Answers
Answer:
3 option........
Explanation:
i think
Related Questions
pls help will give brainilest or however you spell it
Answers
Answer:
1. balanced
2. balanced
3. unbalanced
4. balanced
5. balanced
6. unbalanced
7. balanced
8. unbalanced
Explanation:
The diagram represents an atom of sodium combined chemically with one atom of chlorine to form a sodium chloride molecule. Sodium Chloride is an example of
Answers
Answer:
It is an example of ionic compound and ionic salt
Problem 1. What masses of 15% and 20% solutions are needed to prepare 200 g of 17% solution?
Problem 2. What masses of 18% and 5% solutions are needed to prepare 300 g of 7% solution?
Problem 3. 200 g of 15% and 350 g of 20% solutions were mixed. Calculate mass percentage of final solution.
Problem 4. 300 g of 15% solution and 35 g of solute were mixed. Calculate mass percentage of final solution.
Problem 5. 400 g of 25% solution and 150 g of water were mixed. Calculate mass percentage of final solution.
Answers
Problem 1:
we need 80 g of the 15% solution and 120 g of the 20% solution.
Let x be the mass of the 15% solution needed and y be the mass of the 20% solution needed.
x + y = 200 (total mass of the two solutions)
0.15x + 0.2y = 0.17(200) (total amount of solute in the two solutions)
Solving these equations, x = 80 g and y = 120 g.
Therefore, we need 80 g of the 15% solution and 120 g of the 20% solution.
Problem 2:
we need 120 g of the 18% solution and 180 g of the 5% solution.
Let x be the mass of the 18% solution needed and y be the mass of the 5% solution needed.
x + y = 300
0.18x + 0.05y = 0.07(300)
Solving these equations, x = 120 g and y = 180 g.
Therefore, we need 120 g of the 18% solution and 180 g of the 5% solution.
Problem 3:
The mass percentage of the final solution is 135 g/550 g × 100% = 24.55%.
The total mass of the final solution is 200 g + 350 g = 550 g.
The total amount of solute in the final solution is:
0.15(200 g) + 0.20(350 g) = 65 g + 70 g = 135 g.
Therefore, the mass percentage of the final solution is 135 g/550 g × 100% = 24.55%.
Problem 4:
The mass percentage of the final solution is 110 g/335 g × 100% = 32.84%.
The total mass of the final solution is 300 g + 35 g = 335 g.
The total amount of solute in the final solution is:
0.15(300 g) + 35 g = 75 g + 35 g = 110 g.
Therefore, the mass percentage of the final solution is 110 g/335 g × 100% = 32.84%.
Problem 5:
The mass percentage of the final solution is 18.18%.
Calculate the final mass of the solution:
Final mass = 400 g + 150 g = 550 g
Calculate the mass of solute in the 25% solution:
Mass of solute = 0.25 x 400 g = 100 g
Calculate the mass percentage of the final solution:
Mass percentage = (mass of solute ÷ final mass) x 100%
Mass percentage = (100 g ÷ 550 g) x 100%
Mass percentage = 18.18%
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Phương trình hóa học là gì
Answers
Explanation:
sự xuất bản hóa học nào? có một câu hỏi về khoa học mà bạn cần giúp đỡ? tôi luôn ở đây để giúp đỡ!
Which of the following items are made from renewable resources? Select the two correct answers. (1 point)
Responses
plastic fork
plastic fork
metal can
metal can
leather jacket
leather jacket
electronics
electronics
printer paper
Answers
A leather jacket and printer paper are examples of items that can be made from renewable resources, while plastic forks, metal cans, and electronics are not considered renewable due to their reliance on non-renewable materials and processes. Option C, E
The two correct answers that are made from renewable resources are:
C) Leather jacket: Leather is derived from animal hides, which are a byproduct of the meat industry. As long as there is a sustainable and responsible approach to animal farming, the production of leather can be considered renewable. The hides are obtained from animals that are raised for meat consumption, and their use in leather production helps reduce waste.
E) Printer paper: Printer paper can be made from various sources, including trees, bamboo, and recycled paper fibers. If the paper is sourced from sustainably managed forests or from fast-growing plants like bamboo, it can be considered renewable. Additionally, the use of recycled paper fibers reduces the demand for materials and promotes a more circular economy.
The other options, A) plastic fork, B) metal can, and D) electronics, are not made from renewable resources:
A) Plastic fork: Plastics are typically derived from fossil fuels, which are non-renewable resources. The production of plastic involves the extraction and processing of petroleum or natural gas, both of which are finite resources.
B) Metal can: Metal cans are predominantly made from aluminum or steel. While these metals can be recycled, their initial production requires the extraction of raw materials from the Earth, which is not a renewable process.
D) Electronics: Electronics are made from a wide range of materials, including metals, plastics, and various chemical compounds. The production of electronics involves the extraction of raw materials, many of which are non-renewable resources.
Option C and E.
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barrier islands are low and narrow sandy islands that form a rim offshore from a coastline. these islands protect inland shores from the surf,especially during storms. theses islands are becoming increasingly developed because people want to live by the open ocean, yet the island themselves are not permaneny. why aren't the islands permanent?
A. People developthe islands and remove sand during housing construction.
B. Offshore earthquakes cause the islands to sink below sea level.
C. The wind and the waves are constantly redistributing the sand.
D. Development companies mine the sand for use in inland construction projects.
Answers
Barrier islands are not permanent because the wind and the waves are constantly redistributing the sand.
What are barrier islands?Barrier islands are particularly flat or lumpy sand regions that are formed parallel to the mainland shore by wave and tide action. They typically appear in groups called chains, which can range in size from a few to more than a dozen islands.
They are called "barriers" because they act as a physical barrier, protecting the mainland from the effects of strong waves, storm surges, and flooding. Barrier islands are formed by a variety of processes, including longshore drift, sediment deposition, and sea level changes.
Barrier islands typically consist of sandy beaches on their seaward side and marshes, lagoons, or dunes on their landward side.
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How many H atoms are there in 0.510 moles of H
Answers
Answer:
No. of H atoms in 0.51 moles of H+ = 3.0713 * 10^23 atom
Explanation:
according to the definition of mole which states that the mole is the unit of amount of substance that equals Avogadro's number"Na = 6.022 * 10^23" (i.e. one mole of O2 contains 1Na of molecules, one mole of Ca = 1Na of atoms )
So
the number of atoms in 0.51 moles of H = 0.51 * 6.022 * 10^23 = 3.0713 * 10^23 atom
C11H24 how would you call is it decane or?
Answers
Wiring that is covered with orange conduit may contain wiring with voltage levels between 42 and 100 volts.
A) True
B) False
Answers
Wiring that is covered with orange conduit may contain wiring with voltage levels between 42 and 100 volts is true
Orange conduit is a type of protective covering that is used to enclose electrical wiring. It is often used to indicate that the wiring inside contains low-voltage circuits, which are those with voltage levels between 42 and 100 volts. Low-voltage wiring is used in a variety of applications, including lighting, security systems, and communications systems. It is typically safe to work with, but it is important to follow proper safety procedures and use appropriate tools and protective gear when handling it. Orange conduit is just one of several colors of conduit that are used to indicate the voltage level of the wiring inside. Other colors that may be used include yellow (for medium voltage), red (for high voltage), and black (for extra high voltage).
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What is the energy of a photon that has a wavelength corresponding to the peak in the figure which is 950 nm. Planck’s constant is h=6.626 x 10^-34 Jxs, and the speed of light is c=3.00 x 10^8 m/s.
Answers
The energy of a photon that has a wavelength of 950 nm is 1.89 × 10 ⁻¹⁶ kJ.
A photon is a primary particle that is a quantum of the electromagnetic area, such as electromagnetic radiation inclusive of light and radio waves, and the pressure carrier for the electromagnetic pressure. Photons are massless so they always move at the rate of light in a vacuum.
A photon is a tiny particle that comprises waves of electromagnetic radiation. As proven by Maxwell, photons are simply electric-powered fields journeying thru an area. Photons have no fee, no resting mass, and journey at the speed of mild.
calculation:-
E = hv
E = hc/λ
= 6.626 x 10⁻³⁴ × 3 × 10⁸ / 950 × 10⁻⁹
= 18884.1 × 10 ⁻¹⁷ J
= 1.89 × 10 ⁻¹³ J
= 1.89 × 10 ⁻¹⁶ kJ
Photons and electrons are the primary quantum-mechanical debris but they've completely distinctive residences. Photon is a form of fundamental particle which acts as a provider of energy, but the electron is a subatomic particle that takes place in all of the atoms.
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physical proceses? 2. (a). Calculate the maximum work done when the pressure of 10g of hydrogen is reduced from 20atm to 10atm at a constant temperature of 273°K. If the gas behaves ideally, will there be a change in internal energy? Hence determine the value of q in the process.
Answers
W = nRT ln(V2/V1)
where W is the work done, n is the number of moles of gas, R is the gas constant, T is the temperature in Kelvin, and V1 and V2 are the initial and final volumes of the gas.
First, we need to calculate the initial and final volumes of the gas using the ideal gas law:
PV = nRT
where P is the pressure, V is the volume, and n, R, and T are as defined above. Rearranging this equation to solve for V, we get:
V = (nRT)/P
Using this equation, we can calculate the initial volume of the gas:
V1 = (10 g H2 / 2.016 g/mol) * (0.0821 L·atm/mol·K) * (273 K) / (20 atm) = 11.9 L
And the final volume of the gas:
V2 = (10 g H2 / 2.016 g/mol) * (0.0821 L·atm/mol·K) * (273 K) / (10 atm) = 23.8 L
Now we can plug these values into the formula for work:
W = (10 g H2 / 2.016 g/mol) * (0.0821 L·atm/mol·K) * (273 K) * ln(23.8 L / 11.9 L) = 98.8 J
If the gas behaves ideally, there will be no change in internal energy because the temperature is constant (ΔU = 0). Therefore, the value of q in the process is equal to the negative of the work done:
q = -W = -98.8 J.
Hydrogen + Hydrogen.
Answers
The reaction of the hydrogen atoms is; H + H ---> H2.
What is the product of the reaction of two hydrogen atoms?We have to note that when we talk about a chemical reaction there is the combination of two substances so as to get a product out of it. In this case, we are having two atoms that are coming together.
In tis case, there are just two atoms of the hydrogen and they want to come together to form a compound. This is going to look something like saying that we have; H + H ---> H2.
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Use the periodic table to determine which of the following could be an isotope of bromine (Br). Check all that apply.
Z = 79, A = 196
Z = 35, A = 79
A = 79, N = 44
Z = 44, N = 44
Answers
The isotopes of bromine from the options would be Z = 35, A = 79.
What are isotopes?Isotopes are atoms of the same element with the same atomic number but different neutron numbers.
The atomic number of an atom is the number of protons present in the nucleus of the atom. Since elements are arranged according to their atomic number on the periodic table, isotopes of the same element will occupy the same position on the periodic table.
Now, considering the isotope of bromine (Br). The atomic number is 35. The atomic number is denoted as Z on the periodic table. The normal bromine atom has a mass number of 80. With 35 as the number of protons, the number of neutrons can be calculated as:
80 - 35 = 45.
Considering an atom with Z = 35, A = 79, means the atomic number is 35, which means it is a bromine atom. The mass number is 79 instead of 80.
79 - 35 = 44.
This means that the atom has 44 as the neutron number instead of 45. Thus, Z = 35, A = 79 is the only isotope of bromine.
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At 20C what is the molar mass of a gas with a denisty of 1.02g/L at 2.13atm
Answers
The molar mass of a gas with a density of 1.02 g/L at 2.13 atm and a temperature of 20°C is 47.9 g/mol.The molar mass of an element or compound is the mass of one mole of that substance. A mole is the SI unit for the amount of a substance.
It's defined as the amount of a substance that contains the same number of entities as there are atoms in 12 grams of carbon-12.Molar mass (M) = mass (m) ÷ amount of substance (n)So, M = m/n
Where m is the mass in grams and n is the number of moles. The unit of molar mass is grams per mole (g/mol).
The ideal gas law is used to calculate the molar mass of a gas. The ideal gas law is:P V = n R T,Where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.
Convert the density to grams per liter: 1.02 g/L.
The density is mass/volume, thus 1.02 g/L means that 1 liter of the gas weighs 1.02 g.
This means that 1 mole of gas will occupy 22.4 L (at standard temperature and pressure, STP).Calculate the number of moles of gas using PV = nRT.P = 2.13 atmV = 22.4 L (at STP)R = 0.0821 L·atm/K·molT = 273.15 K + 20 K = 293.15 K
Thus, n = PV/RT = (2.13 atm × 22.4 L)/(0.0821 L·atm/K·mol × 293.15 K) = 0.973 mol
Calculate the molar mass (M) using M = m/n.m = density × volume = 1.02 g/L × 22.4 L = 22.848 gM = m/n = 22.848 g/0.973 mol = 23.5 g/mol Convert to units of grams per mole: 23.5 g/mol
The molar mass of a gas with a density of 1.02 g/L at 2.13 atm and a temperature of 20°C is 47.9 g/mol.
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I WILL GIVE 35 POINTS TO THOSE WHO ANSWER THIS QUESTION RIGHT NOOOO SCAMS PLEASE
Answers
The molarity of the solution prepared by dissolving 0.355 moles of NH₃ in enough water to make 3.84 L of solution is 0.092 M
How do i determine the molarity of the solution?First, we shall list out the given parameters from the question. This is given below:
Number of mole of NH₃ = 0.355 moleVolume of solution = 3.84 LMolarity of solution = ?Molarity of a solution is defined as mole per unit volume i.e
Molarity of solution = mole / volume
Inputting the various parameters, we have:
Molarity of solution = 0.355 / 3.84
Molarity of solution = 0.092 M
Thus, from the above calculation, it is evident that the molarity of the solution is 0.092 M
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60 points!! Look at picture please don’t troll
Answers
2 Fe + O2 + 3 Fe2O3
What type of reaction is this.
Answers
Answer:
This is a synthesis reaction or a combination reaction
Several distinct changes take place in the body after a person dies; which one can tell us MOST about whether the corpse was moved?
1. rigor mortis
2. livor mortis
3. algor mortis
4. putrefaction
Answers
Answer:
2. Livor Mortis.
Explanation:
The tannish markings standing out from the red markings helps to show if they have been moved from where they orginially had been laying.
100mL of a solution that is simultaneously 15.6 mg/mL malonic acid, 3.38 mg/mL MnSO4 • H2O, and 0.03% starch
Calculate the g and mL necessary to make this solution
Answers
52.6g and 23.8mL necessary 100mL of a solution that is simultaneously 15.6 mg/mL malonic acid, 3.38 mg/mL MnSO4 • H2O, and 0.03% starch to make this solution.
What is malonic acid?
The chemical formula of malonic acid is CH2(COOH)2. Malonates include the ionized form of malonic acid as well as its esters and salts. Because it interferes with respiration, malonic acid is extremely harmful, especially in cases of cancer and other degenerative disorders (the making of ATP in mitochondria). Malonic acid is a somewhat unstable substance with limited practical uses. Beetroot contains its calcium salt, however the acid itself is often made by hydrolyzing diethyl malonate.
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5.0 g of Ag2CO3(aq) is reacted with excess KBr(aq) to produce 4.3 g of AgBr(s). What is the percent yield of AgBr in the reaction
Answers
The percentage yield of AgBr is 63.14%
We'll begin by writing the balanced equation for the reaction. This is given below:
Ag₂CO₃ + 2KBr —> 2AgBr + K₂CO₃Molar mass of Ag₂CO₃ = (2×108 ) + 12 + (3×16) = 276 g/mol
Mass of Ag₂CO₃ from the balanced equation = 1 × 276 = 276 g
Molar mass of AgBr = 108 + 80 = 188 g/mol
Mass of AgBr from the balanced equation = 2 × 188 = 376 g
From the balanced equation above,
276 g of Ag₂CO₃ reacted to produce 376 g of AgBr
Next, we shall determine the theoretical yield of AgBrFrom the balanced equation above,
276 g of Ag₂CO₃ reacted to produce 376 g of AgBr
Therefore,
5 g of Ag₂CO₃ will react to produce = (5 × 376) / 276 = 6.81 g of AgBr
Thus, the theoretical yield of AgBr is 6.81 g
Finally, we shall determine the percentage yield of AgBr.Actual yield of AgBr = 4.3 g
Theoretical yield of AgBr = 6.81 g
Percentage yield =?\(percentage \: yield \: = \frac{actual}{theoretical} \times 100 \\ \\ percentage \: yield \: = \frac{4.3}{6.81} \times 100 \\ \\ percentage \: yield \: = 63.14\%\)
Thus, the percentage yield of AgBr is 63.14%
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Which of the following statements is true?
All physical properties depend on how much material you have.
Some physical properties, like mass, volume, and density, depend on how much material you have.
The density of a material may differ as it changes state.
Changing the state of a material from solid to gas, for example, generally makes the material more dense.
Answers
Answer:
Es la tercera por qué cuando el material varía va cambiando de estado
Explanation:
Why do you think it rains more in west Ferris than in east Ferris
Answers
Answer:
This idea helps students explain why more rain forms over West Ferris than East Ferris. ... Therefore, when students explain that water vapor condenses higher in the atmosphere, they are actually explaining that water vapor condenses high in the troposphere, which is relatively low in the atmosphere.
Explanation:
This table lists plant adaptations and their functions.
Adaptation Function
flower aids in reproduction
bark ?
cuticle stops water loss
thorns stops predators
Which phrase correctly completes the chart?
A. stores seeds
B. provides protection
C. attracts pollinators
D. carries water
Answers
How much volume (in cm^3)is gained by a person who gains 11.8 lb of our fat? Human fat has a density of 0.918 g/cm^3
Answers
The volume (in cm³) gained by a person who gains 11.8 lb of fat is 5830.49 cm³
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
How to convert pounds to grams1 lb = 453.592 g
Therefore,
11.8 lb = 11.8 × 453.592
11.8 lb = 5352.3856 g
How to determine the volume Mass = 5352.3856 gDensity = 0.918 g/cm³Volume =?Volume = mass / density
Volume = 5352.3856 / 0.918
Volume = 5830.49 cm³
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Which compound has a functional group that contains two oxygen atoms?
Answers
The compound that has a functional group containing two oxygen atoms is peroxide. In addition to peroxides, there are other compounds that contain functional groups with two oxygen atoms. These include carboxylic acids and esters.
Peroxide compounds, such as hydrogen peroxide (H₂O₂) or organic peroxides, have a functional group (-O-O-) where two oxygen atoms are bonded together. This group is responsible for the characteristic properties and reactivity of peroxides.
Carboxylic acids: Carboxylic acids have the functional group -COOH, which consists of a carbonyl group (C=O) and a hydroxyl group (-OH) bonded to the same carbon atom. While carboxylic acids have one oxygen atom from the carbonyl group, the hydroxyl group provides the second oxygen atom.
Esters: Esters have the functional group -COO-, which consists of a carbonyl group (C=O) and an oxygen atom (-O-) bonded to the same carbon atom. This arrangement gives esters two oxygen atoms within their functional group.
Hence, the compounds with functional groups containing two oxygen atoms include peroxides, carboxylic acids, and esters.
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What do molarity and molality have in common?
Answers
Answer:
Both molarity and molality involves number of moles of solute
Explanation:
Molarity is obtained by dividing the number of moles of solute by the volume of solution in liters. Note that a solution is formed when a solute is dissolved in a given volume of solvent.
Molality, of a solution is obtained by dividing the number of moles of a solute by the number of kilogrammes of solvent.
In both cases, the number of moles of solute is involved. Hence, the number of moles of solute present is common to both molarity and molality calculation.
What is the percent of O in
Ca(С2H302)2?
(Ca = 40.08 g/mol, C = 12.01 g/mol,
H= 1.01 g/mol, O = 16.00 g/mol)
Answers
40.5%
Explanation:
Ca×1 = 40
C×4 = 48
H×6 = 6
O×4 = 64
64÷158×100% = 40.5%
Average Volume of A Drop. 15 Drops for 1 ML
Answers
Note that if the water volume (ML) in a graduated cylinder is 30.0 and the volume of a drop of water is 1.00 and the number of drops is 15, the average drop volume (ML) is 2.0 mL.
What is average drop volume?Average drop volume is a measurement of a droplet's average volume. It is employed in a wide range of applications, including laboratory experimentation, medical research, and medication delivery systems.
It aids in deciding the proper amount of liquid to utilize in a certain condition. It also aids in the creation of novel pharmaceuticals and assuring exact and constant dosing in medical treatments.
You may calculate the average drop volume by dividing the total amount of water (30.0 mL) by the number of drops (15). That is to say:
(30.0 mL divided by 15 drops = 2.0 mL/drop)
Hence where the number of drops is 15mL and the volume of one drop is 1.00mL, the average Volume of a Drop is 2.0mL
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Is HNO3 an acid or a base
I NEED HELP ASAP
Answers
Answer:
HNO3 is a potent acid, a base, a nitrating agent and a heavy oxidising agent at times. In the presence of a stronger acid, it serves as a base.
Explanation:
Answer:
It is a strong acid
Explanation:
please help!!
S + 6 HNO3 --> H₂SO4 + 6 NO₂ + 2H₂O
In the above equation how many moles of water can be made when 158.3 grams of HNO3 are
consumed?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer
as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark your
answer incorrect.:
Hydrogen 1
Nitrogen 14
Sulfur 32
Oxygen 16
Answers
Mole= mass/ Mr
158.3G/63=2.512698413
1 moles of 6 moles of HNO3 = 2.51… / 6 = 0.4187830688
2 moles of water= 0.4187830688 x 2 = 0.8375661376
Answer to 1 d.p = 0.8 moles