Among the given substances, the substance which will solidify before the temperature reaches 0°C is benzene.
What is freezing point?Freezing point of any liquid is that point at which the liquid will convert into solid state at the normal atmospheric pressure.
Among the given substances butane and nitrogen has freezing point less than 0°C, water has 0°C and benzene has more than 0°C. When we cool down the temperature of the container before the 0 degree celsiuc than the beaker in which benzene is present cools gradually.
Hence benzene will solidify before the temperature reaches 0°C.
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(Element or Compound)
C2H30
Answer:
Compound
Explanation:
An element is just like Carbon by itself but when theres more than one element it is a compound.
Answer:
C2H3O is a compound as it is formed when three elementscarbon, hydrogen, oxygen) react together
NaOH + HF --> NaF + H2O If you are given 3 moles of HF at the beginning of the reaction, how many moles of NaF will be produced?
Answer:
NaOH+HF-------NaF+H2O
1 mole Of HF=1mole of NaF
3mole HF= X
X=3mole of NaF
If 36.5 m of a gas are collected at a pressure of 755 mm Hg, what volume will the gas
occupy if the pressure is changed to 632 mm Hg?
Answer:
Is there any answer options?, if not the answer is V2= 43.6m3
"The volume of the gas is calculated Boyles law. If 36.5 m of a gas are collected at a pressure of 755 mm Hg, then the volume of the gas will be 43.6 [tex]m^{3}[/tex]"
What is Boyles Law?
Boyle's law, also known as the Boyle–Mariotte law or Mariotte's law, would be an experimental gas law that specifies that how pressure of a gas decreases as the container capacity increases.
It can be represented by the formula:
[tex][P_{1} V_{1} =P_{2} V_{2}[/tex]
It is given that, [tex]P_{1}[/tex]= 755 mmHg, [tex]P_{2}[/tex] = 632 mm Hg, [tex]V_{1}[/tex]= 36.5[tex]m^{3}[/tex]. [tex]V_{2}[/tex]= ?
Now, put the value of given data in above formula:
[tex]V_{2}[/tex] = 755× 36.5/632= 43.6 [tex]m^{3}[/tex] .
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The basic unit of every living thing is the ________________.
Question 1 options:
Atom
Molecule
Cell
Proton
Answer:
Cell
Explanation:
Cell is the smallest and basic unit of life
Which of the following occurrence indicates that a chemical reaction has taken place?
a. An odor is produced by burning a sugar cube.
b. A puddle is produced by melting an ice cube.
C. A loud noise is produced by crushing a can.
d. A shard of glass is produced by breaking a bottle.
Describe the structure or shape of DNA
Answer:
a double helix structure
Explanation:
a two-stranded molecule that appears twisted, giving it a unique shape referred to most commonly as the double helix structure
How do astronomers observe and learn about celestial
objects?
Answer:
Astronomers use a number of telescopes sensitive to different parts of the electromagnetic spectrum to study objects in space. Even though all light is fundamentally the same thing, the way that astronomers observe light depends on the portion of the spectrum they wish to study.
Explanation:
The percentage of salicylic acid is 60.78% carbon 4.38% hydrogen and the rest is oxygen calculate the empress formula of salicylic acid
Answer: c2h2o
Explanation:
An advantage of using renewable energies is? 1.They are harmful to the environment 2.We have a limited supply of them 3.They allow us to take energy from natural processes
Answer:
3. They allow us to take energy from natural processes
Explanation:
There are two major sources of energy namely: renewable and non-renewable. Renewable sources of energy are those natural sources that gets replenished faster than they are utilized, which is contrary to non-renewable sources. Examples of renewable sources of energy are wind energy, solar energy, hydro (water) energy.
According to the question, one advantage or merit that renewable sources have over their counterparts is that they allow us to take energy from natural processes e.g. wind, sunlight etc.
what is the difference between a Stalagmite and a stalactite?
Answer:
A stalagmite is a type of rock formation that rises from the floor of a cave due to the accumulation of material deposited on the floor from ceiling drippings. Stalagmites are typically composed of calcium carbonate, but may consist of lava, mud, peat, pitch, sand, sinter and amberat.
and a stalactite means mineral formation that hangs from the ceiling of caves, hot springs, or man-made structures such as bridges and mines. Any material that is soluble and that can be deposited as a colloid, or is in suspension, or is capable of being melted, may form a stalactite.
what factors affect freezing-point depression of a solution? (select all that apply)
a. Freezing-point of solute
b. vant hoff of the solvent
c. molal freezing-point depression constant
d. molarity of the solution
e. vant hoff of the solution
f. freezing point of the solvent
g. molality of the solution
Answer:
A and F i think
Explanation:
Freezing point depression is a colligative property observed in solutions that results from the introduction of solute molecules to a solvent. The freezing points of solutions are all lower than that of the pure solvent and is directly proportional to the molality of the solute
Molality of the solution and the Van"t Hoff of the solution affects the freezing-point depression of a solution.
Recall that the formula for freezing point depression is given by;
ΔT = K m i
Where;
T = freezing-point depression of a solution
K = freezing-point constant
m = molality of the solution
i = Van't Hoff factor
We can see two important variables in this equation which are;
Molality of the solution Van"t Hoff of the solutionThese two variables affect the freezing-point depression of a solution.
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What is the following reaction?
Answer:
Decomposition
Explanation:
Decomposition is when the molecules split apart
AB --> A + B
2H2O3 --> H2O + O2
how does the chlorine atom attain a stable octet in each of the preceding cases
Answer:
where is the question i can't see it
This is due today and I’m so confused, if you know any of the answers, please help me out. Thank you!
What is SI unit of volume
Answer:
The SI unit of volume is m³
Metal or Non-metal?
Potassium: metal
Fluorine:
Bromine:
Hydrogen
Beryllium:
Nitrogen
Answer:
Fluorine:non-metal
Bromine:non-metal
Hydrogen:non-metal
Beryllium:metal
Nitrogen:non-metal
A ninja motorbike travelling at 55 m/s takes 10 sec to come to rest . What is its deceleration rate ?
Answer:
Speed=Distance
Time
Explanation:
The mass ratio of H:S:O in sulfuric acid today is 1:8:32. Predict the mass ratio of sulfuric acid in 23th century.
In the 23rd century, the mass ratio of H:S:O in sulfuric acid will remain 1:8:32.
Law of definite proportionsWe know from the law of definite proportions that irrespective of the path through which a chemical compound is obtained, it has a fixed composition by mass.
As such, the composition of a chemical substance does not vary. Therefore, in the 23rd century, the mass ratio of H:S:O in sulfuric acid will remain 1:8:32.
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What is the molarity of a solution that
contains 20.0 g of KOH dissolved in 1.25
L?
Answer:
0.40m
Explanation:
A sample of Ar(g) is contained in a
cylinder with a moveable piston at an initial
temperature of T. The volume of the
sample is decreased from 4.5 L to 1.5 L
while the pressure is held constant, as
shown in the diagram below.
Answer:
Option (B) is correct.
Explanation:
Initial temperature of the gas is T.
The volume of the sample is decreased from 4.5 L to 1.5 L while the pressure is held constant.
At constant pressure, the relation between volume and temperature is given by :
[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
Here, V₁ = 4.5 L, V₂ = 1.5 L, T₁ = T₁, T₂ = ?
So,
[tex]T_2=\dfrac{V_2T_1}{V_1}\\\\T_2=\dfrac{1.5\times T_1}{4.5}\\\\T_2=\dfrac{T_1}{3}[/tex]
So, the final temperature of the gas is [tex]\dfrac{T_1}{3}[/tex]. Hence, the correct option is (B).
Plzzzz helppp this submits in 5 minutes plzzzzz helpppp meeeee
List five predictions of climate change and the effects on earth by the year 2100
Answer:
Predictions:
1. Half of the world will be cold and the other half will be hot, which will cause unbalanced state of climate on Earth.
2. The whole world will start to get hotter and there will be no winters or rain which causes water shortage, unable to grow crops. Polar ice is melting is an example.
3. Floods can come, because water level in sea is rising and it could kill all of us.
4. Earthquake can occur because in the Bible Jesus tells about earthquakes, etc at the second coming of Jesus.
Explanation:
How does the digestive system work with the muscular system?
A: Digestive System gets nutrients (good) from food and hands it over to the blood and Circulatory System then carries those
nutrients where they need to go.
B: It doesn't
C: The enteric nervous system's network of nerves, neurons and neurotransmitters extends along the entire digestive tract - from
the esophagus, through the stomach and intestines, and down to the anus.
D: The muscular system allows for movement within the body, for example, during digestion or urination.
Answer:
the answer is not d because you can pee without moving. so its a because without the food nutrient no part of our body can work
A scientist observes that the electrical resistance of a superconducting material drops to zero when the material is cooled
to very low temperatures. Which of the following statements best describes what the scientist is observing?
*
O The scientist is observing the electrical power of a superconductor.
• The scientist is observing the temperature of a superconductor.
O The scientist is observing an intensive property of a superconductor.
iS O The scientist is observing an extensive property of a superconductor.
Mark this and return
Next
Submit
Answer:
The scientist is observing an intensive property of a superconductor.Explanation:
This is the answer because no matter how much of the superconductor material is present the resistance of the superconducting material still drops to zero when the material is cooled to very low temperatures
Which phrase defines altitude?
how tightly molecules are packed
a column of air pushing on an area
the force pushing on an area or a surface
the height of a given point above sea level
How does the moon's physical characteristics make it easier for scientists to study than the sun?
Responses
A. The moon is closer to Earth so it is easier to see and visit.
B. The moon is solid so it is easier for astronauts to visit.
C. The moon is not as bright as the sun so it is easier to view through a telescope.
D. All of the other answer choices
2.Earth completes one rotation every 24 hours. The moon completes one rotation about every 28 days. How are the day/night cycles different on the moon and on Earth?
Responses
A. The moon's day/night cycle takes 28 days instead of 24 hours.
B. On the moon, it is always daytime.
C. On the moon, it is always nighttime.
D. The moon has a week/month cycle instead of a day/night cycle.
Scientists noticed that climate changes on Earth cycled through about every 11 years. The scientists realized the changes were affected by the sun. Which feature of the sun causes these Earth climate changes?
Responses
A. None of the other answer choices
B. Solar flares
C. The corona
D. Sunspots
Answer:
1st question: The moon is closer to Earth so it is easier to see and visit.
2nd question: The moon has a week/month cycle instead of a day/night cycle.
3rd question: The corona
Explanation:
Will somebody be my g i r l f r i e n d.
Plzz no guys answer yes
Answer:
yo, for some advice, dont be desperate for a girl, girls dont like desperate boys, how do i know that? because i got a gf.
Explanation:
Which are factors that affect the rate of chemical reactions? Select all that apply.
1.concentration
2.weight
3.temperature
4.surface area
Temperature and surface area are factors that affect the rate of chemical reactions. Hence, options C and D are correct.
What is temperature?Temperature is the measure of hotness or coldness expressed in terms of any of several scales, including Fahrenheit and Celsius.
The rate of a chemical reaction is affected by several parameters. Reactions involving two phases proceed more rapidly when there is greater surface area contact.
If the temperature or reactant concentration is increased, the rate of a given reaction generally increases as well.
Hence, options C and D are correct.
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Please Help
All matter has physical and chemical properties. These properties can be used to identify the type of matter. Which of these statements describes a chemical property?
Select one:
a. A metal is added to a beaker of water, a gas is formed, and the beaker explodes.
b. A certain heavy metal turns to a liquid at room temperature.
c. A 2-feet-long metal bar has a mass of only 176 g.
d. A particular substance evaporates at 30 °C.
Can someone answer this asap!! All I know is 188g is incorrect!
Answer:
db gb bg
Explanation:
Cuando haces ejercicios abdominales estas realizando un trabajo. Si haces el mismo numero de abdominales en la mitad de tiempo que acostumbras, ¿como seria tu rendimiento en terminos de potencia comparandolo con el tiempo normal en que las haces?
Answer:
El rendimiento seria mayor ya que la potencia aumenta.
Explanation:
La potencia aumenta cuando determinado trabajo se realiza en menor cantidad de tiempo.