Answer:
we cant see the list
Explanation:
Why do we feel the heat from the sun even though it is far away from Earth?
O The sun is farther away from Earth than any other star.
The sun is closer to Earth than any other star.
O The sun is the largest star.
O The sun is the brightest star.
Answer:
B.) The sun is closer to Earth than any other star.
Kevin is working on a model that shows the positions of Earth, the Moon, and the Sun during the phases of the Moon. How should he position them to show a New Moon?
There are ___________ of different kinds of proteins in the human body?
Answer:
In humans, up to ten different proteins can be traced to a single gene. Proteome: It is now estimated that the human body contains between 80,000 and 400,000 proteins. However, they aren't all produced by all the body's cells at any given time. Cells have different proteomes depending on their cell type.
Explanation:
Proteins are macromolecules that are complex structures made of monomeric units. There are 20,000 - 60,000 different kinds of proteins in the human body.
What are proteins?Proteins have been the large molecules (macromolecules) that are structurally composed of the monomers or the smaller units. They have been composed of amino acids.
The amino acids are produced by the translational process and are linked by the peptide bonds. They are the most essential compound for the cellular and physical activity of the cells in living organisms.
The proteome is used to identify and classify the various proteins that can range from 20,000 - 60,000 in a human body. These proteins are involved in performing the functions in the body.
Therefore, approximately 20,000 - 60,000 proteins are found in the human body.
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What is an Oxidizing Agent? ( answer in simple language)
Answer:
an agent that helps accept electrons on others like oxygen, halogens
Explanation:
a substance that tends to bring about oxidation by being reduced and gaining electrons.
Please mark me as brainliest
Describe Write your own caption for this photo.
Will give brainliest
Answer:
2 hard working men fix water spout for the community
The volume occupied by a certain mass of methane gas (CH4)
at STP is 420 L. What will be its mass in grams at STP?
a
500 g
b 400 g
C 300 g
d None of the above
Answer: 300 g
Explanation: I guessed and got it right
420 liter of volume is occupied by 300 grams of methane gas at standard temperature and pressure (STP).
How we write the ideal gas equation at STP?Ideal gas equation of methane gas at STP (standard temperature pressure) can be written as:
PV = nRT, where
P = pressure = 1 atm
V = volume = 420 L (given)
R = universal gas constant = 0.082 L.atm / k.mole
T = absolute temperature = 273 K
n = no. of moles to find?
Putting all these values in the above equation and calculated for the n:
n = (1 × 420) / (0.082 × 273) = 18.76 moles
Now we calculate mass of methane by the definition of moles as:
n = W/M, where
M = molar mass of methane = 16 g/mole
W = to find?
W = 18.76 × 16 = 300.2 grams or 300grams.
Hence, option (c) is correct i.e. 300 grams of methane occupy 420 L volume.
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FeCl3 + O2 = Fe2O3 +Cl2
Answer: FeCl3+O2-->Fe2O3+Cl2 is NOT balanced
Explanation:You first need to balance the equation. The balanced equation would be...
4FeCl3 + 3O2 ==> 2Fe2O3 + 6Cl2
moles FeCl3 present =4 moles
moles O2 present = 4 moles
Since the mole ration in the balanced equation is 4 FeCl3 : 3 O2, the limiting reactant will be FeCl3
moles Cl2 that can be produced = 4 moles FeCl3 x 6Cl2/4 moles FeCl3 = 6 moles Cl2
Answer:
what am i loooking at
Explanation:
what is the name of the molecular compound SF
Answer:
Sulfur tetra fluoride
Explanation:
How many molecules are in 1.2 L of CH4 at STP?
Answer: 4.48L of CH4 at STP is equal to 1.2×10^23 molecules
Explanation:
What do acids do in solution?
PLS HELP
A student takes some cold water in a beaker and dissolves two tablespoons of salt in it. When the student adds one more tablespoon of salt it gets settled at the bottom of the beaker. The student warms the water and observes that the salt disappears. What can be the reason for this observation?
Heat increases the solubility of water
Heat evaporates the excess salt in solution
After heating the solution become saturated
Two table spoon of salt makes the solution unsaturated
Answer:
A
Explanation:
A solution is prepared by mixing 769 mL of ethanol with 507 mL of water. The molarity of ethanol in the resulting solution is 10.8 M. The density of ethanol at this temperature is 0.7893 g/mL. Calculate the difference in volume between the total volume of water and ethanol that were mixed to prepare the solution and the actual volume of the solution.
Answer:
57 mL
Explanation:
To make things clear, when 769 mL of ethanol were mixed with 507 mL of water, the resulting volume was not (769+507) 1276 mL, but a lower value. This is because of the interactions between liquid molecules.
First we calculate how many grams of ethanol are there in 769 mL, using the given density:
mass = density * volume0.7893 g/mL * 769 mL = 606.97 g ethanolThen we convert 606.97 g of ethanol into moles, using its molar mass:
606.97 g ÷ 46.07 g/mol = 13.17 molNow we calculate the actual volume of the solution, using the definition of molarity:
Volume = Moles / Molarity13.17 mol / 10.8 M = 1.219 LFinally we convert 1.219 L to mL, and calculate the difference in volume:
1.219 L * 1000 = 1219 mL1276 mL - 1219 mL = 57 mLWhich equation shows the correct relationship between mechanical energy, kinetic energy, and potential energy?
Answer:
first answer
Explanation:
11.7 g of NaCl and 4.5 g of KBr were dissolved
in 47 g of water. What is the molality of NaCl
in the solution?
Answer:
4.26m
Explanation:
Molality , m, is an unit of concentration in chemistry defined as the ratio between moles of solute (In this case, NaCl) and kg of solvent (In this case, water).
To solve the question we need to find the moles of NaCl and the mass of water in kg:
Moles NaCl -Molar mass: 58.44g/mol-:
11.7g * (1mol / 58.44g) = 0.200 moles
Mass of Water in kg:
47g * (1kg / 1000g) = 0.047kg
Molality is:
0.200 moles / 0.047kg =
4.26m
How many grams of molecular chlorine will be required to completely react with 0.0223 moles of sodium iodide according to the following reaction?
2Nal + Cl2 ---> 2NaCl + I2
A. 1.57 104 grams
B. 3.16 grams
C. 0.0112 grams
D. 0.791 grams
The amount of chlorine will be 0.791 gram required to completely react with 0.0223 moles of sodium iodide .
The given chemical reaction is :
2Nal + [tex]Cl_{2}[/tex] → 2NaCl + [tex]I_{2}[/tex]
It is given that:
Amount of sodium iodide = 0.0223 mol.
Atomic mass of chlorine = 35.45 g.
The amount of chlorine can be calculated as:
0.0223mol. NaI × (1mol. Cl₂/2mol. NaI) × (35.45g/1mol. Cl2)
=0.791 grams
Therefore, the correct answer will be option (D).
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12. The molar mass of water is 18.0
g/mol. A mass of 90.0 grams of
water is equivalent to how many
moles?
HELP ASAP!!!
Answer:
5moles
Explanation:
number of moles=mass/molar mass
The molar mass of water is 18.0 g/mol. A mass of 90.0 grams of water is equivalent to 5 moles. Therefore, option B is correct.
What is molar mass ?The mass in grams of one mole of a substance is defined as its molar mass. Molar mass is measured in grams per mole, abbreviated as g/mol. The isotopic atomic mass of a single isotope of any given element is a value that compares the mass of that isotope to the mass of the isotope carbon-12.
A compound's molar mass can be calculated by adding the standard atomic masses (in g/mol) of its constituent atoms.
A compound's molar mass indicates the mass of one mole of that substance. In other words, it tells you how many grams of a compound there are per mole. As a result, the units for molar mass are grams/mole.
number of moles = mass / molar mas
= 90.0 grams / 18.0grams
= 5 moles
Thus, option B is correct.
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HELP!! When nitroglycerin (C3H5N3O9) explodes, it decomposes into the following gases: carbon dioxide, nitrogen, nitrogen monoxide, and water vapor. If 239g of nitroglycerin explodes, what volume of water vapor will be produced at 45.00 inHg and 2678C?
Answer:
Carbon monoxide, and water vapor was analyzed and found to contain 4.5 mol of carbon dioxide, 4.0 mol of carbon monoxide and 1.5 mole of water vapor. ... An ideal gas sample weighing 0.548 g at 100°C and 0.993 atm has a volume of 0.237 ... VSEPR predicts that an IF5 molecule
Explanation:
The volume of the nitroglycerin exploded can be calculated using the ideal gas equation. Here, the number of moles of water vapor formed is 10.5 moles. Then, the volume is 43807 L.
What is ideal gas equation ?Ideal gas equation connects the pressure, temperature and volume of a gas with its number of moles as written in the expression below:
PV = nRT.
where R = 0.082 L atm /K mol
One mole of nitroglycerin produces 10 moles of water. Then, 239 g or 1.05 moles produces 10.5 moles of water vapor.
Given,
P = 45 mmHg = 0.05 atm
T = 2678°C = 2951 K
n = 10.5
The volume of water vapor is calculated as follows:
V = nRT/P
= (10.5 mol × 0.082 L atm/K mol ×2951 K)/0.05 atm
= 43807 L.
Therefore, the volume of water vapor produced is 43807 L.
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(chem) which is more concentrated: 45.0 grams of HCOOH dissolved in 189 mL of water or 1.5 moles of CH↓2COOH dissolved in twice as much water?
Answer:
CH3COOH would be more concentrated
Explanation:
The higher the concentration value, the more concentrated it is.
The relationship between concentration, moles and volume is given by the equation;
Concentration = No of moles / Volume
5.0 grams of HCOOH dissolved in 189 mL of water
Number of moles = Mass / Molar mass = 5 / 46.03 = 0.1086 mol
Concentration = 0.1086 / 0.189 = 0.5746 mol/L
1.5 moles of CH3COOH dissolved in twice as much water
Volume = 2 * 189 = 378 ml = 0.378 L
Concentration = 1.5 / 0.378 = 3.9683 mol/L
Comparing both concentration values;
CH3COOH would be more concentrated
An atom of a mystery element contains 6 protons, 6 electrons, and 8 neutrons.
What is the mass number?
Answer:
14
Explanation:
Mass number is just the value of the protons and neutrons added, in this case its 14
The triple point of water occurs at a pressure of 4.59 mmHg.
What is the pressure in atm?
Answer:
The pressure in atm is 6.04 x 10^-3
Explanation:
Pressure of the gas is defined as the force exerted by the particles on the walls of the container. It is expressed in various terms like 'mmHg', 'atm', 'kiloPascals' etc..
All these units of pressure are inter convertible.
Pressure of the gas = 4.59 mm Hg
760 mm Hg = 1 atm
4.59 mm Hg= 1/760 x 4.59 = 6.04 x 10^-3atm
The pressure in atm is 6.04 x 10^-3
salat tarawih itu boleh dilakukan di masjis
I NEED HELP ON THIS SCIENCE QUESTION
What is the mass of 5.80 × 10²³ atoms of silver (Ag)?
A. 0.00893 g
B. 0.00963 g
C. 104 g
D. 112 g
Answer:
104 g
Explanation:
i just solved it
The actual brightness of a supergiant is more than the actual brightness of our sun. Explain why this
A supergiant is the largest star in space, so it is the brightest,
A supergiant is made up of different gases than our sun, so it is brighter,
A supergiant appears brighter than our sun, but our sun is actually brighter,
A supergiant is more powerful than our sun, so it gives off more light energy,
AMSWER:
B. I'm sorry if this is wrong
Explanation:
what is the number of electrons in the element Nickel
If 2.50 grams of ethane is allowed to react with 5.00 grams of oxygen how many grams of water would be expected?
Answer:
The mass of water produced is 4.29 g.
Explanation:
Given;
reacting mass of ethane, C₂H₆ = 2.5 g
reacting mass of oxygen, O₂ = 5.0 g
The balanced combustion reaction is given as follows;
2C₂H₆ + 7O₂ ----------------> 4CO₂ + 6H₂O
Based on the balanced equation above;
requires
7.0 moles of oxygen -----------------------> 2.0 moles of ethane
requires
5.0 g of oxygen --------------------------> x gram of ethane
x = (2 x 5) / 7
x = 1.43 g
Ethane is in excess of 1.07g (2.5 g - 1.43g)
Now, determine the mass of water produced by 1.43 g of ethane;
requires
2.0 moles of ethane -----------------------> 6.0 moles of water
requires
1.43 g of ethane --------------------------> y gram of water
y = (6 x 1.43) / 2
y = 4.29 g
Therefore, the mass of water produced is 4.29 g.
If a reaction occurs between a compound that has a lemon smell and one that has a rose smell
what will the product smell like?
Leron Smell
Rose Smell
Smell?
+
A
The product will smell of lemon.
B
The product will smell of roses.
с
The product will have a lemon-rose smell.
OD
It is impossible to predict the smell of the product.
Answer:
f
Explanation:
fywuiw but I you to the t
Answer:
c
Explanation:
Every afternoon, Bill and Anita go down to the beach to fly their kite. They noticed that the wind always blows towards shore. Why is this? PLEASE HELP QUICKLY
The energy of ocean waves pushes air towards shore
Earth's rotation causes air to blow toward land
Ocean air is less dense, so it moves in to replace air over the land
Air over the beach heats up, rises, and is replaced by cool, denser ocean air
Answer:
the answer is D
Explanation:
Air over the beach heats up, rises, and is replaced by cool, denser ocean air
The ocean heats up much slower and becomes relatively cooler than the beach making it a high pressure zone. The air moves from the water to the land each morning forming a sea breeze. These pressure zones might equal out later in the day and the winds may diminish. ... A sea breeze blows from the ocean towards the beach.
what is an acid base indicator
Answer:
Acid-base indicators are generally weak proteolytic that change color in solution according to the pH. The acid-base equilibrium of a weak acid type of indicator (HI) in water can be represented as. [I] The acid, HI, and the conjugate base, I−, have different colors. The equilibrium expression for this process is.
please help with stoichiometry!
Answer:
I don't know sorry
Explanation:
ask tutor
The materials or compounds that are changed into a new compounds in a chemical reaction are know as
Answer:
Reactants
Explanation:
They become known as reactants