5. Base your answer to the following question on the informationbelow and on your knowledge of chemistryA metal worker uses a cutting torch that operates by reactingacetylene gas, C2H2(g), with oxygen gas, O2(g), as shown inthe unbalanced equation below.CH,(g) + 0,(g) → CO2(g) + H2O(g) + heat

We do not have enough information to deduce the isotope that would have nine neutrons. Option 5

The atom is composed of subatomic particles. The subatomic particles that are in the atom are such that we have the electrons that are negatively charged, the protons that are positively charged and the neutrons that are uncharged.

Now, we know that the number of neutrons is obtained as the difference between the mass number and the atomic number of the atom. In this case, we only have the mass numbers and not the atomic numbers thus we do not have sufficient information.

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Answer:

N2O is an empirical formula

Explanation:

A.) P4O10   NO:  Can be reduced to P2O5

B.) C2H4    NO:  Can be reduced to CH2

C.) H2O2     NO:  Can be reduced to H O

D.) N2O     YES, the formula cannot be reduced any further.

Answer:

Pb, Sn, Te, S, Cl

Explanation:

The number of electrons that hydrogen needs in order to have a full shell of valence electrons are one valence electron.

Valence shell electrons refer to the electrons that are found in the outermost shell of atoms of elements.

Valence electrons are the electrons that are involved in the chemical reactions of atoms of elements.

Atoms of elements take part in chemical reactions in order to achieve an octet or duplet structure which confers stability to the atoms.

Duplet refers to two complete valence electrons while octet refers to eight complete valence electrons.

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Answer:

You have to record it before

Scientist mean when he or she says an object is at rest then the object is not moving relative to its surroundings

Velocity of the object is said to be uniform when its speed and direction does not change and the object at rest has uniform speed of zero all the time and does not even change the direction and when object is at rest position then the velocity is zero such an object will not change its state of motion that's why when he or she says an object is at rest the scientist says that the object is not moving relative to its surroundings

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Answer:

archaeologists

Explanation:

Meteorologist: weather man

Paleontologist: a scientist who studies the history of life on Earth through the fossil record.

Agriculturalist: One who practices agriculture, a farmer, a gardener.

archaeologists: Archaeologists can work for research organizations, consulting and cultural resource management firms, government agencies, and museums.

0.83 moles present in 15 grams of water .

moles=given mass/molar mass

given mass=15 grams

molar mass, water=18 gram

moles=given mass/molar mass

moles=15/18

moles=0.83

The mole concept is a helpful technique to quantify the amount of a material. When dealing with particles at the atomic (or molecular) level, it is recognized that even one gram of a pure element has a vast number of atoms. The mole concept is widely used in this context. The most used unit of measurement is the "mole," which is a count of a significant number of particles.

The number 6.02214076*1023, also known as the Avogadro constant, is usually denoted by the letter "NA". Among the elementary things that may be represented in moles are atoms, molecules, monoatomic and polyatomic ions, as well as other particles (such as electrons).

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Hydronium ion concentration increases by 100 fold on decreasing the pH of solution from 4 to 2.

In order to compute pH, the log of the hydronium ion concentration was used.

pH = -log [Hydronium ion concentration]

So, at pH 2.0 number of hydronium ions are 10^-2

And at pH 4.0 number of hydronium ions are 10^-4

By decreasing pH there will be 100 times more hydronium ions.

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The atom's radius and mass increase from top to bottom. The density of elements from top to bottom also increases in a periodic table.

Density of Sn= Mass of Sn/Volume of Sn

                     =24.3968/7.28

                     =3.49 g/ml*ml/cm³

                     =3.49 g/cm³

It is accurate to assume that the density of Sn will fall between that of Si and lead .  the mass number and radius of the atoms increase from group to group as we move from top to bottom in a periodic table.. The density rises because the increase in mass number is greater than the increase in radius. Simply multiplying by the molar mass of the gas  allows one to derive the formula for mass density from the formula for number density. Do not forget that the mass is equal to the moles (n) times the molar mass (M).  Smaller masses can be measured in grams instead of kilograms (kg), which is the standard SI unit for mass.

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Answer: 1st one is 1 N2 + 3 H2 > 2 NH3

               2nd one is 2 KCLO3 > 2 KCL+3 O2

              3rd one is 2 NaCL + 1 F2 > 2 NaF+CL2

> are the arrows

The numbers in front of the other numbers are the coefficient.

The numbers behind the numbers are the exponents.

Land surfaces are much darker so they absorb much more solar radiation than water. Most of the solar radiation is reflected by water which leads in reflecting the solar radiation that reaches the surface back in to the atmosphere.

How does this occur?

Due to lower specific heat of sand it heats up faster than water. On the other hand water requires one calorie of energy to raise the temperature of one gram of water by one degree Celsius. Sand takes 19 calories per gram to raise the temperature of the sand by 1 degree Celsius.  While Sand requires fewer calories to raise its temperature one degree Celsius and that’s why it heats up faster than water.

Land absorbs more solar radiation the land surface retains more heat as do the vegetation for energy.

Therefore, during this experiment the sand heats up much faster than water. This happens because of the specific heat of the sand that initiates the heating rapidly under the lamp as the time passes.

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Answer: Quadrant 1: (1/3, 2 1/3)

Quadrant 2: (-1 1/3, 3 1/3)

Quadrant 3: (-3, -10), (-3 1/3, -1 1/3)

Quadrant 4: (9, -1), (1 1/3, -1 1/3)

Explanation:

Graph these coordinates on an XY plane to visualize which quadrant they land in.

Explanations:

(i) Moles for K

mass = 89.3% = 89.3g

Mol. mass K =39.0983g/mol

∴ n = mass/molmass

=89.3/39.0988

=2.28 moles

(ii) Moles for N

mass = 10.7% = 10.7 g

Mol. mass N =14.0067g/mol

∴ n = mass/molmass

=10.7g/ 14.0067g/mol

=0.76 moles

• K= 2.28 /0.76 = 2.9898240669737 ≈ 3

• N=0.76/0.76 = 1

Based on the mole fraction, the mass percentage of K₂SO₃ in the  solution is 23.0%

The mass percentage of K₂SO₃ in the given solution is determined from the mole fraction as follows:

The mole fraction of K₂SO₃ = 0.0328 moles

The moles of water in the solution = 1 - 0.0328 moles

The moles of water in the solution = 0.9672 moles

The mass of K₂SO₃ = 0.0328 * 158.26 g

The mass of K₂SO₃ = 5.19 g

The mass of water in the solution = 0.9672 * 18.016

The mass of water in the solution = 17.42 g

Total mass of solution = 5.19 + 17.42

Total mass of solution = 22.61 g

Mass percent of K₂SO₃ = 5.19/22.61 * 100%

Mass percent of K₂SO₃ = 23.0%

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Answer:

one valence electron

Explanation:

K is the symbol for potassium, and the number of valence electrons can be found through its' group on the periodic table. Hence, it has one valence electron.

To calculate the mass of Helium, we look up in the periodic table the atomic mass. This is equal to 4.003 g/mol.

Now, we apply the following relation to doing the conversion:

The mass of a Helium sample that contains 0.448 moles of He is 1.793 g

Copper is made up of two isotopes ⁶³Cu(62.9296 amu) ⁶⁵Cu(64.9278 amu) Giving copper atomic weight of 63.546 then the percentage abundance of each isotope ⁶³Cu = 70% and  ⁶⁵Cu = 30.848%

Isotopes are the members of a family of elements that all have the same number of protons and different numbers of neutrons

Here given data is

⁶³Cu = 62.9296 amu

⁶⁵Cu = 64.9278 amu

atomic weight = 63.546

We have to calculate percentage abundance of each isotope = ?

Let the natural abundance of ⁶³Cu is x

The natural abundance of ⁶⁵Cu 100−x

atomic weight  is 63.546

Then 100×63.546 = 63x + 65(100−x)

= 6354.6 = 63x + 6500−65x = 6500−2x

= 2x = 145.4

= x = 72.7≃70

Hence the natural abundance of ⁶³Cu is is 70%

Therefore for ⁶⁵Cu the calculation the also same and  ⁶⁵Cu =  30.848%

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The bond formed between two nonmetals, which are usually very similar in their tendency to lose or gain electrons, is the covalent bond. This bond involves the sharing of one or more electron pairs between the two atoms.

What is covalent bond?

A covalent bond is produced by the equal sharing of electrons from both participating atoms. This sort of bonding involves a shared pair or bonding pair of electrons. The sharing of bonding pairs will ensure that the atoms reach stability in their outer shell, analogous to the atoms of noble gases.

Elements with very high ionisation energies are incapable of transmitting electrons, while elements with very low electron affinity are incapable of absorbing electrons.

Atoms of such elements tend to share electrons with atoms of other elements or atoms of the same element in such a way that both atoms achieve octet configuration in their respective valence shells and thus achieve stability. Covalent Bond refers to such a link formed by the sharing of electron pairs among distinct or similar kinds.

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An element that is oxidized is one that loses electrons, losing electrons increases its oxidation state. Now, the more electrons there are in the last energy level of the element, that is, valence electrons, the easier it will be for this element to lose them. We can identify valence electrons in the periodic table, the group to which the element belongs indicates how many valence electrons it has. Let's see what the oxidation state of the elements is:

F:7

Li:1

N:5

Be:2

O:6

We see that Lithium is the one with the fewest valence electrons, it has only one valence electron, so this will be the element that is most likely to be oxidized.

Answer: 2. Li

Answer: It decreases as it goes down and increases as it goes to the right.

Explanation: This is because as it goes down, the elements are becoming bigger which makes the distance from the proton and electron to become further, causing the attraction to weaken. While as it goes to the right across a period, it increases because the number of protons increase and we know that if there are more protons, the pull of the electrons from the nucleus becomes stronger.

If x = − 4,  number line shows the value of |x| is 4 tick mark to the left of zero.

given that :

x = -4

The absolute value is the distance from zero. The absolute value is always positive.

| x | = | -4 | = 4

The absolute value = distance from the zero.

a number line contains negative and positive number . number to the right side of zero is positive and to  the left side of zero is negative. Absolute value means how far the number is from zero.

Thus, If x = − 4,  number line shows the value of |x| is 4 tick mark to the left of zero.

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The species that act as acid are the ones that donates H⁺ in the reaction.

Since we are working with an equilibrium, we have to consider both directions.

From left to right, we have H₂O turning into OH⁻ because it lost one H⁺, so H₂O is acting as an acid in the forward reaction.

From right to left, we have CH₃NH₃⁺ tunrning into CH₃NH₂ because it lost one H⁺, so CH₃NH₃⁺ is acting as an acid in the backwards reaction.

So, the species that act as acids are H₂O and CH₃NH₃⁺, I and II only.

Nuclear Model - Supported by Rutherford's gold foil experiment.

Nuclear Model - A small, dense, positively-charged nucleus surrounded by a negatively-charged electron cloud.

Quantum Mechanical Model - This is the current model of atomic structure which explains the existence of electron clouds and their discrete energy levels.

Plum Pudding Model - Was disproved by Rutherford's gold foil experiment.

Plum Pudding Model - Negatively-charged electrons randomly dispersed in a sea of positive charge.

Bohr Model - Sometimes referred to as the Planetary Model.

Bohr Model - The atom has a small positively-charged nucleus with negatively-charged electrons orbiting in different energy levels.

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C. Under these conditions, hydrogen / ethanol will release more energy in 1 second is the correct answer.

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Answer:

only the atoms present in the reactants can end up in the products.

Explanation:

Significant figures

0.0093: Leading zeros are never significant. This number has two significant figures, nine and three.

120.9: Nonzero numbers are significant and zeros between those numbers are significant, too. This number has four significant figures.

1.000: Trailing zeros are significant if there is a decimal point. This number has four significant figures.

1.008: Nonzero numbers are significant and zeros between those numbers are significant, too. This number has four significant figures.

670: Trailing zeros are not significant. This number does not have a decimal point. So, it has two significant figures.

0.184: Nonzero numbers are significant. This number has three significant figures.

1.30: Trailing zeros are significant if there is a decimal point. This number has three significant figures.