2. The table below shows the atomic numbers of elements of the periodic table represented by letters I to Q The letters are not the actual chemical symbols for the elements. Element J Atomic number www I 且 } T H 3 Lithiur K 7 Witrogen 8 Select two elements which belong ta Olygin The same period of the periodic table Jk The same group of the period table. Select the element which: twitt form a divalent andon Reacts murst vigorously with water. 9 N Home 10 (Ink (1mk bºr (Ink 12 May Nashy 13 Aluminian C 14 St Veer​

Answers

Answer 1

Explanation:

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Related Questions

Which component or condition of a reaction affects the rate of the reaction but is not consumed during the course of the reaction?.

Answers

Answer:

A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process.

Explanation:

Answer:

Catalyst

Explanation:

Which of the following is the best definition of a chemical change?
A. A change in a substance where one or more new substances form
B. A change in a substance where no new substance forms
C. A change in a substance where energy is conserved
OD. A change in a substance where a phase change occurs

Answers

Answer:A is correct

Explanation:

Changes in which measurements do not shift the equilibrium of a chemical system

Answers

Any Change in the amount of an inert gas into a gas-phase equilibrium at constant volume does not result in a shift of the equilibrium of a chemical system. This follows the equilibrium law.

What is Equilibrium law ?

According to this principle, Adding an inert gas into a gas-phase equilibrium at constant volume does not result in a shift.

This is because the addition of a non-reactive gas does not change the partial pressures of the other gases in the container.


While the total pressure of the system increases, the total pressure does not have any effect on the equilibrium constant.

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what happens when you mix an element into a solution with lesser reaction?

Answers

When an element is placed into a solution with lesser reaction, the reaction rate will be slow.

What is rate of a reaction?

The rate of a reaction is the rate which reactants molecules are converted or the products molecules are formed.

The rate of a reaction increases with increase in concentration of the reactants and decreases with decrease in concentration.

Therefore, when an element such as a metal is placed in solution of low concentration such as very dilute acid, the reaction rate will be slow.

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What is the molar concentration of
a solution with a volume of 1.5 L
containing 660 g Ca3(PO4)2?

Answers

Answer:

1.42 M

Explanation:

First calculate the amount of moles.

that's done by dividing the mass with the molecular mass so 660g / 310.18 g/mol = 2.13 mol

Then you can calculate the molarity by dividing the moles with the volume so 2.13 mol / 1.5 l = 1.42 M

(without rounding: 1.418531175 M)

Answer:

1.42 M

Explanation:

Acellus

What volume of a 4.13 M lithium
nitrate solution would be needed tomake 195 mL of a 1.05 M solution
by dilution?

[?] L LINO3

I’ll give u 100 points if ur answer is correct

Answers

Answer:

0.0496

Explanation:

Well, there’s none!!! It’s just so easy…

Answer: 49.6

Explanation: It actually wants the answer it mL not L.

You examine an ice core sample from 10,000 years ago when global temperatures were unusually high. Based upon past studies and insights from current GHG levels, we expect that atmospheric levels of carbon dioxide Group of answer choices were high but methane levels were low. and methane were unusually low. and methane were unusually high. were low but methane levels were high.

Answers

Methane was unusually high is the correct option. Hence, option B is correct.

What is methane?

Methane is the simplest member of the paraffin series of hydrocarbons and is among the most potent greenhouse gases. Its chemical formula is [tex]CH_4[/tex].

As the ice compacts over some time, tiny bubbles of the atmosphere or surroundings including greenhouse gases like carbon dioxide and methane—press inside the ice. These air pocket “fossils” give samples of what the atmosphere was kind when that layer of ice formed.

Based upon past studies and insights from current GHG levels, we assume that atmospheric levels of carbon dioxide and methane were unusually low.

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When you breathe, oxygen binds to the hemoglobin in your lungs and then is released into tissue cells. What type of reaction is this? A. Haber B. Irreversible C. Reversible D. Double replacement

Answers

Answer:

i believe c. reversible

Explanation:

oxygen combines with hemoglobin and detaches

Answer:

c

Explanation:

same answer i got from quiz

2. four bulbs connoted in parallel controlled by a single pole switch using
alternating current

Answers

Answer

I think there should be two poles, a north pole and a south pole. so this statement is wrong

Based on the equation, how many grams of Br2 are required to react completely with 42.3 grams of AlCl3?

2AlCl3 + 3Br2 → 2AlBr3 + 3Cl2

66.5 grams
71.2 grams
76.1 grams
80.2 grams

Answers

Answer:

C.) 76.1 grams

Explanation:

To find the mass of bromine, you need to (1) convert grams AlCl₃ to moles AlCl₃ (via molar mass), then (2) convert moles AlCl₃ to moles Br₂ (via mole-to-mole ratio from reaction coefficients), and then (3) convert moles Br₂ to grams Br₂ (via molar mass). It is important to arrange your ratios/conversions in a way that allows for the cancellation of units (the desired unit should be in the numerator).

Molar Mass (AlCl₃): 26.982 g/mol + 3(35.453 g/mol)

Molar Mass (AlCl): 133.332 g/mol

2 AlCl₃ + 3 Br₂ --> 2 AlBr₃ + 3 Cl₂

Molar Mass (Br₂): 2(79.904 g/mol)

Molar Mass (Br): 159.808 g/mol

42.3 g AlCl₃          1 mole               3 moles Br₂           159.808 g
------------------  x  -----------------  x  ----------------------  x  -------------------  =
                            133.332 g         2 moles AlCl₃            1 mole

=  76.0 g Br

*Our answers are slightly different most likely because we used slightly different molar masses*

Which of the following best describes a mixture? A. A substance that results when another substance is separated into its component parts B. A substance composed of two or more elements chemically combined C. A substance that results when two or more substances combine physically but not chemically D. A particle consisting of two or more atoms chemically combined​

Answers

Answer: C. A substance that results when two or more substances combine physically but not chemically

how to minimize the harmful effects of power station on our environment​

Answers

Burning low-sulfur-content coal to reduce SO2 emissions. Some coal-fired power plants cofire wood chips with coal to reduce SO2 emissions. Pretreating and processing coal can also reduce the level of undesirable compounds in combustion gases.

54.0 g Al creates up to 102 g Al2O3 and 64.0 g O2 creates up to 136 g Al2O3.

What is the theoretical yield (amount of Al2O3 formed) for this reaction?

[?] g Al₂O3

Answers

The theoretical yield of the product is 204 g of the product .

What is the theoretical yield?

The theoretical yield is the yield of the reaction as obtained from the stoichiometry of the reaction.  

The reaction equation is given as 4Al + 3O2 → 2Al2O3

Number of moles of Al = 54.0 g/27 g/mol = 2 moles

Number of moles of oxygen = 64.0 g/32 g/mol = 2 moles of O2

Hence,

If 4 moles of Al yields 2 moles of Al2O3 then 204 g of the product is obtained.

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Answer: 102

Explanation:

Enter your answer in the provided box. Crystalline silicon has a cubic structure. The unit cell edge length is 543 pm. The density of the solid is 2.33 g/cm3. Calculate the number of Si atoms in one unit cell. atoms/cell

Answers

Based on the calculations, the number of Si atoms in one unit cell is equal to 8 atoms/unit cell.

How to calculate the volume?

Mathematically, the volume of a unit cell can be calculated by using this formula:

V = a³

V = (543)³ × (1 × 10⁻¹²)³ × (100)³

Volume, V = 1.60 × 10⁻²² cm³.

Next, we would determine the mass:

Mass = density × volume

Mass = 2.33 × 1.60 × 10⁻²²

Mass = 3.73 × 10⁻²² grams.

Also, we would determine the mass of one silicon atom:

Mass = 28.09/(6.022 × 10²³)

Mass = 4.665 × 10⁻²³ g/atom.

Now, we can calculate the number of Si atoms in one unit cell:

Number = 3.73 × 10⁻²²/4.665 × 10⁻²³

Number = 8 atoms/unit cell.

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Webb has calculated the percent composition of a compound. How can he check his result?

Answers

Webb has calculated the percent composition of a compound. He can check his result by adding them to see if they equal up to 100. Why? Well, percent composition tells the quantity of elements with 100 as a base of total amount. This means that it will have to add to 100 to check the result. You would add up all of the values of percent composition of elements to see if they equal 100, and if they do, the results are accurate.

Your final answer: Webb can check his result by seeing if they add up to 100, considering that is the base total quantity.

I will give a brainley Hi guys I need help figuring out where the moderately reactive atoms are located on the periodic table and how the number of balance electrons of the light metals compared to those heavier than born

Answers

The moderately reactive atoms located in the periodic table are fluorine, chlorine, bromine, and iodine which means the halogens family.

The number of balance electrons of the light metals compared to those heavier by listing elements in the order of increasing atomic number.

What are halogen metals?

They are the five non-metals in family 7A of the periodic table. Halogens are chemical elements that form inorganic salts. In the periodic table they are part of group 17 or family 7A.

Halogens are strong oxidants and react mainly with alkali metals (Family I A) which tend to donate an electron. They also react with metals and noble gases (Family VIII A).

The chemical elements are arranged from left to right and top to bottom in order of increasing atomic number, or the number of protons in an atom's nucleus, which generally coincides with increasing atomic mass.

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The moderately reactive atoms located in the periodic table are fluorine, chlorine, bromine, and iodine which means the halogens family.

The number of balance electrons of the light metals compared to those heavier by listing elements in the order of increasing atomic number.

What are halogen metals?

They are the five non-metals in family 7A of the periodic table. Halogens are chemical elements that form inorganic salts. In the periodic table they are part of group 17 or family 7A.

Halogens are strong oxidants and react mainly with alkali metals (Family I A) which tend to donate an electron. They also react with metals and noble gases (Family VIII A).

The chemical elements are arranged from left to right and top to bottom in order of increasing atomic number, or the number of protons in an atom's nucleus, which generally coincides with increasing atomic mass.

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬

state three differences between temporary and permanent changes ​

Answers

Answer:

temporary changes are the changes which are there only for a short period if time generally temporary changes are reversible permanent changes are the changes which remain to for longer time and are not reversible

Explanation:

hope it is helpful for

A sample of a gas at room temperature occupies a volume of 24.0 L at a pressure of 602 torr . If the pressure changes to 3010 torr , with no change in the temperature or moles of gas, what is the new volume, V2

Answers

Answer:

V₂ = 4.80 L

Explanation:

Because you are dealing solely with pressure and volume, you can find the new volume using the Boyle's Law equation. The general equation looks like this:

P₁V₁ = P₂V₂

In this form, "P₁" and "V₁" represent the initial pressure and volume. "P₂" and "V₂" represent the new pressure and volume. You have been given all of the variables but V₂. Therefore, by plugging these values into the equation, you can simplify to find your answer.

P₁ = 602 torr              V₁ = 24.0 L

P₂ = 3010 torr            V₂ = ?

P₁V₁ = P₂V₂                                               <---- Boyle's Law equation

(602 torr)(24.0L) = (3010 torr)V₂             <---- Plug variables into equation

144448 = (3010 torr)V₂                            <---- Multiply 602 and 24.0

4.80 = V₂                                                 <---- Divide both sides by 3010

What volume of a 3.95 M
potassium chloride solution would
be needed to make 325 mL of a
2.76 M solution by dilution?
[?] mL of 3.95 M KCl

Answers

0.227L is the volume of a 3.95 M potassium chloride solution that would be needed to make 325 mL of a 2.76 M solution by dilution.

What are moles?

A mole is defined as 6.02214076 × 10^{23} of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

Moles of KCl in new solution

0.325dm³ x (2.76mol/dm³)

= 0.897mol.

Hence volume needed

0.897mol ÷(3.95mol/dm³)

= 0.227dm³ or 0.227L.

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What is the mass of a piece of
copper that displaces 3.0 mL
of water and has a density of
9.0 g/cm³?
mass = density x volume

Answers

Answer:

27 gm

Explanation:

Well..... the volume of the copper is   3 cm^3

9.0  g/cm^3    * 3 cm^3 = 27 gm

does anyone understand these?

Answers

Answer:

6) 47588

4.7 * 10 power 4 ( by rounding off)

7) 1 mm ---> 1,000,000

? 120

120 * 1 / 1000000

12/ 100000

0.0012

1.2 * 10 power -4.

8) Volume is the amount of space something occupies

Cyclohexene oxidation with potassium permanganate gives three different products, depending on conditions. what product (one) could not be obtained

Answers

Answer:

will you help us with that one please

You mass two substances. One substance has a mass of 22.45 g and the other has a mass of 3.1 g. What is the total mass of both objects?

Answers

Answer:

25.55 g

Explanation:

To find the total mass of both objects, you need to add the masses together.

22.45 g + 3.1 g = 25.55 g

In correct significant figures (2 sig figs to match 3.1 g), the value would be 26 g.

Answer:

answer = 25.55

Explanation:

You just have to add the mass of the two objects

A 1. 07 g sample of a noble gas occupies a volume of 363 ml at 35°c and 678 mmhg. Identify the noble gas in this sample. (r = 0. 08206 l×atm/k×mol)

Answers

The identity of the noble gas is the sample is Krypton

Ideal Gas law

From the question, we are to determine the identity of the noble gas in the sample

From the ideal gas equation, we have that

PV = nRT

∴ n = PV / RT

Where P is the pressure

V is the volume

n is the number of moles

R is the gas constant

and T is the temperature

From the given information,

P = 678 mmHg = 0.892105 atm

V = 363 mL = 0.363 L

R = 0.08206 L.atm/mol.K

T = 35 °C = 35 + 273.15 K = 308.15 K

Putting the parameters into the equation, we get

n = (0.892105 × 0.363)/ (0.08206 × 308.15)

n = 0.0128 moles

Now, we will determine the Atomic mass of the sample

Using the formula,

Atomic = Mass / Number of moles

Atomic mass of the substance = 1.07 / 0.0128

Atomic mass of the substance = 83.6 amu

The noble gas with the closest atomic mass to this value is Krypton.

Molar mass of Krypton = 83.798 amu

Hence, the identity of the noble gas is the sample is Krypton

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When a scientific theory has been tested and proved by the scientific community, it becomes a law.

True
False

Answers

Answer:

False

Explanation:

Because laws and theories are developed for different purposes, laws never become theories, and theories do not become laws.

Question 3
Not yet
answered
Points out of
If you dissolve 2.70 g of NaCl in 425 mL of water, what is the molarity of the
solution? (Report your answer to three places past the decimal point. Moodle is
looking for a number only, no units.)

Answers

Answer: 0.118M

Explanation:

The formula for molarity is: [tex]M=\frac{mol solute}{L solution}[/tex]

First, we need to find the number of moles of NaCl.

[tex]2.70gNaCl*\frac{1molNaCl}{58.44gNaCl} =0.05molNaCl[/tex]

Next, we must convert millimeters to liters. We can do that by dividing the number of mL by 1000.

[tex]\frac{425mL}{1000} =0.425L[/tex]

Now we have our needed data! All we need to do now is plug in our data to the molarity formula.

[tex]M=\frac{0.05mol}{0.425L} =0.118M[/tex]

I hope this helps! Pls mark brainliest!! :)

the screenshts below

Answers

Answer:

yes so for example one

Explanation:

yeah so

would you expect the substance to float or sink in water if mass is 25g and volume is 7 cm​

Answers

Answer:

Sink

Explanation:

For a substance to float in water, it must be less dense than water. The density of water is 1 g/cm^3. To find the density of the substance, we can do mass/volume, which in this case is 25g/7cm^3. We see that [tex]25/7 > 1[/tex], so the substance would sink.

How much sodium bicarbonate to raise alkalinity in pool.

Answers

Answer:

A rule of thumb is that 1.5 lbs. of baking soda per 10,000 gallons of water will raise alkalinity by about 10 ppm. If your pool's pH is tested below 7.2, add 3-4 pounds of baking soda. If you're new to adding pool chemicals, start by adding only one-half or three-fourths of the recommended amount.

What is the lowest energy level that contains d orbitals.

Answers

Answer:

3

Explanation

it is 3

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Could someone explain why the value of x is (-2). A Blank______ identifies the product or brand, the package contents, and other information like where the product was made, when, and by whom. Multiple choice question. Homeshoring provides companies with operational efficiencies while also resolving possible issues related to:_________ a. cost b. outsourcing jobs c. facilities d. management Read the passage from A Room of Ones Own.This may be true or it may be falsewho can say?but what is true in it, so it seemed to me, reviewing the story of Shakespeare's sister as I had made it, is that any woman born with a great gift in the sixteenth century would certainly have gone crazed, shot herself, or ended her days in some lonely cottage outside the village, half witch, half wizard, feared and mocked at. For it needs little skill in psychology to be sure that a highly gifted girl who had tried to use her gift for poetry would have been so thwarted and hindered by other people, so tortured and pulled asunder by her own contrary instincts, that she must have lost her health and sanity to a certainty.How does Woolf use language to emphasize the idea that brilliant women were often feared in the 16th century?She describes these women as psychologically tortured.She describes these women as pulled asunder.She describes these women as lonely and isolated.She describes these women as half witch, half wizard. 17, 18, 22, 31, 47 what is the next number In the square pyramid shown below, the slant height is 12 centimeters and the height of the pyramid is 7 centimeters.To the nearest whole number, find the diagonal length of the base of the pyramid. In your final answer, include your calculations with reasoning for each step. What are two ways in which the safe house of lean might influence a product owner? How many solutions does this equation have?17q - 13- 3q = 14g + 14no solutionone solutioninfinitely many solutions To counteract groupthink in a marketing team, as a manager you may decide to bring in two Who is the president's chief adviser on intelligence matters across the executive branch? Thalia, a quiz show contestant, answered 20 questions. She was awarded 2 points for every correct answer that she gave, but she was penalized 1 point for every incorrect answer. In the end, Thalia had a total of 28 points. In order to determine the number of correct and incorrect answers that she gave, a viewer at home used the system of linear equations x + y = 20 and 2 x + y = 28, with x being the number of correct answers and y being the number of incorrect answers. The viewer solved the system by using the linear combination method as shown.x + y = 20. + StartFraction Negative 2 x minus y = negative 28 over Negative x = negative 8 EndFraction. StartFraction negative x Over negative 1 EndFraction = StartFraction negative 8 Over negative 1 EndFraction. X = 8.8 + y = 20. 8 + y minus 8 = 20 minus 8. y = 12.The viewer calculated that the contestant answered 8 questions correctly and 12 questions incorrectly. What went wrong?The viewer mistakenly determined that one of the equations in the system should be x + y = 20.Instead modifications should have been made before applying the equation.The viewer mistakenly determined that one of the equations in the system should be 2 x + y = 28. Instead modifications should have been made before applying the equation.The viewer multiplied the equation 2 x + y = 28 by 1 incorrectly.The viewer added the equations x + y = 20 and Negative 2 x minus y = negative 28 incorrectly. What is muscular dystrophy example of Can you put this image back together? Type the correct order of letters below. Question 1 of 10When making an important purchase, be wary of.come directly from the manufacturer.OA. customer testimonialsOB. qualified reviewsOC. professional reviewsOD. warrantiesespecially if they What are 2 ways to send a message to your client when signed in as an accountant user?. A competitive environment where there is strong rivalry among sellers, low entry barriers, strong competition from substitute products, and considerable bargaining leverage on the part of both suppliers and customers a. is competitively unattractive from the standpoint of earning good profits. b. offers little ability to build a sustainable competitive advantage. c. is highly conducive to achieving strong product differentiation and high customer loyalty to the company's brand. d. offers moderate to good prospects for making a reasonable profit and building a sustainable competitive advantage. e. requires that industry members have a strongly differentiated product offering in order to be profitable. Twisting of an organ or a structure on itself is ________. Two planes that do not intersect are _____ parallel.sometimes always never List and explain any five skills necessary for helping others. Find the slope of the line whose equation is 3x - 4y = 7.