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Related Questions
The chemical equation below is correctly balanced.
4 Al + 3 O2 → 2 Al2O3
How many moles of Al2O3 will be formed when 27 grams of Al reacts completely with O2?
Answers
Answer:
0.35moles
Explanation:
when 156g of Al reacts with 2molesof Al2O3 then 27g of Al reacts with what then u cross multiply and solve ur answer
0.35moles of Al[tex]_2[/tex]O[tex]_3[/tex] will be formed when 27 grams of Al reacts completely with O[tex]_2[/tex]. A mole consists of precisely 6.022× 10²³particles.
What is mole?A mole is just a measuring scale. In reality, it's one of the International System of Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear.
A mole consists of precisely 6.022× 10²³particles. The "particles" might be anything, from tiny things like electrons and atoms to enormous things like stars or elephants.
4 Al + 3 O[tex]_2[/tex] → 2 Al[tex]_2[/tex]O[tex]_3[/tex]
moles of aluminium = 27 /26=1.03moles
The mole ratio between Al and Al[tex]_2[/tex]O[tex]_3[/tex] is 2:1
mole of Al[tex]_2[/tex]O[tex]_3[/tex]= 0.35moles
Therefore, 0.35moles of Al[tex]_2[/tex]O[tex]_3[/tex] will be formed when 27 grams of Al reacts completely with O[tex]_2[/tex].
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How much of a 0.250 M sucrose solution must be used to prepare 400.0 mL of a 0.0310 M solution? mL
Answers
Answer:
49.6 mL
Explanation:
is the answer, I just did it :)
49.6mL of a 0.250 M sucrose solution must be used to prepare 400.0 mL of a 0.0310 M solution.
What is Molarity?Molarity of a given solution is known as the total number of moles of solute per litre of the solution. A solution that is 1.00 molar (written 1.00 M) contains 1.00 mole of solute for every liter of solution.
Molarity = (No. of moles of solute ÷ Volume of solution in liters)
The unit of molarity is mol L⁻¹.
Molarity is temperature dependent because as temperature changes, volume of the solution also changes.
We can also use the formula-
M1V1 = M2V2
M1 = 0.25
V2 = 400mL
M2 = 0.0310
V1 = ?
V1 = M2V2/ M1
V1 = 49.6mL
Therefore, 49.6mL of a 0.250 M sucrose solution must be used to prepare 400.0 mL of a 0.0310 M solution.
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In a science experiment, Javi concludes that a chemical reaction has occurred. What evidence would support this conclusion?
A
a substance melted
B
a substance's color and odor changed
C
a substance's mass and texture changed
D
new atoms were created
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Answer:
B) a substance's color and odor changed Explanation: A signal that a chemical change has occurred is when its odor (its smell) or its appearance has changed.
At 45.0 C and a pressure of 9.9 kPa a sample of gas has a volume of 1.033 L. If the pressure is increased to 1245 kPa what will the new volume be?
Answers
Answer:
The new volume will be 8.2 x 10⁻³ L or 0.0082 L.
Explanation:
Since our temperature remains constant, apply Boyle's Law:
P₁V₁ = P₂V₂
Plug in the initial pressure and volume on the left side, and the new pressure on the right:
9.9(1.033) = 1245(V₂)
V₂ = (9.9(1.033)) / 1245
V₂ = 8.2 x 10⁻³ L or 0.0082 L
A ballon filled with helium a pure substance or a mixture?
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Answer:
Balloon filled with helium is not a mixture because the gas in it consists of solely helium atoms.
Explanation:
Explanation:
An element is a pure substance as well, because if we fill up a balloon with just helium gas, it will only contain helium atoms.
Which two elements on the periodic table share the same period and are both gases?
A. Hydrogen and Helium
B. Fluorine and Bromine
C. Lithium and Potassium
D. Xenon and Argon
Answers
Hydrogen and Helium are the only elements in the periodic table that share the same period and are based
25) Which of the following would exert the most pressure on the ground? 3 points
A woman standing in running shoes
O A Woman standing in high heels
A woman sitting on the ground
O It doesn't make any difference as long as the weight is the same.
C
ادا آمد
collina abinet avontually
Answers
Answer:
a women standing in high heels
Explanation:
Answer:
A woman standing in high heels
A certain type of material allows electricity to flow through it, but it does not flow quickly or easily through it. Is the material a good or poor conductor? Does it have a low or high resistance?
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Since such a material resists the flow of electric charge, the material can be said to have a high resistance (or high resistivity).
Mathematically, resistance and conductance are reciprocals of one another; a low conductance implies a high resistance, and a high conductance implies a low resistance.
What is an example of an organism that undergoes binary fission?
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Unicellular organisms such as amoeba and leishmania undergo binary fission.
What is binary fission?Binary fission can be described as a form of asexual reproduction where an organism divides into two, each part having one copy of genetic material.
Binary fission can be described as a kind of asexual reproduction observed in prokaryotes and a few single-celled eukaryotes. In asexual reproduction, there is a separation of the parent cell into 2 new daughter cells. This process occurs with the division and duplication into two parts.
Binary fission is a primary of reproduction in prokaryotic organisms. Binary Fission happens without spindle apparatus formation in the cell. The single DNA molecule starts replication and attaches each copy to parts of the cell membrane.
Prokaryotes and eukaryotes such as euglena reproduce via binary fission. This process is rapid, and its speed varies in species. The time needed by bacteria to double the cells it has is called known as doubling time.
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Explain ways humans can reduce global warming. Use 4-5 complete sentences.
pls show your work thx
Answers
Explain ways humans can reduce global warming
The list of ways humans can reduce global warming includes: driving affordable electric cars, increasing the use of wind and solar energy in communities, and reducing water waste like plastic bottles. Greenhouse gases in the atmosphere cause global warming and air pollution. Also, reducing wastage that affects our soil benefits agriculture and freshwater locations. Conserve energy by turning off your lights, walking or riding your bicycle, and invest in solar energy. Solar energy can decrease greenhouse gas emissions in our air that we beathe! Affordable solar energy helps the enviorment and poorer communites with reducing air pollution.
TRUE OR FALSE
“Acids are electrolytes”
Answers
Answer:
True mark brainlest
Explanation:
I need help...well honestly I don't wanna do it so can someone help because this is just confusing....I don't need any citing or whatever just give me a short explication of how Denver is mile high....thank youuu...
Answers
Answer: Denver is named after James W. Denver, a governor of the Kansas Territory. It is nicknamed the Mile High City because its official elevation is exactly one mile (5280 feet or 1609.344 meters) above sea level.
120.0 g of 4.0°C water (Specific Heat: 4.184J/g°C) is heated until its temperature is 35°C. Calculate the amount of heat energy needed to cause this rise in temperature?
Answers
Answer: I got 15.56
Explanation: I am so sorry if that's wrong but I used the equation Q=m×c×ΔT where
m=mass
ΔT= temp change that occurs
c= specific heat capacity
good luck, again sorry if i totally biffed that
Tonsils are lymphatic organs located in the...
A. armpits.
B. bones.
C. throat.
D. ribs.
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Answer:
C. throat
Explanation:
how is liming a lake similar to a doctor prescribing medicine for a patient?
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was
4. When a 1.25-gram sample of limestone, that contains CaCO3 (molar mass = 100 g/mol) and inert impurities
dissolved in acid, 0.22 grams of CO2 was generated (molar mass = 44 g/mol). What was the percent of CaCO3 by
mass in the limestone?
CaCO3 + CO2 + CaO
(a) 20%
(6) 40%
(c) 67%
(d) 80%
(e) 100%
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chemistry-mole calculations
Answers
Answer:
somebody answer this please>>>!!!
Explanation:
!!!
5 Facts about cell division
Answers
Apply Concepts H2O and H2O2 are binary molecular compounds generally known by their common names, “water” and “hydrogen peroxide.” Following the naming conventions you identified for molecular compounds, what would their names be? Explain your reasoning.
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A compound that consists of two non-metal elements in its structure and compound is called a binary molecular compound. They can have two different elements in their structures bonded by various bonds like carbon dioxide, sodium chloride etc.
The naming of [tex]\rm H_{2}O[/tex] is dihydrogen oxygen and of [tex]\rm H_{2}O_{2}[/tex] is dihydrogen dioxygen.
How to name binary molecular compounds?[tex]\rm H_{2}O[/tex] is a water molecule and is a binary molecular compound as it has one element of oxygen and other elements of hydrogen. The compound has two hydrogen and one oxygen atom and thus will be named dihydrogen oxygen.[tex]\rm H_{2}O_{2}[/tex] is the peroxide and is a binary molecular compound as it also has hydrogen and oxygen element in its structural formula. The compound has two oxygen and two hydrogen elements in its structure and therefore, will be named dihydrogen dioxygen.Thus, the naming of water is dihydrogen oxygen and hydrogen peroxide is dihydrogen dioxygen.
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In the water cycle, clouds form as a result of A. Precipitation. B. Transportation. C. Evaporation. D. Condensation. Please HELPPPP. 15 PIONTS!!!!¡!
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Answer: D. Condensation
Explanation: because condensation happens when water vapor cools and turns into clouds
Coke in a Coca Cola bottle has a volume of 500 ml and a mass of 756 grams. What is its density
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Answer: 1.11 g/mL is the density
Question 19 (3 points)
If the density of the earth was 11.0 g/mL instead of its measured value of 5.51 g/mL, the force of gravity would
be twice what it is at sea level. If the earth's density was twice than its actual density, then in pounds per
square inch at sea level the earth's atmosphere in British units would be equal to:
a) 7.35 psi b) 14.7 psi c ) 29.4 psi d) 44.1 psl e) 98.8 psi
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Answer:
c ) 29.4 psi
Explanation:
If the density of earth was twice than its actual density which is 5.51 g/mL, then at sea level the atmospheric pressure of earth in British units would be equal to 29.4 psi because increase of gravity, increase occurs in the atmospheric pressure. If we double the gravity of earth by double of the earth density, so the weight of that same mass of air will be double which leads to the doubling of the atmospheric pressure at the sea level.
Which best represents the number of moles in exactly 108 grams of gold?
Answers
Answer: 0.548 mol
Explanation:
Pls no links can someone pls tell me what to put to fill in the blanks please someone?????
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Answer: you go down by your key bad and use those arrows
Explanation:
Which statement about elements is true?
All substances are made up of elements.
There are approximately 50 elements.
An element is made up of different types of atoms.
Most elements are nonmetal.

Answers
Answer:
first one is right.
there are 117 elements, so 2nd option is wrong.
elements are made up of one type of atoms, so 3rd is also wrong.
most elements are metal. so 3rd is wrong
A sample of neon gas occupies a volume of 752ml at 25 degrees Celsius. What
volume will the gas occupy at 50 degrees Celsius if the pressure remains
constant?
Answers
Answer:
The volume of the gas will be 814 mL.
Explanation:
An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
The gas laws are a set of chemical and physical laws that allow determining the behavior of gases in a closed system. The parameters evaluated in these laws are pressure, volume, temperature and moles.
Charles's Law consists of the relationship that exists between the volume and the temperature of a certain quantity of ideal gas, which is kept at a constant pressure, by means of a constant of proportionality that is applied directly. For a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature is directly related to the energy of the movement of the gas molecules. .
In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
It is desired to study two different states, an initial state and an final state. You have a gas that is at a volume V1 and at a temperature T1 at the beginning of the experiment. When the temperature varies to a new T2 value, then the volume will change to V2, and the following will be true:
[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]
In this case:
V1= 752 mLT1= 25 C= 298 K (being 0 C= 273 K)V2= ?T2= 50 C= 323 KReplacing:
[tex]\frac{752 mL}{298 K} =\frac{V2}{323 K}[/tex]
Solving:
[tex]V2= 323 K*\frac{752 mL}{298 K}[/tex]
V2= 815 mL
The volume of the gas will be 814 mL.
electrolytic dissociation of ethanoic acid pls
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CH3 CH3 CH3-CH2-CH=CH-CH-CH-C-CH-CH3 CH3 COMO SE LLAMA?
Answers
What do u need help with
which statement best describes the importance of chemical equations while solving stoichiometry problems?
Answers
Answer:
a
Explanation:
A balanced chemical equation shows reacting ratios of all substances involved in reaction in terms of grams which is important while solving stoichiometry problems.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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PLZ HELP!
Are water waves transverse or longitudinal? How do you know? IN YOUR OWN WORDS.
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Answer:
sound waves in air and water are longitudinal. Their disturbances are periodic variations in pressure that are transmitted in fluids. Figure 13.5 the wave on a guitar string is transverse