The elements are placed in groups and periods on the contemporary periodic table, according to this definition. The elements are organized in the current periodic table in order of increasing atomic number. This periodic table has 7 periods and 18 groupings. Horizontal rows form the arrangement of the periods.
What is a periodic table?Chemistry is the branch of science that examines the characteristics, make-up, and structure of substances (specified as elements and compounds), as well as the changes they go through and the energy released or absorbed. Every substance, whether created through natural processes or through man made means, is made up of one or more of the roughly a hundred types of atoms that have been classified as elements.
According to the question, groups are :
Groups refers to the vertical rows.The periodic table has a total of 18 groupings.The distinction between the groups is made on the basis of valence electron count and degree of reactivity.All elements in the same group of elements have the same chemical behavior for their outermost electrons.To get more information about Periodic Table :
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Kai was 200 meters north of the library when he remembered he had to return some books to the library. It took him 200 seconds to do the round trip. Which best describes Kai's roundtrip?
Answer:
His speed was 2 m/s, and his velocity was 0
Explanation:
In physics, speed of an object is defined as the change in position with the change in its time. While velocity may be defined as the change in the position of the body with respect to the time taken.
Speed in a scalar quantity which means it has only magnitude while velocity has both magnitude and direction.
To determine change in velocity both direction as well as magnitude has to be changed.
In the context, Kai was 200 m of the library in the north direction. Now for the round trip to the library and back to his position, Kai took 200 seconds time to cover the distance.
So for the round trip, the speed of Kai would be 2 m/s abut the velocity of Kai is 0 as the displacement of Kai is 0.
Answer:
speed 2 m/s, his velocity 0
: B
How many atoms of Hydrogen are in 4 C3H5O12? (10 points)
Answer:
There are 20 atoms in hydrogen.
Explanation:
Multiply Coefficient with Hydrogens subscript. In this case the coefficient is a 4 so you multiply that with Hydrogens subscript which is 5. So it would be (4)(5)=20
If the pH is decreased from 7 to 6, it means that the
1..concentration of Hydrogen ions is 10 less
2...concentration of Hydrogen ions is 10 more
3.it is the same
Answer:2...concentration of Hydrogen ions is 10 times more
Explanation:
Why was it important to decide between the lunar orbit Rendezvous method and the earth orbit rendezvous method near the beginning of project apollo?
A. Engineers could not decide which method to use until they had built and tested the lunar miss vehicle.
B. Engineers could not start designing the spacecraft until they knew set of constraints to follow.
C.Engineers could not determine the goals of project apollo until they figured out how to get to the moon and return safely to earth?
what answer is it?!! pls answer fast!!!!
It was important to decide between the lunar orbit Rendezvous method and the earth orbit rendezvous method near the beginning of project Apollo because Engineers could not decide which method to use until they had built and tested the lunar miss vehicle and is therefore denoted as option A.
What is Apollo?This was a scientific exploration of the Moon in which instruments were deployed to measure the distance from the Moon to the Earth.
This was also set up in other to measure the Moon's seismic activity and involved the use of spacecraft but there was difficulty in selecting between the lunar orbit Rendezvous method and the earth orbit rendezvous method near the beginning of project Apollo.
This was because if the earth orbit rendezvous failed, the threatened astronauts could be brought back home easily while if a rendezvous around the moon failed, the astronauts would be too far away to be saved which is therefore the reason why option A was chosen as the correct choice.
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The tire pressure in a automobile tire was 2.38 atm when the tire was at 26°C. As the automobile drove for several hours, the temperature of the tire increased to 93°C.
35 atm
41.0 atm
2.91 atm
3.09 atm
33 atm
Answer:
The answer is 2.91 atm
Explanation:
In guinea pigs, the allele for a black coat is dominant over the allele for a white coat. What color is a guinea pig with one allele for a black coat and one allele for a white coat?
A.
black
B.
gray
C.
white
D.
black and white
Which of the following scenarios is a chemical reaction NOT taking place. Bobby notices that his bike rusted when left out in the rain over night.
Ann notices that the bread turned green over a long amount of time.
Timmy dissolves salt in warm water.
Betty colors her hair blond with bleach.
Answer:
got to be salt in warm water as for the bread it produces mold and also bleach is a chemical
which of the following will react with a solution of zinc sulphate fastest ?
A. Potassium
B. Aluminum
C. Magnesium
D. Copper
Answer:
C. Magnesium
Explanation:
Zinc sulphate (ZnSO4) will react fastest with Magnesium (Mg) because magnesium is more reactive than Zinc and other given elements.
Zinc sulphate (ZnSO4) reacts with Magnesium (Mg) and undergo displacement reaction. Zinc is displaced by magnesium and form Magnesium Suphate (ZnSO4).
ZnSO4 + Mg => MgSO4 + Zn
in the nineteenth century, theoretical and experimental scientists knew something was wrong with the energy of the electromagnetic spectrum because
Answer: According to the electromagnetic theory of the 19th century,
it had become clear that electricity and magnetism were related, and their theories were unified: wherever charges are in motion electric current results, and magnetism is due to electric current! Hope this Helps!
How do scientists write very large numbers?
O A. They divide all numbers by a constant to reduce the size.
O B. They round off all numbers to a few digits after the decimal.
O c. They simplify the numbers by deleting the exponents.
D. They express the numbers using scientific notation.
SUBMIT
Answer: its D
Explanation: i just got the question right
In scientific notation, often known as power-of-10 notation, extremely big and small numbers are written. Scientists write very large numbers by express the numbers using scientific notation.
What is scientific notation ?Numbers that are either too large or too little to be readily stated in decimal form can be expressed using scientific notation. It is also known as standard form in the UK and scientific form, standard index form, and standard form.
The main goal of scientific notation is to simplify computations using numbers that are abnormally big or tiny. The following examples demonstrate how all the digits in a number in scientific notation are relevant, since zeros are no longer utilized to set the decimal point.
When working with very big or very small numbers, scientists, mathematicians, and engineers employ scientific notation. Large and tiny numbers can be represented in a form that is simpler to read using exponential notation.
Thus, option D is correct.
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Which order shows decreasing wavelength?
gamma → ultraviolet → infrared → radio
infrared → gamma → radio → ultraviolet
radio → infrared → ultraviolet → gamma
ultraviolet → radio → infrared → gamma
Answer:
The answer is c radio --> infrared --> ultraviolet --> gamma
Explanation:
I just did it
Answer:
C
Explanation:
just did it
1. What kind of energy is inside the child on the bike?
Answer:
Cuando uno monta en bicicleta, el cuerpo convierte la energía química de los músculos para producir energía mecánica.
Explanation:
The speed (c) of a wave =
Answer:
the case of a wave, the speed is the distance traveled by a given point on the wave (such as a crest) in a given interval of time. In equation form, If the crest of an ocean wave moves a distance of 20 meters in 10 seconds, then the speed of the ocean wave is 2.0 m/s.
Explanation:
What type of reaction is shown below: Br2 + Kl 12 + KBr
Answer:Chemical reaction
Explanation:
The main concept that must be applied to determine the coefficients (amount of each item) is that there must be equal amounts of each element on each side of the equation. We are not destroying or creating new atoms. In this case, the unbalanced reaction formula is:
B
r
2
+
K
I
=
K
B
r
+
I
2
There are a two problems we need to solve before it will be balanced:
There are two moles of Iodine atoms (
I
) on the right side of the equation, while there is only one mole on the right side.
There are two moles of bromine (
B
r
) atoms on the left side, while there is only one on the right.
Since there are two moles of bromine atoms on the left side, we need two moles on the right as well. We can do this by adding a coefficient of two to the
'
K
B
r
'
term in the equation. Our now modified equation looks like this:
B
r
2
+
K
I
=
2
K
B
r
+
I
2
There is one mole of Iodine atoms on the left, and two on the right. To fix this, we add a coefficient of two to the
'
K
I
'
term. The resulting equation is below.
B
r
2
+
2
K
I
=
2
K
B
r
+
I
2
Bonus step: We can also put ones in front of the coefficient-less species. This is like changing a phrase from "an apple" to "1 apple". It is the exact same thing, but makes it a little more clear sometimes. This would like like this:
1
B
r
2
+
2
K
I
=
2
K
B
r
+
1
I
2
Can you see that there is now an equal amount of each element on each side of the equation? That means that it is balanced.
Answer: its a reduction and an oxidation reaction
Explanation:
Identify the type of reaction shown here.
2HgO → 2Hg + O2
Combustion
Decomposition
Synthesis
Single Replacement
Answer:
Decomposition
Explanation:
One reactant has formed two products
My car has an internal volume of 3,600 L. If the sun heats my car from a temperature of 18.0 degrees Celsius to a temperature of 45.0 degrees Celsius, what will the pressure inside my car be? Assume the pressure a was initially 101.3 kPa.
Answer:
110.7 kpa or 1.097 atm your choice of pressure units
Explanation:
We can assume the Volume is constant since we are not told other wise and it is indeed a car. We can Use P1/T1= P2/T2
So (T2xP1 )/ T1 = P2
(318Kx101.3kpa)/291k = 110.7 kpa or 1.097 atm your choice of pressure units
if your wondering why i used Kelvin gas laws are always in units of Kelvin
Explain why the noble gases are unusually stable.
Answer:
Noble gases are the least reactive of all elements. That's because they have eight valence electrons, which fill their outer energy level. This is the most stable arrangement of electrons, so noble gases rarely react with other elements and form compounds.
Explanation:
A student has the following data recorded: final readings: 760. mm Hg, 6.0L, 197 'C. initial readings:
712 mm Hg, -76.9 °C. She calculates the initial volume to be -2.5 L. Is her answer correct? Explain why
or why not.
Welding is an industrial process that is used to join pieces of metal. A certain mixture of gases used in welding is composed of carbon dioxide and argon. The partial pressure of carbon dioxide is 0.080 atm and the partial pressure of argon is 0.24 atm
The given question is incomplete. The complete question is :
Welding is an industrial process that is used to join pieces of metal. A certain mixture of gases used in welding is composed of carbon dioxide and argon. The partial pressure of carbon dioxide is 0.080 atm and the partial pressure of argon is 0.24 atm. What is the total pressure of the mixture.
Answer: 0.32 atm
Explanation:
According to Dalton's law, the total pressure is the sum of individual pressures.
[tex]p_{total}=p_{CO_2}+p_{Ar}[/tex]
Given : [tex]p_{total}[/tex] =total pressure of gases = ?
[tex]p_{CO_2}[/tex] = partial pressure of carbon dioxide = 0.080 atm
[tex]p_{Ar}[/tex] = partial pressure of argon = 0.24 atm
putting in the values we get:
[tex]p_{total}=0.080atm+0.24atm[/tex]
[tex]p_{total}=0.32atm[/tex]
Thus the total pressure of the gases is 0.32 atm
Which receives the most solar radiation?
a. the oceans
b. the polar zones
C. the temperate zones
d. the tropics
Answer:
D
Explanation:
tropical areas receives the most solar radiation because the sun's rays are nearly perpendicular to the earths surface
ASAP pleaseee and Thankyou
Answer:
i think 50%
Explanation:
HELP NEEDED ASAP
What mass of Al is produced when 0.500 mole of Al2 S3 is completely reduced with excess H2? (At. Masses of Al=27, S=32, H=1)
Select one:
a. 13.5 g
b. 27.0 g
c. 2.7 g
d. 54.0 g
HOW MANY LITERS ARE IN 7110.5 mL? WHAT IS THE UNIT?
need help ASAP , anybody
- 20 points
Answer:
i think it is b im not sure
Explanation:
Air does not have a chemical symbol or formula. Why?
1)It contains different amounts of water depending on where you are.
2)Air is not a pure substance.
3)It depends on the temperature.
4)It depends on how far above sea level you are.
Answer:
2. Air is not a pure substance
Explanation:
Air does not have a chemical symbol or formula because air is not a pure substance (option 2).
What is air?Air is a mixture of different gases. A mixture is a substance that constitutes other compounds that are not chemically bonded together.
This means that air as a mixture is made up of different gaseous components that possess their own individual identity.
Atmospheric air is composed of the following different constituents;
78% nitrogen21% oxygenSmall amounts other gases including carbon dioxide, neon, and hydrogen etc.This shows that air is not a pure substance and accounts for the reason why air does not have a definite chemical formula or symbol.
Therefore, option 2 is correct.
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What is the best method of eye protection in laboratory?
Answer:
goggles
Explanation:
...................
What effect does an increase in products have on the reaction rate of a mixture at equilibrium?
Rate of reaction will decrease if there is an increase in product concentration.
If one (or more) of the reactants or products concentrations are raised, the equilibrium will change to lower the concentration. Alternately, if the temperature is lowered, the equilibrium will change to favor the exothermic process, which will raise the temperature.
The rate of the reaction will frequently rise as one or more of the reactants are concentrated more. This happens as a result of the fact that a reactant collides more frequently over time at increasing concentrations.An increase in a products concentration will result in a decrease in the total quantity of products and an increase in the total number of reactants. That is the reaction will move backwards.Hence, there is decrease in rate of reaction as the product concentration increases.
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The diagrams below represent the four states of matter.
A number of blue balls are loosely packed in a container. A number of yellow balls are randomly distributed in a container.
Diagram 1 Diagram 2
A number of red balls are tightly and neatly packed in a container. A number of balls are positioned randomly in a container. Some are pink and labeled with a plus sign and some are blue and labeled with a minus sign.
Diagram 3 Diagram 4
Which diagram represents a gas that has been ionized?
diagram 1
diagram 2
diagram 3
Answer: Diagram 4
Explanation: Diagram 1 represents a state in which particles are closely packed , thus cannot be a representation of gas.
Diagram 2 represents a state in which particles are loosely packed , thus can be a representation of gas.
Diagram 3 represents a state in which particles are closely packed , thus can be a representation of a solid.
Diagram 4 represents a state in which particles are loosely packed , thus can be a representation of gas. It also represents the particles in ionized form. Particles are existing as ions bearing positive and negative charges.
Explanation:
Answer:
D
Explanation:
16 grams of propane, C 3 H 8 and 20 grams of oxygen, O 2 are reacted to produce carbon dioxide and water. Calculate the volume of CO 2 produced?
Answer:
The volume of CO₂ produced is 8.4 L
Explanation:
The mass of propane in the reaction C₃H₈ = 20 grams
The mass of, oxygen, O₂ in the reaction = 20 grams
The produce of the reaction are carbon dioxide, CO₂ and water, H₂O
The balanced equation of the (combustion) reaction can be presented as follows;
C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (g)
Therefore, one mole of propane, C₃H₈, reacts with five moles of oxygen, O₂, to produce three moles of carbon dioxide, CO₂, and four moles of water molecules, H₂O, as steam
The number of moles = Mass/(Molar mass)
The molar mass of propane, C₃H₈ = 44.1 g/mol
The number of moles of propane in 16 grams of propane = 16/44.1 ≈ 0.3628 moles
The molar mass of oxygen, O₂ = 32.0 g/mol
The number of moles of oxygen in 20 grams of propane = 20/32 ≈ 0.625 moles
Therefore;
Given that 1 mole of C₃H₈ reacts with 5 moles of O₂
1 mole of O₂ will react with 1/5 moles of C₃H₈
0.625 moles of O₂ will react with 0.625/5 = 0.125 moles of C₃H₈ to produce 3 × 0.125 = 0.375 moles of CO₂
1 mole of an ideal gas occupies 22.4 L at standard temperature and pressure
Taking CO₂ as an ideal gas, we have;
0.375 mole of CO₂ will occupy 0.375 × 22.4 L = 8.4 L
Therefore, the volume of CO₂ produced = The volume occupied by the 0.375 moles of CO₂ = 8.4 L.
Which phrase describes a polymer? A. a branching structure containing 10 carbon atoms and 22 hydrogen atoms B. a crystal containing many sodium ions and many fluoride ions C. a long chain of carbon atoms with hydrogen atoms attached to them D. a molecule containing six carbon atoms arranged in a ring structure E. a single atom of calcium bonded to two atoms of chlorine
Answer:
C. A long chain of carbon atoms with hydrogen atoms attached to them
Explanation:
For example, the main component of flour is starch and starch is a polymer.
Now, Starch is a polymeric carbohydrate that consists of a large number of glucose units which are bonded by chemical bonds known as glycosidic bond. It's also known that Starch is a white, tasteless and odorless powder that is not soluble in alcohol or even cold water.
Thus, we can say that polymer is a long chain of carbon atoms with hydrogen atoms attached to them.
Option C is correct.
Answer:
C. A long chain of carbon atoms with hydrogen atoms attached to them
Explanation:
For example, the main component of flour is starch and starch is a polymer.
Now, Starch is a polymeric carbohydrate that consists of a large number of glucose units which are bonded by chemical bonds known as glycosidic bond. It's also known that Starch is a white, tasteless and odorless powder that is not soluble in alcohol or even cold water.
Thus, we can say that polymer is a long chain of carbon atoms with hydrogen atoms attached to them.