Answers
Answer: ¹²₅C
Explanation:
¹²₅C is incorrect. The superscript is the atomic mass. This varies between each element. The subscript is the atomic number. This doesn't change. You will see every element has the correct atomic atomic number except for Carbon. Carbon should have atomic number 6.
Related Questions
If the half-life of iodine-131 is 8.0 days, how much of a 100.0 mg sample of it will remain after 32 days? In case you're interested, iodine-131 forms xenon-131 by beta emission/decay. Please enter only a numerical answer and do not write in any units. It is understood that the unit is mg.
Answers
Given :
Half-life of Iodine , [tex]t_{0.5}=8 \ days[/tex] .
Initial concentration , [tex][A_o]=100\ mg[/tex] .
To Find :
The amount of sample remains after 32 days .
Solution :
Rate constant is given by :
[tex]k=\dfrac{0.693}{t_{0.5}}\\\\k=\dfrac{0.693}{8}\ s^{-1}\\\\k=0.086625\ s^{-1}[/tex]
Now , by rate law :
[tex][A]=[A_o]e^{-kt}[/tex]
Putting all given values, we get :
[tex][A]=100\times e^{-(0.086625)\times 32}\\[/tex]
[tex][A]=6.25\ mg[/tex]
Therefore , the remaining sample after 32 days is 6.25 mg .
Hence , this is the required solution .
A liquid has a density of 0.70g/ml. Find the mass of the liquid which can be put
into a beaker holding 130mL.
Answers
Answer:
The answer is
91 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
density of liquid = 0.70 g/mL
volume = 130 mL
The mass is
mass = 0.7 × 130
We have the final answer as
91 gHope this helps you
1)petroleum and natural gas are formed in the__________
2)_______ refers to the things that exists freely in nature or human use
3) during the ____ period the earth was covered with swampy forest's
4)-------- is the mixture of hydrogen, methane, carbon monoxide, and other gases
5)natural gas mainly consists of_____
6)_____are the chemicals derived from petroleum and natural gas
7) the process of refining of petroleum is carried out in refineries and is called _____
8) _____ is used to generate power and to manufacture other fuels like coke and coal tar
Answers
2. Air, peace of mind know knowleged and water
3. The Carboniferous
4. Is a colorless , odorless gass that is very flammable.
how do i convert 0.5L to mL
Answers
Answer: 500
Explanation: there's 0.001L in every mL. Divide the mL
by 1000 or multiply the liter by 1000.
what is an oxidation reaction?
Answers
Fe + O2 —(H2O)—> Fe2O3
Which element has an atomic mass of 106.42?
Answers
Answer:
carbon
Explanation:
The element which has atomic mass of 106.42 is carbon as per the existing isotopes.
What is an element?
It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.
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A car accelerates from 0 to 72 km/hour in 6.0 seconds. What is the car's acceleration?
Answers
The acceleration of the car is equal to 3.33 m/s² with a velocity of 72 Km/hr.
What is acceleration?Acceleration can be demonstrated as the rate of change of velocity over time. The acceleration can be explained as vector quantity due to both magnitude and direction. Acceleration is defined as the 2nd derivative of the position of the object w.r.t. time.
According to Newton's 2nd law of motion, the force exerted is equal to the mass times of acceleration of an object.
a = F/m
or, a = dv/dt
Given, the final velocity of the car, v = 72 Km/hr
v = 72 × 1000/3600 m/s
v = 20 m/s
The time is taken by car to travel, t = 20 s
The acceleration of the car, a = (20 - 0)/(6 - 0)
a = 3.33 m/s²
Therefore, the acceleration of the car is 3.33 m/s².
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What is the definition of potential energy in physics?
Answers
Answer:
To summarize, potential energy is the energy that is stored in an object due to its position relative to some zero position. An object possesses gravitational potential energy if it is positioned at a height above (or below) the zero height.
Explanation:
I hope this helped
Wich tools are appropriate to determine the densety of an irregular-shaped object ?
Answers
Answer:
The most accurate way to determine an object's volume, especially in the case of an irregularly shaped object, is to immerse it in water and measure the amount of water it displaces. A graduated cylinder large enough to hold both the object and enough water to fully immerse it is the best tool for this job.
what is the name of that equipment she is using
Answers
Answer:
picture?
Explanation:
Mr.Davies has requested that you wait for 10 more minutes is that informal or formal
Answers
Answer:
Formal
Explanation:
Answer:
I think its formal because the question looks a bit fancy by using all the present perfect tense..
hope this helped you
please mark as the brainliest ( if its correct)(ㆁωㆁ)
What do you think of the word matter?
Answers
Answer:
matter is any substance that has mass and takes up space by having volume. ...
The gold-foil experiment was used to discover which subatomic particle? Question 2 options: electrons protons ==> neutrons (my answer)
Answers
Answer:Proton, the gold foil experiment indicated that the nucleus has a positive charge.
Which of the following example(s) from everyday life are made possible by modern chemistry?
If you could help me out I would really appreciate it. Thank you!
Answers
Answer:
I believe it is c
Explanation:
........................
From everyday life the following have been made possible by modern chemistry:
b. wearing a synthetic spandex athletic shirt
c. taking a pill to get relief from a cold
d. getting a boost of energy by eating an apple
Modern chemistry is a branch of chemistry that deals with the identification of structure, composition, physical as well as chemical properties of the substances that can help modern day humans to deal with their day to day problems like poor health, meeting energy requirements and others. Spandex is a material that has a chemical nature of absorbing the sweat from the body of athlete so this can be a part of modern chemistry. The chemical formulation of pill will help in fighting with the cold causing infecting agent in the body so it will help in overcoming the ill effects of cold thus helping mankind, so it is the part of modern chemistry. Apple is a source of sugar when it is metabolically broken in the body it releases energy which can be utilized by the body as a source of energy so it is a part of modern chemistry. Observing the sky at night during campaign is a physical phenomena.Hence, use of spandex in athletics shirt, pill for overcoming cold and apple as source of energy are parts of modern chemistry.
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What would be the charge of an ion with 9 protons, 10 neutrons, 10 electrons
Answers
Answer:
negative
Explanation:
Any atom whose number electrons are more than the number of protons in it will have a negative charge. Since in this case the electrons are 10 and protons are 9 the 9+ charge protons and 9- charge electrons cancel each other giving a final charge of negative.
The charge of an ion with 9 protons and 10 electrons and neutrons is -1 as there is one more electron in comparison to number of protons .
What is an ion?An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.
Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.They are attracted to opposite charges.
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The main group elements exclude which parts of the periodic table?*
1 point
Transition metals and lanthanide metals
Alkali metals and alkaline earth metals
Halogens and noble gases
Periods and families
How many blocks are found in the periodic table?
1 point
Answers
Answer:
Transition metals and lanthanide metals
Explanation:
Alkali metals, alkaline earth metals, halogens, and noble gases are all part of the main group elements.
Periods and families simply refer to the rows and columns of the periodic table. They don't specify the type of element.
A(n) __________________ is a statement of what you think will happen during an investigation. It is often written in the form of an if... Then... Because statement. Group of answer choices
Answers
Answer:
Hypothesis. Hope this helped! :)
If the block were to be cut in half, what would be the
density of the smaller block?
Answers
Answer:
Density stays the same
Explanation:
The density remains the same because cutting the object in half will divide the mass & volume by the same amount. Also, the density of a substance remains the same no matter what size it is.
Which statement best compares and contrasts lipids and carbohydrates?
Both are used for energy storage, but only carbohydrates are used for long-term energy storage,
Both are used for energy storage, but only carbohydrates are used for short-term energy storage.
Both are used for tissues, but only carbohydrates are used for tissue growth.
Both are used for tissues, but only lipids are used for tissue growth.
Answers
Answer:
The answer is B
Both are used for energy storage, but only carbohydrates are used for short-term energy storage.
Explanation:
hope it helps
got it right on edge
i just submitted it and got it right
Both are used for energy storage, but only carbohydrates are used for short-term energy storage.
MACROMOLECULES:
Macromolecules are large or complex molecules made up of monomers. The macromolecules in nature are as follows: proteins, carbohydrates, lipids and nucleic acids. Each macromolecule performs specific functions in the body and hence, are very important. Carbohydrates and lipids are used as energy storage, however, lipids store energy in the body for a long term than carbohydrates. Carbohydrates store energy for a short term because they are readily used by the body.Therefore, both macromolecules are used for energy storage, but only carbohydrates are used for short-term energy storage.
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In coulombs, how much positive charge is there IN a barium nucleus? On a barium ion?
Answers
Answer:
The amount of positive charge in a barium nucleus is approximately 8.972 × 10⁻¹⁸ coulomb
Explanation:
The amount of positive charge there is in a barium nucleus is found as follows;
The atomic number of an element is equal to the number of proton present in the atom
The atomic number of barium = 56 = The number of protons in an atom of barium
The positive charge of a single proton is known as an elementary charge, e, given by the formula, e = F/N[tex]_A[/tex]
Where;
F = Faraday's constant
N[tex]_A[/tex] = The Avogadro's number
Therefore, e = 1.602 176 634 × 10⁻¹⁹ C
Which gives the positive charge, Q, of the protons of a barium nucleus as follows;
Q = Number of protons × e
Q = 1.602176634 × 10⁻¹⁹ × 56 ≈ 8.972 × 10⁻¹⁸ Coulomb per atom of barium.
The amount of positive charge in a barium nucleus ≈ 8.972 × 10⁻¹⁸ coulomb.
Question 4
These are the uncharged particle located in the nucleus. The number of these tha
atom has is equal to its mass number minus its atomic number.
1. Protons
2.Nuclei
3.Neutrons
4.Electrons
Answers
3. Neutrons
I hope that helped. Good Luck!
Find the volume of the a with a length of 5cm, a width of 5cm, and height of 10cm.
Answers
Answer:
250 cm³
Explanation:
V = l × w × h
V = (5) × (5) × (10)
V = 250 cm³
Explain why the design of the bird's nest in the picture provides good insulation for the eggs.
Answers
Answer:
First, the lining may consist of loose, smaller bits of the same materials that have been incorporated into the latticework of the nest. These finer materials are utilized to shed water, deter pests, conceal the eggs from predators, insulate, and cushion them. ... They also serve to insulate and cushion the eggs.
Explanation:
Question 26 (1 point)
Use the periodic table to determine which statement below is true of the element Bromine (Br).
•Bromine will lose 7 valence electrons to become a negative ion.
•Bromine will lose 7 valence electrons to become a positive ion.
•Bromine will gain 1 valence electron to become a negative ion.
•Bromine will gain 1 valence electron to become a positive ion.
Answers
Answer:
The correct option is;
Bromine will gain 1 valence electron to become a negative ion
Explanation:
Bromine can be found in period 4 in group 17 of the periodic table and is an halogen
The electron configuration of bromine can be presented as follows;
Electronic configuration 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁵
Therefore, an atom of bromine has 2 + 5 or 7 electrons in its outermost shell, which makes it have one less electron to complete a full octet structure and therefore, bromine has a strong affinity for electron to complete its octet structure and it is thus a strong oxidizing agent.
When bromine enters into a chemical reaction and gains the one valence electron it becomes a negatively charged ion.
What is the difference between magma and lava?
Help PLZ!!!!!!
A Magma is molten rock within the earth; lava is molten rock on the earth's surface.
B Magma is cool, lava is very hot.
Magma is very hot, lava is cool,
Magma is molten rock on the earth's surface; lava is molten rock within the earth.
Answers
Answer:
the answer is A. Magma is molten rock within the earth; Lava is molten rock on the earth's surface
Answer:
A Magma is molten rock within the earth
Explanaton:
A different student is given a 10.0g sample labeled CaBr2 that may contain an inert (nonreacting) impurity. Identify a quantity from the results of laboratory analysis that the student could use to determine whether the sample was pure.
Answers
Answer:
Explanation:
It is density.
I do hope I helped you! :)
how are protons and neutrons found?
Answers
Answer:
Electrons are found in shells or orbitals that surround the nucleus of an atom. Protons and neutrons are found in the nucleus. They group together in the center of the atom.
Explanation:
I'm not sure if this is correct but I hope this helps.
How could contaminants from your community affect a river basin that is miles away?
Answers
contaminants from your community can flow through runoff into a river basin.
Contaminants from your community affect a river basin that is miles away could runoff can carry pollutants from your neighborhood into a river basin.
What is community?Community is defined as a social community that shares characteristics like geography, rules, beliefs, values, or identities. Community is important because they are frequently a significant source of social connection and a sense of belonging, strong communities are essential. Living a fulfilling life requires being a part of a group of people who share similar attitudes, values, and aspirations.
Contaminants are defined as a substance that, whether unintentionally or on purpose introduced to air, water, soil, or food, becomes detrimental to humans or other living things on a biological, chemical, physical, or radiological level. Chemical, physical, and biological pollution are the three different types.
Thus, contaminants from your community affect a river basin that is miles away could runoff can carry pollutants from your neighborhood into a river basin.
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A student lifts a bag from the floor to his or her shoulder 1.2m above the floor, using a force of 50N. How much work does the student do on the bag ?
Answers
1.2m x 50N = 60J
60 J work does the student do on the bag.
The formula for work is as follows:-
[tex]W=F\times d[/tex]....(1)
Here, F is the force, and d is the distance moved in the direction of force.
Substitute 50 N for force and 1.2 m for distance in the equation (1) as follows:-
[tex]W=50\ N\times 1.2\ m\\\\=60\ Nm\\\\=60\ Joule[/tex]
Hence, the value of work is 60 J.
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Look at the unbalanced reaction below for the combustion of hydrogen gas. What needs to be done to balance the reaction? _ H2 + _O2 LaTeX: \longrightarrow⟶ _H2O
Answers
Answer:
The given equation H2 + O2 => H2O is not balanced as the oxygen atom on the right side do not have the same number of atoms as of the left side.
In a balanced equation, the number of atoms on both sides are equal. So in this case, we are required to change the coefficient in front of H2O, in order to make oxygen atom balance, for that we need to change the coefficient of H2 as well.
It means to make the given equation balance we need to change the coefficient in front of H2 and H2O.
Balance equation: 2H2 + O2 => 2H2O