Answer:
Atomic and ionic size –
As the atomic number increases, the atomic size increases and effective nuclear charge also increases which attracts the outermost shell more effectively. So, as we move left to right means from actinium to lawrencium in the actinide series, there is gradual decrease in the the atomic or ionic radii with increase in atomic number. This steady decrease I atomic size is called actinide contraction. The actinide contraction is analog to the lanthanide contraction.
Cause of Actinide contraction –
The main reason of the actinide contraction is the imperfect shielding of the one 5f-electron by another 5f- electron in the same shell. Due to poor shielding effect of the 5f electrons, effective nuclear charge increases which causes the contraction in atomic size. When one electron is added to the 5f-orbital every time means proton keeps on increasing due to which the nuclear charge increases irregularly which causes the poor shielding effect.
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1. Electricity is a form of energy created by the free or controlled
movement of charged particles such as electrons.
True
False
Answer:
true
Explanation:
Why is an electron ejected when green light hits the metal?
Explanation:
If a large photon strikes the surface, that has enough strength to take out an electrode, which will then travel to the positive side since it is negative. Current is flowing at this stage. Since the reduced photons will be unable to distinguish between atoms, no power can pass.
Which change will cause more CO2 to form in a closed container?
Answer:
it would be E. because it would create steam from the h2o
help w this please and thank you.
Answer: see below
Explanation: filling the blanks in this order
point source
Pollution
Wastewater
waste
Nonpoint source
Contaminants
fertiliser
suburban yards
how Is disaccharide is hydrolyzed into monosaccharides
What is the molecular formula of the product formed from the oxidation of 2-methyl-2,3-pentandiol with Jones reagent (CrO3, H , H2O)
Answer:
C6H12O2
Explanation:
The Jones reagent is a reagent in organic chemistry used to convert primary alcohols to carboxylic acids and secondary alcohols to ketones. Recall that tertiary alcohols can not be oxidized.
The compound 2-methyl-2,3-pentandiol contains one secondary and one tertiary alcohol. The secondary alcohol is oxidized to a ketone while the tertiary alcohol is not oxidized.
Hence the product of the oxidation using Jones reagent is 2-Hydroxy-2-methyl-3-pentanone with the molecular formula C6H12O2.
How many moles are in 175 L of Ar?
OA) 7.81 mol
O B) 3920 mol
OC) 4.38 mol
OD 6991 mol
What type of mutation occurred?
Original: ATT CAC
Mutated: ATT TCA C
substitution (point)
insertion (addition)
deletion
Answer:
insertion (addition)
Explanation:
A T was added, making the sequence shift.
Do you think the ingredients changing into a cake
in the oven are a chemical reaction? Explain why you
think baking a cake is or is not a chemical reaction.
The half-life of the radioactive isotope polonium-218 is 3.05 minutes.
How long will it take for the activity of a sample of polonium-218 to decrease from 2.81E4 Ci to 3.52E3 Ci?
Answer: It will take 9.13 minutes for the sample.
Explanation:
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 = [tex]2.81\times 10^4[/tex]
a - x = amount left after decay process = [tex]3.52\times 10^3[/tex]
a) for completion of half life:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]
[tex]k=\frac{0.693}{3.05min}=0.227min^{-1}[/tex]
b) for activity to decrease from 2.81E4 Ci to 3.52E3 Ci:
[tex]t=\frac{2.303}{0.227}\log\frac{2.81\times 10^4}{3.52\times 10^3}[/tex]
[tex]t=9.13min[/tex]
Thus it will take 9.13 minutes for the sample.
[tex]t_{99.9}=40min[/tex]
The time after which 99.9% reactions gets completed is 40 minutes
Advantages and disadvantages of Reversible Fuel Cell..
Answer:
Hydrogen fuel cells do not produce any CO2 emissions during operation, even if their production is not necessarily carbon-free. This gives them an advantage over combustion engine vehicles, which can emit small amounts of poisonous carbon monoxide and require well-ventilated rooms for indoor use.
Given the following unbalanced equation:
_____ CoCl2 + _____ F2 à _____ CoF2 + _____ Cl2
If you are given 11.84 mole of CoCl2, how many moles of CoF2 will be produced?
Answer:
11.84 moles
Explanation:
We first balance the chemical equation
[tex]CoCl_{2} + F_{2} ------> CoF_{2} + Cl_{2}[/tex]
Both number of elements in the reactant side is equal to elements on the product side thus this equation is already balanced
Using mole ratio to find moles of [tex]COF_{2}[/tex]
1 mole of CoCl2 reacts with 1 mole of F2 to produce 1 mole of CoF2 and ! mole of Cl2
Mole CoCl2 = Mole CoF2 = 11.84 moles
Single, double, or triple covalent bonds in a carbon atom are formed from A) inner shell electrons B) valence electrons. C) both inner shell and valence electrons.
Answer:
B) valence electrons.
Explanation:
Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.
For example, oxygen has a total number of eight (8) electrons while neon has total number of ten (10) electrons. Therefore, an atom of oxygen is able to gain (receive) two (2) more electrons in order to have the same electron arrangements as the noble gas i.e an atom of neon with an atomic number of 10.
Basically, each free electrons (valence electrons) produces a covalent bond.
Hence, single, double, or triple covalent bonds in a carbon atom are formed from valence electrons.
Single, double, or triple covalent bonds in a carbon atom are formed from Valency electrons.
The valency electron are the electrons found in the outermost shell of an
atom.
The valency electron of an atom determines the kind of bonding that exist in
an element .
Neutral Carbon atoms has 6 electrons . The number of valency electrons
(electrons in the outermost shell) in Carbon is 4 valency electrons.
So, carbon can form covalent bond by sharing electrons with other atom of
an element. The bonding maybe single, double or triple bonds .
This bonding are formed by the electrons in the outermost shell(valency electrons)
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“Sound plays an important role in our lives”. Give two points in support of this statement.
Answer:
First job out of college was in an industrial manufacturing setting. Was told by plant engineer to walk around, get used to normal sounds. He stressed anything "abnormal" is a noise more so than a sound. Report abnormalilies to supervisor immediately!! So essentially sounds are giving us warnings something is abnormal.Sounds also provide feedback. Say you are performing an experiment, requires boiling water to sanitize. Start the burner under a vessel, go on about other preparations. Sound of water boiling will trigger setting a timer for how long to let it boil.Get off work, pleasant music, nature sounds can help us decompress from a stressful day on the job.Hope some of these give you impetus to think of other bullet points, sounds good to me. !!
Explanation:
What is Trinitrogen hexaflouride formula
Answer:
N3F6
Explanation:
Tri- means three so three nitrogens and hexa- means six so six flourines.
Nitrogen and fluorine forms covalent compounds. The formula of one of their compound trinitrogen hexaflouride is N₃F₆.
What is covalent compounds?Covalent compounds are formed by the sharing of electrons between two atoms. Atoms which are electron deficient forms covalent compounds. The number of shared electron is based on the valency of each bonded atom.
Nitrogen is 7th element in periodic table and it have five valence electrons. Thus it needs 3 more electrons to attain stability. Fluorine is 9th element with 7 electrons in its valence shell and it needs one more electron to gain stability.
In the compound trinitrogen hexafluoride, there are three nitrogens and six fluorine. Each nitrogen shares one electron with fluorine and each fluorine in turn shares its one electron. Thus the formula of the compound is N₃F₆.
To find more about nitrogen compounds, refer the link below:
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what element is stored in the shells and skeltyons of living organisims?
Answer:
carbon
Explanation:
Many organisms use carbon to make calcium carbonate, a building material of shells and skeletons. Other chemical processes create calcium carbonate in the water. The using up of carbon by biological and chemical processes allows more carbon dioxide to enter the water from the atmosphere.
The infrared spectrum of the starting material (2-methylcyclohexanone) will have a peak present at ____________, which will be absent in the product (2-methylcyclohexanol).
Answer:
1710 cm^-1
Explanation:
The Infrared spectrum of the starting material will have a peak present at 1710 cm^-1. this is because
2-methylcyclohexanone has a ketone group (C=O) which will be reduced to an alcohol group (O-H), in the product i.e. (2-methylcyclohexanol). therefore the peak for the stretching vibration of the ketone carbonyl (C=O) is present only in the starting material only .and The peak for the stretching is at 1710 cm^-1
how do I solve this?
Answer:
Explanation:
When you divide exponentials, you subtract the powers. For the numbers infront, just use a basic calculator for.
7.95/6.02 = 1.32
10^22/10^23 = 10^-1
1.32 x 10^-1 is your answer
What is the subscript of Carbon in Isovaleric acid C5H10O2
Differences in air temperature and pressure cause movements of air also known as ?
Match each chemical reaction with the correct identifying type.
2 NaHCO3 (S )→ Na2CO3 (s) + H2O (g) + CO2 (g)
2 C8H18 (l) + 9 O2 (g) → 16 CO2 (g) + 18 H2O (g)
3 H2 (g) + N2 (g) → 2 NH3 (g)
Cu (s) + Ag2SO4 (aq) → 2 Ag (s) + CuSO4 (aq)
Pb(NO3)2 (aq) + 2 KI (aq) → PbI2 (s) + 2 KNO3 (aq)
Double Replacement Single Replacement Synthesis/Composition Decomposition Combustion
Identify which trends in the diagrams below describe
atomic radius, ionization energy, electron affinity,
and electronegativity
Explanation:
the atmoc radius across the period
Atom radius as you move form left to right the atomic in the period table atomic radius decrease do to decrease the number of shell and it causes the Electron closed to nucleus. and also cause to decrease the inozation engey, electronegative andelectro affinity....... in the group the atomic radius increase as you move down the group do to increase number of shell because the Electron are far-away to the nuclear and it causes the small amount of energy to ionization so that the ionization engey , electronaffity and electronegative are increaseAn object is travelling at a speed of 6500. cm per second. Convert the value to the following units (2.54 cm = 1 inch)
a. Kilometers per minute
b. Feet per hour
Answer:
3.900 km/min
7.677 × 10⁵ ft/h
Explanation:
Step 1: Given data
Speed of the object (s): 6500. cm/s
Step 2: Convert "s" to km/min
We will use the following conversion factors.
1 km = 10⁵ cm1 min = 60 s6500. cm/s × (1 km/10⁵ cm) × (60 s/1 min) = 3.900 km/min
Step 3: Convert "s" to ft/h
We will use the following conversion factors.
1 km = 3280.84 ft1 h = 60 min3.900 km/min × (3280.84 ft/1 km) × (60 min/1 h) = 7.677 × 10⁵ ft/h
how many moles are in 124.7 g of Ba(OH)2
Answer:
0.73 mol
Explanation:
No. of moles(n)= Given mass/molar mass.
Given mass=124.7g
Molar mass of Ba(OH)2= Molar mass of (Barium+2Oxygen+2Hydrogen)=137+32+2=171g
No. of moles= 124.7g/171g=0.73 mol
A 1.00 liter solution contains 0.31 M hydrocyanic acid and 0.40 M sodium cyanide. If 0.100 moles of barium hydroxide are added to this system, indicate whether the following statements are true or false. (Assume that the volume does not change upon the addition of barium hydroxide.)
a. The number of moles of HCN will remain the same.
b. The number of moles of CN will decrease.
c. The equilibrium concentration Of H3O+ will increase.
d. The pH will increase.
e. The ratio of [HCN]/ [CN-] will remain the same.
Explanation:
acid --> HCN
base --> KCN
now
another base NaOH is added
we know that
base will react with an acid
so
OH- + HCN ---> CN- + H20
we can see that
HCN is used up , so number of moles of HCN will decrease
CN- is being formed , so number of moles of CN- will increase.
A false
B false
C false
D true
E false
As of 2017, the tallest roller coaster in the world is the Kingda Ka, located at Six Flags Great Adventure in Jackson, New Jersey. It stands 139 meters tall and, at one point, the cars drop 127 meters! Roller coasters are a great way to investigate energy. Look at the diagram of a roller coaster below, and answer the following questions. At what point on the track does the car have the greatest potential energy?
Answer:
energy due to its velocity. We can compare potential and kinetic energy by considering a car on a hill. When the car is at the top of the hill it has the most potential energy.
For this PreLab assignment we will assume all of the acid is the monoprotic acid acetylsalicylic acid (C9H8O4). [Note: for your analysis in the PostLab you will subtract the moles of salicylic acid from the total acid content to determine the amount of acetylsalicylic acid]. How many moles of acetylsalicylic acid are in the 0.2001 g sample of your aspirin
Answer:
0.0011 moles
Explanation:
Recall that;
Number of moles = mass of substance/ molar mass of the substance
Mass of asprin = 0.2001 g
Molar mass of asprin = 180.158 g/mol
Number of moles = 0.2001 g/180.158 g/mol
Number of moles = 0.0011 moles
Hi! I need some solar system facts!
Answer: I can help with that!
Explanation: 1.The tremendous growth in the U.S. solar industry is helping to pave the way to a cleaner, more sustainable energy future. Over the past few years, the cost of a solar energy system has dropped significantly -- helping to give more American families and business access to affordable, clean energy.
Through a portfolio of R&D efforts, the Energy Department remains committed to leveraging America’s abundant solar energy resources -- driving research, manufacturing and market solutions to support widespread expansion of the nation’s solar market.
2.The amount of sunlight that strikes the earth's surface in an hour and a half is enough to handle the entire world's energy consumption for a full year. Solar technologies convert sunlight into electrical energy either through photovoltaic (PV) panels or through mirrors that concentrate solar radiation. This energy can be used to generate electricity or be stored in batteries or thermal storage.
Below, you can find resources and information on the basics of solar radiation, photovoltaic and concentrating solar-thermal power technologies, electrical grid systems integration, and the non-hardware aspects (soft costs) of solar energy. You can also learn more about how to go solar and the solar energy industry. In addition, you can dive deeper into solar energy and learn about how the U.S. Department of Energy Solar Energy Technologies Office is driving innovative research and development in these areas.
3.Solar radiation is light – also known as electromagnetic radiation – that is emitted by the sun. While every location on Earth receives some sunlight over a year, the amount of solar radiation that reaches any one spot on the Earth’s surface varies. Solar technologies capture this radiation and turn it into useful forms of energy.
19E molar/molal Test
A) 24 g
B) 36 g
C) 48 g
D) 60 g
Answer: b 36 g
Explanation: