Chemistry College
Answers
Answer 1
Answer:
two oxygen atoms
Explanation:
One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1023 molecules of oxygen but 12.04 X 1023 (2 X 6.02 X 1023) atoms, because each molecule of oxygen contains two oxygen atoms.
Answer 2
Answer:
2 * (6.02 * 10^23)
Explanation:
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Related Questions
After burning your candle for a few hours you and your friend notice that it's mass has decreased. Your friend claims that the mass "disappeared". Why do you know he is wrong (Hint: it's a Scientific Law)? What actually happened to the mass? What form is that mass in now? What is this process called?
Answers
Answer:
The law of conversion of mass is a scientific law that says that mass or matter can not be created or destroyed like energy but changes its form in a different type of state. So, by the law of conversion of mass, you can say that mass is not disappeared but change in different forms of states of matter like gas, soot, or melted residues of candle and ash of thread.
Due to this, the mass of the solid or waxy state due to burning changes to gas released by burning and residue of wax that will be equal to the mass of the original mass.
What kind of chemical bond forms when electrons are given away or taken on?
Answers
Answer:
ionic bonding
Explanation:
In ionic bonding, electrons are completely transferred from one atom to another. In the process of either losing or gaining negatively charged electrons, the reacting atoms form ions. The oppositely charged ions are attracted to each other by electrostatic forces, which are the basis of the ionic bond.
Answer:
Covalent Bonds
Explanation:
Two solutions initially at 24.60°C are mixed in a coffee cup calorimeter. when a 100.0 ml volume of 0.100 m AgNO3 solution is mixed with a 100.0 ml sample of 0.200 m nacl solution, the temperature in the calorimeter rises to 25.30°C. Determine the dh for the reaction as written below. Assume that the density and heat capacity of the solutions is the same as that of water.
NaCl(aq)+AgNO3(aq) → AgCl(s)+NaNO3(aq)
a. -69 kJ
b. -35 kJ
c. -16 kJ
d. -250 kJ
Answers
Answer:
= - 59.7 kJ/mol
Explanation:
The total volume of the solution is:
= (100 + 100 ) mL
= 200 mL
mass of the solution = 200 × 1.00 = 200 g
Heat gained by the solution:
= mass × specific heat × temperature change in solution
= 200× 4.184 × (25.3 - 24.6)
= 585.76 J
Heat gained by calorimeter
= heat capacity × change in temperature of caiorimeter
= 15.5 × (25.3 -24.6)
= 10.85 J
Thus, total heat released = total heat gained
= 585.76 + 10.85 J
= 596.61 J
The no of moles of AgNO3 = 100/1000 × 0.100 = 0.01 mol
The no of moles of NaCl = 100/1000 × 0.200 = 0.02 mol
From above, it is obvious that AgNO3 is the limiting reagent
∴
ΔH_{rxn} = total heat released/ moles of AgNO3
= -596.61/0.01
= 59661 J/mol
= - 59.7 kJ/mol
The mole fraction of NaCl in an
aqueous solution is 0.132. What is
the weight/weight percent of NaCl in
this solution?
Molar Mass
NaCl: 58.44 g/mol
H20: 18.016 g/mol
Hint: Remember to give your answer as a percent!
Answers
The weight/weight percent(%w/w) of NaCl in solution : 33.03%
Further explanation
Given
Mole fraction of NaCl : 0.132
Required
The weight/weight percent of NaCl
Solution
1 mol solution : 0.132 mol NaCl + 0.868 mol H₂O
mass NaCl :
[tex]\tt 0.132\times 58.44 g/mol=7.714~g[/tex]
mass H₂O :
[tex]\tt 0.868\times 18.016~g/mol=15.64~g[/tex]
Total mass = 7.714 + 15.64 = 23.354 g
[tex]\tt \%NaCl=\dfrac{7.714}{23.354}\times 100\%=33.03\%[/tex]
i have it convert a number in scientific notation and it's asking me where should I move the decimal point
Answers
Answer: When converting from Scientific Notation to a standard or normal notation, use the value of the exponent to determine the number of places to move the decimal point. Move the decimal place to the right if the exponent is positive and move the decimal place to the left if the exponent is negative.
Explanation: I got this from a website but I still hope it helps!
Answer: if i were to convert a Scientific notation and it was 5.1³ then i would move the decimal point 3 times making it 5100 but if it were some thing like 5.123² you'd move the decimal 2 pts. making 512.3
How many electrons are in the nucleus of an atom with an atomic number of 7?!!
Answers
There are two electrons
Help!!!!
A termplate of a Venn diagram representing common and differentiating characteristics of covalent and ionic bonds is
shown.
lonic
Bond
Covalent
Bond
A
C
Which of the following characteristics can be written only in space B?
O Occurs in substances that have at least one non-metal
O Occurs in substances that have a repeating lattice structure
O Occurs in substances that have discrete molecular structure
O Occurs in substances that have high melting points
Answers
Answer: it ISNT occurs in substances that have discrete molecular structure
Explanation:
I took the test
The characteristics that can be written only in space B is they occur in substances that have at least one non-metal. The correct option is A.
What is ionic and covalent bond?
Ionic bonds are formed when two electrically charged elements shred their charged ions. Covalent bonds are formed when there is a mutual sharing of electrons between the atoms.
One condition that is similar in both is both bonds needed one non-metal to form the bond.
Thus, the correct option is A, which occurs in substances that have at least one non-metal.
Learn more about the ionic and covalent bonds, here:
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Explain your observations. What did you observe as time passed in each can of liquid? Did you see a significant change in temperature? Why or why not? Submit your data chart here.
Answers
Answer:
Hey there.. the question is not proper. Please give the whole question
Match the functions with the corresponding cell structure.
Column A
1.
Cell Membrane:
Cell Membrane
2.
Nucleus:
Nucleus
3.
Cytoplasm:
Cytoplasm
Column B
a. Protect the DNA and genes required for protein synthesis
b. Enclose the components of the cell and Regulate passage of substances through the cell
c. Houses the major organelles such as the mitochondria that are essential for creating energy.
Answers
Answer:
1c 2a 3b
Explanation:
Answer:
1.C
2.A
3. B
Explanation:
Which of the following would be a clue that a rock is sedimentary?
Answers
I do not see any possible answers that you have posted. But a good idea would be that it might have fossils, water currents, mud cracks, usually form in shallow seas. Hope this helps!
Answer:
no
Explanation:
How does oil impact the environment?
Oil use produces pollution in the environment.
Oil produces more gases such as oxygen in the atmosphere.
Oil can help promote plant growth.
Oil help sustain ecosystems.
Answers
Answer:
the first oneeeee
Explanation:
this i because it impacts as in change
I NEED HELP QUICK PLEASE PLEASE HELP 100 POINTS
Answers
the answer to your question is 2g of magnesium plus 1g of oxygen equals magnesium oxide
What does it mean when someone has done multiple trials? A. They have performed an experiment once and reported their findings. B. They have performed a scientific experiment more than once. C. They have performed an experiment that can only be performed once. D. They have designed an investigation to answer a question.
Answers
A. They have performed an experiment once and reported their findings.
When zinc and HCl are reacted, the product is hydrogen gas. You can measure the reaction rate by measuring what?
PLEASE HELP ME
Answers
Answer:
measuring the consumption of the products and the rate of conversion of products to reagents
Explanation:
It must be taken into account that the reaction rate also depends on the presence of a catalyst, since these advance the rate of the reaction.
During a chemical reaction, heat is absorbed. What kind of reaction occurred?
A) An endothermic reaction
B) An exothermic reaction
Answers
Answer:
Endothermic and exothermic reactions are chemical reactions that absorb and release heat, respectively. A good example of an endothermic reaction is photosynthesis. Combustion is an example of an exothermic reaction. The categorization of a reaction as endo- or exothermic depends on the net heat transfer.
Explanation:
Answer:
An endothermic reaction
Explanation:
The heat is being absorbed so it's and endothermic reaction
How many moles of solute are present in a solution of 0.165 L of 0.39 M NaNO3?
Answers
Answer:
00.8755521
Explanation:
What is the nuclear charge of an atom of Silver?
A) +79
B) +47
C) +108
D) +61
Answers
Answer:
47 is your correct ans, which is b
A 3.74-L cylinder contains 4.17 g of methane, CH4, at a pressure of 3020 mmHg. What is the temperature of the gas
Answers
Answer:
T = 694 K
Explanation:
Given the following data:
V= 3.74 L
mass = m = 4.17 g
P = 3020 mmHg x 1 atm/760 mmHg= 3.97 atm
We use the ideal gases equation to calculate the temperature (T):
PV= nRT ⇒ T= PV/nR
We calculate n (number of moles of methane gas) by dividing the mass into the molar mass of methane (CH₄):
molar mass(CH₄) = MM = (1 x 12 g/mol)+ (4 x 1 g/mol) = 16 g/mol
n = m/MM= 4.17 g/(16 g/mol)= 0.261 mol
Finally, we calculate T:
T= PV/nR = (3.97 atm x 3.74 L)/(0.261 mol x 0.082 L.atm/K.mol) = 694 K
Formation of a new substance is a sign of a
change.
A)
Physical
B)
Chemical
Kinetic
D)
Electrical
Answers
The answer is B. chemical
The compound with the molecular formula C4H10 is called
Answers
Answer:
butane
Explanation:
I hope this helps!
Answer:
Butane
...............
What is bonding all about in chemistry?
Answers
A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. The bond may result from the electrostatic force of attraction between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds.
Answer:
It is like about a attraction between atoms, molecules, and more.
In a coupled reaction, energy needs to be created to drive a second reaction forward. True or false
Answers
Answer:
I would say false.
Explanation:
Hope it helps:)
which proccess do NOT build mountains
Answers
Answer:
its does not
Explanation:
not do...................
The picture shows to containers filled with a gas, both initially at room temperature
AAA
Ice
Heat
Which statement is correct? (5 points)
The gas particles in both containers have the same average kinetic energy because they have equal number of particles
The gas particles in both containers have the same average kinetic energy because they have the same volume
The average kinetic energy of the gas particles is greater in container A because it has a lower temperature
The average kinetic energy of the gas particles is greater in container 8 because its particles move faster
Od
Answers
Answer:
D. The average kinetic energy of the gas particles is greater in container B because its particles move faster.
Explanation:
Option D is the correct statement. From the excerpt, it can be seen that container B is being heated. The heat that is applied to container B will make the temperature of the gas to increase, thereby increasing the average kinetic energy. This will cause the gas molecules to mover faster and with force hitting the walls of the gas container. At this time, pressure should increase. Also, the volume of the gas increases just as the temperature of the gas also increases.
Answer:
D. The average kinetic energy of the gas particles is greater in container B because its particles move faster.
Explanation:
Which properties of plastics are useful in transporting food and drink?
Answers
Answer:
mark me brainlist plzzzzzzzzzzzzzz
Explanation:
Answer: In plastic, particles are very much tightly packed ,so food and drink kept in it do not get spoiled easily and its contact with environment gets cut off. So it is useful in transporting food and drink.
nitrogen and phosphorus would form what kind of bond
Answers
Answer:
The size of a phosphorus atom also interferes with its ability to form double bonds to other elements, such as oxygen, nitrogen, and sulfur. As a result, phosphorus tends to form compounds that contain two P-O single bonds where nitrogen would form an N=O. double bond.
Explanation:
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Which element has the same number of electrons in the outermost energy level at Lithium?
A. Hydrogen
B. Beryllium
C. Carbon
D. Magnesium
Answers
Answer:
Hydrogen is your answer because lithium and hydrogen both have 1 electron in their outermost energy level
The molar mass of a compound is equal to which of the following?
Group of answer choices
the sum of the number of protons in the compound
the sum of the atomic numbers of the elements
the sum of the number of electrons in the compound
the sum of the atomic masses of the elements
Answers
Answer:
the sum of the atomic masses of the elements
Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. Therefore, the correct option is option D.
What is mass?
Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.
The relative mass is the mass that is with respect to mass of a matter that is considered as standard. In chemistry relative mass is equal to the mass of one-twelfth the mass of C-12 isotope .
Out of relative and average atomic mass, relative atomic mass is more accurate as it is calculated with respect to a standard quantity. Molar mass is mass of 1 mole of a compound. Molar mass is the sum of the atomic masses of the elements.
Therefore, the correct option is option D.
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According to the ,cell theory where do cells come from?
Answers
Answer:
cells come from pre existing cells
1.Which is the largest atom in Group 1?
2.Which is the smallest atom in Group 15
3.Which is the smallest atom in period 5?
4.Which is the largest atom in Period 4?
Answers
1. Francium
2. Nitrogen
3.rubidium
4. Krypton
