Answer:
4 L or 4000 mL
Explanation:
This question asks for the use of combined gas law:
(P1)(V1) / (T1) = (P2)(V2) / (T2)
...where pressure (P) is in atm, volume (V) is in liters, and temperature (T) is in kelvin.
1000 ml is 1 L, and everything else is already in the right units.
(1 atm)(1 L) / (20 K) = (0.5 atm)(V2) / (40 K)
Just solve the equation for V2, and you get a new volume of 4 liters
(1)(1) / (20) = (.5x) / (40)
1 / 20 = .5x / 40
2 = .5x
x = 4
In an aqueous solution, 42% of a substance dissociates to release hydronium ions. Which of the following statements is true for the substance?
It is a weak acid.
It is a weak base.
It is a strong acid.
It is a strong base.
Answer: The statement it is a weak acid is true for the substance.
Explanation:
An acid that dissociates completely when dissolved in water to give hydrogen [tex](H^{+})[/tex] or hydronium [tex](H_{3}O^{+})[/tex] ions is called a strong acid.
For example, HCl is a strong acid.
[tex]HCl + H_{2}O \rightarrow H_{3}O^{+} + Cl^{-}[/tex]
An acid that dissociates partially or weakly when dissolved in water to given hydrogen or hydronium ions is called a weak acid.
For example, [tex]CH_{3}COOH[/tex] is a weak acid.
[tex]CH_{3}COOH \rightleftharpoons CH_{3}COO^{-} + H_{3}O^{+}[/tex]
A strong base is a base which when dissolved in water then it dissociates completely to give hydroxide ions.
For example, NaOH is a strong acid.
A weak base is a base which when dissolved in water then it dissociates partially or weakly to give hydroxide ions.
For example, [tex]NH_{3}[/tex] is a weak base.
Hence, in an aqueous solution where 42% of a substance dissociates to release hydronium ions shows that the dissociation is less than 50%. This means that substance is dissociating weakly so, it is a weak acid.
Thus, we can conclude that the statement it is a weak acid is true for the substance.
Answer:
It is a weak acid.
Explanation:
I took the test :)
in which group and period of the periodic table is element y placed?
Answer:
In the periodic table element Y is known as Yttrium and the Atomic number is 39. And the group is Transition Metal
URGENT!!!
A solution has a [H3O+] of 1 × 10−5 M. What is the [OH−] of the solution? (5 points)
9 M
14 M
1 × 10−9 M
1 × 10−14 M
Answer:
[tex]{ \bf{from \: ionic \: product \: of \: water : }} \\ { \boxed{ \tt{k _{w} = [H _{3} O {}^{ + } ][OH {}^{ - } ]}}} \\ \\ { \tt{1 \times {10}^{ - 14} = (1 \times {10}^{ - 5} ) [OH {}^{ - } ]}} \\ \\ { \tt{[OH {}^{ - } ] = 1 \times {10}^{ - 9} }} \: M[/tex]
A solution has an [H3O+] of 1 × 10−5 M the [OH−] of the solution will be 1 × 10−9 M and option C is correct.
What is [OH−] of the solution?The water is made up of H2O only and when the pH of it is 7 then the concentration of all the ions would be the same while dissociation the water will get dissociate into H+ ions and OH- ions.
The concentration of OH- ions will be
OH- = Kw {H3O+}
{H3O+} = 1 × 10−5 M.
Kw = 14
substituting the value in the equation,
OH = 14 { 1 × 10−5 M.}
OH = 1 × 10−9 M
Therefore, the solution has an [H3O+] of 1 × 10−5 M the [OH−] of the solution will be 1 × 10−9 M and option C is correct.
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Which of the following happens when a reaction reaches dynamic equilibrium in a closed system? (5 points) A. Reaction stops. B. Reaction happens in both directions. C. The concentrations of the reactants and products increase. D. The concentrations of the reactants and products decrease.
Answer:
B Reaction happens in both directions.
Answer:
B. Reaction happens in both directions!
Explanation:
Dynamic equilibrium is reached once a reaction becomes reversible -- meaning that, when a reaction is in dynamic equilibrium, the forward reaction rate and the backward reaction rate, are equal or occurring at the same time!
Equilibrium is really just like saying they're [the reactions] at a point where they're both "balanced" and so they're equal, nothing is changing and they're going equally both ways! (This is just for explanatory reasons, but "balanced" isn't the correct term to use for dynamic equilibrium, as it is used for other things in Chemistry!)
Hope this helps a little! [And that I didn't confuse you!] :)
Determine the number of protons, electrons, and neutrons present in an atom of patassium. Explain how you determined your answer using complete sentences.
Please make sure your right.
Thank you!!!
At constant temperature and pressure, the coefficients for gaseous species in a valences chemical reaction can be interpreted as? 1) grams 2) pressure 3) volume 4) atoms
El hidróxido de sodio es un compuesto muy importante en el proceso de obtención de detergentes. Determinar la molaridad de la disolución resultante, si se disuelven 8 gramos de hidróxido de sodio en agua hasta preparar 100 mililitros de disolución.
Answer:
2 molL ^ -1
Explanation:
Masa de soluto = 8 g
volumen de solución = 100 mililitros o 0,1 L
Número de moles de solución = masa / masa molar = 8g / 40g / mol = 0,2 moles
concentración = número de moles / volumen
concentración = 0.2 / 0.1
= 2 molL ^ -1
PLEASE HELP, WILL MARK BRAINLIEST How many moles is 2.80 x 1024 atoms of silicon (Si)? Show your work.
Answer:
4.65 moles
Explanation:
1 mole ---> 6.022×10²³ atoms of si
X mole ---> 2.8×10²⁴ atoms of si
X= 2.8×10×10²³/6.022×10²³
=28/6.022
=4.65moles
the structure of butanoic acid
answer on here fjchcjfjdnc.com
Why does the water turn blue after some time when blue ink is dropped in water? Which property
of particles of matter is depicted here?
Answer:
Particles are constatantly moving and diffusing
This is possible because of diffusion
Explanation:
Hope this helps
Which of the following is an advantage of using an energy-efficient household
appliance instead of a traditional household appliance?
A. It works only during the daytime.
B. It uses no electricity
c. It conserves electricity.
D. It does not work as effectively
which of the following element is not in group vii of the periodic table
Answer:
Oxygen group element, also called chalcogen, any of the six chemical elements making up Group 16 (VIa) of the periodic classification—namely, oxygen (O), sulfur (S), selenium (Se), tellurium (Te), polonium (Po), and livermorium (Lv). ... Modern version of the periodic table of the elements (printable).
do the
math!
Wavelength Frequency
Speed
Medium
200 Hz
1500 m/s
The table shows measurements of
some properties of a sound wave in
water and in air.
Water
400 Hz
3.75 m
Water
343 m/s
Air (20°C)
10 m
Calculate Using what you know
about the relationship between
wavelength, frequency, and speed,
fill in the table.
17.15 Hz
343 m/s
Air (20°C)
1a
CHALLENGE What can this table
tell
you about the speed of a wave?
Answer:
everything can be found in the picture
7th grade science help me plsssss
Answer:
They grow slowly over time, they are made up of multiple organisms.
Explanation:
One polyp is one individual. A Coral is made up of several polyps. Each polyp is less than 1 centimeters but a coral is made of many polyp so the coral itself cant be 1 centimeters across.
I need help, please. ASAP anyone willing to help a port innocent child like me
Answer:
Kₑq = [H₂]² [O₂] / [H₂O]²
Explanation:
We'll begin by defining equilibrium constant for a reaction. This is given below:
The equilibrium constant for a given reaction is defined as the ratio of the concentration of the products raised to their coefficient to the concentration of the reactants raised to their coefficient.
With the above information in mind, we shall determine the equilibrium constant for the reaction given in the question above. This is illustrated below:
2H₂O (g) <=> 2H₂ (g) + O₂ (g)
Kₑq = [H₂]² [O₂] / [H₂O]²
Air is a solution of gases, what is the solvent in air?
What dose the wave carry
Answer:
Waves carry energy from one place to another.
Because waves carry energy,some waves are used for communication,eg radio and television waves and mobile telephone signals.
Explanation:
i hope it helps
that's my answer
correct me if im wrong
#carryonlearningII. Which statement seems more likely to be true?
A.
Double replacement reactions are always neutralizations.
B.
Neutralizations are always double replacement reactions.
Answer:
B
Explanation:
Neutralisations are always double replacement reactions
The table below shows two types of electromagnetic waves and three random applications of electromagnetic waves.
Type of Wave Applications of Waves
Gamma rays 1. Used in spectrometers to measure elements on the surface of celestial bodies
Radio waves 2. Used to measure gravity fields
3. Detect the heat released by astronomical objects
Which of these best matches the waves with their applications?
Gamma rays—2 and radio waves—3
Gamma rays—3 and radio waves—2
Gamma rays—2 and radio waves—1
Gamma rays—1 and radio waves—2
Answer:
Gamma rays—3 and radio waves—2
Explanation:
hard time seeing question, but i believe it is Gamma rays—3 and radio waves—2
In the diagram shown, what is occurring at the section marked 4 ?
Temperature
:: ا
4
2
Heat Energy
O Melting
Freezing
O Condensation
O Vaporization
Answer:
Vaporization
Since the question does not specify what molecule is being acted upon by the increment in temperature, I'll assume it's water.
When first taken out of the fridge, water is in the form of ice, and it has not been affected by a change in temperature yet, so it's at the origin.
(origin = ice)
As you raise the temperature, however, the ice starts to melt, and melting occur during phase 2. You have to keep the temperature constant for the process to properly occur.
(phase 2 = melting)
After it finishes melting, the ice is now in it's liquid state, which is water. The temperature continues to rise in order to proceed to the next phase.
(2nd slope = water)
Lastly, Water is being vaporized during phase 4. Notice, the temperature is kept constant in order to allow the process to properly occur.
(phase 4 = vaporization)
Why do avocados brown?
Explanation:
bc they are avocado.. and brown
Which particles are transferred during a redox reaction
Answer:
Most oxidation-reduction (redox) processes involve the transfer of oxygen atoms, hydrogen atoms, or electrons, with all three processes sharing two important characteristics: (1) they are coupled—i.e., in any oxidation reaction a reciprocal reduction occurs, and (2) they involve a characteristic net chemical change— .
Electrons will be transferred during redox reaction.
What is electron?The electron is subatomic particles which are placed in surrounding the nucleus. Electrons carry negative charge.
What is redox reaction?Redox reaction involve the transfer of electrons between intermediates. A redox reaction occurs when the oxidation states of the substrate change. The removal of electrons or even a rise in the oxidation state of such a chemical or its atoms is referred to as oxidation. The acquisition of electrons or a lowering in the oxidation number of a chemical or the atoms inside it is referred to as reduction.
Hence the answer will be electron
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When two ice skaters initially at rest push off one another, their final
momenta are..."
Answer:B
Explanation:
PLEASE HELP ME
How are the electron structures of hydrogen (H) and lithium (Li) similar?
A. They both have 1 electron in an s sublevel.
B. Neither one has any valence electrons.
C. They both have valence electrons in the 1s sublevel.
O D. They both have valence electrons in the first main energy level.
The electron structures of hydrogen (H) and lithium (Li) are similar as " they both have 1 electron in an s sublevel".
What is sub-level?The quantum theory defines a sublevel as an energy level. Sublevels in chemistry refer to the energy caused by electrons. Sublevels can also relate to energy caused with the nucleus in physics.
It is know that the atomic number of hydrogen is 1 and the atomic number of lithium is 3.
The electronic configuration of H = [tex]1s^{1}[/tex].
The electronic configuration of Li = [tex]1s^{2} 2s^{1}[/tex].
Its can be seen that hydrogen and lithium both posses 1 electron in s sublevel
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type of intermolecular forces in paraffin
Answer:
The intermolecular forces between paraffin molecules are entirely due to dispersion forces, and are therefore size dependent.
Explanation:
Answer: The intermolecular forces between paraffin molecules are entirely due to dispersion forces, and are therefore size dependent.
Explanation:
The intermolecular forces between paraffin molecules are entirely due to dispersion forces, and are therefore size dependent. 103 Paraffin wax is soluble in: a) water; b) hexane; c) acetone; d) ethanol Is shopping bag (polyethylene)
hope it helps
In which type of bond are electrons shared equally between two atoms?
Answer:
Nonpolar Covalent Bond
Explanation:
A nonpolar covalent bond is one in which the bonding electrons are evenly distributed between the two atoms.
Good Luck!
Hope this helps!
:)
What volume of water is needed to make up a 6.00% (m/v) solution of copper (II) sulphate when 12.0 g of it will be added to water?
Answer:
200 mL of water is needed to make up a 6.00% (m/v) solution of copper (II) sulphate when 12.0 g of it will be added to water.
Explanation:
The solution is the result of the mixture between the solute, which is the substance that dissolves, and the solvent, which is the substance in which a solute dissolves. That is, a solution (or solution) is a mixture of two or more components, perfectly homogeneous since each component is intimately mixed with the other.
The concentration of solutions is the amount of solute contained in a given amount of solvent or solution. A unit of concentration is the percent weight to volume.
The percent weight to volume is the percentage ratio between the weight of the solute and the volume of the solution. It is calculated as:
[tex]Percent =\frac{mass of solute}{volume of solution} *100[/tex]
Mass is measured in grams, while volume is measured in mL.
In this case:
Percent weight to volume= 6%mass of solute= 12 gvolue of solution= ?Replacing:
[tex]6=\frac{12 g}{volume of solution} *100[/tex]
Solving:
volume of solution*6= 12 g*100
[tex]volume of solution=\frac{12 g}{6} *100[/tex]
volume of solution= 200 mL
200 mL of water is needed to make up a 6.00% (m/v) solution of copper (II) sulphate when 12.0 g of it will be added to water
Given the equilibrium reaction at constant pressure:
2HBr(g) + 17.4 kcal — H2(g) + Br2(g)
When the temperature is increased, the equilibrium will shift to the
A Right, and the concentration of HBr(g) will increase
B Left, and the concentration of HBr(g) will decrease
C Right, and the concentration of HBr(g) will decrease
D) Left, and the concentration of HBr(g) will increase
Answer: C Right, and the concentration of HBr(g) will decrease
Since it is an endothermic reaction the equilibrium will shift to the right direction i.e. product side decreasing concentration f HBr.
In the case when the temperature is increased so here the equilibrium should be shifted to the right and the concentration of HBr(g) will decrease.
Impact on increase in temperature:The given reaction represent the endothermic reaction since it absorb the heat.
So in the case when there is endothermic reaction so here there should be increase in temperature since the reaction should goes forward direction and the concentration of HBr(g) will decrease.
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In which of the following substances do you find strong hydrogen bonding?
A hydrogen sulphide
B liquid ammonia
D hydrogen gas
C hydrochloric acid
Answer:
The strength of an individual H bond depends on the polarity of the H-X bond and therefore on the electronegativity of X ( the more delta positive the H atom, the stronger the electrostatic force of attraction between it and a lone pair of electrons). Thus, on a per bond basis, HF H bonding is strongest. However, as water has two H atoms, each molecule can form two H bonds so on a per molecule basis, water H bonding is strongest (this is evidenced by the boiling points of the three substances; NH3 < HF < H2O.)
Explanation:
Correct me if I'm wrong
The Copper Chloride solution used in the investigation contained 300 grams per dm3 of solid CuCl2 dissolved in 1dm3 of water.
The student used 50cm3 of copper chloride solution in each experiment. Calculate the mass of solid copper chloride used in each experiment.
Answer:
The mass of solid copper chloride used in each experiment=15 g
Explanation:
We are given that
Mass of copper chloride in solution=300g/dm3
Volume of solution used in each experiment=50 cm3
We have to find the mass of solid copper chloride used in each experiment.
[tex]1cm^3=0.001 dm^3[/tex]
[tex]50cm^3=0.05 dm^3[/tex]
1 dm3 contained solid copper chloride=300 g
0.05 dm3 contained solid copper chloride=[tex]300\times 0.05[/tex]g
0.05 dm3 contained solid copper chloride=15 g
Hence, the mass of solid copper chloride used in each experiment=15 g
