The phase change that results in an increase in entropy is the change; Br2(1) - Br2(g)
What is entropy?The term entropy refers to the degree of disorderliness in a system. We have to note that gases have a higher entropy than liquids and liquids have a higher entropy than the solids.
As such, the phase change that results in an increase in entropy is the change; Br2(1) - Br2(g)
Learn more about entropy:https://brainly.com/question/12786977
#SPJ2
A sample of lithium has a mass of 0.0624 grams. How many atoms are present in this sample?
Answer:
[tex]5.412*10^{23}[/tex]
Explanation:
We can find the moles of lithium by doing 0.0624 divided by the molar mass of lithium (which is 6.941). Then, we can multiply that number by 6.02*10^23 which is the avogadro number. Then, we get our answer.
Sustainable forestry is managing forests so they harvested regularly without harming or reducing the future supply of timber. What is one practice you might observe in a sustainably-managed forest?
A) clear cutting
B) selective cutting
C) land reclamation
D) crop rotation
Answer:
I think option D
I hope my answer is helpful to you
please give me five star rating
Compare ionic, covalent, and metallic bonds based on each's strength
Answer:
Covalent bond involves the sharing of electrons, while metallic bonds have strong attractions and ionic bonds involve the transferring and accepting of electrons from the valence shell. The adhering property of an atom, in order to arrange themselves in a most stable pattern by filling their outermost electrons orbit
Explanation:
hope it helps:)
As you are cleaning out the shared refrigerator in the kitchen of your apartment at the end of the school year, you find an unlabeled, clear plastic container in the back, left there by one of your roommates. This container is half-filled with something that you notice has separated into two layers: the top one is a dark yellow color, the bottom layer is more greenish. You assume that this biphasic mixture has an aqueous layer and some type of organic layer. Without tasting, smelling, or removing either layer from the container, how can you determine which layer is the aqueous layer using just material found in a typical kitchen
Answer:
See explanation
Explanation:
The organic layer is always found at the top of the mixture while the aqueous layer is found at the bottom of the mixture.
Therefore, if I use any piece of rod and an empty container found in the kitchen to perform a simple decantation, the top layer that comes out first is the organic layer. The other layer that remains after the top layer has been successfully decanted is the aqueous layer.
Quickly please! Which is a group of tissues that work together to carry out a common function?
cell
organ
organelle
organ system
• What information would you need in order to predict whether transfer of thermal
energy would occur when two objects or materials interact?
Answer:
The temperature of the objects involved.
Explanation:
In order to know whether thermal energy will occur, it is important to consider the temperature of the objects involved.
"Heat" is normally being transferred from an object that is warmer to an object that is cooler. For example, a lighted candle will transfer its heat to a cooler object lying next to it. This is because the molecules in the lighted candle have higher kinetic energy, which means the molecules are moving fast and are colliding with each other. Thus, it is easier for the molecules to transfer to the area with cooler temperature.
This difference in temperature is essential in order for the thermal energy transfer to occur.
The branch of science which deals with chemicals and its bond is called chemistry.
The correct answer to the question is temperature.
"Heat" is normally being transferred from an object that is warmer to an object that is cooler and this property is known as heat transferring.
For example - a lighted candle will transfer its heat to a cooler object lying next to it and it also transfers the heat to the wax beneath it due to which wax of candle melt due to increases in temperature.This is because the molecules in the lighted candle have higher kinetic energy, which means the molecules are moving fast and are colliding with each other. Thus, it is easier for the molecules to transfer to the area with a cooler temperature.
This difference in temperature is essential in order for the thermal energy transfer to occur.
For more information, refer to the link:-
https://brainly.com/question/25026730
Unknown element has two isotopes. Isotope A has a mass of 34 amu and abundance of 52%, isotope B has a mass of 33 amu and abundance of 48%. Find average atomic mass of this element and express your
Answer:
x = 33.52 amu
Explanation:
It is given that,
Isotope A has a mass of 34 amu and an abundance of 52%, isotope B has a mass of 33 amu and an abundance of 48%.
Let x is the average atomic mass of this element. It can be calculated as follows :
[tex]x=52\%\ \text{of}\ 34+48\%\ \text{of}\ 33\\\\x=\dfrac{52}{100}\times 34+\dfrac{48}{100}\times 33\\\\x=0.52\times 34+0.48\times 33\\\\x=33.52\ \text{amu}[/tex]
So, the average atomic mass of this element is 33.52 amu.
2. Why would a calcium (Ca) atom be larger than a bromine (Br) atom even
though they both have 4 energy levels? *
Within a period, the atom size decreases with increasing group number (from left to right), since the nuclear charge and the number of external electrons increase within the period, but the number of shells does not. The electrons are more strongly attracted to the nucleus and are therefore closer to the nucleus.
I
•
What would happen if a person who is wearing a heavy winter jacket were to
place a thermometer inside the jacket next to his or her skin? What would
happen if we took the same jacket, after it had been hanging in a closet, and
placed a thermometer inside?
Answer:
When the thermometer was placed next to the skin, it should be higher because of the heat your body gives off, and the jacket trapping the heat in, when you put it in the closet it will be cooler due to not having a heat source.
when a neutral atom gains or loses electrons, it becomes charged and is called a
Answer:
Ion
Explanation:
Answer:
Conclusión. Los cationes son iones con carga positiva que se forman cuando los átomos neutros pierden electrones; los aniones son iones con carga negativa que se forman cuando átomos neutros ganan electrones.
Explanation:
Five moles of sulfur dioxide, soz, would consist of how many molecules?
molecules
Need Help?
Answer:
3 x 10²⁴ molecules
Explanation:
A mole is just a name that we use to substitute a number, just like a dozen means 12, a mole means 6.022 x 10²³. This gives us the unit conversion of 6.022 x 10²³ molecules SO₂/1 mol SO₂.
[tex]5molSO2*\frac{6.022 x 10^2^3molecules}{1mol SO2} = 3.011 x 10^2^4moleculesSO2[/tex]
Round to the lowest number of significant figures to get 3 x 10²⁴ molecules SO₂
Why does the correct lewis structure of Co2 involve a double bond between each of the oxygen atoms and the carbon atom
Answer:
Because both carbon and oxygen are demanded to obey the octet's rule.
Explanation:
Hello.
In this case, recalling the Lewis dot structure of CO₂ which is basically:
[tex]O:=:C:=:O[/tex]
We know oxygen has six valance electron whereas carbon four valence electrons, it means that oxygen needs two electrons in order to attain eight electrons and carbon needs four electrons for the same purpose. In such a way, as carbon dioxide contains one carbon atom and two oxygen atoms we infer that each oxygen is providing two electrons for a total of four to allow the carbon obey the octet as well as oxygen and this is attained via two double bonds.
Best regards.
Suppose you produce 0.0451 g of N 2 gas with a volume of 0.0413 L and a pressure of 0.991 atm at 298 K. Based on the experimental data, what is the value of the gas constant R ?
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore, value of the gas constant R is 0.0821LatmK⁻¹ when volume is 0.0413 L.
What is ideal gas equation?
Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of nitrogen gas = 0.991 atm
V= volume of nitrogen gas =0.0413 L
n =number of moles of nitrogen gas = given mass ÷Molar mass
=0.0451 g ÷28
=0.0016mol
T =temperature of nitrogen gas =298 K
R = Gas constant =?
0.991 atm×0.0413 L=0.0016×R×298 K
R=0.0821LatmK⁻¹
Therefore, value of the gas constant R is 0.0821LatmK⁻¹.
To learn more about ideal gas equation, here:
https://brainly.com/question/14826347
#SPJ2
Assume that pure water coexists with its vapor at some temperature in a closed container. What are chemical potentials in water and in vapor and their main contributions in both phases
A certain compound is made up of three chlorine atoms, one phosphorus atom, and one oxygen atom. What is the chemical formula of this compound
Answer:
POCl3
Explanation:
A compound is a substance made up of atoms of different elements. The number of atoms each element posseses make up the chemical formula of the compound. In this question, a certain compound is made up of three chlorine atoms (Cl3), one phosphorus atom (P), and one oxygen atom (O).
Combining these atoms of different quantity together, this means that the compound will have a chemical formula: POCl3. This compound is called phosphorus oxychloride.
Someone plz hello me ASAP it would be appreciated on question 7 btw
Answer:
Kinetic Energy is the correct Answer.
Explanation:
At the highest point on the roller coaster (assuming it has no velocity), the object has a maximum quantity of gravitational potential energy. As the object begins moving down to the bottom, its gravitational potential energy begins to decrease and the Kinetic Energy starts to increase.
he concentration of H2S in a saturated aqueous solution at room temperature is approximately 0.1 M. Ka1=8.9x10-8 Ka2=1.0x10-19 Calculate the pH of the solution in 2 sig figs
Answer:
PH = 4.0
Explanation:
We are given;
Ka1 = 8.9 × 10^(-8)
Ka2 = 1.0 × 10^(-19)
From the 2 values of K given above, we can see that Ka2 is far smaller than Ka1.
Thus, Positive hydrogen ion (H+) will be majorly formed from first dissociation which is Ka1.
Now, the breakdown of the H2S solution is;
H2S⇌[H+] + [HS−]
Thus;
Ka1 = [[H+] × [HS2^(-)]]/(H2S)
HS2^(-) also has a positive hydrogen ion.
Thus, we can rewrite as;
Ka1 = [[H+] × [H+]]/(H2S)
Ka1 = (H+)²/(H2S)
Concentration of H2S is given as 0.1M. Thus;
8.9 × 10^(-8) = (H+)²/0.1
(H+)² = 0.1 × 8.9 × 10^(-8)
(H+) = √(0.1 × 8.9 × 10^(-8))
(H+) = 0.00009433981
Now, PH is gotten from;
PH = -log (H+)
Thus;
PH = -log 0.00009433981
PH ≈ 4.0
The oxidation of glucose to carbon dioxide and water is represented by the following reaction, whether the oxidation occurs by combustion in the laboratory or by biological oxidation in living cells: C6H12O6+6O2⇌6CO2+6H2O When combustion is carried out under controlled conditions in the laboratory, the reaction is highly exothermic, with an enthalpy change (ΔH) of −673kcal/mol. As you know, ΔG for this reaction at 25∘C is −686kcal/mol, so the reaction is also highly exergonic. Part A Explain what the ΔH and ΔG values mean. What do the negative signs mean in each case? Drag the terms on the left to the appropriate blanks on the right to complete the sentences. Terms can be used once, more than once, or not at all.
Answer:
See explanation
Explanation:
∆H is known as the change in enthalpy. When the change in enthalpy is negative, it simply means that heat is given out during the reaction. Therefore, we refer to the reaction as an exothermic reaction.
Similarly, ∆G is known as change in free energy. When the change in free energy is negative, it implies that the reaction is spontaneous as written. This is called an exergonic reaction.
Which 2 main body systems work alongside the digestive system?
Calculate the mass of glucose metabolized by a 60.0 −kg person in climbing a mountain with an elevation gain of 1550 m . Assume that the work performed in the climb is about four times that required to simply lift 60.0 kg by 1550 m . (ΔfH∘ of C6H12O6(s) is -1273.3 kJ/mol.) w = mgh (mass in kg, g = 9.8 m/s2, h in meters)
Answer:
Mass of glucose = 515.34 g
Explanation:
We are given;
Mass; m = 60 kg
Elevation; h = 1550 m
Acceleration due to gravity; 9.8 m/s²
Now, work performed to lift 60kg by 1550m is given by the formula;
W = mgh
W = 60 × 9.8 × 1550
W = 911400 J
We are told the actual work is 4 times the one above.
Thus;
Actual work = 4W = 4 × 911400 = 3,645,600 J
Now,
Molar mass of Glucose(C6H12O6) = 180 g/mol
We are given standard enthalpy of combustion = -1273.3 KJ/mol = -1273300
Moles of glucose = 3645600/1273300 = 2.863mol
Mass of glucose = 2.863 mol × 180 g/mol
Mass of glucose = 515.34 g
Calculate the freezing point of a solution containing 10 grams of KCl and 1100.0 grams of water. The molal freezing point depression constant (Kf) for water is 1.86
Answer:
- 0.454 °C
Explanation:
From the given information:
The mass of KCl = 10 grams
The molar mass of KCl = 74.55 g/mol
The molality can be calculated as:
[tex]Molality \ m = \dfrac{mass \ of \ KCl \times 1000}{molar \ mass \ of \ KCl \times 1100.0}[/tex]
[tex]Molality \ m = \dfrac{10 \ g \times 1000}{74.55 \ g/mol \times 1100.0}[/tex]
Molality m = 0.1219 M
For freezing point depression;
[tex]\Delta T_R = i \times k_f \times m[/tex]
The van't Hoff's Factor (i) for KCl = 2
The molar depression of freezing point constant [tex]k_f[/tex] = 1.86° C/m
∴
[tex]\Delta T_R = 2 \times 1.86 \times 0.1219[/tex]
[tex]\mathbf{\Delta T_R = 0.454^0\ C }[/tex]
However, the freezing point of water is known to be = 0°C
Therefore, the freezing point of the solution
= 0 °C - 0.454 °C
= - 0.454 °C
THIS IS TIMED!! PLEASE HELP A student has about 250 mL of the liquid acetone. She wants to get a precise and accurate measure of the actual volume of the liquid without losing any. Which of these would be the best instrument to use. 500 mL graduated cylinder (±1mL) 100 mL graduated cylinder (±0.5mL) 250 mL beaker (±5mL) 500 mL beaker (±7mL)
Answer:
500 mL graduated cylinder (±1mL)
Explanation:
Several laboratory glasswares are used in the laboratory, which serves different functions. They include: beakers, volumetric flask, Erlenmeyer flask etc. Beakers are flat-based glasswares used majorly for storing and mixing chemical solutions. Some beakers are also used to measure liquids.
However, graduated cylinders are tall flasks that has graduated markings on it, hence, it is majorly used for measuring liquids. According to this question, a student wants to get a precise and accurate measure of the actual volume of acetone liquid, which is about 250mL.
To do this, the best instrument she can use is a 500 mL graduated cylinder (±1mL). This is because the graduated cylinder holds enough space to contain the liquid and measure it with a level of accuracy better than beakers.
identify which statement is true
Answer:
I'm sorry to say but there is no statements in this question meaning no one will be able to answer them with out them.. what are the statements?
Explanation:
plz help on both I will mark brainest and explain how you got it
Answer:
as much as i can see i think it goes like this?:
1.H202--> H20+02
Answer is 2,2,1 bc
1.when you add 2 to H202 its 2H202 so H is 4 and O is 4,
2.when you add 2 to H20 its 2H20 so H is 4 and O is 2 (so H is done and good on both sides we have 4 H)
3. and then when you add 1 to O2 its still O2 you dont need to add anything bz when you add the 2O from 2H2O with O2 its 4 O so everything's good (i explained it a bit messy so you can message me if you got questions)
2. Ag20->Ag+ O2
answer is 2,4,1
1.when you add 2 to Ag2O2 it becomes 2Ag2O (so Ag is 4 and O is 2)
2. you add 4 to Ag bc on the left side when you added 2 Ag became 4 so now its equal on both sides (they're both 4)
3.you add 1 (basically dont add anything bc you dont write 1 just leave it as O2) bc on left side you got O2 and the same on right side (if you got questions message me:))
Which factor is most important to keep the same when looking at the
meniscus to compare the surface tension of different liquids?
A. The intensity of light
B. Type of container
C. Temperature
D. Type of material
Answer:
b. the type of container
Explanation:
Answer:
The type of container
Explanation:
Just took the test
Which of the following does not represent a compound?
NaCl
N20
CO2
O2
Answer:
O2
Explanation:
A compound is made of two or more chemical elements. With that in mind, O2 is only one element: oxygen.
Answer:
D. O2
Explanation:
First, let’s define a compound.
A compound is a substance made when 2 or more elements are chemically combined in a fixed ratio.
Now, let’s examine the answer choices.
A. NaCl
• This has sodium (Na) and chlorine (Cl) so it is a compound.
B. N2O
• This has nitrogen (N) and oxygen (O). This is a compound.
C. CO2
• This has carbon (C) and oxygen (O) so this is also a compound.
D. O2
• This only has oxygen (O). A compound needs two or more elements, so this is not a compound.
Therefore, the correct answer is D. O2
If3.91 potassium metal is
allowed to react with oxygen,
O2, the reaction yields 7.11g of k2o.
How much oxygen was reacted?
Assume that the inspired air is dry air. The vapor pressure of 47 mmHg at 37°C corresponds to a volume and mass of liquid water. If the tidal volume is 500 mL and respiration rate is 12 min−1, how much water is lost from the body per day? Would you expect this to increase or decrease with activity?
Answer:
Water lost per day will be "378 g".
Explanation:
The volume of air expired per a day will be:
= [tex]12\times 500[/tex]
= [tex]8640 \ L[/tex]
As we know,
The ideal gad law equation will be:
⇒ [tex]PV = nRT[/tex]
⇒ [tex](\frac{47}{760} )\times 8640= n\times 0.082\times 310[/tex]
⇒ [tex]n=21\times 18[/tex]
⇒ [tex]n=378 \ g[/tex]
PLEASE I NEED HELP WITH CHEMISTRY PLEASE ????????
There's no question..
Point N is on line segment MO. Given NO = 2x – 3, MO = 3x + 5, and
MN = 2x + 3, determine the numerical length of MO.
Answer:
MO = 20
Explanation:
Given that: MO = 3x + 5
MN = 2x + 3
NO = 2x - 3
But,
MO = MN + NO
So that;
3x + 5 = (2x + 3) + (2x - 3)
3x + 5 = 2x + 3 + 2x - 3
3x + 5 = 4x
3x - 4x = -5
-x = -5
Multiply through by minus,
x = 5
Thus,
MO = 3x + 5
= 3(5) + 5
= 15 + 5
MO = 20
The length of MO is 20.
