Answer:
Notice that tellurium is listed before iodine even though its atomic mass is higher. Mendeleev reversed the order because he knew that the properties of iodine were much more similar to those of fluorine (F), chlorine (Cl), and bromine (Br) than they were to oxygen (O), sulfur (S), and selenium (Se).
The tellurium is listed before iodine even though its atomic mass is higher. Mendeleev reversed the order because he knew that the properties of iodine were much more similar to those of fluorine (F), chlorine (Cl), and bromine (Br) than they were to oxygen (O), sulfur (S), and selenium (Se).
What things are in the periodic table?The periodic table is a tabular Form of the chemical elements classified by atomic number, from the element with the least atomic number, hydrogen, to the element with the most atomic number.
The atomic number is the number of protons in the nucleus of an atom.
Thus, The tellurium is listed before iodine even though its atomic mass is higher. Mendeleev reversed the order because of its properties.
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please help, I don't understand chemistry at all.
Density is a physical property of a molecule that’s measured as mass per unit volume.
(a) Given that density is usually expressed in the units of g/cm3
, calculate the density of a cube of plastic that
has a mass of 2.331 g and an edge length of 1.500 cm (volume of a cube is V = l^3
).
Answer:0.691 g/cm^3
Explanation: Density tells us how much mass there is per unit volume of a material. If one has a density of 2 g/cm^3, then a 2 cm^3 chuck of it whould have a mass of (2 g/cm^3)*(2 cm^3) = 4 g.
Since the plastic is in the form of a cube, we can calculate it's volume with the relationship V = l^3, where l is the length. (A box would have a volume of lengthx width x height, but for a cube, l=w=h, so the equation becomes V = l^3.
The colume of the plastic cube is (1.5cm)^3 or 3.375 cm^3. Since this cube has a mass of 2.331 g, we can divide that mass by the cube's volume to find density:
(2.331 g)/(3.375 cm^3) = 0.691 g/cm^3
. Is it possible to have an oxygen atom with 8 protons and another oxygen atom with 9 protons? Explain.
Answer:
no
Explanation:
changing the number of protons will change the atomic number, and if the atomic number is changed, it will become a different element. if you give oxygen 9 protons, it would no longer be oxygen, it would be fluoride.
which is the property of nonmetals to evaporate easily?
Answer:
Volatile
Explanation:
Nonmetal are usually volatile, which means it evaporate easily.
Explain and define the angular momentum quantum number without the internet
Answer:
The angular momentum quantum number, l, describes the shape of the orbital that an electron occupies. The lowest possible value of l is 0, and its highest possible value, depending on the principal quantum number, is n - 1.
A scientist discovers an object in the solar system. She describes it as bigger
than an asteroid, smaller than Mercury, and farther from the sun than Neptune.
What kind of object could it be? Explain.
Answer:
Pluto I think it's the ans
arsenic has an atomic number of 33 and an atomic mass of 75 amu. how many protons are in the element? help is very appreciated! :)
Answer:
33
Explanation:
as the atomic number states the number of protons in each element hope this helps :)
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. The number of proton is 33 when the atomic number is 33 and atomic mass is 75amu.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Every element has different atomic number.
For a given element
atomic number= number of protons = number of electrons
For given arsenic element atomic number is 33 so according to above relation, we can find the number of protons easily.
atomic number=33
number of protons =33
Therefore, the number of proton is 33 when the atomic number is 33 and atomic mass is 75amu.
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a chemist has synthesized a greenish-yellow gaseous compound that contains only chlorine and oxygen and has a density of 7.71 g/l at 36.0 degrees celsius and 2188.8 mm hg. what is the molar mass of the compound?
b.c10²
i dont know if it is right sorry if isn't
help me with this:(((
Answer:
13. A. Kinetic energy increases
14. A. Kinetic energy
15. B. is not transferable
Sorry if I got any wrong, they should be all correct. I tryed.
Chemical properties of earth metals-
Answer:
highly reactive at standard temperature and pressurereadily lose their outermost electron to form cations with a charge of +1What is The particle in the nucleus of an atom that has the same mass of protons but no net charge
Answer:
neutron
Explanation:
neutron and proton has approximately the same mass .proton is positively charged but neutron has no charge
how much phone data do teens use on a daily basis
Answer:
Teens use more phone data then adults because of apps, photos and other things. There is not a certain number for how much data teens use but research says teens use up more than a half of a phone storage. Teens spend from 3-4 hours on phone because of limits but they could spend a whole day.
Explanation:
PLEASE HELP! NO LINKS!!
WILL MARK BRAINLYIST :)
The Periodic Table of Elements contains many patterns that help explain the characteristics of elements. Choose one pattern you have learned and explain what it tells us about elements.
Answer:
let's look at the far left column of the periodic table. this pattern tells us that these elements are the noble gases. Noble gas is all conduct electricity and they are all odorless and colorless. The Roman numeral above this column means that there is one free electron (valence electron) in the outer shell, except for helium which has two. That's why it's a different color from the rest in the same column.
Explain the role of sunlight in the process of photosynthesis
Answer:
When the sun's rays shine down on a plant, the chlorophyll capture the energy from the sun and use it during photosynthesis to make sugars. Sugar is the energy source for plants, that is why sunlight and photosynthesis is so important
The energy from light causes a chemical reaction that breaks down the molecules of carbon dioxide and water and reorganizes them to make the sugar (glucose) and oxygen gas.
I need help with this, I need to know what they mean cause I don’t understand it.
Answer:
The measure of central tendency helps you find the middle or the average, of a data set. The three most common measures of central tendency are the mean, median and mode. The mean is the most frequent value. The median is the middle number in an ordered data set. The mean is the sum of all values divided by the total number of values
Explanation:
Sum of Data (mean) Data in size order (median) Mode
2 +1 + 4+7 + 1 = 15 1, 1 , 2, 4, 7 Most common
15 /5 = 3 value is 1
Mean = 3 Median = 2 Mode = 1
Why do animals eat other organisms? ILL MARK BRAINLIEST
Animals cannot produce their own energy without consuming other organisms.
Animals eat other organisms to get water.
Animals eat other organisms to provide food for decomposers.
Animals are part of the chain that prevents the plant population from disappearing.
Why are birds considered as consumers?
Birds eat decomposers.
Birds eat plants.
Birds eat other organisms for energy.
Birds make their own energy by absorbing chemicals.
Why do you see some animals in different food chains?
Some animals consume more than one type of organism.
Some animals can jump from one food chain to another depending on the season.
Some animals are a food source for different types of decomposers.
Some animals require to eat more because they are bigger.
Why is it possible that some animals may live side by side?
Some animals may consume the same type of plants.
There is a limited amount of space found in ecosystems.
Some animals may not be in the same food chain.
There is a limited amount of water supply in some ecosystems.
Choose the best statement that explains why do organisms need energy?
Energy is necessary only for hunting.
Energy is necessary for cells to function.
Energy is necessary only to make egg and sperm cells.
Energy is only needed during the daytime.
This are the required answers based on the food chain and ecosystem.
If you have any doubts regarding on my answer. Feel free to share the doubts with me in comments section :D
Answer:Animals eat other organisms — Animals cannot produce their own energy without consuming other organisms.
Birds considered as consumers — Birds eat plants.
We see some animals in different food chain — because some animals consume more than one type of organism.
Some animals may live side by side — There is a limited amount of space found in ecosystems.
The best statement that explains why do organisms need energy — Energy is necessary for cells to function.
This are the required answers based on the food chain and ecosystem.
If you have any doubts regarding on my answer. Feel free to share the doubts with me in comments section :D
Explanation:
does freezing involve a chemical reaction
what is the name for the type of subatomic particle that is electrically neutral and found in the nucleus of an atom?
answer : Neutron, neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen.
What is carbon so good for forming the structure of life
Answer:
Because its the basic building block of life
Explanation:
Carbon is essential to life since it is present in nearly all molecules in the body. like, sugars, DNA, proteins, lipids, and so on. Except for water though.
How many moles are in 13.5g of calcium?
Answer:
=0.337mol Ca this is the correct answer :)
Please help me! with this ty
Answer:
Neutron
Explanation:
Protons have a positive charge
Electrons have a negative charge
Neutrons have a neutral charge
what is the expected charge for nitrogen in an ionic compound?
Answer:
3−
Thus, a nitrogen atom will form an anion with three more electrons than protons and a charge of 3−.
Explanation:
What the cm and mm for this
Answer:
5 cm and 50 mm
Explanation:
1 cm = 10 mm
So 5cm = 50 mm
What is the density of this cube?
32 g/cm3
16 g/cm3
64 g/cm3
4 g/cm3
Answer:
32gcm3
so yea i hope this helps u
Answer:
4 g / cm^3
Explanation:
Mass = 32 g
Volume of cube = 2 x 2 x 2 = 8 cm^3
Formula : -
Density = Mass / Volume
Density = 32 / 8
Density = 4 g / cm^3
Which statement is always true when nuclear fusion occurs?(1 point)
The total number of protons and neutrons in each nucleus remains constant.
The number of protons in the resulting nucleus is double that of a starting nucleus.
The combined number of protons and neutrons remains constant.
The number of protons in the resulting nucleus is less than in each starting nucleus.
Use the equation to answer the question.
21H+ 21H→ 42H+energy
Which statement best describes the mass numbers of the atoms in the reaction?
(1 point)
There are two atoms with mass numbers of 2.
There is one atom with a mass number of 2.
There are two atoms with mass numbers of 1.
There is one atom with a mass number of 1.
Which fact is true during a fission chain reaction?(1 point)
The number of freely-moving neutrons increases over time.
The total number of protons will decrease over time.
The total number of protons will increase over time.
The number of freely-moving neutrons decreases over time.
Plsss help
Answer: Which statement is always true when nuclear fusion occurs: The combined number of protons and neutrons remains constant.
21H+ 21H→ 42H+energy
Which statement best describes the mass numbers of the atoms in the reaction? There are two atoms with mass numbers of 2.
Which fact is true during a fission chain reaction? The number of freely-moving neutrons increases over time.
Explanation:
The statement which is always true when nuclear fusion occurs is "the combined number of protons and neutrons remains constant".
What is nuclear fusion?Nuclear fusion is a type of reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles.
The equation 21H+ 21H→ 42H+energy represent that there are two atoms with mass numbers of 2.The true statement during a fission chain reaction is "the number of freely-moving neutrons increases over time".Fission chain reaction is a process in which neutrons released in fission produce an additional fission in at least one further nucleus. This nucleus in turn produces neutrons, and the process repeats.
Read more on Radioactivity:
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Complete the following nuclear equation.
Answer:
oxygen-17
Explanation:
sum of the mass numbers and sum of the atomic numbers should be same in the both sides respectively
Can some one please give me the answers
do carbon dioxide and water have the same molecular geometry?
Answer:
No, the molrcules of water are different from carbon dioxide
Hope it helps you¯\_(ツ)_/¯
correct me if im worng
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I need help with these questions coz I’m colourblind. Pls help.
Answer:
1. In black 6 dyes were used and in green 3 dyes were used
2. 7 dyes were used overall
3. 2-3 blues were used
4. yellow in brown and orange are similar shade
Not sure about the other image
Save the ________ used to extract metals.
Answer:
Save the *minerals* used to extract metals.
Write down the ratio of the atom present in the formula for each of the compound. a) Sodium Carbonate , Na2CO3 b) Glucose, C6H12O6
Answer:
what subject is this? science?