Answer:
A solution is another name for homogeneous mixture.
Explanation
Solution or homogeneous mixture are names for the classification of matter.
Matter is classified in 2 big groups: pure substances and mixtures.
Pure substances: are those that cannot be separated into more simple ones by physics methods, and are classified in compounds and elements.
Elements: these cannot be separated into more simple substances by chemical methods, e.g.: Au, Cu, Na, Cl, etc.Compounds: these are formed by two or more elements and can be separated into more simple substances by chemical methods, e.g: H₂O, CO₂, NaCl, etc.Mixtures: are those that can be separated into more simple ones by physics methods, and are classified in homogeneous and heterogeneous.
Homogeneous mixture (solution): has the same composition in the whole mixture and its components cannot be detected easily e.g: sugar dissolved in water.Heterogeneous mixture: has different compositions in the whole mixture and its components can be detected easily in different phases, e.g.: water and cooking oil.Write a balanced chemical equation for the reaction of acetone (c3h6o) with oxygen (o2) to form carbon dioxide (co2) and water (h2o). select one:
a. c3h6o + 4 o2 ® 3 co2 + 3 h2o.
b. 3 co2 + 3 h2o ® c3h6o + 4 o2.
c. 6 c3h6o + 8 o2 ® 6 co2 + 6 h2o.
d. c3h6o + o2 ® co2 + h2o.
The balanced chemical equation for the reaction of acetone (C3H6O) with oxygen (O2) to form carbon dioxide (CO2) and water (H2O) is C3H6O + 4 O2 → 3 CO2 + 3 H2O (option a). It preserves mass and element conservation.
The balanced chemical equation for the reaction of acetone (C3H6O) with oxygen (O2) to form carbon dioxide (CO2) and water (H2O) is:
a. C3H6O + 4 O2 → 3 CO2 + 3 H2O.
In this balanced equation, the number of carbon atoms, hydrogen atoms, and oxygen atoms on both sides is the same, ensuring that mass and element conservation are maintained.
Explanation:
- On the left side (reactants), there is one molecule of acetone (C3H6O) and four molecules of oxygen (O2).
- On the right side (products), there are three molecules of carbon dioxide (3 CO2) and three molecules of water (3 H2O).
This equation satisfies the law of conservation of mass and the law of conservation of elements because the number of each type of atom (carbon, hydrogen, and oxygen) remains the same on both sides of the equation. Option (a) is the correct balanced chemical equation for this reaction.
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If this reaction produced 19.6 g of kcl, how much o2 was produced (in grams)?
What type of change does electron have?
Choose the solvent below that would show the greatest freezing point lowering when used to make a 0.20 m nonelectrolyte solution.
The wittig reaction involves coupling between a phosphonium ylide and a carbonyl-containing molecule. if a chemist wants to use the wittig reaction to synthesize 2-methyl-2-pentene, which reactants should be used?
In the Wittig reaction to synthesize 2-methyl-2-pentene, a phosphonium ylide and a carbonyl-containing molecule, such as an aldehyde or a ketone, are needed as reactants.
Explanation:The reactants needed for the Wittig reaction to synthesize 2-methyl-2-pentene are a phosphonium ylide and a carbonyl-containing molecule. In this case, the carbonyl-containing molecule should be an aldehyde or a ketone. The phosphonium ylide is usually generated from a phosphine and an alkyl halide. For example, one possible combination of reactants could be triphenylphosphine and methyl iodide to form the phosphonium ylide, which can then react with an aldehyde or ketone to produce 2-methyl-2-pentene.
What is the pressure in atmospheres if 1360.0g of N2O gas is compressed in a 25.0L cylinder and is stored in an outdoor shed where the temperature can reach 59.0°C in the summer?
Final answer:
pressure of 34.19 atmospheres.
Explanation:
To find the pressure in atmospheres of 1360.0g of N2O gas compressed in a 25.0L cylinder at 59.0°C, use the Ideal Gas Law PV = nRT, where:
P is the pressure we want to find, V is the volume of the gas (25.0L),n is the number of moles of N2O,R is the ideal gas constant (0.0821 L·atm/K·mol),T is the temperature in Kelvin (59.0°C + 273.15 = 332.15 K).First, calculate the moles of N2O:
Molecular mass of N2O = (14.0×2) + 16.0 = 44.0g/mol
Moles of N2O = 1360.0g / 44.0g/mol = 30.91mol
Then, substitute the values into the Ideal Gas Law and solve for P:
P = (nRT)/V = (30.91mol × 0.0821 L·atm/K·mol × 332.15 K) / 25.0L = 34.19 atm
A carbon sink is a location that stores carbon for a long period of time. What are two carbon sinks that remove carbon from the atmosphere?
Plants, the ocean, and soil serve as the primary natural carbon sinks. A portion of the carbon dioxide that plants absorb from the environment to use in photosynthesis is transferred to the soil as plants disintegrate and die.
What is carbon sinks?Anything—natural or artificial—that gathers and stores a carbon-containing chemical compound over an extended period of time eliminates carbon dioxide from the atmosphere.
The ocean and vegetation are the two most significant carbon sinks on a global scale.
Typically, forests act as carbon sinks, absorbing more carbon than they emit. Through photosynthesis, they remove carbon from the atmosphere on a constant basis.
Another example of a carbon sink is the ocean, which takes in a lot of carbon dioxide from the atmosphere.
Therefore, the ocean, plants, and soil serve as the primary natural carbon sinks.
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Complete the sentence to explain when waves interact.
Waves interact with _____ and other _______ .
The answer is: Waves interact with objects and other waves.
There are many types of waves, with different energy and interactions witt.
In order from highest to lowest energy: gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves.
For example, ultraviolet wave is a type of electromagnetic radiation.
Ultraviolet has shorter waves and higher energy than violet, it lies between visible light and X-rays on the electromagnetic spectrum.
Ultraviolet radiation oscillates at rates between about 800 terahertz (THz) and 30000 THz.
To effectively stop both beta particles and gamma waves, scientists use a chamber composed of lead (Pb).
Answer:
objects and waves
Explanation:
The most stable conformation of 1,2-dibromoethane is:
how many molecules of h2o are equal to 97.2 g h2o
Answer:
3.25*10^24
Explanation:
What mass of phosphoric acid (h3po4, 98.0 g/mol) is produced from the reaction of 10.0 g of p4o10 (284 g/mol) with excess water?
Answer : The mass of phosphoric acid produced is 6.89 grams.
Solution : Given,
Mass of [tex]P_4O_{10}[/tex] = 10.0 g
Molar mass of [tex]P_4O_{10}[/tex] = 284 g/mole
Molar mass of [tex]H_3PO_4[/tex] = 98.0 g/mole
First we have to calculate the moles of [tex]P_4O_{10}[/tex].
[tex]\text{ Moles of }P_4O_{10}=\frac{\text{ Mass of }P_4O_{10}}{\text{ Molar mass of }P_4O_{10}}=\frac{10.0g}{284g/mole}=0.0352moles[/tex]
Now we have to calculate the moles of [tex]MgO[/tex]
The balanced chemical reaction is,
[tex]P_4O_{10}+6H_2O\rightarrow 4H_3PO_4[/tex]
From the reaction, we conclude that
As, 1 mole of [tex]P_4O_{10}[/tex] react to give 2 mole of [tex]H_3PO_4[/tex]
So, 0.0352 moles of [tex]P_4O_{10}[/tex] react to give [tex]0.0352\times 2=0.0704[/tex] moles of [tex]H_3PO_4[/tex]
Now we have to calculate the mass of [tex]H_3PO_4[/tex]
[tex]\text{ Mass of }H_3PO_4=\text{ Moles of }H_3PO_4\times \text{ Molar mass of }H_3PO_4[/tex]
[tex]\text{ Mass of }H_3PO_4=(0.0704moles)\times (98.0g/mole)=6.89g[/tex]
Therefore, the mass of phosphoric acid produced is 6.89 grams.
HELP!!!! 15 pts !!! Which chemical equation below does not illustrate the Law of Conservation of Mass? Al4C3 + 3H2O yields CH4 + 4Al(OH)3 2 NaCl + CaO yields Na2O + CaCl2 3 LiOH + Fe(NO3)3 yields 3LiNO3 + Fe(OH)3 Zn + 2HCl yields ZnCl2 + H2
I NEED HELP, HELP ME PLZ!!!
Match the element or group to the rule assigning its oxidation state.
(1.5 points) A. Oxygen B. Hydrogen C. Lone elements and atoms in gases D. Elements with multiple oxidation states E. Elements in groups 1, 2, and 17 and polyatomic ions
_____ 0
_____ Ionic charge
_____ +1, – 1 if bonded to a diatomic metal
_____ Almost always –2
_____ Determined by other elements in the compound
C. Lone elements and atoms in gases : 0
Elements in the free elemental have an oxidation number of zero
E. Elements in groups 1, 2, and 17 and polyatomic ions : Ionic charge
Group 1, 2, and 17 ions are formed by the alkali metals, alkaline metals and halogens respectively. Alkali metals, alkaline metals and halogens form +1, +2 and -1 ions respectively. Polyatiomic ions have -1, -2, -3 charges such as OH-, CO32-, PO43- respectively.
B. Hydrogen : +1, – 1 if bonded to a diatomic metal
H has an oxidation number of +1. H in metal hydrides such as NaH (sodium hydride) has an oxidation number of -1
A. Oxygen : Almost always –2
O has an oxidation number of -2.
D. Elements with multiple oxidation states : Determined by other elements in the compound
V (vanadium) has different oxidation which depends on the compound in which V is found.
look at the thing attached
select the one that most likely has the highest rate of effusion Oxygen (O2) or hydrogen (H2):
The answer is hydrogen (H2) because i just answered this question from Edgenuit.
What does it mean for a solution to be saturated
A. No more solute can be dissolved
B. The Concentration can be increased
C. No more solvent can be dissolved
D. The Solution can dissolve more substances
The identity of a carbonyl-containing compound has been narrowed down to three possibilities: acetamide (ethanamide), acetone (propanone), or 1,1,1-trichloropropanone. 1h nmr and ir spectral data for the compound are given below. determine the structure, and thus the identity, of the compound that gives the observed data.
Write a chemical equation depicting what happens to the salt in water.
Because the rock is irregularly shaped, you used the (______) method to measure its volume. A. Addition B. Direct C. Displacement
Answer:
Displacement
Explanation:
1. At approximately 50°C and 0.5 kPa, what phase of matter is water in? *
A. Solid
B. liquid
C. vapor
D. both liquid and vapor
2. A sample of neon occupies a volume of 375 mL at STP. What will be the volume of the neon if the pressure is reduced to 90.0 kPa? *
A.422 mL
B.422 L
C. 333 mL
D. 333 L
3. A gas at 155 kPa and standard temperature has an initial volume of 1.00 L. The pressure of the gas rises to 500 kPa as the temperature also rises to 135°C. What is the new volume? *
A. 2.16 L
B. 0.463 L
C. 0.207 L
D. 4.82 L
4. What pressure will be exerted by 0.650 mol of a gas at 30.0°C if it is contained in a 0.700 L vessel? *
A. 2340 kPa
B. 2340 atm
C. 231 kPa
D. 231 atm
5. The vapor pressure of water is *
a. high due to very weak intermolecular attractions
b. high due to water's polarity
c. low due to water's high specific heat
d. low due to relatively strong intermolecular attractions
6. Which mixture contains the largest particles? *
a. solution
b. suspension
c. colloid
d. emulsion
7. How does evaporation of a liquid differ from boiling a liquid?
8. Describe the Tyndall Effect and how it could affect my drive home on a foggy night.
The ka of benzoic acid is 6.4 x 10–5. what is the approximate ph of a 1.5 m solution of benzoic acid?
Answer: 2.01
Explanation:
[tex]C_6H_5COOH\rightleftharpoons C_6H_5COO^-+H^+[/tex]
initial : c 0 0
eqm: [tex]c(1-\alpha)[/tex] [tex]c\alpha[/tex] [tex]c\alpha[/tex]
[tex]K_a=\frac{c\alpha\times c\alpha}{c(1-\alpha)}[/tex]
when [tex]\alpha[/tex] is very very small the, the expression will be,
[tex]k_a=\frac{c^2\alpha^2}{c}=c\alpha^2\\\\\alpha=\sqrt{\frac{k_a}{c}}[/tex]
And,
[tex][H^+]=c\alpha[/tex]
Thus the expression will be,
[tex][H^+]=\sqrt{k_a\times c}[/tex]
Now put all the given values in this expression, we get
[tex][H^+]=\sqrt{(6.4\times 10^{-5})\times 1.5}[/tex]
[tex][H^+]=9.7\times 10^{-3}M[/tex]
[tex]pH=-log[H^+][/tex]
[tex]pH=-log[9.7\times 10^{-3}]=2.01[/tex]
The mole fraction of iodine, i2, dissolved in dichloromethane, ch2cl2, is 0.115. what is the molal concentration, m, of iodine in this solution?
Imagine a solution of two liquids that are so similar that their interactions together are the same as in the individual liquids. will this solution deviate positively from, deviate negatively from, or ideally follow raoult's law?
A tank of water contains many billions of water molecules. These molecules move at random speeds and in random directions, often colliding with each other. What form of energy does the water have due to the random motion of its particles?
thermal
radiant
chemical
potential
The energy due to the random motion of water molecules in a tank is thermal energy, which is related to the temperature of the water and can be transferred as heat.
The form of energy that water has due to the random motion of its molecules is called thermal energy. This energy arises from the kinetic energy that is present in the random microscopic motions of the water molecules. When these molecules move, collide, and bounce off each other, the average kinetic energy of these motions correlates with the temperature of the water. Furthermore, thermal energy can be transferred between objects or systems through processes like conduction, convection, and radiation, at which point it is commonly referred to as heat energy.
The concentrations of the products at equilibrium are [pcl3] = 0.180 m and [cl2] = 0.250 m. what is the concentration of the reactant, pcl5, at equilibrium?
The concentration of the reactant PCl5 at equilibrium can be found using the given equilibrium concentrations of the products and the equilibrium constant by rearranging the equilibrium expression and substituting the known values.
Explanation:To determine the concentration of the reactant PCl5 at equilibrium, we use the equilibrium constant Ke for the reaction, which is given as 0.0211. Let's set up the equilibrium expression for this decomposition reaction:
PCl5 → PCl3 + Cl2
The equilibrium constant expression is:
Ke = [PCl3][Cl2] / [PCl5]
We can rearrange this equation to solve for [PCl5]:
[PCl5] = [PCl3][Cl2] / Ke
We substitute the given concentrations [PCl3] = 0.180 M and [Cl2] = 0.250 M into the equation:
[PCl5] = (0.180 M)(0.250 M) / 0.0211
By calculating the above equation, we find the concentration of PCl5 at equilibrium.
Part a draw the major organic product formed when the compound shown below undergoes a reaction with an excess of etoh under acidic conditions.
Propanal undergoes nucleophilic addition with excess ethanol under acidic conditions, forming ethyl propanoate (ethyl propionate) and water through esterification.
Let's go into more detail about the reaction between propanal [tex](\(CH_3CH_2CHO\))[/tex] and ethanol [tex](\(EtOH\))[/tex] under acidic conditions.
1. Nucleophilic Addition of Ethanol:
- In the presence of an acid catalyst, such as sulfuric acid [tex](\(H_2SO_4\))[/tex], the carbonyl group of propanal undergoes nucleophilic addition with ethanol.
- The oxygen in the carbonyl group acts as a nucleophile attacking the partially positive carbon of the carbonyl carbon.
[tex]\[ \ce{CH3CH2CHO + EtOH} \xrightarrow{acid} \ce{CH3CH2COOCH2CH3} \][/tex]
2. Formation of Hemiacetal:
- Initially, a hemiacetal is formed, which involves the addition of one molecule of ethanol to the carbonyl group.
[tex]\[ \ce{CH3CH2CHO + EtOH} \xrightarrow{acid} \ce{CH3CH(OH)CH2COOCH2CH3} \][/tex]
3. Formation of Acetal (Ester):
- The hemiacetal formed can undergo another nucleophilic addition with a second molecule of ethanol, leading to the formation of the acetal (ester) and regeneration of the acid catalyst.
[tex]\[ \ce{CH3CH(OH)CH2COOCH2CH3} \xrightarrow{acid} \ce{CH3CH2COOCH2CH3 + H2O} \][/tex]
4. Overall Reaction:
- The overall reaction involves the addition of two molecules of ethanol to propanal, resulting in the formation of ethyl propanoate (ethyl propionate) and water.
[tex]\[ \ce{CH3CH2CHO + 2 EtOH} \xrightarrow{acid} \ce{CH3CH2COOCH2CH3 + H2O} \][/tex]
The ethyl propanoate formed is an ester, and this reaction is an example of an esterification reaction under acidic conditions. It's important to note that excess ethanol is used to drive the reaction to completion, and the acidic conditions help in the protonation and activation of the carbonyl group for nucleophilic attack by ethanol.
Complete Question
In which range of time do earthquakes occur? A. seconds B. days C. months D. millions of years
Differentiated animal cells and tissues include _____.
cuboidal cells
columnar cells
bone cells
fat cells
neurons
all of the above
How many grams of CaCl2 must be used to provide 0.252 moles of chloride ions?
To provide 0.252 moles of chloride ions, one would need 13.98428 grams of [tex]CaCl_2[/tex], using its molar mass of 110.98 g/mol and factoring in that each mole of [tex]CaCl_2[/tex] contains two moles of chloride ions.
To find out how many grams of calcium chloride ([tex]CaCl_2[/tex]) must be used to provide 0.252 moles of chloride ions, consider that each mole of [tex]CaCl_2[/tex] contains two moles of chloride ions. The molar mass of [tex]CaCl_2[/tex] is 110.98 g/mol.
To get the total number of moles of [tex]CaCl_2[/tex] needed, halve the number of chloride ions, which is [tex]\frac{0.252 moles}{2} = 0.126 moles[/tex] [tex]CaCl_2[/tex]. Then, use the molar mass to convert moles to grams:
0.126 moles [tex]CaCl_2[/tex] x 110.98 g/mol = 13.98428 grams of [tex]CaCl_2[/tex]
Therefore, you would need 13.98428 grams of [tex]CaCl_2[/tex] to provide 0.252 moles of chloride ions.
After you preform your experiment, you determine that the kf value for naphthalene is 6.91 °c/m . you are using 10g of naphthalene and added 1.0 g of your unknown. the the freezing point of the solvent decreased by 4.47 °c when the unknown was added. knowing this information, determine the molar mass of the unknown. g/mol
Based on the Kf value and mass of the solvent naphthalene, the molar mass of the unknown compound is 154.58 g/mol.
What is the molar mass of a substance?The molar mass of a substance is the mass of one mole of that substance.
The molar mass of a substance can be calculated from the Kf value and mass of the solvent naphthalene as follows:
mass of naphthalene = 10 g or 0.01 kg.
mass of unknown compound = 1.00 g
ΔT of the solution = 4,47 °C.
Kf value of naphthalene = 6.91°C/m;
Molar mass of unknown compound = Kf(naphthalene) × mass of unknown compound/ mass of naphthalene × ΔTMolar mass of the unknown compound = 6.91°C/m · 1 g ÷ 0.01 kg × 4,47°C.
Molar mass of the unknown compound = 154.58 g/mol.
Therefore, the molar mass of the unknown compound is 154.58 g/mol.
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