Answer:
d. Electrons would be ejected and they would have greater kinetic energy than those ejected by yellow light.
Explanation:
A formula that describes the kinetic energy of an electron ejected when a surface is truck by light is:
Ephoton = KineticEnergyElectron + ΦAs you see, the higher the energy of the photon striking the surface, the higher the kinetic energy of the ejected electron.
Ultraviolet light has more energy than yellow light, so it would cause the ejected electron to have greater kinetic energy as well.
Explain what is wrong with the following structure.
Answer:
oxygen should be the central atom in the middle
Explanation:
hydrogens always go on the outside
Hydrogen cannot have more than two electrons.
Hydrogen bonds to only one other atom at a time.
There are too many electrons in the final structure.
how many neutrons does an atom of Vanadium contain
Answer: 28
Explanation:
You are asked to determine the identity of an unknown liquid and can measure only one physical property. You heat the liquid and record that the liquid turns to vapor at 100°C.
Which physical property does this demonstrate?
A. boiling point
B. malleability
C. ability to conduct electricity
D. melting point
Answer:
A. boiling point
Explanation:
I'm not good at explaining science but...
Heating- keyword
I would take out b and c because you don't need heat for those.
When it's liquid, it would boil, not melt.
Vapor is also a sign of boiling.
Classify the following bonds as ionic, polar cova-
lent, or covalent, and give your reasons: (a) the
SiSi bond in Cl3SiSiCl3, (b) the SiCl bond in
Cl3SiSiCl3, (c) the CaF bond in CaF2, (d) the NH
bond in NH3.
Answer:
a) Covalent
b)Polar Covalent
c)Ionic
d)Coordinate Covalent
Explanation:
The SiSi bond in Cl3SiSiCl3 is covalent, the SiCl bond in Cl3SiSiCl3 is polar covalent, the CaF bond in CaF2 is ionic and the NH bond in NH3 is covalent.
What is covalent bond?The covalent bond is defined as a chemical bond that involves sharing of an electron pair between the atoms.
A covalent bond formed when there difference is the electronegativities of two atoms is too small for an electron transfer to occur to form ions.
The ionic bond is defined as a form of a chemical connection in which one atoms loses valance electrons and gain them from another.
A ionic bond is formed by interaction of oppositely charge ions .
Thus, SiSi bond in Cl3SiSiCl3 is covalent, the SiCl bond in Cl3SiSiCl3 is polar covalent, the CaF bond in CaF2 is ionic and the NH bond in NH3 is covalent.
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Where do genetic traits originate and how are they passed from one generation to the next?
Match the era on the left with its characteristic on the right.
Mesozoic
?
The first era
Cenozoic
?
The era before the current
one
Paleozoic
?
When life first flourished
on Earth
2
Precambrian
?
The current era
PREVIOUS
Answer:
Mesozoic - the era before the current one
Cenozoic - the current era
Paleozoic - when life first flourished
Precambrian - the first era
Explanation:
The Precambrian is the earliest part of Earth's history, the first era. It's named like this because it preceded the Cambrian - the first period of the Phanerozoic eon, which is the current geologic eon. It lasted from the beginning of Earth (about 4.6 billion years ago) to the beginning of the Cambrian Period (about 541 million years ago).
Paleozoic is an era that lasted from about 541 to about 252 million years ago. During this time, life began to flourish.
Mesozoic is an era that lasted from about 252 to 65 million years ago. It's the era that took place before the current one - the Cenozoic.
Assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at −14.5 ∘C
Answer:
108.43 grams KNO₃
Explanation:
To solve this problem we use the formula:
ΔT = Kf * b * iWhere
ΔT is the temperature difference (14.5 K)Kf is the cryoscopic constant (1.86 K·m⁻¹)b is the molality of the solution (moles KNO₃ per kg of water)and i is the van't Hoff factor (2 for KNO₃)We solve for b:
14.5 K = 1.86 K·m⁻¹ * b * 2b = 3.90 mUsing the given volume of water and its density (aprx. 1 g/mL) we calculate the necessary moles of KNO₃:
275 mL water ≅ 275 g water275 g /1000 = 0.275 kgmoles KNO₃ = molality * kg water = 3.90 * 0.275moles KNO₃ = 1.0725 moles KNO₃Finally we convert KNO₃ moles to grams, using its molecular weight:
1.0725 moles KNO₃ * 101.103 g/mol = 108.43 grams KNO₃When a solid reaches its melting point, what happens? 1. melting 2. freezing. 3. vaporization 4. boiling
What happens in the redox reaction below? Select all that apply.
Na + F + NaF
A- Fluorine loses an electron.
B- Sodium loses an electron.
C- Sodium gains an electron.
D- Fluorine gains an electron.
E- Sodium is oxidized.
Answer:
B- Sodium loses an electron.
D- Fluorine gains an electron.
Sodium is oxidized.
Explanation:
The reaction equation is given as:
Na + F → NaF
In this reaction, Na is the reducing agent. It loses an electron and then becomes oxidized. By so doing, Na becomes isoelectronic with Neon.
Fluorine gains the electron and then becomes reduced. This makes fluorine also isoelectronic with Neon.
This separation of charges on the two species leads to an electrostatic attraction which forms the ionic bonds.
If 11.2 g of naphthalene, C10H8, is dissolved in 107.8 g of chloroform, CHCl3, what is the molality of the solution?
a. 0.811m
b. 0.0941 m
c.12.4 m
d. 0.0875 m
e. 0.0969m
Answer: 0.811m
Explanation: Molarity is the moles of solute present per kg of solvent.
Molar mass of C10H8 = . 128.17 g/mol
No. of moles = given mass/molar mass
11.2g C10H8 = 11.2/128.17 g/mol C10H8
= 0.0874 mol C10H8
NOW 107.8g solvent (chloroform) contains 0.0879 molecules (naphthalene)
1000g '' will contain (0.0879/107.8 x 1000) mole solute
= 0.811 mole
Molarity of the solution is 0.811 m (option A)
For the following reaction (production of ethanol) C2H4 +H2O——>C2H5OH
A. How many moles of water will be used to produce 10 mol of C2H5OH
B. If you need to produce 27 mol C2H5OH how many moles of C2H4 will be used?
Answer:
A: 10 moles of water are required.
B: 27 moles of C₂H₄ are used.
Explanation:
A:
Given data:
Moles of water used = ?
Moles of C₂H₅OH formed = 10 mol
Solution:
Chemical equation:
C₂H₄ + H₂O → C₂H₅OH
Now we will compare the moles of water with C₂H₅OH from balance chemical equation:
C₂H₅OH : H₂O
1 : 1
10 : 10
10 moles of water are required.
B)
Given data:
Moles of C₂H₄ used = ?
Moles of C₂H₅OH formed = 27 mol
Solution:
Chemical equation:
C₂H₄ + H₂O → C₂H₅OH
Now we will compare the moles of C₂H₄ with C₂H₅OH from balance chemical equation:
C₂H₅OH : C₂H₄
1 : 1
27 : 27
27 moles of C₂H₄ are used.
The orbital diagram above is from the element ?
Answer:
Phosphorus
Explanation:
In given diagram there are 15 electrons are present. Which means it is orbital diagram of phosphorus.
The atomic number of phosphorus = 15
Number of electrons = 15
Electronic configuration of phosphorus:
P₁₅ = 1s² 2s² 2p⁶ 3s² 3p³
All other options are incorrect because:
Calcium have 20 electrons.
Electronic configuration of Ca:
Ca₂₀ = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
Hydrogen have one electron.
Electronic configuration of H.
H₁ = 1s¹
Magnesium have 12 electrons:
Electronic configuration of Mg:
Mg₁₂ = 1s² 2s² 2p⁶ 3s²
3. Which has the largest atomic radius? *
O Calcium
0 Iron
Gallium
O Bromine
Answer:
the correct answer is calcium becuase it is over 200.
Explanation:
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Blood samples for research or medical tests sometimes have heparin added. Why is this done?
Indium-116 is radioactive and has a half life of 14.10 seconds. How long would it take a sample to decay from 7.70 mg to 900 µg.
Answer: 43.73 seconds
Explanation:
Half-life of indium = 14.10 sec
First we have to calculate the rate constant, we use the formula :
[tex]k=\frac{0.693}{t_\frac{1}{2}}[/tex]
[tex]k=\frac{0.693}{14.10}=0.0491sec^{-1}[/tex]
Now we have to calculate the age of the sample:
Expression for rate law for first order kinetics is given by:
[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]
where,
k = rate constant
t = age of sample = ?
a = initial amount of the reactant = 7.70 mg= [tex]7700\mug[/tex]
[tex](1mg=1000\mug[/tex]
a - x = amount left after decay process = [tex]900\mug[/tex]
Now put all the given values in above equation, we get
[tex]t=\frac{2.303}{0.0491}\log\frac{7700}{900}[/tex]
[tex]t=43.73sec[/tex]
Thus it would take 43.73 seconds sample to decay from 7.70 mg to 900 µg.
The analysis of a compound containing K, P and O showed 55 % K, 15 % P and 30 % O, set up the simplest empirical formula of this compound.
Answer:
Empirical formula is K₃PO₄.
Explanation:
Given data:
Percentage of K = 55%
Percentage of P = 15%
Percentage of O = 30%
Empirical formula = ?
Solution:
Number of gram atoms of K = 55 / 39.098 = 1.41
Number of gram atoms of P = 15 /30.974= 0.48
Number of gram atoms of O = 30 / 15.999 = 1.88
Atomic ratio:
K : P : O
1.41/0.48 : 0.48/0.48 : 1.88/0.48
3 : 1 : 4
K : P : O = 3 : 1 : 4
Empirical formula is K₃PO₄.
What is the frequency of a photon that has 3.82 x 10^-20 J of energy?
Answer:
5.73498*10^13
Explanation:
............
which compound has covalent bonds? H2O, Li2O, Na2O, K2O
Answer:
H2O
Explanation:
H2O is just given as a covalent compound... Usually covalent bonds occur between 2 or more nonmetals.
Water or H₂O is a compound which has covalent bonds as there is slight difference in electronegativity of hydrogen and oxygen atoms.
What is a covalent bond?
Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.
Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.
Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.
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What's the molality of a solution with 120 g of NaCl and 30 kg of water?
Answer:
0.07mol/kg
Explanation:
Given parameters:
Mass of NaCl solution = 120g
Mass of water = 30kg
Unknown:
Molality of the solution =?
Solution:
The molality of a solution is the number of moles of the solute per mass of the solution.
Molality = [tex]\frac{number of moles of solute}{mass of solution}[/tex]
Number of moles of NaCl = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
Number of moles of NaCl = [tex]\frac{120}{58.5}[/tex] = 2.05mole
So;
molality = [tex]\frac{2.05}{30}[/tex] = 0.07mol/kg
Answer:
0.068
Explanation:
How many pi bonds are in the oxalate ion (C2O42-)?
Answer:there are 13
Explanation:
There are two types of chemical compound one is covalent compound and another is ionic compound in chemistry. In ionic bonds, electrons are completely transferred. Therefore, there are 2 pi bonds in oxalate ion C[tex]_2[/tex]O[tex]_4[/tex]²⁻.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
Covalent compounds are formed by covalent bond and ionic compounds are formed by ionic bond. Covalent bond is formed by sharing of electron and ionic bond are formed by complete transfer of electron. Ionic bonds are stronger than covalent bonds. The melting and boiling points are higher in ionic compounds. There are total 2 pi bonds in oxalate ion C[tex]_2[/tex]O[tex]_4[/tex]²⁻.
Therefore, there are 2 pi bonds in oxalate ion C[tex]_2[/tex]O[tex]_4[/tex]²⁻.
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More points for the world
Answer:
thaaaaaaaaaaaannnnkssss
Explanation:
sssssssssssssss
Answer:
jgiuufiydifiydifiyfkhditdihfkcgdraoyfufhkdoyfhvljcohchochcofohfoydoyfiyfohc
Explanation:
kxydutdoufuodyiflfjslufkysluftwykdhmdtwkggjaurq arrival arrival
Two objects are described below.
Object 1: A skateboard with unbalanced forces
Object 2: A bicycle with balanced forces
Which statement is true about the objects?(2 points)
Both objects are moving.
Both objects are not moving.
Object 1 is moving, and Object 2 is not moving.
Object 1 is not moving, and Object
Answer:
Both objects are moving.
Explanation:
Object 1 is moving because the unbalanced force acting on the skateboard is causing it to either move slower or move faster. An example of this is when the skateboard is going down the hill. The unbalanced force is caused by the gravity which speeds up the skateboard.
Object 2 is also moving although it has a balance force; however, it is moving at a "constant speed." This is because the force of thrusting forward is being counteracted by a friction force of the same magnitude. Forces that are equal in magnitude and of opposing directions causing the speed to be constant. So, the bicycle is still moving.
Polarity and intermolecular forces gizmo assessment
What type of bond will result if the atoms below combine? The electronegativity of each atom is given.
Cs0.79
F4.0
Answer:
Ionic or electrovalent bonds
Explanation:
The bond type that will result when the two atoms combine is an electrovalent or ionic bond. This is due to the large electronegativity difference between the given species.
An ionic bond usually forms between metals and non-metals. The metal being electropositive has a very low electronegativity value. Non-metals are electronegative. The Cs will lose it electrons to F This leaves a net negative charge on F and a net positive charge on Cs.The type of bond that will result if the atom Cs and F combine will be an electrovalent bond or ionic bond.
From the given atom, Caesium Cs with an electronegativity of 0.79 is a Group 1 metal which is an alkali metal.
Fluorine F with electronegativity 4.0 is a member of the halogen family.
An Electrovalent bond or ionic bond is a type of bonding reaction that occurs between group 1 metals and group 7 elements due to the high difference in their electronegativities.
Therefore, Cs and F form CsF via electrovalent bonding or ionic bonding with one another.
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Consider the temperature versus time graph below. A graph of temperature versus time has time on the horizontal axis and temperature in degrees Celsius from negative 20 to 140 on the vertical axis. A line extends through the following points: 0, negative 10; 4, 0; 7, 140; 18, 120; 19, 125. At what temperature is the substance a heated gas? at 100°C below 0°C above 100°C between 0°C and 100°C
Above 100°Celsius is the temperature at which the substance is converted into a gas.
Different liquids have different boiling points at which they change from liquid to gaseous state. The boiling point of water is 100°Celsius means at 100°Celsius or above temperature, the water changes from liquid form into gas form or vapour form so we can conclude that at high temperature i.e. above 100°Celsius the substance is converted from liquid state to gaseous state.
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sodium chloride is made from sodium and chloride. would you expect the properties of sodium chloride to be simliar to sodium or cloride
Answer:
No
Its a chemical change so the characteristics or chemical properties always differs thereby the properties of sodium chloride isn't similar to sodium or chloride
The mercury-201 nuclide radioactively decays by electron capture. Write a balanced nuclear chemical equation that describes this process.
Answer:
Explanation:
Electron capture is a form of beta decay in which the nucleus of a radionuclide captures an electron. In the case of mercury-201, the equation below illustrates that
²⁰¹₈₀Hg + ⁰₋₁e ⇒ ²⁰¹₇₉Au
As can be seen above, the electron capture reduces the atomic number by one unit leading to the production of a new radioisotope (because of the change in atomic number).
Why did the hot water rise? Use faster, molecules, energy, density in your answer.
Answer:
Convection
Explanation:
Hot water will rise due to heat transfer by convection occurring in the heating system.
When a fluid is heated, the molecules will gain thermal energy. As the thermal energy of the liquid increases, the molecules will have heat which is average kinetic energy in the system. This causes them to be less denser and they rise in the cooking medium. As they rise, the colder part of the water sinks down to replace them in the pot. This exchange sets up convection cells in the heating medium.Why do you think elements have these repeating patterns and groups of similar elements ? Explain your reasoning as much as you can.
Answer:
The elements in the periodic table are arranged in order of increasing atomic number. All of these elements display several other trends and we can use the periodic law and table formation to predict their chemical, physical, and atomic properties. Understanding these trends is done by analyzing the elements electron configuration; all elements prefer an octet formation and will gain or lose electrons to form that stable configuration.
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There is a concentrated (12.0 M) solution of HCl in the lab storage area. You need to prepare 1600. mL of HCl solution that has a pH equal to 1.50.
a) What volume of the 12.0 M HCl solution do you need?
b) What volume of water do you need?
a. 0.00426 L
b. 1.596 L
Further explanationThe number of moles in dilution will remain constant
Can be formulated
[tex]\tt M_1.V_1=M_2.V_2[/tex]
a.
M₁=12
M₂=[tex]\tt 10^{-1.5}(pH=-log[H^+])[/tex]=0.032
V₂=1.6 L
[tex]\tt 12\times V_1=0.032\times 1.6\\\\V_1=0.00426~L[/tex]
b.
[tex]\tt 1.6-0.00426=1.596~L[/tex]
A hard substance that has a high melting point and is a poor conductor of electricity in the solid phase could be
A) CO2
B) Mg
C) NaCl
D) CCl4
Answer:
C) NaCl
Explanation:
A hard substance that has a high melting point and is a poor conductor of electricity in the solid phase could be NaCl
This because it is an ionic compound.
Ionic compounds are formed via the electrostatic attraction between oppositely charged ions. Ionic substances have high melting point as solids and as liquids, they have a high boiling point. In aqueous solutions or in molten form, ionic compounds can conduct an electric current using free mobile ions as carriers. In solid state, the ions are arranged into a crystal lattice and will not conduct a current of electricity.Compounds like NaCl, MgO, NaF are in this category.
The hard substance that has a high melting point and is a poor conductor of electricity in the solid phase could be NaCl.
ElectrolytesElectrolytes are substances which conduct electricity when in the molten or solution state.
Properties of Electrolytes.They are solids with high melting pointsThey conduct electricity in the molten or solution state. Thus they were poor conductors in the solid state.They are usually acids, salts or bases.Examples are NaCl, KCl, HCl, KOH, etc.Ionic compoundsIonic compounds are compounds which are composed of oppositely charged ions held together by strong electrostatic forces. Ionic compounds all are electrolytes .
Properties of Ionic compounds They are solids with high melting points They are crystalline in nature They conduct electricity. Examples are NaCl, KCl, etc.Therefore, the hard substance that has a high melting point and is a poor conductor of electricity in the solid phase could be NaCl.
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