Answer:
Maybe try a Course Outline or talk to a professional for advice.
Explanation:
calculate the average atomic mass of chlorine if its abundance in nature is 75.77 percent 35cl, an 24.23 percent 37cl
Answer:
Average atomic mass of chlorine =
100
75.77×34.9689+24.23×36.9659
=35.45 g/mol.
Answer:
35.4846.
Explanation:
35 * 0.7577 + 37*0.2423
1
LESSON 3 Controlling
Chemical Reactions
11. In general, what happens when you increase
the temperature of a reaction?
a. The heat destroys the reactants.
b. The rate of the reaction decreases.
C. The rate of the reaction increases.
d. The rate of the reaction stays the same.
Answer:
C.The rate of the reaction increases.
Explanation:
Which body systems are responsible to transport materials around and out of the body?
All that are with it not only one, lol
The circulatory system is the body's transport system. It is made up of a group of organs that transport blood throughout the body. The heart pumps the blood and the arteries and veins transport it.
Calculate the theoretical yield in grams of All3, aluminum iodide, from the complete reaction of
113 grams l2 according to the following balanced chemical equation:
2 Al(s) + 3 I2(s) ---> 2 All3(s)
The theoretical yield of AlI₃ obtained from the reaction is 121 g
We'll begin by calculating the mass of I₂ that reacted and the mass of AlI₃ produced from the balanced equation. This can be obtained as follow:
2Al + 3I₂ —> 2AlI₃Molar mas of I₂ = 2 × 127 = 254 g/mol
Mass of I₂ from the balanced equation = 3 × 254 = 762 g
Molar mass of AlI₃ = 27 + (3 × 127) = 408 g/mol
Mass of AlI₃ from the balanced equation = 2 × 408 = 816 g
SUMMARY
From the balanced equation above,
762 g of I₂ reacted to produce 816 g of AlI₃
With the above information, we can obtain the theoretical yield of AlI₃ by the reaction of 113 g of I₂.From the balanced equation above,
,762 g of I₂ reacted to produce 816 g of AlI₃
Therefore,
113 g of I₂ will react to produce = (113 × 816)/762 = 121 g of AlI₃
Thus, the theoretical yield of AlI₃ is 121 g
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Help with Chemistry questions!!
8. 5 ZnSO4
a. Count the number of Sulfur atom =
b. How many total atoms are given in the compound =
9. Li2SO4
a. Count the number of Sulfur atom =
b. How many total atoms are given in the compound =
10. Al2(SO3)3
a. Count the number of Sulfur atom =
b. How many total atoms are given in the compound =
Answer: To 5 ZnSO4 is I think 1 sulfur atom and 6 total
to Li2SO4 i think it is 1 sulfur atom 7 total
to Al2(SO3)3 I think its 3 sulfur atom 17 total
Explanation: I could be wrong
The number of the sulfur atom in [tex]\rm \bold{ZnSO_4}[/tex] is 1, and the total number of atoms is 6.
In the structure of [tex]\rm \bold{Li_2SO_4}[/tex], the number of sulfur atom is 1, and the total number of atom is 7 atoms.
In the structure [tex]\rm \bold{Al_2(SO_3)_3}[/tex], the number of sulfur atom is 3, and the number of total atoms are 14.
The number of atoms can be calculated by the molecular formula. The subscript to the atom gives the idea about the number of atoms.
[tex]\rm \bold{ZnSO_4}[/tex]:The number of sulfur atom = 1
Total number of atoms = 1 Zn atom + 1 Sulfur atom + 4 Oxygen atom
Total number of atoms = 6 atoms
[tex]\rm \bold{Li_2SO_4}[/tex]:Total number of Sulfur atom = 1
Total number of atoms = 2 Li atoms + 1 Sulfur atom + 4 Oxygen atom
Total number of atoms = 7 atoms
[tex]\rm \bold{Al_2(SO_3)_3}[/tex]:Total number of sulfur atoms = 3
Total number of atoms = 2 Al atoms + 3 sulfur atoms + 9 Oxygen atoms
Total number of atoms = 14 atoms.
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Claire is a middle school student on her way to school one day she saw a puddle in the road when she returns home after school the puddle was gone what happens to the water in the puddle
The water in the puddle had vanished, leaving nothing behind. Water moves from the Earth's surface to the atmosphere via evaporation.
What is evaporation ?A liquid transforms into a gas during evaporation. It is simple to picture when puddles of rain "vanish" on a hot day or when wet clothing dries in the sun.
In these instances, the liquid water is evaporating into a gas known as water vapor rather than really dissipating. Global evaporation takes place.
Heat energy causes the bonds holding the water molecules together to fall apart, which causes evaporation. On the stove, adding heat to liquid water is what you do when you boil water.
Steam is created when water changes from a liquid form to a gaseous state (water vapor) due to the bonding being broken by the additional heat.
Thus, evaporation takes place in this process.
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I'LL GIVE BRAINLIEST TO WHO ANSWERS FULL QUESTION FIRST
Example 3: Dry ice (CO2) sublimes at -78°C. What is this temperature in K?
Answer:
Any solid may be sublimed if its temperature and pressure are below its triple point. For example, if you were to freeze water into ice and cool it further and then reduce the pressure, you could get ice to sublime. Some other examples include: Dry ice (solid CO2) which sublimes at atmospheric pressure and -78 C, and C60 (buckyballs) which sublimes at atmospheric pressure at around 800 K.
Explanation:
Under which of the folowing conditions of temperature and pressure wil H2 gas be expected to behave most like an ideal gas ?
A )50 K and 0.10 atm
B)50kand 5 atm
c)500k and 0.1atm
D)500k and 50atm
Answer:
C ( 500K and 0.1atm)
Explanation:
Which element gains two electrons to fill its outermost energy level?
(1 point)
O fluorine (F)
O magnesium (Mg)
O selenium (Se)
lithium (Li)
Among the given elements the one which gains two electrons to fill outermost energy level is selenium. Selenium contains six electrons in its valence shell.
What is selenium?Selenium is 34th element in periodic table. It is classified into the 16th group. 16th group is oxygen family and the group members are oxygen , sulfur, selenium, tellurium and polonium.
The number of valence electrons of the 16th group elements is 6. Thus according to octet rule they need two more electron to attain stability. They form covalent compounds by sharing their two electrons.
Magnesium loses two electrons to attain octet and fluorine needs oe and lithium loses one electron to be stable. Hence, the element among the given list which gains two electrons to fill its outermost energy level is selenium (Se).
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why can't you find the charge of an atom in the d shell with just a periodic table?
Answer:
We can calculate the number of valence shell electrons by the group number from group number ,for 1 and 2 group,1,2 are valency or charge simply,for groups lying 3–8(boron to helium family)if number is between 3–4 the group number is the charge,if number lies between 5–8 then add -8 to it,it will give a -ve which would imply it's affinity for electron
mark brilliant plsss
1. Athletes eat food that are high in
Answer:
Athletes can increase their stores of glycogen by regularly eating high-carbohydrate foods.
Explanation:
If carbohydrate in the diet is restricted, a person's ability to exercise is compromised because there is not enough glycogen kept in storage to fuel the body.
Answer:
carbohydrates
Explanation:
Athletes can increase their stores of glycogen by regularly eating high-carbohydrate foods. If carbohydrate in the diet is restricted, a person's ability to exercise is compromised because there is not enough glycogen kept in storage to fuel the body.
what is the differences between energy conversion and energy transfer??
help pls
Answer:
Energy transfer is the movement of energy from one location to another.
Explanation:
Energy transfer is the movement of energy from one location to another. Energy transformation is when energy changes from one form to another – like in a hydroelectric dam that transforms the kinetic energy of water into electrical energy.
how many days does it take to thaw a turkey in the fridge
Answer:
Each 24 hours for every 5 pounds of turkey. So a 15-pound bird will take around 3 days to thaw completely.
Explanation:
What is the density of a solid with a mass of 75g and a volume of 5 cm^3?
Answer: 15 g/cm^3
Explanation: formula for density is d= m/v where d is the density, m is the mass and v is the volume. If we plug in the values from the question, we get d= 75/ 5. 75 divided by 5 is 15 so the density is 15 grams per cubic centimetre.
Li = # of atom
O= # of atom
answer:
O= 2 atoms
Li= 3 atoms
Helpp me Guys I Need This Now:)
ok im here to help with your 5th grade homework
what are the four differences between metals and nonmetals
HURRY PLS
Answer:
Non Metal:
Explanation:
for ionic/covalent bonds.
brittle and nonmalleable.
low melting/boiling points.
High ionization energy and electronegativity.
Metal:
Metals are lustrous, malleable, ductile, good conductors of heat and electricity.
A flask holds a mixture of equal moles of oxygen, nitrogen, and argon gases. The total mass of the gas mixture is 149 g. What is the density of this gas mixture at 725 K and 6.13 atm?
The density of this gas mixture at 725 K and 6.13 atm is 21.68g/L.
How do we calculate density?Density of the gas will be calculated by dividing the mass of gas by their volume.
For this first we have to calculate the volume of gas by using the ideal gas equation as:
PV = nRT, where
P = pressure = 6.13 atm
V = volume = to find?
R = universal gas constant = 0.08206 L.atm / mol.K
T = temperature = 725K
n is the moles of gas and it is mention that oxygen, nitrogen and argon have same moles and we let it be x, moles of this would be calculated from 149g as:
3x = 149 / (14+16+40) = 2.12
x = 0.709 moles
On putting all these values on the ideal gas equation, we get the value of V as:
V = (0.709)(0.082)(725) / 6.13 = 6.87 L
Now we consider the value to calculate the density as:
Density = 149 / 6.87 = 21.68g/L
Hence, the required density of mixture is 21.68g/L.
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Can someone please help me with this asap? I’ll mark brainliest.
Answer:
Cup b has more thermal energy because it has a higher measured temperature
Cub b has more thermal energy because it has a higher surface area and volume
Ice cools the temperature of the water as the heat leaves it and causes the ice to melt due to the heat received
The ice takes the heat from the water
Explanation:
Atom is anything that has mass and occupies space. True or false
Answer:
False.
Explanation:
Matter is anything that has mass and occupies space, not atoms.
Question 1 (1 point)
Which object has a net force of zero acting on it?
Question 1 options:
a football flying through the air
a cat running after a mouse
a flowerpot sitting on a table
a speeding car
Question 2 (1 point)
Which object has unbalanced forces acting on it?
Question 2 options:
a sweater sitting on a store shelf
a letter sitting in a mailbox
a fence around a garden
a leaf falling to the ground
Question 3 (1 point)
What happens to the motion of an object when the forces acting on it are balanced?
Question 3 options:
The object changes direction.
The object's motion does NOT change.
The object slows down.
The object speeds up.
Question 4 (1 point)
When unbalanced forces act on an object that is in motion, the object can:
Question 4 options:
change speed, direction, or both.
only slow down.
only change direction.
only speed up.
Question 5 (1 point)
TRUE or FALSE: a balanced forces is one in which the net force is zero.
Question 5 options:
True
False
Please help! Ill give 20 points!!
A force is only balanced when the net force is zero. Note that unbalanced forces causes a body to accelerate.
According to Newton's law, an object will only move when it is acted upon by an unbalanced force. Hence, if the forces acting on an object are balanced, it will not move. A flower pot sitting on a table has a zero net force acting on it.
When a leaf is falling to the ground, it is acted upon by an unbalanced force. Note that unbalanced forces causes a body to accelerate. If a body in motion is acted upon by balanced forces, the objects motion does not change.
The action of unbalanced forces leads to acceleration of a body or change in direction. Hence, when unbalanced forces act on an object that is in motion, the object can change speed, direction, or both. A force is only balanced when the net force is zero.
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Researchers can use solvents to extract, or break apart, components of a cell or tissue to separate and/or isolate components. If you extracted some cells with a non-polar organic solvent, what would the solvent contain the MOST of at the end of the process
The cell membrane which is more fat permeable will be present at the end of the process.
Solvent extraction is a very important method if separating mixtures. The principle of solvent extraction is based on the idea of like dissolves like. A substance dissolves in the component of the system in which it is most soluble.
If a cell extract is dissolved in a nonpolar solvent, the cell membrane which is mostly permeable to nonpolar molecules will dissolve most in the solvent.
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Answer:
A. chlorophyll
Explanation:
Plants use chlorophyll the most & I took the test.
Use the redox reactions to answer the question.
Zn + 2H+ → Zn2+ + H2
2Al + 3Cu2+ → 2Al3+ + 3Cu
Which elements are oxidized? (1 point)
hydrogen (H) and aluminum (Al)
hydrogen (H) and copper (Cu)
zinc (Zn) and aluminum (Al)
zinc (Zn) and copper (Cu)
Answer: zinc(Zn) and aluminum (AI)
Explanation:
I took the test :)
In this redox reaction Zn + 2H+ → Zn2+ + H2, 2Al + 3Cu2+ → 2Al3+ + 3Cu
zinc ( Zn ) and aluminum ( Al ) are oxidized.
What is redox reaction ?Redox reactions include a change in the oxidation state of the substrate. Similar to how reduction is the acquisition of electrons while oxidation is the loss of electrons or an increase in the oxidation state.
The combined processes of oxidation and reduction are known as redox reactions due to their complimentary nature. The oxidizing agent is the reactant that causes the oxidation, while the reducing agent itself reduces this reagent.
An atomic exchange of electrons between atoms causes a chemical reaction known as a redox reaction. The primary distinction between oxidation and reduction is that the former involves an increase in an atom's oxidation status while the latter involves a decrease in its oxidation state.
Thus, option C is correct.
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A gas mixture containing only helium and neon is 31.4 % neon (by volume) and has a total pressure of 758 mmHg. What is the partial pressure of neon
Answer:
1.84mm Hg
Explanation:
Predict the type of bonding in each of the following substances. Provide their chemical
names and predict which ones will conduct electricity.
a. MgCh
b. O2
c. AgOH
d. Pt
14 points for the first answer!!!!
Which of the following elements has the lowest ionization energy?
S because it is a nonmetal that will gain two electrons to obtain an octet.
Ba because it is a large metal atom that will easily lose two valence electrons.
Na because it is a small metal atom and can hold onto its electrons tightly.
Why is the reaction rate for reactants defined as the negative of the change in reactant concentration with respect to time?
Answer:
The reaction rate for reactants is negative because the reactants are being used up as the reaction produces from left to right. the rate of the products is positive because they are being formed.
Explanation:
Hope this helps
what five elements make up 99% of living things
Answer:
oxygen, carbon, hydrogen, nitrogen, and sulfur
Explanation:
5
Carbon and other nonmetals are found in which area of the periodic table?
a. on the left-most side
b.
on the right side
c. in the middle column of the periodic table
d. in the bottom rows
Answer:B
Explanation:
The metals are to the left of the linethe nonmetals are to the right of the line, and the elements immediately adjacent to the line are the metalloids.
can somebody please help me with this question please
Answer:
c because she crating the energy
