Answer:
on which cloth. since the sub is chemistry. which chemical or mixture or compound
Calculate the simplest formula of the compounds formed in the
following reactions:
Please just check if I’m correct or wrong
a) 2.3 g of sodium reacting with 8.0 g of bromine
Na=23
Br=80
My answer:
NaBr
I'm sorry I'm not sure of my answer so I am not gonna give you the answe
A container holds 2.0 liters of a gas at 5.0 atmospheres of pressure. If both the temperature and the amount of gas are kept constant while the volume is doubled, what is the new pressure of the gas A 0.5 L B 1.0L C 4.0 L D 8.OL
The new (final) pressure of the sample of gas is equal to 2.5 Liters.
Given the following data:
Initial volume = 2.0 LitersFinal volume = 4.0 LitersInitial pressure = 5.0 atm.Note: The initial volume was doubled.
To determine the new (final) pressure of the sample of gas, we would apply Boyle's law:
Mathematically, Boyle's law is given by the formula;
[tex]PV = k\\\\P_1V_1 = P_2V_2[/tex]
Where;
[tex]P_1[/tex] is the initial pressure.[tex]P_2[/tex] is the new (final) pressure.[tex]V_1[/tex] is the initial volume.[tex]V_2[/tex] is the final volume.Making [tex]P_2[/tex] the subject of formula, we have:
[tex]P_2 =\frac{P_1V_1}{V_2}[/tex]
Substituting the given parameters into the formula, we have;
[tex]P_2 = \frac{5.0 \times 2.0}{4.0} \\\\P_2 = \frac{10}{4.0}[/tex]
New volume = 2.5 Liters
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What does it mean when an element turns into an ion?.
Answer:
When a neutral atom gains one or more electrons, the number of electrons increases while the number of protons in the nucleus remains the same. The result is that the atom becomes an anion—an ion with a net negative charge.
Explanation:
What was the main reason why Alfred Wegener's theory about the movement of the continents was dismissed in 1912?
His theory explained the Earth was expanding as the plates moved
He didn't know about plate tectonics to explain how the plates moved
His map of the ocean floor did not support his theory
His theory was the first to observe the continents fit together
Answer:
His map of the ocean floor did not support his theory
Explanation:
Alfred Wegner was a great scientistHe observed the plate tectonics of earth and described it in a theory.It was dismissed after viewing his ocean floorAnswer:
He didn't know about plate tectonics to explain how the plates moved
Explanation:
Wegener believed the continents had pushed through the ocean floor. However, he did not have a satisfactory explanation for how this happened. There was no known source of energy large enough to move continents through the sea floor. Also, although scientists had data about the interior of Earth from earthquakes, there were no clues in Earth's crust to show that the continents had broken through the sea floor. Given this lack of evidence to explain the mechanism of continental drift, scientists did not accept this idea.
What are the diffrent types of chemical reactions?
A chemical reaction is a process that can lead to a change of state, the outcome of a chemical reaction can ultimately lead to the formation of a new substance.
Types of Chemical ReactionsSynthesis reactionsDecomposition reactionsSingle-replacement reactionsDouble-replacement reactionsCombustion reactions.Learn more about chemical reaction here:
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Which describes an element?
A.They cannot be broken down any further.
B.They can combine with other elements to form atoms.
C.They were all discovered at the same time.
D.They were created in the Earth’s core.
Answer:
I think it's D one. Because all others are wrong
Answer: They can combine with other elements to form atoms.
Explanation:
How many particles or molecules of hydrogen are there in one mole of H2O?
6.022 × 10^23 ×2 = 12.044 × 10^ 23 atoms
Answer:
In one mole of water, there will exist approximately 6.02⋅1023 water molecules. So, there will be a total of 6.02⋅1023⋅2≈1.2⋅1024 hydrogen atoms.
Which of the following shows a valid combustion reaction?
2Al + 2O2 → 2AlO + O2
C2H4 + 3O2 → 2CO2 + 2H2O
2CH4 + O2 → 2CO + 4H2
Ca + O2 → CaOH
Answer: C2H4 + 3O2 → 2CO2 + 2H2O
Explanation:
2Al + 2O2 → 2AlO + O2 Not Balanced Properly: 2Al + O2 = 2AlO
C2H4 + 3O2 → 2CO2 + 2H2O Looks Good
2CH4 + O2 → 2CO + 4H2 Not Correct: CO should be CO2
Ca + O2 → CaOH Not Balanced and No source for the H
Answer:
2H4+3O2 →2CO2+2H2
Explanation:
Of the four gases co2, h2o, n2, and o2, which are greenhouse gases?.
Answer:
h20, 02, and c02
Explanation:
What is the correct formula for tetraphosphorous octaoxide
P4O10
P4O8
Ph4O8
P5O8
P_4O_8
How?
Let's learn how to create name of compound from its name.
Look below for root words
2-di 3-tri4-tetra5-pent6-hex7-hept8-oct9-non10-decHence formula of the compound is P4O8
in hydrogen iodide __________________ are the most important intermolecular forces.
Answer:
dipole-dipole forces
Explanation:
The important intermolecular force in hydrogen iodide HI is dipole- dipole forces. This force is arising due to the partial charge separation and permanent dipole moment.
What is dipole-dipole force?There are various intermolecular forces which binds two atoms chemically to form a compound. Ionic bonding, covalent bonding, dipole -dipole force, hydrogen bonding, Van der Waals force etc are some of them.
Dipoles are opposite charges separated by a small distance. Dipole -dipole force is generated between the atoms when they have partial charge separation and this creates a permanent dipole moment.
Hydrogen is an electropositive atom and iodine is slightly electronegative. This difference in electronegativities leads to the bonded electrons more attracted towards iodine result in partial charge separation and dipole-dipole force.
To find more on dipole-dipole forces, refer here:
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#SPJ2
Two chemical reactions are shown:
A. Ca(OH)2 - CaO + H2O
B. 4K + O2 + 2K20
Which statement is true?
A. Both are synthesis reactions
B. Both are decomposition reactions
C. A is a synthesis reaction, and B is a decomposition reaction
D. A is a decomposition reaction, and B is a synthesis reaction
Answer: A is a decomposition reaction, and B is a synthesis reaction
Explanation: the first equation shows the reactant breaking up into 2 parts aka decomposition and equation 2 shows the reaction being combined into one part, aka synthesis. hope that helps!
Answer:
Answer d
Explanation:
which pair of elements would most likely form a covalent bond
Answer:
Nonmetals and nonmetals tend to form covalent bonds.
or
P and S
Explanation:
A sample of gaseous arsine (AsH3) in a 460 mL flask at 332 Torr and 223 K, is heated to 437 K, at which temperature arsine decom- poses to solid arsenic and hydrogen gas. The flask is then cooled to 273 K, at which tem- perature the pressure in the flask is 488 Torr. What percentage of arsine molecules have de- composed?
Answer in units of %.
Answer:
28/95 = 29.,5 % of Arsine decomposed
Explanation:A sample of gaseous arsine (AsH3) in a 460 mL flask at 332 Torr and 223 K, is heated to 437 K, at which temperature arsine decom- poses to solid arsenic and hydrogen gas. The flask is then cooled to 273 K, at which tem- perature the pressure in the flask is 488 Torr. What percentage of arsine molecules have de- composed?
Answer in units of %.
initial pressure 332 Torr initial volume 0.46 L initial temperature 223K
final pressure 488 Torr final volume 0.46 L final 273 K
Torr is 1/760 atm 332 torr = 0.437 atm 488 Torr =0.642 atm
PV = nRT so n=RT/PV
INITIAL n= 0.082 X 223/(0.437)(0.46) = 91 moles
final n= 0.082 X 273 / (.437)(488) = 105 moles
2AsH3----------> 2As + 3H2
x moles of Arsine decomposed to make 1.5 moles of H2
the final number of moles was
(91 -X)+ 1.5 X = 105 moles
91 + 0.5 X = 105
0.5 X = 14
X =28
CHECK
if 28 moles of Arsine , then the container would have
91 --28 + 1.5(28) = 91 +14 =105 check
so 28/95 = 29.,5 % of Arsine decomposed
Your answer
(quit)
polyalchemVirtuoso
Answer:
Explanation:
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Metallic bonding is...
a
a type of covalent bond.
b
a type of ionic bond.
c
an attraction between positive and negative ions.
d
an attraction between positive ions and electrons.
Answer:
d an attraction between positive ions and electrons
Where do you think the atoms for plant growth come from?
Answer:
the mass of a tree is primary carbon
Explanation:
the the carbon comes from carbon dioxide during photosynthesis
Answer:
Plants get all the carbon, hydrogen, and oxygen they need from carbon dioxide and water, which they use to build carbohydrates during photosynthesis. To build other kinds of molecules they also need elements like nitrogen, phosphorous, and sulfur. Plants get these as well as other elements from the soil.
Explanation:
Which option is a key point of cell theory? Cells can repair neighboring cells, but not themselves.Cells can repair neighboring cells, but not themselves. , , Cells are the basic structural unit of all living organisms.Cells are the basic structural unit of all living organisms. , , All cells that make up an organism are similar to each other.All cells that make up an organism are similar to each other. , , Some cells can burn food molecules to release energy, but some cannot.
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Cells are the basic structural unit of all living organisms.
Explanation:
Hope this helps, but i'm unsure if it would be multiple choice or not.
What will be the product or products if zinc (Zn) reacts with hydrochloric acid (HCl)?.
The products of the reaction are Zinc chloride (ZnCl₂) and Hydrogen gas (H₂)
From the question,
We are to determine the product or products when zinc (Zn) reacts with hydrochloric acid (HCl)
To determine the product or products, we will write the chemical equation for the reaction.
The balanced chemical equation for the reaction is
Zn + 2HCl → ZnCl₂ + H₂
Hence, the products of the reaction are Zinc chloride (ZnCl₂) and Hydrogen gas (H₂)
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What is the missing letter in H,J,K,L,M,N,O,P.? And what is the opposite of HATE.? And what is the opposite of ME.?
Think about it -,-
Answer:
The letter I
Explanation:
H, I, J, K, L, M, N, O, P
Answer:
Ahhhhhhhhhhhhhhh. Me too. I really needed to hear that today.
Explanation:
thanks for that.
Why can’t you split an element in half?
Answer:
It depends on the atom, or more specifically, on the size of its nucleus. There is a competition between the electrical repulsion of the protons (that drives the nucleus apart) and the attraction of the protons and neutrons (due to chromodynamics). For nuclei above a certain size, the repulsion tends to win
Explanation:
hope this helps
What is the IUPAC name for NH3? ammonia mononitrogen hydride mononitrogen trihydride nitrogen trihydride.
The IUPAC name for NH3 is Ammonia
The IUPAC name is also known as (International Union of Pure and Applied Chemistry) and it is a standardized system by chemical scientists for naming chemical compounds.
The IUPAC name for NH3 is Ammonia. Ammonia is a colorless gas with a stifling odor that is an exceedingly unpleasant pungent smell. It dissociates quickly in water to generate ammonium hydroxide, which can irritate and burn the skin.
It serves an agricultural purpose such as fertilizer.It is also used for the production of plastics, textiles, insecticides, etc.Learn more about the IUPAC naming system here:
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Define valence electrons.
Answer:
Electrons on the outermost shell of an atom. They are responsible for the chemical properties of an atom.
An electrochemical cell operates because the electrodes in the two half-cells differ in their electrical potential. A metal electrode composed of ______ reducing agent will have a greater electrical potential to push electrons toward the electrode composed of a ______ reducing agent.
A metal electrode composed of strong reducing agent will have a greater
electrical potential to push electrons toward the electrode composed of a
weak reducing agent.
Strong reducing agents are compounds which donates or loses electrons
with a corresponding increase in the oxidation state. Weak reducing agents
can also be referred to as oxidizing agents and they accept the electrons
from the strong reducing agents which results in a reduction in the oxidation
state.
The strong reducing agent has a greater electric potential which aids the
electrons being pushed towards the electrodes with a weak reducing agent.
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How many moles are present in 1.39 grams of carbon?
Answer:
0.116 moles
Explanation:
To go from grams to moles, you take the given mass (1.39g) and divide it by the molar mass (which is about 12 grams for Carbon). This gives you the moles. I have attached my work below.
Hope this helps! :^)
The diagram shows fertilization, the union of sperm cell and egg cell.
The traits of the offspring of the fertilized egg are coded onto
A
lipids in the offspring's cell membranes.
B
enzymes in the offspring's ribosomes.
C
genes in the offspring's chromosomes.
D
water in the offspring's mitochondrion.
A compound contains 70% by mass of iron and 30% by mass of oxygen.
What is its empirical formula?
(A: 0, 16; Fe, 56]
Answer:
FeO₂
Explanation:
hAVE A nice day
Explanation:
If we assume it's FexOy
Fe : O
70 : 30. (mass ratio)
x:y = 70/56 : 30/16. (mole ratio)
1.25 : 1.875
= 1.25/1.25: 1.875/1.25
= 1 : 1.5
=2 : 3
Therefore It's Fe2O3
Cr(NO3)3(aq) +CuCl2(aq)
[tex]2\text{Cr(NO}_3\text{)}_3} + 3\text{CuCl}_2 \longrightarrow 2\text{CrCl}_3 + 3\text{Cu(NO}_3\text{)}_2[/tex]
Hg2(NO3)2 + Na2CO3 = NaNO3 + HgCO3 balance this
Answer:
Hg(NO3)2 + Na2CO3 --> 2NaNO3 + HgCO3
What is the amount, in mol, of 15g of carbonate ions, C03^2-
24 electrons.............
how many outer boundaries does a animal cell have
Answer:
The plasma membrane.
Explanation:
membrane, in biology, the thin layer that forms the outer boundary of a living cell or of an internal cell compartment. The outer boundary is the plasma membrane, and the compartments enclosed by internal membranes are called organelles.