Answe 174.0 KPA
Explanation:
0°C in 101.3 K PA pressure a sample of gas occupies 30 mL if the temperature is increased to 30°C in the entire gas sample is transferred to a 20 mL container what will be the gas pressure inside a container
PV=nRTt
so
n = PV/RT
P = 101.3 KPA
T = 0+273.2 = 273.200
V = (30/1000) L = 0.03 L
R =0.082
SO
n= (101.3 X 0.03)/(0.082 X 273.2)
= 0.14 moles
PV= nRT
N= 0,14
T = 30 + 273.2= 303.2
V= (20/1000)L =0.02L
since PV = nRT
THEN
P=nRT/V
so
P=(0.14 X 0.082 X 303.2)/0.02 =
174.0 KPA
Why must protein digesting enzymes be stored in the inactive form
Answer:
To shield the organs and glands from the enzymes' digestion, protein digesting enzymes are released in an inactive state. If they are discharged in an active state, they begin digesting the glands that transport them as well as the release site.
Explanation:
The crystal size of an igneous rock is described as its _____.
Explanation:
The crystal size of an igneous rock is described as it's texture
Which of these is a ball and stick model?
C subscript 2 H subscript 4.
2 overlapping large black spheres each with 2 small blue spheres overlapping it.
2 medium sized black spheres connected by 2 grey sticks. Each black sphere has 2 small blue spheres connected to it by 1 grey stick.
2 C's connected by 2 black lines. Each C has 2 H's connected to it each by 1 black line.
The ball and stick model of C subscript 2 H subscript 4 is described as Option C: Each C has 2 H's connected to it each by 1 black.
This means the same as the 3D structure image of ethylene (C2H4) and means 2 C's connected by 2 black lines.
line.
The structure of ethylene is made up of 2 carbon atoms and 4 hydrogen atoms.
The carbon atoms are located at the middle position and the hydrogen atom surrounding the carbon atoms with two hydrogen atoms connected to each carbon atom. The two black lines connecting the carbons are the double bonds.
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Answer:
C
Explanation:
Will you be my Magnesium, Silver, Nitrogen but "9.8m/s²" is silent?
Please help me here
PLEASE HELP: Can't figure this out!
-The substance is a liquid at room temperature.
-When you dissolve it into water, it doesn't conduct electricity.
-The substance boils at 45 oC.
Which is the most likely bond type for this substance?
Choices:
Covalent bond
Metallic bond
Ionic bond
Hydrogen bonding
Cation-pi bond
Answer:
Covalent bond
Explanation:
All the characteristics of a Covalent bond are being described.
When, a substance boils at 45degree C. Then, the most likely bond type for the given substance is a covalent bond. Option A is correct.
Liquid at Room Temperature: The fact that the substance is a liquid at room temperature suggests that the intermolecular forces holding its molecules together are relatively weak. Covalent compounds often have weaker intermolecular forces compared to ionic or metallic compounds.
Doesn't Conduct Electricity When Dissolved in Water: Covalent compounds, in general, do not conduct electricity when dissolved in water. This is because they do not dissociate into ions in solution, which is necessary for electrical conductivity. Ionic compounds, on the other hand, typically dissociate into ions and can conduct electricity in solution.
Boils at 45°C: The relatively low boiling point (45°C) indicates that the intermolecular forces in the substance are weak. Covalent compounds tend to have lower boiling points compared to ionic or metallic compounds, which often have stronger bonding.
Considering these factors, the substance is likely held together by covalent bonds, which involve the sharing of electrons between atoms. This allows for the formation of discrete molecules with weak forces between them.
Hence, A. is the correct option.
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--The given question is incomplete, the complete question is
"The substance is a liquid at room temperature.-When you dissolve it into water, it doesn't conduct electricity.-The substance boils at 45 oC. Which is the most likely bond type for this substance? Choices: A) Covalent bond B) Metallic bond C) Ionic bond D) Hydrogen bonding E) Cation-pi bond."--
GAS LAW PROBLEMS:
1. A gas sample has an original volume of 680 ml when collected at 720 mm and 28°C. What will be the volume of the gas sample if the pressure increases to 820 mm and the temperature increases to 55°C?
2. A gas sample has an original volume of 580 ml when collected at 1.20 atm and 22°C. If a change is made in the gas pressure which causes the volume of the gas sample to become 1.45 liters at 40°C, what is the new pressure?
3. A gas sample has an original volume of 760 ml when collected at 700 mm and 40°C. If a change is made in the gas temperature which causes the volume of the gas sample to become 420 ml at 1.25 atm, what is the new temperature?
4. A gas sample containing 0.546 mole collected at 700 mm and 25°C. would occupy what volume?
5. A sample of CO2 gas which weighs 1.62 grams has a volume of 1.02 liters when collected at 20°C. What would be the pressure of the gas sa
Answer:
o
Explanation:
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shshdbsussbbzishxbsbbxusbxhzjjxchinga subs sh is znsoa d bea s for the last time you know. tumamamsr rnnfnt I. NJ just bought new house but he got very very very big but just very kind just bought him just now just now but he has his house but he has his house in his house haha hriirnr is Enfield in his head ️ BF do feel free for me quebro Ayer dry do it for you to do feel like fun for ️ do feel like fun fun fun fun for the last time fun for the last time for free from my gf for free from the other side for from a fe has his house haha he has been busy hereditary so we are going through it and don't feel free can go jump yes very big lol that good in my head that ft in a good game from good get good good GG from a great gAA
Why is the spectroscope scale illuminated?
Answer:
The spectroscope scale is illuminated so that one can know exactly where the wavelengths of the lines are falling along.
Question 1
Compound Y is thermally decomposed with carbon using the apparatus below.
Reaction tube
Compound Y
and carbon
1
Heat
Limewater
A brown solid is formed in the reaction tube and the limewater turns cloudy.
What is compound Y?
А
Copper (11) oxide
B
Calcium oxide
с
Magnesium oxide
D
Sodium oxide
A brown solid is formed in the reaction tube and the lime water turns cloudy. The compound Y is calcium hydroxide. Therefore, A is correct.
What is lime water ?The common name for a saturated aqueous calcium hydroxide solution is lime water. At room temperature, calcium oxide (Ca(OH)2) is only weakly soluble in water.
Saturated calcium hydroxide solution is sometimes known as lime water or milk of lime. Ca(OH)2 is its chemical formula. Instead of the fruit sense of lime, the name is based on the mineral sense of lime. Lime wash is the name given to lime water used as paint.
Slaked lime, often known as calcium hydroxide, is an inorganic substance having the chemical formula Ca(OH)2. When water is combined with quicklime (calcium oxide), a colorless crystal or white powder is created.
Thus, option A is correct.
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PLEASE HELP ASAPPPPPPPPPP
Answer:
c
Explanation:
Answer:
I think the first one
Explanation:
I think because it is going from 600 to 400 it is decreasing
100.mL of a .795 M solution of KBr is diluted to 500.mL. what is the new concentration of the solution?
Answer:
0.159 M
Explanation:
convert from mL to L then use the equation:
M1V1 = M2V2
rearrange to find M2
[tex]\frac{M1V1}{V2} = M2[/tex]
[tex]\frac{(0.795 M)(0.100 L)}{0.500 L} = 0.159 M[/tex]
describe why silver cookware tarnishes, especially in the present of sulfer-containing food such as eggs
Answer:
The result of a chemical reaction between the silver and sulfur-containing substances in the air. The silver is actually combining with sulfur and forming silver sulfide. When a thin coating of silver sulfide forms on the surface of silver, it darkens the silver.
hope u liked the answer, pls mark me as the brainliest
Which of the following are covalent compounds? Select all that apply.
CaO
CO2
KBr
NO
Answer
CO2 and NO are covalent
Explanation:
Which of the following are covalent compounds? Select all that apply.
CaO
CO2
KBr
NO
the atoms ib covalent compounds share electron pairsO
CaO and KBr are ioinic
CO2 and NO are covalent
The covalent compounds are [tex]CO_2[/tex] and [tex]NO[/tex].
The covalent compounds are bonded to each other by the mutual sharing of electrons between them referred to as the covalent bond in the structure.
Covalent bonds are chemical bonds formed when two atoms share electrons to achieve a stable electron configuration. In covalent bonding, atoms combine by sharing their outermost electrons to achieve a full valence electron shell.
Covalent bonds typically form between nonmetal elements that have similar electronegativities.
The rest of the compounds are held by the ionic forces of attraction and hence referred to as the ionic compounds. An ionic compound contains a metal and a non-metal to be bonded to each other.
Therefore, the covalent compounds provided in the list are [tex]CO_2[/tex] and [tex]NO[/tex].
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What forms of energy are emitted from stars? (Select all that apply.) invisible light chemical heat sound visible light
Answer:
electromagnetic radiation
Explanation:
heat sound and invisible light
Question 1 of 5
An astronaut in orbit squirts water into the air in a
spacecraft. The drops form spheres in the air.
Which property of liquid water is the astronaut demonstrating?
A. High surface tension
B. Low surface tension
C. Low viscosity
D. High viscosity
Answer:
It's A
Explanation:
High Surface Tension
A diver breathes a heliox mixture with an oxygen mole fraction of 0.050. What must the total pressure (in atm) be for the partial pressure of oxygen to be 0.21 atm?
Answer:
4.2 atm
Explanation:
Dalton’s Law of Partial Pressures
PA = XA(PT)
Partial pressure of A = mole factor of gas A x total pressure of all gases
PA = 0.21 atm
XA = 0.050
PT= ?
0.21atm= 0.050(PT)
0.21/0.050 = PT
PT = 4.2 atm
The total pressure of gases must be 4.2 atm for the partial pressure of oxygen to be 0.21 atm.
How to calculate partial pressure?The partial pressure of a gas can be calculated using Dalton's law of partial pressure equation as follows:
PA = XA(PT)
Where;
PA = partial pressure of oxygen XA = mole factor of oxygenPT = total pressure of all gasesBased on the information given in this question;
PA = 0.21 atmXA = 0.050PT= ?0.21 atm = 0.050 (PT)
0.21/0.050 = PT
PT = 4.2 atm
Therefore, the total pressure of gases must be 4.2 atm for the partial pressure of oxygen to be 0.21 atm.
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1. What branch of chemistry is foundational to the other
areas of chemistry?
Answer:
Physical, Inorganic, Biochemistry, Analytical, and Organic
Physical chemistry deals with applying physics to the study of matter. It's also probably the most important branch. Inorganic chemistry deals with stuff that is chemically composed of elements other than carbon. The branch of Biochemistry concerns itself with living things. Analytical chemistry deals with analyzing and finding out what substances are present in a particular material and how much of each substance is present. Finally, organic chemistry deals with substances that are compounds of carbon.
Explanation:
A vapor volume of 1.17 L forms when a sample of liquid acetonitrile, CH3CN, absorbs 1.00 kJ of heat at its normal boiling point (81.6 °C and 1 atm). What is Hvap in kilojoules per mole of CH3CN?
The heat of vaporization of CH3CN is obtained from the question as 25 KJ/mol.
We can obtain the number of moles from;
PV = nRT
P = 1 atm
V = 1.17 L
n = ?
R = 0.082 atm LK-1mol-1
T = 81.6 °C + 273 = 354.6 K
n = PV/RT
Substituting values;
n = 1 atm × 1.17 L/0.082 atm LK-1mol-1 × 354.6 K
n = 0.04 moles
Using; q = n·ΔHv
q = Heat absorbed
n = number of moles
Hv = Heat of vaporization
ΔHv = q/n
ΔHv = 1.00 × 10^3/0.04
ΔHv = 25 KJ/mol
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A radio station has a frequency of 9.09 x 107 Hz. What is the energy of the radio waves the station emits from its radio tower?
Answer:
well it depends of the distance, but u get your frequency and u times it by a round number if im correct
Explanation:
Your private gas collection consists of the four following gases, with each gas in a separate container, and exactly 1.0 g of each gas: CO2(g). Ne (g), Cl2
(g), and H2S (g). Which of your prized gases occupies the smallest volume at standard temperature and pressure (STP)?
H2S (g)
CO2 (g)
Cl2 (g)
Ne (g)
Answer:Cl2
Explanation:each gas is 1 gm and has the same P andT. The gas with the highest molar mass will have the lowest volume with least moles. Cl2 wins the prize
Choose the best description that matches the following equation:
2K3PO4 + 3MgSO4 --> Mg3(PO4)2 + 3K2SO4
a) Redox, decomposition
b) Non-redox, synthesis
c) Redox, single displacement
d) Non-redox, double displacement
e) Redox, combustion
Answer:
Non-redox, double displacement
Explanation:
it's the only answer that have double displacement
tell me if it was right
why is there no base unit for volume
Answer: Volume. Litre (L) and millilitre (mL) are non-SI units, but because they are easier to write and pronounce, they are in common use.
Explanation: I think the explanation is the answer also
What is the mass in grams of 0.0015 mol of aspirin (C9H8O4)
Answer:
116.1 g
Explanation:
Answer:
Answer is 0. 508grams I'm not sure if I'm right but it might be the answer.
Hydrogen and nitrogen combine to form ammonia. When nitrogen and hydrogen bond, nitrogen pulls the electrons from hydrogen toward itself. Which statement about the reactants is correct?
A)Hydrogen is oxidized, and nitrogen loses electrons.
B)Hydrogen gains electrons, and nitrogen is reduced.
C)Hydrogen is reduced, and nitrogen is oxidized.
D)Hydrogen is oxidized, and nitrogen is reduced.
The correct option s D.
Because from the reaction of hydrogen and nitrogen to form ammonia, Hydrogen is oxidized, nitrogen is reduced.
Therefore, Nitrogen gas is the oxidizing agent and hydrogen gas is the reducing agent.
This is called a redox reaction
Redox reaction is a chemical reaction in which electrons can move from one atom to another leading to change of oxidation states.
In this reaction nitrogen gas act as an oxidizing agent and hydrogen gas actsas a reducing agent.
N2+3H2 = 2NH3
(g). (g)
From the reaction, oxidation number of nitrogen is 0 on the reactants' side to
3.
The decrease in the oxidation number of nitrogen indicate that it is being reduced.
On the other hand, the oxidation number of hydrogen move from on the reactants' side to +1 on the products' side. This increase in the oxidation number of hydrogen indicate that hydrogen is oxidized.
Therefore, nitrogen gas is reduced to ammonia and hydrogen gas is oxidized to ammonia
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Is an egg(Not hard-boiled) an Element, Compound, or Mixture
Answer:
compound
Explanation:
(it comes from a living animal and is not mixed with things)
please help!!!
The sky is blue because blue light is scattered in the sky. What does
scattering mean?
A. dust particles are refracting light
B. dust particles are absorbing light
C. dust particles are transmitting light
D. dust particles are reflecting light
B. dust particles are absorbing light
Explanation:When light travels through a medium, it interacts with the medium and this causes the scattering of light. - Photons are absorbed by molecules in the medium, and this causes the molecules to vibrate and then re-emit the photons. ... - The scattering of light increases with frequency
Answer:
C
Explanation:
the answer is C. dust particels are reflecting light. hope this helps
The main difference between a suspension and a colloid is that:
1) In colloids, the solute is permanently dissolved in the solvent.
2) In suspensions the particles eventually settle to the bottom.
3) In colloids the particles eventually settle to the bottom.
Answer:
IThink
Explanation:
i think is optional 2
A solution of the weak acid HA is prepared by dissolving 2.60 g of HA in 100.0 mL water. The solution is titrated, and the equivalence point is reached after 32.6 mL of 0.500 M NaOH is dispensed. Calculate the molar mass of HA.
Answer:
Dude! this is crazy but ill help
Explanation:
The answer is 76.4 milimeters
The molarity of the weak acid HA can be calculated from the volume and molarity of NaOH by which the number of moles of HA can be calculated. From the number of moles and a weight of 2.60 g, the obtained molar mass 159.50 g/mol
What is molarity?Molarity of of solution is the number of solutes per volume of solution in liters. In a titration, the product volume and molarity of the titrant is equal to the product of volume and molarity of the analyte.
The volume and molarity of NaOH is given 32.6 ml and 0.500 M. The molarity of 100 ml of weak acid HA is calculated as follows:
Molarity of HA = (32.6 ml × 0.500 M) /100 ml
= 0.163 M.
From the molarity the number of moles of HA can be calculated by multiplying molarity with volume in liter.
number of moles = molarity × volume
= 0.163 M × 0.1 L.
= 0.0163 moles.
It is given that the weight of HA is 2.60 g. Thus molar mass can find out by dividing the weight by number of moles.
molar mass of HA = 2.60 g/ 0.0163 moles
= 159.50 g/mol.
Hence, the molar mass of the weak acid HA is 159.50 g/mol.
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chemists use solution concentration units to
3. Explain how the body uses electrolytes to regulate fluid balance. Describe Acid-base balance in the body.
Answer:
Explanation:
1 Electrolytes, particularly sodium, help maintain fluid balance through osmosis. Osmosis is a process where water moves through the wall of a cell membrane from a dilute solution (more water and fewer electrolytes) toward a more concentrated solution (less water and more electrolytes).
2 acid base balance in the body
our body's pH balance, also referred to as its acid-base balance, is the level of acids and bases in your blood at which your body functions best. The human body is built to naturally maintain a healthy balance of acidity and alkalinity. The lungs and kidneys play a key role in this process.
classification of animals is done why
Answer:
in order to reduce and simplify the study of the animals
to be able to group animals in their appropriate groups
Explanation:
when we classify organisms that means that we take a large number of organisms and group them to a single and correct group that will help the scientists across the world to identify organisms easily
