Answer:
Chlorine (35.44 amu)
Explanation:
An unknown element is found to have three naturally occurring isotopes with atomic masses of 34.9689 (76.000%), 36.9659 (23.988%) and 35.9683 (0.012%).
We need to find the mass of the unknown element. When abundances is given, then atomic mass is given by :
[tex]M=34.9689 (76.000\%)+36.9659 (23.988\%) +35.9683(0.012\%)\\\\=34.9689 (\dfrac{76}{100})+36.9659 (\dfrac{23.988}{100}) +35.9683(\dfrac{0.012}{100})\\\\=35.44\ \text{amu}[/tex]
So, the atomic mass of the unknown element is 35.44 amu and it is chlorine.
What is platonic plate boundary?
Best answer gets brain-list.
Answer:
Earth’s tectonic plates fit together in a jigsaw puzzle of plate boundaries.
The Earth’s outer shell, the lithosphere, consisting of the crust and uppermost mantle, is divided into a patchwork of large tectonic plates that move slowly relatively to each other. There are 7-8 major plates and many minor plates. Varying between 0 to 100mm per year, the movement of a plate is driven by convection in the underlying hot and viscous mantle.
Explanation:
Predict the density of acetylene gas (C2H2) at 0.910 atm and 20oC.
Answer:
d = 0.98 g/L
Explanation:
Given data:
Density of acetylene = ?
Pressure = 0.910 atm
Temperature = 20°C (20+273 = 293 K)
Solution:
Formula:
PM = dRT
R = general gas constant = 0.0821 atm.L/mol.K
M = molecular mass = 26.04 g/mol
0.910 atm × 26.04 g/mol = d × 0.0821 atm.L/mol.K×293 K
23.7 atm.g/mol = d × 24.1 atm.L/mol
d = 23.7 atm.g/mol / 24.1 atm.L/mol
d = 0.98 g/L
How old are the Appalachian Mountains?
Answer:
480 million years old
Explanation:
What is the amount of heat energy absorbed when 36 grams of ice at -20oC is melted to water at 0oC?
Answer:
Q = 1461.6 J
Explanation:
Given data:
Mass of ice = 36 g
Initial temperature = -20°C
Final temperature = 0°C
Amount of heat absorbed = ?
Solution:
specific heat capacity of ice is 2.03 j/g.°C
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 = T2 - T1
ΔT = 0°C - (-20°C)
ΔT = 20°C
Q = 36 g ×2.03 j/g.°C×20°C
Q = 1461.6 J
which term refers to a property that depends only on the amount of a substance
Answer:
d
Explanation:
A tennis ball is hit into the air with a racket. When is the ball’s kinetic energy the greatest? Ignore air resistance.
A when it leaves the racket
B just before it reaches the ground
C when it reaches its maximum height
D when its kinetic energy and potential energy are equal
E just before it starts falling downward
Answer:
E. just before it reaches the ground.
Explanation:
The "kinetic energy" refers to the energy when an object moves or is in motion. When the ball leaves the racket, it is considered to have a great amount of kinetic energy. However, this decreases as the ball reaches its maximum height, but the potential energy is at its highest. Upon falling down, its kinetic energy increases but its potential energy decreases.
Provided that there's no air resistance, the speed of falling is even faster for the ball because of gravity and nothing is slowing it down, which means it will have a maximum kinetic energy just before it reaches the ground.
In this stoichiometry problem, determine the limiting reactant:
Aqueous copper(II) nitrate reacts with aqueous sodium sulfide to produce aqueous sodium nitrate and copper(II) sulfide as a precipitate. In this reaction 469 grams of copper(II) nitrate were combined with 156 grams of sodium sulfide to produce 272 grams of sodium nitrate. Select all that apply.
The limiting reactant : Na₂S
Further explanationReaction
Cu(NO₃)₂ (aq) + Na₂S (aq) ⇒ 2 NaNO₃ (aq) + CuS (s)
mol Cu(NO₃)₂ :(MW 187,56 g/mol)
[tex]\tt mol=\dfrac{469}{187.56}=2.5[/tex]
mol Na₂S :(MW 78,0452 g/mol)
[tex]\tt mol=\dfrac{156}{78.0452}=2.0[/tex]
Limiting reactant(smaller ratio⇒ between mol and coefficient) :
1 mol Cu(NO₃)₂ : 1 mol Na₂S , so the limiting reactant : Na₂S( 2 < 2.5)
Industrial deep-sea divers must breathe a mixture of helium and oxygen to prevent a disorienting condition known
as nitrogen narcosis. If a diver's tank is filled with a helium-oxygen mixture to a pressure of 170 atmospheres and the
partial pressure of helium is 110 atmospheres, the partial pressure of the oxygen is -
Answer:
60
Explanation:
hope this helps :)
If a diver's tank is filled with a helium-oxygen mixture to a pressure of 170 atm and the partial pressure of helium is 110 atm, the partial pressure of the oxygen is 60 atm.
What is Dalton's theory?Dalton's theory of partial pressure states that total pressure of any mixture of gas is equal to the sum of the partial pressure of each gas present in that.
Given that total pressure of mixture = 170 atm
Partial pressure of helium = 110 atm
Partial pressure of oxygen = 170 - 110 = 60 atm
Hence partial pressure of oxygen gas is 60 atm.
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Can someone please help me fill this out?
What is the density of a rock that has a mass of 555 g and a volume of 101.1 cm?
Answer:
the volume should be in cubic cm so I assumed that you wanted to write the same . then the answer is 5489.07 kg/m^3
Answer:
[tex]\boxed {\boxed {\sf d\approx5.49 \ g/cm^3}}[/tex]
Explanation:
Density can be found by dividing the mass by the volume.
[tex]d=\frac{m}{v}[/tex]
The mass of the rock is 555 grams and the volume is 101.1 cubic centimeters.
[tex]m=555 \ g \\v= 101.1 \ cm^3[/tex]
Substitute the values into the formula.
[tex]d=\frac{555 \ g}{101.1 \ cm^3}[/tex]
Divide.
[tex]d=5.48961424 \ g/cm^3[/tex]
Let's round to the nearest hundredth to make the answer more concise.
The 9 in the thousandth place tells us to round up. In the tenth place, the 8 will become a 9.
[tex]d\approx5.49 \ g/cm^3[/tex]
The density of the rock is about 5.49 grams per cubic centimeter.
What is it called when individual water molecules on the surface of a liquid gain enough motion energy (kinetic energy), they leave the liquid to become a gas.
Answer:that is called Evaporation!
Explanation:
help pls i will give 15 point
Can gravity be considered a force?
you will need an
1. claim,
2. evidence,
3. reasoning
what variables affect gravity?
you will need an,
1. claim
2. evidence.
3.reasoning
please help, thank you
how many atoms are in KCIO3?
5 atoms 1 potassium, 1 chlorine, and 3 oxygens, in total that is five
Answer:
[tex]737.45 \times {10}^{23} [/tex]
hope this will be true...
Calculate the number of molecules in 0.5 moles of Sodium sulfate (Na2SO4)?
Answer: ??? molecules Na2SO4 (no rounding; make sure to include scientific notation when necessary)
Answer: The formula mass for sodium sulfate was calculated on page T-9. Referring to those numbers, the formula Na2SO4 means: two moles sodium (45.98 g), one mole is (32.06 g.
Explanation: Your welcome.
When elements form bonds, it changes their ______ properties.
The answer is..?
Answer:
chemical and physical
When elements form bonds, it changes their chemical and physical properties.
What is element ?A chemical element is a species of atoms, including the pure material made entirely of that species, that have a specific number of protons in their nuclei. Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.
A material that cannot be further decomposed by any chemical reaction is known as a chemical element. Each element's atom has a specific number of protons.
For instance, a carbon atom has six protons compared to the one proton in a hydrogen atom. Ions are created by changing the number of electrons in an element's atom.
Thus, When elements form bonds, it changes their chemical and physical properties.
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Which statement describes magnetic force?
O A. Every magnet has three poles.
O B. All materials are magnetic.
O C. Magnets can only repel each other.
O D. A north pole and a south pole attract each other.
Answer:
D. A north pole and south pole attract each other
Answer:
D
Explanation:
3. (05.04 MC)
What mass of Hy is needed to react with 8.75 g of Oz according to the following equation: 02(g) + H2(g) → H2O(g)? (4 points)
Answer:
1.10 g H2
Explanation:
In a Covalent bond which statement is true
Answer:
correct is A, but it isn't quite right. Only when the electronegativity values of the two atoms are the same will the bond be 100% covalent.
what is the mass number of a carbon isotope with 10 neutrons
Answer:
16 because carbon atom having usual 6 neutron have a mass number of 12 and that with 7 neutron has mass number of 13
What is the name of the compound represented by Ca3P2
A.) calcium Phosphite
B.) Tricalcium diphosphide
C.) Calcium Phosphate
D.) Calcium Phosphide
Answer:
Calcium phosphide (D)
Explanation:
Hope I helped^^
Can i please get brainliest
Is the following equation balanced or unbalanced?
H2 + O2 + H2O
Answer:
its looks unbalanced too me
Explanation:
which outcome resaults when a liquid is heated
Answer:
evaporation
Explanation:
Type the chemical name of the compound that contains 1 copper atom, 1 oxygen
atom, and 1 hydrogen atom.
Answer:
Copper (I) hydroxide
Explanation:
Copper (I) hydroxide is a chemical compound with the chemical formula of CuOH. One copper atom (Cu), one oxygen atom (O), and one hydrogen atom (H.)
Which of the following best describes where cellular respiration occurs?
Answer:
In every body cell
Explanation:
Answer: in every body cell
Explanation:
9. When 4.46 moles of ethylene, C2H4, burns in oxygen to give carbon dioxide and
water, how many grams of carbon dioxide are formed?
C2H4 + 3 O2 → 2 H2O + 2 CO2
How many grams of carbon dioxide are formed??
Answer:
4.46 moles of Ethylene will produce 392.48 grams of Carbon dioxide.
Explanation:
The reaction is as follows
C2H4 + 3 O2 → 2 H2O + 2 CO2
For complete combustion of Ethylene 1 mole of ethylene gives 2 moles of Carbon dioxide.
using unitary method
1 C2H4 => 2CO2
4.46 of C2H4 => 2*4.46 CO2
= 8.92 CO2
No of moles = given mass(w) /molar mass(M)
Molar mass of CO2 = 44g
8.92 = W / 44
W = 8.92 * 44
= 392.48g
So 4.46 moles of Ethylene will produce 392.48 grams of Carbon dioxide.
4.46 moles of ethylene burns in oxygen to give 393 g of carbon dioxide and water.
What is combustion?Combustion, or burning, is a high-temperature exothermic redox chemical reaction between a fuel and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.
Let's consider the reaction for the combustion of ethylene.
C₂H₄ + 3 O₂ → 2 H₂O + 2 CO₂
We can calculate the mass of CO₂ formed by the combustion of 4.46 moles of C₂H₄, considering the following relationships.
The molar ratio of C₂H₄ to CO₂ is 1:2.The molar mass of CO₂ is 44.01 g/mol.4.46 mol C₂H₄ × (2 mol CO₂/1 mol C₂H₄) × (44.01 g CO₂/1 mol CO₂) = 393 g CO₂
4.46 moles of ethylene burns in oxygen to give 393 g of carbon dioxide and water.
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All weather is energy in motion. Where does the energy come from
Answer:
The Sun radiates huge amounts of energy. Only a small portion of that energy hits the Earth, but it is enough to light our days, heat our air and land, and create weather systems over the oceans. Most of the energy you will learn about comes from the Sun. The Earth also gives off energy.
Explanation:
Answer:
"The Sun radiates huge amounts of energy. Only a small portion of that energy hits the Earth, but it is enough to light our days, heat our air and land, and create weather systems over the oceans. Most of the energy you will learn about comes from the Sun. The Earth also gives off energy."
By the way I got this off thee internet and copy and pasted it so don't write it just look and write in your own words please. Please do not copy and paste or write what i wrote because this is someone else's explanation or answer
Hope this helps!! Also please rank thank you.
Explanation:
Group 18 noble gases are relatively inert because *
their s and p orbitals are filled (outer energy level is filled).
they can have either a positive or a negative charge.
their outermost energy level is missing one electron.
they readily form positive ions.
Answer:I believe its A. There noble gasses so there happy with there electron count!
Explanation:
Group 18 noble gases are relatively inert because their s and p orbitals are filled, meaning their outer energy level is filled. Therefore option 1 is correct.
The noble gases, which include elements like helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn), belong to Group 18 (VIII A) of the periodic table.
These elements have a full complement of electrons in their outermost energy level, also known as the valence shell. This outermost energy level is comprised of s and p orbitals.
Having a filled outer energy level makes noble gases highly stable and unreactive. The stability arises from the fact that their electron configurations are complete, meaning they have achieved a configuration similar to the noble gas that precedes them in the periodic table.
Because noble gases have no missing or unpaired electrons in their outer energy levels, they have little tendency to gain, lose, or share electrons with other atoms.
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Which of these is NOT a cation?
A) K+
B) Mg2+
C) NH4+
D) Cl-
Answer:D) Cl-
Explanation:
Only cations are positive (+)
Cations are positively charged ions. Negatively charged ions are called anions. Among the given ions, Cl- is not a cation. It is an anion.
What are ions ?Ions are charged atoms formed by loss or gain of electron by atoms. Atoms with extra electrons or electron deficient will loss or gain electrons in order to achieve octet.
When atoms loss electrons, the number of their protons become dominant and they acquire positive charge. When atoms gain electrons the number of electrons become dominant and atoms become negative charged.
The positive charged ions are called cations and negative charged ions are called anions. For example when potassium K loss one electron, it forms K+ ion. Similarly when Cl gain an electron it forms the anion Cl-.
Therefore, the one which is not cation among the given ions is Cl-.
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1. Which of the following lists is correctly arranged in order of increasing size?
A. electron, neutron, nucleus, atom
B. electron, nucleus, neutron, atom
C.atom, electron, neutron, nucleus
D. neutron, electron, nucleus, atom
Answer:
C
Explanation:
The order of increasing size are electron, neutron, nucleus and atom.
The size of electron is the smallest among the given particles which followed by neutron that is bigger in size from electron but smaller than nucleus. Proton and neutron are located in the nucleus of an atom so it is bigger in size than neutron.
Atom is the largest among the given substances in which nucleus is present at the center and electrons are revolving around the nucleus in fixed orbits so we can conclude that electron is the smallest and atom is the largest particle.
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