The Periodic Table of elements is arranged by:
O atomic mass
O number of neutrons
O number of electrons
O atomic number
Answer:
atomic number
Explanation:
Answer:
number of electrons and number of neutrons
which type of matter cannot be broken done into simplier substances by a chemical change
Answer: Because atoms cannot be created or destroyed in a chemical reaction, elements such as phosphorus (P 4) or sulfur (S 8) cannot be broken down into simpler substances by these reactions. Example: Water decomposes into a mixture of hydrogen and oxygen when an electric current is passed through the liquid
Explanation:
Answer:
elements because they are the simplest form of matter so they can't be broken
Explanation:
Hope this helps:)
what are 2 physical changes in the carbon cycle?
Answer:
Today, the carbon cycle is changing. humans are moving more carbon into the atmosphere from other part of the earth system. more carbon is moving to the atmosphere where fossil fuels, like coal and oil, are burned.more carbon is moving to the atmosphere as you may get rid of forest by burning the tree
Explanation:
hope this give you a hint
A scientist thinks that ducks swim faster when they are in cold water. He tests two groups of ducks, one in cold water and one in room temperature water. He records how fast they swim.
Experimental Group:
Control Group:
Which contribution is a modification to Thomson's plum pudding model?
Atoms are indivisible.
Electrons are scattered in an atom.
A positively charged nucleus sits at the center of an atom.
Atoms of the same element have the same properties.
Answer:
Option C: A positively charged nucleus sits at the center of an atom.
Explanation:
Thompson’s plum pudding model was a model proposed by Thompson to show that an atom consisted of more than one fundamental unit.
In Thompson's model, he suggested that the atom consisted of a cloud of positive charges which were surrounded by electrons which are negative charges distributed throughout.
Now, Thompson's experiment was later rejected by Ernest Rutherford when he carried out the gold foil experiment and came to the conclusion where he proposed a model that the atom consisted of mainly empty space and that all its positive charge are concentrated at its center and further surrounded by a cloud of electrons.
From the given options, the correct one is Option C.
Answer: Option C: A positively charged nucleus sits at the center of an atom.
Explanation:
If you go to the moon your mass would ___.
stay the same
increase
Answer:
stay the same
Explanation:
you would weigh less if u stood on a scale but you're still the same mass unless you chopped of a body part or something
235/92 U + 1/0 n -> 138/55 Cs + 96/37 Rb + 2 1/0 n
what kind of reaction?
Answer:
Nuclear fission
Explanation:
This reaction is called a nuclear fission reaction. In this reaction, a radioactive decay process occurs in which a heavy nucleus spontaneously disintegrates into two lighter nuclei and several neutrons, with the release of a large amount of energy.
The imbalance between the number of neutrons and protons is responsible for this spontaneous disintegration. Until a stable daughter cell forms, the reaction proceeds.The expression of the speed of light can be written as: (C =
Answer:
The expression of speed of light can be written as "c".
Explanation:
The speed of light is denoted by c. It is originated from the Latin word celeritas which means "speed". Its value is 3×10⁸ m/s.
It is related to the frequency and wavelength as follow,
Speed of light = wavelength × frequency
c = λ × f
λ = c/f
This formula shows that both frequency ad wavelength are inversely related to each other.
Frequency is taken in Hz.
It is the number of oscillations, wave of light make in one second.
Wavelength is designated as "λ" and it is the measured in meter. It is the distance between the two crust of two trough.
If a football is 625 mL volume and 0.64 g/mL density what is the mass
Each of the atoms in alkali earths metal Family( group 2) has ___ valence Electrons .
Pleasee help I’ll mark you as brainlister
Fill in the blank
Answer:
the answer is 2 valence electrons
what's the difference between series and parallel circuit in table form?
PLEASE HELP WILL GIVE BRAINLIEST
(GIVING BRAINLIEST)
Balance each of the following chemical equations below
Explanation:
A.
AgNO₃ + KCl → AgCl + KNO₃ (Already Balanced)
B.
H₂O + SO₃ → H₂SO₄ (Already balanced)
C.
2KI + Cl₂ → 2KCl + I₂
D.
2NaHCO₃ → Na₂CO₃ + H₂O + CO₂
E.
Zn + 2HCl → ZnCl₂ + H₂
F.
BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl
G.
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
H.
2Al + 3CuCl₂ → 2AlCl₃ + 3Cu
Heat rising in a hot-air balloon is an example of __________. conduction convection radiation solar
Answer:Condensation
Explanation:
it
Answer:
convection
Explanation:
I took test I got 100%
What do these two changes have in common?
using a large magnet to remove pieces of iron from a junkyard
rain forming in a cloud
Select all that apply.
Both are caused by heating.
Both are only physical changes.
Both conserve mass.
Both are chemical changes.
Answer: Both are only physical changes.
Explanation:
Both are only physical changes.
• The material, which takes part in the change is structurally similar after and before the change is known as the physical change.
• The cloud formation is a physical change as when evaporation of water takes place it goes into the air and produces cloud by the process of condensation. The same water goes back to earth by the process of precipitation and this get repeated again and again.
• A chemical change takes place when formation of new substance takes place by combining two substances. In the case, when a magnet picks up iron in a junkyard, one is still having an iron and a magnet, no formation of substance is taking place. So it is a physical change.
Thus, both the given processes are examples of only physical changes.
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Which of the following statements regarding the moon and Earth is correct? Question 9 options: A) The moon is older than Earth by approximately 300 million years. B) Earth is tidally locked, while the moon spins on its axis. C) Earth and the moon have nearly the same mass. D) Earth and the moon are nearly the same age.
The statement 'The moon is older than Earth by approximately 300 million years' is True (Option A).
When did the Moon form?The Moon formation refers to the geological period of time in which our natural satellite emerged as an independent celestial body.
It has been proposed that the Moon emerged first compared to the Earth (approximately 300 million years).
In conclusion, the statement 'The moon is older than Earth by approximately 300 million years' is True (Option A).
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How much does a sample of C6H12O6 weigh if it contains 1.7 x 10^28 hydrogen atoms?
Answer:
Explanation:
Glucose has 6 number of carbon atoms, 12 atoms of oxygen and 6 atoms of oxygen
The total number of glucose atom is 24 atoms
The atom of hydrogen is twice that of carbon
that is (6.02 x10^22) x2=1.204 x10^23atoms
the number of moles of hydrogen is solved as follows
1mole = 6.02x10^23 atoms what about 1.204 x10^23=
{(1.204x10^23)/(6.02 x10^23)}=0.2moles
The moles of glucose
1 atom of glucose= 6.02 x10^22 x4 =2.408 x10^23 atoms
moles= { (2.48 x10^23)/(6.02 x10^23)}=0.41moles
Hope this helped :)
An aluminium atom has a mass number of 27 and a proton number of 13. How many neutrons does this aluminium atom contain?
Explanation:
14 neutrons
Explanation: The mass number is the total number of protons and neutrons in a nucleus. The atomic number is the number of protons in the nucleus. →27−13=14 neutrons!
Help plsss!
If the average atomic mass is 39.948amu, which isotope is more abundant?
Answer:
It depends on which element you are talking about. I appears that no element has an average atomic mass of that number. So, for the question, if it assumes that there are two isomers with 39 amu and 40 amu, then the 40 amu one would be more abundant. But again, there are different possible isotopes and I can't tell what the question wants.
PLEASE I NEED HELP ASAP.
Al = 13 protons, 10 electrons, 14 neutrons
S = 16 protons, 18 electrons, 17 neutrons
P = 15 protons, 18 electrons, 19 neutrons
Hope this helped!
how is iodine 131 different from a normal atom of iodine?
Answer:
Iodine 131 is an unstable/radioactive isotope of iodine and a normal atom of iodine is stable.
Explanation:
1 mole of a gas occupies 22.4 L at ________
Answer: At STP, one mole (6.02 × 1023 representative particles) of any gas occupies a volume of 22.4 L (Figure below). A mole of any gas occupies 22.4 L at standard temperature and pressure (0°C and 1 atm).
Explanation:
That the answer
1 mole of a gas occupies 22.4 L at (0°C and 1 atm). It is the standard temperature and pressure.
What is Avogadro's hypothesis?Avogadro's hypothesis says that all gases have an equal number of particles at the same temperature and pressure.
The empty space between the particles makes up the majority of a gas's overall volume.
Due to this, the size of the particles themselves is nearly insignificant.
The volume of one mole of a gas at standard temperature and pressure is known as the molar volume.
Thus, the correct option is 0°C and 1 atm.
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Which term describes this molecular shape?
A. Tetrahedral
B. Bent
C. Trigonal planar
D. Linear
Answer:
A
Explanation:
Tetrahedral
The term that describes the molecular structure is Tetrahedral. The correct option is A.
What is molecular structure?The molecular structure is the structure of the molecular compounds. It tells the presence of ions and bonds in a compound. It is the arrangement of atoms, groups, or ions in a molecule, as well as the quantity and distribution of chemical bonds.
The use and importance of molecular structure are comprehending Nature's complex design principles and blueprints depend on understanding molecular structure.
Perhaps we can start to imitate her lovely items more cheaply and with less negative environmental effects if we can comprehend her plans and fundamental materials. The given compound is tetrahedral.
Thus, the correct option is A. Tetrahedral.
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What does it mean for an element to be oxidized?
A. The element is a spectator ion in a chemical reaction.
B. The element has gained one or more electrons in a reaction.
C. The element has lost one or more electrons in a reaction.
D. The element has bonded to another element with opposite charge
Answer:
B
Explanation:
Oxidation occurs when an atom molecule or ion loses one or more electrons in a chemical reaction when oxidation occurs the oxidation state of the chemical species increases oxidation doesn't necessarily involve oxygen originally the term was used when oxygen caused electron loss in a reaction hope this helped. :)
An element is oxidized when It has loses one or more electrons in a chemical reaction. Therefore, Option (C) is correct.
What is Oxidation ?The loss of electrons, gain of oxygen or loss of hydrogen will be considered as Oxidation.
The gain of electrons, loss of oxygen or gain or hydrogen will be considered as the Reduction.
Rusting is one of the popular example of oxidation.
Therefore, An element is said to be oxidized when It has lost one or more electrons in a reaction.
Hence , Option (C) is correct.
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help :(
If 4.7 moles of oxygen gas are allowed to react with 3.9 moles of iron according to the following equation:
4 Fe + 3 O2 → 2 Fe2O
How many moles of Fe2O3 can be formed?
Moles of Fe₂O₃ formed : 1.95
Further explanationA reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
[tex]\tt 4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]
We find the limiting reactant from the ratio of the mole and the reaction coefficient
Fe ⇒ 3.9 : 4 = 0.975
O ⇒ 4.7 : 3 = 1.56
Because the ratio of Fe is smaller, then Fe becomes the limiting reactant
Reaction
4Fe + 3O₂ ⇒ 2Fe₂O₃
mol Fe₂O₃ from mol of Fe as limiting reactant
mol ratio Fe₂O₃ : Fe = 2 : 4, then mol Fe₂O₃ :
[tex]\tt =\dfrac{2}{4}\times 3.9=\boxed{\bold{1.95}}[/tex]
write down the similarities and differences of Continental and temperature climatic zones
Answer:
Temperate climates, otherwise known as meso-thermal climates, are cooler than subtropical climates, but warmer than polar climates. A continental moderate climate is another sub-type of temperate climates. These regions have hot, rainy summers and cold, dry winters.
Explanation:
What did you find out from this investigation? Be thoughtful in your answer.
Which orbital indicated on the periodic table???
S
P
D
F
Help ASAP I’ll mark as brainlister:)
Which of the following neutral atom configurations satisfies the octet rule?
1s2 2s2 2p6 3s2 3p6
1s2 2s1
1s2 2s2 3s2 3p4
1s2 2s2 3s2 3p6 4s1
Answer:
2
Explanation:i did the test
calculate the atomic mass of carbon if the two common isotopes of carbon have masses of 12.000 amu (98.89% abundance) and 13.003 amu (1.11% abundance)
12.01 amu
Work:
(12.000 × .9889) + (13.003 × .0111) = 12.01
turn the precents into decimals