Answer:
D
Explanation:
most logical explanation for this question.
The number of moles of an element determined from a known mass is the mass of 1 mole of the element is used as a conversion factor to convert grams to moles.
What is moles?A mole is the quantity of a substance containing 6.023 x [tex]10^{23}[/tex] particles of that substance. The mole is just the SI unit for such a substance's quantity.
What is element?Chemical reactions could not break down a component into simpler chemicals, hence it can be referred to as an element.
The number of moles of an element determined from a known mass is the mass of 1 mole of the element is used as a conversion factor to convert grams to moles.
Therefore, the correct answer will be option (D).
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Find the number of moles of argon in 534 g
of Argon
Answer:
13.4 mol Ar
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
534 g Ar
Step 2: Identify Conversions
Molar Mass of Ar - 39.95 g/mol
Step 3: Convert
[tex]534 \ g \ Ar(\frac{1 \ mol \ Ar}{39.95 \ g \ Ar} )[/tex] = 13.3667 mol Ar
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
13.3667 mol Ar ≈ 13.4 mol Ar
Answer:
The number of moles in 452 grams of Argon is 13.31 moles.
Explanation:
The following model was used to show a molecule of methane, or CH4. Describe the number and type of each atom of the molecule. Fill blank boxes with the right answer. The blue sphere represents atom(s) of the element The red sphere represents atom(s) of the element
Answer:
Also attached model picture
Explanation:
This question is incomplete because it does not include the image of the model. But it can be answered based on my previous knowledge.
A CH4 atom has 4 hydrogen atoms and 1 carbon atom.
Methane is a chemical compound classified as a hydrocarbon whose chemical formula is CH4. This compound is found in nature in the form of a gas and has no odor or color. It originates as a result of the decomposition of plants.
According to its chemical formula CH4, it can be inferred that methane is made up of one carbon atom and four hydrogen atoms.
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What is a variable?
1.The factors that are the same in an experiment.
2.The factor that is different in an experiment.
Answer:
2. The factor that is different in an experiment.
Explanation:
a variable is able to change because it is an element, feature, or factor that is liable to vary or change
which is the fastest chemical reaction
Answer: dust or decay
Explanation:
Using the VSEPR theory , what would the representation mean A central atom with 2 connected atoms atom with I lone pair of Jone pair of electrons electrons with 2 connected atoms to the central atom central atom with 2 pairs of lone pair none of these electrons and commected atom to the central
Answer:
The molecule has a bent geometry
Explanation:
Let us look again at the principles of VSEPR theory. The shape of a molecule depends on the number of electron pairs that surround the valence shell of the central atom in the molecule.
Lone pairs distort the molecular geometry away from what is expected on the basis of VSEPR theory.
The molecule described in the question has the form AEX2. Two substituents and one lone pair form three electron domains around the central atom. The expected geometry is trigonal planar but the observed molecular geometry is bent because of the lone pairs present.
If an acid has the formula HCO2H, what would be the charge on the CO2H’ion?
negative 2
negative 3
negative one
positive two
positive one
Answer:
b
Explanation:
11) Predict the products of this reaction.
CuSO4(aq) + 2KOH(aq) →
A) Cu(OH)2(aq) + K2SO4(s)
B) Cu(OH)2(s) + K2SO4(aq)
C) CuOH(s) + K2SO4(aq)
D) CuOH2(s) + K2SO4(aq)
Answer:
6FCRXCTV
Explanation:
ED5RF6GT7HY8JU9KI0LO-;PJH7YNG6GDAnswer:
b
Explanation:
a p e x
difference between fluids and nonfluids
Answer:
All liquids are fluids but not all fluids are liquids. Fluids basically describe anything that can flow as a result of a difference in pressure between two points. Liquids on the other hand are a subset of fluids. Liquids are the incompressible fluids. These are the fluids who's density does not change sharply with pressure.
Gases are also fluids, they form the compressible fluids. They do flow as a result of difference in pressure between two points but at the same time they can be compressed or expanded. Their density fluctuates with pressure.
Hence fluids consist of 2 mutually exclusive groups of compressible and incompressible fluids. Liquids are the incompressible fluids and hence form a subset of the more general term fluid.
The energy required to break the bonds for an exothermic reaction to occur is called the _ energy.
Answer:
This stored chemical energy, or heat content, of the system is known as its enthalpy.
Explanation:
Due to the absorption of energy when chemical bonds are broken, and the release of energy when chemical bonds are formed, chemical reactions almost always involve a change in energy between products and reactants.
The sun heats air masses in Earth's atmosphere causing
Answer:
convection
Explanation:
The heating of the Earth's surface and atmosphere by the sun drives convection within the atmosphere and ocean. This convection produces winds and ocean currents. The greater the pressure differences between a low-pressure area and a high-pressure area, the stronger the winds.
A material that conducts electricity only at high temperatures.
A.Semiconductor
B.Compound
C.Luster
D.Brittle
Answer:
Semiconductor
Explanation:
Semiconductors conduct electricity as the temperatures increase.
Hope this helped.
help fast please it's timed
Answer: B its most likely
I think it would be d if I am wrong im am sorry
Why are metals good conductors of heat?
O A. The free-moving electrons transmit heat quickly.
B. The malleable atoms slide past each other, transmitting heat.
O c. The formation of alloys allows a path for heat to travel.
O D. The ductility allows heat to move along an edge quickly.
Answer: A. The free-moving electrons transmit heat quickly.
Explanation:
Answer:
the free-moving electrons transmit heat quickly.
Explanation:
i just took the test
Green plants convert light energy from the sun into what during photosynthesis
Answer: It turns the energy from the sun into a food for the plant.
I hope this helps, and Stay Safe! :)
it tuns the light into food
Examination reveals that 180.2 g/mol of glucose contains 72.1 grams of carbon, 96 g/mol of oxygen and the remainder is hydrogen. How many g of hydrogen are there in 55.5 g of glucose?
Mass of Hydrogen = 3.7 g
Further explanationThe empirical formula is the smallest comparison of atoms of compound forming elements.
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
(empirical formula) n = molecular formula
180.2 g/mol of glucose-C₆H₁₂O₆ contains 72.1 grams of carbon, 96 g/mol of oxygen and the remainder is hydrogen
Remainder Hydrogen :
[tex]\tt 180-(72.1+96)=11.9~g/mol[/tex]
% mass of Hidrogen in Gllucose :
[tex]\tt \dfrac{11.9}{180}\times 100\%=6.61\%[/tex]
So mass of Hydrogen in 55.5 g Glucose :
[tex]\tt 6.61\%\times 55.5~g=3.7~g[/tex]
Which of the following compounds results from the formation of an ionic bond?
A) H2O
B)NO2
C)NaCl
D)CO2
Answer:
my answer is a I think but i an not sure
The compound that results the formation of an ionic bond is
C) NaCl
What is Ionic bond?It is a type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom.
Out of the given options only NaCl i.e. sodium chloride is an ionic compound that is formed by a formation of two ions which are sodium and chloride ions.
Thus, option C is correct.
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ANSWER AS SOON AS POSSIBLE PLEASE!!!! Which type of water represents the largest percentage of earths water?
Answer:
im pretty sure its groundwater just read this and see the answer
Explanation:
The ocean holds about 97 percent of the Earth's water; the remaining three percent is found in glaciers and ice, below the ground, in rivers and lakes. Of the world's total water supply of about 332 million cubic miles of water, about 97 percent is found in the ocean.
Which of the following factors would reduce the yield of a reaction?
A. The reaction occurs very quickly.
B. The reactants form additional unexpected products.
C. The reaction requires a large quantity of heat.
D. The reaction produces a large quantity of heat.
Answer:
B. The reactants form additional unexpected products.
Explanation:
Question 25 pts
(03.01 MC)
The table shows the total number of electrons in Atom A and Atom B.
Atom Number of Electrons
A 10
B 12
Which statement is correct? (5 points)
Group of answer choices
A will give up two electrons to form bonds.
B will give up two electrons to form bonds.
Both A and B will be chemically unreactive.
Both A and B will gain electrons to become stable.
Answer:
B will give up two electrons to form bonds.
Explanation:
B has 12 electrons, it means that the electronic configuration of B is; 1s2 2s2 2p6 3s2. The implication of this is that B must be an element of group 2 since it has an outermost electron configuration of ns2.
The elements of group 2 form ionic bonds by loss of two electrons. This implies that B will form bonds by loss of two electrons.
The statement i.e. correct is B will give up two electrons to form bonds.
The following information should be considered:
B has 12 electrons, it means that the electronic configuration of B is; 1s2 2s2 2p6 3s2. It represent that B must be an element of group 2 since it has an outermost electron configuration of ns2. The elements of group 2 form ionic bonds by loss of two electrons. This implies that B will form bonds by loss of two electrons.
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What is the purpose of the zigzag line on the right side of the periodic table?
a) It marks the border between the alkali metals and the transition metals.
b) It indicates a family of elements that have the same chemical properties.
c) It connects the elements in the table that have the same atomic number.
d) It divides the metals and nonmetals, and shows where the metalloids are.
Answer:
D.
Explanation:
What are the circles around the nucleus called
Answer:
Electron Shells
Outermost level: Valence level
Explanation:
The number of atoms of any element in the given chemical formula is the number that is written on the food of the symbol of that element. The circles around the nucleus called shells or orbits.
What is atom?Atom is the smallest particle of any matter. Atom combines to form element and element combine to form molecule or compound. In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge.
Atom consists of electron, proton and neutron. The total mass of atom is inside the nucleus. Inside the nucleus proton and neutron is there. So calculate mass of an atom, total mass of all protons is added to the total mass of neutron. Electrons revolve around the nucleus in circular path called orbit or shells.
Thus the circles around the nucleus called shells or orbits.
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Which statement best describes the position of a coastal area during a low
tide?
A. It is on a side of Earth that is perpendicular to the Moon.
B. It is on the part of Earth that is experiencing nighttime.
C. It is on the part of Earth that is experiencing daylight.
D. It is on a side of Earth that faces the Moon directly.
Answer:
A is the correct answer
Explanation:
Moon pulls the ocean upwards causing tides
The position of a coastal area during a low tide is: it is on a side of Earth that is perpendicular to the Moon.
What happens during low tide?Whenever the absolute bottom, or the box, arrives at a coast, the coast encounters a low tide. Envision the sea is molded like a ball pointing at the moon. The football's sharp closures address the pieces of the Earth encountering elevated tide and the ball's level sides are the pieces of the earth encountering low tide.
Thus, option A is correct.
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The Earth takes approximately 365.25 days to revolve around
the Sun. To account for the time beyond 365 days, we add a
day to the calendar
The Earth takes approximately 365.25 days to revolve around
the Sun. To account for the time beyond 365 days, we add a
day to the calendar
that's right
How many grams are in 2.94 x 1017 atoms of Iron?
Answer:
8.677
⋅
10
8
g
Explanation:
. Intermolecular forces can exist between:
a. Atoms
b. Molecules
c. lons
d. All of the above
Help
If a mutation changes one base, but the amino acid does not change, what type of effect would this have on the organism?
Neutral
Beneficial
harmful
Carbon dating is a process where scientists evaluate the percentage of Carbon-14 atoms that have decayed to
Carbon-12. The process of changing
from Carbon-14 to Carbon-12 involves the atoms losing two neutrons.
What type of reaction occurs when Carbon-14 changes to Carbon-12?
O Single Replacement
O Fusion
O Decomposision
O Fission
Answer: flood
Explanation:
The type of reaction that occurs when Carbon-14 changes to Carbon-12 is fission reaction. The correct option is D.
What is nuclear fission?Nuclear fission is the operation by which an atom's nucleus splits into two or several smaller nuclei.
Even by radioactive decay's energetic standards, the fission process frequently produces gamma photons and releases a large amount of energy.
Nuclear energy can be used to generate electricity, but it must be liberated from the atom first. Atoms are split to release energy during the nuclear fission process.
The decay of carbon-14 is another nuclear reaction that we can use. Carbon is a necessary element for living organisms that constantly exchange carbon, the majority of which is carbon-12.
However, some of those carbon atoms are carbon-14 isotopes.
Thus, the correct option is D.
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3. What is found around the roots of some plants that turns nitrogen from the form we cannot use to the form we can use?
Answer:
Bacteria
Explanation:
Some plants, specifically leguminous plants form a symbiotic relationship with certain bacteria species called NITROGEN-FIXING BACTERIA in their root nodules. In this relationship, the bacteria species e.g nitrosomonas, nitrobacter etc help the plants fix atmospheric nitrogen (N2) or ammonium compounds, which are forms of nitrogen that are unusable to the plant into nitrates, a usable form.
Therefore, BACTERIA are the organisms found around the roots of these set of plants (legumes) that turns nitrogen from the form we cannot use to the form we can use.
Which of the following statements best describe the movement of particles in a gas
PLS HELP
What is the correct order for this food chain?
A) grass, lion, bacteria
B) antelope, lion, grass
С) antelope, bacteria, grass
D) grass, antelope, lion
Answer:
Creo que es D) grass, antelope, lion
Explanation:
El antílope se alimenta de hierba y el león del antílope.
In an ecosystem, the correct order for the food chain is grass, antelope, lion.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.There are different types of ecosystems present.
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