Write the symbol for every chemical element that has atomic number greater than 70 and atomic mass less than 181.2 u.

Answer:

74.04 liters of hydrogen gas are produced.

Explanation: According to reaction, 2 mol of HCl gas gives 1 mole of hydrogen gas, then 6 moles of HCl gas will give: moles of hydrogen gas that is 3 moles.

The pressure of the hydrogen gas at 298 K = 0.990 atm

The volume occupied by the hydrogen gas = V

Number of hydrogen has moles = 3 moles

PV=nRT

V = 74.04 L

74.04 liters of hydrogen gas are produced.

Answer:

38.2 liters Is the answer

Explanation:

The elements that have least protons to those having the most protons in the atoms are:

B. C, Al, P, Cl

There is an equal number of protons and electrons in an atom. So when moving across a period in a periodic table the number of electrons increases which also shows the increases in a number of protons. So as the atomic number increases, the number of protons and electrons also increases.

Thus, the order of elements having least to greatest protons are:

C, Al, P, Cl

C has 6 atomic number, Aluminium has 13 atomic number , Phosphorus has 14 atomic number and atomic number of chlorine is 17.

Thus, option B is correct.

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Answer:

SYMBOLS, FORMULAS AND MOLAR MASSES

OBJECTIVES

1. To correctly write and interpret chemical formulas

2. To calculate molecular weights from chemical formulas

3. To calculate moles from grams using chemical formulas

INTRODUCTION

Part I. Symbols and formulas

An element is a homogeneous pure substance made up of identical atoms. All matter is made

up of elements and, since chemistry is the study of matter, it is convenient to use symbols to represent

the elements rather than using the entire name.

By international agreement, specific symbols are assigned to each element (Note: This means

that while names of the elements vary with language, symbols are constant throughout the world.) Each

element is assigned a one- or two-letter symbol. The first letter is capitalized, the second (if there is

one) is not. While this often seems trivial, it is in fact a very important point. For example, in chemical

language Co represents cobalt, which is a metal and an element, while CO represents carbon monoxide,

a compound which is a colorless, odorless gas! Even when there is not an obvious correspondence,

for instance "MN", it can cause confusion. Do you mean the element manganese? Did you forget a

letter and mean something else? Are you using "M" to represent something else entirely? Chemists

sometimes use "M" to represent any metal. It is well worth the trouble to memorize the symbols for

common elements.

Since compounds consist of elements, the chemical formulas of compounds also consist of

elements with subscripts used to denote the number of atoms per molecule. If there is no subscript, it is

implied that there is one of that kind of atom. Ones never appear in chemical formulas. Not only do

subscripts denote ratios of atoms, they also denote the ratio of moles of element to one mole of

compound. Parentheses can be used to show groups of atoms, with the subscripts showing how many

groups there are. Parentheses are not used if there is only one group.

Examples: For one mole of the following compounds, how many moles of each element are

present?

MgCl2 1 mole Mg, 2 moles Cl

Mg(NO3)2 1 mole Mg, 2 moles N, 6 moles O

NaNO3 1 mole Na, 1 mole N, 3 mole O

AgCl 1 mole Ag, 1 mole ClPart II. Molar Masses

Each atom has a different size and therefore a different mass. The relative masses of each

element can be found on the periodic table. For example, one atom of magnesium weighs 24.31 amu

(atomic mass units). However, one mole of magnesium weighs 24.31 g. (Moles were planned that

way!) Since one mole of MgCl2 consists of one mole of magnesium and two moles of chlorine, the

mass of one mole of MgCl2 must be the sum of the masses of the elements. The mass of one mole of a

substance is called the molar mass or molecular weight.

Examples: What is the molar mass of the following compounds?

MgCl2 24.31 + 2(35.45) = 95.21 g/mol

Mg(NO3)2 24.31 + 2(14.01) + 6(16.00) = 148.33 g/mol

NaNO3 23.00 + 14.01 + 3(16.00) = 85.01 g/mol

AgCl 107.9 + 35.45 = 143.4 g/mol

(Note: Yes! You DO have to count significant figures when calculating molecular weight/molar

mass. However, the number of significant figures may vary depending on which periodic table you use.)

Chemists are generally interested in number of moles. Unfortunately, it is impossible to measure

moles directly. However, masses are easily measured, and if the chemical formula of the compound is

known, the molar mass can be used to determine the number of moles. The molar mass is defined as:

molar mass = grams/moles = g/mol (1)

Moles may be calculated by using molar mass as a conversion factor in dimensional analysis where

molar mass in grams = 1 (exactly) mole of compound (2)

This method is used in multi-step calculations. For example, if 0.873 g of MgCl2 is weighed out, it

is 9.17 x 10-3

moles.

1 mole

0.873g x 95.21 g = 9.17 x 10-3

mol MgCl2 (3)

However, 0.873 g of AgCl is only 6.09 x 10-3

mol.

1 mole

0.873g x 143.4 g = 6.09 x 10-3

mol AgCl (4)Molar mass may also be used to relate moles to grams. For example, 0.158 mol of MgCl2 is 15.2 g.

0.158 mol x 95.21 g = 15.2 g MgCl2 (5)

1 mol

Percent is used to express parts per one hundred. Usually in chemistry, it refers to

g of species of interest x 100 = % (6)

g of whole thing

Example: For the % Mg in MgCl2: In one mole of MgCl2, there are 24.31 g of Mg (molar mass of Mg,

the part we are interested in) and 95.21 g of MgCl2 (the whole thing), so %Mg in MgCl2 is

(24.31/95.21) x 100 = 25.53% Mg (7)

PROCEDURE

Work individually.

The formula for calcium phosphate is Ca3(PO4)2. Weigh about 2 g of calcium phosphate to the

nearest 0.001 g. In other words, you do not have to have exactly 2.000g, but you must know the

weight you have exactly. Acceptable results include but are not limited to: 1.985g , 2.035g, 2.314g

etc.

Be sure to report all results with the correct number of significant figures and appropriate units!

1. Ionic compounds are named using the cation and the anions in the compounds respectively.

The name of the cation remains thesame as it's element while the anions name changes by adding another suffix to the elements name.

Sometimes, the number of positive charge of a cation is added in front of it's name before adding the anion's name.

2. Correct names of the compounds above

CaCl² - Calcium chloride

CuS - Copper Sulphate

Li³P - Lithium Phosphide

CuBr - Copper (1) Bromine

NaOH - Sodium Hydroxide

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When naming a compound, which of these is written first?

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Provide an acidic or basic environment to optimize digestion hydrochloric acid (HCl).

Food is broken down into more digestible, smaller pieces throughout the digestion process so that the body can absorb and use them.

The digestive system's secretions produce the acidic or basic environment necessary for effective digesting. In order to create a highly acidic environment, the stomach secretes hydrochloric acid (HCl), which lowers the pH of the stomach.

The small intestine, on the other hand, is kept at a pH that is somewhat basic to enhance the activity of the digestive enzymes that break down carbs, proteins, and lipids.

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Answer:

i am doing this in science also i would like to know if u know

Explanation:

First, we'll look at the ideal gas equation,

PV = nRT

The temperature and pressure are said to be constant; Additionally, R is a constant already. Along these lines, we get:

V = constant * n

The direct proportional equation is as follows: As a result, we get:

V/n = constant

V₁/n₁ = V₂/n₂

Replace V₂ with the qualities and address.

V₂ = (4 * 1.48) / 0.864

V₂ = 6.85

In the end, 6.85 Liters of gas must be present, so we must add:

6.85 - 4 = 2.85 liters

The volume of a gas is directly proportional to its mole volume at a fixed temperature and pressure.

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Q- At 4.00 L, an expandable vessel contains 0.864 mol of oxygen gas. How many liters of oxygen gas must be added at constant temperature and pressure if you need a total of 1.48mol of oxygen gas in the vessel?

Answer:

3 moles of carbon, 3 moles of hydrogen and 1 mole of oxygen

Answer:

NaS2 has two elements within: Sodium & Sulfur.

Basically, the mass percentage of Na2S is:

Sodium = 58.914%

Sulfur = 41.086%

In total, that would equal: 100%.

Explanation:

Well, we know this because Na (Sodium) has 2 atoms & Sodium has no number after it so, that would be an ordinary one atom.

So, knowing that there are more Sodium's than Sulfur, the mass percentage would be higher, than the percentage of Sulfur.

The specific measurement that will be affected is the volume of gas collected in the graduated cylinder. Since not all the gas was caught, the volume measured will be less than the actual volume of gas released. This will not change the molar mass calculation.

The molar mass is calculated by using the mass of the gas and the volume of the gas collected. Even though the volume measured was less than the actual volume, the mass of the gas collected should still be accurate. Therefore, the molar mass calculation should not be affected.
Hi! I'm happy to help with your question.

a. The specific measurement that will be affected is the volume of gas collected in the graduated cylinder.

b. This mistake will likely result in a decrease in the calculated molar mass. Since the volume of gas collected is lower than it should be, the molar mass calculation will be based on a smaller amount of gas, leading to a lower value than the actual molar mass.

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Molar mass of SnO_2:-

\(\\ \sf\longmapsto 118+2(16)=118+32=150g/mol\)

\(\\ \sf\longmapsto No\:of\;moles=\dfrac{Given\:mass}{Molar\:mass}\)

\(\\ \sf\longmapsto No\:of\;moles=\dfrac{80.8}{150}\)

\(\\ \sf\longmapsto No\:of\:moles=0.5mol\)

1 mol of SnO_2 produces 2mol of water

Ethylene C2H2 , ascorbic acid formula C₆H₈O₆, naphthalene Chemical formula C₁₀H₈.

The relative ratios of the various atoms in a compound are given by an empirical formula. The ratios are still valid at the molar level. H 2 O is made up of two hydrogen atoms and one oxygen atom. Similar to this, 1.0 mole of H2O is made up of 1.0 mole of oxygen and 2.0 moles of hydrogen.

Originally known as hexuronic acid, ascorbic acid is an organic molecule having the formula C 6H 8O 6. Although impure samples may appear yellowish, it is a white solid. Water readily dissolves it, resulting in moderately acidic solutions. It is a gentle reducer.

There are two enantiomers (mirror-image isomers) of ascorbic acid, generally referred to as "l" (for "levo") and "d." (for "dextro"). The most prevalent isomer is the l one, which is a naturally occurring form of vitamin C (also known as a "vitamer") and is necessary for both humans and many other animals to survive. Scurvy is caused by vitamin C deficiency and used to be a serious condition affecting sailors on lengthy sea trips. Due to its antioxidant qualities, it is utilized as a nutritional supplement and food additive.

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The color of the starch-iodine complex in Experiment 29: Rates of Chemical Reactions I is d. blue-black.

Experiment 29: Rates of Chemical Reactions I is one of the many experiments performed in a general chemistry laboratory that involves the determination of the rate of a chemical reaction experimentally. The experiment usually involves the reaction between sodium thiosulfate and hydrochloric acid that takes place in a beaker. This reaction causes the solution to become cloudy because of the formation of solid sulfur.

In this experiment, the reaction rate is measured using a stopwatch to time the duration of the reaction. The reaction rate is determined based on how long it takes for the solution to turn cloudy.The color of the starch-iodine complex in Experiment 29: Rates of Chemical Reactions I is blue-black.

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Density = Mass/Volume but it can also be rearranged to:

Volume = Mass/Density

Given in the question:

Mass - 318.97 g

Density - 19.3 g/cm3

Calculation

Density = Mass/Volume

= 318.97/19.3

= 16.52 \(cm^{3}\)

Therefore, the volume of the gold is 16.52 \(cm^{3}\)

2.084*10^23 molecules are in 32.6 grams of potassium oxide.

A chemical's molar mass is its weight in grammes for one mole. A mole is a unit used to measure how many atoms, molecules, and ions are present in a substance. The number of molecules in a mole of any substance is 6.022 x 1023.

Although the terms "molecular mass" and "formula mass," which refer to molar mass specifically for molecular compounds, are frequently used interchangeably, their definitions vary according to the most reputable sources.

Molar mass of K2O is 94.196g

Given mass = 32.6g

1 mole of K2O = 94.196g

So, 32.6g will be 32.6/94.196g

i.e. 0.346moles

1 mole of K2O = 6.023*10^23molecules of

0.346moles will be 2.084*10^23 molecules

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The total mass of the products is 853.8 g.

We know that we have to apply the principles of stoichiometry so as to be able to obtain the mass of the mass of the products and then the total mass of the products that is obtained in the reaction.

We have that in the question; 496. 5 grams of lead II nitrate reacts with potassium bromide is such a way that the lead II nitrate would be completely consumed in the reaction. This means that the lead II nitrate is the limiting reactant in the reaction.

Number of moles of the lead II nitrate = 496. 5 grams /331 g/mol

= 1.5 moles

If 1 mole of  lead II nitrate produces 1 mole of lead II bromide

Mass of lead II bromide produced = 1.5 moles * 367 g/mol

= 550.5 g

If 1 mole of lead II nitrate produces 2 moles of potassium nitrate

1.5 moles of lead II nitrate produces  1.5 * 2 /1

= 3 moles of  potassium nitrate

Mass of  potassium nitrate = 3  moles * 101.1

= 303.3 g

Total mass produced = 550.5 g + 303.3 g

= 853.8 g

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When q and w are positive, energy flows into the system.

When atoms establish or break chemical bonds, chemical processes take place. Reactants are the substances that begin a chemical reaction, while products are the compounds that are created as a result of the reaction.

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Answer:

0.347

Explanation:

Al is the limiting reagent.

Explanation:

The stoichiometry of the reaction is such that 4 moles of Al are required for every 3 moles of diatomic oxygen. This means that if the ratio of Al to diatomic oxygen is greater than 4/3, then the oxygen is the limiting reagent. If the ratio of Al to diatomic oxygen is less than 4/3, then Al is the limiting reagent.

The problem state that the ratio of Al to diatomic oxygen is

0.32

0.26

=

16

13

=

48

39

<

52

39

=

4

3

The ration of Al to diatomic oxygen is less than 4/3, so Al is the limiting reagent.

We can also see this if we ask the question "How much Aluminum" is required to completely react 0.26 moles of diatomic oxygen??

0.26

moles

O

2

×

4

moles

A

l

3

moles

O

2

≈

0.347

moles

A

l

So it would take 0.347 moles of Al to completely react with all of the oxygen, however there is only 0.32 moles of Aluminum present, so there is not enough Al to react with all of the oxygen, and so we say that the Al is the limiting reagent.

The mass of Aluminum are needed to produce 21.6 grams of Aluminum oxide (Al₂O₃) is

Mass of any element is equal to the product of its number of moles and molar mass.

For the compound, Aluminum oxide (Al₂O₃)

The atomic masses of Aluminum is 23 and oxygen is 16.

Molecular or molar mass = ( 2 × 23 ) + ( 3 × 16 ) units

M = 46 + 48 = 94 units

The mass of Aluminum in 1 mole of aluminum oxide ,46 grams in 94 grams

Mass of Aluminum in the given 21.6 g of Aluminum oxide will be;

94 grams of Aluminum oxide contains 46 grams of Aluminum.

21.6 grams of Aluminum oxide will contain ( 46 / 94 ) × 21.6 = 10.57g of Aluminum.

Therefore, 10.57g of Aluminum are needed to produce 21.6 grams of Aluminum oxide (Al₂O₃)

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Answer:

92.01 g/mol

Explanation:

So first you need to find the empirical formula by the percents. That would be, assuming that you have 100 grams of the the sample, divide each quantity of each element found by its respective molar mass.

30.4 g of N ÷ 14 g/mol N= 2.17 mol of N

69.6 g of O ÷ 16g/mol= 4.35 mol of O

You can establish now the empirical formula.

N2.17O4.35,

but since you can't have a decimal subscript, you divide each subscript by the minimum subscript

NO2

So then you're said that the molecular formula derived from that empirical formula has 2 nitrogen, so you multiply all the subscripts, by 2:

N2O4

-Dinitrogen Tetraoxide

-Nitrogen oxide (IV)

Then all you have to do is find the molecular mass of the compound using the periodic table and what you obtain is the molar mass.

remember: molecular mass is correspondent to molar mass.

Answer:

q=m*c*•

Explanation:

•=50-2

m=25

c=4.18

q=?

use this

The charge of each peptide at ph 7.4 and in what order will they elute from the column are: 1. Marker: The charge of Marker at pH 7.4 will be +2, as the amino acids in the peptide are all positively charged at this pH.

What is peptide?

A peptide is a short chain of amino acids linked together by peptide bonds. Peptides are an important class of biological molecules that are involved in many essential processes in the body, including metabolism, immune system regulation, and the transmission of signals within cells. Peptides are found in proteins and can also be synthesized artificially for therapeutic purposes, such as for the treatment of certain diseases.

2. Saddle: The charge of Saddle at pH 7.4 will be +1, as the positively charged amino acids are partially neutralized by the negatively charged amino acids in the peptide. Saddle will elute second because it has a lower charge than Marker.

3. Cracked: The charge of Cracked at pH 7.4 will be 0, as the positively charged amino acids are completely neutralized by the negatively charged amino acids in the peptide. Cracked will elute last because it has the lowest charge.

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This formula is wrong because a substituent can't attach with 1st carbon in chain or the here the no. of carbon in carbon chain is 8

The outer electronic configuration of molybdenum (Mo) is represented by the option B: \(5s^1 4d^5.\)

The outer electronic configuration of the element Mo (Z=42), which corresponds to the electron arrangement in the outermost energy level (valence shell), is given by the electron configuration notation.

The electron configuration of molybdenum (Mo) can be determined by referring to the periodic table. Molybdenum is in period 5 and group 6, so its electron configuration can be written as:

\(1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^1 4d^5\)

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Everyday examples of temperature effects on reaction rate include:

1. Food spoilage: Higher temperatures cause food to spoil faster due to increased microbial activity.
2. Rusting of iron: The rate of rust formation increases with temperature, as the chemical reactions involved occur more rapidly.
3. Baking: In the oven, the increased temperature accelerates the chemical reactions that cause dough to rise and brown.
4. Digestion: Enzymes in our body work optimally at specific temperatures, which is why our body maintains a constant temperature of around 37°C.
5. Ice melting: The rate at which ice melts increases as the temperature rises, due to the faster motion of molecules at higher temperatures.

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Answer: Enzymes

Explanation: entzymes are natural catalysts, e.g. Amylase is an enzyme

We anticipate that the resulting aqueous solution will be basic.

Weak acids are those that do not dissociate completely in solution. A weak acid is defined as any acid that is not a strong acid. A weak acid's strength is determined by how much it dissociates; the more it dissociates, the stronger the acid.

A conjugate base is the base member, X-, of two compounds that transform into one another by gaining or losing a proton. In a chemical reaction, the conjugate base has the ability to gain or absorb a proton.

Calcium propionate [Ca(CH₃CH₂COO)₂

We know that Calcium propionate dissolves completely in water.

So,

Ca(CH\(_3\)CH\(_2\)+COO)\(_2\)→Ca\(^2^+\) +2CH\(_{3}\)CH\(_2\)COO−

Water can protonate the propionate anion. When everything is balanced,

CH\(_3\)CH\(_2\\\)COO−+H2O⇌CH\(_3\)CH\(_2\)COOH+OH−

We anticipate that the resulting aqueous solution will be basic.

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Ferns reproduce with spores which existed the longest in Earth history.

Gymnosperms reproduce with cones and has needle-like, waxy leaves.

Angiosperms reproduce with flowers and newest type of plant in Earth history.

Ferns reproduce with spores that existed the longest in Earth, gymnosperms reproduce through the formation of cones having needle-like, waxy leaves whereas angiosperms reproduce with flowers which turns into seed. The newest type of plant in Earth history is also belongs to this group.

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Answer:

D. Mitochondria

Explanation:

This is the one that makes the energy that powers the cell, aka, the powerhouse.