The student observed the solution before it wind put into the flame and realized it was similar in texture and colour to, the lithium chloride the teacher showed them. When they saw that both lithium chloride and the unknown produced a red flame, they were sure that the unknown must have been lithium chloride as well
What is chemical compound?A compound refers to a substance consisting of identical molecules composed of atoms of two or more chemical elements. That is called a chemical compound. A chemical compound means a chemical substance consisting of several similar molecules containing elements of several elements.
Most notably, these molecules are linked by chemical bonds. A chemical formula expresses the number of atoms of each element in a molecule of a compound. In addition, this chemical formula uses standard abbreviations for chemical elements with numerical signatures.
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a 0.175-l flask contains cl2 at 25 °c and 475 mm hg. what is the pressure of cl2 if the volume is increased to 0.800 l and the temperature increased to 55 °c?
Considering the Combined Law Equation, the pressure of Cl₂ if the volume is increased to 0.800 l and the temperature increased to 55 °C is 114.367 mmHg.
Boyle's lawBoyle's law states that the pressure of a gas in a closed container is inversely proportional to the volume of the container, when the temperature is constant: if the pressure increases, the volume decreases while if the pressure decreases, the volume increases.
Mathematically, this law is expressed as:
P×V= constant
Gay-Lussac's lawGay-Lussac's law states that the pressure of a gas is directly proportional to its temperature when the volume is constant: increasing temperature increases pressure, while decreasing temperature decreases pressure.
Mathematically, this law is expressed as:
P÷T= constant
Charles's law
Charles's law states that the volume is directly proportional to the temperature of the gas when the pressure is constant: if the temperature increases, the volume of the gas increases while if the temperature of the gas decreases, the volume decreases.
Mathematically, this law is expressed as:
V÷T= constant
Combined law equation
Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:
(P×V)÷T= constant
Considering an initial state 1 and a final state 2:
(P₁×V₁)÷ T₁= (P₂×V₂)÷ T₂
New pressure
In this case, you know:
P₁= 475 mmHgV₁= 0.175 LT₁= 25 °C= 298 K (being 0 °C= 273 K)P₂= ?V₂= 0.800 LT₂= 55 °C= 328 KReplacing in Combined law equation:
(475 mmHg× 0.175 L)÷ 298 K= (P₂× 0.800 L)÷ 328 K
Solving:
[(475 mmHg× 0.175 L)÷ 298 K] × (328 K÷ 0.800 L)= P₂
114.367 mmHg= P₂
Finally, the new pressure will be 114.367 mmHg.
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Write the molecular and empirical formulas of the following compound:
O-H
|
O-P-0-H
O-H
Answer:
the answer base on my test is H3O4P1
which one of the following would form a precipitate with po₄³⁻ ions in aqueous solution? a) k⁺ b) nh₄⁺ c) ca²⁺ d) none of these would form a precipitate.
Which of the following factors can precipitate as po₄³⁻ ions in an aqueous solution: ca²⁺.
Precipitate: In chemistry, a stable substance occurs due to a chemical reaction that reduces the solubility of a solid or an exchange of reactions due to a change in temperature. In meteorology, precipitation is liquid or strong water falling from the sky (rain, snow, etc.). Fehling's solution is blue due to dissolved Cu2. When silver nitrate and sodium chloride are mixed with water, the silver chloride precipitates out of the solution as a heavy precipitate. In this situation, the precipitate is silver chloride.
A precipitate has a strong form in a chemical reaction that is unique to both reactants. This occurs when solutions containing ionic compounds combine to form insoluble products. Sediment identification can usually be addressed by reviewing solubility recommendations. The correct answer is a homogeneous aggregate of two or more materials. A precipitate is a stable substance that separates from the solution as in a chemical reaction.
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Using your knowledge of the Brønsted-Lowry theory of acids and bases, write equations for the following acid-base reactions
a) HNO3 + OH-
b) CH3NH2 + H2O
c) OH- + HPO4-2
2) The compound NaOH is a base by the two of the theories we discussed in class. However, each of the ttwo theories describes what a base is in different terms. Use your knowledge of these ttwo theories to describe NaOH as an Arrhenius base, a Brønsted-Lowry base,
3) Write an equation for the reaction of potassium metal with hydrochloric acid.
4) Write the names for the following acids and bases:
a) KOH ____________________________________
b) H2¬Se ____________________________________
c) C2H3O2H ____________________________________
d) Fe(OH)2 ____________________________________
e) HCN ____________________________________
Using Bronsted - Lowry theory of acid and bases reaction :
a) HNO₃ + OH⁻ -----> NO₃ + H₂O
b) CH₃NH₂ + H₂O ------> CH₃NH₃⁺ + OH⁻
c) OH⁻ + HPO₄²⁻ ⇔ PO₄³⁻ + H₂O
2) NaOH is an Arrhenius base as it dissociates in water to give OH⁻ (hydroxide) and Na⁺ (sodium) ions.
NaOH is Bronsted Lowry base as it accepts H⁺ ion in the given reaction :
HCl + NaOH ---> H₂O + NaCl
3) potassium metal with hydrochloric acid:
2K + 2HCl ----> 2KCl + H₂
4)
a) KOH = potassium hydroxide is strong base
b) H₂Se = hydrogen selenide is acid
c) C₂H₃O₂H = acetic acid
d) Fe(OH)₂ = iron(II)hydroxide is base
e) HCN = hydrogen cyanide is weak base.
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In the first reaction of the citric acid cycle, oxaloacetate, which contains blank______ carbons, is combined with acetyl-coa, which contains blank______ carbons in its acetyl group, to produce citric acid, which contains blank______ carbons.
In the first reaction of the citric acid cycle, oxaloacetate, which contains 4 carbons, is combined with acetyl-coa, which contains 2 carbons in its acetyl group, to produce citric acid, which contains 6 carbons.
What is carbon?
Chemical element carbon has the atomic number six and the letter C assigned to it. It has a monovalent atom, which means that four of its electrons may be used to create covalent chemical connections. It is nonmetallic. The element table's group 14 includes it. The crust of the Earth contains barely 0.025 percent carbon.
Therefore,
In the first reaction of the citric acid cycle, oxaloacetate, which contains 4 carbons, is combined with acetyl-coa, which contains 2 carbons in its acetyl group, to produce citric acid, which contains 6 carbons.
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Once birth rate, death rate, emigration,
and immigration rates have been
determined, one can calculate the
A. population growth rate
B. survivorship rate
C. mortality rate
D. natality rate
Answer:
A. population growth rate
Explanation:
ignore C. and D., these aren't even related to geography. (oh and by the way, this isn't a chemistry question, it's a geography question)
B isn't the answer either because the question includes "immigration rates". this means that survivorship would only be about the people already inside an area, and forgetting about people who travel into it
Our atmosphere's density and pressure do this as you go up in altitude from the ground: question 1 options: density and pressure both decrease density decreases, pressure increases density increases, pressure decreases density and pressure both increase density and pressure both increase until you get to the stratosphere
Both atmosphere density and atmospheric pressure decrease with the increase in altitude.
Atmosphere density decreases as we go up in altitude because the composition of the atmosphere changes in favor of lighter gases, lowering the overall density of the mixture.
On the other hand, with the increase in altitude, the height of the column of air above us decreases, and that air also becomes less dense, resulting in lower atmospheric pressure at higher altitudes. One interesting consequence of this is that, for example, the boiling point of water decreases, so that at the top of Mount Everest, water boils at 68 °C.
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16. Give examples of at least three questions that we can use science to help answer.
Answer:
1.) Why is the sky blue?
2.) How far away from earth is the moon?
3.) How many different kinds of bacteria are on the main door handle at school?
Explanation:
Questions based on observations or on data from experiments are the ones that science can most likely help with.
I’ve has density of 0.92g/cm what will ice do in water
The unknown liquid must have a density that is lower than that of water since ice will only float in liquids that are less dense than water.
Briefing:For your information, ice has a density of 0.92 g/cm³ but water has a density of 1 g/cm³. Only liquids less dense than 0.92 g/cm³ will cause ice to sink. The unknown liquid must have a density that is lower than that of water since ice will only float in liquids that are less dense than water.
Why is ice low density?Other liquids have denser solid phases due to the tightly packed arrangement of molecules at lower temperatures. Although the water ice's hydrogen bonds are strong, their orientation causes molecules to push apart, which lowers density.
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if you gently shake a separatory funnel containing a carboxylic acid with chloroform and aq nahco3, the organic acid will be found where? (multiple answers possible)
If you gently shake a separatory funnel containing a carboxylic acid with chloroform and aq NaHCO3, the organic acid will be found in the top layer and the aqueous layer.
Here's the complete question:
If you gently shake a separatory funnel containing a carboxylic acid with chloroform and aq NaHCO3, the organic acid will be found where? (Multiple answers possible)
a) The top layer b) The bottom layer. c) The organic layer. d)The aqueous layer. e) As an insoluble solid.
Generally, Acid-base extractions are used in extracting Carboxylic acids from the organic layer to the aqueous and top layer by shaking them with a basic solution.
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How many total oxygen atoms are shown in the scenario below?
3CO₂ + H₂O
O a. 2
O b. 3
O c. 6
O d. 7
O e. 8
Answer:
d. 7
Explanation:
3CO2 => 3 x 2 => 6 atoms
H20 => 1 => 1 atoms
the mass of fe(s) produced when 1 faraday is used to reduce a solution of feso4 is 1.5 times the mass of fe(s) produced when 1 faraday is used to reduce a solution of fecl3.
Fe2+ requires 2 Faraday / mol Fe (s) or 1 Faraday → 1/ 2 mol Fe(s) Fe3+ require 3 Faraday / mol Fe (s) or 1 Faraday → 1/3 mol Fe (s) for equal numbers of Faraday (1/2 : 1/3 as 1.5 : 1) (Or inverse relationship is clear) no 2nd point unless flow of e¯ to mass (moles) is clear and logically correct
Is faraday unit of charge?The faraday is a dimensionless measure of the amount of electric charge, or roughly 6.02 × 10²³ electric charge carriers. This exists even referred to as Avogadro's constant and is equivalent to one mole. The coulomb (C) is the most popular unit for measuring the amount of electric charge in the International System of Units (SI).
Fe2+ requires 2 Faraday / mol Fe (s) or 1 Faraday → 1/ 2 mol Fe(s) Fe3+ require 3 Faraday / mol Fe (s) or 1 Faraday → 1/3 mol Fe (s) for equal numbers of Faraday (1/2 : 1/3 as 1.5 : 1) (Or inverse relationship is clear) no 2nd point unless flow of e¯ to mass (moles) is clear and logically correct
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The _____________________on Earth is constantly changing from one form to another in a ___________________________________that occurs over and over again.
The season on earth is constantly changing from one form to another in a cycle that occurs over and over again
Earth is the fragmental material composing part of the surface of the globe and earth's tilted axis causes the seasons throughout the year in different parts of earth receive the sun most direct rays so when the north pole tilts toward the sun it's summer in the northern hemisphere and when the south pole tilts toward the sun it's winter in the northern hemisphere
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Write the electron configuration for iron (Fe). Use spaces between each sub-shell. Write subscripts and superscripts as simple numbers. Do not use the abbreviated form. (Example: The electron configuration for Li would be written as 1s2 2s1)
The electron configuration for Fe with 26 electrons is:
1s²2s²2p⁶3s²3p⁶4s²3d⁶What is the electronic configuration of an element?The electronic configuration of an elemnet is the arrangement of electrons in electron orbits or energy levels around the nucleus of an atom of the element.
The electronic configuration shows the number of electrons that are found in an atom of the element.
The electrons in an atom are filled into orbitals.
The four orbitals to which electrons in an atom can be accommodated are:
s orbital - can contain a maximum of 2 electronsp orbital - can contain a maximum of 6 electronsd orbital - can contain a maximum of 10 electronsf orbital - can contain a maximum of 14 electronsLearn more about electronic configuration at: https://brainly.com/question/26084288
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whats the different between boyels gas law and Charles law
Calculate the number of moles that are present in 100g of SO₂. Show your work with units.
The number of moles SO₂ that are present in 100g of SO₂ 1.56 moles.
What is the formula for calculating the moles of a substance given the mass of the substance?The moles of a substance is related to the mass of the substance and the molar mass as follows:
mole = mass / molar massthe molar mass of a substance is the mass of 1 mole of the substance.
Molar mass of SO₂ = 32 + 16 * 2
Molar mass of SO₂ = 64
mass of SO₂ in the sample = 100 g
moles of SO₂ = 100 / 64
moles of SO₂ = 1.56 moles
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The number of unpaired electrons in a nitrogen atom is
Answer:
3
Explanation:
A nitrogen atom has 3 unpaired electrons
Why is water clear? What is the cause?
Answer:Water is entirely composed of hydrogen and oxygen Being composed of such elusive and invisible elements
Explanation:this is helped to be clear by oxygen and invisible elements like nutrients
a mixture contains n a h c o 3 together with unreactive components. a 1.62 g sample of the mixture reacts with h a to produce 0.561 g of c o 2 . the molar mass of n a h c o 3 is 84.01 g/mol and the molar mass of c o 2 is 44.01 g/mol . what is the percent by mass of n a h c o 3 in the original mixture?
The percent by mass of sodium bicarbonate in the sample mixture is 67%.
Sodium bicarbonate reacts with a monoprotic acid HA in the following manner:
[tex]NaHCO_{3} + HCl[/tex] → [tex]NaCl + H_{2}O+CO_{2}[/tex]
This means that 1 mole of sodium bicarbonate produces 1 mole of carbon dioxide. We can use this to set up a proportion:
84.01 g of sodium bicarbonate : 44.01 g of carbon dioxide = X : 0.561 g of carbon dioxde
X is equal to the mass of sodium bicarbonate in the sample.
X = 84.01 g * 0.561 g / 44.01 g = 1.08 g of sodium bicarbonate
The percent by mass is calculated using the following equation:
%w = 100% * mass of sodium bicarbonate / mass of mixture = 100% * 1.08 g / 1.62 g = 67%
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Why are valence electrons important?
A) They shield the other electrons from the nucleus.
B) They are mostly empty space.
C) They make up the bulk of the mass of the atom.
D) They participate in bonding.
What are the two gases that mix faster, and why?
Answer:
nitrogen and carbon because there diffusion rate is high
an irregularly shaped stone was lowered into a graduated cylinder that was holding 2.0 ml of water. the height of the water rose to 7.0ml. if the mass of the stone was 25g what was its density
According to the given statement if the mass of the stone was 25g was its density 5 g/cm³.
How is density defined in chemistry?Density is the ratio of a material's mass to its volume. The formula for density is d = M/V, where d denotes density, M is mass, and V is volume. Density is typically measured in grams per cubic centimeter.
What is a density unit?Despite the fact that the SI unit of density is kg/m3, we instead use g/cm3 for solids, g/ml for liquids, and g/L for gases out of convenience.
Briefing:Mass = 25 g
Volume = 7 mL – 2 mL
Volume = 5 mL
Volume = 5 cm³
Density = mass/volume
Density = 25 g/5 cm³
Density = 5 g/cm³
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how does the process of conduction, convection, and radiation work when heat transfer is involved with melting of polar ice caps?
Convection is a type of heat transfer in which a fluid experiences an energy transition. Radiation refers to the process by which heat is transferred between objects without direct physical contact.
How do conduction convection and radiation work together?Through the process of conduction, heat is transferred directly from one object to another. Convection is a type of heat transfer in which a fluid experiences an energy transition. Radiation refers to the process by which heat is transferred between objects without direct physical contact.
Direct contact between the objects is how heat is transferred during conduction. The heat is transferred within the fluid during convection. Heat transfer in radiation happens through electromagnetic waves without the use of particles. The temperature difference causes heat transfer to occur.
Conduction describes the process by which heat is transferred between objects when they come into direct contact.Convection is a type of heat transfer in which a fluid experiences an energy transition. It facilitates the passage of heat through fluids.Heat is helped to move through empty spaces by radiation.To learn more about conduction, convection, and radiation refer to:
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When these infected bacteria reproduce asexually, which genes would most likely be passed on?
Answer:
both the original and the new genes
Explanation:
what does a proton and neutron have in common
Answer:Both protons and neutrons have a mass of 1
Explanation:
Answer:
Protons and neutrons are both subatomic particles, which means they are both components of atoms. Protons and neutrons are found in the nucleus of an atom. They both have mass of 1 amu.
Explanation:
Which of the following provides the most evidence for the theory of plate tectonics?
Plate tectonics is supported by the distribution of fossils. The graphic depicts how four distinct fossilised species were distributed over three continents.
Which one supports the hypothesis of plate tectonics the most?How the plates originally fit together is shown by evidence from fossils, glaciers, and adjacent coasts. Plants and animals formerly lived there, and fossils show us when and where.
According to the idea of plate tectonics, the mantle is covered by a number of different plates that make up the Earth's crust. Compared to the mantle of the Earth, the plates behave like a solid, rigid shell. The lithosphere is this thick outer layer. Continental drift has been replaced by plate tectonics.
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When a trait is affected by a gene on
Either on the X or Y Chromosomes, which inheritance pattern is being described
The traits that are effected by the X or the Y chromosomes are s--ex linked.
What is the chromosome?
We know that animals are composed of cells. The cells have different parts that are contained in the cells and these parts of the cells are what we call the organelles of the cell. The organelles of the cell just helps the cell to perform its functions. The cell is the simplest unit of life that we have.
Now one of the organelles in the cell is the chromosome. This is the organelle that contains the gene. It gene is the unit of inheritance. Let us know that this unit of inheritance is passed from the parents to the offspring.
Let us then bear in mind that hen a trait is affected by a gene on either on the X or Y Chromosomes, which inheritance pattern is being described as s--ex linked.
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Need this quick to correct my chem quiz, will give brainliest!
ROUND the answer for each problem to the CORRECT number of significant figures.
A: (7.31 × 10^4) + (3.23 × 10^3)
B: (8.54 × 10^-3) - (3.41 × 10^-4)
C: 4.35 dm × 2.34 dm × 7.35 dm
D: 4.78 cm + 3.218 cm + 5.82 cm
E: 38,736 km ÷ 4,784 km
Answer:
A I did this and got an 100 eazy
If the frequency of a wave is 7.43 x 10¹4 Hz, is the wave in the visible light spectrum?
The frequency of a wave is V = 4.4 x [tex]10^{2}[/tex] [tex]s^{-1}[/tex].
The visible light spectrum is the part of the electromagnetic spectrum that can be seen by the human eye. This wavelength range is simply called visible light. Normally the human eye can see wavelengths between 380 and 700 nanometers. Visible light made up of the individual colors of the rainbow is only a small part of the electromagnetic spectrum. Another kind of light is radio waves.
The wavelength of light waves is approximately 400 to 700 nanometers 4,000 to 7,000 angstroms. Our eyes perceive different wavelengths of light as rainbow colors. Red light has a relatively long wavelength approximately 700 nm in length. Blue and violet light have short wavelengths of about 400 nm and the visible light spectrum is part of the spectrum of electromagnetic radiation visible to the human eye.
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( the subject is science)
PLEASE HELP ASAP!!!!!!
(2.05 HC)
During an investigation a scientist burned 48 g of magnesium strip. After the reaction the total mass of the product formed was found to be 80 g. Does the law of conservation of mass hold true in this case? Use complete sentences to justify your answer based on numerical calculations.
The law of conservation of mass hold true in this case.
Mass of magnesium = 48 g
Mass of product = 80 g
The law of conservation of mass states that mass cannot be created or destroyed, but can only be changed from one form to another. The total mass on both sides of the reaction (reactant side and product side) remains the same.Total mass of the reactants = Total mass of the products
The balanced chemical reaction for the burning of magnesium strip in air follows:
[tex]2Mg + O_2 \rightarrow 2MgO[/tex]
Mass of the reactants = Mass of Mg + mass of [tex]O_2[/tex]
Mass of the products = Mass of MgO
Putting values in the equation:
Mass of [tex]O_2[/tex] = 80 - 48 = 32g
The latent mass of the reactant is the mass of oxygen consumed. Thus, the formation of magnesium oxide follows laws when magnesium is burned.
What is Law of conservation of mass ?The law of conservation of mass, or the principle of conservation of mass, states that in any system that is closed to all matter and energy transfers, the mass of the system must remain unchanged over time, because the mass of the system cannot change. , so the amount cannot be increased or decreased. will be deleted. Therefore, the amount of mass is conserved over time.
The law means that mass cannot be created or destroyed, although it can be moved in space or its related entities transformed. For example, in chemical reactions, the mass of the chemical components before the reaction is equal to the mass of the components after the reaction. Thus, in all chemical reactions and low-energy thermodynamic processes in an isolated system, the total mass of the reactants or reactants must equal the mass of the products.
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