Webb is testing samples of different elements. One sample is a dull, yellow solid that
breaks into powdery pieces when he hits it with a hammer. How should Webb classify
the yellow solid?
As a metal
As a nonmetal
As a gas
As a metalloid

Answer:

Chlorine

Explanation:

Answer:

C. Mass

Explanation:

Answer:

[tex] \huge 3.322 \times {10}^{ - 5} \: \: moles \\ [/tex]

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{2.00 \times {10}^{19} }{6.02 \times {10}^{23} } \\ \\ = 3.322 \times {10}^{ - 5} \: \: moles[/tex]

Hope this helps you

Answer:

Explanation:it is c

Answer:

C The amount of empty space between the water particles will decrease

Explanation:

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your answer is correct good luckk!!!:)

Answer:

Number of elements= 2

Number of subscripts= 1

Number of of atoms= 5

What is the coefficient? - C. 5

Answer:

Explanation:

The new volume can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

Since we are finding the new volume

[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]

From the question we have

[tex]V_2 = \frac{25 \times 4.38}{0.65} = \frac{109.5}{0.65} \\ = 168.46153...[/tex]

We have the final answer as

Hope this helps you

Answer:

.

Explanation:

Nucleus is present at the centre of atom. It contains protons and neutrons. It is very small as compared to the atom.

Answer:

It is a part of a cell which controls all the activities in the cells and contains the genetic information of the cell that is to be passed down to the next cell when it reproduces.

Explanation:

It is a part of a cell which controls all the activities in the cells and contains the genetic information of the cell that is to be passed down to the next cell when it reproduces.  

The molarity of a solution : 2.24

Molarity shows the number of moles of solute in every 1 liter of solution or mmol in each ml of solution

[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]

Where

M = Molarity

n = number of moles of solute

V = Volume of solution (L)

4.83 moles of NaCl in 2.16 L solution

n = 4.83

V = 2.16 L

Molarity :

[tex]\tt M=\dfrac{4.83}{2.16}=2.2361\rightarrow 3~sig~figs=2.24[/tex]

Answer:

D

Explanation:

Answer: B

Explanation:

liquid to solid

Answer:[tex][Kr]4d^{10}5s^25p^1[/tex]

Explanation:

The element Indium with atomic number 49 will have 49 protons and 49 electrons in it.

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom. The electrons are filled according to Afbau's rule in order of increasing energies and the nearest noble gas is Krypton with 36 electrons.

The electronic configuration in terms of noble gas configuration is:  

[tex]In:49:[Kr]4d^{10}5s^25p^1[/tex]

The noble-gas notation for the element indium is [Kr} 4d¹⁰5s²5p¹. The correct option is B.  [Kr] 5s2 4d10 5p1

From the question,

We are to write the electron configuration of the element Indium, using the appropriate noble gas notation.

The noble gas that comes before Indium (In) is Krypton (Kr). Therefore, the noble gas that will be used in the notation is Krypton.

Indium has an atomic number of 49 while Krypton has an atomic number of 36. This means we will fill in 13 more electrons.

The electron configuration for the element indium using the noble-gas notation is

[Kr} 4d¹⁰5s²5p¹

Hence, the noble-gas notation for the element indium is [Kr} 4d¹⁰5s²5p¹. The correct option is B.  [Kr] 5s2 4d10 5p1

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Answer:

Lower Heart Rate

Athletes' heart rates tend to be lower than heart rates of non-athletes. A low resting heart rate is generally a sign of good cardiovascular fitness and efficiency. A well-trained athlete may have a normal resting heart rate of only 40 beats per minute, compared with the average heart rate that ranges from 60 to 100 beats a minute.

Lower Disease Risk

Athletic types may have better overall health and be less apt to develop certain diseases. Regular exercise boosts your immune system and lowers the risk of serious health conditions such as cancer and heart disease. Physical activity can also reduce the risk of type 2 diabetes and osteoporosis while helping to manage cholesterol levels and blood pressure. You gain about two hours of additional life expectancy for each hour of regular exercise, according to the American Heart Association.

Psychological Effects

Athletes may have better mental clarity and focus than non-athletes. Exercise increases the flow of oxygen, which has a direct impact on brain function, explains the American Heart Association. Exercise can help improve your memory and reduce negative feelings, such as anger, tension, anxiety and depression.

A comprehensive study of the academic performance of North Carolina high school student-athletes in North Carolina over a three-year period attests to the positive psychological effects of athletic capabilities. Researchers discovered obvious differences between athletes and non-athletes. The study of nearly 127,000 high school students found dropout rates were lower and grade point averages were higher in students who participated in sports. The study was led by Dr. Roger Whitley in collaboration with the North Carolina High School Athletic Association.

Motivated by Excellence

Athletes, especially competitive athletes, have high ambitions. It's a trait that allows them to persevere through setbacks and failures and to come out the other side stronger. Athletes are highly motivated individuals who set their sights on a prize and are single-minded in their pursuit of excellence. They are propelled by passion to become the best they can be and the benefits of that inner drive are a higher level of self-esteem and confidence.

Explanation:

Explanation: Crystallization or crystallization is the process by which a solid forms, where the atoms or molecules are highly organized into a structure known as a crystal.

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Answer

Incidentally, they all form dew but because grass is closer to the soil, which maintains heat longer than the air where tree leaves are found, you will find more condensation in that region. Also, higher up the wind and sun will allow faster evaporation which makes the dew less noticable on tree leaves.

Explanation:

Preferred objects of dew formation are thus poor conducting or well isolated from the ground, and non-metallic, while shiny metal coated surfaces are poor infrared radiators. ... If the wet soil beneath is the major source of vapor, however (this type of dew formation is called distillation), wind always seems adverse.

Answer:

0.0500L of 3.00M HCl are needed to react completely

Explanation:

Hydrochloric acid HCl reacts with sodium carbonate, Na2CO3, as follows:

2HCl + Na₂CO₃ → 2NaCl + H₂O + CO₂

Where 2 moles of HCl reacts per mole of Na₂CO₃

To find the volume of 3.00M HCl needed to react completely we need first to calculate the moles of Na₂CO₃ added and, with this chemical equation we can solve for moles of HCl as follows:

Moles Na₂CO₃:

0.750L * (0.100moles Na₂CO₃ / L) = 0.0750moles

Moles HCl:

0.0750moles Na₂CO₃ * (2 moles HCl / 1 mole of Na₂CO₃) = 0.150 moles of HCl

Volume of 3.00M HCl:

0.150 moles of HCl * (1L / 3.00moles) =

Answer:electron

Explanation:

Answer:

Valence electrons are the electrons in the outermost shell, or energy level, of an atom.example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell. We can write the configuration of oxygen's valence electrons as 2s²2p⁴.

Answer:

Ke1/2mv2

Explanation:

Hope this helps

Answer:

KE 1/2 MV2

ExplanationExplanationExplanationExplanation: hope this helps

Answer:

they can be over a short period of time. so true

Explanation:

Answer:

lemme guess is it transportation??

Answer:

The excited state electron configuration of an atom indicates the promotion of a valence electron to a higher energy state.

Answer:A = $90

B = $390

Explanation:

The aspect of the environmentally sustainable society has not been soil erosion.

An environmentally sustainable society has been the one that has been able to meet the current and future needs of the generation. The plantation of trees, reducing the greenhouse effect, and the method for the generation of a sustainable environment has been the characteristic of a sustainable society.

The soil erosion results in damage to the soil with the flow of the upper layer of soil from the water flow. The soil erosion will be resultant in damage to the environmentally sustainable society.

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Answer:

Fluorine

Explanation:

Fluorine has 9 total electrons. The first two are in the 1s level, and the remaining electrons are on the outer level of the atom, with 2 in the s level and 5 in the p level. The electron configuration is 1s2 2s2 2p5.

Answer:

Aluminum even after being an active metal is used as a structural metal due to its toughness, high strength, lightweight, and resistance to the process of corrosion. It is resistant to corrosion as its reactivity gets suppressed due to the formation of an aluminum oxide film which is protective in nature, on its surface. Passivation is the term for the formation of the protective coating.

Answer: The lowest possible whole number coefficient for water is 1.

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble  water and remain in solid form are represented by (s) after their chemical formulas.

The balanced chemical reation for aqueous solutions of lithium hydroxide and acetic acid react to yield lithium acetate and water is:

[tex] LiOH(aq)+CH_3COOH(aq)\rightarrow CH_3COOLi(aq)+H_2O(l)[/tex]

Thus the lowest possible whole number coefficient for water is 1.

In the balanced equation for given reaction, the lowest possible whole number coefficient for water is one.

Stoichiometry of any reaction will tells about the relative amount of species presents before and after the chemical reaction.

Reaction between the lithium hydroxide and acetic acid is a neutralization reaction, as here lithium hydroxide is a base and acetic acid is a acid as a result of which it produces water molecule and lithium salt of acetate. And balanced equation for this will be represented as:

LiOH(aq) + CH₃COOH(aq)  CH₃COOLi(aq) + H₂O(l)

In the above equation all entities are present in equal amounts on both the sides and from the stoichiometry of the reaction it is clear that coefficient of water is 1.

Hence, 1 is the whole number coefficient for water.

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