Answer:
Hg
Explanation:
Hg is a correct chemical symbol of an element. Therefore, The correct option is option C among all the given options.
What is element?The quantity of protons an element has defines it. An element's atoms all contain the same amount of protons, but its electron and neutron counts might vary. Ions are produced by altering the electron to proton ratio, whereas isotopes are produced by altering the neutron count.
A material that cannot be destroyed chemically is referred to as a chemical element. Although chemical processes cannot modify an atom, nuclear reactions can create new elements. Hg is a correct chemical symbol of an element. A material that is not further decomposed either by chemical reaction is known as a chemical element.
Therefore, Hg is a correct chemical symbol of an element. The correct option is option C among all the given options.
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in this trial, 0.400 M NaOH was added to 40.00 ml of 0.400 M HCl. How many ml of base must be added to cause the colour to change?
Answer:
The amount of Ml that is needed
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Answer:
Explanation:
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For test 6 (150 hevy 50 light particles), what is the pressure contribution from the heavy particles?
Answer:
The pressure contribution from the heavy particles is 17.5 atm
Explanation:
According to Dalton's law of partial pressures, if there is a mixture of gases which do not react chemically together, then the total pressure exerted by the mixture is the sum of the partial pressures of the individual gases that make up the mixture.
In the simulation:
the pressure of the 50 light particles alone was determined to be 5.9 atm, the pressure of the 150 heavy particles alone was measured to be 17.5 atm,
the total pressure of the mixture of 150 heavy and 50 light particles was measured to be 23.4 atm
Total pressure = partial pressure of Heavy particles + partial pressure of light particles
23.4 atm = partial pressure of Heavy particles + 5.9 atm
Partial pressure of Heavy particles = (23.4 - 5.9) atm
Partial pressure of Heavy particles = 17.5 atm
Therefore, the pressure contribution from the heavy particles is 17.5 atm
Calculate the amount of heat in kilojoules required to vaporize 2.58 kg of water at its boiling point.
Answer:
The amount of heat required to vaporize 2.58 kg of water at its boiling point is 5,830.8 kJ.
Explanation:
A substance undergoes a change in temperature when it absorbs or gives up heat to the environment around it. However, when a substance changes phase it absorbs or gives up heat without causing a change in temperature. The heat Q that is necessary for a mass m of a certain substance to change phase is equal to:
Q = m*L
where L is called the latent heat of the substance.
In this case:
m=2.58 kgThe heat of vaporization of water is L=2260*10³ J/kgReplacing:
Q= 2.58 kg* 2260*10³ J/kg
Q= 5,830,800 J = 5,830.8 kJ (Being 1,000 J= 1 kJ)
The amount of heat required to vaporize 2.58 kg of water at its boiling point is 5,830.8 kJ.
The required amount of heat will be "5830 KJ".
Given:
Amount of water,
m = 2.58 kgAs we know,
Latent heat of vaporization,
[tex]L_{vap} = 2260\times 31 \ kg[/tex]Now,
The amount of heat required will be:
= [tex]m\times L_{vap}[/tex]
= [tex]2.58\times 2260[/tex]
= [tex]5830 \ KJ[/tex]
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Which of the following metal ions can potentially form both low-spin and high-spin complexes?
a. Ti2+
b. Cu+
c. Fe2+
d. Ni2+
e. Cr3+
Answer:
c. Fe2+
Explanation:
Coordination compounds comprise solely complex ions together with one or more counter ions. They are compounds in which metal atoms or ions are directly bonded to anions or neutral atoms in conjunction with coordinate covalent bonds.
From the given options, only Fe2+ can form both low-spin and high-spin.
To determine that, we find out the number of unpaired spins in Fe2+
At the ground state:
The electronic configuration is:
Fe: [Ar] 3d⁶ 4s²
After the removal of two electrons, the configuration becomes
Fe²⁺ : [Ar] 3d⁶
A metal ion has the ability to form both low-spin and high-spin complexes if the metal-ion comprises more than 3 and less than 8 d -electrons.
So, since Fe²⁺ contains more than 3 and less than 8. Then Fe²⁺ is the right option.
Ti²⁺ contains only two d electrons
Cu⁺ contains more than eight d electrons
Ni²⁺ contains eight d electrons
Cr³⁺ contains three d electrons
Is the following chemical reaction balanced? 2H2O2 H2O + O2 yes no
The heat of fusion of a compound is 126 Joules
per gram. What is the total number of Joules of
heat that must be absorbed by a 15.0-gram
sample to change the compound from solid to
liquid at its melting point?
Answer:
1.89 × 10³ J
Explanation:
Step 1: Given data
Heat of fusion (ΔH°fus): 126 J/gMass of the sample (m): 15.0 gStep 2: Calculate the heat (Q) required to melt the sample
The fusion is the phase change from solid to liquid. We can calculate the heat required for the fusion of the sample using the following expression.
Q = ΔH°fus × m
Q = 126 J/g × 15.0 g
Q = 1.89 × 10³ J
Describe what happens in the cell before the chemical reaction.
___________________________________________________________
Answer:
Chemical reactions that take place inside living things are called biochemical reactions. The sum of all the biochemical reactions in an organism is referred to as metabolism. Metabolism includes both exothermic (heat-releasing) chemical reactions and endothermic (heat-absorbing) chemical reactions.
___________________________________________________________
3. An atom is electrically neutral, on loss or
jain of electrons why does it become charged?
Answer:
when atom is neutral it has a no charge, looses electron has positive charge, gains electron gets negative charge
Explanation:
protons have positive charges (+)
electrons have negative charges (-)
when an atom is neutral is means no additional electron is lost or gain
When an atom has a neutral charge it has neither too much or too little electrons since it has not gained or lost any thus the zero charge ( no charge)
When an atom loses an electron since its losing an electron that has a negative charge it becomes a bit more positive so thus the positive charge
When the atom gains an electron it gains a bit more negativity then it had so its going to have a negative charge
A compound has a molecular weight of 146 g/mol. A 0.3250 g sample of the compound contains 0.1605 g of carbon, 0.0220 g of hydrogen, and 0.1425 g of sulfur. What is the molecular formula of the compound
Answer: The molecular formula is [tex]C_6H_{10}S_2[/tex]
Explanation:
We are given:
Mass of [tex]C[/tex] = 0.1605 g
Mass of [tex]H[/tex]= 0.0220 g
mass of [tex]S[/tex] = 0.1425 g
Step 1 : convert given masses into moles.
Moles of C =[tex]\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{0.1605g}{12g/mole}=0.0134moles[/tex]
Moles of H =[tex]\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{0.0220g}{1g/mole}=0.0220moles[/tex]
Moles of S =[tex]\frac{\text{ given mass of S}}{\text{ molar mass of S}}= \frac{0.1425g}{32g/mole}=0.0044moles[/tex]
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For C = [tex]\frac{0.0134}{0.0044}=3[/tex]
For H = [tex]\frac{0.0220}{0.0044}=5[/tex]
For S =[tex]\frac{0.0044}{0.0044}=1[/tex]
The ratio of C : H: S= 3: 5: 1
Hence the empirical formula is [tex]C_3H_5S[/tex]
The empirical weight of [tex]C_3H_5S[/tex] = 3(12)+5(1)+1(32)= 73g.
The molecular weight = 146 g/mole
Now we have to calculate the molecular formula.
[tex]n=\frac{\text{Molecular weight }}{\text{Equivalent weight}}=\frac{146}{73}=2[/tex]
The molecular formula will be=[tex]2\times C_3H_5S=C_6H_{10}S_2[/tex]
Four members of a school first eleven cricket team are also members of the first fourteen rugby team How
many boys play for at least one of the two teams?
Select one
a 12
b 22
C. 14
d 21
Answer:
total 11+14 is 25
now 4 are common and counted twice so subtract 4 so answer is 21
100 pts, 4 questions I am having issues answering
17 Explain oxidation using rust as an example
19 What is a solution that cannot dissolve any more solute because it is too concentrated?
26 What two factors contribute to expansion?
32 How are the groups organized in the periodic table? What do all the elements in a group have in common?
Answer:
17. The iron metal is oxidized to form the iron oxide known as rust.
19.A saturated solution will not dissolve any more solute and any extra solute added will simply stay as it is, without dissolving. An unsaturated solution has less solute than its solubility and hence can still add more solute, till it reaches the saturation level.
26 An Overflowing Population. The swelling American population played a large part in the decision Americans made to head, The Government Opens Up New Land. The American government itself encouraged its citizens to move west
32. The periodic table was first assembled in 1869 by a Russian chemist named Dmitri Mendeleev. He came up with a way of organizing the elements that were known at the time, arranged them in order of atomic weight, and then grouped them into rows and columns based on their chemical and physical properties. Here is a unique "Mayan" format Periodic Table. Elements in the same group are those that are in a single vertical line from top to bottom. They have the most in common between the two directions. They share the same number of electrons in their valence subshells.
Explanation:
17. The iron metal is oxidized to form the iron oxide known as rust.
19.A saturated solution will not dissolve any more solute and any extra solute added will simply stay as it is, without dissolving. An unsaturated solution has less solute than its solubility and hence can still add more solute, till it reaches the saturation level.
26 An Overflowing Population. The swelling American population played a large part in the decision Americans made to head, The Government Opens Up New Land. The American government itself encouraged its citizens to move west
32. The periodic table was first assembled in 1869 by a Russian chemist named Dmitri Mendeleev. He came up with a way of organizing the elements that were known at the time, arranged them in order of atomic weight, and then grouped them into rows and columns based on their chemical and physical properties. Here is a unique "Mayan" format Periodic Table. Elements in the same group are those that are in a single vertical line from top to bottom. They have the most in common between the two directions. They share the same number of electrons in their valence subshells.
Measurements also show that a certain sample of the unknown compound contains 6.2 mol of oxygen and 4.1 mol of nitrogen.
Write the complete chemical formula for the unknown compound.
The chemical formula for the unknown compound : N₂O₃
Further explanationGiven
6.2 mol of oxygen and 4.1 mol of nitrogen.
Required
The chemical formula
Solution
Chemical formulas can be expressed in terms of empirical or molecular formulas.
The empirical formula shows the simplest mole ratio of a compound
Meanwhile, the molecular formula shows the actual ratio of the number of elements that make up the compound
We divide the two known moles by the smallest mole (moles of nitrogen)
[tex]\tt N\div O=\dfrac{4.1}{4.1}\div \dfrac{6.2}{4.1}=1\div 1.5=2\div 3[/tex]
Three type of symbiosis
Answer:
mutualism, commensalism, and parasitism.
Question:
Three type of symbiosis
Answer:
Mutualism: both partners benefit. ...
Commensalism: only one species benefits while the other is neither helped nor harmed. ...
Parasitism: One organism (the parasite) gains, while the other (the host) suffers
Little Info.
Symbiosis is a close relationship between two species in which at least one species benefits. For the other species, the relationship may be positive, negative, or neutral. There are three basic types of symbiosis: mutualism, commensalism, and parasitism
strengths as bases:
H2O, F-, Cl-, NO,, and CN-
Answer:
Cl^-<NO3^-<H2O<F^-<CN^-
Explanation:
When we talk about base strength we are referring to how easily a chemical specie accepts protons.
The greater the ability of a specie to accept H^+, the greater its base strength.
The order of increasing base strengths of the species listed are shown in the answer above.
How many moles of magneslum chloride are there in 148 grams of magnesium chloride?
Answer:
1.554442238816872 moles
Explanation:
Answer:
1.5544422388169434
Explanation:
1 mole is equal to 1 moles Magnesium Chloride, or 95.211 grams.
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The pH scale for acids and bases ranges from
A. 17
B. 0-14
C. 1-14
D. 1-12
Answer: 0-14
Explanation: Hope this helps
A change in pH usually produces a change in enzyme activity because:_______.Select one:a. pH of the environment changes the conformation of the enzyme.b. enzyme activity increases at extreme pH values (either acidic or basic).c. enzyme activity is usually least active below its optimum pH.d. enzyme activity is most active above its optimum temperature.
Answer:
c. enzyme activity is usually least active below its optimum pH
Explanation:
Enzyme activity depends highly on pH. Enzymes are biological molecules which are proteins and influence the rates of important biochemical reactions in the human body.
Enzymes has a value of pH at which it works most perfectly. This pH value is known as its optimum pH. Above or below this value, the enzyme does not function optimally.
Hence, a change in pH usually produces a change in enzyme activity because enzyme activity is usually least active below its optimum pH
Which of the following energy resources provides non-recyclable energy and is also the least polluting?
a) Biomass energy
b) Nuclear power
c) Hydropower
d) Natural gas
Answer:
b) Nuclear power
Explanation:
The nuclear power plant generated the nuclear energy that utilize the radio active materials like uranium i.e. finite. Thus, this is a non-recyclable.
Also this energy does not release any type of polluting gas neither it is harmful like carbon dioxide or any green house gases So it would be least polluting
Therefore as per the given statement, the option b is the correct one
Answer:
b) Nuclear power
Explanation:
took the test :)
How many moles of water are present in 55.1 g of H2O
Answer:
3.0585147719047385 is the answer
if you start with 362 grams of C3 H8 how many grams of H2O will be produced
Answer:
52 g H2O (to 2 significant figures)
Explanation:
I hope you like my answer:)
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In the NCl3 molecules there are banded pairs of electrons and nonbonded pairs of electrons attached to central atom?
Answer: the anwser is a. cuz i did it so im smart and u should listen to me
Explanation:non>
What was a result of the Zhou capital being destroyed by invaders?
A) Leaders of the feudal states declared independence.
B) Loyal relatives supported the king to protect the empire.
C) Feudal rulers began to use nomadic soldiers in their armies.
D) Philosophers gained power by encouraging citizens to rebel.
Answer:
A
Explanation:
Answer:
think it is D
Explanation:
hope this helps
In the event that a chemical gets in your eye while in the lab, you would use the eyewash station. In your at-home lab, however, which of these courses of action (according to your lab procedure)could be used in lieu of an eye wash station?A. Using Visene, contact solution, or a similar eye drop immediatelyB. Using the sprayer on your sink if you have oneC. Pouring milk in your eye(s)D. A vigorous 30-second eye rub
Answer:
Using the sprayer on your sink if you have one
Explanation:
If a chemical gets into your eye, you will need to flush the eye thoroughly with water in order to get the chemical out of the eye before it causes any kind of damage to the eye.
This could normally be done in an eye wash station. However in the absence of an eye wash station, one could use the sprayer of the sink if he/she has one. This will deliver water to completely flush the eye at lower pressure.
If the decomposition of a sample of KClO3 produces 3.29 g of O2. What was the mass (g) of the original sample?
Answer: 8.41 g
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} O_2=\frac{3.29g}{32g/mol}=0.103moles[/tex]
The balanced chemical equation for decomposition is :
[tex]2KClO_3\rightarrow 2KCl+3O_2[/tex]
According to stoichiometry :
As 3 moles of [tex]O_2[/tex] are produced by = 2 moles of [tex]KClO_3[/tex]
Thus 0.103 moles of [tex]O_2[/tex] are produced by =[tex]\frac{2}{3}\times 0.103=0.0687moles[/tex] of [tex]KClO_3[/tex]
Mass of [tex]KClO_3=moles\times {\text {Molar mass}}=0.0687moles\times 122.5g/mol=8.41g[/tex]
8.41 g was the mass of the original sample.
For the reaction represented by the equation 2h+O2– 2H2O, how may grams of water are produced from 6.00 mol of hydrogen?
Atomic mass of hyorogen = 1.0gmol
Atomic mass of oxygen = 16.0 omo
Answer:
Mass = 108 g
Explanation:
Given data:
Mass of water produced = ?
Number of moles of hydrogen = 6.00 mol
Solution:
Chemical equation:
2H₂ + O₂ → 2H₂O
Now we will compare the moles of hydrogen with water.
H₂ : H₂O
2 : 2
6 : 6
Mass of water:
Mass = number of moles × molar mass
Mass = 6 mol × 18 g/mol
Mass = 108 g
A particular first-order reaction has a rate constant of 1.35 × 10^2 s−1 at 25.0 ∘C. What is the magnitude of k at 65.0∘C if Ea = 55.5 kJ/mol.
The magnitude of k at 65.0∘C : 1912.7 /s
Further explanationGiven
k at 25 °C = 1.35 x 10² /s k1
T₁=25 + 273 = 298 K
T₂=65 + 273 = 338 K
Required
the magnitude of k at 65.0∘C
Solution
Arrhenius Equation :
[tex]\tt ln(\dfrac{k_1}{k_2})=(\dfrac{1}{T_2}-\dfrac{1}{T_1})\dfrac{Ea}{R}[/tex]
R : gas constant= 8.314 J/molK
Input the value :
[tex]\tt ln(\dfrac{1.35\times 10^2}{k_2})=(\dfrac{1}{338}-\dfrac{1}{298})\dfrac{55.5.10^3}{8.314}\\\\ln(\dfrac{135}{k_2})=-2.651\rightarrow \dfrac{135}{k_2}=e^{-2.651}\rightarrow k_2=1912.7[/tex]
Temperature,
[tex]T_1 = 25^{\circ} C[/tex] or, [tex]298 \ K[/tex][tex]T_2 = 65^{\circ} C[/tex] or, [tex]338 \ K[/tex]Rate constant,
[tex]1.35\times 10^2 \ s^{-1}[/tex]Gas constant,
[tex]R = 8.314 \ J/mol[/tex]By using the Arrhenius equation, we get
→ [tex]ln (\frac{k_1}{k_2} ) = (\frac{1}{T_2} - \frac{1}{T_1} )\frac{Ea}{R}[/tex]
By substituting the values, we get
→ [tex]ln (\frac{1.35\times 10^2}{k_2} ) = (\frac{1}{338} - \frac{1}{298} )\frac{55.5\times 10^3}{8.314}[/tex]
→ [tex]ln (\frac{135}{k_2} ) = -2.651[/tex]
[tex]\frac{135}{k_2} = e^{-2.651}[/tex]
[tex]k_2 = 1912.7[/tex]
Thus the response above is right.
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what is the modification of the small intestinal wall that serves to increase surface area?
Answer:
Villi
Explanation:
Villi are folds on the small intestine lining that increase the surface area to facilitate the absorption of nutrients.
The modification of the small intestinal wall that serves to increase surface area is called the microvilli.
What is meant by villi ?Along the length of your small intestine, there are minute, finger-like extensions called intestinal villi comprised of cells.
Here,
Villi are projections that are finger-like and are densely populated with blood vessels. They are found in the inner lining of the small intestine and aid in nutrient absorption by expanding the surface area for absorption.
When we consume food, nutrients are taken up by our villi, which subsequently transport them into our bloodstream to be transported to where they are needed.
Digestive enzymes are present in the microvilli, which aid in the breakdown of proteins and carbohydrates. Villi aid in nutrient absorption in this manner.
Hence,
The modification of the small intestinal wall that serves to increase surface area is called the microvilli.
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what happens to energy when sally kicks a soccor ball
Answer:
it is turned into kinetic energy
Explanation:
Answer:
Kinetic energy is transferred from the leg to the soccer ball. or C
Explanation:
Hope this helps
Which set of atoms have 3 valence electrons?
carbon, silicon, and germanium
O beryllium, magnesium, and calcium
O hydrogen, lithium, and sodium
O boron, aluminum, and gallium
Answer:
boron, aluminum, and gallium
Explanation:
They are in group 3A on the periodic table which means they have 3 valence electrons