Answer:
3.38 moles of O2.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
4CH2OH + 5O2 → 4CO2 + 6H2O
From the balanced equation above,
4 moles of CH2OH required 5 moles of O2 for complete combustion.
Finally, we shall determine the number of mole of O2 needed to react with 2.7 moles of CH2OH. This can be obtained as follow:
From the balanced equation above,
4 moles of CH2OH required 5 moles of O2 for complete combustion.
Therefore, 2.7 moles of CH2OH will require = (2.7 × 5)/4 = 3.38 moles of O2 for complete combustion.
Thus, 3.38 moles of O2 is required.
Evaluating Lewis Structures
Explain what is wrong with the following structure.
An upper H is single-bonded to a H to the right, which is single bonded to an upper O with pairs of dots above, to the left, and below.
Answer:
Hydrogen cannot have more than two electrons. Hydrogen bonds to only one other atom at a time.There are too many electrons in the final structure.
Explanation:
Answer:
Explanation:
Hydrogen cannot have more than two electrons. Hydrogen bonds to only one other atom at a time. There are too many electrons in the final structure.
Choose the electron configurations which are possible for an unexcited atom. Example 1 – 1s22s22p4 Example 2 – 1s22s22p63s23p33d1 Example 3 – 1s22s22p83s1 Example 4 – 1s22s22p63s1
Answer:
Examples 1, 3 and 4
Explanation:
An unexcited atom is an atom in the ground state i.e the atom has it's valence electrons in it's lowest energy level possible. This actually implies the normal electronic configuration of the atom. Thus, examples 1, 3 and 4 have the actual electronic configuration with there valence electrons in the lowest possible energy level.
Example 1: 1S² 2S² 2P⁴
Example 3: 1S² 2S² 2P⁶ 3S¹ (There seem to be a mistake in the question provided, P energy level can only 6 electrons not 8)
Example 4: 1S² 2S² 2P⁶ 3S¹
NOTE: If you take a look at example 2, it will be deduced that the 3P energy level has only 3 valence electrons and the last valence electron jumped to 3d energy level; making that atom appear to be in it's excited state.
as water cruise to a temperature of zero degrees Celsius and form ice water molecules tend to
A. move faster apart
B. vibrate rapidly
C. flow more randomly
D. gradually expand
Answer:
B. vibrate rapidly
Explanation:
Mark above answer as BRILLIANT
If an object has a volume of 3 cm3 and has a density of 9 g/cm3. What is the mass of the object?
3 grams
6 grams
27 grams
81 grams
Answer:
The answer is 27 gramsExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question we have
mass = 9 × 3
We have the final answer as
27 gHope this helps you
Acid rain is an example of _____________ weathering
Answer:
a chemiacal
Explanation:
The energy released in cellular respiration helps an athlete perform. How do you think an athlete might be able to increase cellular respiration?
pls i will give brainliest
eating healthy foods
working out and eating healthy helps
Answer:
higher as
beacause having a healthy diet inproves
your health
Explanation:
If the half-life of a radioisotope is 250 years how much of a 96.0 gram sample will remain after 750 years
Answer:
12 grams
Explanation:
96g=0 years
48g=250 years
24g=500 years
12g=750 years
There are _____ Chemical families in the periodic table.
Explanation:
18
In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table; the f-block columns (between groups 3 and 4) are not numbered.
The more quickly you change your _____, the more ____ you will have to exert
Answer:
name, force
Explanation:
is this a balanced equation?
Answer:
C6 H12 O6 +6 O 2 → 6 CO2 + 6 H2 O
A physical property tells how a substance changes into a new substance
Answer:
false
Explanation:
7. At what structures in the lungs do the exchange of oxygen and carbon dioxide take place?
A. Bronchi B. Alveoli C. Bronchioles D. Trachea
LA
Answer:
Answer is Alveoli
Hope it helps.... plz mark as brainliest
write the name of and molecular formula of compound which gives hydrogen ion and chloride ion in the solution state. in which colour is the methyl orange changed after treating it with this compound. why? write the name of salt when the compound is treated with lime water. write the chemical equation.
i need to know what word goes into that the words are in each sentence plz help me i will give brainliest thank you :)
Answer:
im taking these points baby lol
Explanation:
i love you <3
How do volcanos such as ojos del salado form?
Answer:
Deep inside Earth, between the molten iron core and the thin crust at the surface, there is a solid body of rock called the mantle. When rock from the mantle melts, moves to the surface through the crust, and releases pent-up gases, volcanoes erupt.
Explanation: hot molten rock, ash, and gases escape from the volcano
During active transport, molecules move from areas of ______________ to _______________. This requires the use of _________.
Which statement describes the charging method shown?
The spheres are charged through friction.
The spheres develop the same charge.
Electrons move from the rod to Sphere A.
Electrons move from Sphere A to Sphere B.
Answer:
D
Explanation:
correct on edge 2021 :)
The movement of the electrons from sphere A to sphere B is shown as the charging method. Thus option D is correct.
What is an electron?An electron is a negatively charged subatomic particle and can either be free or bound to the nucleus and it exists in a spherical shell. of the various radii that represent the energy levels. The movement of the electron from sphere one to sphere two is represented by the image.
Find out more information about the charging method.
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write the number 3000,000,000 in scientific notation
Answer:
3 x 10^9
Explanation:
How many electrons does gallium give up when it becomes an ion?
Answer:
3 electrons comrade
Explanation:
giveaway!! 2 more coming up.
hope you get it ! <3
Answer:
k
Explanation:
Thank you for hosting <3
Help with chemistry question. Look at image.
Answer:
It is called the periodic table because of the way he elements are arranged. You'll notice they're in row and columns. The horizontal rows are called periods and the vertical columns are called groups. (so I believe it's A or C) sorry if I get this wrong..
A teacher attaches two slinky springs to a fixed support. The springs are moved, as shown in the image. Wave A wave B What property of the wave does the teacher change in the movement of each slinky? amplitude,frequency, speed, or wavelength
Answer:
a changes more because it going higher
Explanation:
Answer:
They will be the same because amplitude doesn't affect speed. A physics teacher attaches a slinky to the wall and begins introducing pulses with different wavelength. The denser the medium at the compression, the greater the amplitude of the wav
Explanation:
Consider the following reaction: 4HCl(g)+O2(g)→2H2O(g)+2Cl2(g) Each of the following molecular diagrams represents an initial mixture of the reactants.(Figure 1)
How many molecules of Cl2 would be formed from the reaction mixture that produces the greatest amount of products?
Answer:
A
Explanation:
The number of molecules of Cl₂ that would be formed from the reaction mixture that produces the greatest amount of products is 4.
What are molecular diagrams?Molecular diagrams are the representations of the chemical reaction, with the help of molecular orbital theory. They show the chemical bonding and linear combination of the elements.
Now, here the reaction is
4HCl(g)+O₂(g)→2H₂O(g)+2Cl₂(g)
Diagram b has 8 molecules of HCl (limit reagent) and 3 molecules of O₂. This is the reaction that will produce the greatest amount of product.
Hence, b is taken for the number of chlorine.8 molecules of HCl need to combine with 2 molecules of oxygen to produce 4 molecules of Cl₂. The reaction's stoichiometry shows this to be the case.
Thus, there will be four, 4 molecules of chlorine that would be formed from the reaction.
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What is a limiting reagent? A.) The reactant that is used up first in a reaction B.) The reactant that is used the least reactive in a reaction C.) the reactant with the smallest coefficient in the equation D.) the reactant with the largest coefficient in the equation
Answer: A.) The reactant that is used up first in a reaction
The reactant that is totally consumed during a reaction, or the limiting reagent, decides when the process comes to an end. A limiting reagent is the reactant that is used up first in a reaction. Therefore, option A is correct.
What is a limiting reagent?A reactant that is completely consumed at the end of a chemical reaction is known as the limiting reagent. Since the reaction cannot proceed without this reagent, the amount of product that can be produced is constrained.
The limiting reactant is the one that is consumed first and sets a limit on the quantity of product(s) that can be produced. Calculate how many moles of each reactant are present and contrast this ratio with the mole ratio of the reactants in the balanced chemical equation to get the limiting reactant.
The terms limiting reagent and limiting agent may also be used to describe the limiting reactant.
Thus, option A is correct.
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Which of the following geographical features acted as a natural defense for Egypt against enemies from the south? A. the Nubian desert B. the Mediterranean Sea C. the cataracts of the Nile D. the black silt on the river banks Please select the best answer from the choices provided A B C D
Answer:
C
Explanation:
The geographical features acted as a natural defense for Egypt against enemies from the south is cataracts of Nile. Hence, option C is correct.
What is cataracts of Nile ?The Nile River, one of Egypt's most notable natural features, was the envy of neighboring civilizations and allowed the Egyptians maintain contact with populations in the Mediterranean region.
Huge deserts extend well beyond the lush terrain that surrounds the Nile River on both sides. The Sahara Desert, the world's biggest desert, is to the west. More desert and the Red Sea may be found east of the Nile. These deserts served as an excellent natural defense against invaders.
The Egyptians had built-in fortifications thanks to the river and the desert. The delta of the Nile River is swampy. Egypt was unable to construct a port at the mouth of the Nile as a result. Invaders found it hard to approach Egyptian villages along the river as a result.
Find more on Nile river:
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What do small-scale convection currents create?
A. Solar winds
B. Prevailing winds
C. Global winds
D. Local winds
Answer:
Local Winds
Explanation:
Answer: I think it would be D. Local winds
Explanation: Sorry if I am wrong.
Hope this helps :)
Which of the following contains the most atoms?
24.305 g Mg
39.098 gk
21.62 g B
9.0122 g Be
Explanation:
9.0122 g be Maybe, sorry i don't think so
In the above , the sample of B 21.62 g of boron contains the most atoms because it has approximately 2 moles, while the other samples have only 1 mole each.
What is atomsThe molar mass of each element can be found on the periodic table.
The molar mass of Mg (magnesium) is about 24.305 g/mol.The molar mass of K (potassium) is about 39.098 g/mol.The molar mass of B (boron) is approximately 10.81 g/mol.The molar mass of Be (beryllium) is about 9.0122 g/mol.To calculate the number of moles in each sample, we divide the mass of each sample by its respective molar mass:
For Mg: Number of moles = 24.305 g / 24.305 g/mol = 1 moleFor K: Number of moles = 39.098 g / 39.098 g/mol = 1 moleFor B: Number of moles = 21.62 g / 10.81 g/mol ≈ 2 molesFor Be: Number of moles = 9.0122 g / 9.0122 g/mol = 1 moleTherefore, the sample with 21.62 g of boron (B) contains the most atom
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Please help me with these questions... please..
Imagine you are a scientist who has just discovered a new element. The element has an atomic number of 113, and it has three elections in the outer energy level of each atom.
Which element would have properties most similar to the new element?
Group of answer choices
A.boron
B.carbon
C.hydrogen
D.beryllium
What would you name this new element?
Answer:
3 valence electrons
The element with the atomic number 113 would fall in the 13th column of the periodic table Group IIIA. This group has an electron configuration that would end as p1 , meaning there would be 3 valence electrons. The valence electrons are the electrons found in the highest energy level in the s and p orbital.
Explanation:
Nihonium has to be the #113 element of the periodic table
A. is the correct answer because Boron has 3 electrons too,
All elements in Group 13 have three electrons in their outermost energy level. The two most popular elements in this group are Boron and Aluminum.
Boron element would have properties most similar to the new element. Therefore, option (A) is correct.
Why do the elements of same group have similar chemical behavior?The chemical properties of elements depend on the number of valence electrons in their valence shell. Elements in the same group in the modern periodic table have the same number of valence electrons. Therefore, chemical elements situated in same group of the modern periodic table have similar chemical behavior.
The chemical elements having an identical outer electronic configuration in their atoms are placed in the same group of the periodic table. These valence electrons of an element are responsible chemical behavior and reactivities of the elements.
Therefore, both Boron and a new element with atomic number 113 have three electrons in their valence shells. So they belong to the same group and will have similar chemical properties.
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In metallic bonding, which of these particles are able to move around freely?
A.) protons
B.) electrons
C.) neutrons
Answer:
Electrons
Explanation:
They mad chillin da electron cloud.
Which type of substance have a definite shape and fixed volume?
Solids only
Liquids and solids
Gases only
Liquids and Gases