Answer:
B. calcium has electrons in more energy levels than magnesium
Explanation:
atoms are made of three types of subatomic particles - electrons, protons and neutrons.
Neutrons and protons reside in the nucleus of the atom and electrons reside in energy shells
electronic configuration for both Ca and Mg are as follows
Mg - 2,8,2
Ca - 2,8,8,2
outermost energy shell of Mg with electrons is the third energy level
whereas outermost energy shell of Ca with electrons is the fourth energy shell
therefore Ca has a larger atomic radius than Mg as it has one more energy shell than Mg in which electrons reside
The statement that best explains why calcium has a larger atomic radius than magnesium is Calcium's third energy level contains more electrons than magnesium. Option D
Which statement best explains why calcium has a larger atomic radius than magnesium?Atomic radius means how far away the outermost electron shell of an atom is from its nucleus. In the periodic table, the size of an atom usually gets bigger when you go down a group and gets smaller when you go across a row.
In this situation, calcium (Ca) and magnesium (Mg) are in the same group (Group 2) on the periodic table. This group is also called the alkaline earth metals. As you go down this group, the size of the atoms gets bigger. This trend happens because each next element has one more energy level than the element above it.
Calcium has one more energy level than magnesium because it is below magnesium in the same group. The extra energy level in calcium makes its outermost electrons further away from the nucleus compared to the electrons in magnesium. This means that calcium is bigger than magnesium.
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Multichoice
When a double displacement reaction takes place, one of the products must be _____.
1. a salt
2. a gas
3. a precipitate
4. water
Answer: The correct answer is Option 1.
Explanation:
A double displacement reaction is defined as the reaction in which exchange of ions takes place. The general equation for the reaction follows:
[tex]AB+CD\rightarrow AD+CB[/tex]
During this reaction, one of the product formed is always a salt.
A gas is formed in a single displacement reaction and not in double displacement reaction.
A precipitate is formed in some of the double displacement reaction.
Water is formed in neutralization reaction when an acid reacts with a base to produce a salt and water.
Hence, the correct answer is Option 1.
Answer:
a salt
Explanation:
How is the hydrosphere and the geosphere alike
Only the _____ word in an organism's complete scientific name has its first letter capitalized
Answer:
it's first I don't know why that dude has such a low rating I got it correct from his/her answer.
Explanation:
Which of the following statements about Bohr's model of the atom is true? Bohr's model explains the chemical behavior of all atoms.
Bohr’s model does not take into account the interactions multiple electrons would have with one another.
Bohr's model explains the spectra of atoms with more than one electron.
Bohr's model takes into account the interactions multiple electrons would have with one another.
I believe the answer is "Bohr's model explains the chemical behavior of all atoms."
A ball roliling straight until bradley kicks it which of newtons law is it
How many liters of water vapor can be produced if 8.9 liters of methane gas (CH4) are combusted, if all measurements are taken at the same temperature and pressure? Show all of the work used to solve this problem. CH4 (g) + 2O2 (g) yields CO2 (g) + 2H2O (g)
The normal condition of the mole of a gas is 22.44L.
The volume of CH4 = 8.9L
To get the number of moles we get,
8.9 / 22.44 = 0.397 moles.
The ratio of CH4 : H2O = 1: 2
The mole of water is 0.379 × 2 = 0.794 moles.
While we convert it into liters it will be
0.794 × 22.414 = 17.80L
The answer is 17.80 liters of water vapour which will be produced.
Which statement best explains why calcium has a larger atomic radius than magnesium?
A.
Calcium has a stronger nuclear charge than magnesium.
B.
Calcium has electrons in more energy levels than magnesium.
C.
Calcium has more neutrons than magnesium.
D.
Calcium’s third energy level contains more electrons than magnesium’s.
Electron shielding effects reduces the effect of a full nuclear charge. As more of the core electrons are added, they begin to 'shield' the valence electrons from the increasingly positive nucleus. But this will allow the outer electrons to move farther away from the nucleus, hence increasing atomic size. The electron shielding effect is responsible for the increase in atomic size moving down groups.
B. Calcium has electrons in more energy levels than magnesium.
B. Calcium has electrons in more energy levels than magnesium.
If a subject is changing from a vapor to a liquid, like steam on a mirror, it is said to be ---------- ?
condensation
Explanation:Condensation is the change of water from its gaseous form (water vapor) into liquid water. Condensation generally occurs in the atmosphere when warm air rises, cools and looses its capacity to hold water vapor. As a result, excess water vapor condenses to form cloud droplets.
Condensation is the reverse of vaporization.
Answer:
Condensing...
Explanation:
The 4 water cycles, evaporation, condensation, precipitation and collection, are what is happening here...... at least one of them. Condensation is when "water which collects as droplets on a cold surface when humid air is in contact with it" as defined in the dictionary or in this case, when a subject is changing from a vapor to a liquid. I hope this helps!
A. List three things that your body strives to keep constant. (example metabolism)
B. Describe one way in which each of the items you listed in Part A could be at least temporarily disrupted from equilibrium. Can you think of a way your body could respond to restore homeostasis after one of these disruptions?
Final answer:
Homeostasis is the process by which the body maintains constant conditions. The body strives to keep temperature, blood glucose level, and blood pH constant. Disruptions to these can be countered by physiological responses to restore equilibrium.
Explanation:
Homeostasis is the process by which the body strives to maintain constant conditions. Three things that the body strives to keep constant are temperature, blood glucose level, and blood pH.
Temperature can be disrupted from equilibrium when the body is exposed to cold or hot temperatures. In response, the body can constrict blood vessels and shiver to generate heat or sweat and dilate blood vessels to cool down.
Blood glucose level can be disrupted when it rises after a meal. The body responds by releasing insulin, which helps lower blood glucose levels by facilitating the uptake of glucose by cells or storing glucose as glycogen in the liver.
Lastly, blood pH can be disrupted by an increase or decrease in acidity. The body can respond by adjusting the breathing rate to eliminate excess carbon dioxide or increasing the production of bicarbonate ions in the kidneys to restore pH balance.
OFFERING 99 POINTS AND BRAINLIEST TO BEST ANSWER!!!
How many valence electrons are in an atom with the electron configuration in example A? Example A: 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 4p^2
A. 22
B. 2
C. 4
D. 6
The x number in ^x indicates the number of electronics in an obit, e.g. 1s^2 means there are 2 electrons in the 1s orbit.
Total number of electrons in A = 2 + 2 + 6 +2 + 6 + 2 + 2
= 22
VALENCE electrons are those in the outer most shell.
In A, there are 4s^2 + 4p^2: 2 + 2 = 4
Answer should be C instead. So sorry for the mistake earlier!
Example A: 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 4p^2
counting e-: 2 2 6 2 6 2 2
2+2+6+2+6+2+2 = 22
ans is A. 22
Which phosphate in this tetranucleotide would be radioactive? Note that the phosphates are numbered 1-4 in red from top to bottom?
The phosphodiester bonds contains a sugar attached to a phosphate group. Since one outermost phosphate is used to form a phosphate bond everytime, from a precursor containing innermost radiolabelled phosphate, the third phosphate groups will be radioactive in nature. So correct answer is 3.
Hope that helps!
WHO IS GOOOD IN CHEMISTRY
HELP
ITS HARD
AS HELL
THX
HOMIE JUST TRY DONT HAVE TO ANSWER
Sorry for the delay, here's the Lewis Dot Structure of Chloramine
The Lewis structure for chloramine (NH2CI) is complete with all atoms having full octets and a total of 26 valence electrons used.
To complete the Lewis structure for chloramine (NH2CI), follow these steps:
Step 1: Determine the total number of valence electrons in the molecule.
Nitrogen (N) has 5 valence electrons.
Hydrogen (H) has 1 valence electron, but there are 2 hydrogen atoms, so we have 2 valence electrons.
Chlorine (Cl) has 7 valence electrons.
Total valence electrons = 5 (N) + 2 (H) + 7 (Cl) = 14 valence electrons.
Step 2: Connect the atoms with single bonds.
Place the nitrogen (N) in the center, and the hydrogen (H) and chlorine (Cl) atoms around it. Connect each atom to the nitrogen atom with a single bond.
H
N -- C -- Cl
/
H
Step 3: Distribute the remaining valence electrons to complete the octet of each atom.
Start by placing the remaining electrons around the hydrogen and chlorine atoms since they only need 2 electrons to complete their outer shells (duet rule).
H H
\ /
N -- C -- Cl
/
H
Step 4: Distribute the remaining valence electrons to complete the octet of the nitrogen atom.
Since nitrogen needs 8 electrons to complete its octet (octet rule), we place the remaining electrons around the nitrogen atom.
H H
| |
N - C - Cl
|| |
H H
Step 5: Check the total number of valence electrons used.
Count the number of valence electrons used in the Lewis structure.
2 (H) + 8 (N) + 8 (C) + 8 (Cl) = 26 valence electrons used.
Step 6: If there are extra valence electrons remaining, try forming double or triple bonds to complete octets.
In this case, all atoms have complete octets, and there are no extra valence electrons remaining.
The Lewis structure for chloramine (NH2CI) is complete with all atoms having full octets and a total of 26 valence electrons used.
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Which of the following would label the boxes correctly?
Question 1 options:
1) endothermic; 2) exothermic
1) products; 2) reactants
1) reactants; 2) products
1) exothermic; 2) endothermic
What is the approximate vapor pressure when the liquid water boils at about 50°C? 230 mmHg 5 mmHg 760 mmHg 380 mmHg
The correct answer is 230 mmHg.
When liquid water boils at 100°C, the water vapor pressure is 760 mmHg
Hence, when liquid water boils at 50°C, the water vapor pressure is (760/2) mmHg or 230 mm Hg.
As the boiling temperature of water halves so does the vapor pressure of water. This is in accordance to Pressure Law.
According to Pressure law, pressure is directly proportional to the absolute temperature, at constant volume.
Answer:
230 mmHg
Explanation:
Question 9 Saved
When electron move from an excited state to their ground state a continuous spectrum is emitted.
Question 9 options:
True
False
I believe the answer to this is true.
An Ammonia molecule is made up of one nitrogen and 3 hydrogen atoms, it has a formula NH3. What is the mass of one more Ammonia? **Hint find the molar mass of ammonia by adding up all of the masses of the elements in the compound.
The molar mass is the sum of the mass of all the atoms of a particular molecule.
The unit of molar mass is grams per mole.
The atomic mass of H = 1.00
The atomic mass of N = 14.00
The molar mass of ammonia = atomic mass of N + 3 x (atomic mass of H)
= 14.00 + 3 x (1.00) = 17.00
Therefore the molar mass of ammonia is 17g/mol
The correct answer is 17g/mol.
Which two values for `DeltaG` and E°cell correctly indicate a spontaneous reaction?
Well as an spontaneous reaction will have a negative gibbs free energy (delta g) and a positive e cell and also the E cell is also measured in V, then your answer is the first one: ΔG = –295kJ, E°cell = +1.53 v. Hope this works
A 29.950 g sample of an unknown metal is heated to 100.0 °c. The metal is then poured into 50.0 g of water in an insulated coffee cup calorimeter. The temperature of water rises from 25.0 ºc to 27.7 ºc. What is the specific heat of the metal?
Answer : The specific heat of metal is, [tex]0.261J/g^oC[/tex]
Explanation :
In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.
[tex]q_1=-q_2[/tex]
[tex]m_1\times c_1\times (T_f-T_1)=-m_2\times c_2\times (T_f-T_2)[/tex]
where,
[tex]c_1[/tex] = specific heat of unknown metal = ?
[tex]c_2[/tex] = specific heat of water = [tex]4.18J/g^oC[/tex]
[tex]m_1[/tex] = mass of unknown metal = 29.950 g
[tex]m_2[/tex] = mass of water = 50.0 g
[tex]T_f[/tex] = final temperature of water = [tex]27.7^oC[/tex]
[tex]T_1[/tex] = initial temperature of unknown metal = [tex]100^oC[/tex]
[tex]T_2[/tex] = initial temperature of water = [tex]25.0^oC[/tex]
Now put all the given values in the above formula, we get
[tex]29.950g\times c_1\times (27.7-100)^oC=-50.0g\times 4.18J/g^oC\times (27.7-25.0)^oC[/tex]
[tex]c_1=0.261J/g^oC[/tex]
Therefore, the specific heat of metal is, [tex]0.261J/g^oC[/tex]
All substances are composed of which type of matter?
A. ions
B. mixtures
C. elements
D. molecules
Using paper chromatography, how can you separate a homogeneous mixture into its component chemicals?
Paper chromatography is a tool frequently used in analytical chemistry to separate a homogeneous mixture into its components.
In paper chromatography the stationary phase is water which drenches the paper and the mobile phase is a mixture polar organic solvent and water. The various components of the homogeneous mixture is separated based on their relative solubility in either the mobile or stationary phase.
How many grams are in a mole of hydrogen chloride (hcl)? 1 h 1.01 hydrogen 17 cl 35.45 chlorine a. 1.5 grams/mole b. 35.45 grams/mole c. 36.46 grams/mole d. 72.92 grams/mole
The molecular mass is the sum of the atomic masses of the atoms.
Atomic mass :
H = 1.01 amu
Cl = 35.45 amu
HCl = 1.01 + 35.45
HCl = 36.46 grams/mole
Therefore:
1 mole of HCl is equivalent to 36.46 grams/ mole
answer C
Which of the following represents the number of grams of a solute in 100 grams of a solution?
Density
Molarity
Percent by mass
Volume
Answer:
Percent by mass
Explanation: I think
Percent by mass represents the number of grams of a solute in 100 grams of a solution. This is because it is the mass of the solute divided by the total mass of the solution, multiplied by 100.
Explanation:The option that represents the number of grams of a solute in 100 grams of a solution is Percent by mass. The definition of percent by mass in a solution, also known as mass percent, is the mass of the solute divided by the total mass of the solution, all multiplied by 100. Therefore, if you have a solution of 100 grams total, and you want to find out how many grams of solute you have in this solution, you would use percent by mass to calculate this.
Density, molarity, and volume have different uses and definitions in chemistry. Density is mass per unit volume, molarity is a measure of the concentration of a solute in a solution, and volume refers to the amount of space that matter occupies.
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What is the freezing point of a solution of sugar dissolved in water if the concentration of the solution is 0.24 m
A. -.446
B. .93
C. .446
Hey there!:
Using relation:
Δt = Kf * m
For water , Kf = 1.86 K/molal
Putting values:
Δt = 1.86 * 0.24
Δt = 0.446
So , Freezing point = - 0.446ºC
Answer A
Hope that helps!
The depression in freezing point here for the sugar solution is 0.466 degree Celsius. Hence the freezing point of the sugar solution is -0.446. Hence, option A is correct.
What is freezing point ?Freezing point of a solution is the temperature at which the solution changes from liquid to solid state.
To determine the freezing point of a solution of sugar dissolved in water, we need to use the freezing point depression equation:
ΔTf = Kf × molality
where ΔTf is the change in freezing point, Kf is the freezing point depression constant for the solvent (water in this case), and molality is the concentration of the solution expressed in moles of solute per kilogram of solvent.
Assuming a Kf of 1.86 °C/m for water, and a molality of 0.24 m for the sugar solution, we can calculate the change in freezing point:
ΔTf = 1.86 °C/m × 0.24 m = 0.4464 °C
This means that the freezing point of the solution will be lowered by 0.4464 °C compared to the freezing point of pure water. Since the freezing point of pure water is 0 °C, the freezing point of the sugar solution will be:
0 °C - 0.4464 °C = -0.4464 °C
Therefore, the freezing point of the solution is approximately -0.4464 °C, which is closest to option A. -0.446.
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Determine the empirical formula of a hydrate FexFy.ZH2O. It contains 0.676 g of iron combined with 0.460 g of fluorine and 0.870 g of water (H2O).
Hey there!:
Number of moles of iron:
Molar mass iron: 55.85 g/mol
0.676 / 55.85 => 0.012 moles of iron
Number of moles of fluorine:
Molar mass fluorine : 19 g/mol
0.460 / 19 => 0.024 moles of fluorine
Number of moles of water:
Molar mass water : 18.02 g/mol
0.870 / 18.02 => 0.048 moles of water
Simplest mol ratio is :
iron ( Fe ) = 0.012 / 0.012 => 1.0 mol
Florine ( F ) = 0.024 / 0.012 => 2.0 moles
Water ( H2O ) = 0.048 / 0.012 => 4 moles
Therefore:
Empirical formula is:
FeF2.4H2O
Hope that helps!
what determines the volume of a gas?
Explanation : Gases, unlike solids and liquids, have neither fixed volume nor shape. They are molded entirely by the container in which they are held. We have three variables by which we measure gases: pressure, volume, and temperature. ... From this, we derive the molar volume of a gas (volume/moles of gas).
Answer : The volume is determined by the pressure, the amount of gas present, and the temperature.
Which of the following indicates that an exothermic reaction has taken place?
A. a change in color
B. release of heat and/or light energy
C. cooling of the surroundings
D. absorption of heat by the reaction ...?
The option B is correct option. Which is release of heat and/or light energy .
Explanation:According to the definition of exothermic reaction :
An exothermic reaction is a chemical reaction that releases energy by light or heat.
From definition option B (release of heat and/or light energy) indicates that an exothermic reaction has taken place.
.
Answer: Option (B) is the correct answer.
Explanation:
An exothermic reaction is defined as the chemical reaction in which there occurs release of heat.
For example, [tex]A + B \rightarrow AB + Heat[/tex]
In an exothermic reaction, energy of reactants is more than the energy of products.
Whereas an endothermic reaction is defined as a chemical reaction in which heat is absorbed by reactant molecules.
For example, [tex]A + B + Heat \rightarrow AB[/tex]
In endothermic reaction, energy of reactant molecules is less than the energy of products.
Thus, we can conclude that release of heat and/or light energy indicates that an exothermic reaction has taken place.
When substances change into new substances, the process must involve:
a physical change
a chemical change
heat being produced
heat being absorbed
Answer is a chemical change.
As a result of a chemical reaction, a substance is changed into new substances which involves a chemical change.
During a chemical reaction, atoms of a molecule within a substance are rearranged into different combinations by combining with the atoms of another substance to form new substances.
An example of a chemical change is the composition of sodium chloride (salt) where the atoms of sodium and chlorine combine and rearrange themselves to form salt.
The pH of a solution is 1.20. What is the [H3O+] for the solution?
1.58 × 10−2 M
6.31 × 10−2 M
1.58 × 101 M
6.31 × 101 M
Answer:
[H₃O⁺] = 6.31 x 10⁻² mol·L⁻¹
Explanation:
pH = -log[H₃O⁺], so [tex][\text{H}_{3}\text{O}^{+}] = 10^{- \text{pH}} \text{ mol/L}[/tex]
[tex][\text{H}_{3}\text{O}^{+}] = 10^{-1.20}\text{ mol/L} = 6.31 \times 10^{-2}\text{ mol/L}[/tex]
Answer:
[tex]6.31*10^{-2}[/tex]
Explanation:
Hello! To calculate the pH we have the following formula:
ph = -log [H3O +]
In this case we have the pH value so the formula is
[H3O +] = [tex]10^{-pH}[/tex]
[H3O +] = [tex]10^{-1.2}[/tex]
We use the inverse of the log
[H3O +] = [tex]6.31*10^{-2}[/tex]
So the correct answer is [tex]6.31*10^{-2}[/tex]
PH of 0,035M HCl? How to count if your calculator hasn't got -lg?
Given information:
Concentration of HCl = 0.035 M
To determine:
pH of the solution
Explanation:
Hydrochloric acid, HCl is a strong acid. It will completely dissociate to give H+ and Cl- ions
HCl → H+ + Cl-
Hence the concentration of H+ = Cl- = 0.035M
Now, pH measures the strength of H+ ions in a given solution. It is expressed as:
pH = -log[H+]
pH (HCl) = -log(0.035) = 1.46
Ans: pH of 0.035M HCl is 1.46
Thomas has 235 grams of K2S in the chemistry lab. How many atoms of potassium (K) are in 235 grams of the compound?
A.
2.13 × 1023
B.
4.26 × 1023
C.
2.57 × 1024
D.
3.37 × 1024
E.
7.08 × 1024
Answer : The correct option is, (C) [tex]2.57\times 10^{24}[/tex]
Solution for Part 1 : Given,
Mass of [tex]K_2S[/tex] = 235 g
Molar mass of [tex]K_2S[/tex] = 110.262 g/mole
First we have to calculate the moles of [tex]K_2S[/tex].
[tex]\text{Moles of }K_2S=\frac{\text{Mass of }K_2S}{\text{Molar mass of }K_2S}=\frac{235g}{110.262g/mole}=2.13moles[/tex]
Now we have to calculate the number of atoms of potassium in the given compound.
In the given compound, there are 2 atoms of K and 1 atom of S.
As, 1 mole contains [tex]2\times 6.022\times 10^{23}[/tex] number of potassium atoms
So, 2.13 moles contains [tex]2.13\times 2\times 6.022\times 10^{23}=2.57\times 10^{24}[/tex] number of potassium atoms
Therefore, the number of potassium atoms in given compound is, [tex]2.57\times 10^{24}[/tex]
Explanation for Part 2 :
Statement 1 : A balloon shrinks when it's taken outside in the winter.
This statement follow the Charles's law. There is a direct relation between the temperature and volume. As the temperature decreases, the volume also decreases and vice-versa.
Statement 2 : A closed, flexible container expands when it's heated.
This statement follow the Charles's law. There is a direct relation between the temperature and volume. As the temperature increases, the volume also increases and vice-versa.
Statement 3 : When the size of an air chamber is increased, the air pressure decreases.
This statement follow the Boyle's law. There is an inverse relation between the pressure and volume. As the pressure decreases, the volume increases and vice-versa.
Statement 4 : Pressing on an inflated balloon decreases its size.
This statement follow the Boyle's law. There is an inverse relation between the pressure and volume. As the pressure increases, the volume decreases and vice-versa.
Statement 5 : A balloon expands when air is blown into it.
This statement follow the Avogadro's law. There is a direct relation between the number of moles of gas and volume. As the number of moles of air increases, the volume also increases and vice-versa.
Answer:
2.57 x 10^24
Explanation:
This is correct! :)