which of the following describes a physical property of copper metal? answer unselected at high temperatures, copper forms a black copper oxide. unselected copper metal is ductile. it can be ulled into thin wires. unselected copper slowly oxidizes to form a green patina, like that on the statue of liberty. unselected copper does not react with water.

Answer:

Intramolecular forces are the forces that hold atoms together within a molecule. Intermolecular forces are forces that exist between molecules.

Explanation:

Answer:

c

Explanation:

In comparison to modern, highly accurate density meters or pycnometers, hydrometers are far less accurate and temperature.

Thus,  Although they require very large sample sizes, hydrometers are rather simple to operate. Usually, 300 to 500 ml per measurement are required. Hydrometers frequently require calibration off-site as well.

With measurements taken by eye, user error is a major issue, and temperature management is especially challenging. Inaccurately bringing and maintaining samples at temperature might take a long time, and once more, user perception of temperature levels is used to determine temperature levels.

Pycnometers and hydrometers have a further problem in that the findings of alcohol measurement are challenging to evaluate and record.

Thus, In comparison to modern, highly accurate density meters or pycnometers, hydrometers are far less accurate and temperature.

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Answer:

If n = 4, then the possible values of 1 and m depend on the equation or expression being used. Without more information, it is impossible to determine what the possible values of 1 and m might be. Can you please provide more context or information about the problem you are trying to solve?

Step 1 - Deciding between ionic and covalent bond

In the ionic bond, atoms gain or lose electrons, forming ions, which attract themselves thus resulting in a very strong chemical bond. In the covalent bond, on the other hand, electrons are shared by two atoms, resulting in a molecule.

The ionic bond usually happens between a metal (low ionization energies) and a non-metal (high electron affinities), while covalent bond happens between two or more non-metal atoms.

Therefore, looking at the atoms in the substance we can discover whether it is an ionic or covalent substance.

Step 2 - Using this information to answer the exercise

Note that hydrogen gas (H2) is a molecule. Therefore, its bonds must be covalent. That is so because H is a non-metal. Whenever two non-metals bond, be they different or the same, a covalent bond arises.

Since a covalent bond is the sharing of electrons between atoms, the correct answer is item d) sharing electrons.

Answer:

1.) There are 6 carbons in the longest possible parent chain (hex-). Since there is a double bond, this is an alkene.  The lowest possible carbon the double bond consists of is the 2nd carbon. There is also a methyl group on the 2nd carbon. All together, this makes the structure: 2-methyl-2-hexene.

2.) There are 9 carbons in the longest possible parent chain (non-). The lowest possible carbons the methyl groups are on are the 3rd and 5th carbons. The lowest possible carbon the ethyl group is located on is the 4th carbon. Remember, branches are listed alphabetically. All together, this makes the structure: 4-ethyl-3,5-dimethylnonane.

3.) There are 7 carbons in the longest possible parent chain (hept-). There is a triple bond, making this an alkyne. The lowest possible carbon the triple bond consists of is the 2nd carbon. The lowest possible carbon the methyl group is on is the 4th carbon. All together, this makes the structure: 4-methyl-2-heptyne.

4.) There are 10 carbons in the longest possible parent chain (dec-). The lowest possible carbon the propyl group is on is the 5th carbon. All together, this structure is: 5-propyldecane.

5.) There are 4 carbons in the longest possible parent chain (but-). The lowest possible carbon the methyl group is on is the 2nd carbon. All together, this makes the structure: 2-methylbutane.

6.) There are 5 carbons in the longest possible parent chain (pent-). There is a double bond, making the molecule an alkene. The lowest possible carbon the double bond consists of is the 2nd carbon. The lowest possible carbon the methyl group is on is the 2nd carbon. All together, this makes the structure: 2-methyl-2-pentene.

Reactions in our natural world range from classical chemical reactions to nuclear reactions.

A classical chemical reaction is a natural process that occur when one or more elements called reactants change to form one or more products.

Chemical reactions can be speed up by the action of enzymes, which are biological catalysts capable of lowering the activation energy of the reactions.

On the other hand, nuclear reactions occur when atoms react among them to generate new elements.

Nuclear reactions can be classified into fusion reactions where atomic nuclei fuse and fusion reactions where an atomic nucleus gives rise to two different atoms.

In conclusion, Reactions in our natural world range from classical chemical reactions to nuclear reactions.

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Answer:

8.02 g of HCl could be left over by the chemical reaction

Explanation:

We propose the reaction:

HCl(aq) + NaOH (s) → NaCl (aq) + H₂O (l)

Ratio is 1:1. First of all, we determine the moles of reactants:

14 g . 1mol / 36.45g = 0.384 mol of acid

6.55 g. 1mol / 40g = 0.164 mol of base

If a determined mass of HCl, could be left; this means that the acid is the excess reagent.

For 0.164 moles of NaOH, we need 0.164 moles of HCl.

As we have 0.384 moles, (0.384 - 0.164) = 0.220 moles of acid are left over in the reaction. We convert the moles to mass:

0.220 mol . 36.45 g /1mol = 8.02 g

Answer:

C

Explanation:

Answer:

Hey, you have to solve it by Stichiometry.....answer is option A.... I have explained every option for your understanding.

Explanation:

(a.)**For option A, the volume of CO2 produced at STP will be 5.6 not 30.8 by solving equation for part I

By Stichiometry,

moles of CO2, n=11.2/22.4 = 0.5

Volume of CO2, V=11.2×0.5 =5.6

(b.)**For option B, the statement is correct

n(moles) of O2 =32/32 = 1 mol

we have to use stichiometry to find moles of CO2

n= 1/2 × 1 (coefficient of CO2/coefficient of O2) × mol of O2 (coz O2 is limiting reagent in 2nd option)

n= 0.5 mol

Mass= n × Molecular Mass

Mass= 0.5 × 44

Mass= 22g

(c.)**option C, is correct acc. to statement

(d.)**option D, is correct acc. to statement

(e.)**option E, is correct acc. to statement

Answer to this question is A part.

Hope it helps......

Answer:

fehrf beviubeibchvbiscv kie v sjb rlj jsrubw

Explanation:

Answer:

d is the answer have a good one

Answer:

true

Explanation:

They all have a hydrocarbon plus oxygen.

The given statement that "all combustion reactions have oxygen as a reactant" is true. Combustion is a type of chemical reaction where a fuel (usually a hydrocarbon) combines with oxygen gas to produce heat, light, and new chemical compounds, such as carbon dioxide and water.

For combustion to occur, there must be a fuel source, oxygen, and a source of ignition, such as a spark or heat. Oxygen acts as a reactant because it combines with the fuel source to produce the new compounds. Without oxygen, the reaction cannot occur. It is important to note that not all reactions involving oxygen are combustion reactions. For example, rusting of iron is a reaction that involves oxygen, but it is not a combustion reaction.

In combustion reactions, the heat and light produced are often used for industrial processes, transportation, or heating. However, the reaction can also be destructive if not controlled, such as in wildfires or explosions. In conclusion, all combustion reactions have oxygen as a reactant, as it is necessary for the reaction to occur and produce the desired products.

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There are 64 neutrons in an atom of Q-123 with a charge of -1.

Since the isotope Q-123 has an atomic number of 59, we know that it has 59 protons. The charge of -1 tells us that the atom has one more electron than protons, so it has 60 electrons.

To find the number of neutrons, we need to subtract the atomic number (59) from the mass number (123):

Number of neutrons = Mass number - Atomic number

Number of neutrons = 123 - 59

Number of neutrons = 64

Hence there are 64 neutrons in an atom of Q-123 with a charge of -1. It is important to note that the charge does not affect the number of neutrons in the atom, only the number of electrons. The number of protons and neutrons in the nucleus of an atom determine its identity and chemical properties.

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The required partial pressure of argon gas present in the mixture is 1.02 atm.

Dalton's law of gas states that total pressure of any mixture of gas is sum of the partial pressure of all the gases present in that mixture.

Given that,

Total pressure of mixture = 2.4 atm

Partial pressure of argon = ?

Partial pressure of oxygen = 128 mmHg = 0.168 atm

Partial pressure of helium = 167.5 mmHg = 0.220 atm

Partial pressure of neon = 760 mmHg = 1 atm

On putting all these values according to the definition we get the partial pressure of argon gas as:
Partial pressure of argon = 2.4 - (0.168 + 0.22 + 1) = 1.02 atm

Hence required partial pressure of argon gas is 1.02 atm

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Answer:

Ni(NO3)2 is the limiting reactant.

Explanation:

- First, we balance the equation...

Ni(NO3)2 + 2 KOH --->  2 KNO3 + Ni(OH)2

- Second, we find the moles of each substance...

65g Ni(NO3)2 / 182.703g Ni(NO3)2 = 0.356 mol Ni(NO3)2

58g KOH / 56.1056g KOH = 1.034 mol KOH

- Third, to make the molar ratio equal to each other for comparison, we either multiply KOH by 1/2 or multiply Ni(NO3)2 by 2 to compare the number of moles; because the Ni(NO3)2 to KOH molar ratio is 1 to 2. Note that the multiplication of moles is only for comparison. We do not use these multiplied values. We use the values from step 2...

0.356 mol Ni(NO3)2 * 2 = 0.712 mol Ni(NO3)2

0.712 mol Ni(NO3)2 < 1.034 mol KOH ... Ni(NO3)2 is the limiting reactant.

When a compound is formed, the substances are chemically bonded and lose their original properties.

A compound is made up of two or more substances that are joined with chemical bonds. The compound that is formed is different from the substances. For example, water is a compound, made up of oxygen and hydrogen.

The compounds are of different types. They are covalent compounds, ionic compounds, and intermetallic compounds.

Thus, the substances that are chemically bonded and lose their original properties are called compounds.

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700 L of water was produced if 350.0 L of carbon dioxide were made at STP.

The quantitative relationship (ratio) between reactants and products in a chemical reaction that produces gases is known as gas stoichiometry. When the created gases are presumed to be ideal and their temperature, pressure, and volume are all known, gas stoichiometry is applicable.

The ideal gas equation is PV=nRT, where n is the number of moles and R is the gas constant, P is the pressure measured in atmospheres (atm), V is the volume measured in liters (L), and

Calculations based on stoichiometry assist scientists and engineers who work in the business world in estimating the number of items they will make using a particular process. They can also assist in determining if a product will be economical to produce.

Reduced growth, reproduction, and survivability for the consumer are typically the results of a significant stoichiometric imbalance between the primary producer and consumer.

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Answer: The average atomic mass of oxygen is 15.999 amu

Explanation:

Mass of isotope O-16 = 15.995 amu

% abundance of isotope O-16= 99.759 % = \(\frac{99.759}{100}=0.99759\)

Mass of isotope O-17 = 16.995 amu

% abundance of isotope O-17 = 0.037% = \(\frac{0.037}{100}=0.00037\)

Mass of isotope O-18 = 17.999 amu

% abundance of isotope O-18 = 0.204% = \(\frac{0.204}{100}=0.00204\)

Formula used for average atomic mass of an element :

\(\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})\)

\(A=\sum[(15.995\times 0.99759)+(16.995\times 0.00037)+(17.999 \times 0.00204)]\)

\(A=15.999\)

Thus the average atomic mass of oxygen is 15.999 amu

Answer:

Converting the percent abundance into decimal form, we get:

O-16: 99.759% = 99.759/100 = 0.9975

O-17: 0.037% = 0.037/100 = 0.00037

O-18: 0.204% = 0.204/100 = 0.0020

Average atomic mass of oxygen is:

(15.995) x (0.9975) + (16.995) x (0.00037) + (17.999) x (0.0020)

= 15.955 + 0.0062 + 0.0359

= 15.997 amu

Explanation:

From PLATO

Answer: D

Explanation: crest to crest to the crust to crust to the west to west.

Answer:

1) Combustion

2)Synthesis

3)Single Replacement

4)Decomposition

5)Double Replacement

6)Synthesis

7)Double Replacement

8)Single Replacement

9)Combustion

10)Decomposition

Explanation:

Remeber, decomposisition is breaking things apart, synthesis is building them, cobusion will always make water and CO2 and will always burn O2, single replacemnt will have 1 thing replaced (single) and double replacement will have 2 things replaced (double).

Hope this helps!

Answer:

where is the question

Explanation:

The complete reaction, according to the law of conservation of mass is:

XX + YY → 2XY

The Law of Conservation is a fundamental principle in chemistry and physics. It states that in a closed system, mass cannot be created or destroyed during a chemical reaction or a physical change. The total mass of the substances involved before the reaction or change must equal the total mass of the substances after the reaction or change.

This principle is based on the understanding that atoms are not created or destroyed, but they can combine or separate to form different substances.

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The answer responses to  the structures shown in the diagram are:

A. chromosomes

C. They would be the same.

B. They are in pairs because each one comes from a different parent.

The chromosomes are in pairs because humans have a diploid number of chromosomes, meaning they have two sets of chromosomes, one inherited from each parent.

The nucleus is important in eukaryotic cells and has many important parts that help the cell work properly. There are some parts inside cells called the nuclear membrane, nucleoplasm, nucleolus, and chromatin. Chromatin is made up of DNA and other proteins.

Every part of a person's body has the same genes, but the way they are organized can be different in different types of cells. The chromosomes in our skin cells might not be the same as the chromosomes in our muscle cells, even if they come from the same person.

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Identify the structures shown.

A. chromosomes

B. mitochondria

C. nuclei

D. vacuoles

C

Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person.

A. There would be longer.

B. They would be shorter.

C. They would be the same.

D. They would be different.

Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person.

A. There would be longer.

B. They would be shorter.

C. They would be the same.

D. They would be different.

Explain why the structures are in pairs.

A. They aren't in pairs.

B. They are in pairs because each one comes from a different parent.

C. This cell is making a copy of itself.

D. The cell always has 2 copies in case 1 is damaged.

Answer:

2.295 moles of O2 are needed.

Explanation:

1st) It is necessary to write and balance the chemical reaction:

2nd) From the balanced reaction we can see that to produce 2 moles of chlorine gas (Cl2), 1 mole of oxygen gas (O2) is needed. So, with a mathematical rule of three we can calculate the amount of oxygen gas moles needed to produce 4.59 moles of Cl2:

Finally, 2.295 moles of O2 are needed

Answer:

The final concentration of the Randyne in grams per milliliter = 0.011 g/mL

Explanation:

As we know

C1V1 = C2V2

C1 and C2 = concentration of solution 1 and 2 respectively

V1 and V2 = Volume of solution 1 and 2 respectively

Substituting the given values, we get -

\(50 * 15 = X * (15+50)\\X = 11.54\) mg/mL

The final concentration of the Randyne in grams per milliliter = 0.011 g/mL

The final concentration of the Randyne in this solution is 0.01 g /mL.

It is very important to know the dilution methods in a chemistry lab. The dilution from the stock solution can be prepared by using the formula,

\(C_1V_1 = C_2V_2\)

Where,

\(C_1\)- concentration of the stock solution

\(V_1\) - the volume of the stock solution

\(C_2\) - concentration of the diluted solution

\(V_2\) - the volume of diluted solution

Put the values in the formula,

\(50 \times 15 = C_2 \times 75 \\\\C_2 = \dfrac {750}{75 }\\\\C_2 = 10{\rm \ mg/mL \ \ \ or} \\\\ C_2 = 0.01 \rm \ g/mL\)

Therefore, the final concentration of the Randyne in this solution is 0.01 g /mL.

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