Answer:
[tex]\small\color{black}\boxed{\colorbox{green}{√ Verified Answer}}[/tex]
A compound is defined as a pure substance that is made up of two or more elements in a fixed ratio by mass.
A molecule is the smallest part of an element or a compound that can exist independently.
is a compound called Calcium sulphide. It is formed by the chemical combination of calcium and sulphur . It represents one molecule of the compound. Each molecule of this solid contains one atom of calcium combined with one atom of sulphur.
..
86. Which electron configuration notation describes an
atom in an excited state?
A. [Ar]4s23d¹04p²
B. [Ne]3s23p5
C. [Kr]5s²4d¹
D. [Ar]4s²3d84p¹
Electron configuration notation describes an atom in an excited state as [Ar]4s²3d84p¹. Option D.
An electron is in an excited state when it temporarily occupies a higher energy state than its ground state. Electrons are excited when additional energy is supplied. When it absorbs a photon or packet of light or collides with a nearby atom or particle.
When an electron absorbs energy and shifts from a lower energy orbital to a higher energy atomic orbital the atom assumes an exciting electronic configuration. Usually an unstable electronic configuration. As a result, the electron returns to the ground state and releases a certain amount of energy. Ground state means the state with the lowest energy. When an electron absorbs energy and pops into an outer orbit, this state is called an excited state.
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Which one of the following gas samples occupies the largest volume at 745 mm Hg and 44 °C? EXPLAIN.
a) 16 g methane
b) 32 g oxygen
c) 38 g fluorine
d) they all occupy the same volume
From the calculations, we can see that the methane gas, oxygen gas and fluorine gas all have the same volume.
What is the largest volume?Now we know that we could be able to obtain the volume in each case by the use of the idea gas equation. We know that the temperature is 44 °C or 317 K and the pressure is 745 mm Hg or 0.98 atm.
Now;
For methane;
n = 16 g/16 g/mol = 1 mole
V = nRT/P
V = 1 * 0.082 * 317/0.98
= 26.5 L
For oxygen;
n = 32 g/32 g/mol = 1 mole
V = nRT/P
V = 1 * 0.082 * 317/0.98
= 26.5 L
For fluorine;
n = 38 g/38 g/mol = 1 mole
V = nRT/P
V = 1 * 0.082 * 317/0.98
= 26.5 L
Hence, they all occupy the same volume
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) Describe five mechanisms that promote aggregation in soils.
Answer:
wetting and drying
cultivation
freezing and thawing
particle size
Earthworm
Interpret the following equation for a chemical reaction using the coefficients given: N2(g) + 2 O2 (g) = 2 NO2 (g)
Interpretation of equation for a chemical reaction using the coefficients
On the particulate level: 1 molecule of N₂(g) reacts with 1 molecule of 2O₂(g) to form 2 molecules of NO₂(g).
On the molar level: 1 mole of N₂(g) reacts with 1 mole of 2O₂(g) to form 2 moles of NO₂(g).
What is a chemical reaction?chemical reaction: a process in which one or more substances—the reactants—are changed into one or more additional substances—the products. Chemical elements and compounds are both substances. To produce different substances as products, a chemical reaction rearranges the atoms that make up the reactants. Technology, culture, and life itself are all influenced by chemical reactions.
Numerous activities that involve chemical reactions have been known and used for thousands of years, including burning fuels, smelting iron, creating glass and pottery, brewing beer, and producing wine and cheese.
Numerous intricate processes that take place in all living systems, as well as the Earth's geology, atmosphere, and oceans, involve chemical reactions.
We have given the following chemical reactions
N₂(g) + 2O₂(g) → 2NO₂(g)
The changes in two levels, the particulate level and the molar level, can be interpret using the balanced equation.
On the particulate level, we always consider discrete molecules.
On the particulate level: 1 molecule of N₂(g) reacts with 1 molecule of 2O₂(g) to form 2 molecules of NO₂(g).
We think in terms of moles On the molar level, considering 1 mole of particles = 6.02 × 10²³ particles.
On the molar level: 1 mole of N₂(g) reacts with 1 mole of 2O₂(g) to form 2 moles of NO₂(g).
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Complete the balanced neutralization equation for the reaction below. Be
sure to include the proper phases for all species within the reaction.
HCl(aq) + Sr(OH)₂(aq) –
→
2 HCl(aq) + Sr(OH)₂(aq) → SrCl₂(aq) + 2 H₂O(l).
Complete neutralization occurs when strong acids such as hydrochloric acid and HCl are mixed with strong bases such as sodium hydroxide and NaOH. Strong acids and strong bases decompose or completely dissociate into their constituent ions when dissolved in water. When a strong acid reacts with a strong base, the resulting salt is neither acidic nor basic.
Neutral. For example, when HCl hydrochloric acid a strong acid reacts with NaOH a strong base the resulting salts are sodium chloride and water. In a neutralization reaction, an acid reacts with an equimolar amount of base to form salt and water. An example would be the reaction between a strong acid and a base. The sodium chloride formed is the result of the neutralization reaction.
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An unknown substance has a specific heat capacity of 2.22 J/g °C. If 92.3 grams are heated with 1,760.0 joules of energy, what will the change in temperature be?
An unknown substance has a specific heat capacity of 2.22 J/g °C. If 92.3 grams are heated with 1,760.0 joules of energy the change in temperature be will be 360°C
Specific heat is defined by the amount of heat needed to raise the temperature of 1 gram of a substance 1 degree celsius (°C)
Here given data is unknown substance
Specific heat capacity means Q = 2.22 J/g °C
Mass = 92.3 grams and
C = 1,760.0 joules and
We have to calculate change in temperature = ?
So the formula is Q = mc×ΔT
2.22 J/g °C = 92.3 ×1,760.0 joules×ΔT
ΔT = 360°C
So the change in temperature be360°C
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Please help with this question
Answer:
I am guessig B
Explanation:
Answer:bro
Explanation: you cant cheat on test
How many moles of N are in 0.179 g of N₂O?
0.008134 moles of N are in 0.179 g of N₂O.
1mole = 6.022 ×1023 number of moles of atoms or molecules or ions
Number of moles = Mass /molar mass
Number of moles of N2O = 0.179g/44.014g/mol = 0.004067mol
one mole of N2O contains two moles of N
Number of moles of N = 2× 0.004067 = 0.008134 moles.
What is mole fraction ?
The mole fraction can be calculated by dividing the number of moles of one factor in the reaction by the total number of moles of all impurities in the solution. It should be noted that the sum of the mole fractions of all components of the solution must be equal to one.
A mole fraction is a unit of attention. the relative amount of solute and solvent in the reaction is measured as a mole fraction and reported. Mole fraction is the wide range of moles of a given substance in solution divided by the total range of moles.
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C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(g)
Which type of reaction is this?
Answer: Combustion
Explanation:
Concentrated nitric acid, HNO3, is 16.0 mol dm–3. What volume would you need to prepare 100 cm3 of 0.50 mol dm–3 HNO3?
The question requires us to calculate the volume of concentrated HNO3 solution (concentration = 16.0 mol/dm^3) to prepare 100 cm^3 of a 0.50 mol/dm^3 HNO3 solution.
We need to calculate the volume necessary from a concentrated solution to prepare a more dilluted solution. The number of moles of HNO3 in the solutions will not change, thus we can say:
[tex]n_1=n_2[/tex]where n is the number of moles of HNO3 and 1 and 2 refers to the initial solution and final solution, respectively.
The number of moles in a solution can be calculated as it follows:
[tex]C=\frac{n}{V}\to n=C\times V[/tex]where C is the concentration and V is the volume of the solution.
We can combine these two equations to have the following expression:
[tex]n_1=n_2\to C_1\times V_1=C_2\times V_2[/tex]With this expression, we can use the values given by the question to calculated the volume of the concentrated solution (V1) necessary to prepare a more dilluted solution:
[tex]\begin{gathered} C_1\times V_1=C_2\times V_2\to(16.0\frac{mol}{dm^3})\times V_1=(0.50\frac{mol}{dm^3})\times(100cm^3) \\ V_1=\frac{(0.50\text{ mol/dm}^3)\times(100cm^3)}{(16.0\text{ mol/dm}^3)}=3.12cm^3 \end{gathered}[/tex]Therefore, the volume necessary of concentrated HNO3 to prepare 100 cm^3 of 0.50 mol/dm^3 HNO3 solution is 3.12 cm^3.
Why is it important for the body's different parts to be at specific pH levels?
Answer:
Our bodies live and die at a cellular level and the cells must maintain alkalinity in order to function and stay alive. An acidic state causes lack of oxygen at a cellular level. A pH of below 7.4 is sub-optimal providing the perfect environment for bacteria, mold and viruses to grow
Explanation:
Calculate how many grams of Fe2O3 (molar mass 159.70 g/mol) are formed when 16.7 g of Fr react completely with O2.4 Fe + 3 O2—> 2 Fe2O3
The first step to solve this question is to convert the given amount of grams of Fe to moles using its molecular weight.
[tex]16.7gFe\cdot\frac{mol}{55.845gFe}=0.3molFe[/tex]According to the given reaction, 4 moles of Fe produce 2 moles of Fe2O3. Use this ratio to find how many moles of Fe2O3 are formed:
[tex]0.3molFe\cdot\frac{2molFe_2O_3}{4molFe}=0.15molFe_2O_3[/tex]Convert this amount of moles to grams using Fe2O3 molar mass:
[tex]0.15molFe_2O_3\cdot\frac{159.70g}{molFe_2O_3}=23.9g[/tex]It means that 23.9 grams of Fe2O3 are formed.
how many molecules O2 has in 32 oxygen?
Answer:
One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1023 molecules of oxygen but 12.04 X 1023 (2 X 6.02 X 1023) atoms, because each molecule of oxygen contains two oxygen atoms.
Butane gas (C4H10) burns in oxygen gas to produce carbon dioxide gas and water vapor. Balance the equation for this reaction (in the lowest multiple integers).What are the formulas for the reactants and products?
The balanced chemical equation for the reaction between butane gas and oxygen gas is as follows: 2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O
What is combustion reaction?Combustion reaction is a process wherein a fuel is combined with oxygen, usually at high temperature, releasing heat.
According to this question, a combustion reaction occurs between butane gas and oxygen gas to form carbon dioxide and water vapor.
2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O
The formula of the reactants of this combustion reaction are as follows; C₄H₁₀ and O₂ while the formula of the products are as follows; CO₂ and H₂O.
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Classify each compound/molecule based on its ability to form a "Strong Electrolyte", "Weak Electrolyte", or "Nonelectrolyte" aqueous solution.
© (NH)2CO (Urea)
Urea is a nonelectrolyte.
What is a nonelectrolyte?A material that conducts electricity poorly and does not easily ionize when dissolved or melted.
Chemical substances that don't conduct electricity in any condition are called non-electrolytes. As a result, current does not flow through the solution since it does not add ions to it. Naphthalene, latex, and sugar solution are a few examples of covalent compounds that are not electrolytes. An object is an electrolyte if it is electrically conductive when it is liquid or dissolved. It is a nonelectrolyte if it does not conduct electricity while it is a liquid. In an aqueous solution, nonelectrolytes—such as sugar, alcohol, and many organic compounds—occur as uncharged molecules and do not conduct electrical current.
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Bart and Homer are building a mini nuclear reactor to put in the backyard (don't try this at home). They need rectangles of metal for their reactor casing. Bart and Homer each measure the perfect sized sheet of metal, but with different tape measures. Homer records 2.6m X 4.4m X 3.0m. Bart records 2.65m X 4.38m X 3.05m.
After taking sig figs into account, what will be the difference in their volume measurements in m3?
(Hint: remember you need to do the correct type of sig fig/rounding every time you hit the equal sign)
The difference is ______ m3
The difference in volume measured by Bart and Homer is equal to 1.08 m³.
What is the volume of the rectangular prism?The volume of a rectangular prism is calculated by multiplying the length, breadth, and height of the rectangle. A prism consists of 2 parallel rectangular bases and four rectangular faces.
It contains six flat rectangular faces and all the angles between faces are right-angled.
The volume of a rectangular prism = l × b × h
Where “b” is the base length “l” is the base width and “h” is the height of the rectangular prism.
If the nuclear reactor is made from a rectangular sheet then we can consider the metal sheet as a rectangular prism.
The Homer's volume of metal sheet = 2.6m × 4.4m × 3.0m = 34.32 m³
The Bart's volume of metal sheet = 2.65m × 4.38m × 3.05m = 35.40 m³
The difference between Bart's volume and Homer's volume is :
= 35.40 m³ - 34.32 m³
= 1.08 m³
Therefore, the difference between the volume of the metal sheet measured by Bert and Homer is 1.08m³.
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Why do you think the temperature does not change much during a phase change? If possible, discuss your answer with your classmates and teacher
There's no increase in the kinetic energies of the particles, and hence no rise in temperature, because the energy required for phase shifts is employed to break bonds.
Briefing :If the pressure around a solid, liquid, or gas stays constant throughout a phase shift, the temperature will not change. In other words, once a liquid hits its boiling point, the temperature won't rise any further until the entire volume of the liquid has transformed into a gas.
How temperature and energy during a phase change are correlated?As a solid transforms into a liquid during a phase change, its temperature stays constant because the heat energy is converted to potential energy. Similarly, when heat is supplied to a liquid, the temperature rises as the molecules once more move more quickly.
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Copper metal has a density of 8.96 G/cm^3. What volume (in cm) does a 26.0 g piece of Cu occupy?
The volume (in cm) does a 26.0 g piece of Cu is 2.90 cm³.
Density is the substance's mass in keeping with a unit of volume. The image most often used for density is ρ, despite the fact that the Latin letter D also can be used. Mathematically, density is defined as mass divided by volume.
Mass, extent, and density are three of an object's maximum simple residences. Mass is how heavy something is, quantity tells you how big it is, and density is mass divided through volume. although mass and extent are houses you deal with each day, the concept of density is a little much less obvious and takes a cautious idea.
The components for density are the mass of an object divided by means of its volume. In equation shape, it is d = m/v, in which d is the density, m is the mass and v is the volume of the object. the standard devices are kg/m³.
Density = mass / volume
Volume = mass/density
= 26/8.96
= 2.90 cm³
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Each copper(II) sulfate unit is associated with five water molecules in crystalline copper(II) sulfate pentahydrate
(CuSO4 ⋅ 5H2O). When this compound is heated in air above 100oC, it loses the water molecules and also its blue color:
CuSO4 ⋅ 5H2O → CuSO4 + 5H2O
If 9.60 g of CuSO4 are left after heating 15.01 g of the blue compound, calculate the number of moles of water originally
present in the compound.
Number of moles of water originally present in the compound is 0.060 mol
Mole is the SI unit of amount of substance of a specified elementary entity
Here given reaction is
CuSO₄ ⋅ 5H₂O → CuSO₄ + 5H₂O
And given data is CuSO₄ = 9.60 g
So we have to find number of mole of water originally present in the compound = ?
So number of mole = mass of substance/mass of one mole
Number of mole = 9.60 g/159.6
Number of mole = 0.060 mol
Water originally present in the compound is 0.060 mol
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Write a chemical equation for the reaction of CO2 and limewater (Ca(OH)2). Write a physical description of the products formed.
The balanced reaction equation between carbon dioxide and lime water is shown in the image attached to this answer.
What is a reaction?The term reaction has to do with the combination of two or more substances in order to yield new substance. Let us note that the substances on the left hand side are called the reactants while the substances on the right hand side are called the products.
In this case, we are trying to write an equation for the combination of carbon dioxide and lime water. We know that the product that is formed in this reaction is calcium carbonate.
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I need help with this!
Answer:
1. Fe: 26, 26, 30
2. Rh: 45, 45, 58
3. Sr: 38, 38, 50
4. Li: 3, 3, 4
5. Bi: 83, 83, 126
Explanation:
Protons = electrons = atomic number
Atomic mass - atomic number = neutron
when working in a contaminated chemical enviroment,which one of the following devices provides the most protection against vapors or fumes froma chemical ga
Answer: gas mask
Explanation: A gas mask provides optimal protection from vapor and fumes.
A pycnometer is a glass flask with a tight fitting glass stopper that can be used to determine the density of an insoluble solid by measuring the volume of water ejected out of the pycnometer when sample of the solid is placed in it. Determine the density in g/cm³ of an unknown metal alloy sample from the following measurements. Assume the density of water is 1.000 g/cm³.
Mass of clean pycnometer = 25.151 g
Mass of clean pycnometer plus water = 42.481 g
Mass of clean pycnometer plus metal sample = 39.605 g
Mass of clean pycnometer plus metal plus water = 54.265 g (after ejected water is dried from the outside surface)
The density in g/cm³ of an unknown metal alloy sample is 11.784g.
What does density mean?Mass per unit volume is the definition of density for a material. The ratio of mass to volume, or mass per unit volume, is what is meant by density. It gauges the amount of "stuff" contained within an object in relation to its volume (cubic meter or cubic centimeter). The degree to which matter is packed together firmly is fundamentally measured by density. The Greek scholar Archimedes is credited with discovering the principle of density. If you know the formula and are familiar with the relevant units, you can calculate the principle of density with ease. The formula for determining density is to take an object's mass (m) and divide it by its volume (v): = m / v. Density is typically denoted by the Greek symbol "."
The SI unit for density is the kilogram per cubic meter (kg/m3). centimeter (g/cm3).
Mass of clean pycnometer = 25.151 g
Mass of clean pycnometer plus water = 42.481 g
Mass of clean pycnometer plus metal sample = 39.605 g
Mass of clean pycnometer plus metal plus water = 54.265 g
54.265 g - 42.481 g
= 11.784 g
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In argon Fluoride laser used in some reflective eye surgeries of electro magnetic radiation at a wavelength of 193.3nm what is the frequency of the a A
RF lasers radiation what is the
energy of a single quantum of the radiation
In argon Fluoride laser used in some reflective eye surgeries of electro magnetic radiation at a wavelength of 193.3nm then the frequency is 1.72×10⁶Hz
Electromagnetic radiation is the is the form of energy that propagated both as electrical and magnetic waves traveling in packets of energy called photons
Here given data is
Wavelength = 193.3nm
Velocity = 3×10⁸m/sec
We have to find frequency = ?
Then the formula is V = λf
So rearrange this formula
f = V/ λ
f = 3×10⁸m/sec/193.3nm
f = 1.72×10⁶Hz
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Balance the equation KO2(s)+CO2(g)→K2CO3(s)+O2(g)
The balanced equation is
4 KO2(s) + 2 CO2(g) = 2 K2CO3(s) + 3 O2(g).
What is the are balanced equation?The law of conservation of mass states that the mass of the reactants and products of a chemical reaction should be equal. The amount of atoms for each element doesn't really increase as a consequence of the chemical reaction. Thus, the chemical equation illustrating the chemical process must be balanced. A chemical equation is said to be balanced when the number of atoms involved on the reactants and products sides are equal.
Here are the steps we need to do in order to balance an equation:
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If 100. mL of 0.400 M NaOH and 100, mL of 0.400 M HCI both initially at 24.5°C react in a calorimeter, the final temperature of the surrounding solution is 27.2°C. What is the enthalpy change of this chemical reaction (in Joules)? Assume the density of the solutions are the same as water. (be careful with your signs)
The negative sign indicators that the reaction is exothermic. the enthalpy change -2257.2 J.
Describe enthalpy.Enthalpy, one of a thermodynamic system's attributes, is determined by multiplying the system's internal energy by the sum of its pressure and volume. The large surrounding environment conveniently offers this state function, which is commonly utilized in measurements of chemical, biological, and physical systems at constant pressure.
In order to calculate the system's physical dimensions, the pressure-volume term specifies the effort required to displace the system's surrounds and make room for it. The pressure-volume term is quite tiny for solids and liquids under ordinary conditions, but only fairly modest for gases. Enthalpy therefore acts as a substitute for energy in chemical systems.
The equation for the reaction is NaOH + HCl [tex]\rightarrow[/tex] NaCl + H₂O
Volume of the solution (100+100) ml = 200ml
Mass of solution = 200ml soln. x 1.00gm/1ml soln. (water density 1g/ml)
= 200ml
We, know the rule q=mcp∆t can be used to calculate the enthalpy change
Where q = enthalpy change
m = mass of solution
c = Specific heat of solution
∆t = Change in temperature
∴ m = 200gm soln.
c = 4.18J/g°C (water specific heat)
∆t = (27.2°C - 24.5°C)
∴ q=mcp∆t
= 200gm x 4.18J/g°C x (27.2°C - 24.5°C)
= 2257.2 J
We known that
q reaction = - q solution
= (c x m x ∆t) soltuion
∴ q reaction = -2257.2 J
Therefore, the correct answer is -2257.2 J
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A weather balloon contains 14.0 L of helium at a pressure of 95.5 kPa and a temperature of 12.0°C. If this had been stored in a 1.50-L cylinder at 21.0°C, what must the pressure in the cylinder have been?
The pressure in the cylinder must have been 919.5 kPa.
What is the pressure in the cylinder?
The pressure in the cylinder is calculated by applying general gas equation as follows;
P₁V₁/T₁ = P₂V₂/T₂
where;
P₁ is the initial pressure of the cylinderT₁ is the initial temperature of the cylinderV₁ is the initial volume of the cylinderP₂ is the final pressure of the cylinderT₂ is the final temperature of the cylinderV₂ is the final volume of the cylinderP₂ = (P₁V₁T₂/T₁V₂)
The initial temperature of the cylinder = 12⁰C = 285 K
The final temperature of the cylinder = 21⁰C = 294 K
P₂ = (95.5 x 14 x 294/285 x 1.5)
P₂ = 919.5 kPa
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A weather balloon filled with helium has a volume of 125 ft³ at launch, where the temperature is 27 C. When the
balloon reaches an altitude of 45,000 meters where the temperature is -73C, its volume has increased to 94,000 ft³.
Assuming the atmospheric pressure was 755 mmHg at launch, what is the pressure (in mmHg) at 45,000 m?
The pressure (in mmHg) at 45,000 m, given it was 755 mmHg at launch is 0.669 mmHg
How to determine the pressure (in mmHg) at 45,000 mThe folloeing data were obtained from the question:
Initial volume (V₁) = 125 ft³Initial temperature (T₁) = 27 °C = 27 + 273 = 300 K Initial pressure (P₁) = 755 mmHgNew temperature (T₂) = -73 °C = -73 + 273 = 200 KNew volume (V₂) = 94000 ft³New pressure (P₂) = ?The new pressure of the gas at 45000 m can be obtained by using the combined gas equation as illustrated below:
P₁V₁ / T₁ = P₂V₂ / T₂
(755 × 125) / 300 = (P₂ × 94000) / 200
Cross multiply
P₂ × 94000 × 300 = 755 × 125 × 200
P₂ × 28200000 = 18875000
Divide both sides by 28200000
P₂ = 18875000 / 28200000
P₂ = 0.669 mmHg
From the calculation made above, we can conclude that the pressure at 45000 m is 0.669 mmHg
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Given the following reaction:
2 CH4O + 3 O2 → 2 CO2 + 4 H2O
How many grams of CO2 will be produced if you start with 1.34 g CH4O?
Please use the periodic table and remember to include your units.
Silver has a density of 10.49 g/cm³. If 101.0 g of silver is added to 51.0
mL of water in a graduated cylinder, to what volume reading will the
water level in the cylinder rise?
Density is the mass of a substance per unit volume. So, adding 9.628 ml of Ag to 51ml of H2O, makes the total volume 60.628ml.
What is meant by density ?
Density is the mass of a substance per unit volume. The most commonly used symbol for density is ρ, although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume: [tex]{\displaystyle \rho ={\frac {m}{V}}}[/tex] where ρ is density, m is mass and V is the volume.
Density is an important concept because it allows us to determine which substances float and which sink when placed in a liquid. In general, substances float until their density is lower than the density of the liquid in which they are placed.
Density = Mass/ water displaced
water displaced = Mass/Density
water displaced = 101 / 10.49
water displaced = 9.628 cm³
Here 1 cm³ = 1ml
so, adding 9.628 ml of Ag to 51ml of H2O, makes the total volume 60.628ml.
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