The atom get smaller when more particles are added as forces of attraction between protons and electrons increase.
The attraction between the nucleus and shell grows as we add additional protons and electrons, which causes the shell to shrink. The atom shrinks as a result. Your final and first-to-last paragraphs are attempting to mimic the behavior of electrons; the first cannot increase and should remain the same, while the second is contracting.
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at constant temperature, a sample of helium at 760. torr in a closed container was compressed from 5.00 l to 3.00 l. what was the new pressure exerted by the helium on its container? at constant temperature, a sample of helium at 760. torr in a closed container was compressed from 5.00 l to 3.00 l. what was the new pressure exerted by the helium on its container? 1 270 torr 800. torr 3 800 torr 2 280 torr 15.0 torr
At this point, helium is exerting 1270 torr of pressure against its container.
What is Boyle's Law?Boyle's Law, a cornerstone of chemistry, describes the behavior of a gas sustained at a constant temperature. Robert A. Boyle discovered this law in 1662: at a certain temperature, the volume of a gas is inversely proportional to the pressure it exerts. To put it another way, if a gas is driven into a closed place, it will condense to fit the area but raise the pressure on the container.
Boyle's law, which is arguably a clearer way to put it, is the relationship between pressure and volume. Mathematically, Boyle's law can be written as pV=k, where p stands for the pressure, volume, and mass of the gas and k is a constant.
The solution is straightforward when temperature and moles are constant,
P₁V₁ = P₂V₂
Given,
P₁ = 760 torr
P₂ = ?
V₁ = 5.00 I
V₂ = 3.00 I
(760)(5.00) = (3.00)(P₂),
P2 = 1270 torr.
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1)Give an example of a useful product that involves an endothermic reaction or process
2)Give an example of a useful product that involves an exothermic reaction or process
Answer:
1) endothermic reaction - melting of ice to water
2) exothermic reactions - burning of candles
Explanation:
Endothermic reaction:
endothermic reactions are chemical reactions that absorb heat from the environment.
In this case, when ice is melting to turn into water it absorbs heat from its surroundings and melts.
Exothermic reaction:
exothermic reactions are chemical reactions that release heat as a form of energy when a reaction takes place.
In the case of burning a candle, the heat is released into the environment.
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an ideal gas sample has a certain volume at 350 k and 1 atm. the volume of the same sample at stp will be closest to the volume at 350 k and 1 atm multiplied by:
0.78 m³ is the volume of the same sample at standard temperature and pressure(stp) will be closest to the volume at 350 k and 1 atm.
What is ideal gas?The ideal gas law (PV = nRT) explains how the macroscopic properties of ideal gases are connected. The particles in an ideal gas are those that: (a) do not interact with one another; and (b) take up no space (have no volume). The ideal gas law does provide a good approximation of real gas behavior in many circumstances, but no gas is truly ideal.
PV = (nRT)
Where;
P₁ = initial pressure = 1 atm
V₁ = initial volume = 1 m³
T₁ = initial temperature = 350 k
P₂ = final pressure = 1 atm
V₂ = final volume = ?
T₂ = final temperature = 273 k
P₁V₁ / T₁ = P₂V₂ / T₂
Solving for V₂;
V₂ = P₁V₁T₂ / P₂T₁
V₂ = 1 × 1 × 273/350
V₂ = 273/350 m³
V₂ = 0.78 m³
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Water is a polar solvent and carbon tetrachloride (CCl4) is a nonpolar solvent. In which solvent is each of the following more likely to be soluble?a. NaNO3, ionicb. I2, nonpolarc. sucrose (table sugar), polard. gasoline, nonpolare. vegetable oil, nonpolarf. benzene, nonpolarg. LiCl, ionich. Na2SO4, ionic
One of the first ten compounds, carbon tetrachloride, is used in a variety of industrial manufacturing processes as well as in consumer products such as paints, adhesives, degreasers, and other things.
How about a summary of carbon tetrachloride?An organic molecule called carbon tetrachloride is made up of a core carbon atom that is encircled by four chlorine atoms arranged in a tetrahedron. Because of its extremely low melting point, it is found as a colorless liquid at ambient temperature. It has a wide range of uses, including in cleaning supplies, fire extinguishers, and fumigants. It has been discovered that large amounts of it can have negative health effects.
A substance's solubility refers to its capacity to dissolve in a certain solvent. The fundamental solubility rule tells us whether a given item dissolves in
It is a clear liquid that has a faintly perceptible sweet odor. It is also known as benziform, perchloromethane, methane tetrachloride, carbon chloride, and methane tetrachloride. The most common way to encounter carbon tetrachloride is as a colorless gas in the air. Both its inflammability and ease of dissolution in water are nonexistent.
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based on a kckck c value of 0.200 and the given data table, what are the equilibrium concentrations of xyxy , xx , and yy , respectively?
The Equilibrium concentrations :
[XY] = 0.268 M
[X] = 0.232 M
[Y] = 0.232 M
Solution:
XY ⇔ X + Y
0.2 + x 0.3-x 0.3 - x
Kc = [X][Y]/[XY]
0.200 = (0.3-x)^2 / 0.2 + x
0.04 + 0.2 x = 0.09 + x^2 - 0.6 x
x^2 - 0.8 x + 0.05 = 0
x = 0.732 or x = 0.0683
Equilibrium concentrations :
[XY] = 0.268 M
[X] = 0.232 M
[Y] = 0.232 M
When both the reactants and products are at concentrations that do not change over time, they are said to be in chemical equilibrium. In this state, the forward reaction rate is equal to the reverse reaction rate. A chemical is said to have equilibrium concentrations when the products and reactants do not change with time.
In other words, chemical equilibrium or equilibrium concentration is the state in which the rate of the forward reaction in a chemical reaction equals the rate of the reverse reaction. Equilibrium is when the rate of the forward reaction equals the rate of the reverse reaction. All extract and product concentrations are constant at equilibrium.
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How many grams of water can be heated from 28.0°C to 74.5°C when 2.19 kJ of heat is absorbed?
Answer:
1.12 x 10⁻⁵ grams H₂O
Explanation:
To find the mass of water, you need to use the following equation:
Q = mcΔT
In this equation,
-----> Q = heat (J)
-----> m = mass (g)
-----> c = specific heat capacity (J/g°C)
-----> ΔT = T₂ - T₁ = change in temperature (°C)
"T₁" represents the initial temperature and "T₂" represents the final temperature. The specific heat capacity of water is 4.186 J/g°C. Before plugging the variables into the equation and solving for "m", you need to convert the energy from kilojoules (kJ) to joules (J).
1,000 kJ = 1 J
Q = 2.19 kJ / 1,000 = 0.00219 J c = 4.186 J/g°C
m = ? g ΔT = 74.5°C - 28.0°C = 46.5°C
Q = mcΔT <----- Given equation
0.00219 J = m(4.186 J/g°C)(46.5°C) <----- Insert variables
0.00219 J = m(194.649) <----- Multiply 4.186 and 46.5
1.12 x 10⁻⁵ = m <----- Divide both sides by 194.649
11.25 grams of water can be heated from 28.0°C to 74.5°C when 2.19 kJ of heat is absorbed.
What is Specific Heat?The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.
It is a measure of how much energy it takes to raise the temperature of a substance. It is the amount of heat necessary to raise one mass unit of that substance by one temperature unit.
It is given by the formula -
Q = mcΔT
where, Q = amount of heat
m = mass
c = specific heat
ΔT = Change in temperature
Given,
Amount of heat = 2.19kJ
Initial Temperature = 28
Final Temperature = 74.5
Q = mcΔT
2190 = m × 4.18 × ( 74.5 - 28 )
m = 11.25 g
Therefore, 11.25 grams of water can be heated from 28.0°C to 74.5°C when 2.19 kJ of heat is absorbed.
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Please help, I need the answer asap. Got a test on Monday!!
1. The bacterial cell shown is a prokaryotic cell.
2a. The similarities between prokaryotic and eukaryotic cells include:
they both have cell membranesthey both carry out the activities of lifethey both contain genetic material in the form of DNA2b. The differences between prokaryotic and eukaryotic cells include:
eukaryotic cells have membrane-bound organelles but prokaryotic cells do noteukaryotic cells have a membrane-bound nucleus but prokaryotic cells do notWhat are eukaryotic and prokaryotic cells?Eukaryotic cells are cells that possess a membrane-bound nucleus as well as membrane-bound cell organelles.
Eukaryotic cells are cells of higher organisms such as animals and plants.
Prokaryotic cells are cells that lack a membrane-bound nucleus as well as membrane-bound cell organelles.
Prokaryotic cells are cells of lower organisms such as bacteria.
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heat is transferred at a rate of 2 kw from a hot reservoir at 725 k to a cold reservoir at 300 k. calculate the rate at which the entropy of the two reservoirs changes. (round the final answer to six decimal places.) the rate at which the entropy of the two reservoirs changes is kw/k. is the second law satisfied?
the rate at which the entropy of the two reservoirs changes is 0.00390837931 kw/k .
What is entropy ?
Entropy, a measure of a system's thermal energy per unit temperature not available for useful work. Work is obtained from molecular motion, the amount of entropy is a measure of the molecular disorder or randomness of a system. The concept of entropy gives us deep insight into the direction of spontaneous change in many everyday phenomena. Introduced in 1850 by German physicist Rudolf Clausius, it is the pinnacle of 19th-century physics.
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A conclusion reached on the basis of evidence and reasoning is a(n)... A) conclusion B) hypothesis C) theory D) inference
Answer:
The answer is Inference.
40. Consider the following unbalanced equation.
FeCl₂ + Na₂CO3 → FeCO3 + NaCl
When the equation is completely balanced
using smallest whole numbers, the coefficient
of NaCl is
(1) 6 (2) 2
41. Consider the followi
(3) 3
(4) 4
Answer: 2
Explanation: For the equation to be balanced, the elements or compounds from the reactant and product sides must be equal.
Everything else was equal except the Na and Cl which on the reactant side it had 2 molecules each and on the product side 1 molecule.
All you have to do is add 2 Infront of NaCl on the product side to make the reaction balance.
Is using matches to light a candle physical or chemical change ?
Answer:
It's a chemical change.
Explanation:
The process of burning (as opposed to evaporating) is a chemical reaction, a chemical change. The wax molecules are undergoing a chemical change; they are changing into different molecules by reacting with a substance in the air.
when the amino acid glycine burns in a normal combustion reaction, the chemical equation is when this amino acid is burned by your body to obtain energy, the chemical equation is (enter your answer to three significant figures.) a question content area calculate the amount of heat produced when 8.76 g of glycine is burned in each reaction.
The normal combustion of 8.76 g of glycine produces 28.1 kcal while the combustion in the body produces 18.96 kcal.
What is the heat produced?We know that a combustion reaction is one in which an object is burnt in oxygen. In this case, we have the reaction in which the amino acid is burnt both in oxygen (normal combustion) and the burning of glycine in the body also occurs.
In this case, we have the number of moles of the glycine that has participated in the reaction is; 8.76 g/75 g/mol = 0.12 moles
In the reaction that occurs by normal combustion;
4 moles of glycine produces 936 kcal of energy
0.12 moles of glycine produces 0.12 moles * 936 kcal/4 moles
= 28.1 kcal
In the reaction that occurs in the body';
2 moles of glycine produces 316 kcal
0.12 moles of glycine produces 0.12 moles * 316 kcal/2 moles
= 18.96 kcal
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What is the empirical formula of a compound containing 60. 0% sulfur and 40. 0% oxygen by mass?.
You have a sample of an element. At room tempera-
ture, it is a lightweight, brittle solid with a metallic
luster. It has fair conductivity that increases with
increased temperature. Do you think the material is a
metal, nonmetal, or metalloid?
Explain
Sample of an element. At room temperature, it is a lightweight, brittle solid with a metallic luster. It has fair conductivity that increases with increased temperature the material is is metalloid
An element is the simplest form of matter that cannot be split into simpler substances or built from simpler substances by any ordinary chemical or physical method and element are further classified into metal, nonmetal and metalloid and metalloid are all solid at room temprature and it appear lustrous but is not malleable or ductile and it is much poorer conductor of heat than the metal and the material has properties of both metal and non metal that means the material is probably metalloid
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What volume of carbon dioxide (in L) will 3.32 g of antacid made of calcium carbonate produce at 37.0 °C and 1.00 atm in the stomach according to the following reaction?
CaCO₃ (s) + 2 HCl (aq) → CaCl₂ (aq) + H₂O (l) + CO₂ (g)
Using the ideal gas equation, the volume of the gas is 0.84 L.
What is the volume of the carbon dioxide gas?We know that an antacid does react with the acid in the stomach and that one of the products of the reaction is the carbon dioxide gas as we can see from the reaction equation; CaCO₃ (s) + 2 HCl (aq) → CaCl₂ (aq) + H₂O (l) + CO₂ (g).
If 1 mole antacid molecule produces one mole of carbon dioxide;
Number of moles of antacid = 3.32 g/100 g/mol = 0.0332 moles
Volume of the gas = ?
Number of moles of the gas = 0.0332 moles
Temperature of the gas = 37.0 °C + 273 = 310 K
Pressure of the gas = 1.00 atm
Given that;
PV = nRT
P = pressure
V = volume
n = Number of moles
R = gas constant
T = temperature
V= nRT/P
V = 0.0332 * 0.082 * 310/1.00 atm
V = 0.84/1
V = 0.84 L
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a mixture of 15.0 g of the anesthetic halothane (c2hbrclf3 197.4 g/mol) and 22.6 g of oxygen gas has a total pressure of 862 torr. what are the partial pressures of each gas?
C2HBrClF3 and O2 have partial pressures of 84 torr and 778 torr, respectively.
Given,
C2HBrClF3 mass = 15.0 g
O2 mass is 22.6 g.
C2HBrClF3's molar mass is 197.4 g/mole.
O2's molar mass is 32 g per mole.
Raoult's Rule
Xsolvent = Psolution
P0solvent
P solution is the solution's vapour pressure.
"solvent" is the solvent's mole fraction.
P0solvent = the pure solvent's vapour pressure
Raoult's Law-
Raoult's law states that the partial vapour pressure of a solvent in a solution (or mixture) is equal to or the same as the pure solvent's vapour pressure times the mole fraction of the solvent in the solution.
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Aa cup of coffee has a hydroxide ion concentration of 1. 0 × 10^−10 m. What is the ph of this coffee?.
Answer: 10
A cup of coffee has a hydroxide ion concentration of 1. 0 × 10−10 m. The pH of this coffee will be 10
pH = - log [H+]
= - log [1. 0 × ]
= - log 1 - ( -10 log 10 )
= 0 + 10 = 10
The pH of this coffee will be 10
Explanation:
Which examples are possible environmental impacts of flooding? Select the two correct answers. (1 point,
damage to homes
Reduction in tourism and Groundwater recharge are possible environmental impacts of flooding .
What are floods ?
During floods, people need to quickly move themselves and their most valuable possessions to higher ground. Leaving home in search of a safer place is called evacuation. Floods occur at irregular intervals and vary in magnitude, duration and areas affected.
Water flows naturally from high ground to low ground. This means that low-lying areas can flood quickly before they start reaching higher elevations. In rivers, flooding can occur, especially at bends and meanders in the channel, when flow exceeds the bed's capacity. Floods often damage homes and businesses when they are in the natural floodplains of rivers.
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the titration of an impure sample of khp found that 36.00 ml of 0.100 m naoh was required to react completely with 0.758 g of sample. what is the percentage (%) of khp in this sample
The titration of an impure sample of KHP found that 36.00 ml of 0.100 m NaOH was required to react completely with 0.758 g of sample. the percentage % of KHP in this sample is 96.9 %.
The equation for the reaction is :
KHP + NaOH -----> KNaP + H₂O
number of moles of NaOH = volume in L × molarity
= 0.0360 × 0.100
= 0.0036 mol
moles of KHP = moles of NaOH = 0.0036 mol
mass of KHP = molar mass × moles
= 204.2 × 0.0036
= 0.735 g
percentage of purity KHP =( mass of pure KHP / mass of impure ) × 100 %
= (0.735 / 0.758 ) × 100 %
= 96.9 %
Thus, The titration of an impure sample of KHP found that 36.00 ml of 0.100 m NaOH was required to react completely with 0.758 g of sample. the percentage % of KHP in this sample is 96.9 %.
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solid aluminum nitrate is added to distilled water to produce a solution in which the concentration of the nitrate ion, [no3-], is 0.60 m. what is the concentration of aluminum ion in this solution? (note: square brackets around a chemical formula indicates the molarity of that particular species)
The solid Aluminium Nitrate is added to distilled water to produce the solution, the concentration of Aluminium ions in the solution is 0.20 M
The Solid Aluminium Nitrate Al[NO₃]₃ consists of a ratio of 1 Aluminium ion consisting of 3 Nitrate ions per formula unit.
Thus, the concentration of [NO₃]³⁻ is given as 0.60M
1 [Al]³⁺ → 3[NO₃]
∴ 1 [Al]³⁺ → 1/3 × 0.60
1 [Al]³⁺ → 0.20 M
Hence, the concentration of aluminum ions in the solution is 0.20 M.
The Aluminium Nitrate appears to be a white, crystalline solid. Though it is a non-combustible compound but can accelerate the burning of combustible materials. In large quantities, it could lead to explosions.
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while performing the dumas experiment, if the outside of the flask were not completely dry (part i), how would this affect the calculated molar mass of the unknown volatile liquid? would it be higher or lower? explain.
Initially, the Flack is the flask filled with water and weighed to find may of water + flask Afla that the Flask is empty flack in noted. emptied and mars ofMass of water in the beaker. calculated by is mars of the flask from. subtracting from this volume of a mass of water + flask.
Flask is calculated using the standard density of water at that ten pleasure. If the flask is not a day from outside at that time, the mass of water will be More than the actual. This results. the higher calculated volume of the flask. As Molar mass. M- MRT PV mass of volatile where Mina's liquid.
Analysis of total nitrogen in organic matrices can be performed using the Dumas method. This ensures the complete combustion of the matrix under oxygen. The resulting gas is reduced with copper and dried with CO2 trapped. Next, quantify nitrogen using a universal detector. Use a thin glass flask with a long neck.
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11) the compound: a) is considered a d sugar. b) has 3 chiral carbons. c) is considered an aldose sugar d) all of the above are correct e) none of the above are correct
The compound: d) all of the above are correct ( considered a d sugar, has 3 chiral carbons, is considered an aldose )
As a general rule, chiral carbon centres are carbon atoms positioned at the four corners of a tetrahedron and attached to four distinct substituents. Steeogenic carbons and asymmetrical carbon atoms are other names for chiral carbon atoms. The definition of an aldose is a monosaccharide (simple sugar) with a carbon backbone chain, an aldehyde group on the carbon atom at the end, and hydroxyl groups connected to all of the other carbon atoms. Aldoses differ from ketoses, which are considered ketones because they have the carbonyl group away from the end of the molecule. The Lobry-de Bruyn-van Ekenstein transition can isomerize aldoses into ketoses.
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If the students replaced the rocket with one that has DOUBLE the MASS,
what would expect to see in the motion of the rocket?
Answer:
nothing common dude
of the following thermoplastics, the one most widely used for cable jackets is . select one: a. polyvinyl chloride b. polyethylene c. rubber d. crosslinked polyethylene
Polyvinyl chloride (PVC) is mostly used for cable jackets.
PVC cable jackets can withstand heat, sunlight, weathering, oils, acid, and physical abrasion, making them an excellent choice for outdoor cable jackets. It is a thermoplastic material.
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Initially, 0. 700 mol of A i preent in a 2. 50 L olution. 2A(aq)↽−−⇀2B(aq)C(aq) At equilibrium, 0. 200 mol of C i preent. Calculate K
Chemists employ the mole, a very significant unit of measurement. The initial SO3 concentration is 0.28 M.
Explain about the moles?A mole is defined as 6.02214076 1023 of a particular chemical unit, such as atoms, molecules, ions, or others. Because there are so many atoms, molecules, or other components in any compound, the mole is a useful quantity to utilize.
When an element's standard relative atomic mass is multiplied by the molar mass constant, 1 103 kg/mol = 1 g/mol, the result is the molar mass of its atoms.
An object's mass that comprises 6.023 x 1023 of that object's particles is referred to as a mole. The SI unit used to measure substance amounts is the mole. Molecule is its symbol. According to the definition, 1 mole of carbon-12 weighs 12 grams and has a carbon atom count of 6.022140857 x 1023.
2.50 L is the container's volume.
Initially, there were 0.700 moles.
first concentration of SO3 =0.700 moles /2.50 L
SO3 = 0.28 M
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what element uses the following quantum numbers:
n=2 l=1 ml=-1 ms=1/2
n=3, l=2 ml=-1, ms=-1/2
The elements that has the quantum numbers shown are;
n=2 l=1 ml=-1 ms=1/2 - Boronn=3, l=2 ml=-1, ms=-1/2 - ScandiumWhat is the quantum number?The quantum number is used to be able to identify the electron in an atom. We know that the orbital is a region in space where electrons could be fond and electrons are identified in the orbitals where they are found by the use of quantum numbers.
Now we have to use the quantum numbers as shown to be able to identify the elements that have them. This is so because the kind of element can be known from the quantum numbers that its electrons posses.
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a 30.0 g sample of water at a temperature of 280.0 k is mixed with 50.0 g of water at 330.0 k. what is the final temperature of the mixture (in kelvin) assuming that no heat is lost to the surroundings? (enter the numerical answer only; do not enter a unit.)
The final temperature after mixing these solutions will be 311K.
This can be calculated using formula:
q = m⋅c⋅(change in temperature)
−q (lost) = q (gained)
This is equivalent to
−50.0g⋅ (T−330)K = 30.0g⋅ (T-280)K
−50⋅T+16500 =30⋅T−8400
80.0⋅T = 24900
T = 311.25 K
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list five major parts of a long bone
The 5 major parts of the long bone are :
.The Proximal epiphysis
. The distal ephiphysis
.The compact bone
.The Diphysis
.The metaphysis.
What are long bones?
They are long, wide, and cylindrical in shape. They act as levers. e.gFemur, tibia, fibula, metatarsals, humerus, ulna, radius, metacarpals, and phalanges.
The five major parts of a long bone
.The Proximal epiphysis: This is made up of the spongy bone and articular cartilage.
.The distal epiphysis: This is enclosed by a membrane of connective tissue called the periosteum.
.The metaphysis: This is made up of an epiphyseal line and red bone marrow.
.The Diphysis: This is found in the medullary cavity which has an inner core of bone marrow. It contains nutrients and helps in the formation of cells, made up of yellow marrow in the adult and red marrow in the child.
.The compact bone: This is the outer shell of the long bone is made of cortical bone called compact bone.
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g the conversion of carbon dioxide to carbonic acid can be catalyzed by carbonic anhydrase with an activation energy of 85.6 kj mol-1 at 25c. by what factor will the rate constant increase if the temperature is raised to 37 c?
The rate constant increase by the factor of 4 when temperature is increased from 25C to 37C and activation energy is 85.6KJ. This can be solved using Arrhenius equation.
What is Arrhenius equation?
Arrhenius equation explains the relation between temperature and rate of the reaction for many chemical and physical reactions. It is given by,
k = A x e^(-Ea/RT)
where k = rate of the reaction, Ea = activation energy, R = gas constant, T = temperature.
The increase in the rate of the reaction can be calculated by Arrhenius reaction when the 2 different temperatures are given.
log k2/k1 = Ea / 2.303R [T2-T1 / T2T1] = 85.6 / 2.303 x 8.314 [ 310 - 298 / 310 x 298] = 4.
Therefore, by using Arrhenius equation, the increase in the rate of the reaction when the temperature increased from 25C to 37C is by a factor of 4.
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Which of the following statements is true regarding the Law of Conservation of
Matter?
Matter cannot be created or destroyed
Atoms are not lost or gained in a chemical reaction, but they can rearrange
The products and the reactants of a chemical reaction must have the same
number of atoms of every element
O
All of the above
