Answer:
3.16mL of glacial acetic acid must be added
Explanation:
The mixture of acetic acid with sodium acetate produce a buffer. The buffer follows the H-H equation:
pH = pKa + log [A⁻] / [HA]
Where pH is the pH of the buffer: 5.0
pKa is pKa of the buffer = 4.74
[A⁻] could be taken as moles of acetate ion = 0.500L * (0.20mol/L) = 0.100mol
And [HA] are moles of acetic acid.
Replacing:
5.0 = 4.74 + log [0.100mol] / [HA]
0.26 = log [0.100mol] / [HA]
1.8197 = [0.100mol] / [HA]
[HA] = 0.100mol / 1.8197
[HA] = 0.05495 moles of acetic acid
As the glacial acetic acid is 17.4M, the volume we must add to prepare the buffer is:
0.05495 mol * (1L / 17.4mol) = 3.16x10⁻³L =
3.16mL of glacial acetic acid must be added
What is the value for the rate of constant, k(with units)?
Answer:
b
Explanation:
The diagram below shows part of the rock cycle.
Science, Middle school`
Which type of rock does C represent?
A. Igneous Rock
B. Rock formed by cooling
C. Rock formed by heat and pressure
D. Sedimentary Rock
I searched what each rock is called and looks like but I don't which on it is because they kinds all look the same.
Answer:
c
Explanation:
C represents C. Rock formed by heat and pressure.
What is a metamorphic rock?Metamorphic rocks are often squished, smeared out, and folded. regardless of those uncomfortable conditions, metamorphic rocks do not get warm sufficient to melt, or they would end up igneous rocks! common Metamorphic Rocks: common metamorphic rocks include phyllite, schist, gneiss, quartzite, and marble.
Metamorphic rock is any of a class of rocks that result from the alteration of preexisting rocks in reaction to changing environmental situations, such as variations in temperature, strain, and mechanical stress, and the addition or subtraction of chemical components.
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One mole (mol) of ethanol (C2H60) has a mass of 46.0684 g.
How many moles of ethanol are in an 18.0 g sample?
Need to see how the calculation was done.
Answer:
the number of moles of ethanol is 18 g sample is 0.390 mol
Explanation:
The computation of the number of moles of ethanol is 18 g sample is shown below:
= Mass of ethanol sample ÷ molar mass of ethanol
= 18 g ÷ 46.064=84 g
= 0.390 mol
Hence, the number of moles of ethanol is 18 g sample is 0.390 mol
Draw the bridged bromonium ion that is formed as an intermediate during the bromination of this alkene. Include hydrogen atoms, nonbonding electrons, and formal charge(s) in your structure. The starting alkene is a 4 carbon chain with a double bond between carbons 2 and 3. The substituents on the alkene are on opposite sides of the alkene. This reacts with B r 2 to give the intermediate ion.
Answer:
See explanation and image attached
Explanation:
The reaction of bromine molecule with an alkene passes through a bridged intermediate known as the brominium ion.
It is a cyclic intermediate that contains a positively charged bromine ion as i have shown in the image attached.
The brominium ion is first formed during the bromininaton of alkenes.
HELP PLS, ILL GIVE BRAINLIEST, 100 POINTSAbove is the word equation for photosynthesis. Respiration is another biochemical process that takes place within animals. The molecules involved in photosynthesis and respiration are water (H2O), carbon dioxide (CO2), oxygen (O2) and glucose (C6H12O6).
Select the equation below that best represent the process of photosynthesis.
Select one:
A.
B.
C.
D.
Answer:
C
Explanation:
Answer:
A.)
Explanation:
HELP!!!!!....... Iron oxide reacts with carbon monoxide to produce iron and carbon dioxide, with the balanced chemical equation Fe2O3 + 3CO —> 2Fe + 3CO2. What does this tell you about the relative amounts of iron oxide and iron consumed and produced in this equation?
A. For every two moles of iron oxide consumed, one mole of iron is produced,
B. For every two grams of iron oxide consumed, one gram of iron is produced.
C. For every gram of iron oxide consumed, two grams of iron are produced
D. For every mole of iron oxide consumed, two moles of iron are produced.
Answer:D
Explanation: There is one mole of Iron Oxide on the reactants side(left) and two moles of iron on the products side (right).
During burning, elements in the coal are
converted to compounds called ?
During burning, elements in the coal are converted to compounds called oxides.
An oxide is a compound formed by combination of an element with oxygen. Usually, when an element is burnt in oxygen, it combines with oxygen in the presence of heat to form oxides.
Coal contains carbon, nitrogen and sulfur. When coal is burnt, these elements combine with oxygen to form oxides. The products of combustion of coal are oxides of sulfur, oxides of carbon and oxides of nitrogen.
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What was the Copernican revolution?
Answer:
Explanation:
Copernicus proposed that the Earth is not the center of the solar system, and that the Sun is the center. It's called heliocentric. He wrote a book summarizing all his ideas called De Revolutionbus. The Copernican Revolution though, is when a majority of the people started taking his ideas seriously and a major shift happened in what people think about the solar system.
Answer:the discovery that the earth revolves around the sun
Explanation:
Perform each conversion
5.88 dL to liters
Answer:
5.88 dL = 0.588 litre
Explanation:
We need to find a conversion from 5.88 dL to liters.
We know that the conversion is as follows :
1 deciliter = 0.1 litre
To find 5.88 dL to liters, we use the unitary method. So,
5.88 dL= (0.1×5.88) litre
5.88 dL = 0.588 litre
So, there are 0.588 liters in 5.88 dL.
What type of element would form an ionic bond with iodine?
1. metalloid
2. solid
3. metal
4. nonmetal
Which of the following is an educated guess?
O Inference
O Observation
O Hypothesis
O Quantitative
Students pour some table salt into a beaker with distilled water to make a solution in order to test its conductivity. When they placed a conductivity probe in the salt water solution, it measured a high conductivity. The students repeated the same procedure with white sugar and measured no conductivity. Which of the following statements best explains why sugar is not conductive in solution?
Answer:
the answer is Covalent compounds separate into neutral molecules when they dissolve in water.
Explanation: covalent doesn’t conduct electricity in water
The common salt transforms the distilled water into an electrical conductor. But sugar molecule is a covalent compound which dissolve in water. So the white sugar does not show any conductivity.
What are conductors?The electrical conductors are defined as the materials which allow electricity to flow through them easily. The property of conductors which allow them to conduct electricity is defined as the conductivity. The metals are good conductors of electricity.
The distilled water does not contain any contaminants and it is incapable of conducting even very minute amount of electricity. But during the addition of ordinary salt or sodium chloride to the distilled water, it becomes electrically conductible.
The presence of chlorine and sodium ions makes the distilled water to conduct electricity. Here sugar is a covalent compound which separate into neutral molecules when they dissolve in water. So covalent compounds does not conduct electricity.
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1.24 moles of magnesium arsenate are dissolved in 1.74 kg of solution. Calculate the molality of the solution.
Answer:
Molality of the solution = 0.7294 M
Explanation:
Given:
Number of magnesium arsenate = 1.24 moles
Mass of solution = 1.74 kg
Find:
Molality of the solution
Computation:
Molality of the solution = Mole of solute / Mass of solution = 1.74 kg
Molality of the solution = 1.24 / 1.7
Molality of the solution = 0.7294 M
What’s the difference between nonrenewable and renewable energy sources? Is biomass a renewable energy source?
Answer:
Yes, biomass is a renewable energy source
Explanation:
Biomass—renewable energy from plants and animals
Nonrenewable energy resources, like coal, nuclear, oil, and natural gas, are available in limited supplies. Renewable resources are replenished naturally and over relatively short periods of time.
Answer:
Explanation:
Nonrenewable energy resources, like coal, nuclear, oil, and natural gas, are available in limited supplies while renewable resources are replenished naturally and over relatively short periods of time. Yes, Biomass is renewable organic material that comes from plants and animals.
Please help asap! Brainliest to correct answer.
What is the volume of 2.1 moles of nitrogen gas at standard temperature and pressure (STP)?
Select one:
a. 11 L
b. 22 L
c. 47 L
d. 82 L
Answer:
47 L will be the volume STP
Explanation:
In the Fischer esterification reaction, a carboxylic acid reacts with an excess of alcohol in acidic conditions to form an ester. During the reaction the sp2sp2 hybridized carbonyl carbon of the acid forms an sp3sp3 hybridized intermediate before returning to sp2sp2 hybridization in the product. Draw the structure of the neutral sp3sp3 hybridized intermediate and the ester product in the reaction between pentanoic acid and n‑propanol.
Answer:
See explanation and image attached
Explanation:
Esterification is a reaction of an alkanol and an alkanoic acid to yield an ester and water as products. It is analogous to inorganic neutralization reaction.
The process may be acid catalyzed. As mentioned in the question, the process of ester formation between pentanoic acid and n‑propanol first involves the carbonyl in going through an sp3 hybridized intermediate before returning to sp2 hybridized state in the product.
The image of the neutral form of this intermediate as well as the final structure of the ester are both shown in the image attached to this answer.
4.2g of cerium reacted with oxygen to form 5.16g of an oxide of cerium. Find
the simplest formula of this oxide*
ASAP plz
Answer:
CeO₂
Explanation:
Hello!
In this case, since we are given the mass of both cerium and the cerium oxide, we can first compute the moles of cerium and the moles of oxygen as shown below:
[tex]n_{Ce}=4.2gCe*\frac{1molCe}{140.12gCe}=0.03molCe\\[/tex]
[tex]m_O=5.16g-4.2g=0.96gO\\\\n_O=0.96g*\frac{1molO}{16.0gO} =0.06molO[/tex]
Now, we simply divide each moles by 0.03 as the fewest moles in the formula to obtain the simplest formula (empirical formula) of this oxide:
[tex]Ce=\frac{0.03}{0.03}=1\\\\O =\frac{0.06}{0.03}=2[/tex]
Thus, the formula turns out:
[tex]CeO_2[/tex]
Regards!
How can a ion become a anion ?
Answer:
Anions. Some atoms have nearly eight electrons in their valence shell and can gain additional valence electrons until they have an octet. When these atoms gain electrons, they acquire a negative charge because they now possess more electrons than protons. Negatively charged ions are called anions.
Explanation:
Can you give me brainliest?
The temperature in mark’s town is 30 degrees Fahrenheit. The temperature in Vikki’s town is 82 degrees Fahrenheit. In both towns, the relative humidity is 90 percent. Is the amount of water vapor in the air the same in both towns?
Answer:
sorry don't know the answer but i really need the points sorry
Explanation:
1. Making coffee or tea requires hot water to remove soluble components from the grounds or leaves. This is a separation process called extraction, removing a soluble component from solid material. What other separation technique is used to prepare the coffee or tea to drink
Answer:
The other technique which used to separate the coffee or tea is Filtration.
Filtration is a physical, biological or chemical operation that separates solid matter and fluid from a mixture with a filter medium that has a complex structure through which only the fluid can pass.
Solid particles that cannot pass through the filter medium are described as oversize and the fluid that passes through is called the filtrate.
What is a neuron..............
Answer:
Neurons are fundamental units of the brain and nervous system.the cells are responsible for receiving sensory input from the external world for sending motor commands to our muscles and for transforming and relaying electrical signals every step in between.
If AB = 5 inches and AD = 8, find BD. Round to the nearest tenth if necessary.
WILL GIVE BRAINLIEST
Answer:
6.5
Explanation:
half of 5 is 2.5, half of 8 is 4. 2.5+4=6.5
:)
Butane gas reacts with oxygen gas to give carbon dioxide gas and water vapor (gas). If you mix butane and oxygen in the correct stoichiometric ratio, and if the total pressure of the mixture is 392 mmHg, what is the pressure (in mmHg) of water vapor after the reaction has completed (temperature and volume do not change).
Answer:
118.776 mmHg
Explanation:
The equation of the reaction is;
C4H10(g) + 13/2 O2(g) ------> 4CO2(g) + 5H20(g)
Now the mole ratio according to the balanced reaction equation is;
1 : 6.5 : 4 : 5
Hence, the total number of moles present = 1 + 6.5 + 4 + 5 = 16.5 moles
Mole fraction of water vapour = 5/16.5 = 0.303
We also know that;
Partial pressure= mole fraction * total pressure
Partial pressure of H20(g) = 0.303 * 392 mmHg = 118.776 mmHg
The pressure (in mmHg) of water vapor is 118.78 mmHg
Balanced equation for the reaction
Butane reacts with oxygen according to the following equation
2C₄H₁₀ + 13O₂ —> 8CO₂ + 10H₂O
How to determine the mole fraction of water Mole of butane = 2 moles Mole of oxygen = 13 molesCarbon (IV) oxide = 8 moles Mole of water = 10 moles Total moles = 2 + 13 + 8 + 10 = 33 moles Mole fraction of water =?Mole fraction = mole / total mole
Mole fraction of water = 10 / 33
Mole fraction of water = 0.303
How to determine the partial pressure of waterMole fraction of water = 0.303Total pressure = 392 mmHgPartial pressure of water =?Partial pressure = mole fraction × total pressure
Partial pressure of water = 0.303 × 392
Partial pressure of water = 118.78 mmHg
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A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of pentane, ethanolamine, diethylamine, glycerol, and carbon tetrachloride. The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from his collection of Material Safety Data Sheets (MSDS), the chemist finds the following information: liquid density pentane 0.63gmL, ethanolamine 1.0gmL, diethylamine 0.71gmL, glycerol 1.3gmL, carbon tetrachloride 1.6gmL Next, the chemist measures the volume of the unknown liquid as 1737.cm3 and the mass of the unknown liquid as 1.23kg . Calculate the density of the liquid. Be sure your answer has the correct number of significant digits.
Answer:
0.71 g/mL
The liquid is diethylamine
Explanation:
Mass of the liquid = 1.23 kg of 1.23 * 10^3 g
Volume of the liquid = 1737.cm3
Let us remember that density is obtained as;
Density= mass/volume
Density= 1.23 * 10^3 g/1737cm^3
Density= 0.71 g/cm^3
Since we know that 1 mL=1 cm3 . So, 1 g/mL=1 g/cm3
So we can also write;
Density= 0.71 g/mL
The liquid is diethylamine
What is the mass of 4.5 moles of sodium fluoride?
why do Eastshore sculptures keep changing?
Answer:1. the junk sculpture rules say the forms have to change every two weeks or be taken clear down. 2. the weather and other people change the forms after they are built
Explanation:
Explanation:
1. The junk sculpture rules say the forms have to change every two weeks or be taken clear down.
2.The weather and other people change the forms after they are built.
I hope it's helpful!
Analyze Between visits 1 and 7, what kind of ecological succession is shown? Explain your answer.
Answer:
Is there supposed to be a picture??
Explanation:
This compound is treated with two different oxidizing reagents: either H2CrO4 and H2SO4, or with PCC. Draw the major organic product for each of the oxidation reactions. Do not draw inorganic by-products.
Answer:
See explanation and image attached
Explanation:
We were told that one of two different oxidizing agents were used H2CrO4 and H2SO4 or PCC/CH2Cl2.
Now, we must know that when we use H2CrO4 and H2SO4, primary alcohols are converted to aldehydes and then to carboxylic acids while secondary alcohols are converted to ketones.
When we use PCC/CH2Cl2 primary alcohols are converted to aldehydes and does not move further to convert to carboxylic acids while secondary alcohols are converted to ketones.
Recall that tertiary alcohols are not oxidized at all.
Take a close look at this diagram on the slide which form of government is represented by this diagram
Answer:
Confederation
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What's the pollen tube also known as
Answer:
The stigma.
Explanation:
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