Answer:
D. Detritivore
Explanation:
Detritivores are decomposers that break down dead organic matter by consuming it, like worms.
verify
- ( -x ) = x
tell me answer
Explanation:
We have to verify that: - ( -x ) = x
Let us take x = 2 on LHS
- (-2) = 2
Take x = 3
-(-3) = 3
Take x = 4
-(-4) = 4
Thus for each value of x the value of - (-x) is always positive x.
Thus verified.
In redox reactions, the reactant that is oxidized is also called the _________.
a. oxidizing agent.
b. reducing agent.
c. reductant.
d. oxidant.
In redox reactions, the reactant that is oxidized is also called the reducing agent and is denoted as option B.
What is a Reducing agent?These are compounds which take part in a chemical reaction and lose their electrons in the process.
This leads to them becoming oxidized in a redox reaction and then acts as a reducing agent to the other compound.
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there are two correct answers, reducing agent, and reductant
How does high pressure effect the solubility of a gas?
Answer:
Gases as might be expected, increase in solubility with an increase in pressure. Henry's Law states that: The solubility of a gas in a liquid is directly proportional to the pressure of that gas above the surface of the solution. ... When the bottle is opened, the pressure above the solution decreases.
Answer:High pressure increases the solubility.
Explanation: i just took the quiz
Which of the following is true about the Lewis structure of NF3? Really need help
Answer:
All of the above.
Explanation:
Hello there!
In this case, according to the definition of the Lewis structures, which are represented by the valence electrons, we first identify that the N atom has five valence electrons and each fluorine has seven valence electrons.
In such a way, we cans say that N is the central atom due to its lower electronegativity, the molecule has 7+7+7+5=26 valence electrons and the three F-N bonds are covalent, therefore the answer is all of the above.
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What compound of
calcium is used
for makings refraction furnace linings
-. How many moles of Pb are contained in 2.49 x 1025 atoms Pb?
Answer: There are [tex]4.13 \times 10^{-3}[/tex] moles of Pb are contained in [tex]2.49 \times 10^{25}[/tex] atoms Pb.
Explanation:
According to the mole concept, 1 mole of every substance contains [tex]6.023 \times 10^{23}[/tex] atoms.
Hence, number of moles present in [tex]2.49 \times 10^{25}[/tex] atoms of Pb are as follows.
[tex]No. of moles = \frac{2.49 \times 10^{25}}{6.023 \times 10^{23}}\\= 4.13 \times 10^{-3} mol[/tex]
Thus, we can conclude that there are [tex]4.13 \times 10^{-3}[/tex] moles of Pb are contained in [tex]2.49 \times 10^{25}[/tex] atoms Pb.
True or False: Both molecules and compounds are pure substances.
Answer:
False
Explanation:
Hope this helps!
Answer:
True
Explanation:
It's because both compounds and elements are considered pure substances and a molecules is considered an element.
Determine which base will work to deprotonate each compound in an acid/base extraction.
Benzene ring with a carboxylic acid on one carbon and a methyl ester group on the opposite carbon __________
Benzene ring with a three carbon chain attached to one carbon. At the other end of the three carbon chain is a hydroxyl group. ___________
Benzene ring with a hydroxyl group attached to one carbon and a tertbutyl group attached to the opposite carbon __________-
Answer:
A common method is to perform an acid-base reaction, which can ... acid is not particularly water-soluble due to its nonpolar aromatic ring, ... An acid-base extraction can be used to extract carboxylic acids from ... carbonic acid (H2CO3) can decompose to water and carbon dioxide gas.
Explanation:
The bases that will work to deprotonate the compounds are :
NaHCO₃ or NaOH.metal alkoxidesNaOHThe Benzene ring with carboxylic acid which is a weak acid can be deprotonated using NaOH or NaHCO₃ because of the weakness of the carboxylic acid.
Metal alkoxides like potassium tertiary butoxide can be used to deprotonate a Benzene ring with three carbon chain attached to a single carbon, and also containing a hydroxyl group is a very weak acid hence the use of Metal alkoxides.
Benzene ring with a hydroxyl group attached is also a weak acid just like the Benzene ring with carboxylic group hence it can also be deprotonated using NaOH
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An element contains 25 electrons. How many empty orbitals are in its valence energy level?
Answer:
No empty orbitals but five unpaired electrons.
Explanation:
Hello there!
In this case, when going over the empty orbitals in valence energy levels, it is required to develop the electron configuration in order to appropriately describe the element. In such a way, for the element whose atomic number is 25 because it equals the number of electrons, we obtain:
[tex]1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^5[/tex]
It means that the d orbital is half filled which means that it does not have any empty orbital wherein two electrons are contained per orbital. Moreover, we can find 5 unpaired electrons according to:
↑ ↑ ↑ ↑ ↑
Which is the orbital notation.
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A substance with a lower specific heat capacity would:
1. Heat up faster and cool down slower
2. Heat up faster and cool down faster
3. Heat up slower and cool down faster
4. Heat up slower and cool down slower
Answer:
i think 2
Explanation:
i only think 2 i only think
If a gas occupies 79.5 mL at -1.4°C, what temperature, in Kelvin, would it
have if the volume was reduced to 35.3 mL and the pressure is held constant?
constant?
Answer:
121 K
Explanation:
Step 1: Given data
Initial volume (V₁): 79.5 mLInitial temperature (T₁): -1.4°CFinal volume (V₂): 35.3 mLStep 2: Convert "-1.4°C" to Kelvin
We will use the following expression.
K = °C + 273.15 = -1.4°C + 273.15 = 271.8 K
Step 3: Calculate the final temperature of the gas (T₂)
Assuming ideal behavior and constant pressure, we can calculate the final temperature of the gas using Charles' law.
V₁/T₁ = V₂/T₂
T₂ = V₂ × T₁/V₁
T₂ = 35.3 mL × 271.8 K/79.5 mL = 121 K
Usually, when the temperature is increased, what will happen to the rate of dissolving?
A)
It will stop.
B)
It will increase.
C)
It will decrease.
D)
It will remain the same.
Answer:
answer is g 3456
Explanation:
A helium balloon has a volume of 25 L when the pressure is 1.551 ATM and the temperature is 20°C. The balloon is cooled at a constant pressure until the temperature is -11°C. What is the volume of the balloon at this stage?
Answer:
The balloon is cooled at a constant pressure until the temperature is -11°C. What is the volume of the balloon at this stage?
The coordination compound Co3[Cr(CN)6]2 contains Co2+ cations and a complex anion. What is the likely oxidation state for Cr in the anion?
Answer:
-3
Explanation:
The oxidation state or oxidation number of an atom is the total number of electrons that an atom either gains or loses in order to form a chemical bond with another atom.
The complex anion here is [Cr(CN)6]3-.
Now, as the oxidation state of CN or cyanide ligand is -1, and if we suppose the oxidation state of Cr to be 'x', then; x - 6 = -3 (overall charge on the anion),
so x= +3. Hence the oxidation state of Chromium in this complex hexacyanochromium (III) anion comes out to be -3.
.
does alkene/alkyne has isomers?
depend on which of them , they can have for example we have 1-buten ,2buten , iso buten(structural isomers) also they can have sterio isomers too
Which chemical reaction is the slowest?
A. Cake rises as it cooks in the oven.
B. Drain cleaner fizzes up as it encounters blockages in a pipe.
C. Baking soda and vinegar react.
D. Milk turns sour.
WILL GIVE BRAINLIEST!!
Answer:
Milk turns sour
The chemical reaction or chemical change which is slowest is milk turning sour as it involves enzymatic actions which are slow reactions.
What is a chemical change?Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical changes:
1) inorganic changes
2)organic changes
3) biochemical changes
During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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Given the molar absorptivity for a species X of 1600 M-1cm-1 at a wavelength of 270 nm, and 400 M-1cm-1 at a wavelength of 540 nm. For species Y, the molar absorptivity at 270 nm is 200 M-1cm-1 and 8000 M-1cm-1 at 540 nm. For a certain mixture, the absorbance at 270 nm is 0.5 and, at 540 nm, is also 0.5. What is the concentration of species Y in the mixture
Answer:
Explanation:
From the given information:
At wavelength = 270 nm
[tex]\varepsilon x_1 = 1600 \ m^{-1} \ cm^{-1} \\ \\ \varepsilon y_1 = 200 \ m^{-1} \ cm^{-1}[/tex]
At 270 nm
Suppose x is said to be the solution for the concentration of x and y to be the solution for the concentration of y;
Then:
[tex]\varepsilon x_1 \ l + \varepsilon y_1 \ l= 0.5 \\ \\ A = A_1 + A_2[/tex]
[tex]1600 xl + 200 yl= 0.5[/tex]
Divide both sides by 200
[tex]8xl + yl = \dfrac{0.5}{200}[/tex]
[tex]8x + y = \dfrac{0.5}{200}l[/tex]
Use l = 1cm (i.e the standard length)
Then;
[tex]8x + y = \dfrac{0.5}{200} ---- (1)[/tex]
For 540 nm:
[tex]\varepsilon x_2 x \ l + \varepsilon y_2 y \ l= 0.5 \\ \\ 40 xl + 800 yl = 0.5[/tex]
[tex]x + 20 y = \dfrac{0.5}{400 \ l}[/tex]
since l = 1
[tex]x + 20 y = \dfrac{0.5}{400 \ } --- (2)[/tex]
Equating both (1) and (2) together, we have:
[tex]8x + y - 8x - 160 y = \dfrac{0.5}{200} - \dfrac{0.5 \times 8}{400} \\ \\ \implies - 159 y = \dfrac{0.5}{200} ( 1 - \dfrac{8}{2}) \\ \\ -159 y = \dfrac{-0.5 \times 3}{200} \\ \\ 159 \ y = 0.0075 \\ \\ y = \dfrac{0.0075}{159} \\ \\ y = 0.00004716 \\ \\ y = 4.7 \times 10^{-5 } \ M[/tex]
why is there need to standardize a solution
standardization of a volumetric solution used for titration is one of the most important preconditions for reliable and transparent titration results.
A sample of nitrogen gas was collected via water displacement. Since the nitrogen was collected via water displacement, the sample is saturated with water vapor. If the total pressure of the mixture at 2121 °C is 1.721.72 atm, what is the partial pressure of nitrogen? The vapor pressure of water at 2121 °C is 18.718.7 mm Hg
Answer:
Explanation:
Total pressure = partial pressure of nitrogen + partial pressure of water vapour
partial pressure of water vapour = 18.7 mm of Hg
760 mm of Hg = 1 atm
18.7 mm of Hg = 18.7 / 760 atm
= .0246 atm
Total pressure = partial pressure of nitrogen + partial pressure of water vapour
Putting in the values in atm
1.72 atm = partial pressure of nitrogen + .0246 atm
partial pressure of nitrogen = 1.72 atm - .0246 atm
= 1.6954 atm
= 1.70 atm
partial pressure of nitrogen = 1.70 atm .
40. (08.05 LC)
The pH of four different substances is shown below.
Substance
pH
Household cleaner 11
Household bleach
13
Baking soda
8
00
Toothpaste
9
Which substance is the most basic? (5 points)
Household cleaner
Household bleach
Baking Soda
Toothpaste
Answer:
Household bleach
13
Explanation:
- ph is stong acid 14 is a strong base
The substance household bleach having a pH of 13 is the most basic substance.
What is basicity?The term basicity of a substance refers to the concentration of the hydroxide ion in the susbstance. In effect, "how basic" the substance is.
The pH scale is a measure of acidity/basicity. A pH that is above 10 shows very basic. The substance household bleach having a pH of 13 is the most basic substance.
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If 3.00 liters of 2M HCl neutralizes 1.00 liter of NaOH, what is the molarity of the NaOH?
Answer:
[tex]M_{base}=6M[/tex]
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to realize this is a question about titration, which base solved by knowing that the HCl reacts with the NaOH in a 1:1 mole ratio, and therefore, we can write the following:
[tex]M_{acid}V_{acid}=M_{base}V_{base}[/tex]
Thus, we solve for the molarity of the base, NaOH, as shown below:
[tex]M_{base}=\frac{M_{acid}V_{acid}}{V_{base}} \\\\M_{base}=\frac{3L*2M}{1.00L}\\\\M_{base}=6M[/tex]
Regards!
Calculate the number of joules of heat energy needed to increase the temperature of 25.0 g of metal from 21.0 ºC to 80.0 ºC. The specific heat of the metal is 0.521 J/gºC.
Answer:
Q = 768.47 J
Explanation:
Given that,
Mass of the metal, m = 25 g
Initial temperature, T₁ = 21.0 ºC
Final temperature, T₂ = 80.0 ºC
The specific heat of the metal is 0.521 J/gºC.
We know that the heat released due to the change in temperature is given by :
[tex]Q=mc\Delta T\\\\=25\times 0.521\times (80-21)\\Q=768.47\ J[/tex]
Hence, 768.47 J of heat energy will be needed.
Observe the above circuit diagram, if the gap is filled with a plastic wire, will the bulb glow? Justify your answer
Answer:
YES THE BULB WILL GLOW.
Explanation:
BECAUSE THE CIRCUIT UPPER AREA IS MADE OF PLASTIC SO THE PLASTIC CONDUCTS THE ELECTRICITY SO THE BULB WILL GLOW.
A 3.458 g sample of KHP, a monoprotic acid, requires 45.71 mL of a KOH solution to reach the endpoint. What is the concentration of the KOH solution? The molar mass of KHP is 204.22 g/mol.
Answer:
[tex]M_{KOH}=0.3704M[/tex]
Explanation:
Hello there!
In this case, since the titration of bases when using monoprotic acids like KHP, occurs in a 1:1 mole ratio, it is possible to use the following equation, because at the endpoint the moles of the KHP and KOH get equal:
[tex]n_{KHP}=n_{KOH}[/tex]
In such a way, we first calculate the moles of KOH given the mass and molar mass of KHP:
[tex]n_{KHP}=n_{KOH}=3.458g*\frac{1mol}{204.22g}=0.0169mol[/tex]
Next, since we have the volume of KOH, we first take it to liters (0.04571 L) to that we obtain the following concentration:
[tex]M_{KOH}=\frac{0.0169mol}{0.04571L}\\\\M_{KOH}=0.3704M[/tex]
Regards!
How much heat energy is required to boil 66.7 g of ammonia, NH3? The molar heat of vaporization of ammonia is 23.4 kJ/mol.
Answer:
91.7 kJ
Explanation:
Step 1: Given data
Mass of ammonia (m): 66.7 gMolar heat of vaporization of ammonia (ΔH°vap): 23.4 kJ/molStep 2: Calculate the moles (n) corresponding to 66.7 g of ammonia
The molar mass of ammonia is 17.03 g/mol.
66.7 g × 1 mol/17.03 g = 3.92 mol
Step 3: Calculate the heat (Q) required to boil 3.92 moles of ammonia
We will use the following expression.
Q = ΔH°vap × n
Q = 23.4 kJ/mol × 3.92 mol = 91.7 kJ
Acts as the digestive system inside a cell. It helps to break down old or unneeded parts of the cell, and substances that have been brought into the cell from the outside. WHO I AM?
Answer:
I think it is enzymes
Explanation:
Select the keyword or phrase that will best complete each sentence. A Claisen reaction is a nucleophilic ____________ in which an enolate is the nucleophile.
Answer:
Substitution.
Explanation:
Claisen reaction was first published in 1887 by a prominent German chemist known as Rainer Ludwig Claisen.
A Claisen reaction is a nucleophilic substitution in which an enolate is the nucleophile. It's typically a reaction of two molecules of an ester to form a β-keto ester, in the presence of an alkoxide base. Thus, a Claisen reaction is simply a characteristic condensation reaction of esters through a nucleophilic carbonyl substitution with an enolate such as a ketone enolate or an ester enolate.
Furthermore, a Claisen reaction results in the formation of a carbon-carbon bond in the presence of a strong base to yield a β-keto ester.
If you wanted to make .5 L of a 1 mole/L (M) of MgSO4 solution, how many grams of MgSO4 would you use?
Answer:
0.5 grams
Explanation:
Atmospheric pressure decreases as altitude increases. In other words, there is more air pushing down on you at sea level, and there is less air pressure pushing down on you when you are on a mountain.If pentane (C5H12), hexane (C6H14), and hexanol (C6H13OH) are heated evenly at different altitudes.
Required:
Rank them according to the order in which you would expect them to begin boiling.
Answer:
Pentane » Hexane » Hexanol
Explanation:
Pentane and Hexane are simple molecular structured with discrete molecules having weak vanderwaals forces of attraction. But Hexane has high molecular mass than pentane hence pentane has lower boiling point than Hexane.
Hexanol has hydrogen bonds between highly electronegative oxygen atom and the hydrogen atom which break on high heat energy application hence it has high boiling point.
The Atlantic ocean grows in size due to a
A. thrust boundary
(B. divergent boundary)
C. transform boundary
D. convergent boundary
Answer:
B. Divergent boundary
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