Answer:
a) 5.4 * 10^-4 moles
b) 8.2 moles
c) 0.26 moles
d) 20.76 moles
Explanation:
a)Since 1 mole of a substance has 6.02 * 10^23 atoms
x moles is present in 3.25 x 1020 atoms of lead
3.25 x 1020 atoms of lead/6.02 * 10^23 atoms = 5.4 * 10^-4 moles
b) Since 1 mole of a substance has 6.02 * 10^23 molecules
x moles is present in 4.96 x 1024 molecules of glucose
x = 4.96 x 1024 molecules of glucose/6.02 * 10^23 molecules = 8.2 moles
c) Since 1 mole of a substance has 6.02 * 10^23 formula units
x moles is present in 1.56 x 1023 formula units of sodium hydroxide
x = 1.56 x 1023 formula units /6.02 * 10^23 = 0.26 moles
d) Since 1 mole of a substance has 6.02 * 10^23 ions
x moles is present in 1.25 x 1025 copper(ll) ions
x = 1.25 x 1025 copper(ll) ions/6.02 * 10^23 ions = 20.76 moles
The number of moles in lead is 5.40 × 10⁻⁴ moles
The number of moles in glucose is 8.24 moles
The number of moles in sodium hydroxide is 0.259 moles
The number of moles in copper (II) ions is 20.76 moles
The number of moles of a substance is equal to 6.022 × 10²³ atoms. The number of moles of each given substance can be calculated by relating it to the Avogadro's constant 6.022 × 10²³ atoms.
Starting with a from the given parameters, we have:
a)1 mole of substance = 6.022 × 10²³ atomsx mole present in = 3.25 × 10²⁰ atoms of leadMaking x the subject of the formula, we have:
[tex]\mathbf{x = \dfrac{1 \ mole \times 3.25 \times 10^{20} \ atoms }{6.022 \times 10^{23} \ atoms}}}[/tex]
x = 5.40 × 10⁻⁴ moles
b)1 mole of substance = 6.022 × 10²³ moleculesx moles present in = 4.96 ×10²⁴ molecules of glucose[tex]\mathbf{x = \dfrac{1 \ mole \times 4.96 \times 10^{24} \ molecules }{6.022 \times 10^{23} \ molecules}}}[/tex]
x = 8.24 moles
c) 1 mole of substance = 6.022 × 10²³ moleculesx moles present in = 1.56 × 10²³ units of NaOH[tex]\mathbf{x = \dfrac{1 \ mole \times 1.56 \times 10^{23} \ units}{6.022 \times 10^{23} \ units}}}[/tex]
x = 0.259 moles
d)1 mole of substance = 6.022 × 10²³ moleculesx moles present in = 1.25 × 10²⁵ copper ions[tex]\mathbf{x = \dfrac{1 \ mole \times 1.25 \times 10^{25} \ ions }{6.022 \times 10^{23} \ ions}}}[/tex]
x = 20.76 moles
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What is this and please explain why :)
a single atom found on the periodic table is know as an
Answer:
Element
Explanation:
A chemical element is a substance that contains only one type of atom, which is the smallest particle of an element
A sonar device on a ship sends ultrasound waves under the water to locate a submarine. It takes
the ultrasound wave 5 seconds to travel from the device to the sunken submarine and back
again. How far below the surface is the sunken submarine? (Be sure to use the proper units of
measure) * 5
Answer:
3750 m
Explanation:
We must first know the speed of sound in water in order to solve this problem.
So, speed of sound in water = 1500 meters per second
Now time taken = 5 seconds
Given that;
v = 2x/t
where x is the distance below;
vt = 2x
x = vt/2
x = 1500 * 5/2
x = 3750 m
i need help asap plz
Answer:
Incorrect
Explanation:
Sodium has 11 atoms
Answer:
[tex]incorrect......[/tex]
what are some of the relationships among thermal energy, kinetic energy, particle movement, and temperature?
Answer:
Temperature measures the average kinetic energy of the particles in a substance. Thermal energy measures the total kinetic energy of the particles in a substance. The greater the motion of particles, the higher a substance's temperature and thermal energy.
Explanation:
A substance’s total thermal energy depends on its temperature, the number of atoms, and physical state. More atoms and higher temperature mean more thermal energy. If all other conditions are the same, substances in gas form have the most thermal energy, followed by liquids, then solids.
Temperature can be measured with a thermometer. The matter inside a thermometer expands as its particles gain thermal energy and move.
Hope this helps!
Brain-List?
The kinetic energy of a body is associated with its motion and is dependant on its speed and mass. Similarly, thermal energy associated with a body increases its temperature more when it is moving.
What is kinetic energy?Kinetic energy is a form of energy generated by virtue of its motion. Kinetic energy is related with the mass m and speed v of the moving body by the expression below:
KE = 1/2 mv².
Thus, kinetic energy increases with an increase in mass and velocity of the body. When the particles are under motion with raised temperature, the molecules inside body overcome the energy barrier to move and aquire more kinetic energy.
Thus an in increase in thermal energy results in an increase in temperature of the body as well increase in kinetic energy. The overall change in both kinetic and thermal energy depends on the mass, speed of motion and temperature of the system.
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please help me currently failing junior year
Answer:
option B
hope this helps :D
An object has a mass of 22.5 grams and a volume of 13.7 cm3. What is the density?
Answer:
M=22.5 grams
Volume= 13.7 cm^3
p=m/v
Divided and p= 1.64 g/cm^3
A sample of SO2 gas has a volume of 2.36 L at a temperature of 27°C. At what temperature will the gas have a volume of 1.45 L?
Answer:
New temperature T2 = 16.59°C Approx
Explanation:
Given:
Old volume V1 = 2.36 L
Old temperature T1 = 27°C
New volume V2 = 1.45 L
Find:
New temperature T2
Computation:
Using Charles's Law;
V1T2 = V2T1
(2.36)(T2) = (1.45)(27)
New temperature T2 = 16.59°C Approx
18. Which factor does NOT affect weather?
O mountains
O phases of the moon
O cloud cover
O large bodies of water
Clyed made a diagram to compare characteristics of two kinds of plants
Answer:
maybe
Explanation:
you could be high risk for coronavirus if you have asthma and are not safe.
in this equation, what shows that transmutation has taken place?
PLEASE ANSWERR!
Answer:
B
Explanation:
I'm 99.9% sure that was the answer when I had this question last year
Answer:
C, the nucleus of an atom changes.
Explanation:
Ape.x
what do i do if my crush likes another girl?
Answer: tell that person how u feel
Explanation: If it doesn’t go well ask if u can just stay friends
Answer:
personaly i wouldn't get involved but you wanna tell him/her how you fell go for it.
5.00g of CaC12 in 95.0 g of water
Answer:
Explanation:
lo8
how many moles are in 3 grams of Hydrogen gas.
Answer:
Number of moles = 1.5 mol
Explanation:
Given data:
Number of moles = ?
Mass in gram = 3 g
Solution:
Formula:
Number of moles = mass/molar mass
Molar mass of hydrogen gas = 2.02 g/mol
By putting values,
Number of moles = 3 g / 2.02 g/mol
Number of moles = 1.5 mol
How many moles of Ca are in 3.75 x 1025 atoms of Ca? Group of answer choices 3.75 mol 0.016 mol 2.26 x 1049 mol 62.3 mol
Answer:
62.3 moles of Ca
Explanation:
1 mole of a substance is defined as 6.022x10²³ particles of this substance. For example:
1mol of electrons = 6.022x10²³electrons
1mol of atoms = 6.022x10²³atoms
1 mol of molecules = 6.022x10²³ molecules
And 1mol of atoms of Ca = 6.022x10²³ atoms of Ca
That means 3.75x10²⁵ atoms of Ca are:
3.75x10²⁵ atoms of Ca * (1 mole of Ca / 6.022x10²³ atoms) =
62.3 moles of Ca
If the rate constant of a reaction is 0.010 L/mols at 30 °C, calculate the rate constant at 100 °C assuming the rate doubles for each 10 °C rise in temperature.
It says that the answer is 1.3 L/mols, but I don't understand why.
Answer:
1.3L/mols
Explanation:
At 30°C the rate constant is 0.010L/mols
As the rate doubles for each 10° rise in temperature:
At 40°:
0.010L/mols*2 = 0.020L/mols
At 50°C:
0.020L/mols*2 = 0.040L/mols
At 60°C:
0.040L/mols*2 = 0.080L/mols
At 70°C:
0.080L/mols*2 = 0.160L/mols
At 80°C:
0.160L/mols*2 = 0.320L/mols
At 90°C:
0.320L/mols*2 = 0.640L/mols
And at 100°C:
0.640L/mols*2 =
1.280L/mols ≅
1.3L/mols16) Which scientist and model/experiment unintentionally discovered the electron?
A. Rutherford - Gold Foil Experiment/Nuclear
B. Thompson - Cathode Ray Tube/Plum Pudding
C. Bohr Model - Planetary Model
D. Schrodinger - Electron Cloud Model
Answer:
B. Thompson - Cathode Ray Tube/Plum Pudding
Explanation:
The scientist and the model/experiment that unintentionally discovered the electron was the Thompson's - Cathode Ray Tube/Plum Pudding.
Experiments on the discharge tubes was performed by J.J Thomson in 1897 and this led to the discovery of the electron as a subatomic particle.
The properties of the cathode rays were studied and presented by Thomson in his work at that time.
He observed that cathode rays move in a straight line normal to the cathode and can cast the shadow of an object placed along their path. They possess kinetic energy and so can cause the motion of a mechanical paddle wheel placed along their path They attract positive charges and repel negative charges.1.
Acompound formed during the incomplete combustion of plastics shows the following percentage composition:
44.76%
1.25%H
44.05 % CI 9.94 % O
The molar mass is known to be 321.97 g/mol. Determine the empirical formula and the molecular formula for this compound
The empirical formula : C₆H₂Cl₂O
The molecular formula : C₁₂H₄Cl₄O₂
Further explanationGiven
The percentage composition
Required
The empirical formula and the molecular formula
Solution
The mol ratio of the components :
C : H : Cl : O
=44.76/12 : 1.25/1 : 44.05/35.5 : 9.94/16
=3.73 : 1.25 : 1.241 : 0.621 divide by 1.241
= 3 : 1 : : 1 : 0.5 x 2
= 6 : 2 : 2 : 1
The empirical formula : C₆H₂Cl₂O
(Empirical formula)n=molecular formula
(C₆H₂Cl₂O)n=321.97
(160.986)n=321.97
n=2
(C₆H₂Cl₂O)₂=C₁₂H₄Cl₄O₂
The molecular formula : C₁₂H₄Cl₄O₂
Which of the following is the correct definition of chemical energy?
A. energy stored in chemical bonds of molecules
B.
energy an object has because of its motion or position
C.
energy of an object due to the random motion of its atoms and molecules
D.
energy produced from the splitting of atoms
Answer:
A
Explanation:
energy stored in chemical bonds of molecules
How do organisms get energy from their environment?
Answer: They either eat other organisms or plants they take in the sun and water.
How many moles of Al2O3 are formed from the reaction of 6.38 mol O2 and 9.15 mol Al?
With Explanation please !
Moles of Al₂O₃ formed : 1.42
Further explanationGiven
6.33 mol O₂
9.15 mol Al
Required
moles of Al₂O₃
Solution
Reaction
4Al + 3O₂ ⇒ 2Al₂O₃
Find limiting reactant (mol : coefficient) :
Al = 9.15 : 4 = 2.29
O = 6.38 : 3 = 2.13
O₂ as a limiting reactant(smaller ratio)
Mol Al₂O₃ based on mol O₂ as a limiting reactant
From equation, mol ratio Al : Al₂O₃ = 4 : 2, so mol Al₂O₃ :
= 2/3 x mol O₂
= 2/3 x 2.13
= 1.42
nonmetals break easier than metals we say nonmetals are weak or ___
Answer:
brittle
Explanation:
Answer:
brittle
Explanation:
Why is paper towel absorbing water a chemical change
Answer:
it is not a chemical change
Explanation:
it is a physical change as a paper towel can be dried in the sun to turn into a regular paper towel thus proving that a paper towel absorbing water is a physical change not a chemical change
please help me !!! im failing :(
Answer: H
H- C- H
H
Explanation:
Lewis structures are the structures which represent the valence electrons of the element around the chemical symbol of the element.
Carbon is an element which belong to group 14. Atomic number of carbon is 6 that means it contains 6 electrons, Thus the electronic configuration is represented as: [tex]1s^22s^22p^2[/tex] . Thus the valence electrons are 4.
Hydrogen is an element which belong to group 1. Atomic number of hydrogen is 1 that means it contains 1 electron, Thus the electronic configuration is represented as: [tex]1s^1[/tex] . Thus the valence electron are 1.
The four valence electrons of carbon are shared with one valence electron of hydrogen each.
Explain what happens during cytokinesis. This needs to be detailed.
Answer:
During cytokinesis, which is a physical process of cell division, the cells divide the cytoplasm of a parent cell into two daughter cells. The ring on the outside of the cell which is also known as a contractile ring, shrinks at the equator of the cell which causes pinching, and the plasma membrane goes inward. After all that happens there’s something called a cleavage furrow which is the formation of a dip between the two cells while they are splitting.
(You can sum it up, but I hope this helps!)
#3 What size container would 67.3mol CO2 need at STP?
Answer:
The volume of the container would be 1507 L
Explanation:
These question can be solved in two different ways:
Let's do the short road.
We know that 1 mol of anything at STP conditions occupies 22.4 L
By a rule of three:
1 mol contains 22.4L at STP
Then, 67.3 mol of gas would be contained in (67.3 . 22.4) /1 = 1507.5 L
We assume CO₂ as an Ideal Gas, so we can apply P . V = n . R . T
At STP, T is 273.15K and P = 1 atm. We replace:
1 atm . V = 67.3 mol . 0.082 . 273.15K
V = (67.3 mol . 0.082 . 273.15K) / 1 atm → 1507 L
Which is the correctly balanced equation? *
A Ca + HCl → CaCl2 + H2
B Ca + HCl → CaCl2 + H2
cCa + H2Cl2 → CaCl2 + H2
D Ca + 2HCl → CaCl2 + H2
PLEASE ANSWER I WILL GIVE BRAINLIEST
Answer:
Ca + 2HCl → CaCl2 + H2
Explanation:
This ia balanced equation on both side 1 Ca and 2 H and 2 Cl are present
The dog will eat more food to store fat and grow more hair.
The dog will lay in the sunlight to transpire
The dog will pant to circulate air throughout the body to cool
down
3.
The dog will grow a thick winter coat to keep warm during the
In the summer months, what is this dog's likely response to the rising temperatures?
summer
CLEAR ALL
hibernation exclamation mark
In the formula for an ionic compound, the negative ion is
always written first.
TRUE
FALSE
Answer: False
Explanation: In the written form of an ionic compound, the positively charged cation always comes before the negatively charged anion. For instance, the written name for is calcium chloride because the compound has calcium () cations and chloride () anions.
In the formula for an ionic compound, the negative ion is always written first. This statement is false.
What do you mean by an ionic compound ?The term an ionic compound is defined as a chemical compound composed of ions carried together by electrostatic forces termed ionic bonding.
The compound is neutral charge, but made up of positively charged ions called cations and negatively charged ions called anions.
The compounds that affect a metal binding with either a non-metal or a semi-metal will display ionic bonding.
In the formula an ionic compound, the positively charged cation always comes before the negatively charged anion.
For example, the written name for is calcium chloride because the compound has calcium (+) cations and chloride (-) anions.
Thus, In the formula for an ionic compound, the positive ion is always written first.
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answers to student exploration : stoichometry (GIZMOS) WORTH 100 POINTS AND BRAINLIEST
