Answer:
D is balanced. :)
Among the following equations the one that represents the balanced equation for the reaction of iron and oxygen is a.
4Fe + 3O₂ → 2Fe₂O₃
What is balancing of a reaction?Balancing of a reaction is done according to the "Law of conservation of mass" and balancing helps in solving stoichiometry questions correctly as if we will not balance the reaction then the quantitative results in a particular question doesn't come correctly.
Balancing of a reaction helps in mole concept as well and it is one of the laws of chemical reactions as well.
Some examples of balanced chemical reactions are-
2Mg(s) + O₂(g) ⟶ 2MgO(g)
Ca(OH)₂ + H₃PO₄ → Ca₃(PO₄)₂ + H₂O
Therefore, Among the following equations the one that represents the balanced equation for the reaction of iron and oxygen is a.
4Fe + 3O₂ → 2Fe₂O₃
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Which of the following correctly lists the levels of organization from most complex to least complex? *
Community, Organism, Population, Ecosystem
Ecosystem, Community, Population, Organism
Population, Community, Ecosystem, Organism
Organism, Population, Community, Ecosystem
Answer:
The last option.
Explanation:
You can immediately eliminate the other options as an organism is clearly the least complex. Only one option begins w/ 'organism'.
Answer:
Its def A, if this helped subscribe to amiredagoat Yt
Explanation:
The burning of a sample of propane generated 1 04.6 kJ of heat. All of this heat was used to heat 500.0 g of water that had an initial temperature of 20.0/C. What was the final temperature of the water?
Answer: 70.0°C
Explanation:
Quantity of heat = Mass * Specific heat * Change in temperature
Quantity of heat = 104.6 KJ
Mass = 500.0 g
Specific heat of water is 4.18 J/g°C
Change in temperature assuming final temperature is x = x - 20
Units should be in grams and joules:
104,600 = 500 * 4.18 * (x - 20)
104,600 = 2,090 * (x - 20)
x - 20 = 104,600/2,090
x = 104,600/2,090 + 20
x = 69.8
= 70.0°C
How is a carbon atom different from a hydrogen atom?
Answer:
Carbon atom is a chemical element with the symbol C and atomic number 6 ( electrons). While Hydrogen atom is an atom of the chemical element hydrogen that have only 1 electron.
Explanation:
The carbon atom different from a hydrogen atom, because the atomic number of hydrogen is 1 . The atomic mass number of hydrogen is also one. For the carbon atom, the atomic number is 6, and the atomic mass number of carbon is 12.
What is an atomic number ?The term atomic number is defined as the number of a chemical element in the periodic system. The elements are arranged in order of increasing number of protons in the nucleus.
The atomic number is situated at the upper left, or number of protons. In the middle is the letter symbol for the element. Atomic number is equal to the proton number or the number of protons found in the nucleus of every atom of that element.
Thus, Carbon atom is a chemical element with the symbol C and atomic number 6. Whereas hydrogen atom is an atom of the chemical element hydrogen that have only 1 electron and its symbol is H.
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Apart from cost, give three reasons why steel should be recycled
Answer:
Well, acutally it shouldnt..but why it should be recycled is because 1. you can use it for many nessactities such as cars and blades, and bikes
You should also recycle it for, scrap parts! so just in case if you need recycled steel ya know where to get it
Lastly, you should recycle steel because of its value. If you recycle steel then melt it, and make well i dont know, a blade out it, you might have just made something, and then think, "Well that was fun and easy, i wanna use more recycled items to build or forge things
Explanation:
Hope this helps and pls mark brainlest!
Answer:
i think because its cause pollution
Explanation:
when making steel a lot of pollution goes in the atmosphere so if you recyle the the steel we may less pollution [ im only 12 so im sorry if this was wrong]
Find the number of moles if you have 1.2 x 1048 copper atoms.
Answer:
1.993 × 10^(24) moles
Explanation:
From avogadro's number, we have that;
1 mole of atoms contain 6.022 × 10^(23) atoms
Therefore, 1.2 x 10^(48) atoms of copper will contain;
(1.2 x 10^(48) × 1)/(6.022 × 10^(23)) = 1.993 × 10^(24) moles
1.
Many plants can reproduce asexually. How is this an advantage for the plant? Why can it sometimes be a disadvantage
for the plant? Use details to support your answer.
Answer:
Advantage and disadvantage of asexual reproduction in plant is described below in details.
Explanation:
An advantage of asexual reproduction is that the resulting plant will approach adulthood quicker. Since the new plant is emerging from a grown-up plant or plant components, it will also be stronger than a seed. Asexual reproduction can take a spot by natural or manufactured (assisted by humans) means.
The significant disadvantages of asexual reproduction are the Shortage of diversity. Following the seeds are genetically the same as the parent they are more sensitive to the same diseases and nutrient insufficiencies as the parent. All the negative deviations endure for generations.
Which is the balanced version of the half-reaction below?
Answer:
The answer is B
Explanation:
Because H2S →S + 2HplusConvert 4.5 x 10-3 to standard Notation
Posted today at 6:30 am
1
=
Answer:
0.0045
Explanation:
Scientific notation is the way to express the large value in short form.
The number in scientific notation have two parts.
The digits (decimal point will place after first digit)
× 10 ( the power which put the decimal point where it should be)
for example 4.5×10⁻³
In standard notation
4.5 / 10³
0.0045
The expanded notation is standard notation of writing the numerical values which is normal way. The numbers are written as they are, without the power of 10.
what percent of the sun's energy is used by the living organism on earth
a. 1%
b. 10%
c. 20%
d. 35%
e. 50%
Answer:
1% A
Explanation:
Calculate the number of atoms in 3.21 mole of Mg?
Answer:
1.93 × 10²⁴ atomsExplanation:
The number of atoms in a substance can be found by using the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 3.21 × 6.02 × 10²³
We have the final answer as
1.93 × 10²⁴ atomsHope this helps you
All of the following rivers are labeled on the map above except the __________ River.
A. Danube
B. Volga
C. Lena
D. Ob
Order the following atoms from smallest to largest atomic radius: C, N, P
Answer:
N ∠ C ∠ P
Explanation:
Atomic radius:
It is define as the distance from nucleus of an atom the outer most electronic shell.
As we move down the group atomic radii increased because of increase of atomic number. Electrons are added in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
When we move from left to right across the periodic table electron are added in the same shell at the same time protons are also added in the nucleus hence positive charge is going to increase and this effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus and atomic radii decreases.
Carbon and nitrogen are present in period 2 while phosphorus is present in period 3 thus phosphorus has largest atomic radii. Carbon and nitrogen are present in same period but nitrogen is more right as compared to the carbon which means nitrogen has one more valence electron thus its size is smaller than carbon.
Values of atomic radii.
P = 98pm
C = 67pm
N = 65 pm
N ∠ C ∠ P
Molecules have Question 10 options: A) both potential and kinetic energy. B) neither kinetic nor potential energy. C) only potential energy. D) only kinetic energy.
Answer:
B?
Explanation:
If X is the symbol of an element, which pair correctly represents isotopes of X
Answer:
What pair???
Explanation:
Answer:
C is the pair that represent the isotopes of x
PLEASE HELPPP!!!!!! ASAP!!!!
Which of the following best describes cations? Question 19 options: A) They're negatively charged because they lost an electron. B) They're positively charged because they gained an electron. C) They're positively charged because the number of electrons remained the same. D) They're positively charged because they lost an electron.
Answer:D
Explanation:trust me bro
Answer:
D
Explanation: I took the test
electron configuration for Li
Answer:
the electronic configuration of Li is
=》 2, 1
and in spdf configuration it's 1s^2 2s^1
Answer: [He] 2s1
Explanation:
Electrons per shell: 2,1
Atomic number: 3
Electronegativity: 0.98
Atomic mass: 6.941 u
Discoverer: Johan August Arfwedson
Period: Period 2 element
I'm very confused please help
Answer:
the food chain you mean
Explanation:
pollution than mosquitoes then alligators
PWEaseee help mweee ill mark brainliest I just need the answer pls and thank you amazing people
What is the definition of hydro energy
Answer:
a form of energy that harnesses the power of water in motion—such as water flowing over a waterfall—to generate electricity.
Explanation
When placed in distilled water, the pH of metal oxides will be?
Less than 7
Equal to 7
greater than 7
neutral
When placed in distilled water, the pH of metal oxides will be greater than 7. The correct option is C.
What are metal oxides?Metal oxides are crystalline solids containing both a metal cation and an oxide anion. In most cases, they react with water to form bases or with acids to form salts.
Metal oxides are compounds that contain two elements, namely a metal and an oxygen atom. Examples include sodium oxide (Na2O), magnesium oxide (MgO), calcium oxide (CaO), and others.
When metal oxides react with dilute acids, they form salt and water, demonstrating that they are basic.
Metal oxides are alkaline. When we dissolve them in water, we get solutions with pH values higher than 7. The reaction between a nonmetal and oxygen produces nonmetal oxides. Nonmetal oxides are highly acidic.
Thus, the correct option is C.
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Fun fact! <3
An apple, potato, and onion all taste the same if you eat them with your nose plugged
Answer:
:O Fr? Bet let me go get them lol
✧ Yes, since one of our senses are missing we won't really detect the taste.
Explanation: Think about it, we usually smell food and we can already tell if it's going to taste good or not. Looking or touching food doesn't always help to know if we will like the taste. ✧
5. CaCO, - CaO+CO,
Reaction Type
Answer:
(a) Decomposition: A substance breaks down to smaller species. [e.g. CaCO3(s) → CaO(s) + CO2(g) Decomposition of limestone to calcium oxide (quicklime) and carbon dioxide on heating.]
WHICH COMPOUND HAS BONDS WITH THE LEAST DEGREE OF POLARITY (LEAST POLAR)?
Explanation:
H−S has least polarity in the bond because the electronegativity difference between H and S is the least.
hi...need help....thank you..
Answer:
36 oxygen atoms
Explanation:
From the question given above, the following data were obtained:
Compound => 4Al₂(CO₃)₃
Number of Oxygen atom in the compound =?
The number of oxygen atom in the above compound can be obtained as follow:
4Al₂(CO₃)₃
Al = 4 × 2 = 8 atoms
C = 4 × 3 × 1 = 12 atoms
O = 4 × 3 × 3 = 36 atoms
From the simple illustration made above, there are 36 oxygen atoms in the compound.
what are all the populations of different species that live in the same area at the same time
Answer:
The answer is Community
Explanation:
Balancing Equations
Fe + O2 --> Fe2O3
Answer:
4Fe + 3O2 --> 2Fe2O3
Explanation:
During ____, the chromatin condenses to make ____.
prophase, chromosomes
metaphase, chromosomes
prophase, DNA
metaphase, DNA
What happens when liquid changes to gas?
1.Added heat makes water molecules move fast enough to overcome the attraction
between them
2. Heat causes molecules to speed up and merge together (Which one?)
Answer:
#1
The temperature that this happens is called the freezing point and is the same temperature as the melting point. As more energy is put into the system, the water heats up, the molecules begin moving faster and faster until there is finally enough energy in the system to totally overcome the attractive forces.
Explanation:
#2
Heating a liquid increases the speed of the molecules. An increase in the speed of the molecules competes with the attraction between molecules and causes molecules to move a little further apart. ... A decrease in the speed of the molecules allows the attractions between molecules to bring them a little closer together.
HELP ME PLZ IT WILL MEAN A LOT
Answer:
1. B
2.C
Explanation:
I just used logic, it's been a while since I've done this but right now I'm in Honors Chemistry and I think I have the qualifications to answer this question. Sorry if I'm wrong.
Which element, If combined with lodine, will have the greatest attraction for the lodine electrons?
C
P
B