Answer:
A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.
Explanation:
I hope this helps
Why do you think the different heating process result in different softness or hardness of the steel? Think about what steel is made of and how the atoms move .
Explanation:
Different heating process affect the microstructure of the steel in different ways. Thus, imparting different properties to the steel. For example, annealing is done is done to impart softness to steel, hardening is done to hardened the steel( eg: carburizing, nitriding, cyaniding) whereas tempering is done to improve the ductility of the steel.
Steel mainly contains iron and carbon. This percentage of carbon and iron decides the property of the steel. It is the % of carbon which is altered in different heating process that to obtained the desire microstructure in steel.
Consider the following reaction:
10 KCIO3 + 3 P4 → 3 P4010 + 10 KCI
Given 30 moles of P4 and 86 moles of KCIO3, which would act as the limiting reactant?
Answer: [tex]KClO_3[/tex] is the limiting reactant in the given reaction.
Explanation:
Limiting reagent is defined as the chemical specie which gets totally consumed in the reaction and the formation of product is dependent on this reagent.
We are given:
Moles of [tex]P_4[/tex] = 30 moles
Moles of [tex]KClO_3[/tex] = 86 moles
The given chemical equation follows:
[tex]10KCIO_3+3P_4\rightarrow 3P_4O_{10}+10KCI[/tex]
By Stoichiometry of the reaction:
If 10 moles of [tex]KClO_3[/tex] reacts with 3 moles of [tex]P_4[/tex]
Then, 86 moles of [tex]KClO_3[/tex] will react with = [tex]\frac{3}{10}\times 86=25.8moles[/tex] of [tex]P_4[/tex]
As, given amount of [tex]P_4[/tex] is more than the required amount. So, it is considered as an excess reagent.
Therefore, [tex]KClO_3[/tex] is considered as a limiting reactant because it limits the formation of product.
The picture below shows the positions of the Earth, Moon, and Sun during an eclipse.
What is true of the eclipse shown in the picture?
A.
It is a lunar eclipse, in which the Earth casts a shadow on the Moon.
B.
It is a solar eclipse, in which the Earth casts a shadow on the Moon.
C.
It is a lunar eclipse, in which the Moon casts a shadow on the Earth.
D.
It is a solar eclipse, in which the Moon casts a shadow on the Earth.
Answer:
it is option c liner eclipse
Answer:
A-It is a lunar eclipse, in which the Earth casts a shadow on the Moon.
Increased human population will most likely have which consequence? *
A: decrease global warning
B: increase the use of fossil fuels
C: increase animal habits
D:replenish Fish species in our Ocean
Please help with my homework
Answer:
B its most likely sorry if im wrong :D :(
Explanation:
9) Given the reaction: N2(g) + O2(g) + 182.6 kJ → 2 NO(g) What is the heat of formation of nitrogen (II) oxide in kJ/mole? A) AH = -182.6 B) AH = -91.3 C) AH = 91.3 Show D) AH = 182.6
PLEASE HELP please
The heat of formation of nitrogen (II) oxide : +91.3 kJ/mol
Further explanationGiven
Reaction
N2(g) + O2(g) + 182.6 kJ → 2 NO(g)
Required
The heat of formation
Solution
In the above reaction, the heat of the reaction is located on the reactant side which indicates that the formation of nitric oxide requires heat (endothermic reaction).
In the above reaction the heat required to form 2 moles of NO, so the heat required for each mole is:
+182.6 kJ : 2 = =+91.3 kJ/mol
The temperature of the system is highest when it is a
A. gas
B. liquid
C. plasma
D. solid
Answer:
gas
Explanation:
its either gas or plasma but gas should be it bc liquid and solid are cold
How many protons and electrons are in a
Cu 2+ ion?
64
29
A 27 protons, 29 electrons
27 protons, 31 electrons
B
29 protons, 27 electrons
D
29 protons, 31 electrons
Answer:
B 29 protons, 27 electrons
Explanation:
The given specie is copper ion:
Cu²⁺
We are to find the number of protons and electrons it contains.
The number of protons is the positively charged particles in the atom.
Electrons are the negatively charged particles in the atom.
The number of protons is the same as the atomic number
Atomic number of copper = 29
Number of protons = 29
Now;
Charge = Number of protons - Number of electrons
2 = 29 - number of electrons
-27 = - number of electrons
Number of electrons = 27
Meiosis goes through 2 divisions to create four unique haploid cells. true or false
Answer:
True
Explanation:
True is the ANSWER.
why is it called the periodic table of elements (why is the word periodic in it)
Answer:
It is called "periodic" because elements are lined up in cycles or periods. From left to right elements are lined up in rows based on their atomic number (the number of protons in their nucleus). ... Each horizontal row in the table is a period. There are seven (or eight) total periods.
Explanation:
2. Convert 5.3 x 1025 molecules of CO2 to moles.
ANSWER:
moles CO2 = 88 mol
EXPLAIN:
In order to go from molecules of CO2 to moles of CO2, we have to use the following relationship:
I usually set up dimensional analysis questions like this:
Quantity sought = Quantity given x conversion factor
Quantity sought → mol CO2Quantity given → 5.3×1025 moleculesConversion factor → 1mol/6.02×10∧23Now we just plug the values into the format I have above (make sure your units cancel out as you are going through this process, that's how you know if you are doing the calculations correctly or not):
moles CO2 = 5.3×10∧25 molecules×1mol/6.02×10∧23 molecules
moles CO2 = 88 mol
1. How is the atom count for each element on the reactant side of a balanced chemical equation related to the atom count for each element on the product side of the same equation?
Answer: The atom count for each element on the reactant side of a balanced chemical equation is equal to the atom count for each element on the product side of the same equation
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products formed must be equal to the mass of reactants taken.
In order to get the same mass on both sides, the atoms of each element must be balanced on both sides of the chemical equation.
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
Thus there are 4 atoms of hydrogen on reactant as well as product side.
Also there are 2 atoms of oxygen on reactant as well as product side.
Question 1
Organisms sharing a common ancestor
Evolutionary history
A. Fossil record
B.Anatomy
C.Common ancestry
D.Evolution
Answer:
Fossil record
Explanation:
but first think about it befor you do so it could be wrong im not a computer
Please help me it’s due tmrw
1. In this section, you read about firefighters cleaning
up a hazardous spill of a base. This is the chemical
reaction they used:
H3PO4 + 3 KOH → K3PO4 + 3 H2O
(a) What type of reaction is this?
(b) Write the general equation for this kind of
reaction. Compare the equation above with the
general equation.
(c) Name the reactants
D) Name the products
a. double replacement
b. AB + CD ⇒ AD +CB
c and d
H₃PO₄ : Phosphoric acid
KOH : Potassium hydroxide
K₃PO₄ : Tripotassium phosphate
H₂O : water
Further explanationGiven
Reaction
H₃PO₄ + 3 KOH → K₃PO₄ + 3 H₂O
Required
Type of reaction
General equation
Name of reactants and product
Solution
Type of reaction :Double replacement reaction : Cations and anions of different compounds switch places
It can also be said as a neutralization reaction because it produces water(reaction between an acid and a base)
General equation :AB + CD ⇒ AD +CB
Name of reactants and productsH₃PO₄ : Phosphoric acid
KOH : Potassium hydroxide
K₃PO₄ : Tripotassium phosphate
H₂O : water
Which of the following is smaller than the atomic radius of oxygen (O)?
A. The ionic radius of sulfur (S)
B. The ionic radius of oxygen (O)
C. The atomic radius of fluorine (F)
D. The atomic radius of sulfur (S)
Answer:
C
Explanation:
Fluorine has a smaller atomic radius than oxygen.
Thomson's plum pudding model of the atom was most directly replaced or refuted by
a. Rutherford's discovery that atoms contain a nucleus
b. Chadwick's discovery of the neutron
c. Goldstein's discovery of protons
d. Democritus's idea that the atom is indivisible
Answer:
A. Rutherford's discovery that atoms contain a nucleus
Explanation:
Answer:
A is the answer
Explanation:
Radiation can travel through A. liquids B. gases C. empty space D. all of these
Answer:
Liquids
Explanation:because animals like dolphins use sound radiation under water to hear each other
Answer:
D. all of these.
Explanation:
it can travel through solids, liquids, and gasses.
Balance the Chemical Equations
Rb + RbNO3---> Rb2O + N2
please help me
Answer:
10Rb° + 2RbNO₃ => 6Rb₂O + N₂
Explanation:
Given: Rb° + RbNO₃ => Rb₂O + N₂
=> 1st balance rubidium in RbNO₃ against Rb₂O by inserting a '2' coefficient before RbNO₃ and a '6' coefficient before Rb₂O
=> Rb° + 2RbNO₃ => 6Rb₂O + N₂ => Oxygen and Nitrogen are balanced. All that remains is balancing Rb by inserting a '10' coefficient.
=> 10Rb° + 2RbNO₃ => 6Rb₂O + N₂
Note: In balancing chemical equations, saving an element that is not part of a compound until last frequently gives balance by inspecting the number of elements of the specific kind and boosting its coefficient to balance the equation.
Balanced equation => 10Rb° + 2RbNO₃ => 6Rb₂O + N₂
The balanced chemical reaction can be of the equation given is [tex]2Rb + RbNO_3 - > Rb_2O + N_2[/tex].
We need to make sure that the amount of atoms of each element is the same on both sides of the equation in order to balance the chemical equation [tex]Rb + RbNO_3- > Rb_2O + N_2[/tex].
By counting the atoms in each element, we may begin to balance the equation. We have one Rb, one Rb, one N, and three O atoms on the left side. We have two Rb, one N, and two O atoms on the right side.
We can add a coefficient of 2 in front of [tex]RbNO_3[/tex] to balance the Rb atoms, which gives us:
[tex]2Rb + RbNO_3 - > Rb_2O + N_2[/tex]
Thus, now, the equation is balanced with two Rb atoms on both sides.
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what is one example of a electromagnetic wave
Answer:
Examples of EM waves are radio waves, microwaves, infrared waves, X-rays, gamma rays, etc.
Answer:
Electromagnetic waves can be split into a range of frequencies. This is known as the electromagnetic spectrum. Examples of EM waves are radio waves, microwaves, infrared waves, X-rays, gamma rays, etc.
Explanation:
Calculate the answer to the following questions and round to the correct # of
significant digits
518,000/2,500
Part C
How did Dr. Tierno find the answer to his question?
Answer:
Dr. Tierno tested the pillows for signs of microorganisms. He took samples from the pillow, then he grew the microorganisms in a petri dish.
Explanation:
This is the answer on edmentum
i need help asap!! i will give brainliest
Which elements are common to all organisms? Which ones apply??
A.sodium
B.oxygen
C. Sulfur
D. Hydrogen
E. iron
F. phosphorus
Answer:
B D
Explanation:
hope this is right but not entirely sure
What is the percent composition of Cs in CsPO4?
Answer:
58.3%
Explanation:
The formula of the compound is given as:
CsPO₄
Now, the percentage composition of Cs in the compound is = ?
So;
To find this parameter, find the molar mass of the compound:
Molar mass of CsPO₄ = 132.9 + 31 + 4(16) = 227.9g/mol
Percentage composition of Cs= [tex]\frac{132.9}{227.9} x 100[/tex] = 58.3%
4. Why is it important to neutralize an acid spill
before attempting to clean it up?
Answer:
It the acid easier to handel
How do you draw a lewis structure?
Answer:
How to Draw a Lewis Structure.
Step 1: Find the Total Number of Valence Electrons.
Step 2: Find the Number of Electrons Needed to Make the Atoms "Happy".
Step 3: Determine the Number of Bonds in the Molecule.
Step 4: Choose a Central Atom.
Step 5: Draw a Skeletal Structure.
Step 6: Place Electrons Around Outside Atoms.
Explanation:
Hope this helped! :)
According to your investigation in part A, how do strong acids differ from weak acids? Select all the correct answers. Strong acids contain more A− than weak acids do. Strong acids contain more H3O+ than weak acids do. Strong acids contain more HA than weak acids do. Strong acids contain more OH− than weak acids do.
Answer:
Strong acids contain more A− than weak acids do.
Strong acids contain more H3O+ than weak acids do
Explanation:
When we talk about a strong acid, we are referring to any acid that is completely dissociated or ionized when it is in an aqueous solution.
It is very eager to lose a proton, H+ in solution according Arrhenius definition.
In aqueous solution, a strong acid ionizes as follows:
HA(aq) + H2O → H3O+(aq) + A−(aq)
Since, strong acids ionize completely in solution, strong acids contain a greater H3O+ and A− concentration than solutions of weak acids.
Answer:
A. Strong acids contain more A− than weak acids do.
B. Strong acids contain more H3O+ than weak acids do.
D. Strong acids contain more OH− than weak acids do.
Explanation:
Plato correct
CHEMISTRY QUESTIONS // 30 POINTS
WILL GIVE BRAINLIEST
1. All nonmetals (except hydrogen) have 8 valence electrons?
True or False
2. The N^-3 ion is classified as a(n) ____ and has ____.
A. anion, 8 valence electrons
B. cation, 8 valence electrons
C. anion, 15 valence electrons
D. anion, 3 valence electrons
3. If two nonmetals react to form a compound and have very different _____ they form ____ bonds. If there is a small difference, then they form ____ bonds.
A. ionization energy; covalent; nonpolar ionic
B. electronegativity; nonpolar covalent; polar covalent.
C. ionization energy, ionic, nonpolar covalent
D. electronegativity, polar covalent, nonpolar covalent.
Answer:
yesyeysesyesyesyesteys
What is the name of this compound S2I4?
Answer:
Di Sulphur tetraiodide is the chemical compound with the formula S2I4
Explanation:
A breeder reactor is one type of nuclear reactor. In a breeder reactor, uranium-238 is transformed in a series of nuclear reactions into plutonium-239.
The plutonium-239 can undergo fission as shown in the equation below. The X represents a missing product in the equation.
Compare the amount of energy released by completely fissioned plutonium-239 to the amount of energy released by the complete combustion of the same amount of coal.
Answer:hope this help
Explanation:
Which of the following correctly shows the relationship, in terms of number of particles, of the three substances?
A. 1 mole of water < 1 mole of helium < 1 mole of aluminum
B. 1 mole of aluminum = 1 mole of helium = 1 mole of water
C. 1 mole of aluminum < 1 mole of helium < 1 mole of water
D. 1 mole of helium < 1 mole of aluminum < 1 mole of water
The correct option which shows the relation between particles of the three substances is 1 mole of aluminum = 1 mole of helium = 1 mole of water.
What is a particle?
A particle is a small part of matter.
The term refers to particles of all sizes, ranging from subatomic particles like electrons to visible particles like dust particles floating in sunlight.
The relationship of a number of particles of the substance can be calculated by Avogadro's law
Thus, the correct option is B. 1 mole of aluminum = 1 mole of helium = 1 mole of water
Learn more about particles
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