The statement which is true about the valence electrons of cesium and calcium is as follows:
Cesium has fewer valence electrons but they are at a higher energy level than calcium's valence electrons.Thus, the correct option for this question is B.
What are Valence electrons?
Valence electrons may be defined as the number of electrons that are present in the outermost shell of any element. For example, Sodium has an atomic number of 11. Its electronic configuration is 2, 8, and 1. Here, one electron is present in the outermost shell, so, sodium has only one valence electron.
According to the electronic configuration, it is found that cesium has only one valence electron, while calcium has two. So, the number of valence electrons is more in calcium as compared to cesium.
But, the valence electron found in cesium is at a higher energy level due to the completed d-orbital.
Therefore, the correct option for this question is B.
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"What product of the reaction of methane has an impact on the environment?"
A. CO2
B. 2H20
C. Energy
Explanation:
When methane is burnt with oxygen,like all hydrocarbons,it produces CO2 and H20.
CO2 is a greenhouse gas which means it leads to global warming.
Answer:
Carbon dioxide (CO2) is a product of the reaction of methane with oxygen.
Explanation:
Carbon dioxide is a known cause of climate change, which has a negative effect on the environment.
b. onsia, t. conard, s. de gendt, m. heyns, i. hoflijk, p. mertens, m. meuris, g. raskin, s. sioncke, i. teerlinck, a. theuwis, j. van steenbergen, c. vinckier, "a study of the influence of typical wet chemical treatments on the germanium wafer surface," solid state phenom. 103-104, 19-22 (2005)
The influence of various wet chemical treatments on the germanium wafer surface has been examined. The GeO2 part of the native oxide is readily dissolved in water. The solubility of the GeO2 in aqueous solutions and the fast oxidation of germanium makes commonly used silicon treatments nonapplicable due to the relatively high etch rates. In various etching chemistries, the underlying suboxide is not attacked. A hydroxylated suboxide might be an ideal starting surface for ALD, because of its low contribution to electrical thickness. HBr removes even the suboxide and yields a completely oxide-free germanium surface which makes it a candidate surface preparation technique for epitaxial growth. The same result is obtained using a HI dip followed by a DIW rinse. Oxide is growing in CR-air, while in N 2 ambient the surface remains stable.
An oxide is a category of chemical compound that has one or more oxygen atoms as well as another element in its composition such as Li2O, CO2, H2O, etc.
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Substances that can either take up hydrogen ions or release hydroxide ions into water are called.
Bases are substances that can release hydroxide ions or take up hydrogen ions into the water.
Bases are those substances that have a pH above 7. They are bitter. When bases are added to water, they release hydroxide ions. And takes up hydrogen ions. Bases that fall at the pH of 8 are considered weak bases whereas those bases that fall at the pH of 14 are considered strong bases. A few examples of bases are sodium hydroxide, calcium hydroxide, potassium hydroxide, etc.
[tex]NaOH + H _{2}O→ Na ^{ + } + OH ^{ - } [/tex]
Substances that fall within the pH of 7 are considered neutral substances.
Acids are substances that have a pH below 7. They are sour. When acids are added to water they release hydrogen ions. Acids that fall at the pH of 6 are considered weak acids whereas those bases that fall at the pH of 1 are considered strong acids. A few examples of acids are acetic acid, hydrochloric acid, sulphuric acid, nitric acid, etc.
[tex]CH _{3}COOH + H _{2} O→COO ^{ - } + H ^{ + } [/tex]
Therefore, the substances that release hydroxide ions or take up hydrogen ions into the water are known as bases.
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You need 150g of pure lithium for an experiment you're doing. You have 675g of lithium oxide (Li2O). Can you extract all the lithium you need from the amount of compound you have? Show your reasoning.
Answer: Yes we can extract all the lithium from the amount of compound we have.
Explanation:
To calculate the moles :
[tex]moles=\frac{\text {given mass}}{\text {Molar mass}}[/tex]
[tex]\text{Moles of} Li=\frac{150g}{7g/mol}=21.4moles[/tex]
[tex]\text{Moles of} Li_2O=\frac{675g}{30g/mol}=22.5moles[/tex]
[tex]2Li_2O\rightarrow 4Li+O_2[/tex]
According to stoichiometry :
2 moles of [tex]Li_2O[/tex] produce 4 moles of [tex]Li[/tex]
Thus 22.5 moles of [tex]Li_2O[/tex] will produce=[tex]\frac{4}{2}\times 22.5=45moles[/tex] of Li
As 21.4 moles is a lesser quantity than 45 moles, thus it can be produced
Yes, you can extract all the lithium you need from the compound
We'll begin by calculating the mass of lithium, Li in 1 mole of Li₂O. This can be obtained as described below:
1 mole of Li₂O = (2×7) + 16
1 mole of Li₂O = 14 + 16 = 30 g
SUMMARY
30 g of Li₂O contains 14 g of Li.
With the above information in mind, we can determine the mass of Li in 675 g of lithium oxide, Li₂O. This can be obtained as follow:30 g of Li₂O contains 14 g of Li.
Therefore,
675 g of Li₂O Will contain = (675 × 14)/30 = 315 g of Li.
From the calculation made above, we can see that there are 315 g of Li in 675 g of Li₂O. Thus, we can conclude that 150 g of Li can be extracted from the compound (i.e 675 g of Li₂O)Learn more: https://brainly.com/question/15381525
whoever answers this first gets brainly
Answer:
D. lysosome
Explanation:
hope it helps :D
sorry if its wrong :/
Calculate the mass of 1.25 mol ammonium sulfide, (NH4)2S. *
Answer:
85g
Explanation:
To convert the moles of a substance to grams we need to know the molar mass of the substance. We, as first, must obtain the molar mass of (NH₄)₂S as follows:
There are 2 atoms of N, 8 of H and 1 of S:
N = 2*14g/mol = 28g/mol
H = 8*1g/mol = 8g/mol
S = 1*32g/mol = 32g/mol
Molar mass: 68g/mol
That means 1 mole of (NH₄)₂S has a mass of 68g.
1.25moles have a mass of:
1.25moles * (68g/mol) =
85gAn object in motion has what type of energy?
A magnetic
B kinetic
C possible
D chemical
Answer:
B) Kinetic
Explanation:
Kinetic Energy is energy relating to or resulting from motion. Therefore, the answer to this question is B.
Answer:
The answer is option B - Kinetic energy.
Explanation:
The Energy that a moving object has due to its motion is Kinetic Energy.
what type of friction is talking
Answer:
does friction talks ? friction is a oppossing force tho
In a solid, the particles..
A. Vibrate in place
B. Overcome the strong attraction
C. Slide past one another
D. Move freely
Please help me to do this assignment
Answer:
1. Objective
2. Objective
3. Opinion
4. Objective
5. Opinion
6. Opinion
7. Opinion (I think.)
8. Opinion (I think.)
Explanation:
why elements are arranged according to atomic number rather than atomic mass in the periodic table
Answer:
hope it helps...
Explanation:
Atomic Number as the Basis for the Periodic Law
Assuming there were errors in atomic masses, Mendeleev placed certain elements not in order of increasing atomic mass so that they could fit into the proper groups (similar elements have similar properties) of his periodic table.
How many grams of CO2 are contained in 4.77x10^24 molecules of of CO2?
Answer:
3.5x1024 3.5 x 10 24 carbon dioxide molecules weighs 256 g.
explain why diamond has a high melting point
Answer:
Each carbon atom is covalently bonded to 4 other carbon atoms in diamond. A large amount of energy is required to split these atoms apart. This is because of the fact that covalent bonds are strong.
In diamond 4 carbon atoms are strongly bonded with covalent bond and they form giant covalent structure which requires large amount of energy to break down, that’s why diamond has a high melting point. It does not conduct electricity.
How many orbitals would mercury (Hg) have?
Answer:
6 orbitals
Explanation:
An atom of mercury will have 6 - orbitals because it can be found on the 6-period in the periodic table of elements.
Orbitals or shells are energy levels in which electrons are placed within an atom.
Let us write the shell notation of the element:
Hg has 80 electrons:
K L M N O P
2 8 18 32 18 2
So, we have six orbitals
1.) a copper penny has a mass of 3.1 g and a volume of 0.35 cm^3. what is the dencity of the copper penny?
2.) A block of wood has the dimensions 7.0 cm x 10.0 cm x 5.0 cm. What is the
volume of the block of wood?
3.) A graduated cylinder has a volume of 50.0 ml of water. After a rubber cork is
placed in the graduated cylinder, the volume of the water rises to 53.0 ml. If
the mass of the rubber cork is 4.3 g, what is its density?
4.) Calculate the volume of a book with a density of 9.9 g/cm3 and a mass of 58.5 g.
5.) Find the mass of iron if its density is 6.7 g/ml and it has a volume of 5 ml.
1.)
density is found by [tex]\rho=\frac{m}{V}[/tex]
[tex]\rho=\frac{3.1}{0.35}\\\\ \rho=8.857 g/cm^3[/tex]
2.)
Volume is [tex]lwh[/tex]
7*10*5
V=350[tex]cm^3[/tex]
3.)
using the density formula
[tex]\rho=\frac{m}{V}[/tex]
[tex]\rho=\frac{4.3}{3}[/tex]
[tex]\rho=1.43g/ml[/tex]
4.)
rearrange the density formula for V
[tex]V=\frac{m}{\rho}[/tex]
[tex]V=\frac{58.5}{9.9}\\\\ V=5.909cm^3[/tex]
5.)
rearrange the density formula for [tex]m[/tex]
[tex]m=\rho V\\\\m=(6.7)(5)\\\\m=33.5g[/tex]
Select the answer with the correct number of significant figures for each calculation. 31.580 + 4.26 = 35.8 35.84 35.840
Answer:
35.8.540 its korrect now
to save time you can approximate the initial volume of water to ±1 ml and the initial mass of the solid to ±1 g . for example, if you are asked to add 23 ml of water, add between 22 ml and 24 ml . which metals in each of the following sets will have equal density?
The metals in the following set which will have equal density are:
20.2 g of silver when placed in 21.6 mL of water and 12.0 g of silver when placed in 21.6 mL of water.15.2 g of copper when placed in 21.6 mL of water and 50.0 g of copper when placed in 23.4 mL of water.11.2 g of gold when placed in 21.6 mL of water and 14.9 g of gold when placed in 23.4 mL of waterSo, the correct options are 2,3 and 6.
A substance or object's density can be found out by comparing its mass to volume. Density is calculated using the formula:
[tex]density = \frac{mass}{volume}[/tex]
It is an essential property that the density of the same material remains constant at varied masses and volumes. Since the metal used in both situations is the same and metal has a fixed value of density, the choice with sets of the same metals has equal densities across the possibilities provided.
The complete question is as follows:
To save time you can approximate the initial volume of water to ±1 mL and the initial mass of the solid to ±1 g. For example, if you are asked to add 23 mL of water, add between 22 mL and 24 mL. Which metals in each of the following sets will have equal density?
1. 20.2 g gold placed in 21.6 mL of water and 12.0 g copper placed in 21.6 mL of water.
2. 20.2 g silver placed in 21.6 mL of water and 12.0 g silver placed in 21.6 mL of water.
3. 15.2 g copper placed in 21.6 mL of water and 50.0 g copper placed in 23.4 mL of water.
4. 15.4 g gold placed in 20.0 mL of water and 15.7 g silver placed in 20.0 mL of water.
5. 20.2 g silver placed in 21.6 mL of water and 20.2 g copper placed in 21.6 mL of water.
6. 11.2 g gold placed in 21.6 mL of water and 14.9 g gold placed in 23.4 mL of water.
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How hot would the water be if all the light reaching the two beakers had been transmitted
If the light completely falls on the two beakers, the degree of hotness increases with respect to time, while if the light is transmitted, the water would gradually cool down.
What is the effect of transmitted light on temperature?The effect of transmitted light on temperature is understood by the fact that the intensity of transmitted light became maximum during the process of cooling. While it gets the opposite when the water warms significantly.
According to the context of this question, if all the light reaching the two beakers had been transmitted, the degree of hotness of the water gradually declines. Due to this, the water in the two beakers cool down.
Therefore, the water cools slowly if all the light reaching the two beakers had been transmitted.
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What is the boiling point (in C) of a 0.743 m
aqueous solution of KCI?
Enter your rounded answer with
3 decimal places.
The boiling point (in C) of a 0.743 m aqueous solution of KCI : 100.7608°C
Further explanationSolutions from volatile substances have a higher boiling point and lower freezing points than the solvent
ΔTb = Tb solution - Tb solvent
ΔTb = boiling point elevation
[tex]\large {\boxed {\boxed {\bold {\Delta Tb \: = \: Kb.m}}}[/tex]
For electrolyte solutions there is a van't Hoff factor = i
i = 1 + (n-1) α
n = number of ions from the electrolyte
α = degree of ionization, strong electrolyte α = 1, for non electrolytes i = 1
KCl⇒K⁺+Cl⁻⇒ electrolyte solution(2 ions K⁺ and Cl⁻), strong electrolyte α = 1
ΔTb=Kb.m.i
i = 1 + (n-1) α
i=1+(2-1).1=2
Kb for water (solvent) : 0.512 °C kg/mol
molal KCl = 0.743 m
The boiling point of solution :
[tex]\tt Tb-100=0.512\times 0.743\times 2\\\\Tb-100=0.7608\\\\Tb=100.7608^OC[/tex]
The correct answer is 100.761.
What is the importance of the fundamental laws of chemistry?
Law of Conservation of mass: Mass cannot be created nor destroyed. Reference: Antoine Lavoisier – By carefully weighing the reactants & products of chemical reactions. The laws of chemical combination describe the basic principles obeyed by interacting atoms and molecules, interactions that can include many different combinations that happen in many different ways. This amazing diversity of interactions allows for an astounding variety of chemical reactions and compounds. The most fundamental concept in chemistry is the law of conservation of mass, which states that there is no detectable change in the quantity of matter during an ordinary chemical reaction. Modern chemistry is based on several fundamental laws, including:
The law of multiple proportions.The law of definite proportions.The law of conservation of mass.why law of conservation of mass should better be called as law of conservation of mass and energy
Answer:
Energy can neither be created not be destroyed
Mass too can neither be created nor be destroyed
Both of them remain conserved during any chemical or physical reaction
Some part of them gets transformed to undesired useless form
Hence law of conservation of mass should better be called the law of conservation of mass and energy
I hope helps you and if you consider and want you can give me a Brainly crown
Which type of organism is a prokaryote?
OA) plant
OB) animal
OC) fungus
OD) bacterium
Answer:
D
Explanation:
Answer:
D) Bacterium
Explanation:
CHOOSE ONE AND I WILK GIEV YOU BRAINLIEST AND DONT GUESS PLEASE!!!..
Answer:
c
Explanation:
HELP ME ASAP PLEASE LOTS OF POINTS
Determine the average atomic mass of Sulfur, given the following:
There are 3 isotopes of the element Sulfur the mass numbers and abundances are as follows:
S-32: 94.99%; S-33: .75%; S-34: 4.26%
Answer: 32.06 atomic mass units
Explanation:
85miles/hours south is an example of? this is science btw
Answer:
I believe it's an example of velocity
Explanation:
This is because 85miles/hour south is giving both magnitude (85miles/hour) and direction (south)
when a student adds 30.0mL of 1.00M HCl to 0.56g of powdered Fe, a reaction occurs according to the equation above. When the reaction is complete at 273K and 1.0 atm, which of the following is true?
A) HCl is in excess, and 0.100 mol of HCl remains unreacted
B) HCl is in excess, and 0.020 mol of HCl remains unreacted
C) 0.015 mol of FeCl2 has been produced
D) 0.22L of H2 has been produced
Answer:
Explanation:
Sup Wayne I need this answer too.
Answer: 0.22 L of H2 has been produced
Explanation:
based on their lewis dot diagram, which of the following elements is a metal
Answer:
Explanation:
b
The second answer option shows a metal element.
We can arrive at this answer because:
The Lewis dot diagram is used to demonstrate the electrons in the valence layer of the elements.This diagram is made with the symbol of the element surrounded by dots that represent the number of electrons in its valence layer.Metals have one or two electrons in the valence layer, in which case, in the Lewis point diagram, metal would be represented with one or two points around the element symbol.
Among the answer options shown in the question above, the second option is the only one that represents a metal.
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What makes the Bactria move
Answer:
b
Explanation:
a 657-ml sample of unknown HCL solution reacts completely with Na2CO3 to form 11.1 g CO2. What was the concentration of the HCI solution?
The concentration of the HCI solution : 0.767 M
Further explanationReaction
Na₂CO₃ (aq) + 2 HCl (aq) → 2 NaCl (aq) + CO₂ (g) + H₂O (l)
mass of CO₂ = 11.1 g
mol of CO₂ (MW= 44,01 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{11.1}{ 44,01}\\\\mol=0.252[/tex]
From the equation above, mol ratio of HCl : CO₂ = 2 : 1, so mol HCl :
[tex]\tt mol~HCl=\dfrac{2}{1}\times 0.252=0.504[/tex]
Molarity shows the number of moles of solute in every 1 liter of solution.
[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]
The molarity of unknown HCl :
mol=n=0.504
volume=V=657 ml=0.657 L
[tex]\tt M=\dfrac{0.504}{0.657}\\\\M=0.767[/tex]
In the current periodic table, how are the elements arranged?
a. the bonding power with oxygen
b. the number of neutrons
c. atomic mass
d. atomic number
Answer:
The answer would be
C. The number of neutrons
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