I need help!!!!!!! please

I Need Help!!!!!!! Please
I Need Help!!!!!!! Please

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Answer 1

Answer:

A. bacteria

Explanation:

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Question #37.P.2A.2
Which statement about the periodic table is true?
a. Elements in the same column share similar properties.
b. Elements in the same row share similar properties.
c. Elements on the left have a larger nucleus than elements on the right.
d. Elements at the top of each column have the highest atomic mass in that column.

Answers

a. Elements in the same column share similar properties.

This is because they have the same number of valence electrons, so they react and bond similarly.

Team Iphone or
Team Android

Answers

IPhone..............

hmm.......iphone ¯\_(ツ)_/¯

Beth heats a pot of water to cook pasta. What may happen as a result of adding heat

Answers

Answer:

the pasta will soften

Explanation:

the pasta will boil and will soften up as a result of it being regular pasta

How many moles of gold atoms do 3.45x10^24 gold atoms constitute?

Answers

Answer:

3.45E24

Explanation:

calculator I'm not that great at math but I'm good at science but that isn't really science but it's aix between it tho

Which of the following statements about complete metamorphosis is TRUE?
The adult form of the animal is similar to the young animal.
Only arthropods undergo complete metamorphosis.
All organisms that undergo complete metamorphosis are a caterpillar at some time.
The physical form of the young animal is completely different than the physical form of the adult.

Answers

ill answer if u answer this FAST

pls and ty https://brainly.com/question/22200936

The true statement about metamorphosis is the physical form of the young animal is completely different from the physical form of the adult.

What is metamorphosis?

Metamorphosis is the change in the structure of the animal in several stages until it changes into an adult form.

Animals that undergo metamorphosis are amphibians, insects, mollusk, crustaceans, fishes, etc.

The changes that occur in every stage are shape, nutrition form, behavior, etc.

The importance of metamorphosis is to change in every stage to reduce competition for food, predators, etc.

Thus, the correct option is D.

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Glven 4.62 mol of sodium hydroxide, NaOH, how many grams are present?

Answers

1 mole is equal to 1 moles NaOH, or 39.99711 grams.
Hope this helped

According to the mole concept , there are 184.8 grams in 4.62 moles of sodium hydroxide.

What is a mole?

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 given as, mass/ molar mass

∴mass=number of moles×molar mass

On substitution, mass= 4.62×40=184.8 g

Thus, there are 184.8 g in 4.62 mole of sodium hydroxide.

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Consider the addition of an electron to the following atoms from the fourth period. Rank the atoms in order from the most negative to the least negative electron affinity values based on their electron configurations. Atom or ion Electron configuration BrBr 1s22s22p63s23p64s23d104p51s22s22p63s23p64s23d104p5 GeGe 1s22s22p63s23p64s23d104p21s22s22p63s23p64s23d104p2 KrKr 1s22s22p63s23p64s23d104p61s22s22p63s23p64s23d104p6 Rank the electron affinity from most negative to least negative. To rank items as equivalent, overlap them. View Available Hint(s)

Answers

Answer:

Br>Ge>Kr

Explanation:

Electron affinity is the energy change that results from adding an electron to a gaseous atom(Khan Academy). It is also defined as "the amount of energy released when an electron is attached to a neutral atom or molecule in the gaseous state to form a negative ion" (Wikipedia).

Electron affinity increases from left to right in the periodic table. However, the noble gases possess a complete outermost electron shell.

Hence, electron affinity can be raked from the most negative to the least negative for the three atoms as follows; Br>Ge>Kr

What is the anion formula in sodium carbonate?

Answers

HCO3-

Sodium bicarbonate (IUPAC name: sodium hydrogen carbonate), is commonly known as baking soda or bicarbonate of soda, is a chemical compound with the formula NaHCO3. It is a salt composed of a sodium cation (Na+) and a bicarbonate anion (HCO3−). Sodium bicarbonate is a white solid that is crystalline, but often appears as a fine powder.

explanation and answer and you’ll get brain list

Answers

Answer:

Option B.

Explanation:

2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂

First we convert 9.90 g of Pb(NO₃)₂ into moles, using its molar mass:

9.90 g ÷ 331.2 g/mol = 0.0299 mol Pb(NO₃)₂

Then we convert moles of Pb(NO₃)₂ into moles of PbO, using the stoichiometric coefficients:

0.0299 mol Pb(NO₃)₂ * [tex]\frac{2molPbO}{2molPb(NO_3)_2}[/tex] = 0.0299 mol PbO

Now we convert 0.0299 mol PbO into grams, using its molar mass:

0.0299 mol PbO * 223.2 g/mol = 6.67 g PbO

So 6.67 g is the theoretical yield. With that in mind we calculate the percent yield:

% yield = 5.51 / 6.67 * 100 % = 82.6%

So the correct answer is option B.

what components of static electricity theory does Electrostatic Precipitator make use of

Answers

Answer:

Electrostatic smoke precipitators work by forcing dirty flue gas (the gas escaping from a smokestack) past two electrodes (electrical terminals), which take the form of metal wires, bars, or plates inside a pipe or smokestack

Explanation:

Name the SI base units that are important in chemistry.

Answers

Units of the SI System

There are seven base units in the SI system:

the kilogram (kg), for mass

the second (s), for time

the kelvin (K), for temperature

the ampere (A), for electric current

the mole (mol), for the amount of a substance

the candela (cd), for luminous intensity

the meter (m), for distance

Which of the following is an empirical formula ?

Answers

Answer:

Explanation:

In any empirical formula problem you must first find the mass % of the elements in the compound. ...

Then change the % to grams. ...

Next, divide all the masses by their respective molar masses. ...

Pick the smallest answer of moles and divide all figures by that.

Since our answer for magnesium is not close enough to round to the nearest whole number we must choose a factor to multiply all the figures by that will yield us whole numbers

Lastly, the coefficients calculated in the previous step will become the subscripts in the chemical formula.

HELP ANYONE THERE
At a research lab, a scientist carelessly pours cultures of living microbes down the drain. Which type of pollution is this?

Question 4 options:

toxic


sediment


nutrient


bacterial

Answers

A scientist that carelessly pours cultures of living microbes down the drain represents a type of bacterial pollution.

What is bacterial pollution?

Bacterial pollution refers to the uncontrolled proliferation of bacteria in the surrounding environment and ecosystems.

Bacterial pollution can be a subject of concern because bacteria may be pathogenic microorganisms.

Bacterial pollution may cause serious harm to the public health and the well-being of a population.

In conclusion, a scientist that carelessly pours cultures of living microbes down the drain represents a type of bacterial pollution.

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Doctors are investigating the case of a patient with defective proteins. Which organelle of the cell is most likely the cause?

lysosome
cell membrane
cytoplasm
ribosome

Answers

Answer: lysosome

Explanation:

How many milligrams of AgNO3 is required to completely react with 81.5 mg LiOH?
Balanced equation: AgNO3 + LiOH = AgOH + LiNO3

Answers

Answer:

[tex]m_{AgNO_3}=577.6mg[/tex]

Explanation:

Hello there!

In this case, according to the given chemical reaction, it is first necessary to compute the moles of reacting LiOH given its molar mass:

[tex]n_{LiOH}=81.5mg*\frac{1g}{1000mg}*\frac{1mol}{23.95g} =0.0034molLiOH[/tex]

Thus, since there is a 1:1 mole ratio between lithium hydroxide and silver nitrate (169.87 g/mol) the resulting milligrams turn out to be:

[tex]m_{ AgNO_3}=0.0034molLiOH*\frac{1molAgNO_3}{1molLiOH} *\frac{169.87gAgNO_3}{1molAgNO_3} *\frac{1000gAgNO_3}{1gAgNO_3} \\\\m_{AgNO_3}=577.6mg[/tex]

Best regards!

Answer:

AgNO3+Li-->LiNO3+Ag

It is already balanced.

And turns out to be M AgNO3=577.6mg

Hope this helps!

_BaS + _PtF2 → _BaF2 + _Pts

Answers

[tex]\huge\underline\mathbb\pink{ANSWER\::}\\\\[/tex]

_BaS + _PtF2 → _BaF2 + _Pts

Barium Sulfide + Platinum(II) Fluoride = Barium Fluoride + Platinum(II) Sulfide.

=> 1 BaS + 1 PtF2 → 1 BaF2 + 1 PtS

[tex]\\\\\\[/tex]

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Determine the number of atoms of O in 22.3 moles of Al2(CO3)3.

Answers

Answer:

8.05 x 10^25 atoms O

Explanation:

moles O = moles Al2(CO3)3 x (6 moles O/1 mol Al2(CO3)3) = 22.3 x 6 = 133.8 moles O

atoms O = moles O x Avogadro number = 133.8 x 6.02 x 10^23 = 8.05 x 10^25 atoms O

#9 answer with explanation

Answers

Answer:

A.  6.0 mol H₂O

Explanation:

3 mol O₂ x  [tex]\frac{2 mol H2O}{1 mol O2}[/tex] = 6 mol H₂O

Aluminum sulfate reacts with barium chloride to form the insoluble compound, barium sulfate. The reaction proceeds according to the balanced equation below:

1Al2(SO4)3 + 3BaCl2 → 2AlCl3 + 3BaSO4

Marie reacts 150 g of aluminum sulfate with 200 g of barium chloride in order to produce insoluble barium sulfate for her crystallography studies. Determine the limiting and excess reactants for this reaction.

Molar mass aluminum sulfate: 342.15 g/mol
Molar mass barium chloride: 208.23 g/mol
Molar mass barium sulfate: 233.38 g/mol

Answers

Answer: [tex]BaCl_2[/tex] is the limiting reagent and [tex]Al_2(SO_4)_3[/tex] is the excess reagent.

Explanation:

To calculate the moles :

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

[tex]\text{Moles of aluminium sulphate}=\frac{150g}{342.15g/mol}=0.438moles[/tex]

[tex]\text{Moles of barium chloride}=\frac{200g}{208.23g/mol}=0.960moles[/tex]

The balanced chemical reaction is:

[tex]Al_2(SO_4)_3+3BaCl_2\rightarrow 2AlCl_3+3BaSO_4[/tex]  

According to stoichiometry :

3 moles of [tex]BaCl_2[/tex] require = 1 mole of [tex]Al_2(SO_4)_3[/tex]

Thus 0.960 moles of [tex]BaCl_2[/tex] will require=[tex]\frac{1}{3}\times 0.960=0.320moles[/tex]  of [tex]Al_2(SO_4)_3[/tex]

Thus [tex]BaCl_2[/tex] is the limiting reagent as it limits the formation of product and [tex]Al_2(SO_4)_3[/tex] is the excess reagent as it is left.

What specialized plant structures increase the probability of successful reproduction?

Answers

Answer:

The pistil and the stamen.

Explanation:

Please Mark Me Branliest.

The pistil and the stamen are the specialized  structures increase the probability of successful plant reproduction

what is reproduction in plants ?

Reproduction in Flowering Plants occur both asexually and sexually, flowering plants or angiosperms, use the sexual mode of reproduction.

Reproduction in Flowering Plants occurs in the flower as  both male and the female gametes are present in it, various parts of flower involve in the process of reproduction.

There are four important steps in the reproduction of flowering plants. such as Pollination, Gametogenesis, Fertilization

The flower is a specialized structure where reproductive part of the plant, containing the male and female reproductive organs which facilitate fertilization.

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What is  the correct name of the acid corresponding to the BrO3- oxoanion  ​

Answers

Answer:

hello

Bromate is a bromine oxoanion and a monovalent inorganic anion. It is a conjugate base of a bromic acid.

Explanation:

thanks

Iron + chlorine gas yields iron (III) chloride

Answers

Answer:

[tex]2Fe +3Cl_{2} -> 2FeCl_{3}[/tex]

Explanation:

In order to have a balanced chemical reaction, you need coefficients of 2, 3 and 2 before each substance in this equation. Chlorine is diatomic so it occurs as a molecular pair when a gas.

answer both questions with explanation and answer will give brain list

Answers

Answer: 10.  39.7 g [tex]CH_3OH[/tex]

11. 650 g of [tex]HgO[/tex]

Explanation:

To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]

a) moles of [tex]H_2[/tex]

[tex]\text{Number of moles}=\frac{5.0g}{2.0g/mol}=2.5moles[/tex]

[tex]CO(g)+2H_2(g)\rightarrow CH_3OH(l)[/tex]

According to stoichiometry :

2 moles of [tex]H_2[/tex] produce = 1 mole of [tex]CH_3OH[/tex]

Thus 2.5 moles of  [tex]H_2[/tex] produce=[tex]\frac{1}{2}\times 2.5=1.25moles[/tex]  of [tex]CH_3OH[/tex]

Mass of [tex]CH_3OH=moles\times {\text {Molar mass}}=1.25moles\times 32g/mol=39.7g[/tex]

Thus 39.7 g of [tex]CH_3OH[/tex] will be produced from 5.0 g of hydrogen.

11. [tex]2HgO(s)\rightarrow 2Hg(l)+O_2(g)[/tex]

According to stoichiometry :

1 mole of [tex]O_2[/tex] is produced by = 2 moles of [tex]HgO[/tex]

Thus 1.50 moles of  [tex]O_2[/tex] are produced by =[tex]\frac{2}{1}\times 1.50=3moles[/tex]  of [tex]HgO[/tex]

Mass of [tex]HgO=moles\times {\text {Molar mass}}=3moles\times 216g/mol=650g[/tex]

Thus 650 g of [tex]HgO[/tex] woukd be decomposed to produce 1.5 mol of oxygen

#8 explain and answer

Answers

Answer:

B. The limiting reactant determines the maximum amount of product that can be formed.

_BF3 + ___Li2SO3 -->
_B2(SO3)3 +LiF

How many grams of B2(SO3)3 can be made from 2.16 moles of Li2SO3?

Round to two decimal places

Answers

I’m on the same question

The transfer of energy is called
work
power
kinetic energy
potential energy

Answers

Kinetic energy. I’m pretty sure that that that that is is so the right answe

1. Which kingdom is made up of only autotrophs?
A. Protista
I
B. Animalia
C. Plantae
D. Phylum

Answers

Answer: I believe it's C

Hope this helped<3

Can you please make my answer brainly

Which of the following is the Brønsted-Lowry definition of an acid?​

Answers

Answer:

A Brønsted-Lowry acid is any species that can donate a proton (H +) to another molecule. A Brønsted-Lowry base is any species that can accept a proton from another molecule. In short, a Brønsted-Lowry acid is a proton donor (PD), while a Brønsted-Lowry base is a proton acceptor (PA).

A solution of the primary standard potassium hydrogen phthalate (KHP), KHC8H4O4 , was prepared by dissolving 0.4877 g of KHP in about 50 mL of water. Titration of the KHP solution with a KOH solution of unknown concentration required 21.66 mL to reach a phenolphthalein end point. What is the concentration of the KOH solution

Answers

Answer:

The impact of dinosaurs caused Dwayne Johnson to beat paper in rock paper scissors as the weak strength of the plants on the moon are diabolical in the atmosphere.

Explanation:

Thats why me and Selena Gomez share the same light bulb.

Which of the following molecules is the least polar?

A) H-H

B) H-CI

C) H-F

D) H-I

Answers

Answer: A) H-H is least polar

Explanation:

Electronegativity is defined as the property of an element to attract a shared pair of electron towards itself. The more is the difference in electronegativity, the more polat the bond is.

1. H-H : Electronegativity difference = electronegativity of hydrogen - electronegativity of hydrogen =2.1 -2.1= 0

2.   H-Cl : Electronegativity difference = electronegativity of chlorine - electronegativity of hydrogen = 3-2.1 = 0.9

3. H-F : Electronegativity difference  = electronegativity of fluorine - electronegativity of hydrogen= 4-2.1= 1.9  

4.   H-I : Electronegativity difference = electronegativity of iodine - electronegativity of hydrogen= 2.5 -2.1= 0.4

Thus the least electronegativity difference between the bonded atoms is in H-H , this is least polar.

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