Answer:
Notice that the value 12.01 grams of natural carbon is the same as the atomic mass value (12.01 amu). It also tells us that 20.34 grams of aluminum contains exactly 6.022 x 1023 atoms of aluminum.
Explanation:
Mole measure the number of elementary entities of a given substance that are present in a given sample. There are 4.16gram of aluminum in9.67 x 10²²atoms of aluminum.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. Mole is inversely proportional to avogadro number.
Given number of atoms= 9.67 x 10²²atoms
we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number
mole =given number of atoms ÷ 6.022×10²³(Avogadro number)
Substituting the values
mole=9.67 x 10²²÷ 6.022×10²³
mole = 0.16moleof Aluminum
mass of aluminum= 0.16moleof sodium×26g/mol
mass of aluminum =4.16gram
Therefore, there are 4.16gram of aluminum in 9.67 x 10²²atoms of aluminum.
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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.
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:
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:
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.
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.
in a circuit, the switch
A) opens and closes the circuit
B) starts and stops the electrons
Helpp me Guys I Need This Now:)
ok im here to help with your 5th grade homework
Bismuth-210 has a half life of 5.0 days if you had a sample of 60.00g of Bismuth-210 how much would be left after 15 days? (Show Your Work)
Answer:
7.5 gm left
Explanation:
Bismuth-210 has a half life of 5 days
15 days is 15/5 = 3 half lives
since half the amount is left in 5 days or 1 half life
(1/2) x (1/2) x (1/2) the staring amount would be left in
3 half lives. so 1/8 is left
(1/8) x 60.0 = 7.5 gm left
when hydrogen is fused into helium, energy is released from
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:
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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How can you increase the boiling point of water?
A. By increasing the volume of the water
B. By increasing the air pressure above the water
C. By lowering the air temperature above the water
ОО
D. By lowering the pressure of the water
Answer: B
Explanation:
You can increase the pressure above the boiling water.
The boiling point of a liquid varies depending upon the surrounding environmental pressure. A liquid in a partial vacuum has a lower boiling point than when that liquid is at atmospheric pressure. A liquid at high pressure has a higher boiling point than when that liquid is at atmospheric pressure.
what reagent is used to detect the presence of starch?
Answer:iodine solution
Explanation: it is because in the presece of starch iodine will turn blue/black
the element to atomic 35 belong to_____ A, s-block B,P-block c, d-block D,f-block
Answer:
B
Explanation:
p block bc its last orbit is 4p5
Answer:
Explanation:
P. block
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.
How many moles are 60.22*10^23 atoms of sodium?
Moles = Number of Atoms ÷ Avogadro's Number
= (60.22 × 10²³ atoms) ÷ (6.022 × 10²³ atoms/moles)
= 10 moles
∴ there are 10 MOLES of Sodium.HELP FAST!! Two carbon atoms (Group 14) bond with two hydrogen atoms (Group 1) to form acetylene (C2H2). How would each carbon
atom in acetylene bond? (1 point)
Each carbon atom would share one pair of electrons with hydrogen and three pairs with the other carbon
atom
Each carbon atom would share one pair of electrons with the other carbon atom and three pairs with each
hydrogen atom
Each carbon atom would share one pair of electrons with the other carbon atom and two pairs with each
hydrogen atom
Each carbon atom would share one pair of electrons with hydrogen and one pair with the other carbon
atom
Answer: C
Explanation: Each carbon atom would share one pair of electrons with hydrogen and three pairs with the other carbon atom.
Each carbon atom would share one pair of electrons with hydrogen and three pairs with the other carbon atom Hence option A is correct.
What are electrons?Electrons are defined as a subatomic particle with a negative charge that makes up the nucleus of an atom along with protons and neutrons. Gravitation, electromagnetic interactions, weak interactions, electricity, magnetism, chemistry, and thermal conductivity are just a few of the physical processes that depend on electrons.
An atom of carbon has four electrons. It needs four electrons to become stable because that is its outermost shell. Three pairs of electrons are covalently bound between two carbon atoms to form acetylene, and the final pair is covalently joined to two hydrogen atoms.
Thus, each carbon atom would share one pair of electrons with hydrogen and three pairs with the other carbon atom Hence option A is correct.
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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.
What evidence exists for a more recent increase in greenhouse gas concentrations in the atmosphere
Answer:
-data collected from Mauna Loa shows an increase in CO2 by 20% in the last 40 years
-ice core data shows links between CO2 and temperature, with a recent increase in both
-data from ice cores and other proxies show increases in CO2, CH4, and N2O since the Industrial Revolution
Help Me Guys I Need This Now
Answer:
Answers below!
Explanation:
11. F
12. T
13. T
14. F
15. T
16. T
17. F
18. F
19. T
20. F
21. PC
22. CC
23. PC
24. CC
25. CC
Answer:
Sorry I'm not sure on questions 11-20 but I thought I'd answer a few since you need the answers.
21. PC
22. CC
23. PC
24. CC
25. CC
Explanation:
21 is a PC because the pencil is not changing it's form. 22 is a CC because when you're frying an egg the egg goes through a chemical change and changes form. 23 is a PC because the paper isn't being chemically changed. 24 is a CC because the ingredients in the cake and the cake itself is going through a chemical change. 25 is a CC because anything with fire is a chemical change, it is forming a new substance, and it's producing heat.
i need help solving this
3) 1.05 is the correct answer
Explanation:9.7 - 8.65 = 1.05
Answer:
1.05
Explanation:
8.65-9.7=-1.05cm
Can someone please explain me how to find charges for transition metals?
Answer:
You can determine the charge of a transition metal by looking at its anion (negatively charged ion) partner. For example, lets say you are given AuCl, and you are asked to find the charge of Au, which would be the transition metal in this case.
this what you want
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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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
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:
Li = # of atom
O= # of atom
answer:
O= 2 atoms
Li= 3 atoms
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.
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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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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