Answer:
- Atoms cannot be divided
- Atoms were named in the fifth century BCE
- Atoms are the smallest unit of matter
Explanation:
- The atom is widely known as the smallest unit matter is made of, which obtains properties of a chemical element.
- Atom can be regarded as indivisible amount of a chemical element having its own existance.
- All states of matter are made of neutral or ionized atoms.
- In the 5th century BCE, the basic concept of atom was by the atomist school in Ancient Greece.
An atom of a chlorine has an atomic number of 17and a mass number of 37 how many protons neutrons and electrons are in a atom???? Need help!!!!
Answer:
number of protons =17
number of neutrons=20
number of electrons=17
Atomic number is the same as proton number
To find the neutrons
subtract the atomic number from the mass number
thus, Neutrons =Mass number - Atomic number
Neutrons=37-17
Neutrons=20
An atom of a chlorine has an atomic number of 17and a mass number of 37 . The number of protons =17 ; number of neutrons=20; number of electrons=17
The Atomic number of an element is the same as proton number
And, To find the number of neutrons we need to subtract the atomic number from the mass number
given,
atomic number =17
mass number= 37
thus, Number of Neutrons =Mass number - Atomic number
Number of Neutrons=37-17
number of Neutrons=20
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According to the Law of Conservation of Mass, the number of iron atoms needed to complete the following reaction is ___ Fe + 3O2 → 2Fe2O3
Answer:
is 4
Explanation:
Fe + 3O₂ → 2Fe₂O₃
The law of conservation of mass states that "matter is neither created or destroyed in a system". Now, by careful inspection of the atoms reacting and the product formed, we see that the equation is not balanced.
Fe on reactant side is 1 but 4 on the product side. To balance it up, we simply put 4 as the coefficient behind the iron atoms.
4Fe + 3O₂ → 2Fe₂O₃
Answer:
4
Explanation:
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How does the vegetation surface type affect the amount of runoff
Answer:
The type of vegetation a surface does affect the water coming from above to sink in or runoff.
Explanation:
This is how the vegetation affects the runoff:-
The leaves and stems present in the vegetation do not let the water fall directly on the soil and makes the process rather slow which makes the water to get to the ground slowly and sink in properly inside the soil rather than running off.
If the vegetation present is dense with there was being hairy then also the water would not run out and will get absorbed by the roots letting the soil intact
Which of the following forces can make a ball move?
A- A balanced force
B- An unbalanced force
C- Equal and opposite forces along a horizontal plane
D- Equal and opposite forces along a vertical plane
Answer:
The answer for this question would be B- An unbalanced force
Answer:
the answer is b
Explanation: I'm guessing
All gases listed are at the same pressure. Which gas will most closely approach ideal behaviour?
A ammonia at 100K
B ammonia at 500K
C neon at 100K
D neon at 500K
tell me the answer and explain well
Neon at 500K (Option D) will most closely approach ideal behavior because at this high temperature, its weak dispersion forces are easily overcome, allowing it to behave more like an ideal gas.
Explanation:The key to determining which gas most closely approaches ideal behavior is to consider both the intermolecular forces and the conditions of temperature and pressure. Real gases deviate from ideal behavior under conditions of high pressure and low temperature because these conditions allow the volume and intermolecular forces of the gas particles to no longer be negligible. Therefore, a gas will behave more ideally at higher temperatures and lower pressures, where the kinetic energy of the gas particles is high enough to overcome intermolecular attractions.
In this case, even though all gases are at the same pressure, the temperature is different. Ammonia is a polar molecule with stronger intermolecular forces, specifically hydrogen bonding. In contrast, neon is a noble gas with very weak dispersion forces due to its non-polarity and small atomic size. Given the choices, neon at 500K (Option D) will most closely exhibit ideal behavior because the high temperature would provide sufficient kinetic energy to overcome the already weak dispersion forces between its atoms.
Oxygen and nitrogen are both gases at room temperature. Explain why oxygen has a greater force of attraction between its particles than nitrogen. (Room temperature is 20°C) please help
Answer:
Explanation:
Oxygen molecules and Nitrogen molecules forms in a very similar way. The attraction between particles of oxygen is great due to its very high electronegativity value. Oxygen has a higher electronegative value compared to nitrogen.
Electronegativity of an atom is the relative tendency with which atoms of an element attracts valence electrons in a chemical bond. Valence electrons are used in forming chemical bonds. They can be transferred from one atom to the other or they can be shared.
Oxygen is the second most electronegative atom on the periodic table. To form a bond, it shares the valence electrons in order for its octet to be complete. Pull for the valence electrons between the contributing atoms is very strong due to their large electronegative values. This pull is stronger compared to that between nitrogen atoms.
Final answer:
Oxygen molecules have greater intermolecular forces than nitrogen due to magnetic interactions from unpaired electrons (paramagnetism) and oxygen's higher electronegativity.
Explanation:
The force of attraction between oxygen (O₂) molecules is greater than that between nitrogen (N₂) molecules due to the nature of intermolecular forces at play. Oxygen molecules have two unpaired electrons in their outer orbitals, which facilitates the formation of weak magnetic interactions between them known as paramagnetism. These paramagnetic forces add to the usual London dispersion forces contributing to a stronger overall attractive force compared to nitrogen, which does not exhibit this magnetic property due to its paired electrons. Furthermore, oxygen's slightly higher electronegativity may also enhance these attractive forces compared to nitrogen.
What portion of the cell provides the energy for mitosis and other functions?
Answer:
The cell that helps provide the energy for mitosis is Process of cell division that results in to identical daughter cells.
Do changes that cannot be easily reversed, such as burning,
observe the law of conservation of mass?
Explain.
Answer:
Yes. Burning usually observes this kind of law.
Explanation:
The law of conversion of mass states that mass can never be formed nor can it be eradicated. This means that in case of burning, the amount of matter before and after will remain to be the same. It doesn't change at all.In conclusion, there's no form of change that can be able to affect matter.Which sample of matter is classified as a solution
Answer: Air, sea water, and carbonation dissolved in soda are all examples of homogeneous mixtures, or solutions. Hope this helps :)
Wdyt a pure substance is
Answer:The pure substance within chemistry is a very simple concept to grasp. Pure substances are defined as substances that are made of only one type of atom or only one type of molecule (a group of atoms bonded together). ... Purity can also have an important impact on the chemical properties of a substance.
Explanation:
A pure substance is a material with a fixed chemical composition, and it can be either an element or a chemical compound. It exhibits specific melting and boiling points, and chromatography reveals its pure status. While absolute purity is rare, highly pure substances are used in specialized industries.
A pure substance is a material that consists entirely of one type of matter with a fixed chemical composition. It can be classified as an element or a chemical compound. For example, oxygen is composed only of oxygen atoms, making it a pure substance. Similarly, water (H2O) is a pure substance because it is always composed of two hydrogen atoms bonded to one oxygen atom in a fixed ratio.
To determine the purity of a substance, scientists use techniques like melting and boiling point analysis, and chromatography. Pure substances have distinct melting and boiling points, unlike mixtures which melt or boil over a range of temperatures. Chromatography, on the other hand, separates a substance into its components; if only one component is present, the substance is pure.
Attaining absolute purity is challenging, but in specialized applications such as semiconductor manufacturing, materials approach near-absolute purity, like hyperpure water. The concept of purity is fundamental in understanding the properties and behaviors of substances in chemistry.
Complete question:
What is a pure substance ?
what do dots represent in a electron dot diagram and what does the amount of dots tell us about each atom
Dots in a Lewis electron dot diagram represent valence electrons of an atom, and the number of dots indicates the atom's valence electrons. This visual tool helps predict chemical bonding capabilities. For ions, cations show fewer dots and anions have more compared to their neutral atoms.
In a Lewis electron dot diagram, dots are utilized to symbolize the valence electrons of an atom. These dots are arrayed around the symbol of the element and indicate how many electrons are found in the outermost shell of the atom, which are available for chemical bonding. The amount of dots provides insight into the atom's reactivity, with each dot representing a potential for bond formation.
For instance, the Lewis electron dot diagram for hydrogen is depicted with a single dot, as hydrogen has one valence electron. Conversely, a Lewis electron dot diagram for an oxygen atom will show six dots around the oxygen symbol, reflecting its six valence electrons. Moreover, in the case of ions, a cation (positively charged ion) will exhibit fewer dots than its neutral atom counterpart, whereas an anion (negatively charged ion) will display additional dots.
Calculate the average atomic mass for the following elements.
Boron has two naturally occurring isotopes.
80% of all Boron is B11 (6 neutrons)
20% of all Boron is B10 (5 Neutrons)
Average atomic mass =
Closest whole number =
Explanation:
All boron isotopes have 5 protons.
B11 has 6 neutrons, so its atomic mass is:
6 (1.008664 u) + 5 (1.007276 u) = 11.0884 u
B10 has 5 neutrons, so its atomic mass is:
5 (1.008664 u) + 5 (1.007276 u) = 10.0797 u
So the average atomic mass of boron is:
0.80 (11.0884 u) + 0.20 (10.0797 u) = 10.8866 u
The closest whole number is 11.
What is the mass, in g, of one molecule of ethane, C2H6?
A. 3.0 x 10-23
B. 5.0 x 10-23
C. 30
D. 1.8 x 1025
Answer:
B. 5.0 x 10^(-23)
Explanation:
m= n × MM
where
m is mass
n is moles
MM is molecular mass
One molecule of a substance is 1/ 6.022 ×10^23 moles
The molecular mass of C2H6 is the sum of the atomic masses of each of the atoms present in the molecule. 2 carbon atoms + 6 hydrogen atoms. This gives
30.07.
So m= (1/(6.022×10^23)) × 30.07 = 5.0 ×10^(-23)
Mass of a substance can be calculated by using the formula:
Mass (m) = moles (n) × Molar mass (M)
The correct answer is:
Option B. 5.0 × 10²³
Explanation for this is:
Moles is used for measuring a large quantity of small entities like molecules and atoms.1 molecule of substance = 1 / 6.022 ×10²³ molesThe molecular mass of C₂H₆ ethane can be calculated by adding the mass of each atom present in it.Mass of 2 carbon atoms + Mass of 6 Hydrogen atoms
= 2(12) + 6(1)
= 24+6
= 30
So, mass (m) = 30 × 1/6.022 × 10²³= 5.0 × 10²³gm
Therefore, 5.0 × 10²³ gm is the mass of one molecule of ethane.
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Which of the following is an example of a Chemical reaction that you've seen in your everyday life?
Salt dissolving
Ice melting
Water freezing
Fire burning
Answer:
The answer Is fire burning, because the wood being burned is changing to carbon
Answer:
fire burning
If a student analyzes data and finds that they got 0.480 moles of an unknown metal and 0.240 moles of oxygen, what is the mole ratio of metal to oxygen?
Answer:
The ratio of the metal to oxygen is 2:1
Explanation:
Given parameters:
Number of moles of unknown metals = 0.48moles
Number of moles of oxygen = 0.24moles
To find the mole ratio:
We divide the given moles by the smallest values. This gives the simplest form of the two elements:
Elements Unkown metal Oxygen
Number of moles 0.48 0.24
simplest form 0.48/0.24 0.24/0.24
2 1
The ratio of the metal to oxygen is 2:1
The mole ratio of an unknown metal to oxygen, given 0.480 moles of the metal and 0.240 moles of oxygen, is 2:1. This ratio was calculated by dividing the number of moles of the metal by the number of moles of oxygen.
Explanation:The mole ratio of metal to oxygen can be determined by dividing the number of moles of each element by each other. In this case, we are given that there are 0.480 moles of an unknown metal and 0.240 moles of oxygen. To find the mole ratio, we divide the moles of the metal by the moles of oxygen:
Mole ratio = moles of metal / moles of oxygen = 0.480 moles / 0.240 moles = 2:1.
This means for every 2 moles of the metal, there is 1 mole of oxygen, which is the required mole ratio of metal to oxygen.
Writing the Chemical Formula of a Covalent Compound
Phosphorus trichloride is used in the production of chemicals that keep plants from growing in a specific area. This
compound is made of one phosphorus atom represented by the chemical symbol P and three chlorine atoms
represented by the chemical symbol Cl.
What is the chemical formula of this compound?
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1P3C1
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Answer:
PCl₃
Explanation:
If a molecule contains one P atom and three Cl atoms, its formula must be PCl₃.
A is wrong, because the formula PCl means one atom of P and one of Cl.
C and D are wrong, because the formula P₃Cl indicates a molecule consisting of three P atoms and one Cl atom.
Answer:
PCl sub-3
Explanation:
just checked!!!
8) These are the interactions in physical systems that do not appear to be reducible to more basic interactions. They include: gravitational, electromagnetic, strong nuclear, and weak nuclear
Answer:
The fundamental forces or interactions is a term used in physics that explains the Forces that present in nature in their most basic form and cannot be further reduced.
Explanation:
The force of gravitation and the subatomic forces present inside the atom also known as some nuclear reactions and electromagnetic reaction are certain examples of fundamental forces. all these forces are in their basic form of nature.
These all make four such forces while another fifth force is a hypothetical one and is believed to be in existence hypothetically by the scientists.
The scientific method can easily be misinterpreted as a linear cookbook recipe for performing scientific investigations. True or false
Answer: True
Explanation: What this means is that like a cookbook, people misinterpret it as very simple, taking out the problem, bringing an observation then mixing in a few questions, sprinkling a hypothesis put it all in an experiment and the conclusion would just POP OUT OF THE OVEN. But it’s not as simple as that.
if on an average you inhale once every three seconds exactly how many times do you inhale in a 24 hour day
Answer:
28,800
Explanation:
First convert hours to minutes.
60 minutes in an hour so: 24 x 60 = 1,440 (mins)
Second convert minutes to seconds.
60 seconds in a minute so: 1,440 x 60 = 86,400
Divide 86,400 by three. For every three seconds, you inhale once; 3:1 ratio.
86,400/3 = 28,800
This gives us our final answer. You inhale approximately 28,800 times in a 24 hour day.
Which property could be used to identify an unknown substance?
By using Physical properties unknown substance can be identified as it involves determination of a substance with out changing their composition or property include color, odor, taste, density, melting point etc.
What are the difference between physical and chemical property ?Chemical properties can be observed or measured when a substance undergoes any type of changes chemically while Physical properties can be observed without changing anything.
In chemical property, chemical reaction is conducted to show the property of the substance while in physical property No chemical reaction occur.
Chemical properties related to chemical bonds while Physical properties do not have such a relationship.
Chemical properties include radioactivity, toxicity, flammability, heat of combustion, etc. while physical properties include Molecular weight, boiling point, melting point, freezing point, volume, mass, length, density shape, solubility, etc.
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Final answer:
Chemists identify unknown substances by observing and measuring their physical and chemical properties, such as color, mass, and melting point, and comparing them to known values or by noting the chemical changes that they undergo.
Explanation:
To identify an unknown substance, chemists use various properties that can be observed or measured. Among these properties are physical properties like color, state (solid, liquid, or gas), mass (which is related to weight), and texture. Then there are chemical properties which can be discerned through chemical changes that the substance undergoes to produce new matter, as in the case of rust formation from iron, oxygen, and water. To determine if the substance is organic or inorganic, scientists may look for the presence or absence of carbon-based compounds.
Specific laboratory techniques like measuring the melting point can also be used to identify substances. By comparing the melting point of an unknown to literature values, and perhaps mixing a sample with a known substance and retesting, accurate identification can be achieved. If the melting point remains sharp and similar to the literature values, the unknown is likely correctly identified.
In a practical scenario using available lab equipment, such as a laser or ray box and a reference guide of optical properties, a substance's refractive index or how it bends light, might be used for identification. Therefore, physical and chemical properties serve as the basis for identifying unknown substances in chemistry.
Protons are located in the nucleus of the atom. A proton has
a) No charge
b) A negative charge
c) A positive and a negative charge
d) A positive charge
Answer:
d) A positive charge
Explanation:
This is the definition of a proton: a particle in the nucleus that has a positive charge .
Give the number of significant figures: 0.01101 cm
Answer:
4 significant figures
Explanation:
The zero after decimal is not significant figure.
A student mixes two clear liquids together. After a few minutes, a white powdery solid can be seen settling on the bottom of the test tube. Which of the following is a conclusion that the student can draw based on these observations?
A:The two liquids are toxic and should be handled with extreme caution.
B:The two liquids were pure substances before they were mixed.
C:The two liquids have been stored too long and are no longer good.
D:The two liquids have gone through a chemical change in which a new substance called a precipitate was produced.
Answer:
D
Explanation:
Answer:
The correct answer is D; the new substance produced is a precipitate.
Explanation:
Essentially what happened was the two liquids could not mix (insolubility), so a white powder settled at the bottom, which is called a precipitate (residue). This is evidence of chemical change and chemical reaction.
how many sulfur atoms are in 3ZnSO4?
Answer:
One sulfur atom
Explanation:
The compound ZnSO₄ is made up of:
1 atom of Zn
1 atom of S
4 atoms of O
These atoms combines chemically to form the above compound. The coefficient 3 before the compound only shows the number of moles of the compound that are there. Most times, the coefficient balances the chemical equation.
Therefore, we can say 3 moles of ZnSO₄ consists of 1 atom of Zn, 1 atom of S and 4 atoms of Oxygen.
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A scientist had two substances. One was a yellow liquid and the other was a colorless liquid. The scientist added a few drops of the yellow liquid to the colorless liquid. A red solid formed. What most likely happened when the scientist mixed the two liquids?
A. The two substances stayed the same and no new substances were formed.
B. A new substance with properties identical to the colorless liquid was formed.
C. A new substance with properties identical to the yellow liquid was formed.
D. A new substance with properties different from either of the liquids was formed.
Answer:
D. A new substance with properties different from either of the liquids was formed.
Explanation:
This is a simple chemical reaction. When chemical reactions occur, bonds are simply broken and rearranged and new ones formed. Formation of new compounds can be seen and clearly observed. These compounds are completely different in properties from the atoms and compounds that combines to form them.
If they still share the same property in anyway, then, there was only a physical combination of the compounds and this implies the formation of a mixture
Answer:
D. A new substance with properties different from either of the liquids was formed.
The correct option that is the answer for the question is option d
Explanation:
In the given question two liquids of different colours are mixed together. One of them has yellow colour, while the other is colourless on mixing we see that the new substance that is formed is neither yellow nor colourless.
And the mixture that is formed is a substance which is not liquid and solid of red colour and we can conclude, that the mixture form does not retain any property of the elements from which it is made. Hence we can say a new substance with different properties are formed.
Convert 23 in2 to the equivalent number of cm2. Start with the given facts that 12 in = 1 ft and 1 in = 2.54 cm
Please show your work in your answer here. Do not simply google the answer using a unit converter.
Answer:
We are giving that 12 inches make one foot and 1 inch is equivalent to [tex]2.54 cm.[/tex]
Of the given inches in centimetre will be [tex]148. 38 cm^2.[/tex]
Explanation:
Now the value that is given in inches square is 23, to calculate the value of inches given in the question into centimetre we have to multiply the value of inch with [tex]2.54 cm.[/tex]
[tex]23 \times 2.54 \times 2.54= 148.38 cm^2[/tex]
Since the value is given in square hence the centimetre calculated would also be in square that is why [tex]2.54[/tex] needs to be multiplied twice.
Final answer:
To convert 23 in2 to cm2, divide by 144 (to convert to square feet) and then multiply by the conversion factor for square feet to square centimeters.
Explanation:
To convert 23 in2 to cm2, we need to use the given conversion factor of 1 in = 2.54 cm. First, let's convert the square inches to square feet by dividing by 144 (since there are 12 inches in a foot). So, 23 in2 = 23/144 ft2. Next, convert the square feet to square centimeters by multiplying by the conversion factor of 1 ft2 = 929.0304 cm2. Therefore, 23 in2 is equal to (23/144) * 929.0304 cm2 = 18.64162 cm2 (rounded to five decimal places).
How many atoms of silicon are in 1.8mol of silicon?
Answer:
10.836 × 10∧23 atoms
Explanation:
The mole is the unit of amount in chemistry. We know that
1 mole of silicon = 6.02× 10∧23 atoms
The number 6.02× 10∧23 is called Avogadro's number.
Definition:
" Avogadro's number is the number of molecules atoms or ions in one gram molecule of a compound, one gram atom of an element or one gram ions of a substance"
For example:
1 g of hydrogen = 1 mole of hydrogen = 6.02× 10∧23 atoms of hydrogen
18 g of water= 1 mole of water= 6.02× 10∧23 molecules of water
Given data:
moles of sulfur= 1.8 mol
number of atoms= ?
Solution:
one mole of silicon= 6.02 × 10∧23
1.8 × 6.02× 10∧23 = 10.836 × 10∧23 atoms
Explanation:
According to the mole concept there are [tex]6.022 \times 10^{23} atoms[/tex] present in 1 mole of a substance.
Mathematically, 1 mole = [tex]6.022 \times 10^{23}[/tex] atoms or molecules
Therefore, number of atoms of silicon present in 1.8 mol of silicon are as follows.
[tex]1.8 mol \times 6.022 \times 10^{23}}atoms /mol[/tex]
= [tex]10.83 \times 10^{23}[/tex] atoms
Thus, we can conclude that there are [tex]10.83 \times 10^{23}[/tex] atoms of silicon are present in 1.8 mol of silicon.
what causes water to become denser when it is carried to the poles by surface currents??
Answer: Decreased temperatures and increased salinity. Colder water is denser than warm water and the higher the salinity of water the denser it is.
Answer:
D. decreased temperature and increased salinity
Explanation:
Edge Correct Answer
TRUE OR FALSE????
The name for the formula MgI2 is magnesium diiodide.
Answer:
yes that is the name for the formula is magnesium diiodide
False, The formula MgI₂ is correctly named magnesium iodide, not magnesium diiodide. The naming convention for ionic compounds doesn't require prefixes when the simplest ratio of ions is used in the name.
The statement that the name for the formula MgI₂ is magnesium diiodide is FALSE. The correct name for MgI₂ is magnesium iodide. The naming convention for binary ionic compounds involves combining the cation name with the anion name.
Since the magnesium ion has a charge of +2 (Mg²⁺) and each iodide anion has a charge of -1 (I-), two iodide ions are needed to balance the charge of one magnesium ion. However, the prefix 'di' is not necessary in this case because the convention is to use the simplest ratio of ions which is assumed in the name. Thus, for MgI₂, we simply say magnesium iodide.
Turning to other examples to explain how the nomenclature works for binary ionic compounds, magnesium oxide has the formula MgO, which tells us there is a 1:1 ratio of magnesium ions to oxide ions. Similarly, MgCl₂ is called magnesium chloride, indicating there are two chloride ions for every one magnesium ion to balance the charges, resulting in no prefixes being used in the name.
If an object is than water, it will float. If it is than water, it will sink.
Answer: you should realize that if an object weighs more than an equal volume of water, it is more dense and will sink, and if it weighs less than an equal volume of water, it is less dense and will float. Remember that the density of water is about 1 g/cm3.
Explanation:
1) less dense
2) more dense
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