Answer:
There are a total of 56 ethnic groups in China, with 56 ethnic groups and 56 family members.
Explanation:
There are a total of 56 ethnic groups in China, with 56 ethnic groups and 56 family members.
An element with three valence electrons would most likely be a
A. Metal
B. noble gas
C. non metal
D. metalloid
If an element has three valence electrons, it is most likely a metal.
In the periodic table, metals are found towards the left hand side of the table. Metals have fewer valence electrons than nonmetals. In the periodic table, there are more metallic than nonmetallic elements.
Metals of group 13 typically have three valence electrons. Hence, if an element has three valence electrons, it is most likely a metal of group 13.
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What quantity is needed to convert between the moles of a
given sample of a substance and its mass in grams?
a the molar mass of the substance
b the density of the substance
C the physical state of the substance
ht?
d all of the above
Answer:
d
Explanation:
thanks so much to you welcomeeee for me and my brother in the same situation and he does it for a year of life in your relationship
15.3 Determine the mass of the following: 15.3.1. 2 mol calcium atoms
15.3.2. 0,3 mol nitrogen molecules
15.3.3. 0,5 mol table salt
15.3.4. 0,2 mol hydrochloric acid
15.3.5. 0,08 mol sodium carbonate (Na2CO3)
15.3.6. 0,25 mol ammonium sulphate (NH4)2SO4
Answer:
hh
Explanation:
Electrons move around the nucleus of atoms in specific shells, shown by the rings around the atoms in the Gizmo. The first ring holds two electrons, and the second holds eight. Observe the sodium and chlorine atoms. How many electrons are there total in each atom?
Answer:
2 electrons is the correct answer hope u pass !!!!!!
Given R = 0.0821L⋅atm/mol⋅k, what is the volume of mole of gas at a pressure of 3.12 atm and a temperature of 270K?
A. 69.2 L/mol
B. 86.5 L/mol
C. 22.2 L/mol
D. 7.10 L/mol
Answer:
The answer is d
Explanation:
Answer:
The answer is D
Explanation:
Calculate the number of grams of Carbon in Co2?
Answer:
Please click above answer.
Explain how changing the amount of greenhouse gases in the atmosphere affects the flow of heat out of Earth's atmosphere.
Explanation:
The added greenhouse gases absorb the heat. They then radiate this heat. Some of the heat will head away from the Earth, some of it will be absorbed by another greenhouse gas molecule, and some of it will wind up back at the planet's surface again. With more greenhouse gases, heat will stick around, warming the planet.
Select the coefficients necessary to balance each equation. Choose a coefficient for every compound.
Photo included
Need help, please teach me how to solve it!
Answer:
See below
Explanation:
2C2H6 + 7O2 = 4CO2 + 6H2O
2C2H2 + 5O2 = 4CO2 + 2H2O
A lot of this is trial and error. I start from left to right. For the first reaction, you had
C2H6 + O2 = CO2 + H2O
You have 2 carbons on the left so you can try adding a 2 in front of the carbons on the right and keep going from there. Now you have
C2H6 + O2 = 2CO2 + H2O
You now have 2 C on each side. C2 is the same as 2C.
The next step is to look at the hydrogens on the left. You have 6 so you need 6 on the right. You can add a 3 in front of the H on the right. The H already has a subscript of a 2 so having the 3 in front will now make it 6H. You now have this
C2H6 + O2 = 2CO2 + 3H2O
So your C are equal (2 on each side) and your H is equal (6 on each side). All that is left is the O. So far you have 2 on the left but you have 7 on the right (4 from the 2CO2 and 3 more from 3H2O). Since you have an even number on one side and an odd number on the other, there is no way to make this work. So it's time to start over.
My next step was to put a 2 in front of C2H6 and keep going as we did above. Start with this
2C2H6 + O2 = CO2 + H2O
You have 4 C on the left. So you need to add a 4 in front of CO2 to get 4 C on the right. Now you have this
2C2H6 + O2 = 4CO2 + H2O
Now on the left you have 12 H (2 in front times the 6 subscript on the H). You need to have 12 on the right. We can get that by putting a 6 in front of the H2O ( again the 6 in front times the 2 subscript of the H is 12 total). You have this now
2C2H6 + O2 = 4CO2 + 6H2O
You now have 4 C on both sides, 12 H on both sides. All that is left now is the O.
On the right side, you have a total of 14 ( 8 from the 4CO2 and 6 from 6H2O). So you'd need to add 7 in front of the O2 to make it 14.
You're done. 4 C on both sides, 12 H on both sides and 14 O on both sides.
The second equation I just did the same process.
Calculate the mass of 3.4 x10^16 atoms of aluminum
Answer:
1.5232 × 10^-6 grams
Explanation:
Using what you know about models, write an explanation from the following prompt
HOPE IT HELPS YOU
CAN YOU BRAINLEST ME
6. Which of the following statements is/are TRUE of metals and non-metals?
l. Non-metals are heat conductors.
ll.Aluminum, copper and iron are non-metals.
III. Phosphorus and sulfur are poor conductors of heat and electricity
IV. Metals have luster.
A. I only
B. III only
C. III and IV
D. I and II
Answer:
I= true
III=false
iv=true
List the three pieces of evidence for sea floor spreading that also support the theory of continental drift
1. Same fossils have been found on different continents
2. Their coastlines fit together
3. Mountain ridges, land formations, glacial evidence, rocks…
Btw, can you describe the rotation of North America? I’m having trouble with continental drift too-
Hello there
i am looking for some quick help on this question thank you.
Liquid B has a mass of 75 g and a volume of 25 ml. What is liquid B's density?
1: .33 g/ml
2: 3 g/ml
3: 75 g
4: 25 ml
Answer:
To measure the density of a liquid you do the same thing you would for a solid. Mass the fluid, find its volume, and divide mass by volume. To mass the fluid, weigh it in a container, pour it out, weigh the empty container, and subtract the mass of the empty container from the full container.
Explanation:
Answer:
[tex] \rho = \frac{mass}{vol} \\ = \frac{75 \: g}{25 \: ml} = 3g .{ml}^{ - 1} [/tex]
Tom tells Greta that his father, an astronomer, is planning a scientific experiment to study another galaxy. Using a powerful telescope, Tom's father will record data of shifts in light patterns and track their different sources every 30 seconds. He will later study the data. Greta says that this is not an experiment. Which of these reasons supports Greta's statement?
It is not performed in a lab.
There are too many variables.
It does not have a control group.
It uses only theoretical predictions.
Answer:
it does not have a control group
Consider a hypothetical gas which has the following Van der Waals constants:
a = 2.34 L2 bar mol-2
b = 0.0 L mol-1
Under conditions of very high pressures, what would you predict about the experimental volume of the gas?
The volume would be lower than predicted by the Ideal Gas Law
The volume would be higher than predicted by the Ideal Gas Law
The volume would be exactly the same as predicted by the Ideal Gas Law
Under conditions of very high pressures, the volume would be lower than predicted by the Ideal Gas Law.
According to the kinetic theory of gases, a gas spreads out to fill the volume of the container holding it. Hence a gas does not have a definite volume due to the fact that there is no inter-molecular interaction between gas molecules.
When the gas is subjected to very high pressure, inter-molecular interactions become significant leading to a decrease in the volume of the gas.
Therefore, when subjected to high pressure, the experimental volume would be lower than predicted by the Ideal Gas Law.
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1. What is the energy of a microwave photon that has a frequency of 1.07 * 10 ^ 12 * H * z; (h = 6.63 * 10 ^ - 34 * J * s)
Answer:
7.96 x 10^-22 J
Explanation:
Which equation best represents the conservation of matter?
A 200.0 ml beaker filled with oil has a mass of 293.2 g. The mass of just the beaker is 130.2
g. What is the density of the oil?
Answer in a complete sentence. Show your work. Your final answer should have the cor-
rect number of sig figs. show work!
Answer:p=m/v
p=(292.2-130.2)/200
p=0.8100g/ml
Explanation:
Density of a substance is the ratio of its mass to volume. The density of the oil filled in a 200.01 ml beaker is 0.815 g/ml.
What is density?Density of a substance is the mass per volume. Thus we het how much of its particles are located per one unit of volume.
Mathematically density can be written as mass/ volume. The mass of the beaker containing oil is given as 293.2 g. The mass of beaker itself is 130.2 g. Hence, mass of oil is 293.2 - 130.2 = 163 g.
Volume of the oil is 200 ml. Thus density is 163 g/200 ml = 0.815 g/ml.
Hence, the oil in the beaker with 200 ml volume and 163 g mass have a density of 0.815 g/ml.
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Formic acid, from the Latin formica, is the acid present in ants sting. What is the
concentration of HCOO" at equilibrium if the initial concentration of formic acid,
HCOOH, is 1.35 M (Kg = 1.7 x 10-4).
For the reaction of deprotonation of formic acid, the concentration of HCOO⁻ at equilibrium is 0.0151 M if the initial concentration of formic acid is 1.35 M.
The reaction of deprotonation of formic acid is the following:
CHOOH + H₂O ⇄ HCOO⁻ + H₃O⁺
At the equilibrium we have:
CHOOH + H₂O ⇄ HCOO⁻ + H₃O⁺ (1)
1.35 - x x x
The acid equilibrium constant for this reaction is:
[tex] K_{a} = \frac{[HCOO^{-}][H_{3}O^{+}]}{[CHOOH]} = 1.7 \cdot 10^{-4} [/tex] (2)
Entering the values of [CHOOH] = 1.35-x, [HCOO⁻] = [H₃O⁺] = x, into equation (2) we have:
[tex] 1.7 \cdot 10^{-4} = \frac{[HCOO^{-}][H_{3}O^{+}]}{[CHOOH]} = \frac{x^{2}}{(1.35 - x)} [/tex]
[tex]1.7 \cdot 10^{-4}(1.35 - x) - x^{2} = 0[/tex]
After solving the above quadratic equation and taking the positive value for x (concentrations cannot be negative), we have:
[tex] x = [HCOO^{-}] = [H_{3}O^{+}] = 0.0151 M [/tex]
Therefore, the concentration of HCOO⁻ at equilibrium is 0.0151 M.
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Science science science science
Answer:
science?? i guess
:\
Explanation:
Answer:
The 5000 kilogram truck
Explanation:
The 5000 kilogram truck is using less force to move vs the 10000 kilogram truck because 5000 kilogram truck is lighter and so needs half the speed as the 10000 kilogram truck.
Find out how filtration is used in the human body ?
Answer:
Filtration is the removal or filtering of the toxins and waste products from the blood by the kidney. They are excreted from the body through urine. In general, filtration refers to the passing of a liquid through a filter. In the human body, the kidney functions as a filter.
Explanation:
For each of the three ionic compounds, select which main group X belongs to.
X₂PO4
Answer:group 1A(1)
Explanation:
A 95,000g refrigerator is located on the 70th floor of a skyscraper (300 meters above the ground) What is the
potential energy of the refrigerator?
Answer:
285 kJ
Explanation:
potential energy
= m g h
= 95,000 g × 10 m/s² × 300 meters
= 95 kg × 10 m/s² × 300 meters
= 950 kgm/s² × 300 meters
= 285,000 J
= 285 kJ
The theory of spontaneous generation states that *
A. Even though higher level organisms cannot be created from inanimate objects, it is possible for microorganisms
B. Living organism can be created from nonliving matter
C. Life is created by other living things
D. Only living humans can create other living creatures
Answer:
B. Living organism can be created from nonliving matter
Explanation:
The theory of spontaneous generation states that life could come from non-living things.
Which of the following sets of quantum numbers is not allowed?
A.) n=3, l=2, ml=-2
B.) n=4, l=3, ml=-3
C.) n=2, l=1, ml=-1
D.) n=2.5, l=0, ml=0
E.) n=3, l=2, ml=-1
Answer:
D) n = 2.5, ℓ = 0, mℓ = 0
Explanation:
According to the rules governing acceptable quantum numbers, the value for n must be an integer. Therefore, the set {n = 2.5, ℓ = 0, mℓ = 0} is not allowed.
Which of the following is not a derived unit?
A) g/ml
B) liter
C) kg
D) All of these are derived.
We mix 88 grams of oxygen gas with 33 grams
of argon gas in a volume of 2400 mL at 62◦C.
What will be the final pressure of the gas
mixture?
The final pressure of the gas mixtures is 72.48 atm.
The given parameters;
mass of the oxygen = 88 gramsmass of the argon, = 33 gramsvolume of the gaseous mixture, V = 2400 mL = 2.4 LThe number of moles of the gases is calculated as follows;
[tex]number \ of \ moles \ of \ oxygen = \frac{88}{16} = 5.5 \ moles\\[/tex]
[tex]number \ of \ moles \ of \ argon = \frac{33}{40} = 0.825 \ moles\\[/tex]
The total number of moles of the gas mixture;
= 5.5 + 0.825
= 6.325 moles
The final pressure of the mixture is calculated as follows;
PV = nRT
[tex]P = \frac{nRT}{V} \\\\P = \frac{6.325\ mol \times (0.0821 \ L.atm/mo.K) \times (62+273)}{2.4 \ L} \\\\P = 72.48 \ atm[/tex]
Thus, the final pressure of the gas mixtures is 72.48 atm.
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I WILL MARK YOU BRAINLIST PLEASE HELP
Answer: See below
Explanation: a. The mass of an element is composed of:
protons: 1 amu each
neutrons: 1 amu each
electrons: 0 amu each
Only the protons and neutrons are counted in the atomic mass of an element
b. Electrons are assigned a mass of 0. They do have a mass, but it is exceedingly small compared to the protons and neutrons, so they are left out of the calculation of an element's mass.
c. An element becomes unstable if the neutrons exceed the protons by a certain ratio, dependent on the element.
12) SEP Use Mathematics Complete the table by identifying the atomic number and
mass number for each atom and then using those data to determine the numbers
of protons, neutrons, and electrons.
Composition of Atoms
Atom
Atomic number
Mass number
Protons
Electrons
Neutrons
Na
2s
silver-108
47
T
gold-197
79
O
+ Back
Next →
INTL
The given elements are Na, Ag and Au.
1. Sodium(Na)
Mass number= 23 u
Atomic number=11
Number of protons= Number of electrons= Atomic number=11
Number of neutrons= Mass number- Number of protons=23-11=12
2. Silver (Ag)
Mass number= 108 u
Atomic number= 47
Number of protons= Number of electrons= Atomic number= 47
Number of neutrons= Mass number- Number of protons=108-47=61
3. Gold (Au)
Mass number= 197 u
Atomic number= 79
Number of protons= Number of electrons= Atomic number= 79
Number of neutrons= Mass number- Number of protons= 197-79=118
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