Answer:
2.047 × 10^22 atoms.
Explanation:
To calculate the number of atoms (nA) in AlCl3, we first need to find the number of moles in the compound, AlCl3.
Molar mass of AlCl3 = 27 + 35.5(3)
= 27 + 106.5
= 133.5g/mol
Using mole = mass/molar mass
mole = 4.5/133.5
mole = 0.034moles
number of atoms in a substance (nA) = number of moles (n) × Avagadros number or constant (6.02 × 10^23 atoms)
nA of AlCl3 = 0.034 × 6.02 × 10^23
nA = 0.2047 × 10^23
nA = 2.047 × 10^22 atoms.
Name the type of chemical reaction.
NaBr + H3PO4 → Na3PO4 + HBr
Answer:
double displacement (metathesis) hope that helps!(^_^メ)
Explanation:
meh.
What is the mole ratio of water (H20) to phosphoric acid (H3PO4)?
P.010 + H2O 4H3PO4
Before
After
Р
4
(4) - 4
4(4) - 16
O 10+1
H
2
3(4) - 12
1:1
46
6:4
2:2
Answer:
the answer to this problem is before
Explanation:
A chemical process used to produce ethanol as a fuel additive was expected to produce 5,000 kilograms of ethanol based on the amounts of starting materials used, but only 4,760 kilograms were produced. What was the percent yield for ethanol in this process?
A)1.09
B)4.80
C)95.2
D)105
Answer:
C)95.2
Explanation:
Given parameters:
Expected yield = 5000kg
Experimental yield = 4760kg
Unknown:
Percentage yield = ?
Solution:
The percentage yield of the substance is determined by find the ratio of the true experimental yield to the expect yield and multiply by 100;
Percentage yield = [tex]\frac{4760}{5000}[/tex] x 100 = 95.2%
How many moles of atoms in 22.5 g Zn
Answer: 1 mol of Zn is 65.38g
Explanation: To find the number of moles of Zn, we divide the given amount of Zn by the molar mass of Zn. Hence, 1.34 g of Zn contains 0.020 moles of Zinc.
0.34 mole of atoms in 22.5 g Zn.
What are moles?A mole is defined as 6.02214076 × [tex]10^{23}[/tex] of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
To find the number of moles of Zn, we divide the given amount of Zn by the molar mass of Zn.
[tex]Moles = \frac{mass}{molar \;mass}[/tex]
[tex]Moles = \frac{22.5}{65.38 u}[/tex]
Moles = 0.34 mole
Hence, 0.34 mole of atoms in 22.5 g Zn.
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what volume of 0.20 M NaCl contains 10.0 g
is mass conserved in 2Na+2H2O=2NaOH+H2
Answer:
yes mass conservation is in 2Na+2H2O=2NaOH+H2
Explanation:
it tells how many atoms or molecules of a reactant or a product take part in the reaction
True or False: Potential and kinetic energy are fixed and do not convert between the two types. *
10 points
Answer:
false
Explanation:
According to the law of conservation of energy, energy can neither be created nor destroyed but can be converted from one form to another. Hence, the given statement is true.
What is law of conservation of energy?According to law of conservation of energy, it is evident that energy is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of energy is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Julius Robert Mayer in the year 1842.
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An elephant and a parakeet standing on ledge will have a different amount of potential energy because of their . this is for science actually
Answer:
Mass
Explanation:
Please answer 14 will give brainliest
Answer:
I think it's alkali metals
Answer:
[tex]its \: fluorine \: and \: it \: belongs \: to \ : \\ 17th \: family \: noble \: gases[/tex]
A student rings a brass bell with a frequency of 300 Hz. The sound wave
travels through brass, air, and glass. What is the wavelength of the wave in
brass?
Medium
Wave speed
(m/s)
Brass
4,700
Air
346
Glass
5,640
A. 0.64 m
B. 1.6 m
C. 0.064 m
D. 16 m
The wavelength of the wave in brass medium, given that the wave has a frequency of 300 Hz is 16 m (Option D)
How do I determine the wavelength in brass?The wavelength of a wave is defined according to the following formula:
Velocity (v) = wavelength (λ) × frequency (f)
Divide both sides by frequency
Wavelength (λ = Velocity (v) / frequency (f)
With the above formula, we can obtain the wavelength of the wave in the brass medium. Details below:
Frequency (f) = 300 HzWave speed in brass (v) of = 4700 m/sWavelength in brass (λ) = ?Wavelength (λ = Velocity (v) / frequency (f)
Wavelength in brass = 4700 m/s / 300 Hz
Wavelength in brass= 16 m
Thus, we can conclude that the wavelength is 16 m (Option D)
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According to the Laws of Conservation Matter Atoms are not
they are not created or destroyed
1.Let's say you could see inside of the nucleus of a Silver atom and inside the nucleus of a Cobalt atom. How would they look different?
2.If a substance has no (or almost no) likelihood of undergoing a chemical reaction with another element it is said to be:
a.Ionized
b.Malleable
c.Reactive
d.Inert
e.An Isotope
3. Evaluate this sentence and explain why it is incorrect:
“Neon came into contact with Iron and the reaction was very explosive.”
4. Mr. Carney does and experiment. He weighs himself. He weighs 210 lbs. He then runs 15 miles. Then weighs himself. He now weighs 200 lbs.
Explain the conservation of mass using this experiment as your example.
NEED ANSWERS NOW DUE TODAY
A chemical formula is shown the subscription in a chemical formula represent the
Answer:
A, option is the correct answer of this question
Two layers of earth have convection currents
Answer: Mantle and core are the two layers of the earth that have convection currents.
Explanation:
The mantle and outer core are the two layers that are associated with the convection currents. In the mantle the convection currents occur due to the heat emerging out of the core also mantle region releases heat. If the transfer of heat or convection currents stop then the mantle will not flow and the core will not produce magnetic field at all. This will lead to coldness in earth and earth will lose the protection from harmful radiations.
1. How many moles of nitrogen gas are in 1.54x10^26 molecules? How many atoms?
2. How many molecules of water are in 3.45 moles of water?
3. How many atoms of C are in 2.00 moles of Cv6Hv12Ov6? (v means the number is below)
Answer:
Try everything
1. How many moles of nitrogen gas are in 1.54x10^26 molecules? How many atoms?
2. How many molecules of water are in 3.45 moles of water?
3. How many atoms of C are in 2.00 moles of Cv6Hv12Ov6? (v means the number is below)
Explanation:
You are cooking dinner using a metal pan. When you pick up the pan,the handle burns your hand. Which form of thermal energry transfer causes you to burn your hand?
a conduction
b convection
c radiation
Answer:
Conduction
Explanation:
Answer: The answer would be A conduction
PLEASE HELPP! EXPLAIN UR ANSWER AND ILL GIVE BRAINLIEST
Answer:
false it removes carbon dioxide ......The heart pumps blood to all parts of the body. Blood provides oxygen and nutrients to the body and removes carbon dioxide and wastes. As blood travels through the body, oxygen is used up,
Explanation:
Oxygenated blood travels from the lungs through the pulmonary veins and into the left side of the heart, which pumps the blood to the rest of the body (see Function of the Heart). ... Then the blood is pumped through the pulmonary artery to the lungs, where it picks up oxygen and releases carbon dioxide.
Answer:
true because your heart contains blood that flows through you body system
WILL GIVE BRAINLIEST!!
A magnetic globe is being held down on a base. When released, the globe rises above the base and eventually comes to rest floating above the base.
In which position shown does the globe have the greatest magnetic potential energy?
Answer:
It is position 3
Explanation:
Because the further the magnets are the higher the potential energy, and in position 3 the globe is the furthest from the base meaning that in base 3 the magnetic potential energy is the highest or greatest there.
Please answer this question please brianlest
Answer:
ok, maybe draw like a few plants and dear, you know and draw them out of cells, like the shape. so like a bunch of cells together making the shape of a deer or plant and stuff. i hope this helps
Explanation:
which of the following is the best description of an elment
A. A substance that cannot be broken down into simpler substance
B. A small particle made with a specific chemical composition
C. A naturally occurring mineral made of more than one substances
D. A collection of atoms that have different abilities when joined together
Answer:
d
Explanation:
atoms join together to produce elements
Answer:
An element is a substance whose atoms all have the same number of protons: another way of saying this is that all of a particular element's atoms have the same atomic number. Elements are chemically the simplest substances and hence cannot be broken down using chemical reactions.
Explanation:
What valence electron number do they all have in common
The answers plzzzzzzz
Answer:
ok, whats the question
Explanation:
which is the first stage of mitosis?
A.anaphase
B.prophase
C.metaphase
D.telophase
Answer:
c
Explanation:
Jacob walked into a shop to buy cups for his house. He saw the cups shown below. Why does the cup on the right appear yellow? A. The cup absorbs yellow light but reflects all other colors of light. B. The cup reflects yellow light but refracts all other colors of light. C. The cup refracts yellow light but absorbs all other colors of light. D. The cup reflects yellow light but absorbs all other colors of light.
Answer:
D. The cup reflects yellow light but absorbs all other colors of light.
Explanation:
The cup in the shop appears yellow because the cup reflects yellow light but absorbs all colors of light.
Due to the materials the cup is made of, it is able to specifically reflect yellow and absorb other radiation types.
The color we see are products of the part of visible radiations they reflect.
The cup in this instance reflects yellow and absorbs other color.
Something that is made out of natural resources for human use is called
Answer:
Man-made resources
Explanation:
Humanized resources are items or substances that have value to human lives that do not occur in the natural world. Examples of man-made resources include plastic, paper, soda, sheet metal, rubber and brass. These contrast with natural resources, such as water, crops, sunlight, crude oil, wood and gold.
Which is a non-living feature of the environment? A. Bacteria B.sun C. Fungi D. Cow
Answer:
B. Sun
Explanation:
While what exactly qualifies as "living" can be contested when talking about viruses, bacteria, etc. It is commonly accepted that Bacteria, Fungi and Animals (Cows) are all organisms. The Sun, however is no organism.
Which of the following are held together by nonpolar covalent bonds? PLEASE HELP
Answer:
The atoms of chlorine are held together by non-polar covalent bonds. Covalent bonds are formed between two or more atoms having zero or very small electronegativity difference. For homonuclear molecules where the two bonding atom are of the same kind, the electronegativity difference is zero.
C. Atoms of chlorine (CI)
A covalent bond is created when the electrons from the two involved atoms are shared equally.The pair of electrons involved in this kind of bonding is referred to as the shared pair or bonding pair. Here the atoms of chlorine have non-polar covalent bonds. The correct option is C.
What are non-polar covalent bonds?A non-polar covalent connection is created when atoms with an equal amount of electrons share one another. The electronegativity of the two atoms is equivalent. When two atoms with similar electron affinities join together, like in the case of diatomic elements, it happens.
Non-polar covalent compounds are those in which there is no variation in electronegativity. In these compounds, the electronegativity does not change, preventing the motion of the bond pair's electrons in the direction of the linked atoms.
As a result, a molecule is non-polar and non-conducting since there is no bond or dipole moment between its atoms and no buildup of charges on the atoms.
Thus the correct option is C.
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Help Me ASAP! Looking at the picture above which images would be best classified as molecules?
Answer:
B
Explanation:
Answer:
C) B AND C
Explanation:
points
Does the size of the solute (sugar) affect the rate of dissolving?
Answer:
Yes
Explanation:
The rate at which a solute dissolves depends upon the size of the solute particles. Dissolving is a surface phenomenon since it depends on solvent molecules colliding with the outer surface of the solute.
Brainliest?
What is a fossil?
The remains of an animal or plant preserved within a layer of rock?
A orange body of compacted ice formed over thousands of years?
The energy radiated from sun?
A change in the structure of earths surface?
Answer:
the remains of an animal or plant preserved within a layer of rock otherwise A.
A fossil is the remains of an animal or plant preserved within a layer of rock. The correct option is A.
What are fossils?Fossils are the preserved form of animals or plants that are preserved on rocks or deep in the earth's crust and did not get damaged. They are discovered in the digs that are done by paleontologists.
The bones and sometimes dry skins and hairs, and teeth are also found that are preserved. These fossils help in studying animals and plants that were present in former times.
They do not get destroyed because they are preserved in rocks and stones. We got to know about dinosaurs by their fossils. There are different types of fossils are found.
Thus, the correct option is A. The remains of an animal or plant are preserved within a layer of rock.
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