Solutions that are very concentrated have greater freezing point depression Group of answer choices true or false
Answer:
Explanation:
False. The greater the concentration, the lower the freezing point.
How much energy is needed to heat 2 kg of cooking oil with a specific heat capacity of 2000 from 20 to 120
Answer:
20KJ
Explanation:
We know that heat required to raise the temperature of substance is given by
thermal energy Q= mass(m) × specific heat capacity(c) × change in temperature.(ΔT)
Q = mcΔT
given data: mass m = 2kg , c = 2000j/Kg°C and ΔT = 120-20 =100°C
Therefore, Q = 2×2000×100 = 20000 J = 20KJ
Hence, 20KJ heat is required to to heat 2 kg of cooking oil with a specific heat capacity of 2000 from 20 to 120 [ Units have been assumed as per convenience)
WILL GIVE 50 points I can’t get on to the website so plz help.
Explanation:
can you tell us what do want help with?
Answer:
Ok I will give you answer
Calcula la densidad del gas a TPE para los siguientes: 969cm3 de un gas 64 grados C y 96.4 kPa con una masa de 1.64g
Respuesta:
2.17 × 10⁻³ g/cm³
Explicación:
Paso 1: Información provista
Volumen inicial (V₁): 969 cm³Temperatura inicial (T₁): 64 °CPresión inicial (P₁): 96.4 kPaVolumen en TPE (V₂): ?Presión estandar (P₂): 100 kPaTemperatura estandar (T₂): 273.15 KPaso 2: Convertir 64 °C a Kelvin
Usaremos la siguiente fórmula.
K = °C + 273.15 = 64 °C + 273.15 = 337 K
Paso 3: Calcular V₂
Usaremos la ecuación combinada de los gases ideales.
P₁ × V₁ / T₁ = P₂ × V₂ / T₂
V₂ = P₁ × V₁ × T₂ / T₁ × P₂
V₂ = 96.4 kPa × 969 cm³ × 273.15 K / 337 K × 100 kPa = 757 cm³
Paso 4: Calcular la densidad del gas a TPE
A TPE, 1.64 g del gas ocupan 757 cm³.
ρ = 1.64 g/757 cm³ = 2.17 × 10⁻³ g/cm³
N. 39.8 g HzF to L. unit convert
Answer: 39.9 g HzF is equivalent to 0.0398 L.
Explanation:
According to the standard conversion factor,
1 gram = 0.001 L
Therefore, 39.8 g will be converted into liter as follows.
[tex]1 g = 0.001 L\\39.8 g = 39.8 g \times \frac{0.001 L}{1 g}\\= 0.0398 L[/tex]
Thus, we can conclude that 39.9 g HzF is equivalent to 0.0398 L.
The wording of these questions are confusing how would you set this up ?
The formula is m1v1=m2v2
Answer:
8. 171074.8 mL
9. 3475 mL.
Explanation:
8. Determination of the volume of the diluted solution.
Initial Molarity (M₁) = 14 M
Initial volume (V₁) = 523 mL
Final Molarity (M₂) = 0.0428 M
Final volume (V₂) =?
Using the dilution formula, we can obtain the volume of the diluted solution as follow:
M₁V₁ = M₂V₂
14 × 523 = 0.0428 × V₂
7322 = 0.0428 × V₂
Divide both side by 0.0428
V₂ = 7322 / 0.0428
V₂ = 171074.8 mL
Therefore, the volume of the diluted solution is 171074.8 mL
9. Determination of the volume of water added.
We'll begin by calculating the final volume of the solution. This can be obtained as follow:
Initial Molarity (M₁) = 3.2 M
Initial volume (V₁) = 973 mL
Final Molarity (M₂) = 0.7 M
Final volume (V₂) =?
M₁V₁ = M₂V₂
3.2 × 973 = 0.7 × V₂
3113.6 = 0.7 × V₂
Divide both side by 0.7
V₂ = 3113.6 / 0.7
V₂ = 4448 mL
Thus, the final volume of the solution is 4448 mL
Finally, we shall determine the volume of water added. This can be obtained as follow:
Initial volume (V₁) = 973 mL
Final volume (V₂) = 4448 mL
Volume of water added =?
Volume of water added = V₂ – V₁
Volume of water added = 4448 – 973
Volume of water added = 3475 mL
how much heat is required to increase the temperature of 20 grams of water by 26 degrees celsius?
Answer: 2175.68 J heat is required to increase the temperature of 20 grams of water by 26 degrees celsius.
Explanation:
Given: Mass = 20 g
Change in temperature = [tex]26^{o}C[/tex]
The standard value of specific heat of water is [tex]4.184 J/ g^{o}C[/tex]
Formula used to calculate the heat energy is as follows.
[tex]q = m \times C \times \Delta T[/tex]
where,
q = heat energy
m = mass of substance
C = specific heat of substance
[tex]\Delta T[/tex] = change in temperature
Substitute the values into above formula as follows.
[tex]q = m \times C \times \Delta T\\= 20 g \times 4.184 J/g ^{o}C \times 26^{o}C\\= 2175.68 J[/tex]
Thus, we can conclude that 2175.68 J heat is required to increase the temperature of 20 grams of water by 26 degrees celsius.
A sample of gas is inside of a rigid container with fixed volume of 350mL. The initial pressure of the system is 366kPa, and the initial temperature is 88 degrees Celsius. How would the pressure of the system change if the temperature was increased to 110 degrees Celsius?
Answer:
457.5kPa
Explanation:
Given data
V1=V2=350mL (fixed volume )
P1=366kPa
T1= 88 degrees Celsius
P2=??
T2= 110 degrees Celsius
For the general gas equation
P1V1/T1= P2V2/T2
V1=V2
P1/T1= P2/T2
Substitute
366/88= P2/110
Cross multiply we have
P2*88=366*110
P2*88= 40260
P2= 40260/88
P2= 457.5 kPa
Hence the pressure will change to 457.5kPa
ALEX RODE HIS BIKE
60 km in 4 Hours. How FAST WAS HE GOING
Answer:
15 km/hour
Explanation:
You need to find how fast he was going per hour.
Answer: 15
Divide. 60 ÷ 4
This gives us 15. So, Alex was going 15 mph
A .3 piece of copper is heated and fashioned into a bracelet. The amount of energy transferred by heat to the copper is 63500 J. If the specific heat of copper is 390 J/g degrees celsius, what is the temperature change during this process
Answer:
600k
Explanation:
6300j//390j/g
=600k
The diagram below represents the bone
arrangements in the front limbs of three different
species of mammals.
The similarities and differences in these limbs
suggest that all three species developed from the
same ancestor, but
Answer:
these species share a common ancestor
Explanation:
answer truthfully:))
Answer:
Formula: [tex]Velocity \: V = f \lambda \\ Solution: = 5 \times 0.8 \\ = 4 \: {ms}^{ - 1} [/tex]
Answer:
The first guy is correct. That's what I got too
When fluorine gas is put into contact with calcium metal at high temperatures, calcium fluoride powder is created in an exothermic reaction
Answer:
True,When fluorine gas is put into contact with calcium metal at high temperatures, calcium fluoride powder is created in an exothermic reaction.
If I have an unknown quantity of gas at a pressure of 0.72 atm, a volume of 22
liters, and a temperature of 30° C, how many moles of gas do I have?
Answer:
0.64 mol
Explanation:
Using ideal gas equation as follows;
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
According to the information provided in this question;
P = 0.72atm
V = 22 L
T = 30°C = 30 + 273 = 303K
n = ?
Using PV = nRT
n = PV/RT
n = (0.72 × 22) ÷ (0.0821 × 303)
n = 15.84 ÷ 24.88
n = 0.64 mol
Why does the chloride ion have a charge of -1
Explanation:
As we know that chloride ion is halogen. So it has seven valence electrons in its valence shell. Hence it gains one electron from others during chemical reaction to be stable. So Chloride ion have a negative charge of -1.
Hope it will help :)❤
What is the half-life of a radioisotope if a 20 g sample becomes 5 g after 2 days?
Answer: A- 1 day
Explanation: I really hope that helped. BYE!!
1 day is the half-life of a radioisotope if a 20 g sample becomes 5 g after 2 days
Go to the To Scale tab at the bottom of the simulation, and select Path from the central menu on the right. Set up a Planet-Moon simulation. Use the sliders to make both the planet and the moon as massive as possible, and then begin the simulation. What do you notice about the moon’s motion when it is closest to the planet? What about when it is farthest away?
When it could be closest to the Earth and farthest from it, the Moon passes the fastest as well as the slowest.
What is Earth?The only cosmic object known to contain life is Earth, which would be located third from the Sun. Although the Solar System contains enormous amounts of water, only Earth is home to liquid surface water. The oceans cover over 71% of Earth's crust, dwarfing its polar ice, lakes, including rivers.
What is moon?The sole natural satellite of Earth would be the Moon. It makes up the Earth-Moon satellite system with Earth. Its diameter is equivalent to one-fourth of Earth. It should be the biggest satellite of a planet compared to the main, bigger than any existing dwarf planet, as well as the fifth biggest satellite in the Planetary System.
When sliders to make both the planet and the moon as massive as possible, and then begin the simulation. they noticed, it could be closest to the Earth and farthest from it, the Moon passes the fastest as well as the slowest.
To know more about Earth and Moon
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This is Science
How does the process of photosynthesis help the overall life on earth? (Hint: what does it produce that living things need to live?)
Answer: Photosynthesis requires sunlight, carbon dioxide, and water as starting reactants (Figure 5.5). After the process is complete, photosynthesis releases oxygen and produces carbohydrate molecules, most commonly glucose. These sugar molecules contain the energy that living things need to survive.
Explanation:
Hydrogen gas and nitrogen gas come together to form ammonia. If 25.0 g of nitrogen is mixed with hydrogen, what volume of hydrogen is needed to complete the reaction? (grams to volume)
Answer:
60.0L of hydrogen are needed
Explanation:
Based on the reaction:
3H₂ + N₂ ⇄ 2NH₃
3 moles of hydrogen react 1 mole of nitrogen.
To solve this question we have to find the moles of nitrogen. With the moles of nitrogen we can find the moles of hydrogen. Using PV = nRT at STP conditions we can find the volume as follows:
Moles Nitrogen -Molar mass: 28g/mol-
25.0g N₂ * (1mol / 28g) = 0.893 moles N₂
Moles hydrogen:
0.893 moles N₂ * (3mol H₂ / 1mol N₂) = 2.679 moles H₂
Volume hydrogen:
PV = nRT
V = nRT / P
Where V is volume in liters,
n are moles of the gas: 2.679 moles
R is gas constant: 0.082atmL/molK
T is absolute temperature: 273.15K at STP
P is 1atm at STP
Replacing:
V = 2.679mol*0.082atmL/molK*273.15K / 1atm
V =
60.0L of hydrogen are needed
What does a -ΔT mean?
Answer:
Decreased change in temperature
Explanation:
Delta T signifies the temperature is changing, but by adding a negative, it specifies that it changes by decreasing.
There are 1 1/2 times the amount of
we need on the planet today
What type of bond would be formed between nitrogen (N) and nitrogen (N)? Why?
an ionic bond because there is less than a 0.4 difference in electronegativity between the atoms
a polar covalent bond because there is less than a 0.4 difference in electronegativity between the atoms
a nonpolar covalent bond because there is less than a 0.4 difference in electronegativity between the atoms
Answer: The compound formed between nitrogen (N) and nitrogen (N) a polar covalent bond because there is less than a 0.4 difference in electronegativity between the atoms.
Explanation:
If electronegativity difference between two atoms is less than 0.4 then bond formed is a pure covalent bond.
If electronegativity difference between two atoms is between 0.4 to 1.8 then bond formed is a polar covalent bond.
If electronegativity difference between two atoms is greater than 1.8 then bond formed is an ionic bond.
The electronegativity value of a nitrogen atom is 3.04. Hence, the electronegativity difference of [tex]N_{2}[/tex] molecule is as follows.
[tex]Electronegativity difference = electronegativity value of N - electronegativity value of N\\= 3.04 - 3.04\\= 0[/tex]As the electronegativity difference is 0 which is less than 0.4.
Hence, we can conclude that the compound formed between nitrogen (N) and nitrogen (N) a polar covalent bond because there is less than a 0.4 difference in electronegativity between the atoms.
For the reaction of C 2H 4( g) with O 2( g), to form CO 2( g) and H 2O( g), what number of grams of CO 2 could be produced from 2.0 g of C 2H 4 and 5.0 g of O 2?
Answer:
4.58g of CO₂ could be produced
Explanation:
Based on the reaction:
C₂H₄(g) + 3O₂(g) → 2CO₂(g) + 2H₂O(g)
1 mole of C₂H₄ reacts with 3 moles of oxygen to produce 2 moles of CO₂
To solve this question we must find the moles of each reactant in order to find limiting reactant. With limiting reactant we can find the moles -And the mass- of CO₂ produced:
Moles C₂H₄ -Molar mass: 28.05g/mol-
2.0g * (1mol / 28.05g) = 0.0713moles
Moles O₂ -Molar mass: 32g/mol-
5.0g * (1mol / 32g) = 0.156moles
For a complete reaction of 0.0713 moles of C2H4 are required:
0.0713 moles C₂H₄ * (3 moles O₂ / 1 mol C₂H₄) = 0.214 moles of O₂
As there are just 0.156 moles, O₂ is limiting reactant.
The moles of CO₂ produced are:
0.156 moles O₂ * (2mol CO₂ / 3mol O₂) = 0.104 moles CO₂
The mass is -Molar mass CO₂: 44.01g/mol-
0.104 moles CO₂ * (44.01g / mol) =
4.58g of CO₂ could be producedWhich two radioisotopes have the same decay mode?
A)220Fr and 60C0
B)37K and 42K
C)37Ca and 53Fe
D)99Tc and 19Ne
Answer:
c
Explanation:
37Ca and 53Fe have the same decay mode.
What are the three common modes of radioactive decay?Three of the most common types of decay are alpha decay (α-decay), beta decay (β-decay), and gamma decay (γ-decay), all of which involve emitting one or more particles.
Which isotopes are most likely to decay?The most likely mode of decay for a neutron-rich nucleus is one that converts a neutron into a proton. Every neutron-rich radioactive isotope with an atomic number smaller than 83 decays by electron emission. C, 32P, and 35S, for example, are all neutron-rich nuclei that decay by the emission of an electron.
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A student combines 20.0 grams of hydrogen and 20.0 grams of oxygen in a reaction. According to the law of conservation of mass, how many grams of water should be produced?
A)20.0grams B)40.0grams C)30.0grams D)10.0grams
Answer:
A)20.0grams
Explanation:
Answer:
10
Explanation:
A sample of gas with a volume of 5.0 m3 at a temperature of 298 K and a pressure of 0.84 atmospheres is left in a closed container where the temperature increases to 323 K and the pressure increases to 0.89 atmospheres. What is the new volume of a gas sample?
Answer:
5.12 m³
Explanation:
Using the combined gas law formula as follows:
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (atm)
P2 = final pressure (atm)
V1 = initial volume (m³)
V2 = final volume (m³)
T1 = initial temperature (K)
T2 = final temperature (K)
According to this question;
V1 = 5.0 m³
V2 = ?
P1 = 0.84 atm
P2 = 0.89 atm
T1 = 298 K
T2 = 323 K
Using
P1V1/T1 = P2V2/T2
0.84 × 5/298 = 0.89 × V2/323
4.2/298 = 0.89V2/323
Cross multiply
4.2 × 323 = 298 × 0.89V2
1356.6 = 265.22V2
V2 = 1356.6 ÷ 265.22
V2 = 5.12 m³
If energy was added to solid, what state would it change to
A. Super solid
B. Plasma
C. Liquid
Answer:
Explanation:
The answer is C Liquid
What is the specific heat of a metal (in J/g℃) that weighs 150 g and absorbs 1.2 kJ (or 1,200 J) of heat when the temperature rises by 50.0℃?
Answer:
0.16 J/g℃
Explanation:
We have the following data:
heat = 1,200 J
mass of metal = m = 150 g
change in temperature = ΔT = 50.0℃
The heat absorbed is calculated by using the following equation:
heat = m x Cp x ΔT
So, we introduce the data in the equation to calculate the specific heat of the metal (Cp), as follows:
Cp = heat/(m x ΔT) = (1,200 J)/(150 g x 50.0℃) = 0.16 J/g℃
Project: Communicating Design Details
Answer:
Do you have an idea that you want the design to be about? if you do I can help! if not I can give you ideas you can try to work with and you can tell me if theyre good or not.
Explanation:
kaillie was talking and was distracted as she stirred sugar into her tea. when she finally noticed, there was a few crystals of sugar in the bottom of her cup that would not dissolve. what type of tea solution did kaillie?
a. unsaturated
b. saturated
c. supersaturated
d. cannot be determined
Answer:
Supersaturated
Explanation:
The tea has absorbed and dissolved as much sugar as it could. If there is sugar left at the bottom, it means the solution is supersaturated because it can't absorb any more.