Is NaCI a compound, atom, molecule, or element?
Answer:
Compound.
Explanation:
NaCl, or sodium chloride, is an ionic compound that is formed from the element Sodium (Na) and Chlorine (Cl). It is commonly known as salt.
How much would it cost to buy nails that will be used to build a fence 125 meters long if it requires
30 nails per meter? Assume that 40 nails are sold per box at a cost of P10.75 per box.
Answer:
Total cost = 1007.80 (Approx)
Explanation:
Given:
Length of fence = 125 m
Require = 30 nails per meter
40 nails cost = 10.75
Find:
Total cost
Computation:
Total nails require = 125 x 30
Total nails require = 3750
Total cost = 1007.80 (Approx)
What does this equation describe?
AE = Ehigher energy level - Elower energy level
A.
the change in an atom's energy that occurs when electrons are captured by an outer energy level
OB
the change in an atom's energy that occurs when the nucleus gains protons or neutrons
C.
the energy of a photon emitted by an electron dropping from an excited energy state
D.
the energy of an electron emitted by an atom dropping from an excited energy state
Reset
Next
Answer:
the energy of photons emitted by electron dropping from an excited energy state
How much is a share in namsek worth as a percent of a share in oxd group
Answer:
10% is a share in NAMSEK worth as a percentage of a share in ODX Group Inc., in year 4
EXPLANATION: give brainliestThe share of NAMSEK in year 4 is around $ shares (as given from the above table). Hence the value of one share will be $2.5/share
The share of ODX Group Inc., in year 4 is around $ shares (as given from the above table). Hence the value of one share is $
Therefore a share in NAMSEK worth as a percentage of a share in ODX Group Inc., in year 4 will be
= 0.1 or 10 %
can we cover the earth with one mole of pennies? Explain.
Answer:
No we can’t cover the earth with one mole of pennies
Explanation:
We can’t cover the earth with one mole of pennies due to the fact that making this possible will require the flattening and extra expansion before it covers the whole surface.
The extra expansion and flattening with result in the loss of intermolecular forces and won’t remain as a solid and form other states of matter which won’t be able to cover the surface.
The SN1 reaction yields Entry field with incorrect answer two (number) products. This is because ______________________. Entry field with incorrect answer The carbocation that forms can react with CH3OH from the top side of the molecule. The carbocation that forms can react with H2O from either the top or bottom side of the molecule. The carbocation that forms can react with either nucleophile (H2O or CH3OH) from the top side of the molecule. The carbocation that forms can react with H2O from the bottom side of the molecule. The carbocation that forms can react with CH3OH from either the top or bottom side of the molecule. The carbocation that forms can react with either nucleophile (H2O or CH3OH) from the bottom side of the molecule. The carbocation that forms can react with H2O from the top side of the molecule. The carbocation that forms can react with CH3OH from the bottom side of the molecule. The carbocation that forms can react with either nucleophile (H2O or CH3OH) from either the top or bottom side of the molecule.
Answer:
Four substitution products are obtained. The carbocation that forms can react with either nucleophile (H2O or CH3OH) from either the top or bottom side of the molecule
Explanation:
An SN1 reaction usually involves the formation of a carbocation in the slow rate determining step. This carbocation is now attacked by a nucleophile in a subsequent fast step to give the desired product.
However, the product is obtained as a racemic mixture because the nucleophile may attack from the top or bottom of the carbocation hence both attacks are equally probable.
The attacking nucleophile in this case may be water or CH3OH
Which ecosystem would be least affected? I already know its a or b but i dont know which one help me and ill give a high points
Answer:
the answer is a . trust me
please help me it’s due today
Answer:
Opinion A is the right answerAnswer:
it's A
Hope this helps
amnabsbshdbxbsbsj
which list of elements consists of a metal, a metalloid, and a nonmetal?
Answer:
Sn, Si, C
Explanation:
The periodic table consists of metals, non-metals and non-metalloids. The classification of the elements is mainly based on the chemical properties which are common among them. Here the correct option is A.
What are metals, non-metals and metalloids?The elements which tend to lose electrons easily and are located on the left side of the periodic table are called metals. They are good conductors of heat and electricity. All metals are malleable, ductile and shows metallic lustre.
The elements which tend to gain electrons and are placed on the right side of the periodic table are called non-metals. Most of them are brittle and are not malleable or ductile. They have low melting and boiling points.
The elements which exhibit the properties of metals and non-metals are called metalloids. These elements are placed diagonally across the periodic table. They form alloys with metals.
Here among the given list of elements, Na, Si and O consists of metal, non-metal and metalloid.
Thus the correct option is A.
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Your question is incomplete, but most probably your full question was
which list of elements consists of a metal, a metalloid, and a nonmetal?
A. Na, Si, O
B. Ge, Si, Cl
C. He, N, F
D. None of the above
According to the following balanced reaction, how many moles of HNO3 are formed from 8.61 moles of NO2 if there is plenty of water present?
3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)
Answer:
According to the following balanced reaction, how many moles of HNO3 are formed from 8.61 moles of NO2 if there is plenty of water present?
Explanation:
According to the following balanced reaction, how many moles of HNO3 are formed from 8.61 moles of NO2 if there is plenty of water present?
1. Isotopes of the same element vary in
the number of
present in the
nucleus.
A.neutrons
B.protons
C.electrons
Neutrons as protons determine the element
What is thermodynamics?
A. The study of the conservation of matter and energy
B. The study of the movement of energy and heat
C. The study of kinetic energy and potential energy
D. The study of the transfer of hot and cold energy
Answer:
The answer to your question is B
Thermodynamics is the study of science that deals with the relation and movement of heat, work, temperature, and energy. Thus, option B is correct.
What are the laws of thermodynamics?Thermodynamics is the science that deals with the relation and the flow of heat and energy concerning entropy and enthalpy of matter. According to the laws of thermodynamics, the energy or the heat of the substances or the system cannot be formed through new reactions nor they can be destroyed.
The second law states about the spontaneous and non-spontaneous reactions and their relation to entropy and enthalpy of the reaction. In the third law, for a pure substance, the entropy reaches zero with the temperature also approaching zero.
Therefore, thermodynamics deals with the flow of heat and energy.
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Manganese (Mn) is a transition element essential for
the growth of bones. What is the mass (g) of 3.22 x 1020 Mn atoms, the number
found in 1 kg of bone? Include a road map that shows how you planned your
solution
Given parameters:
Number of atoms of Mn = 3.22 x 10²²atoms
Mass of the bone = 1kg
Unknown:
Mass of Mn = ?
To solve this problem:
Road map
Understand the relationship between number of moles, mass, molecular mass and number of particles. Solve for the number of moles using the number of atoms given. Using the number of moles find the mass of the unknown. Understand the relationship between number of moles, mass, molecular mass and number of particles.The number of moles is the amount of a substance that contains the Avogadro's number of particles 6.02 x 10²³
Molecular mass is the mass in grams of one mole of the substance.
Number of particles are elementary particles such as atoms, molecules, formula units, ions, electrons, protons, neutrons e.t.c
Number of moles = [tex]\frac{number of particles}{6.02 x 10^{23} }[/tex]
Mass = number of moles x molecular mass
Solve for the number of moles using the number of atoms given.Input parameters,
number of particles = Number of moles of Mn = [tex]\frac{number of particles}{6.02 x 10^{23} }[/tex]
Number of moles of Mn = [tex]\frac{3.22 x 10^{20} }{6.02 x 10^{23} }[/tex] = 0.53 x [tex]10^{-3}[/tex]moles
Using the number of moles find the mass of the unknown.To find the unknown mass, we need to know the molecular mass of Mn. This value is found on the periodic table and it is 55g/mol
So, mass of Mn = number of moles of Mn x molecular mass of Mn
= [tex]0.53 x 10^{-3}[/tex] x 55
= 0.029g
Mass of Mn contain in 1kg of bone is 0.029g
The mass (g) that should be found in 1 kg of bone is 0.029g.
Road mapHere we understand the relationship between a number of moles, mass, molecular mass, and a number of particles. Now Solve for the number of moles by using the number of atoms given. And, Using the number of moles we determine the mass of the unknown. Finally, understand the relationship between the number of moles, mass, molecular mass, and a number of particles.
Relationship of no of moles, molecular mass, and no of particles:The number of moles should be the amount of a substance that comprise of the Avogadro's number of particles 6.02 x 10²³. Molecular mass represent the mass in grams of one mole of the substance. And, the number of particles should be elementary particles like atoms, molecules, formula units,etc.
We know that
Mass = number of moles x molecular mass
So,
The number of moles should be [tex]= 3.22x10^{23} \div 6.02x10^{23}[/tex]
= [tex]0.53 \times 10^{-3}[/tex] moles
Now
Mass of mn should be
= number of moles of Mn x molecular mass of Mn
= [tex]0.53 \times 10^{-3} \times 55[/tex]
= 0.029g.
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Examine the layers of rock. Identify and explain which layer contains the oldest fossils? Earth layers with fossiles in each labeled top to bottom A to D.
I need a paragraph
Answer:The answer is D i got this answer because, the oldest layers are at te bottom and the youngest layers are on the top.
hope this answer heps!
Draw the Lewis structure for XeCl2 and answer the following questions.
How many valence electrons are present in this compound?
How many bonding electrons are present in this compound?
How many lone pair (non-bonding) electrons are present in this compound?
Answer:
Valence electrons in XeCl2 = 8 + 7 + 7 = 22.
Bonding electrons = 4.
Nonbonding electrons = 18.
Explanation:
Hello.
In this case, you can see the Lewis structure on the attached picture, in which you can see that there are since xenon has 8 valance electrons and each chlorine has 7 valence electrons, the total amount of valence electrons is:
Valence electrons in XeCl2 = 8 + 7 + 7 = 22.
Moreover, since each chlorine atom is bonding with one of the eight electrons of xenon (Lewis structure), we can see there are 4 bonding electrons.
Finally, since there are six nonbonding electrons per chlorine atom and six nonbonding electrons in xenon, the overall nonbonding electrons are:
Nonbonding electrons in XeCl2 = 6 + 6 + 6 = 18.
Regards.
Determine whether each description applies to electrophilic aromatic substitution or nucleophilic aromatic substitution.
a. The position of the added group is mostly determined by electronics.
b. The aromatic ring is the electrophile and the added group is the nucleophile.
c. The position of the added group is mostly determined by the location of a leaving group.
d. Electron donating groups on the aromatic group increase reactivity.
e. Electron withdrawing groups on the aromatic group increase reactivity.
f. The aromatic ring is the nucleophile and the added group is the electrophile. Choose...
Answer:
a. electrophilic aromatic substitution
b. nucleophilic aromatic substitution
c. nucleophilic aromatic substitution
d. electrophilic aromatic substitution
e. nucleophilic aromatic substitution
f. electrophilic aromatic substitution
Explanation:
Electrophilic aromatic substitution is a type of chemical reaction where a hydrogen atom or a functional group that is attached to the aromatic ring is replaced by an electrophile. Electrophilic aromatic substitutions can be classified into five classes: 1-Halogenation: is the replacement of one or more hydrogen (H) atoms in an organic compound by a halogen such as, for example, bromine (bromination), chlorine (chlorination), etc; 2- Nitration: the replacement of H with a nitrate group (NO2); 3-Sulfonation: the replacement of H with a bisulfite (SO3H); 4-Friedel-CraftsAlkylation: the replacement of H with an alkyl group (R), and 5-Friedel-Crafts Acylation: the replacement of H with an acyl group (RCO). For example, the Benzene undergoes electrophilic substitution to produce a wide range of chemical compounds (chlorobenzene, nitrobenzene, benzene sulfonic acid, etc).
A nucleophilic aromatic substitution is a type of chemical reaction where an electron-rich nucleophile displaces a leaving group (for example, a halide on the aromatic ring). There are six types of nucleophilic substitution mechanisms: 1-the SNAr (addition-elimination) mechanism, whose name is due to the Hughes-Ingold symbol ''SN' and a unimolecular mechanism; 2-the SN1 reaction that produces diazonium salts 3-the benzyne mechanism that produce highly reactive species (including benzyne) derived from the aromatic ring by the replacement of two substituents; 4-the free radical SRN1 mechanism where a substituent on the aromatic ring is displaced by a nucleophile with the formation of intermediary free radical species; 5-the ANRORC (Addition of the Nucleophile, Ring Opening, and Ring Closure) mechanism, involved in reactions of metal amide nucleophiles and substituted pyrimidines; and 6-the Vicarious nucleophilic substitution, where a nucleophile displaces an H atom on the aromatic ring but without leaving groups (such as, for example, halogen substituents).
What results in the change of velocity?
Answer: An object can change velocity in a number of ways: it can slow down, it can speed up, or it can change direction. A change in speed, or a change in direction, or a change in both speed and direction means that the object has a change in velocity.
Explanation:
A balloon contains 25.0 grams helium (He) gas at room temperature (22 °C) and occupies a volume
of 75.0 L. How much pressure does the He gas exert on the walls of the balloon?
Answer:
The pressure exerted by He on walls of balloon is 2.02 atm.
Explanation:
Given data:
Mass of helium = 25.0 g
Temperature = 22°C
Volume of gas = 75.0 L
Pressure exert by the gas on walls of balloon = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
22+273 = 295 K
Now we will calculate the number of moles of He.
Number of moles = mass/ molar mass
Number of moles = 25 g/ 4 g/mol
Number of moles = 6.25 mol
Now we will put the values in formula.
P × 75.0 L = 6.25 mol × 0.0821 atm.L/mol.K ×295 K
P × 75.0 L = 151.372 atm.L
P = 151.372 atm.L / 75.0 L
P = 2.02 atm
The pressure exerted by He on walls of balloon is 2.02 atm.
The spongy layer of a leaf
HELLPROPRPTPR
How many centimeters is 4.25 yards equal to?
Answer:
388.62
Explanation:
well you convert yards into feet and feet into inches and inches into centimeters
How many ounces are in 23.0 tons
Which of the following phase changes occur at point B on the phase diagram below? Choose all that apply.
Condensation
Melting
Boiling
Sublimation
Pls find my answer bellow
You are eating a pizza. What type of mixture are you consuming?
Answer:
heterogeneous mixture
Explanation:
because pizza has different phases I think
The type of mixture that pizza can be classified is Heterogeneous mixture
Heterogeneous mixture can be regarded as a type of mixture that has it's composition not uniform throughout the entire mixture.Heterogeneous mixture is usually comprised of two or more , instance of this is combination of oil and water.A pizza can be considered as heterogeneous mixture, this is because it doesn't appear as non-uniform substance, it's composition the same at all point in the mixture.The components that made of pizza can be separated by use of physical means.Therefore, heterogeneous mixture can be regarded as one having more than a substance.
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6. The Grand Canyon is ______.
A. land surrounded by water
B. a dry, sandy area with no trees
C. a flat topped hill
D. a deep, narrow valley with steep sides
7. The large shapes of land that make up the earth are all called
______.
A. peninsulas
B. landforms
C. waterways
D. mountains
Answer:
6) D
7)A
Explanation:
When solving a problem it is important to identify your given and needed units, but it is also important to understand the relationship between those units so you will know how to set up your equation in order to solve the problem. Review the data sets below and use the steps of the problem-solving method to determine whether the given measurements would be appropriate for calculating mass, volume, or density.
a. 432 g of table salt occupies 20.0 cm^3 of space
b. 5.00 g 0T balsa wood, density of balsa wood : 0.16 g/cm^3
c. 32 cm^3 sample of gold density of gold 19.3 =g/cm^3
d. 150 g of iron, density of Iron = 79.0 g/cm^3
Answer:
See Explanation
Explanation:
Given
(a) to (d)
Required
Determine whether the given parameters can calculate the required parameter
To calculate either Density, Mass or Volume, we have
[tex]Density = \frac{Mass}{Volume}[/tex]
[tex]Mass = Density * Volume[/tex]
[tex]Volume = \frac{Mass}{Density}[/tex]
(a) 432 g of table salt occupies 20.0 cm^3 of space
Here, we have:
[tex]Mass = 432g[/tex]
[tex]Volume = 20.0cm^3[/tex]
The above can be used to calculate Density as follows;
[tex]Density = \frac{Mass}{Volume}[/tex]
[tex]Density = \frac{432g}{20.0cm^3}[/tex]
[tex]Density = 21.6g/cm^3[/tex]
(b) 5.00 g of balsa wood, density of balsa wood : 0.16 g/cm^3
Here, we have:
[tex]Mass = 5.00g[/tex]
[tex]Density = 0.16g/cm^3[/tex]
This can be used to solve for Volume as follows:
[tex]Volume = \frac{Mass}{Density}[/tex]
[tex]Volume = \frac{5.00g}{0.16g/cm^3}[/tex]
[tex]Volume = 31.25cm^3[/tex]
(c) 32 cm^3 sample of gold density of 19.3 g/cm^3
Here, we have:
[tex]Volume = 32cm^3[/tex]
[tex]Density = 19.3g/cm^3[/tex]
This can be used to calculate Mass as follows:
[tex]Mass = Density * Volume[/tex]
[tex]Mass = 32cm^3 * 19.3g/cm^3[/tex]
[tex]Mass = 617.6g[/tex]
(d) 150 g of iron, density of Iron = 79.0 g/cm^3
Here, we have
[tex]Mass = 150g[/tex]
[tex]Density = 79.0g/cm^3[/tex]
This can be used to calculate volume as follows:
[tex]Volume = \frac{Mass}{Density}[/tex]
[tex]Volume = \frac{150g}{79.0g/cm^3}[/tex]
[tex]Volume = 1.90 cm^3[/tex] Approximated
A particular element exists in two stable isotopic forms. One isotope has a mass of 78.9183 amu (50.69% abundance). The other isotope has a mass of 80.9163 amu (49.31% abundance). Calculate the average mass of the element and determine its identity.
Answer:
Average atomic mass = 79.9035 amu.
The given element is bromine.
Explanation:
Given data:
Mass of 1st isotope = 78.9183 amu
Percent abundance of 1st isotope = 50.69%
Mass of 2nd isotope = 80.9163 amu
Percent abundance of 1st isotope = 49.31%
Average atomic mass = ?
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (50.69×78.9183 )+(49.31× 80.9163) /100
Average atomic mass = 4000.3686+ 3989.9828 / 100
Average atomic mass = 7990.3514 / 100
Average atomic mass = 79.9035 amu.
The given element is bromine.
What is the name for CrN:
Answer:
Chromium Nitride
Explanation:
A chemical change is the change in _____ substance
Explanation:
A chemical change is the change in liquid substance
Hope it will help you
The meaning of the word symptom:
The word "symptom" refers to a specific manifestation or indication of a condition, disease, or disorder that is experienced or observed by an individual.
Symptoms are subjective or objective changes in the body's normal functioning that may be recognized as abnormal, uncomfortable, or problematic. Symptoms can manifest in various ways depending on the nature of the underlying condition. They can be physical, such as pain, rash, cough, fever, or fatigue, indicating an illness or injury affecting the body. Symptoms can also be psychological, such as anxiety, depression, or confusion, reflecting disturbances in mental health.
Symptoms serve as important clues for medical professionals to identify and diagnose diseases or disorders. They provide valuable information about the nature, severity, and progression of an illness, helping healthcare providers formulate appropriate treatment plans. Additionally, symptoms may also be important for individuals to self-assess their own health status and seek appropriate medical attention.
It is essential to note that symptoms alone may not provide a definitive diagnosis, as they can overlap across different conditions. Further evaluation, including medical tests and examinations, is often necessary to confirm a diagnosis and determine the appropriate course of action.
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balance the redox reaction: NO+Fe2+—>NO2- +Fe
20.0 g of NO are reacted with 31.4 g of Fe2+. Calculate the mass of Fe that is optimal and the remaining grams of excess reactant
The remaining grams of excess reactants NO is 0.68 g.
To balance the given redox reaction NO+Fe2+—>NO2- +Fe2+ we can follow the half-reaction method. Let's first write the unbalanced reaction:Fe2+ + NO → Fe3+ + NO2-Break down the reaction into two half-reactions:Fe2+ → Fe3+NO → NO2-The balanced half-reactions are:Fe2+ → Fe3+ + e- (multiply by 1)NO + H2O → NO2- + 2 H+ + e- (multiply by 2)The number of electrons lost in the oxidation half-reaction must be equal to the number of electrons gained in the reduction half-reaction. To balance the electrons, we multiply the oxidation half-reaction by 2:2 Fe2+ → 2 Fe3+ + 2 e-Balance the overall reaction by multiplying the reduction half-reaction by 2:2 NO + 2 H2O → 2 NO2- + 4 H+ + 2 e-The final balanced equation is:2 Fe2+ + 2 NO → 2 Fe3+ + 2 NO2-Now, let's calculate the mass of Fe that is optimal and the remaining grams of excess reactant. We are given that 20.0 g of NO are reacted with 31.4 g of Fe2+.The balanced equation shows that 2 moles of Fe2+ react with 2 moles of NO, which means the mole ratio is 1:1. Using the molar mass of Fe2+, we can convert the given mass of Fe2+ into moles:31.4 g Fe2+ x (1 mol Fe2+ / 55.845 g) = 0.561 mol Fe2+According to the balanced equation, 1 mole of Fe2+ reacts with 1 mole of NO. Therefore, 0.561 mol of NO must react with 0.561 mol of Fe2+. Using the molar mass of NO, we can convert the given mass of NO into moles:20.0 g NO x (1 mol NO / 30.01 g) = 0.666 mol NOWe have more moles of NO than the stoichiometrically required amount, which means NO is the excess reactant. To find the amount of Fe2+ that is optimal, we need to calculate the moles of Fe2+ required to react with 0.666 mol of NO:0.666 mol NO x (1 mol Fe2+ / 1 mol NO) = 0.666 mol Fe2+Therefore, the mass of Fe2+ that is optimal is:0.666 mol Fe2+ x 55.845 g/mol = 37.25 g Fe2+To find the remaining grams of excess NO, we subtract the amount of NO that reacted from the initial amount of NO:20.0 g NO - (0.666 mol NO x 30.01 g/mol) = 0.68 g NO.
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