The chart above shows the relationship between the first ionization energy and the increase in atomic number. The letter on the chart for the alkali family of elements is
A. W
B. X
C. Z
D. Y
Answers
Related Questions
Metal objects, such as knifes or bullets, that come into contact with bones can leave trace evidence on them.
O True
O False
Answers
A 57.6 g sample of methane (CH4) is found to contain 43.2 g of carbon. What is the
percent composition of Carbon and Hydrogen? How much hydrogen (in grams) would a
37.8 g sample of methane contain?
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Answer:
Explanation:
The atomic mass of carbon is 12.011 g/mol.The atomic mass of hydrogen is 1.00794 g/mol.This means that the atomic mass of methane is 12.011+4(1.00794)=16.04276 g/mol.
The percent composition by mass of carbon is [tex]\frac{12.011}{16.04276} \times 100=\boxed{74.9\%}[/tex]The percent composition by mass of hydrogen is [tex]\frac{4(1.00794)}{16.04276} \times 100=\boxed{25.1\%}[/tex]This means that in a 37.8-gram sample of methane, there would be [tex](37.8)\left(\frac{25.1}{100} \right)=\boxed{9.49}[/tex] grams of hydrogen.
When iron rusts the iron atoms (Fe) form iron(III) ions (Fe³⁺)
Fe(s) -------> Fe³⁺(aq) + 3e˗
Water and oxygen are required for iron to rust.
Write the equation for water and oxygen reacting to form hydroxide ions (OH-(aq)) ions.
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Answer:
H20+O2>2FeOH this is the right answer
AZX symbol of a cation with 13 neutrons
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The AZX symbol of a cation with 13 neutrons is A = 24 , Z = 11 and X = Na+
What is AZX?AZX is a symbol which stands for;
A is the mass numberZ is the atomic number or the number of protonsX is the chemical symbol of the elementNote, cations are positively-charged ions having more protons than electrons due to loss of one or more electrons.
Sodium ion represented as Na+ is a cation which lost one electron. It has 13 neutrons and 11 protons.
But the mass number of an element, A is the sum of protons and neutrons of the element.
Thus, for Na+
A = 13 + 11 = 24
Z = 11
X = Na+
Therefore, the AZX symbol of a cation with 13 neutrons is A = 24 , Z = 11 and X = Na+
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Draw a diagram using H+ signs and OH- symbols of a solution that is acidic. Hint: Use the
diagram seen in the prelab.
WILL MARK BRAINLIEST!!!!
Answers
More positive ions shows acidic whereas more negative ions indicates basic solution.
Which charge show acidic solution?That side which has more positive charges is considered as acidic solution while on the other hand, that region where negative charges are present in large number as compared to positive charges is considered as basic or alkaline solution.
So we can conclude that more positive ions shows acidic whereas more negative ions indicates basic solution.
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Which lists only abiotic factors in this environment?
grass, tree, rock, soil
bird, turtle, grass, tree
sun, water, grass, soil
water, rock, soil, sun
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In this case, among the list of components given, the abiotic factors are water, rock, soil, and sun.
What is an abiotic factor?An abiotic factor is a non-living part of an ecosystem that shapes its environment.
Biotic and abiotic factors make up a community via interaction.
Biotic factors are considered living things (having "life") while abiotic factors are simply non-living things.
Hence, in this case, among the list of components given, the abiotic factors are water, rock, soil, sun
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When energy decreases what happens to particle motion?
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Answer:
When a substance is cooled, its internal energy decreases: the movement of its particles decreases. bonds between particles form when a substance condenses or freezes, or sublimes to form a solid from a gas. What is called energy? Energy is the capacity of a physical system to do work.
Explanation:
How is the modern periodic table different from Dmitri Mendeleev's table?
A. Elements that have similar properties are now grouped together.
O B. Elements are now organized by increasing atomic mass.
OC. The lanthanides and actinides are now in rows below the main
table.
D. The table is now used to predict the properties of elements.
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Elements are now organized by increasing atomic mass. Hence, option B is correct.
What is a periodic table?The periodic table is a tabular array of chemical elements organized by atomic number.
Mendeleev's periodic table orders the elements based on their atomic mass whereas the Modern periodic table orders the elements based on their atomic number.
Hence, option B is correct.
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This download is my science worksheet. It's about different types of energy in a situation, like examples. btw this is 7th grade science
Answers
All types of energy can be resumed into two basic types of energy which include kinetic energy and potential energy.
What is kinetic energy?Energy is the ability to perform a given work. Kinetic energy is energy in movement, whereas potential energy is stored energy.
For example, plant photosynthesis makes reference to chemical energy (potential energy), popcorn makes reference to thermal energy, etc.
In conclusion, all types of energy can be resumed into two basic types of energy which include kinetic energy and potential energy.
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2.
An ion has 15 protons, 16 neutrons, and 18 electrons.
a.
b.
What is the atomic number?
What is the mass number?
What is the overall charge?
d. Write the isotope notation.
C.
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For B to find the atomic mass you would just have to add the protons and neutrons so 15+16=31 and as we can see Phosphorus does have a mass of 31 so for B it would be 31
For C it would be 5
And for D it would be the atomic mass of Phosphorus which is 31 over the atomic number which is 15 so it would be P31/15
no.of atoms in 12g of He
Answers
Answer:
hope this will help you......
covers 70 precent of earths surface
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Answer:
Water covers 70 percent of earth's surface.Which description best describes volume? *
O How hard the particles are pushing on something
O How many particles of something there is
O How hot/cold something is
How much space something takes up
O8.3145 L kPa / K mol
Answers
Answer:
how many particles are pushing something
what is the different nobel gases that didnt have octet rule
Answers
The noble gas, Helium has only two electrons with the electronic configuration as 1s2. Hence, it does not have a complete octet. and thus, it doesn't follow the octet rule.
An octet is a set of eight. Atoms of each of the noble gases (except helium) have eight electrons in their highest occupied energy levels and the general electron configuration of ns2np6.
Select the correct answer. the compound diborane can be used as a rocket propellant. what is the percent composition of boron in diborane (b2h6)? a. 22% b. 25% c. 39% d. 75% e. 78%
Answers
The percent composition of boron in diborane (b2h6) is 78% because the mass of boron is higher than hydrogen atom.
What is diborane?Diborane is a poisonous, reactive gas that is produced by the action of acids on borides. Diborane is used as a reducing agent for making other chemicals and also act as a catalyst.
So we can conclude that The percent composition of boron in diborane (b2h6) is 78% because the mass of boron is higher than hydrogen atom.
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The compound diborane can be used as a rocket propellant. the percentage composition of boron in diborane (B2H6) is 75%. Option D. This is further explained below.
What is the compound diborane?Generally, Diborane is simply defined as a compound having the molecular formula B2H6, Diborane is more often known as diborane.
In conclusion, As a rocket fuel, diborane is a useful chemical. Diborane (B2H6) contains 75 percent boron by weight.
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Type the correct answer in each box.
Balance the chemical equation.
N₂O3-
N₂ +
0₂
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The Balanced Reaction is 2N₂O₃⁻ -----> 2 N₂ + 3 0₂
What is a Balanced Reaction ?A reaction in which the number of atoms of each element in the reactant and the product are equal is called a Balanced Reaction .
It is given in the question:
To Balance the chemical equation.
N₂O₃⁻ -----> N₂ + 0₂
To balance the reaction , the number of molecules of each element , i.e. Nitrogen (N) and Oxygen (O) needs to be balanced
2N₂O₃⁻ -----> 2 N₂ + 3 0₂
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In the photo
Pls pls pls pls pls pls pls pls pls pls
Answers
When an object has potential energy, it means that the object has pent up energy that isn’t being used yet. It is about to do something, but it is at the climax and hasn’t done it yet. For example, if you’re winding up your arm, ready to throw a ball, the energy in the ball isn’t released yet. But, if you were to throw it, it now has kinetic energy.
Kinetic energy happens when an object is in motion. While it is moving, it releases kinetic energy, like my ball example.
Hope this helps! :)
The correct answers are Potential and Kinetic energy.
What are potential energy and examples?An object can store energy as a result of its position. For example, the heavy ball of a demolition machine is storing energy when it is held at an elevated position. This stored energy of position is referred to as potential energy. Similarly, a drawn bow is able to store energy as a result of its position.
What is kinetic energy?Kinetic energy is a form of energy that an object or a particle has by reason of its motion. If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy.
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Match the following items.
1. not affected by a magnet
2. mostly space
3. flows freely but particles still attract
4. positively charged particles
5. free to move in all space
6. negatively charged particles
7. atoms nearly fixed in space
8. helium nucleus
proton
solid
liquid
gamma ray
gas
atoms
electron (beta)
alpha particles
Answers
Answer:
1. not affected by a magnet 1 liquid
2. mostly space 2 solid
3. flows freely but particles still attract 3 proton
4. positively charged particles 4 gas
5. free to move in all space 5 alpha particles
6. negatively charged particles 6 atoms
7. atoms nearly fixed in space 7 gamma ray 8. helium nucleus 8 electron (beta)
Which energy source has been developed and improved by chemists?
A. coal
B. wind
C. battery
please don't say nuclear as it is quite literally not a choice.
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Why is the spectrum from our sun a combination of spectral types?.
Answers
The Caribbean islands are known for their many resources. For example, the ore of aluminium is found in Jamaica and Guyana. (i) Briefly describe the extraction of aluminium from its named ore. Include in your description ONE ionic equation.
Answers
Answer:
i don't know send on my insta I'd its_arsh_pb27
Explanation:
Which equation represents an addition reaction?
(1) c3h6 + cl2 c3h6cl2
(2) caco3 cao + co2
(3) cacl2 + na2co3 caco3 + 2nacl
(4) c3h8 + cl2 c3h7cl + hcl
Answers
c3h6 + cl2---- c3h6cl2 is a type of equation represents an addition reaction because new products are formed.
What is addition reaction?Addition reaction is a type of reaction in which one molecule combines with another to form a bigger molecule having no other products. We can see that the above reaction has no byproduct.
So we can conclude that c3h6 + cl2---- c3h6cl2 is a type of equation represents an addition reaction because new products are formed.
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When balancing chemical equations the left hand side of the equation is known as the ______, while the right hand side is known as the ______.
Answers
Answer:1# reactants 2#coefficient
Explanation:
How many grams are in 4.5 moles of NaF?
Answers
Answer:
3139542g
Explanation:
That's because if you talk about
4.5
moles of sodium fluoride, you would get a really absurd number of grams.
The process of seeping of water into the ground in called
Answers
Answer: Infiltration
Explanation: it is the process by which surface water, rainwater or snowmelt seeps into the ground
Describe the properties of alkali metals. based on their electronic arrangement, explain whether they exist alone in nature.
Answers
The alkali metals can't exist alone in nature because of incomplete outermost shell of alkali metals.
What are the properties of alkali metals?The alkali metals have the high thermal and electrical conductivity. It has high lustre, ductility, and malleability as compared to other materials. Each alkali metal atom has one electron in its outermost shell which make more reactive.
So we can conclude that the alkali metals can't exist alone in nature because of incomplete outermost shell of alkali metals.
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Which of the following materials fall in the category of a ‘‘pure substance’’?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, brick, wood, Air
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Answer:
1) Ice, iron, calcium oxide and mercury are pure substances since they contain particles of only one kind of matter.
2) In contrast, milk, hydrochloric acid (hydrogen chloride gas dissolved in water), brick and air cannot be called pure substances because they consists of particles of more than one kind of matter.
Perform the following operation and express the answer in scientific notation 8.6500x10^3+6.5500x10^5
Answers
Taking into account the scientific notation, the result of the sum is 6.6365×10⁵.
Scientific notationFirst, remember that scientific notation is a quick way to represent a number using powers of base ten.
The numbers are written as a product:
a×10ⁿ
where:
a is a real number greater than or equal to 1 and less than 10, to which a decimal point is added after the first digit if it is a non-integer number.n is an integer, which is called an exponent or an order of magnitude. Represents the number of times the comma is shifted. It is always an integer, positive if it is shifted to the left, negative if it is shifted to the right.Sum in scientific notationYou want to add two numbers in scientific notation. It should be noted that when the numbers to be added do not have the same base 10 exponent, the base 10 power with the highest exponent must be found.
In this case, the highest exponent is 5.
Then all the values are expressed as a function of the base 10 exponent with the highest exponent. In this case: 8.6500×10³= 0.086500×10⁵
Taking the quantities to the same exponent, all you have to do is add what was previously called the number "a". In this case:
0.086500×10⁵ + 6.5500×10⁵= (0.086500+ 6.5500)×10⁵= 6.6365×10⁵
Finally, the result of the sum is 6.6365×10⁵.
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Moving electrons are found to exhibit properties of.
Answers
Answer:
both particles and waves
Explanation:
this is known as wave-particle duality.
I hope this helps.
Have a nice day.
Express this number in scientific notation.
31,000,000,000
Answers
Answer:
3.1 x 10^10
Explanation:
there are 9 zeroes, so the quick way is too just add a one to the 9 and you get 10, so that is your power.