Answer:
eek um A.The substance(s) to the left of the arrow in a chemical equation are called reactants. The substance(s) to the right of the arrow is called products.
Explanation:
What must a scientist do in order to develop a testable hypothesis?
O A. Be certain that the data collected will fully support the hypothesis.
B. Find out whether the hypothesis can also explain untestable
claims.
C. Make sure that no other scientist has investigated the topic
before.
O D. Determine whether it is possible to gather the necessary data.
Answer:
A
Explanation:
Be certain that the data collected will fully support the hypothesis
Answer: D. Determine whether it is possible to gather the necessary data.
What is the molar mass of CHCl3?
48.47 g/mol
83.92 g/mol
119.37 g/mol
121.39 g/mol
119.37 g/mol
Further explanationRelative atomic mass (Ar) and relative molecular mass / molar mass (M)
the molar mass/molecular mass of a compound : the sum of the relative atomic mass (Ar) of the constituent atoms
M AxBy = (x.Ar A + y. Ar B)
Atomic weight (Ar) of :
C : 12.0107 g/mol H : 1.00784 g/mol Cl : 35.453 g/molThe molar mass of CHCl₃
[tex]\tt CHCl_3=12.0107+1,00784+(35,453\times 3)=119.37~g/mol[/tex]
The molar mass of [tex]CHCl_3[/tex] (chloroform) is 119.37 g/mol. Therefore, the correct option is C.
The organic compound chloroform, which has the molecular formula [tex]CHCl_3[/tex], is well known for its use as a solvent and anaesthetic. It consists of three chlorine atoms (Cl), one hydrogen atom (H), and one carbon atom (C).
The molar mass of carbon (C) is approximately 12.01 g/mol, the molar mass of hydrogen (H) is approximately 1.01 g/mol, and the molar mass of chlorine (Cl) is approximately 35.45 g/mol. We add up the molar masses of all the individual atoms to determine the molar mass of [tex]CHCl_3[/tex]:
(1 * molar mass of C) + (1 * molar mass of H) + (3 * molar mass of Cl)
(1 * 12.01 g/mol) + (1 * 1.01 g/mol) + (3 * 35.45 g/mol)
12.01 g/mol + 1.01 g/mol + 106.35 g/mol
The molar mass of [tex]CHCl_3[/tex] is approximately 119.37 g/mol.
Therefore, the correct answer is C.
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A gaseous mixture consisting of nitrogen, argon, and oxygen is in a 3.5-L vessel at 25C. Determine the number of moles of oxygen if the total pressure is 98.5kPa and the partial pressure of nitrogen and argon are 22.0kPa and 50.0kPa, respectively.
Answer:
Number of moles of oxygen = 0.037 mol
Explanation:
Given data:
Total pressure = 98.5 KPa
Partial pressure of nitrogen = 22.0 KPa
Partial pressure of argon = 50.0 KPa
Volume = 3.5 L
Temperature = 25°C (25+273= 298K)
Number of moles of oxygen = ?
Solution:
Total pressure = P(N₂) + P(O₂) + P(Ar)
98.5 KPa = 22.0 KPa +P(O₂) + 50.0 KPa
98.5 KPa = 72.0 KPa +P(O₂)
P(O₂) = 98.5 KPa - 72.0 KPa
P(O₂) = 26.5 KPa
KPa to atm:
26.5 KPa/ 101 = 0.262 atm
Number of moles of oxygen:
PV = nRT
n = PV/RT
n = 0.262 atm × 3.5 L / 0.0821 atm.L/mol.K × 298 K
n = 0.917atm.L /24.47atm.L/ mol
n = 0.037 mol
The solid obtained at the neck of a funnel in sublimation is called....................?(mixture)
Answer:
Sublimate
Explanation:
The solid obtained at the neck of a funnel in sublimation is called the sublimate.
This substance is a solid.
Sublimation process is a phase change. In this process, a solid is directly changed to gas or gas changed to solid. Heat must be added to change the solid to gas and heat removed for the reverse process. Not all substances have this capability.i need help with this one pls, ty! ASAP
Answer:
Explanation:
1. A measure of how quickly velocity is changing is the acceleration
Acceleration is the rate of change of velocity with time. The rate at which a body is changing its velocity is known as the acceleration.
It is measured in the unit m/s²
2. Speed in a given direction is the velocity
Velocity is a vector quantity which measures the magnitude of motion in a specific direction. It is simply speed in a given direction.
When we say a motorcycle travels at the rate of 5m/s due east, we are describing the velocity of such body.
3. Force that resists moving one object against another is the friction
Friction is a force that opposes motion. It prevents a body from moving.
4. Measure of the pull of gravity on an object Weight
Weight is a measure of the amount of gravitational force on a body. It is mathematically expressed as;
W = mg
W is the weight, m is the mass and g is the acceleration due to gravity
5 Tendency of an object to resist a change in motion is inertia
Inertia is the tendency of body to resist change in motion. It is the ability of a body to remain in a perpetual state of rest.
6 Size is the magnitude
Calculate the pressure of the CO₂ (g) in the container at 425 K.
The pressure of the CO₂ = 0.995 atm
Further explanationThe complete question
A student is doing experiments with CO2(g). Originally, a sample of gas is in a rigid container at 299K and 0.70 atm. The student increases the temperature of the CO2(g) in the container to 425K.
Calculate the pressure of the CO₂ (g) in the container at 425 K.
Gay Lussac's Law
When the volume is not changed, the gas pressure is proportional to its absolute temperature
[tex]\tt \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]
P₁=0.7 atm
T₁=299 K
T₂=425 K
[tex]\tt P_2=\dfrac{P_1\times T_2}{T_1}\\\\P_2=\dfrac{0.7\times 425}{299}=0.995 `atm[/tex]
Why is it important to know the weather?
Answer:
so you can dress based on how hot or cold it's gonna be outside
which two elements are most likely to have similar physical properties?
pls help:)
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, sodium and potassium are the two element most likely to have similar physical properties.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
The chances are high that sodium and potassium share both physical and chemical characteristics. They are both members of the Alkali metals family. Both are extremely reactive and share the same valence electrons. The elements in the same group have same physical and chemical properties.
Therefore, sodium and potassium are the two element most likely to have similar physical properties.
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oxygen wants to lose two electrons which results in a +2 charge. is that true or false
Answer:
false
Explanation:
electronic configuration of oxygen is 2,6 that means it has 6 electrons in its last shell. but it can hold 8.so it is unstable so to be stable oxygen needs another 2 electrons so that it becomes 8 ( 6 + 2 = 8 )
so oxygen takes 2 electrons which result in -2
Describe the relationship between the solubility rate of a gas and temperature.
25 points
Answer:
as temperature increases, solubility of gas decrease
what is the molar mass of tin (IV) sulfide
Answer:
182.81 g/mol
Explanation:
Would a drop of food coloring spread color more quickly throughout a container of
hot water or cold water? Why?
Answer:
I believe it’s hot water.
Explanation:
Drops of food coloring placed in hot water will spread color faster than drops of food color in cold water because the particles will move faster at higher temperatures.
I like someone but I don't know how to actually talk to em. HELP!
Answer:
tell how you feel
Explanation:
don't be afraid to express your feeling.
Answer:
slowly approach them and tell your feelings
(Help) when nearly vertical rays of solar energy strike a region of the earth that area has warm temperatures what region of the earth gets nearly vertical rays of solar energy year around?
A) United States
B) Australia
C) North and South Poles
D) Equator
Answer:
D) The equator
Explanation:
To solve this we must be knowing each and every concept related to solar energy. Therefore, the correct option is option D among all the given options.
What is solar energy?Sun energy is the term for solar radiation that may create heat, trigger chemical processes, or create electricity. The total solar energy incidence on Earth is far greater than the global energy needs at the now and in the future.
Although sunlight is unquestionably the most potent energy source that Earth receives from the Sun, its intensity at the surface of the planet is really rather modest. When nearly vertical rays of solar energy strike a region of the earth that area has warm temperatures. Equator is the region of the earth that gets nearly vertical rays of solar energy year around.
Therefore, the correct option is option D.
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will mark BRAINLIEST!!
Explanation:
i think it is a polar bond but I am not sure
Answer:
i believe it forms a covalent bind by sharing the electrons, so closest would be Ionic
The boiling point of water (H2O) is 100 °C. Which of the following best predicts the boiling point of hydrogen sulfide (H2S)? (5 points)
Answer:
Boiling point of H2S is (-60.2 C°)
Explanation:
This is very less than water because hydrogen bonding is present in water that is absent in H2S
HElP PLS!! 20 points Which statement best describes a characteristic unique to renewable resources?
Renewable resources are abundant.
Renewable resources form slowly.
Renewable resources can be used to generate electricity.
Renewable resources are found in nature.
Answer:
renewable resources are abundant???
Answer:
renewable resources are abundant!
Explanation:
Where did the word "atom" come from?
ancient Greece of 400 B.C.there was a brilliant philosopher named Democritus, and he proposed the Greek word atomos, which means uncuttable. And so as he explained, all matter was eventually reducible to discrete, small particles or atomos.
5.00 g zinc added to hudroclric acid what is the mass of hydrogen gas
Answer:
0.15g
Explanation:
Given parameters:
Mass of Zn = 5g
Unknown:
Mass of hydrogen gas = ?
Solution:
To solve this problem, we must first write the reaction expression;
Zn + 2HCl → ZnCl₂ + H₂
Now find the number of moles of the known specie which is Zn;
Number of moles of Zn = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of Zn = 65.4g/mol
Number of moles of Zn = [tex]\frac{5}{65.4}[/tex] = 0.08mole
1 mole of Zn will produce 1 mole of H₂
0.08 mole of Zn will give 0.08 mole of H₂
Mass of H₂ = number of moles x molar mass
molar mass of H₂ = 2(1) = 2g/mol
Mass of H₂ = 0.08mol x 2g/mol = 0.15g
How are monosaccharides and polysaccharides structurally different? *NO PLAGIARISM PLS*
Explanation:
Monosaccharides are simple carbohydrates that cannot be further hydrolyzed to simpler carbohydrates. They contain between three and six carbon atoms per molecule.
Polysaccharides are complex carbohydrates . They are condensation polymers derived from very long chains of monosaccharide units.
Structurally, polysaccharides are made up of repeating units of monosaccharides.
What might happen to the cryosphere if the insulating effect of the atmosphere increased?
Answer:
Acting like a highly reflective blanket, the cryosphere protects Earth from getting too warm. Snow and ice reflect more sunlight than open water or bare ground. Changes in snow and ice cover affect air temperatures, sea levels, ocean currents, and storm patterns all over the world.
Explanation: Hope this answers your question
How many aleles are there for the four main types of human blood?
one
two
three
four
Answer:
three alleles
Explanation:
WILL GIVE BRAINLIEST
Answer:
1 Mole
Explanation:
1 mole is equal to 1 moles NH4, or 18.03846 grams.
Between 1975-1980 the wolf population seems to be higher that can be supported by the moose population. What might account for this ?
Answer:
The mooses have been decreasing for quite some time. The wolves have been a cause of this. They have attacked moose for many years because of there DNA and there normal instincs. The wolf population seems to be higher during 1975-1980 because they have been able to Increase more in population due to being able to get food from the moose. That is how the wolf population icreasing accounts for the wolf population Decreasing.
Explanation:
I took a test on this last year. I clearly remember the answer and got 100 on the test. So, I dearly hope this helps.
what is newton law with examples
Answer:
there are three types of law
newton first, second and third law
which law you asked.
Explanation:
Need Help!!Atomic Structure escape room. Enter 4 digit code(no spaces)
Answer:
9146
Explanation:
The letters are in the place of the number on the clock. A is in the place of 9, B is in the place of 1, and so on. I hope I was correct!
Answer:
9641
Explanation:
If the work function of tin (Sn) is 281 nm, what equation could you use to determine the amount of energy required to eject a photoelectron from a sample of tin?
Answer:
See explanation
Explanation:
The work function is given by;
Wo = hc/λ
where;
h = 6.6 * 10^-34 Js
c = 3 * 10^8 ms-1
λ = 281 nm or 281 * 10^-9 m
Wo = 6.6 * 10^-34 * 3 * 10^8 / 281 * 10^-9
Wo = 7.0 * 10^-19 J or 4.375 eV
Note that the work function is the minimum energy required to eject an electron from a sample of tin.
Is science btw HELP Question 1 What is the significance of a standard system of measurement?
A: Scientists from around the world need a way to share data they can all understand.
B: Every Country has its own set of measurement standards.
C: Scientists come from different cultural backgrounds.
D: The language spoken in different countries are different.
Question 2 Which of the following is the SI unit used by chemists to measure the amount of an element or substance?
A: Millimeter
B: Molecule
C: Atom
D: Mole
Question 3 Which is a measurement of distance that is used around the world?
A: 24 feet
B: 30 miles
C: 500 meters
D: 16 kilograms
Question 4 A centimeter is __________ meter(s)
A: 1,000
B: 100
C: 1/100th
D: 1/1000th
Question 5 Which of the following is equivalent to 140 centiliters
A: 14.0 milliliters
B: 1.4 deciliters
C: 0.00140 kiloliters
D: 0.140 liters
Answer:
b
Explanation:
Aluminium is produced by electrolysis of a molten mixture.
What two substances does the molten mixture contain??
Answer:
cryolite and oxide
Explanation:
The molten mixture contain what is referred to as cryolite and aluminium oxide in electrolytic production of aluminium.
What is an Electrolyte?This is a chemical substance which when dissolved in water conducts electricity.
The aluminium oxide and cryolite mixture are involved in the production of aluminium with carbon dioxide being given off.
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What are the effects of UV radiation from the sun when it is absorbed by the skin
Answer:
A common effect of UV radiation is erythema or sunburn.
Explanation:
This happens when skin cells are damaged by the absorption of energy from UV rays.
Answer:
A common effect of UV radiation is erythema or sunburn.
Explanation:
This happens when skin cells are damaged by the absorption of energy from UV rays.