Answer: Eggshells have a similar chemical composition to our tooth enamel, making them react similarly with other chemicals. This can help us understand what stains tooth enamel. When we brush an eggshell with fluoridated toothpaste, it strengthens the shell and protects it from acid, just like it does for our tooth enamel
Explanation:
Answer: Eggshells have a similar chemical composition to our tooth enamel, making them react similarly with other chemicals. This can help us understand what stains tooth enamel. When we brush an eggshell with fluoridated toothpaste, it strengthens the shell and protects it from acid, just like it does for our tooth enamel.
What is the mass of hydrogen produced when 8.0 g of sodium
reacts with an excess of water to produce hydrogen and sodium
hydroxide? The equation is given.
2 Na + 2 H2O → 2NaOH + H2
Answer:
Mass = 0.35 g
Explanation:
Given data:
Mass of sodium = 8.0 g
Mass of hydrogen produced = ?
Solution:
Chemical equation:
2Na + 2H₂O → 2NaOH + H₂
Number of moles of sodium:
Number of moles = mass/molar mass
Number of moles = 8.0 g/ 23 g/mol
Number of moles = 0.35 mol
now we will compare the moles of sodium and hydrogen
Na : H₂
2 : 1
0.35 : 1/2×0.35 = 0.175 mol
Mass of hydrogen:
Mass = number of moles × molar mass
Mass = 0.175 mol × 2 g/mol
Mass = 0.35 g
Determine the number of grams in each of the quantities
1.39.0 x 1024 molecules Cl2
Mass of Cl₂ : 164.01 g
Further explanationA mole is a number of particles(atoms, molecules, ions) in a substance
This refers to the atomic total of the 12 gr C-12 which is equal to 6.02.10²³, so 1 mole = 6.02.10²³ particles
Can be formulated :
N = n x No
N = number of particles
n = mol
No = 6.02.10²³ = Avogadro's number
mol Cl₂ :
[tex]\tt n=\dfrac{N}{No}\\\\n=\dfrac{1.39.10^{24}}{6.02.10^{23}}\\\\n=2.31[/tex]
mass Cl₂(MW=71 g/mol) :
[tex]\tt mass=mol\times MW\\\\mass=2.31\times 71=164.01[/tex]
Answer:
hui
Explanation:
How does dermal tissue play a key role in transpiration?
Answer:
Dermal tissue of the stems and leaves is covered by a waxy cuticle that prevents evaporative water loss. Stomata are specialized pores that allow gas exchange through holes in the cuticle. Unlike the stem and leaves, the root epidermis is not covered by a waxy cuticle which would prevent absorption of water.
Explanation:
A blue solid X is soluble in water which method is used to obtain pure solid x from an aqueous solution
Answer:
The answer is crystallisation
Using the electronegativity chart below, determine which compound would have the highest polarization
A. Li-O
B. B-F
C. H-CI
D. Be-Br
Answer:
A. Li-O
Explanation:
The highest polarization will occur between the atoms of Li-O because they have the most electronegativity difference between them.
Polarization occurs when there is a separation of charge between the atoms of heteronuclear molecules.
The electronegativity gives the tendency for an atom to attract the electrons within the bond pair to itself.
To know the atom with most polarization, it has to be one with highest electronegativity difference. Li and O have the highest difference. Also, since the bond is between a metal and non-metal, it is obviously the most polarized.
how many atoms are in a compound
Answer:
Compounds are made of two or more atoms of different elements,
Explanation:
Answer:
6.022×1023 atoms —1.00 mol of atoms.
Explanation:
Which answer choice correctly lists only elements?
A
Cl, Na, CH3, Ne
B
Mg, NO2, Mg, B
C
H2O, Li, N, I2
D
N2, O2, Al, Zn
Group of answer choices
A
Answer:
D
Explanation:
Nitrogen^2, Oxygen^2, Aluminum, Zinc
the others have combination
EXPLAIN What is one way that the thermal energy of a system can be changed?
Answer:
When the temperature of an object increases, the average kinetic energy of its particles increases. When the average kinetic energy of its particles increases, the object's thermal energy increases. Therefore, the thermal energy of an object increases as its temperature increases.
Explanation:
BTW I GOT THE ANSWER FROM KRISTINA
The thermal energy of a system is the amount of heat energy in it.
One way to change thermal energy is by alter the system by introducing a new object to the system.
The thermal energy of a system is calculated using:
[tex]E = \frac 12 mc\theta[/tex]
Assume the mass of the system remains unchanged.
When an object is introduced to the system, the thermal energy becomes:
[tex]E_2 = \frac 12 mc(\theta + \alpha)[/tex]
Where:
[tex]\alpha \ne 0[/tex] --- the temperature of the object.
Expand:
[tex]E_2 = \frac 12 mc(\theta) + \frac 12 mc (\alpha)[/tex]
Substitute: [tex]E = \frac 12 mc\theta[/tex]
[tex]E_2 = E + \frac 12 mc (\alpha)[/tex]
This means that the thermal energy of the system will change by the thermal energy of the object that is being introduced to the system.
Hence, one way the thermal energy can be changed is to introduce a new object (or matter).
Read more about thermal energy at:
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Worth a lot of points. Please only answer if u know the question. Thanks
Answer:
#7 is D. #4 is B. #5 is 13 #6 is C
Answer:
okokokokokokokok I will answer in just a moment
Explanation:
Plants don't grow as well when ____ has been lost.
a.
clay
c.
parent rock
b.
topsoil
d.
slope
Answer
the answer is b
explanation
Answer:
b. topsoil
Explanation:
I just took the test
A solution is
Question 6 options:
a homogeneous mixture.
a compound.
chemically separable.
a heterogeneous mixture.
Answer:
the first one. a homogeneous mixture.
Explanation:
hope this helps :)
Plants give off oxygen as part of photosynthesis. Explain the impact of this process on humans?
Answer:
i think it haven't impact because oxygen is very sensitive for our life and from plants there is so many kinds of food sources soo
12.4 g of phosphorus reacts with 9.6 g of oxygen.
Which of the following chemical equation represents this reaction?
[Relative atomic mass: P, 31; 0, 16]
A P + O2 + PO2
B 2 P + O2 + 2 PO
C 3P +2 02 → P304
D 4P +3 02 → 2 P203
Answer:
D 4P +3O₂ → 2 P₂O₃
Explanation:
In this problem, we need to convert the mass of phosphorus and oxygen to moles trying to find the ratio of reaction (The moles of P that reacts per mole of O₂):
Moles P:
12.4g P * (1mol P / 31g) = 0.4 moles
Moles O₂:
9.6g * (1mol / 32g) = 0.3 moles
The ratio of reaction is:
0.4 mol / 0.3 mol = 1.33 = 4 moles of P / 3 moles of O₂
That means 4 moles of P react with 3 moles of O₂ and the reaction that represents this ratio is:
D 4P +3O₂ → 2 P₂O₃The reaction of 12.4 g Phosphorous with 9.6 grams of Oxygen will be represented as [tex]\rm 4\;P\;+\;3\;O_2\;\rightarrow\;2\;P_2O_3[/tex]
In a chemical equation, the stoichiometric values are the moles of the molecules involved in the reaction. For the reaction of Phosphorous and oxygen, the moles of both elements are to be calculated.
Moles = [tex]\rm \frac{weight}{molecular\;weight}[/tex]
Moles of Phosphorous = [tex]\rm \frac{12.4}{31}[/tex]
Moles of Phosphorous = 0.4
Moles of oxygen = [tex]\rm \frac{9.6}{16}[/tex]
Moles of oxygen = 0.6
Moles of [tex]\rm O_2[/tex] = 0.3
The equation will be:
[tex]\rm 0.4\;P\;+\;0.3\;O_2\;\rightarrow\;2\;P_2O_3[/tex]
[tex]\rm 4\;P\;+\;3\;O_2\;\rightarrow\;2\;P_2O_3[/tex]
The correct reaction will be D.
For more information about the chemical equation, refer the link:
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I’ll marmark you brainlist
What did you include in your response? Check all that
apply.
O No, thermal energy is not being transferred by
radiation in this image.
O The eggs are in direct contact with the metal pan,
which is in direct contact with the gas flame.
O Thermal energy is being transferred by conduction.
O Radiation transfers thermal energy by
electromagnetic waves.
O Radiation does not transfer thermal energy by
direct contact.
A decrease in temperature decreases
. The reaction rate will
Answer:
The reaction rate decreases with a decrease in temperature. ... Molecules joined by stronger bonds will have lower reaction rates than will molecules joined by weaker bonds, due to the increased amount of energy required to break the stronger bonds.
How do SMRs provide more flexibility than ordinary nuclear reactors?
Select all that apply.
More reactors can be installed at a location as the energy demand increases.
Power plants can be built to fit locations with less demand or less space.
The SMRs can use multiple types of fuel and recycle byproducts if needed.
The SMRs can adjust their energy output using coolants and control rods.
Answer:
The SMRs can adjust their energy output using coolants and control rods.
Power plants can be built to fit locations with less demand or less space.
Explanation:
I think that it is but I am not sure.
Power plants can be built to fit locations with less demand or less space. The SMRs can adjust their energy output using coolants and control rods. The correct options are B and D.
What are SMRs?A wireless communications technology that competes with traditional cellular services. The base station equipment supplier is the transmitter licensee in an SMR system.
Power plants can be built to accommodate locations with low demand or limited space. Coolants and control rods allow SMRs to adjust their energy output.
These advanced reactors, which are expected to range in size from tens to hundreds of megawatts, can be used for power generation, process heat, desalination, or other industrial applications.
Light water or other non-light water coolants, such as a gas, liquid metal, or molten salt, may be used as a coolant in SMR designs.
Thus, B and D are correct options.
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#SPJ2
Information about calcium carbonate
What is calcium carbonate?
Answer:
Calcium carbonate is a dietary supplement used when the amount of calcium taken in the diet is not enough. Calcium is needed by the body for healthy bones, muscles, nervous system, and heart. Calcium carbonate also is used as an antacid to relieve heartburn, acid indigestion etc.
... yes I copied this from the internet, but hope it helps !
The PC modem was invented in what year?
Answer:
1977
Explanation:
Getting connected: a history of modems. Then, in 1977, Dale Heatherington and Dennis Hayes created the world's first PC modem, the 80-103A.
Please Help!
Which change takes place at the freezing point of a substance?
Group of answer choices
A. A gas becomes a liquid
B. A solid becomes a gas
C. A liquid become a solid
D. A gas becomes a solid
please also give me an explanation since I do not understand this.
Answer:
❤C. A liquad becomes a solid❤
Explanation:
✌When you freeze water its a scientific fact that it becomes solid.✌
Why dont people brush their teeth?Like some be going around people and everything,UGHHHHH!
Please tell me
Answer:
like so true just brush your teeth... if you can't afford it then no disrespect to you
Explanation:
Answer:
their fault when the grow up and have yellow teeth + dentures and they are like 28 XD
Explanation:
10.0 grams of a gas occupies 12.5 liters at a pressure of 42.0 mm Hg. What is the volume when the pressure has increased to 75.0 mm Hg? 6.72 L 7.00 L 22.3 L 0.143 L
Answer: 7.00 L
Explanation:
Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.
[tex]P\propto \frac{1}{V}[/tex] (At constant temperature and number of moles)
[tex]P_1V_1=P_2V_2[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 42.0 mm Hg
[tex]P_2[/tex] = final pressure of gas = 75.0 mm Hg
[tex]V_1[/tex] = initial volume of gas = 12.5 L
[tex]V_2[/tex] = final volume of gas = ?
[tex]42.0\times 12.5=75.0\times V_2[/tex]
[tex]V_2=7.00L[/tex]
Therefore, the volume when the pressure has increased to 75.0 mm Hg is 7.00 L
What is the force of attraction between two atoms that are combined?
a. chemical bond
b. atomic bond
c. physical property
d. magnetic bond
Answer:
a
Explanation
Chemical bond refers to the forces holding atoms together to form molecules and solids. This force is of an electric nature, and the attraction between electrons of one atom to the nucleus of another atom contributes to what is known as chemical bonds.
3. Which of the following is an example of a polyatomic ion?
a. NO
b. OP-
C. CI
d. Ca²+
Answer:D
Explanation:polyatomic means more then one and it have more then 1 positive ion
The two rate statements below are not the same. Use the concept of unit rates to explain
the difference.
a. LaVerne earns $10 in 2 hours.
b. Shirley earns $2 in 10 hours.
Temperature of boiling water cannot be measured by a
_____________ thermometer.
Answer:
Cannot be measured by pyrometer.
Explanation:
This is because a pyrometer measures temperatures for very hot bodies such as the sun.
Answer:
Clinical
Explanation:
Temperature of boiling water cannot be measured by a Clinical thermometer The reason behind this is that the range of clinical thermometer varies between only 35° C to 42° C.
How do the particies in a liquid create surface
tension?
It's been a while since I've taken Chemistry but here's what I know:
There are small, weak bonds that form between water molecules. These bonds make it so liquid molecules (water, in this example) cannot move as freely as a gas, but their bonds aren't nearly as strong as a solid. The bonds are formed when a hydrogen atom is attracted to an oxygen atom (because they have an opposite charge). This bond plus the gas molecules hitting the water causes surface tension.
(Let me know if this is wrong and I hope you have a lovely day!!)
I have no idea how to do these help me plz
for me the pictures aren't clear
Need help fast!!!!!!!!!!!
ANSWER ASAP please I need help thank you I’ll give you brainly
What is the standard cell notation of a galvanic cell made with silver (Ag) and
nickel (Ni)?
A. Ni2+(aq) | Ni(s) || Ag(s) | Ag+(aq)
B. Agt(aq) | Ag(s) || Ni(s) | Ni2+(aq)
C. Ag(s) | Ag+(aq) || Ni2+(aq) | Ni(s)
D. Ni(s) | Ni2+(aq) || Ag+(aq) | Ag(s)
Answer:
See the attached notation!