Give two limitations of law of Constant Composition
Answer:
1.The law does not hold true if the different isotopes of the element are involved in making chemical compound.
2.The law is not applicable when elements combine in the same ratio but different compounds are formed.
What is the proper value for F in the above table? A. 28 B. 30 C. 2+ D. 2-
Explanation:
charge = proton - electron
charge = 65-63
charge = +2
Answer:here is ur answer....
Explanation:
C) 2+
3. How many moles of H20 are in 15.2 grams of pure ice?
Answer:
18.01528 grams.
Explanation:
Ther are 0.84 moles of [tex]H_{2}O[/tex] in 15.2 g of pure ice.
The molar mass of [tex]H_{2}O[/tex] is 18g.
To calculate the number of moles of a substance in a given mass of the sample, we divide the given mass by the molar mass of the sample,
Number of moles = given mass / molar mass
It is given that we have 15.2g of pure ice. Then the number of moles of [tex]H_{2}O[/tex] will be:
n = 15.2/18
n = 0.84 moles.
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i just need help grouping them
Answer:
Potassium: 1 Stratum: 2 Sodium: 1 Copper: 11 Calcium: 2 Lithium:1
Explanation:
The groups are columns on the periodic table
A molecule forms when
A. 2 or more atoms are bonded covalently.
B. 2 or more atoms are bonded ionically.
C. 2 or more atoms transfer electrons to a nonmetal.
I really need your guys help, I need to pass.
Answer:
Question 4 is 291.0346
Explanation:
I need help with my worksheet
Balance the equation
__Nal +__ F = ___NaF + __l
2 2
Answer:
2NaI + F₂ → 2NaF + I₂
Explanation:
Chemical equation:
NaI + F₂ → NaF + I₂
Balanced chemical equation:
2NaI + F₂ → 2NaF + I₂
The given reaction is single replacement reaction.
Step 1:
NaI + F₂ → NaF + I₂
left hand side Right hand side
Na = 1 Na = 1
I = I I = 2
F = 2 F = 1
Step 2:
2NaI + F₂ → NaF + I₂
left hand side Right hand side
Na = 2 Na = 1
I = 2 I = 2
F = 2 F = 1
Step 3:
2NaI + F₂ → 2NaF + I₂
left hand side Right hand side
Na = 2 Na = 2
I = 2 I = 2
F = 2 F = 2
Which element has 7 valence electrons and 3 electron shells
Answer:
Halogens i think. hope this help
Explanation:
Although the order of elements is based on atomic number, vertical families share similar chemical properties.
Question 12 options:
True
False WHAT IS IT
Answer:
It's true
Explanation:
Uhhh, the internet! lol.
Answer:
It's true, ExplanationVVVExplanation: Because the order of elements is based on atomic number, vertical families share similar chemical properties.
Which of the following halogens has the weakest attraction for electrons?
I
F
Br
Cl
Answer:
I
Explanation:
Among the halogens given in this problem, iodine has the lowest attraction for electrons.
This property is known as electronegativity.
Electronegativity is expressed as the relative tendency with which the atoms of the element attracts valence electrons in a chemical bond.
As you go down the periodic group the electronegativity decreases. The most electronegative element on the periodic table is fluorine. Down the group, iodine is the least electronegativeThis is due to the large size of its atom.Explain in a short sentence how you can tell if a reaction is a combustion reaction.
The reactants react with oxygen and there is energy formed.
What type of circuit is seen in the picture?
3 light bulbs and a battery connected with one loop of wire
Question 1 options:
series
AC
parallel
open
Answer:
C!!!!!!!!!!!!!!!!!!!!
Explanation:
Hope this helps!!!!!!!!!
I'm pretty sure it's a series circuit because all components are connected end-to-end, forming a single path for current flow.
what mass of carbon dioxide is produced from combustion of 100.0 grams of propane (C^3H^8)
Answer:
Mass of CO₂ produced = 299.64 g
Explanation:
Given data:
Mass of CO₂ produced = ?
Mass of propane (C₃H₈) = 100.0 g
Solution:
Chemical equation:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Number of moles of propane:
Number of moles = mass/molar mass
Number of moles = 100.0 g/ 44.1 g/mol
Number of moles = 2.27 mol
Now we will compare the moles of propane and carbon dioxide.
C₃H₈ : CO₂
1 : 3
2.27 : 3/1×2.27 = 6.81 mol
Mass of CO₂:
Mass = number of moles × molar mass
Mass = 6.81 mol × 44 g/mol
Mass = 299.64 g
Which statement about anabolism is true?
A. In anabolism, energy is released.
B. In anabolism, energy is absorbed.
C. In anabolism, energy is absorbed and then released.
O
D. In anabolism, energy is released and then absorbed.
Answer:
i would say B? Im sorry if im wrong
Explanation:
i think that because Catabolic reactions release energy, while anabolic reactions use up energy. Anabolism is the opposite of catabolism.
Answer:
B) In anabolism, energy is absorbed.
If the temperature of a gas increased from 100 K to 200 K and the volume of a gas decreased from 20 L to 10 L, what is the new pressure if the original pressure was kPa?
Answer:
320pka
Explanation:
This is a complete question;
If the temperature of a gas increased from 100 K to 200 K and the volume of a gas decreased from 20 L to 10 L, what is the new pressure if the original pressure was 80kPa?
EXPLANATION;
Gas laws can be regarded as aws which relate the pressure, volume, as well as temperature of a gas. It can be expressed as
P1V1/T1 = P2V2/T2
Where
V1= initial volume= 20L
V2 = final volume= 10L
T1 = initial temperature= 100K
T2 = final temperature= 200K
P2=final pressure=
P1= initial pressure= 80pka
Making P2 subject of the formula from the eqn, we have
P2= (P1*V1*T2=)/(T1*V2)
If we substitute the values we have
P2= (80 × 20×200)/(100×10)
P2= 320pka
Hence, the new pressure is 320pka
Explain why you might feel ill after a vaccine
Answer:
Possibly a bad reaction as some people's immune systems are weaker than others
Explanation:
How many molecules are found in 60 grams of KOH?
Explain step by step please
Answer:
6.624× 10²³ molecules
Explanation:
Given data:
Mass of KOH = 60 g
Number of molecules = ?
Solution:
First of all we will calculate the number of moles.
Number of moles = mass/molar mass
Number of moles = 60 g/ 56.1 g/mol
Number of moles = 1.1 mol
Now number of molecules are determine by using Avogadro number.
1 mole = 6.022 × 10²³ molecules
1.1 mol × 6.022 × 10²³ molecules / 1mol
6.624× 10²³ molecules
Avogadro number:
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
In which highlighted section of the periodic table in the diagram provided above are the elements whose atoms have 1 valence electron located?
A) a
B) b
C) c
D) d
Answer:
B.
Explanation:
WHICH OF THE FOUR COMPOUNDS HAS BONDS WITH THE GREATEST DEGREE OF POLARITY (MOST POLAR)?
Answer:
I NEED TO KNOW THIS TOO
Explanation:
IVE BEEN LOOKING FOR THE ANSWER
what is a relative motion
Answer:
The relative velocity is the velocity of an object or observer B in the rest frame of another object or observer A.
Answer:
Relative motion is defined as the calculation of the motion of an object with regard to some other moving or static object. Thus, the motion is not calculated with reference to the earth, but is the velocity of the object in reference to the other moving object as if it were in a static state.
Explanation:
How do you determine the charge of an ion?
Answer:
Subtract the number of electrons from the number of protons in an atom as a basic way of calculating the charge of the ion.
Explanation:
For example, if a sodium atom loses one electron, work out 11 - 10 = 1.
Fill in the question mark area of the dimensional analysis set up with the correct conversion 3.25 x 10-3 molecules H2O x 1 mole moles PLEASSSS HELPPPP
name two reactions which are endothermic in nature..
Melting ice cubes. Melting solid salts. Evaporating liquid water
Answer:
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The melting point of gallium metal is 29.76⁰C. If a piece of gallium is sliced into three parts, the melting point of each part will be what A: higher than 29.76⁰C. B: 29.76⁰C. C: lower than 29.76⁰C.
Answer:
29.76ºC
Explanation:
The melting point is a physical property of the matter it doesn't change as you slice the gallium into three different parts. Thus, it's the same value 29.76ºC
True/False: We always see the same side of the moon when we look at it in the sky
Answer:
im pretty sure the answer to your question is false sorry if its wrong.
Explanation:
Explain. Why are rift zones common places for
igneous rock to form?
Answer: Rift zones are common places for igneous rock to form because the pulling apart of rocks decreased the pressure on buried rocks.
Explanation: magma can then form and solidify.
which element is unreactive and has a greater atomic radius than 1
Answer:
Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.
Which statement describes a physical property to the particles that make up a material
Answer:
Gold is a relatively dense metal because its atoms have more
protons than atoms of many other metals.
Explanation:
What needs to be known about an object in order to determine its kinetic energy.
P.S Please help I need to answer this question for my pendulum experiment.
Answer:
we need to know it's
mass and velocity
Explanation:
then use the formula of kinetic energy
Answer:
Mass and velocity (or motion).
Explanation:
KE=(1/2)mv^2.
The kinetic energy of an object is the amount of work (expended energy) that's required to move (or more accurately, to accelerate) the object to a specific velocity. So, if you know the mass of the object, and you know it's current velocity, you can determine it's kinetic energy with the formula above.
whats the difference between a bonding electron domain and a nonbonding electron domain?
Answer: lone pair of electrons
Explanation: A bonding electron domain is a pair of electrons shared between two atoms and a nonbonding is a lone pair of electrons
The difference between the bonding electron domain and a nonbonding electron domain should be explained below.
Difference between bonding and non-bonding electron domain:A bonding electron domain refers to the region that lies between the two bonded atoms that comprise one or more pairs where the electrons should be bonded.
While on the other hand, the non-bonded electron contains on the single-atom also comprise of one pair of lone pair.
In this way, it should be differentiated.
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