute solutions.

Tartaric acid is fairly water soluble and has a pronounced tart flavor. Tartaric acid is present naturally in grapes and bananas and has been shown to improve the flavor of grape and lime-flavored beverages. Tartaric acid may aid in the treatment of glucose intolerance and digestion.

Acetic acid is a colorless liquid having a sour flavor. Although it is most frequently associated with vinegar, this acid has a wide range of different applications in a variety of industries. Acetic acid is a colorless liquid that is composed of chemical compounds.

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Answer: A change in color is not always a chemical change. If one were to change the color of a substance in a non-chemical reaction scenario, such as painting a car, the change is physical and not chemical.

Solid → Liquid: Melting

Solid → Gas: Sublimation

Liquid → Gas: Vaporization

Gas → Liquid: Condensation

Explanation:

Answer:

14. 21.51 liters

15. 12.9 centimeters

16. 3400 milliliters

Explanation:

I don't really know how to show the work

There are 5.01 × 10-⁷grams in 4.07 x 10¹⁵molecules of calcium hydroxide.

HOW TO CALCULATE MASS:

The mass of a substance can be calculated by multiplying the number of moles in the substance by its molecular mass.

However, given that the number of molecules in calcium hydroxide is 4.07 x 10¹⁵molecules, we need to calculate the number of moles in Ca(OH)2 as follows:

no. of moles of Ca(OH)2 = 4.07 x 10¹⁵ ÷ 6.02 × 10²³

no. of moles = 0.676 × 10-⁸

no. of moles = 6.76 × 10-⁹ moles.

Molar mass of Ca(OH)2 = 74.093 g/mol

Mass of Ca(OH)2 = 74.093 × 6.76 × 10-⁹ moles

Mass = 5.01 × 10-⁷grams.

Therefore, there are 5.01 × 10-⁷grams in 4.07 x 10¹⁵molecules of calcium hydroxide.

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Answer:

What are the advantages of titration?

Titrimetric analysis commonly referred to as volumetric analysis offers distinct advantages over cumbersome gravimetric methods:

Speed of analysis.

Instantaneous completion of reactions.

Greater accuracy due to minimization of material loss involved in decanting, filtration, precipitation or similar operations.

Explanation:

Disadvantages

It is a destructive method often using up relatively large quantities of the substance being analysed.

It requires reactions to occur in a liquid phase, often the chemistry of interest will make this inappropriate.

It can produce significant amounts of chemical waste which has to be disposed of.

It has limited accuracy.

hope this helps Please inform me if its helpful

The advantages of titration:

Disadvantages

Titration is a quantitative technique where a solution of a known concentration is used to determine the concentration of the unknown solution.

Titration is a technique where a solution of known concentration is used to determine the concentration of an unknown solution.

The Titration Process Is Influenced by the Following Factors:

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Minerals are solid substances with a fixed crystal structure and a unique chemical composition. Processing ore sometimes involves crushing or grinding minerals. Prehistoric people used flints for knives and arrowheads. The average American house contains about 250,000 pounds of minerals. Early Human culture used rocks as simple tools as early as 2. 6 million years ago.

Minerals are solid substances and are characterized by a fixed crystal structure and a unique chemical composition.

Early hominids used rocks as simple tools before the advent of modern civilization where other materials were used.

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Answer:

1. naturally occurring

2. crushing

3. flint

4. 250,000

5. hominids

Answer:

Answer: Zinc nitride (Zn3N2) is an inorganic compound of zinc and nitrogen, usually obtained as (blue)grey crystals. It is a semiconductor. In pure form, it has the anti-bixbyite structure.

Chemical formula: Zn3N2

Space group: Ia-3, No. 206

EC Number: 215-207-3

Appearance: blue-gray cubic crystals

Explanation:

The systematic Iupac name for the internal alkyne is : 4-octyne

When only one type of carboxylic acid is made the internal alkyne will be symmetric and the compounds can be 3-hexane or 4-octyne but given that one of the reactants is propyl iodide. Therefore

The Internal alkyne will have an Iupac name 4-octyne

Hence we can conclude that the systematic Iupac name for the internal alkyne is 4-octyne

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Answer:51.1%

Explanation:

Mass percent : It is defined as the mass of the given component present in the total mass of the compound. Formula used : First we have to calculate the mass of  and . Mass of  = 18 g/mole Mass of  = 7 × 18 g/mole = 126 g/mole Mass of  = 246.47 g/mole Now put all the given values in the above formula, we get the mass percent of  in . Therefore, the mass percent of  in  is, 51.1%

The formation of molecule can easily be shown by drawing Lewis dot structure. Since atom's Lewis dot structure has three dots. Therefore, in below given ways, we can have Lewis dot structure of CO.

Lewis dot structure is a way to represent the valence electron of an element in the form of dot. These are mainly beneficial in understanding the chemical formula of covalent compound.

Carbon contains four valence electrons, whereas oxygen has six. Carbon has five electrons but oxygen has seven electrons if just one link is established among carbon and oxygen atoms.

The solitary connection formed in between two atoms is insufficient to form an octet on every atom. A triple bond is required to finish the octet of the each atom in CO. The six electrons shared by these two atoms create a triple bond. The dipole moment arrow will point between carbon to oxygen.

Therefore,  in above given ways, we can have Lewis dot structure of CO.

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Answer:

1. H=2, O=1

2. H=4, O=2

3. C=1, O=1

4.

a. reactants C=1, O=2

b. products C=1, O=2

5.

a. reactants H=4, O=2

b. products H=4, O=2

6

a. reactants C=1, O=1, H=4

b. products C=1, O=1, H=4

Answer:

Section a:

1. stratosphere

2. radio waves

3. nitrogen, oxygen

4. humidity

5. smoke, fog

Section b:

1. ozone layer

2. stratosphere

3. carbon dioxide (CO2)

4. smoke

5. tropical areas

Section c:

1. false, it is clear

Hope those help and are all correct

Considering the reaction stoichiometry and Avogadro's Number, the mass of barium chloride produced is 21.6 grams.

The balanced reaction is

2 HCl + Ba → BaCl₂ + H₂

Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

Then you can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of HCl, then 1.25×10²³ molecules are contained in how many moles of HCl?

amount of moles of HCl= (1.25×10²³ molecules × 1 mole)÷ 6.023×10²³ atoms

amount of moles of HCl= 0.2075 moles

Then, 0.2075 moles of HCl react.

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Then you can apply the following rule of three: if by stoichiometry 2 moles of HCl produce 1 mole of BaCl₂, 0.2075 moles of HCl will produce how many moles of BaCl₂?

[tex]amount of moles of BaCl_{2} =\frac{0.2075 moles of HCl x 1 mole of BaCl_{2} }{ 2moles of HCl}[/tex]

amount of moles of BaCl₂= 0.10375 moles

Being the molar mass of BaCl₂ 208.24 g/mole, then the mass of barium chloride produced is calculated as:

[tex]0.10375 molesx\frac{208.24 grams}{1 mole} =21.6 grams[/tex]

Finally, the mass of barium chloride produced is 21.6 grams.

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Answer:

He put segregationists in charge of federal agencies...

Explanation:

...

Answer:

He placed segregationists in charge of federal agencies.

Explanation:

the answer is position no. 4

The mass of water, H₂O produced from the reaction is 72.06 g

We'll begin by calculating the mass of NH₄NO₃ that reacted and the mass of H₂O produced from the balanced equation.

NH₄NO₃ —> N₂O + 2H₂O

Molar mass of NH₄NO₃ = 80.03 g/mol

Mass of NH₄NO₃ from the balanced equation = 1 × 80.03 = 80.03 g

Molar mass of H₂O = 18.01 g/mol

Mass of H₂O from the balanced equation = 2 × 18.01 = 36.02 g

From the balanced equation above,

80.03 g of NH₄NO₃ reacted to produce 36.02 g of H₂O

Finally, we shall determine the mass of H₂O produced by the reaction of 160.1 g of NH₄NO₃.

From the balanced equation above,

80.03 g of NH₄NO₃ reacted to produce 36.02 g of H₂O.

Therefore,

160.1 g of NH₄NO₃ will react to produce = (160.1 × 36.02) / 80.03 = 72.06 g of H₂O.

Thus, the mass of water, H₂O produced from the reaction is 72.06 g

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