3 components of an expressway are :
Acceleration Lane
Merging Area
Slow Lane
Safety design features of an expressway:
Safety elements on the freeways include lane separators and shoulders. Broad, clearly indicated lanes: Highway lanes are broad and feature distinct markings. The inside edge of paved shoulders often has elevated or grooved patterns called "rumble strips" that are typically found alongside major highways.
What are expressways designed for?
Instead of the current practice of every business or establishment connecting the main roadway, access restricted roads have a limited number of designated entry and exit points. Coming onto the main highway is done via segregated service roads.
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10.5 mL of an unknown solution are diluted to 80.0 mL. The concentration of the
new solution was determined to be 0.172 M. What was the molarity of the
unknown solution? (Report your answer to two places past the decimal point.
Moodle is looking for a number only, no units.)
The molarity of the unknown solution prior to dilution is calculated to be 1.31M.
How to calculate molarity?The molarity of a solution can be calculated using the following formula:
C1V1 = C2V2
Where;
C1 = initial molarityC2 = final molarityV1 = initial volumeV2 = final volume10.5 × C1 = 80 × 0.172
10.5C1 = 13.76
C1 = 13.76/10.5
C1 = 1.31M
Therefore, the molarity of the unknown solution prior to dilution is calculated to be 1.31M.
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What can be determined from looking at absorption spectra of a gas?
A. The elements the gas is composed of.
B. The level of radioactivity the gas has.
C. The half-life of the gas.
D. The amount of thermal energy the gas contains.
From the absorption spectra of a gas, we can see the amount of thermal energy the gas contains (option D).
What is the absorption spectra?The absorption spectra shows us the energy that is taken in by a gas. We know that when a gas is heated, it absorbs energy which shows up in its absorption spectra.
Thus, from the absorption spectra of a gas, we can see the amount of thermal energy the gas contains.
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What is the empirical formula of a compound containing 5.03 grams carbon, 0.42 grams hydrogen, and 44.5 grams chlorine?
a. c2h5ci
b. c2h2c1
c. chcia
d. chci
The empirical formula of the compound is CHCl₃.
Calculation:Given,
Mass of carbon = 5.03 g
Mass of hydrogen = 0.42 g
Mass of chlorine = 44.5 g
Molecular weight of carbon = 12 g
Molecular weight of hydrogen = 1 g
Molecular weight of chlorine = 35.4 g
First, calculate the moles of each element,
Moles = given mass/ molecular weight
Moles of carbon = 5.03/12 = 0.42
Moles of hydrogen = 0.42/1 = 0.42
Moles of chlorine = 44.5/ 35.4 = 1.26
Divide the moles of each element by the smallest number of moles,
0.42 mol of C/ 0.42 = 1 C
0.42 mol of H/ 0.42 = 1 H
1.26 mol of Cl/0.42 = 3 Cl
The ratio of elements is 1:1:3
Therefore the empirical formula of the compound will be CHCl₃.
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Answer:CHCl₃
Explanation:
7. What is the mole ratio of NH3 to N₂ in the balanced chemical equation below?
4NH3(g) + 6NO (g) → 5N2 (g) + 6H₂O (l)
A. 3:2
B. 4:5
C. 10:11
D. 1:1
8. What mass of glucose (C6H12O6) can be produced from a photosynthesis reaction that occurs using 10
moles of CO₂?
6CO₂ (g) + 6H₂O (1)→ C6H12O6 (aq) + 602 (g)
A 10 grams
B. 180 grams
C. 300 grams
D. 1,080 grams
9. During photosynthesis, how many moles of water (H₂O) are needed to produce 150 grams of glucose
(C6H12O6)?
A. 2 moles
B. 3 moles
C. 4 moles
D. 5 moles
10. During photosynthesis, how many grams of oxygen gas (0₂) are produced from 55 grams of carbon
dioxide gas (CO₂)?
A. 32 grams 0₂
B. 40 grams 0₂
C. 44 grams 0₂
D. 55 grams O₂
7) From the coefficients of the equation, the answer is 4:5.
8) From the coefficients of the equation, for every 6 moles of carbon dioxide consumed, 1 moleof glucose is consumed. This means that 1.66 moles of glucose is produced. Glucose has a formula mass of 180.16 g/.mol, so the answer is (1.66)(180.16), which is about 300 grams.
9) From the coefficients of the equation, we know that for every 6 moles of water consumed, 1 mole of glucose is consumed. Since we want 150 grams of glucose, and glucose has a formula mass of 180.16 g/mol, we want 150/180.16 = 0.83 mol of glucose. Thus, we need 0.83(6) moles of water, which is 5 moles to 1 sf.
10) From the coefficients of the equation, we know that for every 6 moles of carbon dioxide produced, 6 molds of oxygen are produced. Since carbon dioxide has a formula mass of 44.009 g/mol, 55 grams is about 1.25 moles. Thus, since oxygen has a formula mass of about 32 g/mol, the answer is 32(1.25), which is about 55 grams.
When you react 8.59 M acetic acid with 8.59 M ethanol, the equilibrium concentration of acetic acid is 3.20 M . What is the equilibrium concentration (M) of ethyl acetate
The equilibrium concentration of ethyl acetate will be 5.39 M.
Initially, 8.59 M acetic acid react with 8.59 M ethanol.
acetic acid + ethanol ===> ethyl acetate + water
(8.59) (8.59) (0)
after some time, some change will happen.
acetic acid + ethanol ===> ethyl acetate + water
(8.59-x) (8.59-x) (x)
At equilibrium condition,
acetic acid + ethanol ===> ethyl acetate + water
(3.20) (3.20) (x)
At equilibrium, for acetic acid and ethanol to go from 8.59 to 3.20, the value of x must be 5.39.
Therefore, the equilibrium concentration of ethyl acetate will be 5.39 M.
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What are the three important functions of the atmosphere ?
The atmosphere protects life on earth by shielding it from incoming ultraviolet (UV) radiation, keeping the planet warm through insulation, and preventing extremes between day and night temperatures.
What is the atmosphere?An atmosphere is the layers of gases surrounding a planet or other celestial body.
The three important functions of the atmosphere are:
1. The atmosphere protects life on earth by preventing it from incoming ultraviolet (UV) radiation.
2. The atmosphere keeps the planet warm through the insulation effect.
3. The atmosphere maintains extremes between day and night temperatures.
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Effects to the nutrient cycle if the water cycle, oxygen cycle and carbon cycle are affected
What is the formula for Water?
The formula of water is H2O
Explanation:
The water molecule consists of two hydrogen atoms and one oxygen atom. So the chemical molecula formula of water is H2O where H is the symbol of hydrogen and O is the symbol of oxygen and 2 indicates that there are two atoms of hydrogen.
Hope this helps you!
Q:- Calculate the number of ions of the following compound:- 16g of H₂CO3
Answer:
= 1.553 x 10²³ ions
Explanation:
One mole of a compound or a substance consists of 6.02 x 10²³ ions. 6.02 x 10²³ is also referred to as Avogadro's number/constant.
From the above question, we have been asked to determine the number of ions in 16g of H₂CO3.
The relative formula mass (RFM) of H₂CO3 is 62.026 u:
Derived as;
H₂CO3 = (2 x 1.008) + (12.01 x 1) + (3 x 16.00) u
= 62.026 u.
Number of moles = Mass/RFM
[tex]moles \: = \frac{16}{62.026} \\ = 0.2579563 \\ = 0.2580 \: moles[/tex]
1 mole = 6.02 x 10²³ ions
0.2580 moles = ?
=
[tex] = \frac{0.2580 \times 6.02 \times 10 ^{23} }{1} \\ = 1.553 \times {10}^{23} \: ions[/tex]
Hence the number of ions in 16g H2CO3 = 1.553 x 10²³
Write the empirical formula for at least four ionic compounds that could be formed from the following ions:
The empirical formula of compounds formed from the given ions are as follows:
Pb⁴⁺ = PbO₂NH₄⁺ = NH₄ClCrO₄²⁻ = Na₂CrO₄SO₄²⁻ = K₂SO₄What is the empirical formula of a compound?The empirical formula of a compound is the simplest formula of the compound showing the simplest ratios in which elements in the compound combine.
The empirical formula of compounds formed from the given ions are as follows:
Pb⁴⁺ = PbO₂NH₄⁺ = NH₄ClCrO₄²⁻ = Na₂CrO₄SO₄²⁻ = K₂SO₄In conclusion, the empirical formula is the simplest formula of a compound.
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When aqueous solutions of sodium phosphate and lead(II) nitrate are combined, solid lead(II) phosphate and a solution of sodium nitrate are formed. The net ionic equation for this reaction is:
2 Na3PO4 (aq) + 3 Pb(NO3)2 (aq) --> 2 Pb3(PO4)2 (s) + 6 NaNO3 (aq)
The total ionic equation is
Spectator ions should not be removed here. Spectator ions are part of total ionic equation 6 Na+ (aq) + 2 PO43-(aq) + 3 Pb2+ (aq) + 6 NO3- (aq) --> 2 Pb3(PO4)2 (s) + 6 Na+ (aq) + 6 NO3- (aq)
Spectator ions should be removed now. Spectator ions are not part of total ionic equation
After removing Spectator ions, net ionic equation is:
3 Pb2+ (aq) + 2 PO43- (aq) -> 2 Pb3(PO4)2 (s)
Answer:
2+ 3 3 Pb (aq) + 2 PO4 (aq) -> 2 Pb3(PO4)2 (5)
Lead(II) nitrate,
Pb
(
NO
3
)
2
, and sodium bromide,
NaBr
, are soluble in an aqueous solution, which means that they dissociate completely to form cations and anions when dissolved in water.
Please check the attached file for brief answer.
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In the following neutralization reaction 2CsOH(aq) H2SO4(aq), the salt produced will be _______________
The salt produced by the neutralization of 2CsOH(aq) and H₂SO₄(aq) is Cesium Sulphate - Cs₂SO₄.
What is neutralization reaction?The neutralization reaction takes place between an acid and a base to produce a salt and water. The salt formed in the neutralization process is an ionic compound that consisting of an anion from the acid and a cation from the base.Neutralization reaction for the given compounds:The given compounds are
2CsOH - a strong base and H₂SO₄ - a strong acid
When they react with one another, the neutralization takes place and forms a neutral compound Cs₂SO₄ called as a salt.
The reaction is as follows:
2CsOH(aq) + H₂SO₄ → Cs₂SO₄ + H₂O
Therefore, the salt produced will be Cs₂SO₄(Cesium sulphate).
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How are the products represented in the chemical equation for photosynthesis? o2 6co2 c6h12o6 6h2o 6co2 6h2o c6h12o6 6o2
The chemical equation for photosynthesis is 6CO2+6H2O→C6H12O6+6O2. 6CO2+6H2O→C6H12O6+6O2.
In plants, the process of photosynthesis takes place in the mesophyll of the leaves, inside the chloroplasts.
Photosynthesis is the technique with the aid of which inexperienced plant life and positive other organisms remodel light electricity into chemical strength.
During photosynthesis in green flowers, mild strength is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-wealthy organic compounds.
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Answer:
The answer is actually:
D
Explanation:
What is the Volume of 1.1 moles of an ideal gas at a Temperature of 21 °C and a Pressure of 760 torr?
Answer:
26.5 L
Explanation:
To find the volume of the gas, you need to use the Ideal Gas Law. The equation looks like this:
PV = nRT
In this formula
-----> P = pressure (torr)
-----> V = volume (L)
-----> n = number of moles
-----> R = constant (62.36 L*torr/mol*K)
-----> T = temperature (K)
Before you can plug the given values into the equation, you need to convert Celsius (°C) to Kelvin (K). Then, you can solve for volume through simplification.
P = 760 torr R = 62.36 L*torr/mol*K
V = ? L T = 21 °C + 273.15 = 294.15 K
n = 1.1 moles
PV = nRT
(760 torr)V = (1.1 moles)(62.36 L*torr/mol*K)(294.15 K)
(760 torr)V = 20177.5134
V = 26.5 L
The enzyme carbonic anhydrase has zinc in a tetrahedral complex at its active site. Suggest a structural reason why car- bonic anhydrase synthesized with Ni2, Fe2, or Mn2 in place of Zn2 gives an enzyme with less catalytic efficiency
Answer:
Suggest a structural reason why carbonic anhydrase synthesized with Ni2+, Fe2+, or Mn2+ in place of Zn2+ gives an enzyme with less catalytic efficiency.
Which person has the most momentum?
A. A 50 kg person with a velocity of 3 m/s south
B. A 85 kg person that is stationary
O C. A 65 kg person with a velocity of 2.0 m/s east
D. A 65 kg person with a velocity of 2.5 m/s north
The most momentum is D. A 65 kg person with a velocity of 2.5 m/s north.
What momentum really means?Momentum can be defined as "mass in motion." All items have mass; so if an object is moving, then it has momentum - it has its mass in movement. The amount of momentum that an item has depends upon two variables: how a lot of stuff is moving and how fast the stuff is moving.
Momentum is the force that exists in a shifting object. The momentum pressure of a moving item is calculated by way of multiplying its mass (weight) via its velocity (pace). Surely put, a 20-lb. rock going at 10 mph has lots more momentum force than a 3-lb. Ball going at the same speed.
Momentum is the pressure that exists in a transferring item. The momentum pressure of a shifting object is calculated with the aid of multiplying its mass (weight) by way of its velocity (velocity). Simply put, a 20-lb. Rock going at 10 mph has lots more momentum pressure than a three-lb. Ball going at equal speed. They're each associated with an item's pace (or speed) and mass, but momentum is a vector quantity that describes the amount of mass in motion. Kinetic power is a measure of an item's energy from movement and is a scalar.
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how many formula units of CaCl2 are in 111 g CaCl2? the molar mass of calcium chloride is about 111 g/mol
There are 6.02 × 10²³ formula units of CaCl2 in 111 g CaCl2. Details about formula units can be found below.
What is a formula unit?Formula unit refers to the empirical formula of an ionic compound for use in stoichiometric calculations.
According to this question, there are 111g of CaCl2. The formula units can be calculated by multiplying the number of moles by Avogadro's number.
no of moles in CaCl2 = 111g ÷ 111g/mol = 1mol
Formula units of CaCl2 = 1mol × 6.02 × 10²³ = 6.02 × 10²³ formula units.
Therefore, there are 6.02 × 10²³ formula units of CaCl2 in 111 g CaCl2.
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An ionic bond for calcium and oxygen is cao. if an oxygen ion has a charge of two negative, what is the charge for calcium? 2 –1 1 –2
The charge on calcium in CaO is 2.
A bond between two atoms is formed by two ways: by complete transfer of electrons or by sharing of electrons. The bond formed by transfer of electrons is called an ionic bond while the bond formed by electrons sharing is called the covalent bond. There is on clear positive or negative charge on atoms in a molecules in case of covalent bond.
It is given that an ionic bond is formed between calcium and oxygen. The oxygen has -2 charge. This means that oxygen atoms has accepted two electrons from calcium. When an atoms donate electrons it acquires positive charge.
Ca gives two electrons to oxygen atom. Hence, the charge on calcium is +2. The correct option is 2.
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An unknown weak acid with a concentration of 0.072 M has a pH of 1.80. What is the Ka of the weak acid
The value of Ka of the weak acid is 4.47 x 10^-3.
The acids that do not dissociate completely in the aqueous solution and remains in equilibrium are called weak acids. The acid dissociation constant of the weak acid is represented as Ka.
Consider a weak acid HA. Its dissociation reaction will be:
HA -----> H+ + A-
I 0.072 0 0
C -x +x +x
E 0.072-x x x
Calculations:
pH = -log[H+]
1.80 = -log[H+]
[H+] = 0.01585 M
Hence, x = 0.01585 M
The value of Ka is calculated as:
Ka = x^2/0.072-x
= (0.01585)^2/(0.072 - 0.01585)
= 4.47 x 10^-3
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A student has a block that has volume of 150 cm3 and a density of 30 g/cm3.what is the mass of the block?
A.4,500g
B.0.2g
C. 5g
D.450 g
A block with a volume of 150 cm³ and a density of 30 g/cm³ has a mass of 4,500 g. The correct option is A.
What is density?Density is an intrinsic property of matter, equal to the quotient between the mass and the volume.
A student has a block with a volume (V) of 150 cm³ and a density (ρ) of 30 g/cm³. We can calculate its mass (m) using the definition of density.
ρ = m/V
m = ρ × V = 30 g/cm³ × 150 cm³ = 4,500 g
A block with a volume of 150 cm³ and a density of 30 g/cm³ has a mass of 4,500 g. The correct option is A.
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At 25 °C, what is the hydroxide ion concentration, [OH−] , in an aqueous solution with a hydrogen ion concentration of [H+]=4.8×10−4 M?
(oh-) =
[OH⁻]= 1 x 10⁻¹⁴ : 4.8 x 10⁻⁴ = 2.083 x 10⁻¹¹
Which situation would cause a red for an observer on the red planet?
was Velcro a mistake or purpose
Answer:
Velcro was an accident.
Explanation:
hope it helps
sry if im wrong
Answer:
it was a accident
Explanation:
Please help please help
Explanation:
in this question, we're asked how to determine whether we have a metallic or nonmetallic substance.So what you want to do is one to remember that metals are malleable and Nonmetal are brittle. So if we were to hammer the metal, it would be very malleable, but the nonmetal would fall apart. And never we could just hammer the sample and see whether it was malleable. And therefore it would be a medal or a brittle and therefore being nonmetal.
Elements 3 to 10 (Li to Ne) show a more or less steady increase in IE. What does this tell you about the energy level that each successive electron (from 3 to 10) is assigned to?
Elements 3 to 10 (Li to Ne) show a more or less steady increase in ionization energy.
What is ionisation energy?The amount of energy required to remove an electron from an isolated atom or molecule.
The major difference is the increasing number of protons in the nucleus as you go from lithium to neon. That causes greater attraction between the nucleus and the electrons and so increases the ionization energies. In fact the increasing nuclear charge also drags the outer electrons in closer to the nucleus.
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defination of dative covalent bond
In coordination chemistry,
A coordinate covalent bond also known as a dative bond, dipolar bond, or coordinate bond is a kind of two-center, two-electron covalent bond in which the two electrons derive from the same atom. The bonding of metal ions to ligands involves this kind of interaction.
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he naturally occurring form of a metal that is concentrated enough to allow economical recovery of the metal is known as Multiple Choice an element. a mineral. gangue.
The naturally occurring form of a metal that is concentrated enough to allow economical recovery of the metal is known as D)ores.
Ore is natural rock or sediment that consists of one or more valuable minerals, commonly containing metals, that can be mined, handled, and offered at a profit. Ore is extracted from the earth thru mining and treated or subtle, often via smelting, to extract the precious metals or minerals.
Ore is a deposit in Earth's crust of one or greater valuable minerals. The maximum valuable ore deposits include metals crucial to industry and alternate, like copper, gold, and iron. Copper ore is mined for ramification of industrial uses.
Ores are minerals that have a high awareness of a sure detail, commonly metallic. Examples are cinnabar (HgS), an ore of mercury, sphalerite (ZnS), an ore of zinc, cassiterite (SnO2), and an ore of tin (Mineral).
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How do you identify the components necessary for a combustion reaction?
The ways to identify the components necessary for a combustion reaction include:
Combustible substance.Ignition temperature. A gas which supports it.What is Combustion?This is referred to as burning and involves high-temperature exothermic redox chemical reaction.
This type of reaction involves the use of a gas such as oxygen which supports it and other flammable substances.
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A bicycle pump contains 250 mL of air at a pressure of 102 kPa. If the pump is
closed and the pressure increases to 2.25 atm, the new volume becomes
2.
Considering the Boyle's law, the new volume becomes 1,148,344.444 mL or 1148.34 L.
Boyle's lawBoyle's law relates pressure and volume, stating that the volume occupied by a given mass of gas at constant temperature is inversely proportional to pressure. This means that if the pressure increases, the volume decreases, while if the pressure decreases, the volume increases.
Boyle's law is expressed mathematically as:
P×V=k
Now it is possible to assume that you have a certain volume of gas V1 which is at a pressure P1 at the beginning of the experiment. If you vary the volume of gas to a new value V2, then the pressure will change to P2, and the following is true:
P1×V1=P2×V2
New volumeIn this case, you know:
P1= 102 kPa= 10335.1 atm (being 1 kPa= 101.325 atm)V1= 250 mLP2= 2.25 atmV2= ?Replacing in the Boyle's law:
10335.1 atm ×250 mL= 2.25 atm×V2
Solving:
(10335.1 atm ×250 mL)÷ 2.25 atm= V2
1,148,344.444 mL= 1148.34 L= V2
Finally, the new volume becomes 1,148,344.444 mL or 1148.34 L.
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Iron is found in Earth's crust as several iron compounds. Calculate the mass in kilograms of the amount of each of the following iron compounds that contains 8.0×10^3kg of iron
Fe2O3 (hematite)
Express your answer using two significant figures.
The mass of hematite that contains 8.0×10³ kg of iron is 2.29 × 10⁴ kg.
What are iron ores?Iron ores refers to minerals in which iron occur in combined form found in the earth's crust.
Some ores of iron include:
hematite,magnetite,limonite, and siderite.Molar mass of hematite, Fe₂O₃ = 160 g/mol
Molar mass iron = 56 g/mol
Percent mass of iron in hematite = 56/160 = 35%
The mass of hematite that contains 8.0×10³ kg of iron = 8.0 × 10³kg/0.35 = 2.29 × 10⁴ kg.
Therefore, the mass of hematite that contains 8.0×10³ kg of iron is 2.29 × 10⁴ kg.
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