For the following elements, calculate the average atomic mass. Carbon-12
98.93%, Carbon-13 1.07% *
Answer:
Average atomic mass of carbon = 12.01 amu
Explanation:
Given data:
Average atomic mass = ?
Percent abundance of C-12 = 98.93%
Percent abundance of C-13 = 1.07%
Solution:
Average atomic mass of carbon = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass of carbon = (98.93×12)+(1.07×13) /100
Average atomic mass of carbon= 1187.16 + 13.91 / 100
Average atomic mass of carbon = 1201.07/ 100
Average atomic mass of carbon = 12.01 amu
what is the speed and appearance of most cold fronts
Answer:
25mph
Explanation:
cold fronts generally Advance at an average speed of 20 to 25 miles per hour. Towards the east faster in the winter than summer and are usually oriented along the northeast to Southwest line
compare and contrast a Covalent and an ionic bond
Donna is trying to make an electromagnet to pick up old nails around her driveway. Which of these materials would be best to use for the core in order to make the strongest electromagnet to pick up the most nails?
Answer:
iron nail
Explanation:
Use context clues to determine whether the bolded word in each sentence has a positive or negative connotation.
It’s fun to hang out with Serena
because she’s always
laid-back and relaxed.
Seth is so chatty that he won’t
even listen to what anyone
else has to say.
Michaela is so modest, she
never brags about her
accomplishments.
My brother is stingy because
he refuses to share anything
with me.
Desmond’s witty stories made us
laugh all night long.
Answer:
Answer:
1. Positive
2. Negative
3. Positive
4. Negative
5 positive
Explanation: I did this test before
The words have a positive, negative, positive, negative, positive connotation respectively in each of the given sentence.
What is connotation?
Connotation is defined as a property of a particular word or name which describes the ideas or qualities of the word.It is rather being named explicitly or described.
It is frequently described as a positive or negative connotation which is in connection with its pleasing or displeasing connection. Connotation can have words with literal meaning with what they specifically denote.
There are two types of connotations positive connotation and negative connotation wherein positive connotation has positive impact while negative connotation has negative impact.It describes the primary word and it is not necessary that it be present in the sentence or phrase.
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What are some chemical changes in oxygen?
the oxidation reaction between oxygen and sodium produces sodium oxide. In many cases, an element may form more than one oxide.
Explanation:
10.0 gram sample of H20(l) at 23.0°C absorbs. 209 joules of heat. What is the final temperature of H20(l) sample?
what does energy of motion refer to
Answer:
Motion energy – also known as mechanical energy – is the energy stored in moving objects. As the object moves faster, more energy is stored. Motion energy is the sum of potential and kinetic energy in an object that is used to do work.
Explanation:
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Thanks!
How is the process of using patterns to predict phases of the moon similar to the process Mendeleev used to predict undiscovered elements?
The characteristic of some repeating property can be used to find the answer is
The periodic table and the moon phases can be ordered according to some repeating property, you can create an ordered table and leave the gaps for the unknown properties.
The periodic table created by Mendeleev was initially based on the atomic weight of the elements, but he realized that the similarities of the atoms were greater if he used the atomic number, so he changed the ordering.
Mendeleev found that elements with the same number of electrons in their last shell had similar properties, when he ordered them he found that there were holes in the table, shortly after the work of many researchers the holes were completed and found numerous new chemical elements.
In the observation of the phases of the Moon around the earth it is found that for short measurements there are four phases, for longer measurements in addition to these four phases there are several higher repetition periods, with repeated observation the phases and periods are found. .
We can see that the two jobs are searched for, which is repeated and a table is created, leaving the spaces that are not known empty, with subsequent jobs filling these holes.
In conclusion, with the characteristics of some repeating property, the answer can be found is
The periodic table and the phases of the moon can be ordered according to some repeating property, you can create an ordered table and leave the gaps for the unknown properties.
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Which phrase describes the relative age of a rock?
A uses the law of superposition to determine which rock is older or younger
B can determine the age based on location of a rock within the same layer
C requires only one rock to determine the age
D can provide the exact age of a rock
Answer:
i think it MIGHT be D
Explanation:
Answer:
b
Explanation:
edge :)
what are units of molarity
Answer:The units of molarity are M or mol/L. A 1 M solution is said to be “one molar.”
Explanation:
Answer:
mol/L
Explanation:
HURRY FOR A TEST! The ionization energies for removing successive electrons from sodium are 496 kJ/mol, 4562 kJ/mol,
6912 kJ/mol, and 9544 kJ/mol. The great jump in ionization energy after the first electron is removed
indicates that
Select one:
a. sodium has four or five electrons.
b. the atomic radius has increased.
c. a d-electron has been removed.
d. the noble gas configuration has been reached.
Answer:
D. The noble gas configuration has been reached.
Explanation:
In a laboratory, bunsen burner is used to increase the temperature of lime from 10 °C to 50 °C with the thermal energy of 80000 J. If the mass of the lime is 20 kg the specific heat capacity of the lime would be a 50 J/g C b 100 J/g C c 75 J/g C d 25 J/g C
Answer:
c = 100 J/g.°C
Explanation:
Given data:
Mass of lime = 20 g
Heat absorbed = 80,000 J
Initial temperature = 10°C
Final temperature = 50°C
Specific heat capacity of lime = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 50°C - 10°C
ΔT = 40°C
80,000 J = 20 g×c×40°C
80,000 J = 800°C×c
c = 80,000 J /800g.°C
c = 100 J/g.°C
The specific heat capacity of the lime would be is c = 100 J/g.°C
The calculation is as follows:The following formula should be used:
Q = m.c. ΔT
here
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
Now
ΔT = 50°C - 10°C
= 40°C
So,
80,000 J = 20 g×c×40°C
80,000 J = 800°C×c
c = 100 J/g.°C
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Please help me I am confused
on platoo
Eric throws a basketball straight up into the air. As it rises, which form of energy is increasing?
A.
elastic potential energy
B.
electrical energy
C.
gravitational potential energy
D.
kinetic energy
Answer:
c.
Explanation:
Gravitational potential energy will rises
Will give brainliest!!!
How is coal formed?
Answer:
Coal is formed when dead plant matter submerged in swamp environments is subjected to the geological forces of heat and pressure over hundreds of millions of years. Over time, the plant matter transforms from moist, low-carbon peat, to coal, an energy- and carbon-dense black or brownish-black sedimentary rock.
If you have 1.26 x 10^24 molecules, how many moles do you have?
Answer:
E
Explanation:
Just e
which wind belt do we live in
Answer:
the wind belt one
Explanation:
mhm
Answer:The USA lives in the Westerly Windbelt
Explanation:
Which shows a correct association between a structure and one of its functions?
A.) Pores receive sensory information.
B.) Oil regulates temperature.
C.) Vitamin D protects against bacteria.
D.) Sweat glands remove waste.
Answer:
D
Explanation:
Sweat glands remove waste
The correct association that lies between the structure and one of its functions is option D Sweat glands remove waste.
What is a sweat gland that eliminates waste?The sweat represents the fluid that comprises of mainly of water also there is much dissolved solid wastage that should be excreted via the sweat glands. It eliminates the excess water and salts also it served the function of colling the body at the time of thermoregulation.
Therefore, the option D is correct.
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Hi guys! Quick question... sweet or savory??
Answer: savory
Explanation:
SWEET is better in my opinion.
I need help ASAP... look at the picture:)
Answer:
its definitely A
Explanation:
hope this helps
The fluorine ion, F, has one more electron than a neutral fluorine atom.
a) How many pea-halves do you need?
b) Fill the sublevels in the correct order for the fluorine ion and write the electron configuration for the charged atom.
Answer:
a) three pea halves
b) Electron configuration of the fluorine ion 1s2 2s2 2p6
Explanation:
The fluorine atom has seven electrons in its outermost shell and a total of nine electrons occupying three shells.
In the fluoride ion, the fluorine atom accepts one more electron to complete its outermost shell configuration (to have a filled shell as shown).
Hence the fluoride ion has 10 electrons with an electronic configuration of 1s2 2s2 2p6.
What is the wavelength of gamma ray electromagnetic radiation with a frequency of 2.73x10^20 Hz?
Answer:
1.10 × 10⁻¹² m
General Formulas and Concepts:
Chemistry - Atomic Structure
Speed of Light = Wavelength times Frequency
c = λν c = 3.0 × 10⁸ m/sExplanation:
Step 1: Define
ν = 2.73 × 10²⁰ Hz
Step 2: Find wavelength
3.0 × 10⁸ m/s = λ(2.73 × 10²⁰ Hz)
λ = 1.0989 × 10⁻¹² m
Step 3: Check
We are given 3 sig figs. Follow sig fig rules.
1.0989 × 10⁻¹² m ≈ 1.10 × 10⁻¹² m
Which law is described by saying that when the pressure of a gas in a sealed container is cut in half, the gas will double in volume at a steady temperature? Boyle’s law Charles’s law Dalton’s law Gay-Lussac’s law
the answer is boyle's law
Answer:
A.Boyle's Law
Explanation:
Other guy is right Edg. 2020
I need help plz Its a simple middle school question on science about energy PLZZZ I need help
Answer:
I believe C
Explanation:
The absence of air between the two forms a vacuum seal which preserves the contents inside. I think that's right... good luck :)
Which one of these have the biggest ionization energy and why? O, N, F
Answer: Fluorine has the highest ionization enthalpy.
Explanation: This is because the ionization energy decreases from top to bottom and increases from left to right. Also, ionization enthalpy is the amount of energy required by an isolated gaseous atom to lose an electron in its ground state.
Since fluorine needs just one atom to attain noble gas configuration so it will not want to lose any electron and hence a high amount of energy will be required to remove an electron from it.
In an avalanche, a large amount of snow slides down a hill. What energy
conversion takes place during an avalanche?
Gravitational potential energy to kinetic energy. Hence, option A is correct.
What is kinetic energy?
Kinetic energy is a form of energy that an object or a particle has by reason of its motion
If an avalanche occurs, the snow on the mountain accelerates downslope, converting more gravitational potential energy to kinetic energy.
Hence, option A is correct.
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1)26.4 % Carbon
3.3 % Hydrogen
70.3 % Oxygen
Molar Mass: 91.0 g/mol
Empirical Formula:
Molecular Formula:
Answer:
1. Empirical formula => CH2O2
2. Molecular formula => C2H4O4
Explanation:
From the question given above, the following data were obtained:
Carbon (C) = 26.4 %
Hydrogen (H) = 3.3 %
Oxygen (O) = 70.3 %
Molar mass of compound = 91.0 g/mol
Empirical formula =..?
Molecular formula =..?
1. Determination of the empirical formula of the compound.
C = 26.4 %
H = 3.3 %
O = 70.3 %
Divide by their molar mass
C = 26.4 /12 = 2.2
H = 3.3 /1 = 3.3
O = 70.3 /16 = 4.39
Divide by the smallest
C = 2.2 /2.2 = 1
H = 3.3 /2.2 = 2
O = 4.39 /2.2 = 2
Empirical formula => CH2O2
2. Determination of the molecular formula of the compound.
Molar mass of compound = 91.0 g/mol
Empirical formula => CH2O2
Molecular formula => [CH2O2]n
We shall determine the value of n as follow:
[CH2O2]n = 91
[12 + (2×1) + (2×16)]n = 91
[12 + 2 + 32]n = 91
46n = 91
Divide both side by 46
n = 91/46
n = 2
Molecular formula => [CH2O2]n
Molecular formula => C2H4O4
In the given case where 26.4 % Carbon , 3.3 % Hydrogen , 70.3 % Oxygen , and Molar Mass: 91.0 g/mol the:
Empirical Formula: [tex]C_2H_3O_4[/tex] Molecular Formula: ([tex]C_2H_3O_4[/tex])[tex]_1[/tex]Given:
Carbon (C) = 26.4 %
Hydrogen (H) = 3.3 %
Oxygen (O) = 70.3 %
Molar mass of compound = 91.0 g/mol
Determination of the empirical formula of the compound:-
Divide by their molar mass for obtaining moles: C = 26.4 /12 = 2.2 H = 3.3 /1 = 3.3 O = 70.3 /16 = 4.39 for ratio Divide by the smallest: C = 2.2 /2.2 = 1 H = 3.3 /2.2 = 1.5 O = 4.39 /2.2 = 2
The ratio is CHO = 1 : 1.5 : 2
multiply with 2 to find correct and complete number ratio
C = 1 × 2 = 2
H = 1.5 × 2 = 3
O = 2 × 2 = 4
Thus, the Empirical formula => [tex]C_2H_3O_4[/tex]
Mass × n = molar mass
12 × 2 + 1 × 3 + 16 × 4 = 91
24 + 3 + 64 = 91
91 = 91
Thus moles are 1 which means
molecular formula = ([tex]C_2H_3O_4[/tex])[tex]_1[/tex]
Thus, here in the given data:
Empirical Formula: [tex]C_2H_3O_4[/tex]Molecular Formula: ([tex]C_2H_3O_4[/tex])[tex]_1[/tex]
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Situation- I took time away from preparing for my Quiz competition to help two of my neighbourhood friends for their class exam. However, when I needed some help with my Science survey, none of them volunteered. I felt hurt and disappointed.
Response
a)No.3
b)No.5
c)No.1
d)No.4
Explanation:
canot understand the question
uh here’s the 20 characters
Mass of the product : 6.039 g
Further explanationThe reaction equation is the chemical formula of reagents and product substances
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products
Reaction
Ba(s)+Cl₂(g)⇒BaCl₂(s)
mol Ba(MW=137,327 g/mol) :
[tex]\tt \dfrac{4}{137.327}=0.029[/tex]
Mass of BaCl₂ :(MW=208,23 g/mol)
[tex]\tt 0.029\times 208.23=6.039~g[/tex]