The statement about pure substances and elements correct is all elements are pure substances ,therefore option (b) is correct .
What do you mean by the elements ?An element is a pure substance whose atoms all have the same number of protons.
Elements are the simplest chemical elements and thus can not be broken down through chemical reactions.
Characteristics of element -:
Elements cannot be broken down into simpler substances by the chemical reactions. Each element is represented by a unique symbol.The atomic number gives a distinct identity to a chemical element.The statement about pure substances and elements correct is all elements are pure substances ,therefore option (b) is correct .
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what is the mass of 0.2 moles of ethanol
Answer:
Answer is 9.2 grams
Explanation:
Molar mass of ethanol
[tex]{ \bf{CH _{3}CH_{2}OH}} = (12 \times 2) + (6 \times 1) + (16) \\ = 46 \: g[/tex]
for moles:
[tex]{ \sf{1 \: mole \: of \: ethanol \: weighs \: 46 \: g}} \\ { \sf{0.2 \: moles \: weigh \: (0.2 \times 46) \: g}} \\ = 9.2 \: g[/tex]
Behind your house, there's a gorgeous pond filled with frogs. You notice that the frogs behind Mr. Archer's house often have three legs. You start wondering if the fertilizer that Mr. Archer uses for his lawn is causing the deformities in the frogs. You collect 10 frogs and put the special fertilizer in their container (Group A). You put another 10 frogs and place them in a different container with just water (Group B). A week later, 7 out of 10 of the frogs in group A grew only three legs. The frogs in group B grew four legs.
What was the control group?
Answer:
Group B is the control group
Explanation:
In an experiment, a control group is the standard to which comparisons are made in an experiment.
In the following image, atoms are represented by colored circles. Different colors represent different types of atoms. If atoms are touching,
they are bonded.
Which of the following boxes shows only one type of element?
A. B
B. A
C. C
D. E
Answer: C
Explanation: Only one color (element) appears in C. The other options have at least 2 colors.
what are the examples of catalystic reactions
How is bacteria are different from animals?
Answer:
Bacteria has 1 cell and An Animal has multiple cells.
Explanation:
Bacteria is a cell its self. While An Animal, It has multiple cells that create multiple tissues, and those tissues create multiple organs, those organs make up an organ system. After the Organ System, it's an organism.
Organism = Animal, Human, Ect.
Meanwhile, Bacteria is made up ONE CELL (bacteria it's self is 1 cell)
So the answer is "Bacteria has 1 cell and An Animal has multiple cells."
I hope this helped!! <33
What is an element?
A. A substance made up of all the same type of atoms
B. A substance made up of different kinds of atoms
Answer:
A
Explanation:
element is a pure substance consisting only of atoms
Which list includes terms that only describe carbon dioxide, (CO2)?
a
molecule, compound, mixture
b
molecule, compound, pure substance
c
atom, element, mixture
d
atom, element, pure substance
Answer:
b. molecule, compound, pure substance
Terms that only describe carbon dioxide are molecule, compound, pure substance.
What is mixture and compound?In chemistry mixture is a combination of two or more different chemical elements which are not chemically bond. A mixture is the physical composition of two or more elements in which their individual identities are vanished and it also mixed by solutions, suspension and colloids.A compound can't be separate by physical separation and after the mixture you can't identified that it is compound or not.
In chemistry compound is combination of two or more different elements which are chemically bond. So compound is made up of chemical bond. A compound can't be separate by physical separation and after the mixture you can't identified that it is compound or not.A mixture is the physical combination of two or more elements in which their individual identities are retained and it also mixed by solutions, suspension and colloids.
Therefore, terms that only describe carbon dioxide are molecule, compound, pure substance.
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Difference between pulley and wheel and axle..
Explanation:
Difference between pulley and wheel and axle are:
pully = A pulley is a circular disc that has a groove around the circumference over which a rope or string can move. In the pulley, load is connected to one end of the rope and effort is applied on the other ends . The pulley that does not move up and down is called the fixed pulley.
Wheel and axle= Wheel and axle consists of two cylinders of different radii. The cylinder of large radius is called wheel and the cylinder radius is called axle . Both wheel and axle move together under the application of effort.
I have send you a photo of wheel and axle, pulley.
I hope it will help you so.
Mi One should know the properties of the components of the mixture to separate it. Explain with an example.
If an object is travelling 25.0 meters/second, how long will it take to travel 1.5 km?
Answer:
60 sec
Explanation:
in 1.5km there is 60 unit of 25 meter so
Protons, Neutrons, and Electrons worksheet! please help!!!
Answer:
Look up a picture of a periodic table, it will tell you all of it
Explanation:
Which two elements have the same number of energy levels with electrons in them?(1 point)
A_ krypton and neon
B_ boron and oxygen
C_ lithium and francium
D_ neon and sodium
Its B) Boron and Oxygen
The correct answer is B.
boron and oxygen have the same number of energy levels with electrons in them.
The energy level of an element is the region around the nucleus where its electron is likely to be, this corresponds to the period of the element in the periodic table.
Elements found in period 1, have one energy level.
Elements found in period 2, have two energy level.
Examples of elements found in period 2 include:
lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neonIn the given options, only option B contains two elements with 2 energy level.
Thus, boron and oxygen have the same number of energy levels with electrons in them.
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What is the name of this ??
Answer:
Explanation:
Your answer is C
When scientists talk about mass and volume, they are talking about which
of these?
A. energy
B. heat
C. matter
D. a vacuum
Answer:
C. Matter
Explanation:
Answer:
C. Matter
Explanation:
Matter is anything that occupies space(volume) and has mass.
GIVING 20 POINTS!! Apply Concepts Two chemists each plan an investigation in which they will combine hydrogen gas with chlorine gas to observe the chemical reactivity. The plans differ in that one will use 25 milligrams each of hydrogen and chlorine, and the other will use 1000 times this amount, i.e., 25 grams each of hydrogen and chlorine. Can the investigations reach similar conclusions about the reactivity of hydrogen with chlorine? Explain.
Answer:
Yes, the investigations will reach similar conclusions about the reactivity of H2 and Cl2
Explanation:
1. The law of multiple proportions says that when elements form compounds, the proportions of the elements in those chemical compounds can be expressed in small whole number ratios. This means that regardless of whether 1000 times more of the products are used, the reactivity of the products is established by the chemical reaction
2. The law of multiple proportions is an extension of the law of definite composition, which states that compounds will consist of defined ratios of elements.
3. A reaction with more reactants will need more care because more products are produced, which can be toxic
4. H2 and Cl2 reactivity does not depend on the quantities but the chemical properties of each compound
If aluminium has an atomic number of 13and has 14 neutrons what is its mass number
Answer:
27
Explanation:
mass number A = atomic number z + number of neutrons = 13+14= 27
Answer:
Explanation:
27
[tex]\huge\mathfrak\red{❥︎QuEsTioN}[/tex]
What is the Molecular mass of Feso4(NH4)2so4.6h2o
[tex]\\ \sf\longmapsto FeSO_4(NH_4)_2SO_4.6H_2O[/tex]
[tex]\\ \sf\longmapsto 56u+32u+4(16u)+2(14u+4\times 1u)+32u+4(16u)+2(1u)+2(16u)[/tex]
[tex]\\ \sf\longmapsto 120u+64u+56u+64u+2u+32u[/tex]
[tex]\\ \sf\longmapsto 120u+120u+98u[/tex]
[tex]\\ \sf\longmapsto 240u+98u[/tex]
[tex]\\ \sf\longmapsto 342u[/tex]
Answer:
[tex]\huge\mathfrak\green{hola}[/tex]
Someone plz help me :(
Answer:
B and A.
Explanation:
Many of the great scientists were religious. But the answer is not D.
A scientist may have strong opinions. That was certainly true of Newton. Most of the time he was right. Still the answer is not C. Science requires an open mind.
The answer is between A and B. Many discoveries were made looking at the natural world. That may provide the inspiration. But I don't think it is the answer. I'm going to say A
B is the other answer. Between A and B many scientific truths have been discovered.
How does an atom change if all of its electrons are removed?
How does an atom change if all of its electrons are removed?
The atom’s volume increases.
The atom’s mass increases.
The atom becomes positively charged.
The atom becomes negatively charged.
Answer:
c
Explanation:
it becomes positively charged
Answer:
The atom becomes positively charged.
Explanation:
If ALL OF THE ELECTRONS are removed, then there are, no matter what, less electrons than protons in an atom. And, since the atom has less electrons than protons, it becomes positively charged.
Plzzzzzz help me Write electronic configuratof sodium and chlorine in the term of subshell ?
Answer:
ans:Ne=2,8,1
ans:2,8,7
How does the density of one marble compare with the density of six of the
marbles?
Answer:
Since, density is mass per unit volume, the density is the same.
The density of the marbles will depend upon their mass and volume, not on their count.
What is the density?The density of an object is measured as the mass per unit volume. The average density equals the total mass of the object divided by its total volume.
The formula of the density of the material is expressed as follows:
Density = Mass/Volume
The S.I. unit of the density is Kg/m³. The density of a material is an intrinsic property as it doesn't depend on the size. If the size of the object increases, the mass increases as well but the density of material remains constant.
If the density of each marble is the same then the density of six marbles will be the same as the one marble because the density of marble is an intrinsic property. The density of marbles does not depend upon the number of marbles.
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A setup that involves material, a procedure, observations, and data can be found in a a(n)
Answer:
experiment
Explanation:
that is the answer
what is the formula of Plaster Of Paris(POP)?
Give the equation.
lakshu are you on?
Answer:
Molecular Formula :
(CaSO4)2.H2O or Ca2H2O9S2
Explanation:
Component Compounds CID 962 (Water) CID 1118 (Sulfuric acid) CID 5460341 (Calcium)
20 elements with there molecular formula
Answer:
First 20 Elements
Atomic Number Element Symbol
17 Chlorine Cl
18 Argon Ar
19 Potassium K
20 Calcium Ca
Water from this pot is changing from a liquid to a steam. Which process is taking place?
A. condensation
B. Boiling
Answer:
Boiling B.
Explanation:
What are the characteristics of a scientist?
Answer:
some of the main characteristics of a scientist are:
1. careful observation
2. curiosity
3. creativity
4. skepticism
5. objectivity
Explanation:
hope that helps>3
3
Explanation:
hopes it help you good luck
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What were the changes to the atomic model over time?
Answer:
The atomic model started out as a large single ball, then with electrons attached to it. It then became "planetary model" with electrons orbiting at specific levels, and then later one with a nucleus or multiple different particles like protons and neutrons, and electrons orbiting at general (but not specifically predictable) areas.
Explanation:
thank u :)
. Arrange the following in order of increasing radius:
a) Mg2+, Na+, Al3+
b) Na+, Al3+ , Mg2+
c) Mg2+ , Al3+ , Na+
d) Al3+ , Mg2+, Na+
Answer:
d
Explanation:
because nuclear charge ( no. of protons) increases
How many nickels are there in $5.25?
Answer:
105
Explanation:
1 nickel = 5 cents
5.25 dollars x 100 cents
= 525 cents
525 cents / 5 cents
= 105 nickels
white vitriol molecular formula
and green vitriol molecular formula??
Answer:
Green vitriol- FeSO4·7H2O
white vitriol- ZnSO₄