Answer:
The number of liters) the boy exhales is 0.499744 liters
Explanation:
The given parameters of how the boy breathes;
The number of moles of gas the boy exhales, n = 0.02231 moles
The condition in which the boy exhales the gas = STP = Standard Temperature and Pressure
The molar volume of a gas at STP, [tex]V_m[/tex] = 22.4 L per mole
Therefore, the volume of gas the boy exhales, 'V', is give as follows;
V = n × [tex]V_m[/tex]
By substituting the known values, we have;
V = 0.02231 moles × 22.4 L/mole = 0.499744 L
The volume of gas (the number of liters) the boy exhales, V = 0.499744 L.
29. Which of the following is not a physical change?"
A) iron melting
B)food rotting
C)breaking a glass
D)shredding paper
Answer:
B food rotting
Explanation:
Food rotting is chemical change
If an element has three isotopes with known natural abundance percentages,
what other information is needed to find the average atomic mass of the
element?
A. The average mass of the isotopes
B. The atomic number of each isotope
C. The mass of each isotope
D. The sum of the masses of the isotopes
1. (04.01 LC)
Which of the following is an example of how science can solve social problems? (5 po
It cathstop excessive rain from occurring.
It can identify the sources of polluted water.
It can control the time and day when cyclones happen.
It can reduce the frequency of severe weather conditions.
2. (04.01 LC)
Science is used to stop things the are incrediblu diffucult to deal with therefore jeg spiser ikke dreng
The answer is
It can identify the sources of polluted water.
Which one of the following substances will have hydrogen bonding as one of its intermolecular forces?
a
о
Нc— c— СТ.
Oь
o=
H— С—Н
нан
H— C— N
н н
н
0
1
— С—С
1
н н
Answer:
Explanation:
hc-- c--ct
The correct answer is option A: CH3COCH3
Hydrogen bonding occurs when hydrogen is directly bonded to a highly electronegative atom.
Hydrogen bonding is one of the intermolecular interactions. It occurs only when hydrogen is bonded to a very electronegative atom in a molecule. Hydrogen bonding can occur between two molecules of the same type(intermolecular hydrogen bonding) or within the same molecule (intra molecular hydrogen bonding). In either case, the bonding is polar as hydrogen is attached to the electronegative atom via a non-covalent bonding interaction.
Looking at the structures in the question attached, CH3COCH3 does not have any hydrogen atom directly attached to a highly electronegative atom hence CH3COCH3 does not exhibit hydrogen bonding.
Hydrogen bonding in water is shown in the image attached.
For more about hydrogen bonds, see
https://brainly.com/question/10904296
Genevieve and Alden each filled a plastic jug half-full of room temperature water. Genevieve put her jug on a sunny windowsill. Alden put his jug in a cool cupboard. After two hours, what did they observe?
Answer:
After two hours, it is observed that Genevieve's Jar has less water than that of Alden.
Explanation:
The water in Genevieve's Jar didn't disappear. It was not drunk by the birds, it simply evaporated. Evaporation is what happens to liquid when they are heated. Water has three states: Solid (that is Ice), Liquid (that is the water which was put in the jar), and gas (vapor).
When water is exposed to heat sources like the sun, its molecules vibrate faster and escape into the atmosphere in form of vapor if the container has an opening.
When this happens for a prolonged period of time, the amount of water in the jar or container becomes less and less in volume.
This is not the case for the jar that was stored in a cool place where the water molecules remained stable.
Cheers
Which ingredient would a company that makes super-sour candy most likely use in large quantities?
nitric acid
zinc hydroxide
citric acid
calcium hydroxide
Answer:
Citric acid
Explanation:
Answer:
On edge it is C or option 3 citric acid
Explanation:
A car advertisement states that a certain car can accelerate from rest to 70 km/h in 7 seconds. Find the car’s average acceleration.
Answer:
1 : 10
Explanation:
For every second the car accelerates 10km/h
Helium is an unreactive gas and neon is a gas of extremely low reactivity.what if anything do their atom have in common?
Answer:
It belongs to the last group with all the gas whose last shell are common and they are unreactive unlike to other elements which reacts to complete there last shell with total 8 electrons . Helium and Neon have in common that they have there shell complete and they reacts very less or they don't.
Explanation:
Hope it is helpful....
How many liters are in 75.0 grams of nitrogen gas at STP?
Answer:
60 liter
Explanation:
mass =75 gm
no of mole =75/28
now volume = 22.4 * 75/28 =60
Guys please I need an answer for this asap
Mg+2HCl -> MgCl+H2
0.2 mole of mg reacted with 0.2 of HCl
What is the mass of hydrogen gas produced?
8. Which element is most likely to form an ions with a +3 charge?
Li
Sr
Kr
Fe
Answer:
Fe
Explanation:
A carbon-oxygen double bond in a certain organic molecule absorbs radiation that has a frequency of 6.00 x 1013 s-1. What is the wavelength of this radiation? To what region of the spectrum does this radiation belong? What is the energy of this radiation per photon? Per mole of photons? A carbon-oxygen bond in a different molecule absorbs radiation with a frequency equal to 5.40 x 10^13 s^-1. Is this radiation more or less energetic?
Answer:
5.0X10 -6 M-
Explanation:
The second radiation is less energetic than the former because it has a longer wavelength.
Recall that;
c = λf
c = Speed of light
λ = wavelength
f = Frequency
Now;
λ = c/f = 3 × 10^8 m/s/6.00 x 10^13 s-1
λ = 5 × 10^-6 m
Also;
When f = 5.40 x 10^13 s^-1
λ = c/f = 3 × 10^8 m/s/5.40 x 10^13 s^-1
λ = 5.6 × 10^-6 m
This radiation is less energetic than the former because it has a longer wavelength.
Learn more: https://brainly.com/question/10038290
is neutralizing a base, physical or chemical property?
Answer:
I think it is chemical because neutral makes me think of acidity, which is a chemical property.
The rate of motion or the speed of an object is commonly expressed in.
What mass of water would be produced if 1.5 g of ethanoic acid was reacted completely with sodium hydroxide (3 marks)
Mass of water : 0.45 g
Further explanationGiven
1.5 g ethanoic acid
Required
Mass of water
Solution
Reaction
CH₃COOH + NaOH ⇒H₂O + CH₃COONa
mol CH₃COOH(MW=60 g/mol) :
= mass : MW
= 1.5 : 60
= 0.025
mol H₂O from the equation :
= 0.025(mol ratio CH₃COOH : H₂O= 1 : 1)
Mass of water :
= mol x MW water
= 0.025 x 18 g/mol
= 0.45 g
Which of the following is physical change!?
a. dissolving
b. evaporating
c. bending
d. all of the above
To Become or cause to become incorporated into a liquid so as to form a solution.
Evaporation:The process of changing from liquid to vapour.
Bending:To shape or force something straight, in a curve or angle.
___________________________________
Alcohols are flammable, suggest how the mixture of alcohols should be safely heated so that ethanol can be collected
Guys help me pls
Which of type of elements are mainly gases at room temperature, dull and
brittle with low melting points?
Using the mass of baking soda that you used this lab, calculate the theoretical (expected) yield of NaCH3COO in grams ?
Mass of baking soda - 4.5 g
Answer:
4.4 g
Explanation:
The equation of the reaction is;
NaHCO3 (aq) + CH3COOH (aq) ----> CO2 (g) + H2O (l) + CH3COONa (aq)
Mass of baking soda - 4.5 g
Molar mass of NaHCO3 = 84.007 g/mol
Number of moles of baking soda= 4.5 g/84.007 g/mol = 0.0536 moles
If 1 mole of NaHCO3 yields 1 mole of CH3COONa
0.0536 moles of NaHCO3 also yields 0.0536 moles moles of CH3COONa
Hence;
Theoretical yield of CH3COONa = 0.0536 moles * 82.0343 g/mol = 4.4 g
3.50M solution? Show your work!
What is the molarity of these solutions? Show your work!
a. 3.5 mol HBr in 500 mL of water
b. 0.0750 mol NaCl in 250.0 mL of water
c. 1.95 mol AgNO3 in 1.2 L of water
d. 0.500 mol NH3 in 2.5 L of water
Answer:
a number is correct answer 9
Must all species reproduce in order for the species to survive? *
Answer:
no
Explanation:
Considering the activity series given for nonmetals, what is the result of the below reaction? Use the activity series provided. F > Cl > Br > I Br2 + NaF
Answer:
no reaction will occur.
Explanation:
The term ''activity series'' in chemistry is used to describe the series of metals and non metals arranged in an orderly manner of reactivity which is usually arranged from the most active elements to the least reactive elements.
So, from the question we are given that F > Cl > Br > I. This means that Fluorine, F is the most reactive element in this group of non metals[group seven in the periodic chart/table], while the least reactive element is the Iodine, I.
Hence, Cl, Br and I can not displace F in any chemical reaction since they are less reactive as compared to F.
Therefore, the reaction; Br2 + NaF will not occur because Bromine can not displace Fluorine. Fluorine is more reactive than Bromine
Answer:
A
Explanation:
EDGE
How does Gregor Mendel's work with pea plants affect human life today?
O A. People continue to cross pea plants to fix Mendel's many experimental mistakes.
B. People use Mendel's knowledge of DNA and chromosomes to create new species.
O C. People use the strains of pea plants that Mendel developed as a major food source.
D. People continue to selectively breed plants and animals to produce predictable results.
Answer:
D. People continue to selectively breed plants and animals to produce predictable results.
Explanation:
Gregor Mendel's work with pea plants affect human life today as a result of his ability to produce different results and genetic composition of pea plants through his crossing methods.
This laid the foundation for people today to continue to selectively breed plants and animals to produce predictable results which has lots of advantages associated with it.
Calculate the second volumes. 980 L at 71 C and 107.2 atm to 13 C and 59.3 atm
The second volume : V₂= 1472.9 L
Further explanation
Given
980 L at 71 C and 107.2 atm
13 C and 59.3 atm
Required
The second volume
Solution
T₁ = 71 + 273 = 344 K
P₁ = 107.2 atm
V₁ = 980 L
P₂ = 59.3 atm
T₂ = 13 + 273 = 286 K
Use combine gas law :
P₁V₁/T₁ = P₂V₂/T₂
Input the value :
107.2 x 980/344 = 59.3 x V₂/286
V₂= 1472.9 L
how the word triads coined in chemistry by johann dobereiner??
Answer:
In the history of the periodic table, Döbereiner's triads were an early attempt to sort the elements into some logical order by their physical properties. In 1817, a letter reported Johann Wolfgang Döbereiner's observations of the alkaline earths; namely, that strontium had properties that were intermediate to those of calcium and barium.[1] By 1829, Döbereiner had found other groups of three elements (hence "triads") whose physical properties were similarly related.[2] He also noted that some quantifiable properties of elements (e.g. atomic weight and density) in a triad followed a trend whereby the value of the middle element in the triad would be exactly or nearly predicted by taking the arithmetic mean of values for that property of the other two elements.
What electrical energy converted inside a toaster?
Choices:
A. thermal energy and light
B. nuclear energy
C. chemical energy
D. kinetic energy
FOR BRAIN
Answer:
A. Thermal enerfy and light
Explanation:
Answer:
A
Hopefully this helped! :D
-LavenderVye
If today is October 12th and we view a first quarter, on what date will we observe the next third quarter? i need help asap i will give 15 points
Answer:
It would be October 15th
Explanation:
How would you name the number:100 liters?
A. Dekaliter
B. Hectoliter
C. Centiliter
D. Megaliter
E. Other
Answer:
E
Explanation:
In one type of cell division, a single cell forms two new cells. This process is called mitosis. What is a reason that human skin cells frequently undergo mitosis?
Answer:
Explanation:
probably C
Describe the function of the PNS and
the CNS.
Answer: PNS, CNS is
Periferal nervous system. Central nervous system.
Explanation:
