The percentage by volume of oxygen in clean and dry air is approximately
Answer:
[tex]\huge\bf\underline{\underline{\pink{A}\orange{N}\red{S}\green{W}\purple{E}\blue{R}}}[/tex]
ONLY 20.95% IN THE AIR
:)
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which is a greater threat to a mountain ecosystem: a beetle that kills coniferous trees or a wolf thats hunts and eats deer?
Answer:
Explanation:
The mountain ecosystems are characterized by coniferous tree species such as pinus, firs, and spruces and species such as deers, bears, and wolves.
A beetle that kills coniferous trees would be a greater threat to the ecosystem than a wolf that hunts and eat deer because the dominant trees in the ecosystem are conifers. Hence, a beetle that kills coniferous trees might end up killing the dominant tree species in the ecosystem and this will gravely affect other plant and animal species within the ecosystem.
Wolves and deers have their niche in the mountain ecosystem already and hence, their populations are naturally limited by limiting factors of the environment. Hence, a wolf that hunts and eats deers would be of a lesser threat to the mountain ecosystem.
Choose the correct one
Answer:
I believe it is 5 N to the right
Explanation:
Calculate the number of atoms in 2.8 moles of silicon atoms
Answer:
1.686 × 10²⁴ atomsExplanation:
The number of silicon atoms 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 = 2.8 × 6.02 × 10²³
We have the final answer as
1.686 × 10²⁴ silicon atomsHope this helps you
What are some ways that propane, butane, gasoline, diesel, and kerosene can be compared?
Answer:
Propane and butane are pure substances, which means that each one of them is made of only one type of molecule—propane molecules or butane molecules. In contrast, gasoline, diesel, and kerosene are not pure substances; they are mixtures of more than one substance.
Explanation:
Hope it is helpful...
Propane, butane, gasoline, diesel and kerosene are all hydrocarbons. They can be produced from petroleum. All these are used as fuels.
What are hydrocarbons ?Hydrocarbons are organic compounds containing C-C backbone and C-H bonds, These compounds are composed of carbons and hydrogens. Different function groups can be added to the hydrocarbons to form various organic compounds such as acids, esters , aldehydes, ketones etc.
Methane is the first hydrocarbon in the hierarchy based on number of carbons. Propane is third in this series since it contains 3 carbons and butane is 4th one. Gasoline, diesel and kerosene are all hydrocarbons with different carbon numbers.
All these are obtained as a byproduct of petroleum. These are used as fuel in vehicles and house holds. The difference in them is the number of carbon and hydrogen.
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I JUST NEED HELP!!!!
Which group or groups of atoms are the only atoms with f orbitals?
Question 10 options:
A)
All noble gases
B)
All atoms heavier than barium (Ba)
C)
All atoms heavier than krypton (Kr)
D)
Lanthanides and actinides
Answer:
D ( I am probably wrong)
Explanation:
Answer:
All atoms heavier than barium (Ba)
arium has completely filled 5d orbitals and 6s orbitals. After barium, the lanthanide elements occur, in which inner shell 4f-orbitals are filled. So all atoms heavier than Ba possess f-orbitals.
Explanation:
How many atoms of the element with atomic number 11 are in the reactants of the given formula?
2 NaCl + H2SO4 → 2 HCl + Na2SO4
The number of Na atoms in the reactants = 2
Further explanationEvery chemical reaction involves compounds that can act as reactants or products
The reactants will react to produce products
The reactants are usually written on the left side of the reaction, while the products on the right side of the reaction
Reaction
2 NaCl + H₂SO₄ → 2 HCl + Na₂SO₄
The element with atomic number 11 = Na(Natrium)
The number of atoms of the element that reacts or is produced can be seen from the reaction coefficient and the number of atoms in the compound
Na in NaCl = 1 atom
From equation, cofficient for NaCl = 2, so number of atoms of Na=2 x 1 = 2
Hello Hi so um... I don't know what to say so um... yeah MOLLOC WAS HERE!!!!!!!!!!!!!!!!
Answer:
hi nice to meet you, just be your self and ask your questions, its all good we are nice people
Explanation:
have a great day, please mark as brainliest please
Hello! Be ur self, ask questions and ask questions. Okibye
A giraffe is found in the African grasslands. Is this an example of a habitat or a niche
Answer:
Niche i think
Explanation:
90% of people marry there 7th grade love. since u have read this, u will be told good news tonight. if u don't pass this on nine comments your worst week starts now this isn't fake. apparently if u copy and paste this on ten comments in the next ten minutes you will have the best day of your life tomorrow. you will either get kissed or asked out in the next 53 minutes someone will say i love you
Which one has the greatest mass, Hg or Co?
Answer:
Hg
Explanation: I just took the test
What is the balanced form of the equation C2H6 + O2→CO2+H2O?
- 2C2H6 + 7O2→4CO2+6H2O
- C2H6 + O2→CO2+2H2O
- C2H6 + 3O2→2CO2+3H2O
- C2H6 + 5O2→3CO2+5H2O
Answer:
- 2C2H6 + 7O2→4CO2+6H2O
Explanation:
Answer:
2C2H6+7O2-->4CO2+6H2O
Hope this helps!
why is a frozen popsicle a homogeneous mixture and not a pure substance
Answer:
You can not see the sugar.
Explanation:
help please
manganese atom has 30 neutrons and atomic number 25
determine the electron cloud charge of manganese
Answer:
electron cloud charge of manganese=-5
Explanation:
atomic number=number of elecron +neutron number
DATA
Neutron NO.=30
atomic NO.=25
e=?
A=e+n
25=e+30
e=25-30
e= -5
if there are 365 grams of NaCl, how many grams of sodium are there?
Answer: Molar mass is the amount grams that one mole weighs.
Explanation: You need to find the molar mass of NaCl which is the same as the amu on the periodic table in grams. So it is 22.99(Na) + 35.45(Cl) = 58.44
You also know that for every mole of NaCl you have 1 mole of Na because every molecule of NaCl has 1 atom of Na.
Finally, using the periodic table, again, you see that the molar mass of Na is 22.99.
Then using stoichiometry, you can find the grams of sodium.
100(g NaCl) * 1 mol (NaCl)/58.44 g (NaCl) * 1 mol (Na)/ 1 mol (NaCl) * 22.99 (g of Na)/ 1 mol (Na)
which equals 39.339435 g of Na.
If you need to maintain significant figures the answer will be 40.
How many atoms are in HCOOH₂?
Answer:
11 atoms I think
Explanation:
Answer: 3
Explanation:
I took the test!!
Do you think it would be a good idea for a bumper car ride to have minimum and maximum weight requirements for riders? Apply Newton's second and third laws of motion in your response.
Answer: If only max or min yes but if we have min and max that is a bad idea it is not as safe.
Please help me vote you brainiest
Answer: D
Explanation: P = W/t
W = F d
When dividing, if you have a large number over a small, you get a large number. We want a small number, so we want the opposite for our P : W/ t formula. We want a small Work and a large time.
Right off the bat, the two with the least time aren't right then.
From there, we can estimate how much work it would take using the W = F d equation. If there is a small distance, there is less work, which is what we want to achieve a small work over large time.
So, the choice with the most time and the least distance should be correct.
Choose all that are correct about the elements in the column highlighted in blue
in the periodic table below (there are FOUR correct answers)
Answer:
1. Are Metals
2. Are Solids
3. Are Un-reactive
4. Have 18 valence electrons
Explanation:
In a color coded periodic table of the components, the crate for every component is colored. This tone speaks to the classes of components, which incorporate metals, metalloids and non-metals. All in all, the color blue is used for metals, orange for metalloids and green for non-metals. The periodic table might be further tone coded to incorporate different gatherings, for example, transition metals, rare earths, alkali metals, alkaline earths, halogens and noble gases.
The modern periodic table coordinates components by their nuclear number, which is extraordinary to every component. The nuclear number speaks to the quantity of protons in a particle of the component. In the cutting edge occasional table, the nuclear number increments from left to right and through and through. The occasional table is likewise coordinated into periods and groups. Periods are the rows and groups are the columns. The components in every period start with metals on the left side, at that point move to metalloids and afterward to non-metals on the right. The components contained in each group have comparative actual properties.
About ______ impact the creators have been recognized on earth.
A) one thousand
B) 50
C)500
D)150
PLS HELP How many moles of methane are in 7.31x10^25 molecules
Answer:
121.37 moles
Explanation:
I'm not sure
Answer:
1.21 x 10^2
Explanation:
dicarbon heptasulfide chemical formula
Answer:
C2S7
Explanation:
To solve this we must be knowing each and every concept related to chemical formula. Therefore, the chemical formula for the given molecule dicarbon hepta sulfide is C[tex]_2[/tex]S[tex]_7[/tex].
What is chemical formula?A chemical formula is a scientific notation that uses atomic symbol and numerical subscripts to represent the number and types of elements contained in a molecule. A chemical formula seems to be a concise written description of an existing three-dimensional molecule.
A chemical formula characterizes a material to the atomic level. There are three sorts of chemical formulas: empirical, molecular, and structural. The chemical formula for the given molecule dicarbon hepta sulfide is C[tex]_2[/tex]S[tex]_7[/tex].
Therefore, the chemical formula for the given molecule dicarbon hepta sulfide is C[tex]_2[/tex]S[tex]_7[/tex].
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I NEED ANSWER ASAP Which of the following statements is true for a scientific theory? It is a well-tested hypothesis. It is verified by only one scientist. It is based on only one experiment. It is investigated over a short period.
Answer:
A.) It is a well-tested hypothesis.
Answer:
Its is a well-tested hypothesis
Explanation:
i took the test
What is the similarity between teeth and eggshells?
Explanation:
Because they share a similar composition, similar chemicals affect their structures in positive or negative ways. For example, fluoride – a staple in many dental practices – strengthens both enamel and eggshells and helps protect them from acids. Acids weaken and break down both substances. Scientists find this particularly concerning given that the ocean is growing increasingly acidic. They fear this may weaken the eggs of some marine species and harm their chance of survival. Most dentists recommend limiting aggressively acidic foods and beverages such as soft drinks.
What are the two ways ocean acidification affects marine life?
Answer:
1) harm life forms that rely on carbonate-based shells and skeletons, 2) harm organisms sensitive to acidity
Explanation:
Answer:
Ocean acidification can negatively affect marine life, causing organisms' shells and skeletons made from calcium carbonate to dissolve.
Explanation:the more acidic the ocean, the faster the shells dissolve.
In this reaction, how does the rate of forward reaction vary with the concentration of the product?
2H2S(g) ⇌ 2H2(g) + S2(g)
It increases with an increase in the concentration of S2(g).
It decreases with a decrease in the concentration of H2(g).
It increases with a decrease in the concentration of H2(g).
It decreases with an increase in the concentration of S2(g).
It decreases with increase in the concentration of H2(g).
Answer:
c d e
Explanation:
Answer:
C D E
Explanation:
#platogang
Please Answer ASAP!!
What happens to the velocity of an object when balanced forces act on it?
a.
There will be no change
c.
There will be negative acceleration
b.
There will be positive acceleration
d.
Velocity will change, but not acceleration
Please select the best answer from the choices provided
Answer:
C. There is a negative acceleration
Explanation:
I majored in Physics
You discovered a new compound with the following name: Feline (II) Canide. Based on the information below, what would be the correct formula for this compound?
*Canine is a halogen
*Feline has the following symbol: Fi
*Canine has the following symbol: Ci
*Answer choices*
*Fi2Ci3
*FiCi2
*CiFi
*Fi2Ci
Answer:
FiCi2
Explanation:
In relation of Iron(ii) chloride, FeCl2
How many moles of NaOH must be dissolved in 1.00 L of water to make NaOH (aq) with a pH of 12.2?
Answer:
1.58 102 mol
Explanation:
I just looked it up on Quizlet.
1.58 102 moles of NaOH must be dissolved in 1.00 L of water to make NaOH (aq) with a pH of 12.2.
How many moles are present in NaOH?One mole of any substance weighs about the same as the molecular mass of that substance. Hence, the number of moles of sodium hydroxide contained in 160 g of it is 4 moles.
How do I calculate moles?Number Of Moles Formula
1 The formula for the number of moles formula is expressed as.
Given.
2 The number of moles formula is.
3 The number of moles = Mass of substance / Mass of one mole.
4 Number of moles = 95 / 86.94.
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Subject: Chemistry
whoever answers right will give the brainliest.
Answer:
2 A i covalent bond in hydrogen peroxide
ii ionic bond in potassium nitride
iii covalent bond in Aluminum sulphide
2 B i ionic bond in Fe3N2
ii covalent bond in C3F5
iii Ionic bond in Ca3P2
2c roman numerals represent oxidation state of that element.
Explanation:
What would happen if a neutron was added to Lithium (7)
Answer:
if you add a neutron to lithium-7 it becomes a compound nucleus of lithium-8