Answer: Beryllium is the fourth element with a total of 4 electrons. In writing the electron configuration for beryllium the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the remaining 2 electrons for Be go in the 2s orbital. Therefore the Be electron configuration will be 1s22s2.
Explanation:
Orbital notation represents an atom of beryllium in the ground state is [tex]1s^22s^2[/tex].
Beryllium atom:Beryllium is the fourth element with a total of 4 electrons. Beryllium atoms have 4 electrons and the shell structure is 2.2. The ground state electron configuration of ground state gaseous neutral beryllium is [tex][He] 2s^2[/tex]. The ground state of an electron, the energy level it normally occupies, is the state of lowest energy for that electron. Beyond that energy, the electron is no longer bound to the nucleus of the atom and it is considered to be ionized. Electron configuration for beryllium the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the remaining 2 electrons for Be go in the 2s orbital.
Therefore, the Be electron configuration will be [tex]1s^22s^2[/tex].
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A 200.0-mL sample of helium gas is in a cylinder with a movable piston at 110 kPa and 275 K. The piston is pushed in until the sample has a volume of 95.0 mL. The new temperature of the gas is 310. K. What is the new pressure of the sample? a)51.1 kPa b)261 kPa c)249 kPa d)274 kPa
Answer:
Option B. 261 KPa.
Explanation:
From the question given above, the following data were obtained:
Initial volume (V1) = 200 mL
Initial pressure (P1) = 110 kPa
Initial temperature (T1) = 275 K.
Final volume (V2) = 95 mL
Final temperature (T2) = 310 K
Final pressure (P2) =?
The new pressure (P2) can be obtained by using the following formula as illustrated below:
P1V1 /T1 = P2V2 /T2
110 × 200/275 = P2 × 95/310
22000 / 275 = P2 × 95/310
80 = P2 × 95/310
Cross multiply
80 × 310 = P2 × 95
24800 = P2 × 95
Divide both side by 95
P2 = 24800/95
P2 = 261 KPa.
Thus, the new pressure of the gas is 261 KPa.
n the Bohr model of an atom (shown), protons are represented in blue, the neutrons are red and the electrons are green. Use your periodic table and determine which of the following atoms is represented by the Bohr model.
Answer: B
Explanation: Valence electrons are the number of electrons out the outermost shell of the diagram. In this diagram, there is one valence electron. This means that it is highly reactive since the shell is not complete and needs other elements to be able to complete the outermost shell. If this model had a full outermost shell, then it would not be reactive (noble gases).
Answer: B
Explanation:This test it anoying.
A. O CN
B. O NH4+
C. O s2-
D. O Cro 2-
Which of the following is an oxyanion?
What does the weight of an object depend on?
Time taken for an event to occur
Temperature of the object
Force of gravity
Atmospheric pressure
Answer:
c .force and gravity hope this the right answer
YALL can you please answer this
Write a balanced chemical equation for the reaction that occurs when calcium metal undergoes a combination reaction with O2(g).
Answer:
CaO[tex]_{s}[/tex]
Explanation:
The chemical reactants are;
Calcium metal = Ca[tex]_{s}[/tex]
Oxygen gas = O₂[tex]_{g}[/tex]
Now let us write the reaction:
2Ca[tex]_{s}[/tex] + O₂[tex]_{g}[/tex] → 2CaO[tex]_{s}[/tex]
The product is CaO in solid form.
This reaction is a combination or synthesis reaction in which two substances combine to give a single product.
The outer shell of this element was determined as illustrated here.
It must be a _____.
What is the chemical formula for the compound ammonium phosphate? Use the list of polyatomic ions and the periodic table to help you
answer.
OA. NH4H2PO4
OB. (NH4)2PO4
OC (NH)3PO4
OD. (NH4),PO4
Answer:
NH4)3PO4
this is a filler: jsjdkflflflsojsskksdnfkdod
What does chlorophyll absorb during photosynthesis?
O A light
O B. oxygen
O c. carbon dioxide
D. sugar molecules
Which of the following atoms has the largest radius
F
I
Cl
Br
Answer:
francium
Explanation:
Atomic radii bary in a predictable across the periodic table.
The atomic radius elements increases down a group. Hence in the halogen group the last element in the group that is I have the largest radius.
What is atomic radius?Atomic radius is the distance is the distance from the nucleus to the valence orbital. The atomic radius depends on the electronegativity and number of electrons in the atom.
In periodic table, atomic radius decreases from left to right because, the electronegativity that is the ability of atomic nucleus to attracts its electron increases and thereby the atoms shrinks.
Down a group the number of shells increases and thereby electrons are more screened from the nuclear attractive pulling. Therefore in the group from fluorine, chlorine, bromine and iodine, iodine has the less electronegativity and thus largest radius.
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What makes atoms electrically neutral?
Devonian Period: When was this? Why is this significant?
Answer:
I HOPE IT HELPED THANKS
A dachshund walked 20 meters in 30 minutes. Calculate the speed. Provide your
answer in meters per hour.
Need help fast please I am timed and giving 47 points.
Four groups of students plan scientific investigations to answer four questions for the science fair.
Questions for Science Fair:
1-What kinds of plant life grow naturally in the town parks?
2-Which types of treats do different breeds of dogs like best?
3-Do different types of grass affect how far a ball rolls?
4-How are the chemicals in different vegetables similar?
Which question would most likely be answered with an experimental investigation?
A-1
B-2
C-2
D-4
Answer:
C
Explanation:
Answer:
C - 3
Explanation:
This can be actually tested
UCI Chemistry researchers, Prof. F. Sherwood Rowland and Dr. Mario Molina werefirst to discovered in 1973 that chlorofluorocarbons (CFCs) were depleting the Earth’sozone layer when released into the atmosphere. Once they reach the stratosphere, Clis released from the CFCs molecules by interaction with UV light. Free Cl atoms areable to react with ozone in a catalytic cycle that converts O3into the more stable O2.It is estimated that a single Cl atom is able to react with∼100000 O3molecules.Although CFCs production was banned in 1996, there are still a substantial numberof motor vehicle air conditioners (MVACs) that use CFC-12 (CF2Cl2) as refrigerant.The average CFC-12 emission rate from operating MVACs has been estimated tobe 59.5 mg per hour per vehicle (Zhang et al.Environ. Sci. Technol. Lett.2017).How much chlorine, in kg, is added to the atmosphere in a year due to 100 millionMVACs using CFC-12 as refrigerant?
Answer:
15.27895 x 10⁶kg of chlorine radical is added to the atmosphere in a year due to 100 million MVACs
Explanation:
Chlorofluorocarbons (CF₂Cl₂) from refrigerants produce chlorine radicals according to the following equation
CF₂Cl₂ → CF2Cl + Cl ⁻ .........(1)
From equation 1, one mole of CF₂Cl₂ produces one mole of Chlorine radical
From the question,
The emission rate of CF₂Cl₂ is 59.5mg/hour/MVAC
In one day the emission rate would be 59.5 x 24hours
= 1428mg/day
In one year, the emission rate would be 1428mg/day x 365days
= 521220mg/year
= 521.220g/year/MVAC
Therefore the emission rate for 100 million MVAC using CF₂CL₂ in a year is
= 52122 x 10⁶g/year/MVAC
= 52122 x 10³kg/year/MVAC
The molar mass of CF₂CL₂ = 120.913g/mol
No of moles of CF₂CL₂ = mass/ molar mass
= 52122 x 10⁶g / 120.913g/mol
= 431 x 10⁶ moles of CF₂Cl₂
From equation 1, since one mole of CF₂Cl₂ produces one mole of Chlorine radical, it implies that
431 x 10⁶ moles of CF₂Cl₂ would produce 431 x 10⁶ moles of chlorine radical,
Therefore, to find the mass of chlorine radical produced, we use the formula
No of moles of chlorine radical = mass/ molar mass
431 x10⁶ moles = mass of chlorine radical /molar mass of chlorine radical
431 x 10⁶ moles = mass/ 35.45g/mol
mass of chlorine = 431 x 10⁶ moles x 35.45 g/mol
= 15278.95 x 10⁶ g
In Kg, the mass = 15,278.95 x 10³kg of cholrine radical
= 15.27895 x 10⁶ Kg of chlorine radical
which of the nonmetals is the least reactive?
a) Ne
b) O
c) Cl
d) F
Flourine
Explanation:
The element F has a high negative (ΔeqHө) but not so high IE1 . Therefore, it is the least reactive non-metal.
Almost all of Earth's atmosphere is created through the process of photosynthesis.
True
False
Answer:
False
Explanation:
Discuss the difference between renewable and non renewable resource and give and example of each
Will get brainliest for the best example!!!!!!!!!!!!!!!!!
Answer:
Nonrenewable energy resources, like coal, nuclear, oil, and natural gas, are available in limited supplies. ... Renewable resources are replenished naturally and over relatively short periods of time. The five major renewable energy resources are solar, wind, water (hydro), biomass, and geothermal.
Explanation:
Answer:
I am answering so the other guy can get brainliest: Renewable sources are sources that are *near-infinite (because the sun will eventually die one day) that are basically not depleted when used. Nonrenewable sources are sources that deplete when you use them, which are not easily replaceable. An example of a renewable resource is Solar Energy or Hydropower, a non-renewable source is fossil fuels or natural gas.
Explanation:
How many grams are in 44.8 liter of oxygen gas
at STP?
Answer:
Pressure= 2 atm
temperature= 273K
volume= 44.8cm
3
=44.* litre
so,By PV=nRT
n=
RT
PV
mole=
0.0821×273
2×44.8
so, no of moles= 3.998=4
hence, 4×6.023×10
23
=24.08×10
23
Explanation:
if this answer is correct make me as brainlelist
At STP, one mole of every elements or molecules contains a volume of 22.4 L. Hence, a volume of 44.8 L of oxygen gas is 2 moles thus weighs 64 g.
What is STP condition?STP is the condition of standard temperature and pressure. A temperature of 298 kelvin and 1 atm pressure is referred to as standard temperature and pressure or STP.
At standard temperature and pressure, one mole of every compound or molecule contains 22.4 liters of the substance. We know that one mole of O₂ gas is 32 g/mol. 32 g of oxygen gas contains 22.41 liters.
The number of moles of 44.8 liters of oxygen is = 44.8/22.4 = 2 moles.
One mole of oxygen gas is 32 g. Hence, 2 moles are 64 g. Hence, the mass in grams of 44.8 oxygen is 64 g.
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This chemical equation represents a chemical reaction.
NaCN + HBr + NaBr + HCN
Which two chemicals are reactants in the chemical reaction?
A.NaCN
B.NaBr
C.HCN
D.HBr
Answer: NaCN and HBr
Explanation:
5. A family is traveling using three different modes of transportation. Seven of them travel in a large recreational vehicle, two in a car, and one on a motorbike. They start from the same place, travel at the same speed, and reach the final destination at the same time. *
Answer:
All three vehicles have the same kinetic energy because they have equal speed.
I just need to know which ones are insulators and the others conductors
Answer:
below
Explanation:
Insulators: wood, tire, glass cup, wool hat
Conductors: frying pan, penny, wire
I need help with this, Please help.
Answer:
b
Explanation:
I know the answer is B hope this helps
Why do elements form an ionic bond
Answer:
none of the above
Explanation:
Why is the wavelength of 633 nm used to analyze the standard solutions and drink samples?
Answer:
Corresponding with orange light, is the wavelength that blue solutions absorb the most.
Explanation:
If light is diffused through a solution of a given color, emerges of light from another wavelength is consumed and fades away. However, the wavelength of light relating to the color of such a solution is transferred. The color of the light is consumed is usually the contrasting one being transferred. As seen in a color wheel where, blue complement orange, red complement green, and yellow complement violet.
Thus, for a blue substance in solution, its complementary color is said to be orange, Given that the wavelength of orange color varies from 600 - 640 nm where it's maximum absorbance is approximately 633 nm. This wavelength is what is employed when analyzing the standard solutions and drink samples.
If the molecules of a substanace spread out compltely to fill the entire shape of any container the substance is placed in , the substance is probly a
Answer:
Gas.
Explanation:
Matter can be found in nature in three states: solid, liquid, and gas. The main difference between these three states is the separation of its molecules.
A solid has a definite form, its molecules are closely packed together and there is little to no movement between each molecule. When put in a container, it retains its form.
A liquid does not have a definite form, its molecules can move past another and they are not as close as in a solid, but it is not as loose either. When put in a container, it takes the shape of the container but it has a defined surface.
A gas does not have a definite form, its molecules are totally free from one another and the distance that separates them is much larger than the size they have. When placed in a container, they spread out completely and fill the entire shape of the container.
Label B-L in the diagram below
Answer:
B. Polar Easterlies
C. Sub polar low
D. Prevailing westerlies
E. Sub tropical high
F. Tropical easterlies
G. Inter tropical convergence zone
H. Tropical easterlies
I. Sub tropical high
J. Prevailing westerlies
K. Sub polar low
L. Polar easterlies
Explanation:
What causes uneven heating on Earth? *
Temperature Differences
Earth's Rotation
Earth's Revolution
Global Wind System
if u get it right i will give brainliest
Answer:
temperature differences
Explanation:
Solar heating of the Earth's surface is uneven because land heats faster than water, and this causes air to warm, expand and rise over land while it cools and sinks over the cooler water surfaces. ... Wind is the result of pressure changes in the atmosphere.
What will happen to the acquired energy of the ruler when you released its bent end?
Answer:
When the Ruler is bent the energy stored in it will be potential energy, When the ruler will be released this potential energy will be then converted into the Kinetic energy as a result the ruler will move Vibrations.
The energy conservation law can be applied here
K1 + U1 = K2 + U2
K1 - initial kinetic energy
U1 - Initial potential energy
K2 - final kinetic energy
U2 - final potential energy
Energy is known commonly as the ability to do work or move a matter. The type of energy that is stored is called potential energy.
So a bent ruler often has higher energy than a flat ruler. If the ruler moves, it is having an some form of kinetic energy and thus a flying bent ruler is having higher amount of energy than the one that is not bent.if the ruler is released at the bent end, the object or pebbles on it will fly. If you hold two positive charges near each other, they have potential energy because they will move if you release them.
If the object released is fired straight up into the air, it begins with a high kinetic energy. As it rises, it slows down due to the force of gravity pulling it toward the earth.
Due to the release, the object place on the ruler rises, its gravitational potential energy is therefore increasing and its kinetic energy is decreasing.
When the object reaches the top of its arc, it kinetic energy is zero and its potential energy is maximum.
Then gravity still to pull the object down the earth and the object will fall toward the earth and just as it falls down, its speed increases and its height decreases.
So, its kinetic energy will thus increases as it falls and its potential energy decreases.
When the object has returns to its original height, its kinetic energy will be the same as when it started upward.
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Which property can be used to tell gold and pyrite apart?
O A. Color
O B. Conductivity
C. Shininess
D. Malleability
Answer:
D. Malleability
Explanation:
Gold is made up of the element Au and it is a metal.
Pyrite is iron sulfide and it is a non-metal.
They have very similar appearance to such an extent that pyrite is widely called the fool's gold. To distinguish between the two, we simply explore their metallic properties. Gold is malleable. Pyrite is not. It will crumble under pressure.Which scientist is known for developing the planetary model of the atom
Answer:
Ernest Rutherford
Explanation:
The Rutherford model, proposed originally in 1911, dipicts a planetary model of the atom in which there is a nucleus and electrons circling it.
Answer:
Niels Bohr
Explanation: