which of the following elements have seven valance electrons in its outer shell?

a. hydrogen
b. fluorine
c. magnesium
d. oxygen

Answer:

la photosintesis viene de la clorofila de la planta

Answer:

CH4(g) +2O2____ CO2(g) +2H2O (l)

Answer:

this atom has 7 valence electrons.

Explanation:

Answer:

C. Dipole

Explanation:

When a molecule is unevenly charged but overall neutral, for example, one atom has a negative charge, and one has a positive charge, they balance each other out when they bond and are known as a polar molecule. Dipole just means 2 poles (positive and negative).

Answer:

B. Molarity will decrease

Explanation:

Molarity is one of the measures of the molar concentration of a solution. It is calculated by dividing the number of moles of the solute by the volume of the solvent. This means that the higher the amount of solute in relation to the volume of solvent, the higher the molarity of that solution.

In essence, adding water to a solution dilutes it i.e it increases the solvent's volume in relation to the solute, causing the molarity to decrease. In a nutshell, diluting a solution (by adding water or more solvent) causes the molarity of such solution to decrease. For example, if water is added to a 0.70 molar solution of CuSO4, the molarity of the solution will DECREASE.

Answer:

D.

the sum of the masses.

Explanation:

Answer:

it is the cell wall :)

Explanation:

Answer: The answer is C

Answer:

No region is safe from flooding. All 50 states are subject to flash floods.[1]

Flash floods can bring walls of water from 10 to 20 feet high.[2]

A car can be taken away in as little as 2 feet of water.[3]

To stay safe during a flood, go to the highest ground of floor possible. If your skin comes in contact with flood water, make sure to wash it with soap and disinfected water because the contents are unknown.[4]

Flooding is caused by spring thawing (snow and frozen grounds melting in the spring), heavy rains, snow melt runoffs, flash floods, and mudflows.[5]

Floods are the most widespread natural disaster aside from wildfires. 90% of all U.S. natural disasters declared by the President involve some sort of flooding.[6]

In preparation for a flood, it is important to stock up on first aid items, non-perishable foods, 3 gallons of water per person for 3 days, battery operated radio for weather reports, extra batteries, personal hygiene necessities.[7]

Based on Floodsmart, a 2,000 square foot home undergoing 12” of water damage could cost more than $50,000.[8]

Since flood damage is almost never covered by homeowners insurance, flood insurance is important for people living in high-risk flood zones.[9]

To stay safe during a flood, go to the highest ground of floor possible. If your skin comes in contact with flood water, make sure to wash it with soap and disinfected water because the contents are unknown.[10]

Communities particularly at risk are those located in low-lying areas, near water, or downstream from a dam.[11]

Answer:

The original U.S. voting system had some similarities with that of Athens. In Athens, every citizen could speak his mind and vote at a large assembly that met to create laws. Citizens were elected to special councils to serve as organizers, decision-makers, and judges. The Greek idea of democracy was different from present-day democracy because, in Athens, all adult citizens were required to take an active part in the government. ... This form of government is called direct democracy. The United States has a representative democracy.

Answer:

A

Explanation:

Well, the human skeletal system produce red blood cells into and for the body.

Answer:

d

Explanation:

can you help me with my question In the extended simile of the underlined passage from Paragraph 15 of "A Wagner Matinee," the narrator makes an observation about the soul that aring rokol been A. it is like a strange moss on a dusty shelf that, with excruciating suffering, can wither and die y for I the be B though after excruciating suffering it may seem to wither, the soul never dies, C. excruciating, interminable suffering that goes on for half a century can kill the soul.

c i think

Explanation:

if it's not look it up

Answer: [tex]S[/tex] is the limiting reagent

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]    

[tex]\text{Moles of} S=\frac{10.0g}{32g/mol}=0.3125moles[/tex]

[tex]\text{Moles of} Ag=0.700moles[/tex]

[tex]2Ag+S\rightarrow Ag_2S[/tex]  

According to stoichiometry :

1 mole of [tex]S[/tex] require = 2 moles of [tex]Ag[/tex]  

Thus 0.3125 moles of [tex]S[/tex] will require=[tex]\frac{2}{1}\times 0.3125=0.6250moles[/tex]  of [tex]Ag[/tex]

Thus [tex]S[/tex] is the limiting reagent as it limits the formation of product and [tex]Ag[/tex] is the excess reagent.

Answer:

243.15 K y -22 F

Explanation:

Para convertir la temperatura desde grados Celsius (°C) a kelvin (K) se debe sumar 273.15 K:

K = °C + 273.15 = -30°C + 273.15 K = 243.15 K

Para convertir desde grados Celsius (°C) a Fahrenheit (F), se multiplica por 9/5 y se suma 32, como sigue:

F = (9/5 x °C) + 32 = (9/5 x (-30°C)) + 32= -22 F

Por lo tanto, una temperatura de -30°C corresponde a 243.15 Kelvin y -22 grados Fahrenheit.

Answer and Explanation: (MAKE ME BRAINLIEST PLEASE)

The name of Fe(NOsh is iron(III) nitrate.

The name of  Cu3P  is copper(I) phosphide.

The name of GaAs  is gallium arsenide.

The name of Be(HCO3)2 is beryllium hydrogen carbonate.

The name of Al(CN)  is aluminium cyanide.

Explanation :

Ionic compound : It is defined as the compound which is formed when electron gets transferred from one atom to another atom.

Ionic compound are usually formed when a metal reacts with a non-metal.

The nomenclature of ionic compounds is given by:

1. Positive is written first.

2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.

3. In case of transition metals, the oxidation state are written in roman numerals in bracket in-front of positive ions.

It is an ionic compound because it is formed by the combination of one polyatomic anion (nitrate ion) and cation (iron ion). The charge on iron ion is (+3) and the the charge on nitrate ion is (-1).

Thus, the name of  is iron(III) nitrate.

It is an ionic compound because it is formed by the combination of copper cation and phosphorous anion. The charge on copper is (+1) and the the charge on phosphorous ion is (-3).

Thus, the name of  is copper(I) phosphide.

It is an ionic compound because it is formed by the combination of gallium cation and arsenic anion. The charge on gallium is (+3) and the the charge on arsenic ion is (-3).

Thus, the name of  is gallium arsenide.

It is an ionic compound because it is formed by the combination of one polyatomic anion (hydrogen carbonate ion) and cation (beryllium ion). The charge on beryllium ion is (+2) and the the charge on hydrogen carbonate ion is (-1).

Thus, the name of  is beryllium hydrogen carbonate.

It is an ionic compound because it is formed by the combination of one polyatomic anion (cyanide ion) and cation (aluminium ion). The charge on aluminium ion is (+3) and the the charge on cyanide ion is (-1).

Thus, the name of  is aluminium cyanide.

Answer:

Answer:

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3 3 4

2 4

2 5

4

3 3 4

2 4

2 5

4

(( ) )) 143 /

( ) 98 /

( ) 108 /

( ) 474.8 /

484.25 (( ) ) 3.39

143

75.46 ( ) 0,77

98

270 ( ) 2,5

108

546 ( ) 1,15

474,8

m

M

M NH PO g mol

M H SO g mol

M N O g mol

M SnF g mol

NH PO mol

H SO mol

N O mol

SnF mol

According to the mole concept, there are 0.77 moles in 75.46 g of sulfuric acid.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

Number of moles is calculated as, mass/molar mass=75.46/98=0.77 moles.

Thus, there are 0.77 moles in 75.46 g of sulfuric acid.

Learn more about moles,here:

https://brainly.com/question/26416088

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Answer: Its B.

Explanation:

i cant quite explain

Answer:Attemted Failed

Maybe try to search

In a different way like:

what is the ingredient of cake

Instead of

how to make Cake

Answer:

The anions that can act as bases (conjugate bases of weak acids) have the capability to hydrolyse water and produce OH− ions. Cl−, Br−NO−3, SO2−4 are all conjugate bases of strong acids that don't have the capability to hydrolyse water and so they aren't basic.

Explanation:

Answer:

A

Explanation:

Answer: a) No, both are different.

b) Ramesh- 9.9%

  Sarika - 10%

Explanation:

According to the solution prepared by Ramesh,

Mass of sugar he took (Solute) = 10 g

Mass of water he took (Solvent) = 100 g

Thus Mass % of the solution =

According to the solution prepared by Sarika,

Mass of sugar she took (Solute) = 10 g

Mass of Solution she took  = 100 g

Thus Mass % of the solution =

Explanation:

Answer: they both eat fish

Explanation:

Answer:

B. An Arrhenius acid increases [OH–] in the Solution

Answer:

An Arrhenius acid increases [H+] in the solution.

Explanation:

i just took the test and this was the answer-

Answer: Hence, the approximate molecular weight of the poymer is 64106 g/mol

Explanation:

[tex]\pi=CRT[/tex]

where,

[tex]\pi[/tex] = osmotic pressure of the solution = 2.012 mm Hg =  0.0026 atm

i = Van't hoff factor = 1 (for non-electrolytes)

Mass of solute (polypeptide) = 1.8274 g  

Volume of solution = 274 mL

R = Gas constant = [tex]0.0821Latm/Kmol[/tex]

T = temperature of the solution = [tex]31.40^0C=(273+31.40)K=304.4K[/tex]

Putting values in above equation, we get:

[tex]0.0026=\frac{1.8274 g\times 1000}{M\times 274ml}\times 0.0821\times 304.4[/tex]

[tex]M=64106g/mol[/tex]

Hence, the approximate molecular weight of the poymer is 64106 g/mol

Answer:

Mycelial threads

Explanation:

Through the mycelium threads, a fungus or in this case a mushroom absorbs nutrients from its environment. It does this in a two-stage process. First, the hyphae secrete enzymes onto or into the food source, which break down biological polymers into smaller units such as monomers. Mycelium is an important food source for many soil invertebrates.

Answer:

wassssssssssssssssap

Explanation: