Answer: They combined to form molecules.
Explanation:
That statement that describes atoms in Group 18(8A) are inert is "they have a full valence shell."
What is chemically inert?A substance that is not chemically reactive is referred to as chemically inert.
When elements react, their atoms lose, gain, or share electrons to complete their outer shells. Noble gas atoms already have entire outer shells, therefore they don't inclined to lose, gain, or share electrons. This is why noble gases are chemically inert and do not participate in reactions.
When atoms bond, they try to form an octet by transferring or sharing valence electrons in the case of ionic bonds and covalent bonds, respectively. There is no incentive for group 18 atoms to bond because they already have an octet of valence electrons.
As a result, the noble gases belong to the periodic table's group 18. They are nonmetal elements with a full shell of valence electrons that are chemically inert, colourless, and odourless. We can see that helium (atomic number 2) has a full shell of two s electrons if we look at the electron configurations.
Hence the correct option is D.
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Which equation is balanced? “Hint...count the atoms of each element. Only compare like elements!
Answer:
2Mg + O2 = 2MgO
Explanation:
Al + 3F2 = AlF3 ..... F has 6 on the left and 3 on the right.
Na + F2 = 2NaF ..... Na has 1 on the left and 2 on the right.
2Al + 3O2 = Al2O3 .... O has 6 on the left and 3 on right.
Which would result in the most diverse offspring?
Bees bringing pollen from the flower of one plant to the flower of another plant.
A bacteria cell reproducing through asexual reproduction.
An orchid with a flower structure that can pollinate itself.
Planting a cutting from a potato to grow a new potato plant.
Answer:
B
Explanation:its the best answer
The most diverse offspring is produced when bees bringing pollen from the flower of one plant to the flower of another plant where, the new flower made will show a characteristic of both plants?
What is pollination?Pollination is the process of transferring pollen grains from the anther of the flower to the female stigma portion. This is a mechanism to create offsprings of the plants.
Pollination can be occurred through various agents such as insects, wind, water etc. Some plants contains both male and female flower within it and those are self pollinating.
Bees and butterflies are the main pollinating agents for plants. When they bring the pollen grains from one plant to another plant's flower the resulting offspring will have diverse properties which are mix of each plants.
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A student collected a sample of a gas in a 220 mL gas bulb until is pressure reached 0.757 atm at a temperature of 25.0 . The sample weighed 0.299g. What is the molAR mass of the gas?
Answer:
43.84 g/mol
Explanation:
We use the ideal gas law to find the number of moles of gas present.
So PV = nRT where P = pressure of gass = 0.757 atm, V = volume of gas = 220 mL = 0.22 L, T = temperature of gas = 25 °C = 273 + 25 = 298 K and R = molar gas constant = 0.082 L atm mol⁻¹K⁻¹.
So, n = PV/RT = 0.757 atm × 0.22 L/(0.082 L atm mol⁻¹K⁻¹ × 298 K) = 0.16654 L atm/24.436 L atm mol⁻¹ = 0.00682 mol.
Since mass of gas m = 0.299 g
and n = m/M where M = molar mass of gas
So, M = m/n
\= 0.299 g/0.00682 mol
= 43.84 g/mol
So, the molar mass of the gas is 43.84 g/mol
How many moles are equal to 89.23 g of calcium nitrate?
Answer:
23
Explanation:
According to the mole concept, there are 0.541 moles which are equal to 89.23 g of calcium nitrate.
What is a mole?A Mole is defined as the unit of amount of substance . Mole is the quantity which is a measure of amount of substance of how many elementary particles are present in a given amount of substance.
Mole is defined as exactly 6.022×10²³ elementary entities. The elementary entity can either be a molecule, atom or an ion depending on the type of substance in which it is present. Amount of elementary entities present in a mole is called as Avogadro's number.
Mole is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For many of the the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound which is measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
Number of moles = mass/molar mass= 89.23/164.88=0.541 moles.
Thus, there are 0.541 moles which are equal to 89.23 g of calcium nitrate.
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Can someone please help me ? Click the picture
Explanation:
Keq =[NO2] ^2 / [N2 O4]
4.64 x 10^-3
what 2 elements are in the same group?
Sodium and Calcium
Fluorine and Neon
Chlorine and Bromine
Carbon and Aluminum
Answer:
Chlorine and Bromine are in the same group
Answer:
I think fluorine and neon
2. In pigeons, the allele B produces ash-red feathers. The allele b produces
blue feathers. The B allele is dominant to the ballele. A pigeon with
genotype Bb is crossed with a pigeon with genotype bb. What percent of
the offspring are expected to have ash-red feathers?
A. 0%
B. 25%
C. 50%
D. 100%
Answer:
it is C
Explanation:i had this on my test and got it right lol
___________ is a characteristic of a substance that's observed during a chemical reaction. *
physical property
physical change
chemical property
chemical change
What period has the highest ionization energy?
Answer:helium or the noble gases
Explanation: The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest ionizing energy
What is the frequency of radiation whose wavelength is 2.25 X 10^-5cm?
Answer:
1.25 x 10^15Hz
Explanation:
c = frequency x wavelength
c is the speed of light, which is equal to 3.00 x 10^8 m / s
frequency = c /wavelength
= (3.00 x 10^8m /s) / (2.40 x 10^-5 cm x 1 m /100cm)
= (3.00 x 10^8 m/s) / 2.40 x 10^-7m
= 1.25 x 10^15/s 1 / s = 1Hz
So, the Frequency = 1.25 x 10^15Hz
I hope this helped :)
Another source of energy is nuclear energy. Nuclear energy is the energy in the nucleus of an atom. We can release this energy and use it to make electricity. In this project, you will research nuclear energy.
OBJECTIVES
Research nuclear energy and its use for generating electricity.
Directions
Use the library, internet, and other educational resources to research nuclear energy.
Write a three-paragraph report on what you have learned. Be sure to include the uses of nuclear power, how it is generated, and the impact it has on the environment. Also, answer the question, "Is nuclear energy renewable?"
Yes.Nuclear energy is renewable
Before J.J. Thomson began gathering evidence about electrons in 1897, what did scientists know about atoms?
Answer: Scientists generally thought atoms were the smallest particles that could not be broken down any further.
Explanation: Trust me
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Scientists generally thought atoms were the smallest particles that could not be broken down any further.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.
Before J.J. Thomson began gathering evidence about electrons in 1897. Scientists generally thought atoms were the smallest particles that could not be broken down any further.
Therefore, Scientists generally thought atoms were the smallest particles that could not be broken down any further.
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How do you determine the number of neutrons in the Bohr Model
Answer: There are many ways. (Check Explanation)
Explanation: Electrons are found outside of the nucleus. Now in the middle of the nucleus there are protons in neutrons. The way to determine the number of neutrons in the Bohr Model are many ways.
Number one, if the neutrons, protons, and electrons were color coded, take away the electrons and you are left with the 2. Then find out which color corresponds to the neutron.
If it isn't color coded, then the protons and electrons should usually be marked with either + or - on it. The one without any of this and that is in the nucleus is the neutron. Last but not least, on some of the models, it can show many protons or neutrons are in the nucleus. For example the potassium bohr model. (Check image) On here, 19+ means 19 protons and 20N means 20 neutrons.
KBr + AgNO3 → AgBr + KNO3
Which two chemicals are products in the chemical reaction?
Answer:
Products are AgBr and KNO3
John is outstanding forward on his club select soccer team. He is know for his ball control and speed. After a game he often makes a sketch of moves that were successful. The dotted line on his sketch shows the direction the ball was moving before he kicked it.
Answer:
This self evaluation helps them to better his sport.
Explanation:
This is the right way to evaluate the performance of John because this sketch shows him the way he perform in the match. Due to this sketch he can better his performance and remove all the mistakes he had done in the match which results in better performance of John in the next match. This self evaluation helps them to better his sport and got new chances in order to select for a better club or national soccer team.
How are ionic bonds and metallic bonds different from each other?
Include: what occurs with electrons in each type of bond? How/why the atoms are attracted (bonded) to each other?
Answer:
Ionic bond is bond between a metal and non metal , metallic bonding happens between positive metals ions and negative electrons in a metal
Explanation:
ionic Bond is the transfer of electrons between a metal and non metal due to strong electrostatic force of attraction between positive metal ions and negative non metal ions
in metallic bonding , there is a force of attraction between positive metal ions and the sea of electrons surrounding it
I have science and i have a question that says : an element is a (valuable, pure , rare) substance that is not chemically combined with any other elements
Answer:
It’s true ( pure).
Explanation:
An element is defined as a pure substance that is not chemically combined with any other elements. An element comprises of mainly the sane type of atoms.
While a compound is a substance that consists of two or more elements which are chemically combined together. This is the main difference between an element and a compound.
21.If the anion in an ionic compound is a nonmetal, you must change its ending
-ate
-ite
-ide
Answer:
-ite --> Anionite
Explanation:
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Have an awesome day!
Which of these is an example of mutualism
Answer:
B.
Explanation:
Mutualism is the idea that both organisms benefit from an interaction. In example B, the honeybee benefits because they receive nectar, while the flower benefits in being pollinated.
Alkaline earth metals are elements present in the second group of the periodic table.
True or false
Answer:
True
Explanation:
Alkaline earth metals are found in the second group on the periodic table. They are made up of elements:
Beryllium
Magnesium
Calcium
Strontium
Barium
Radium
These elements have two valence electrons in their outer most shell. Together with group one elements they are s-block elements.
Group one elements are called Alkali metals. Certain periodic properties trend across the group.James mixed Barium and oxide. what does he get? how does it work?
Answer: Barium Oxide
We know that:
James mixed Ba + O²
Now, let's see what will happen when he does mix it.
The Barium will give it's electrons up to the oxide.
The Oxide and Barium will both reach noble gas status.
In the end, James will get Barium Oxide.
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HELP PLEASE!! This might be an easy question for some!!! WILL LOVE YOU 4EVER!!!
Increasing concentration increases the number of collisions and decreases the reaction rate.
True
False
Answer: False
Explanation: Increasing the concentration of a reactant increases the frequency of collisions between reactants and will, therefore, increase the reaction rate
y’all pls help me with this I’m literally so done
Answer:
Explanation:
I can help you
what is the difference between groups and periods on the periodic table.? What do they tell you?
.Answer:
Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period.
Explanation:
6th grade science i mark as brainliest
Which type of wave is this?
Answer:
A Transverse Wave
The columns in the periodic table are called
groups/families
O periods
O valence electrons
nucleus
Experiment: finding absolute zero experimentally
Complete the following analysis and conclusion and submit below.
1. Calculate the Kelvin temperatures of the water and record your answers in the data table.
2. Find the change in the volume of air in the flask from your data and record in data table.
3. Use the equation V 1 / T 1 = V 2 / T 2 to calculate the expected volume of air when cooled in tap water.
4. How do the expected final volume and the actual final volume compare?
5. What is the significance of elevating or lowering the flask until the water level in the flask is even with the water level in the beaker or container?
6. Construct a graph of the data. Plot the volume of the gas at room temperature in tap water and in ice water on the y axis. Plot the Kelvin temperature on the x-axis. Print out graph paper for your plot.
7. Extend the plotted line downward until it crosses the temperature axis. This process of extending a graph beyond the experimental data is called extrapolation.
8. At which temperature is the line predicted to cross the x-axis?
9. At which temperature did the line actually cross the x-axis?
10. Account for any deviation between the predicted temperature line extrapolation and the actual line extrapolation.
11. Real World Chemistry - Explain why bottled gas containers are equipped with a relief valve?
Answer:
When mensuration volume of air within the flask at the primary temperature, a volume of 250mil was recorded, referred to as V1. The temperature of the air within the flask in boiling water was recorded as 99ᵒC, referred to as T2. so as to seek out the right calculations, 99ᵒC must be born-again to Kelvin by adding 273.
the primary temperature in Kelvin is 372K. the worth of V1/T1, may be found by swing 250/372. This involves a complete of zero.67. the quantity of the air within the flask of the second temperature was 177 mil, referred to as V2.
The temperature of the air within the cooled flask is 7ᵒC, referred to as T2. 7ᵒC must be born-again to Kelvin by adding 273 that involves a final total of 280K. the worth of V2/T2, found by swing 177/280 involves a complete of zero.63.
The close to equality in numbers may be attributed to Charles Law. Charles Law states that “as the temperature will increase, thus will the quantity of a gas sample once the pressure is command constant”.
The results of V1/T1 and V2/T2 were terribly on the brink of one another. this can be because of the very fact that this experiment was worn out as a closed system. In Charles Law, if there's a closed system the 2 ratios ought to have equal numbers. {this is|this is often|this may be} why it can be expected for the magnitude relation numbers to be terribly equal.
All of the following are landforms that can contribute to climate EXCEPT
A. Volcanoes
B. Mountains and shorelines
C. Mountains
D. Iceberg
Here are the energy levels in a fantasy hypothetical hydrogen-like atom. (You cannot use the Rydberg constant, 2.18 x 10-18 J, for this problem, therefore). What is the frequency of a photon that is absorbed when an electron goes from level 2 to level 4? Energyn = 4 -2.10 x 10-19 Jn = 3 -3.20 x 10-19 Jn = 2 - 5.20 x 10-19 Jn = 1 - 9.80 x 10-19 J
Answer:
4.7 x 10^14 Hz
Explanation:
From Bohr's theory, the energy absorbed or emitted (ΔE) by an atom transiting from one energy level to another is given as;
ΔE = E4 - E2
Where;
E4 = energy corresponding to the energy level n=4
E2 = energy corresponding to the level n= 2
ΔE = (-2.10 x 10-19) - ( - 5.20 x 10-19)
ΔE =3.1 x 10-19
But
ΔE = hf
h = Plank's constant
f= frequency of photon absorbed
f = ΔE/h = 3.1 x 10-19/6.6 x 10-34
f = 4.7 x 10^14 Hz