Answer:
Explanation:not
A sample of calcium oxide (cao) has a mass of 2.80 g. the molar mass of cao is 56.08 g/mol. how many moles of cao does this sample contain? 0.0499 moles 20.0 moles 58.9 moles 157 moles
Answer:
0.0499 moles
Explanation:
56.08g => 1 mol
2.80g => y mol
Y = 2.80/56.08 = 0.0499 moles
A sample of calcium oxide (CaO) has a mass of 2.80 g. the molar mass of CaO is 56.08 g/mol. No. of moles of CaO this sample contain are 0.499.
What is mole concept?Avogadro's number is the number of units in one mole of any substance and equals to 6.02214076 × 10²³. The units can be electrons, atoms, ions, or molecules.
No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.
Mass of a particular product is also find out by stoichiometry of a reaction as per the no. of mole given in the reaction.
No. of moles = Mass of compound ÷ Molar mass of compound
No. of moles = 2.80 ÷ 56.08 = 0.0499
Therefore, A sample of calcium oxide (CaO) has a mass of 2.80 g. the molar mass of CaO is 56.08 g/mol. No. of moles of CaO this sample contain are 0.499.
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The molecular weight of table salt, NaCl, is 58. 5 g/mol. A tablespoon of salt weighs 6. 37 grams.
Calculate the number of moles of salt in one tablespoon.
First, complete the unit conversion using dimensional analysis:
Answer:
Answer in picture
Explanation:
describe ph scale in detail
Answer:
pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.
1. You have 100 ml of water. What is its mass?
Answer:
100 grams
Explanation:
CHEM HELP
3. Use the equation for Charles’s Law to calculate the following. (2pts)
A balloon is filled up to 1 liter at a temperature of 294.15K. The balloon is then placed in a freezer for 24 hours at a temperature of 273.15K.
What is the volume of the balloon when it is taken out?
Answer:
It had changed by .001 liters because of the way that cold air can't evaporate more than .5 liters of air
Explanation:
Does tilt of earths axis of rotation influence climate
Answer:
The greater Earth's axial tilt angle, the more extreme our seasons are, as each hemisphere receives more solar radiation during its summer
Explanation:
which particle is gained and lost during a redox process?
Answer:
electrons
Explanation:
A redox reaction is one in which oxidation and reduction takes place. in the sense of
oxidation being the loss of electrons and reduction the gain of electrons.
According to Newton’s Third Law, if someone jumps off a skateboard, the skateboard will roll backwards because -
Answer:
for the force that sent the person forward, there is an equal force pushing back on the skateboard
Convert 3828 ml to L
Answer:
divide the volume value by 1000
So 3828/1000=3.828
Which of the following is not a source of light?
A. The moon
B. A glowworm
C. A star
D. Car headlight
Answer:
A. The moon
Explanation:
This is because the sun gives the moon the light the moon doesn't make it.
A chemical change occurs when one or more substances change into entirely new substances with new and different properties. true or false?
Answer:
true
Explanation:
what is substance take change everything changes
Calculate the number of representative particles. 5.00 mol Cl2
how can i discribe the properties of each state of water when cooling and heating occurs?
Answer:
When it is cold, it's hard for the molecules and whatever microscopic organisms live there to move around.
When it is hot, the molecules will move quicker due to a chemical reaction with the atoms and other forms of energy increasing with the heat energy. This reaction happens because 2 forms of energy meet.
I hope this helps!
As we increased the mass of the ball what happens to the acceleration?
As the mass of an object increases, its acceleration decreases. Acceleration is inversely proportional to mass.
describe what makes a diamond a mineral
Answer:
isn't diamond made from black coal? haha... just kidding. se the answer below
Explanation:
Diamond is a rare, naturally occurring mineral composed of carbon. Each carbon atom in a diamond is surrounded by four other carbon atoms and connected to them by strong covalent bonds - the strongest type of chemical bond.Diamond is the hardest known natural substance.
I hope I helped.
why are atoms attracted to each other in an ionic bond?
Answer:
The answer is C. Inversely, when this atom gains a positively charged ion. (The atom) becomes a negatively charged atom or an "anion".
Explanation:
Since electrons are negatively charged, an atom that loses one or more electrons will become positively charged, an atom that gains one or more electrons becomes negatively charged. The oppositely charged ions attract each other to form ionic networks (or lattices)
Answer:
opposite charges attract
Explanation: Ionic bonding is the attraction between positive and negative charge ions electrostatics explains why this happens: opposite charges attract and like charges repel. when many ions attract each other, they form large, ordered, crystal lattices in which each ion is surrounded by ions of the opposite charge. Happy to help my friend
A mixture is prepared by mixing 29.27 mL of the blue dye solution with 35.00 mL of the red dye solution and 14.73 mL of the yellow dye solution. What is the molar concentration of the blue dye in the mixture
If a mixture is prepared by mixing 29.27 mL of the blue dye solution with 35.00 mL of the red dye solution and 14.73 mL of the yellow dye solution, the molar concentration of the blue dye in the mixture is
MB'=0.1189M
What is the molar concentration of the blue dye in the mixture?Generally, the equation for the moles is mathematically given as
Moles=Molarity *volume
Therefore
For Blue dye
MB=0.3523*25.27*1/1000ml
MB=8.90*10^{-3}
For red dye
MR=0.1017*35.27*1/1000ml
MR=3.55*10^{-3}
For yellow dye
MY=0.3523*14.73*1/1000ml
MY=2.27*10^{-3}
Where
Total volume is
T=25.27+35.ml+14.73
T=75ml
In conclusion, The molar conc of blue dye is
[tex]MB'=\frac{8.90*10^{-3}*1000}{75}[/tex]
MB'=0.1189M
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ASAP HELP, PLEASE HELP ASAP
Which statement accurately compares kinetic and Potential energy?
Question 5 options:
Gravity affect the amount of both kinetic and potential energy
Both kinetic and potential energy are a result of an unbalanced force acting on the object
Potential energy and kinetic energy both gain energy from standing still
Kinetic and Potential energy affect an object the same
Answer: gravity affect the amount of both kinetic and potential energy
Explanation:
Which of the following is a benefit of hydroelectric dams?
It allows for control of downstream seasonal Fooding
O
The reservoir can be a tourist attraction
o
There are no air pollutants are released during electricity
generation
OAll of the above
Answer:
I'm pretty sure it all of the above
sorry if I'm wrong
Explanation:
What is the concentration of S2−
in equilibrium with MnS(s) (sp=4. 6×10−14)
and 0. 083
M Mn2+
?
The concentration of S2−in equilibrium with MnS(s) (sp=4. 6×10−14) and 0.083M Mn2+ is mathematically given as
[s^2-]=61.333*10^{-14}M
What is the concentration of S2−?Generally, the equation for the solubility constant is mathematically given as
Ksp=[Mn^2+][s^2-]
Therefore
4.6*10^{-14}=0.075*[s^2-]
[s^2-]=4500/0.075*10{-14}
[s^2-]=61.333*10^{-14}M
In conclusion, The concentration of S2−
[s^2-]=61.333*10^{-14}M
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List in order which digits are significant in the following numbers:
a. 230 mL.
b. 0.00540 s
c. 1440
d. 50 ℃
e. 0.9405 g/cm3
f. 700 jellybeans
g. 1.05 x 106
Answer: see below
Explanation:
Zeros between the digit and decimal point are NOT significant.
Zeros between digits ARE significant.
a. 230 mL. sf: 23
b. 0.00540 s sf: 540
c. 1440 sf: 144
d. 50 ℃ sf: 5
e. 0.9405 g/cm3 sf: 9405
f. 700 jellybeans sf: 7
g. 1.05 x 10⁶ sf: 105
What is the benefit of having a detailed procedure to follow
Answer:
see answer below
Explanation:
LOL idk what this question is about but to my understanding, having a detailed procedure gives u more clue on what u r doing and how u r doing it. think of this like a instruction manual, if u want to build a telescope and have no idea how to build it and the instrutions only give u short sentences like"screw nails next to the finger scope" or something like that wouldnt help much. i dont know about u but i rather prefer instructions written like this"first screw the nail beside the finger scope, DO NOT unscrew the botton" and continue. i cant build a telescope so yea dont know any directions to that.
Why is it proposed that the work of ATP is analogous to the work of money
Wave interference occurs only when a wave is reflected.
TRUE or false
Answer:
False
Explanation:
It occurs when two waves meet while traveling along the same medium.
please help Why can we listen to radio or watch TV indoors?
A. It will work as long as the room has hardwood.
B. Walls absorb most of the incoming waves
C. It will work as long as the room is carpeted.
D. Walls don’t absorb the incoming waves
Answer:
D
Explanation:
A: not true. You could have cement floors and still receive radio/TV
B: not true. Very little of the waves are absorbed by the walls.
C: not true. You can receive radio/TV if there isn't a carpet in the entire house.
D: Dis the answer. Walls don't absorb the incoming waves or not much of them
9.3 mol H2O =
molecules H2O
Answer:
5.6 x 10²⁴ molecules H₂O
Explanation:
9.3 moles * (6.02214076 x 10²³) = 5.6 x 10²⁴
The Avogadro constant = 6.02214076 x 10²³
This constant is the number of particles (such as atoms, ions, or molecules) in one mole of something.
2. Which have a positive charge?
O atoms
O protons
O neutrons
O electrons
Answer:
protons
Explanation:
have a positive charge
Answer:
Protons!
Explanation:
Protons are positve! Protons start with P, and Positive starts with P. This is a very handy trick!
12.09 kcal of energy is added to 45 grams of water at an initial temperature of
23.4°C. What is the final temperature of the water?
For 12.09 kcal of energy, added to 45 grams of water at an initial temperature of 23.4°C, the final temperature of the water is mathematically given as
T2=290C
What is the final temperature of the water?Generally, the equation for the Energy is mathematically given as
Q=mcdT
Therefore
Q=mcdT
12.09=45*(23.4-T2)
T2=290C
In conclusion, the final temperature is
T2=290C
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Ammonia molecules are composed of carbon and sulfur and is used as a fertilizer.
True
False
Answer:
Ammonia (NH3) is composed of Nitrogen and 3 Hydrogens
Explanation:
Is the water cycle a scientific model. (I don't rember lol)
(Yes)
Or
(No)