0.403 L is equal to
a. 4.03 mL
b. 40.3mL
c. 403 mL
d. 4,030 mL
Why do you cool down tea extract in ice to below 40°c before adding dichloromethane?
Identify what a bomb calorimeter measures. identify what a bomb calorimeter measures. measures δh for reduction solutions measures δe for combustion reactions measures δh for aqueous solutions measures δt for aqueous solutions measures δe for oxidation reactions
A bomb calorimeter is a device which is used to determine the change in enthalpy by measuring the change in temperature given the mass and heat capacity of the overall system by using the formula:
δh = m C (T2 – T1)
This is done by combusting the material in oxygen.
Hence the answer is:
measures δe for combustion reactions
A bomb calorimeter measures ΔE for combustion reactions. So correct option is B.
B) measures ΔE for combustion reactions.
A bomb calorimeter is a device used to measure the heat released or absorbed during a combustion reaction. It is a sealed container that is filled with oxygen and the reactants. The reaction is ignited, and the heat released is measured by the rise in temperature of the water surrounding the bomb.
The heat released in a combustion reaction is equal to the change in energy (ΔE) of the reaction. This is because the energy released is used to break the bonds in the reactants and form the bonds in the products. The heat released can be used to calculate the enthalpy change (ΔH) of the reaction, but only if the reaction is carried out at constant pressure.
Bomb calorimeters are used to measure the energy content of fuels, such as gasoline and coal. They are also used to measure the energy content of food.
The other options you have listed are incorrect. A bomb calorimeter does not measure ΔH for oxidation solutions, ΔH for hydrolysis solutions, ΔT for hydrolysis solutions, or ΔE for aqueous reactions.
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The complete question is:
Identify what a bomb calorimeter measures.
A) measures ΔH for reduction solutions
B) measures ΔE for combustion reactions
C) measures ΔH for aqueous solutions
D) measures ΔT for aqueous solutions
E) measures ΔE for oxidation reactions
plants that can live in water soaked soil are able to survive in the what ecosystem?
How is an emulsion different from a solution?
:The components are mixed unevenly instead of evenly within the emulsion.
:Insoluble instead of soluble particles are suspended within the emulsion.
:Two liquids that normally are not mixable are mixed in the emulsion.
:The components of an emulsion are single elements or compounds instead of a mixture of compounds.
The answer is
C) Two liquids that are not mixable are mixed in emulsion.
i did the test so its right
List at least two chemical reactions that resulted in a white precipitate. For these reactions list the possible chemical name of the precipitate. What do these reactions (and the others with white precipitates) have in common?
The molar mass of HgO is 216.59 g/mol. The molar mass of O2 is 32.00 g/mol. How many moles of HgO are needed to produce 250.0 g of O2?
Answer:
15.63
Explanation:
C on edg :) just did the test
The molar mass of HgO is 216.59 g/mol. The molar mass of O2 is 32.00 g/mol. 15.63 moles HgO are needed to produce 250.0 g of Oxygen.
What is molar mass ?The term molar mass is defined as a compound is the mass in grams of one mole of the compound. In a substance, the amount of entities present e.g., atoms, molecules, ions, is called as a mole. A mole of any substance is 6.022 × 10²³ molecules.
Given that;
Molar mass HgO = 216.59 g/mol
The molar mass of O2 = 32.00 g/mol
250.0 g of Oxygen
Required moles of HgO
The balanced chemical equation is as follows:
2HgO → 2Hg + O2
250g Oxygen (1 mole O2/32.00 g/mol O2)(2 moles HgO/1 mol O2)
= 15.63 moles HgO
Thus, The molar mass of HgO is 216.59 g/mol. The molar mass of O2 is 32.00 g/mol. 15.63 moles HgO are needed to produce 250.0 g of Oxygen.
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Light energy, 6H2O, and 6CO2 are at the start of photosynthesis.
True or False
What chemical change occurred in the following reaction?Mg2+(aq)+2OH−(aq)⟶ Mg(OH)2(s)
Answer: In this reaction, a precipitate is being formed.
Explanation:
A chemical change can be determined by the following indicators:
A characteristic odorColor changeFormation of bubblesFormation of precipitateEvolution of gasWhen magnesium ions and hydroxide ions react in aqueous state, it leads to the formation of a white colored solid of magnesium hydroxide.
In the above reaction, a precipitate is being formed and hence the reaction is considered as a precipitation reaction.
[tex]Mg^{2+}(aq.)+2OH^-(aq.)\rightarrow Mg(OH)_2(s)[/tex]
Therefore, in this reaction, the chemical change is that the precipitate is getting formed.
which best describes the motion of air particles when a sound wave passes through it
Will the solubility of borax in water increase, decrease or stay the same as the temperature increases
Answer:
solubility increases
Explanation:
What word or two-word phrase best describes the shape of the ammonia ( nh3 ) molecule?
Why is the second ionization energy greater than the first ionization energy? (1 Point)
A. It is more difficult to remove a second electron from an atom
B. The size of atoms increases down a group
C. The size of anions decreases across the period
D. The nuclear attraction from protons in the nucleus decreases
In case of the first ionization energy, the first electron is removed from a neutral atom; while in the second ionization energy the electron is removed from a positively charged ion which is found to be an electron deficient species.
Also when the second electron was removed the effective nuclear charge increases as compared to the first electron removal.
As a result there is a strong attraction between the nucleus and the outermost electron of the element. Therefore, the second ionization energy is observed to be higher than the first ionization energy of an element.
Calculate the theoretical mass of sodium carbonate solid that should be produced by heating 1.678 grams of sodium bicarbonate.
identify the state of matter with the lowest degree of freedom between the molecules
A. gas
B. Liquid
C. Plasma
D. Solid
A substance in a solid phase is relatively rigid, has a definite volume and shape.
The atoms or molecules that comprise a solid are packed close together and are not compressible.Because all solids have some thermal energy, its atoms do vibrate. However, this movement is very small and very rapid, and cannot be observed under ordinary conditions.the answer is d because Solid substances have the lowest degree of freedom and the highest attractive and intermolecular forces between the molecules.
is mixing food coloring with water a chemical or physical change?
Mixing food coloring with water is a physical change.
Physical changesPhysical changes are those that involve changes to the physical properties of materials without affecting the chemical properties.
When a food coloring is mixed with water, the water component of the mixture can be retrieved by evaporation and condensation while the food coloring will remain in the evaporating vessel.
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an ion of magnesium has 12 protons and a charge of +2. how many electrons are in this ions
An ion of magnesium has 12 protons and a charge of +2. The number of electrons in these ions are 12.
What are electrons?Electrons are negatively charged ions that are present around the nucleus of the atom. There are many electrons in one atom of the element. They revolve around the negatively charged nucleus.
Here, an ion of magnesium is given, that has 12 protons and a charge of 2+. To count the number of electrons, we can count the number of protons. The protons are equal to the number of electrons. Magnesium is an alkaline earth metal whose atomic number is 12.
Protons = electrons(12 electrons).
However, it has a charge of +2 which means it loses two electrons, thus, there are 10 electrons.
Thus, the number of electrons in these ions is 12.
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What mass of koh is needed to make 300.0 ml of 0.725 m koh? what mass of koh is needed to make 300.0 ml of 0.725 m koh? 86.4 g 30.5 g 23.3 g 12.2 g?
The given values in the problem are:
.725 M is moles per liter
300 mL = .300 L
The solution is:
56.1 g/mol in 300 ml = 56.1g/mol in .3L
M = (x gram/56.1) /.3L
.725 = (x gram/56.1)/.3L
Multiply both sides by .3
.2175 = x grams/56.1
x = 12.20 g
To make a 0.725mol solution with a volume of 300ml, you need approximately 12.2g of KOH, calculated using the definitions of molality and molar mass.
Explanation:To answer this question, we will use the definition of molality. Molality (m) is defined as the number of moles of solute per kilogram of solvent. It is given that the molality is 0.725m and the volume is 300.0 ml. Firstly, convert volume to mass. Since the density of water is approximately 1 g/ml, 300.0 ml is approximately 300.0 grams or 0.300 kg. Multiply this by the given molality, 0.725 mol/Kg, to obtain the number of moles of KOH, which is 0.2175 moles.
Now, we need to find the mass of KOH. The molar mass of KOH (K=39.1, O=16, H=1) is approximately 56.1g/mol. Multiply this by the number of moles (0.2175) and you obtain the mass of KOH required, approximately 12.2g.
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Determine the molar mass of an unknown monoprotic acid to two decimal places if 20.01 ml of a 0.098 m naoh solution were used to titrate 0.215 g of the unknown acid
The molar mass of the unknown monoprotic acid is calculated to be 109.63 g/mol by first determining the moles of NaOH used and then using the 1:1 mole ratio between the acid and base to find the moles and finally the molar mass of the acid.
In order to determine the molar mass of an unknown monoprotic acid using titration data, we need to first calculate the number of moles of base (NaOH) used in the titration. Given that 20.01 mL (or 0.02001 L) of a 0.098 M NaOH solution were used, we calculate the moles of NaOH:
moles of NaOH = volume (L) imes molarity (M) = 0.02001 L imes 0.098 M = 0.00196098 mol NaOH
Since the acid is monoprotic, it will donate one proton to the base, meaning the mole ratio of acid to base is 1:1. Thus, the moles of the unknown acid are also 0.00196098 mol.
To find the molar mass of the acid, we divide the mass of the acid by the moles:
Molar Mass = mass (g) / moles = 0.215 g / 0.00196098 mol = 109.63 g/mol (to two decimal places)
Which physical property is used to test the purity of a metal? A. hardness B. density C. viscosity D. malleability
it's density, because if you have a low carbon steel, which is not so dense, it's very pure due to the lack carbon content which increases the density. high carbon steel, which is used for guns, knives, swords, tools... etc... has a-lot of carbon content, which increases its density, because carbon is just really compact particles of decomposed matter, such as coal.
What is the mass of silver metal produced from 6.35 g of copper when copper reacts with excess silver nitrate in a single replacement reaction? ____ g?
The mass of silver metal produced when 6.35 g of copper reacts with excess silver nitrate is calculated to be 21.548 grams following a stoichiometric conversion process.
Explanation:To calculate the mass of silver metal produced from the given mass of copper, we need to reference the balanced chemical equation for the reaction between copper and silver nitrate:
Cu (s) + 2AgNO3 (aq) → Cu(NO3)2 (aq) + 2Ag (s)
From the equation, we see that each mole of copper produces two moles of silver. We can conduct a series of conversions to find the mass of silver using the molar masses of copper (63.546 g/mol) and silver (107.868 g/mol).
Firstly, calculate the number of moles of copper:
moles of Cu = mass of Cu / molar mass of Cu
= 6.35 g / 63.546 g/mol
= 0.0999 mol
Then, using the stoichiometry of the reaction, calculate the moles of silver produced:
moles of Ag = 2 × moles of Cu
= 2 × 0.0999 mol
= 0.1998 mol
Finally, convert the moles of silver to mass:
mass of Ag = moles of Ag × molar mass of Ag
= 0.1998 mol × 107.868 g/mol
= 21.548 g
The mass of silver metal produced from the reaction is therefore 21.548 grams.
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A __________ change involves a change in the fundamental components of the substance; a given substance changes into a different substance or substances.
Why can a liquid take the shape of the bottom of its container?
The particles of a liquid can flow around one another to new locations.
The particles of a liquid can break free from one another and spread out.
The particles of a liquid can vibrate within their fixed locations.
Answer: Option (a) is the correct answer.
Explanation:
In a liquid state, particles are held less tightly as compared to a solid state. So, they have some kinetic energy due to which they collide with each other.
As a result, particles of a liquid are able to slide past each other. Hence, they are able to acquire the shape and volume of a container in which they are poured.
Whereas when particles of a liquid can break free from one another and spread out then it means a substance is present in a gaseous state.
When the particles of a liquid can vibrate within their fixed locations then it means the substance is present in a solid state. And, they have definite shape and volume.
Thus, we can conclude that a liquid take the shape of the bottom of its container as the particles of a liquid can flow around one another to new locations.
write out the electron configurations for (a) potassium and (b) cobalt. how many unpaired electrons does each possess?
When opposite poles of two magnets are brought together, the poles
Which of the following metals will react with water to produce a metal hydroxide and hydrogen gas?
Mg
Li
Al
Pb
Lithium (Li) will react with water to produce Lithium Hydroxide (LiOH) and hydrogen gas (H2). Magnesium and Aluminum may react under certain conditions, but not readily at room temperature; Lead (Pb) does not react with water.
Explanation:Among the metals listed – Mg (Magnesium), Li (Lithium), Al (Aluminum), and Pb (Lead) – Lithium (Li) will react with water to produce a metal hydroxide and hydrogen gas. When Lithium reacts with water, it forms Lithium Hydroxide (LiOH) and releases hydrogen gas (H2).
Here is the chemical equation for the reaction of Lithium with water:
2 Li (s) + 2 H2O (l) → 2 LiOH (aq) + H2 (g)
Magnesium (Mg) and Aluminum (Al) can also react with water, but usually when they are in the form of powder or at high temperatures, and in the case of Aluminum, it often has an oxide layer that inhibits its reaction with water under normal conditions. Lead (Pb) is not reactive with water under normal conditions.
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Which of the following shows the path followed by nerve impulses in a reflex?
A.motor neurons → interneurons in brain → sensory neurons
B.sensory neurons → interneurons in brain → motor neurons
C.motor neurons → interneurons in spinal cord → sensory neurons
D.sensory neurons → interneurons in spinal cord → motor neurons
Atoms of which element have the most valence electrons?
A. Silicon (Si)
B. Calcium (Ca)
C. Aluminum (Al)
D. Sodium (Na)
When it comes to valence electrons, the atoms of Silicon would have the most of the elements in the option.
Considering the atomic number of each of the elements:
Silicon is 14, the electronic configuration would be 2, 8, 4. Hence there are 4 valence electronsCalcium is 20, the electronic configuration would be 2, 8, 8, 2. Hence, the valence electrons would be 2.Aluminum is 13, the electronic configuration would be 2, 8, 3. Hence, the valance electrons would be 3Sodium is 11, the electronic configuration would be 2, 8, 1. Thus, sodium has 1 valence electronsThus, one can see that Silicon has the highest number of valence electrons of all the elements. Hence, its atom would have the most valence electrons.
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How is data not actually obtained from the experiment represented in a line graph?
with a double line
with only dots
with a colored line
with a broken line
Answer: Broken line
Explanation:
When you collect data in an experiment, you usually need a model where you can analyze the data.
One way of doing this is when in an experiment you expect a given behavior determined by a function (or data obtained by previous investigations), you can graph your obtained data over the graph of the function (or previous data), and in this way, you can see if your data fits in the model.
You usually will graph your obtained data with dots, so usually, we graph the other things with a broken line. This is because if you use a colored line and you do some kind of fitting with your data, the lines may "clash" into each other, making the graph hard to read.
Why was nutmeg also called the spice of madness
Nutmeg was called the 'spice of madness' because of the historical frenzy and extreme control over its trade by European colonists. The Dutch, in particular, went to great lengths to maintain their monopoly, going as far as employing the death penalty for unauthorized trade. Moreover, the term 'madness' could also metaphorically refer to historical instances of intoxication from nutmeg in large doses.
Nutmeg has been called the 'spice of madness' due to the history of its trade, which involved extreme measures by European colonists to control its supply and ensure monopoly profits. The search for a sea route to the Spice Islands, driven by the loss of Constantinople and the fall of the Byzantine Empire in 1453, was motivated by the high demand for spices like nutmeg. European powers, particularly the Dutch, took control of the nutmeg-producing islands and established a monopoly, punishing anyone who dared grow or sell the spice without permission with the death penalty. This ferocious control and the lengths that Europeans went to for these spices, including the destruction of nutmeg trees on outlying islands, reflect the 'madness' associated with the lucrative spice.
In addition to its economic implications, nutmeg has been involved in various historical anecdotes of madness and hallucinatory episodes, sometimes similarly to how ergot poisoning was suspected in other historical outbreaks of convulsions and hallucinations. However, it is crucial to distinguish between the metaphorical 'madness' driven by the obsessive and often ruthless European pursuit of the spice trade and any actual psychoactive effects of nutmeg, which, in very large doses, can indeed cause symptoms such as delirium or hallucinations.