Answer:
Diatomic molecules are molecules made of two atoms. The atoms can be of the same element (diatomic elements) like in H2, N2, and O2, or of different elements (diatomic compounds) like in HCl, NaCl, and KBr.
In contrast, monatomic elements consist of single atoms, like Ar, He and Ne.
what did theodor schwann do??? for the cell theory (what is the theory)
He concluded that all tissues are made up of cells.
Theodor Schwann, along with Matthias Jakob Schleiden, is credited with the formulation of the Cell Theory in 1839, which postulates that all living things are comprised of cells, the cell is the essence of biological structure and function, and that new cells are produced from the division of existing cells.
Theodor Schwann, a renowned zoologist, together with botanist Matthias Jakob Schleiden, contributed to one of the fundamental concepts in biology known as the Cell Theory. After extensive observation and research, they proposed that cells form the elementary building blocks of all living organisms and that all life is cellular in nature. This discovery laid the groundwork for modern biology and emphasized the universal importance of the cell as the basic structural, functional, and biological unit of all living organisms. Schwann's pivotal work highlighted that the cell is not merely a random assortment of matter, but a complex and dynamic unit vital for life. Further contributions by Rudolf Virchow, who added the idea that new cells can arise only from other pre-existing cells, completed the robust framework of the theory that continues to underpin biological research and understanding to this day.
what is the relstionship between a mutatation and gene
Answer:
D
Explanation:
What’s the name of this element and what is the reactivity?
When 2.5000 g of an oxide of mercury, (HgxOy) is decomposed into the elements by heating, 2.405 g of mercury are produced. Calculate the empirical formula.
In the given question,
HgxOy (2.50 g) = xHg (2.405 g) + yO
Here, mass of oxygen = 2.50 - 2.405
= 0.095 g
The moles of O₂ = 0.095 / 16 = 0.00594 moles
Moles of Hg = 2.405 / 200.60 = 0.01198 moles
Thus, the ratio of Hg : O is,
0.00594 : 0.01198 or 1 : 2
As the ratio is 1 : 2, thus, the empirical formula is Hg₂O
Given a mixture of sand and water, state one process that can be used to separate water from the sand
use filtration because sand isn't soluble in water.
Filtration is the process used to separate water from sand in a heterogeneous mixture, utilizing filter paper to allow water to pass through while retaining the sand particles.
One process that can be used to separate water from sand is filtration. This technique is used to separate a heterogeneous mixture of a solid and a liquid. When you have a mixture of sand in water, you can pass this mixture through a filter paper. The water will flow through the filter paper, while the sand particles are caught by the filter, thus separating the two components.
Filtration keeps the physical properties of the substances intact as it is a mechanical means of separation, requiring no chemical process. The sand remains as sand, and the water remains as water after the filtration process. This is a simple yet effective method to use if you need to separate solid materials from liquids, such as in the case of a sand and water mixture.
Victoria has a crate of vegetables that weighs 100 newtons. She exerts a force of 100 newtons to lift the crate with a pulley. What’s the mechanical advantage in this situation?
A. less than 1
B. equal to 1
C. equal to 0
D. more than 1
Simply put, MA = Force Out / Force in. That's the way it is usually stated. The force out is normally what you need to move. The force in is what you need to supply to get the force out. Most machines will give you an MA of more than 1. Some (like your arm) will give you less than 1 and others (like this one) will give you exactly one.
This one is frictionless, otherwise it would slip into less than one if it had friction.
Answer B
Answer:
Mechanical advantage in this situation is equal to 1.
Explanation:
The mechanical advantage of a simple machine gives a relationship between the input force applied to the output force. Mathematically, it is given by :
[tex]MA=\dfrac{F_o}{F_i}[/tex]
Where
[tex]F_o\ and\ F_i[/tex] are output force and input force
In this case, the weight of the crate of vegetables is 100 N
Force exerted by her to lift the crate with a pulley is 100 N
The mechanical advantage in this situation is given by :
[tex]MA=\dfrac{100}{100}=1[/tex]
So, the mechanical advantage in this situation is equal to 1. Hence, the correct option is (b) "equal to 1".
what is the name for B2(SO4)3
Answer:
The chemical formula B2(SO4)3 represents boron sulfate.
What substance cannot be broken down by chemical change
Potassium is the simplest form of matter and therefore can not be broken down by chemical change.
what is our ultimate source of energy on earth
what is our ultimate source of energy on earth
The sun is our ultimate source of energy, silly!
The ultimate source of energy on Earth is the sun, which powers life and processes through nuclear fusion. Its energy supports photosynthesis and is stored in fossil fuels, while modern solar technology enables us to harness this energy directly.
Explanation:The ultimate source of energy on Earth is the sun. This massive celestial body fuels virtually all processes and life forms on our planet. Through a process called nuclear fusion, the sun converts hydrogen into helium, releasing vast amounts of energy that travel to Earth as sunlight. This energy is critical for photosynthesis, the process by which plants produce food, thereby supporting the food chain and various ecosystems. Besides, the sun's energy is stored in fossil fuels like coal and petroleum, which are remnants of ancient plants and animals.
Although these fossil fuel resources are finite and will eventually deplete, the sun represents an essentially unlimited supply of energy. Modern solar technology, including photovoltaic cells, harnesses this sunlight directly to produce electricity, offering a renewable and sustainable alternative to fossil fuels. Solar energy's challenge lies in efficiently capturing and converting it to meet global energy demands.
how to distinguish a solution of sodium sulphite from a solution of sodium sulphate in the lab
We have to distinguish a solution of sodium sulphite from a solution of sodium sulphate in the laboratory.
Solution of sodium sulphite is acidified with dilute HCl and to that when few drops of barium chloride (BaCl₂) solution is added, white precipitate is formed. The white precipitate is soluble in HCl.
To this solution 2 drops of iodine (I₂) solution is added and brown colour of iodine is discharged as I₂ gets reduced to HI.
The reactions involved in case of sodium sulphite is are:
Na₂SO₃ + BaCl₂ = BaSO₃ ↓ + 2NaCl
(white precipitate)
BaSO₃ + 2HCl = BaCl₂ + H₂SO₃
H₂SO₃ + I₂ + H₂O = H₂SO₄ + 2HI
On the other hand, solution of sodium sulphate is acidified with dilute HCl and to that when few drops of barium chloride (BaCl₂) solution is added, white precipitate is formed. The white precipitate of BaSO₄ is formed which is insoluble in HCl.
Na₂SO₄+ BaCl₂ = BaSO₄ ↓ + 2NaCl
(white precipitate)
in the reaction C5H8+____ O2= 8H2O+5CO2
give 2 examples of energy transformation that occur when making toast in a toaster oven
When making toast in toast oven, the following energy transformation occur
a) electric energy is converted to heat energy which heat up the filaments of toaster, which helps in roasting of toast.
b)the heat energy is transferred to bread or toast
When making toast in a toaster oven, energy transformations occur from electrical energy to thermal energy, and from thermal energy to radiant energy.
Explanation:When making toast in a toaster oven, two examples of energy transformation that occur are:
Electrical energy to thermal energy: The electrical energy from the power source is transformed into thermal energy when the toaster oven heats up the heating elements inside.Thermal energy to radiant energy: The thermal energy produced by the heating elements is transformed into radiant energy in the form of infrared radiation, which then heats up the bread slices and transforms them into toast.Learn more about Energy transformations in a toaster oven here:https://brainly.com/question/11751233
#SPJ12
Clary ran 20 miles in four hours. What was her average speed?
5 miles per hour
20/4=5
what factor distinguishes a metallic bond from an ionic bond or a covalent bond
The answer to this question is:
The mobility of electrons.
Have a Great Day! ! Hope This Helps!
If you have anymore questions, Just ask me!
Mark Brainliest If anyone Else Answers Please to help me get to the next Rank!
#RoadToVituoso!
- Innverted
Answer:
The ionic bond occurs between two different atoms (metal and nonmetal), while the covalent bond occurs between two equal atoms (nonmetals),
Another difference between these is that the covalent bond is an electron compartment, while in the ionic bond there is an electron transfer.
Metal bonding occurs when metals are combined with each other. Metal atoms need to give up electrons to reach the configuration of a noble gas. In this case, the metals lose the valence electrons and an electron cloud forms between the positive nuclei.
Plants are able to produce special chemicals at the right time and place.
True
or
False
TRUE its glucose if they have sunlight
Hi There,
The answer is:
True
Hope this helps have a great day :)
A compound has a molar mass of 92.02 grams/mole, and its percent composition is 30.4% nitrogen (N) and 69.6% oxygen (O). What is its molecular formula? A. N2O4 B. NO2 C. N2O D. N4O2
The answer is: A. N2O4.
M(NₓOₙ) = 92.02 g/mol; molar mass of unknown compound.
If we take 100 grams of sample:
m(N) = 0.304 · 100 g.
m(N) = 30.4 g; mass of nitrogen.
n(N) = 30.4 g ÷ 14.01 g/mol.
n(N) = 2.17 mol; amount of nitrogen.
m(O) = 0.696 · 100 g.
m(O) = 69.6 g; mass of oxygen
n(O) = 69.6 g ÷ 16 g/mol.
n(O) = 4.35 mol; amount of oxygen.
n(N) : n(O) = 2.17 mol : 4.35 mol.
n(N) : n(O) = 1 : 2.
Answer is N₂O₄ or NO₂, so we must find molar mass.
M(N₂O₄) = 2Ar(N) + 4Ar(O) · g/mol.
M(N₂O₄) = 92.02 g/mol.
Final answer:
The molecular formula for the compound with a molar mass of 92.02 grams/mole and a percent composition of 30.4% N and 69.6% O is N2O4. The empirical formula is NO2, and since the molar mass of N2O4 matches the given molar mass, N2O4 is the correct molecular formula.
Explanation:
The molecular formula of a compound with a molar mass of 92.02 grams/mole and a percent composition of 30.4% nitrogen (N) and 69.6% oxygen (O) can be determined by first finding the molar amount of each element in one mole of the compound. Using the percent composition and the atomic masses of N (14.01 amu) and O (16.00 amu), we can calculate the moles of each element in one mole of the compound:
For nitrogen: (30.4 g N / 92.02 g compound) × (1 mol N / 14.01 g N) = 0.217 moles of NFor oxygen: (69.6 g O / 92.02 g compound) × (1 mol O / 16.00 g O) = 0.435 moles of OSince the molar amounts of N and O are in a ratio that simplifies nearly to 1:2, the empirical formula of the compound is likely NO₂. To confirm the molecular formula based on the given molar mass, we need to compare the empirical formula mass with the molar mass:
NO₂ has an empirical formula mass of (1 × 14.01 amu) + (2 × 16.00 amu) = 46.01 amu. The molar mass is approximately twice the empirical formula mass, which suggests that the molecular formula is (NO₂)₂ which is N₂O₄, option A. Therefore, the correct molecular formula is N₂O₄.
Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N2 (g) → 2Li3N (s) In a particular experiment, 4.00-g samples of each reagent are reacted. The theoretical yield of lithium nitride is ________ g.
Answer: 6.71 g
Explanation: [tex]6Li(s)+N_2(g)\rightarrow 2Li_3N[/tex]
[tex]{\text{no of moles}}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
[tex]{\text {moles of lithium}}=\frac{4g}{6.914g/mol}=0.578moles[/tex]
[tex]\text{moles of nitrogen}=\frac{4g}{28g/mol}=0.143moles[/tex]
Limiting reagent is the reagent which limits the formation of product. Excess reagent is one which is in excess and thus remains unreacted.
Thus lithium is the limiting reagent and nitrogen is the excess reagent.
As can be seen from the balanced chemical equation, 6 moles of lithium reacts with 1 mole of nitrogen to give 2 moles of lithium nitride.
Thus 0.578 moles of lithium react with 0.096 moles of nitrogen.
6 moles of lithium give = 2 moles of lithium nitride
Thus 0.578 moles of lithium give=[tex]\frac{2}{6}\times {0.578}=0.19moles[/tex] of lithium nitride.
Mass of lithium nitride [tex]Li_3N={\text {no of moles}}\times {\text {Molecular mass}}[/tex]
Mass of lithium nitride[tex]Li_3N[/tex]=[tex]{0.192moles}\times {34.83g/mol}=6.71g[/tex]
Answer: 4.02
Explanation:
-- 4.00 g Li x 1 mol Li x 2 mol LiN x 20.948 g LiN = 4.02 g LiN
-------------- ---------------- ---------------------
6.941 g Li 6 mol Li 1 mol LiN
-- 4.00 g N2 x 1 mol N2 x 2 mol LiN x 20.948 g LiN = 5.98 g LiN
-------------- ---------------- ---------------------
28.014 g N2 1 mol N2 1 mol LiN
A participant took 5.2 hours to complete a marathon. How many minutes did the participant take to complete the marathon? Use 1 hour = 60 minutes 11.5 minutes 33.8 minutes 312 minutes 322 minutes
Answer:
Option C. 312 minutes
Explanation:
A participant took 5.2 hours to complete a marathon.
5.2 hours = 5 hours 12 minutes
In this question we have to convert hours and minutes into minutes.
1 hour = 60 minutes
5.2 hours = 60 × 5.2 = 312 minutes
Participant took 312 minutes to complete the marathon.
The answer to (3.540)x(0.0065)x(401) should have ____.
A.four decimal places
B. Two significant figures
C. Four significant figures
D. Two decimal places
Final answer:
The result of the multiplication should have two significant figures since the number with the least number of significant figures involved in the calculation is 0.0065, which has two significant figures. option B
Explanation:
The question is asking how many decimal places or significant figures the result of the multiplication (3.540) × (0.0065) × (401) should have. According to the rules of significant figures, the answer should have the same number of significant figures as the measurement with the fewest significant figures.
In this case, that is the number with two significant figures, which is 0.0065. Therefore, the final answer should also have two significant figures.
Additionally, it's noted that the number 0.0065 would be expressed as 6.5 × [tex]10^{-3}[/tex] in scientific notation, which confirms it has two significant figures. It is important to calculate it completely to generate an accurate answer with proper significant figures.
How many molecules of carbon monoxide are in 10 mL at STP
The number of carbon monoxide that are in 10 ml at STP is 2.68 x 10²⁰ molecules
calculation
Step 1 : convert 10 ml to L
convert 10 ml to L = 10/1000 =0.01 L
Step 2: find the moles of CO at STP
That is at STP 1 mole = 22.4 L
?moles = 0.01 L
by cross multiplication
= {0.01 L x 1 mole)/22.4 L} =4.46 x 10⁻⁴ moles
Step 3 ; find the number of molecules of Co using the Avogadro's law constant
that according to Avogadro's law 1 moles = 6.02 x 10²³
4.46 x 10⁻⁴ moles =? molecules
by cross multiplication
= {(4.46 x 10⁻⁴ moles) x( 6.02 x 10²³ molecules) / 1 mole} =2.68 x 10²⁰ molecules
I need help with balancing equations I'm doing homework and idk what to do here can you give me the answers please lol
It's pretty easy to balance equations! Basically you want to make sure that the number of each compound is equal on both sides of the arrow.
For example number one is
Fe + H2SO4 -> Fe2(SO4)3 + H2
A 3 in front of H2SO4 because there's a subscript of 3 on the right side.
Then a 3 in front of H2 because of the previous step.
Then add a 2 in front of Fe because of the 2 subscript in Fe2(SO4)3
Then add a 1 in front of Fe2(SO4)3 because you already have an equal number of each element.
2Fe + 3H2SO4 -> 1Fe2(SO4)3 + 3H2
I hope this explanation helps! You should really do your homework because practice is everything when it comes to chemistry. You'll need to know how to do it for exams.
what is the nucleus of atom made of
The answer is:
The nucleus of atom is made of protons and neutrons.
Hope it helps!
the answer is protons and neutrons. :)
Assign oxidation numbers to each element in this compound. NO
Answer:
NO ---> N +2 and O -2
Explanation:
Oxidation numbers are assigned to the elements of a compound to keep a track of the number of electrons each atom has.
Here we have a compound NO (Nitrogen Oxide). The Nitrogen is assigned an oxidation number of +2 while Oxygen in this compound is assigned an oxidation number of -2.
So the algebraic sum of the oxidation numbers of the elements in the compound NO is equal to zero.
Answer:
+2, -2
Explanation:
As per the rule of assigning oxidation number, the oxidation number of O atom is -2. The sum of the oxidation number of a neutral compound is zero. Let us assume x to be the oxidation number of N.
x + (-2) = 0
x – 2 = 0
x = +2
Therefore the oxidation of N in NO is +2 and and the oxidation of O in NO is -2 respectively.
Identify, and briefly explain, two key elements needed for fossilization. must be 3 sentences.
For a fossil to form, several conditions have to be met. First of all, the animal had to live in the given area! Animals live in many environments on Earth, but not everywhere. The water above many lake bottoms and many areas of the deep ocean bottom are stagnant. The bottom water is never exchanged with surface waters, so the water contains no dissolved oxygen. Animals cannot live without oxygen, so no animals live there. In these situations, the only possibility of fossilization is if a fish or other swimming animal dies in oxygen-rich waters above, sinks down into the stagnant muddy bottom, and is buried by sediments.
Answer:
In order for fossilization to occur, the following conditions are required: Hardbody parts (bones, teeth, shells) – soft body parts will not fossilize but may leave behind trace evidence.
Preservation of remains (protection against scavenging, erosion, and environmental damage)
Which type of eye wash station must be checked and flushed most often
stand up eye wash station
Answer:
The answer is: When a foreign substance, usually irritating, penetrates the eyes, and for people with sensitive eyes.
Explanation:
An eyewash liquid, or eyewash liquid system is a liquid, usually a saline solution, used as an emergency or safety mechanism in laboratories and industrial plants as an aid to eye rinsing, s when a foreign substance, usually irritating, penetrates in them.
These eye drops can be beneficial for people with sensitive eyes and can provide relief from the side effects of painful sensation.
The answer is: When a foreign substance, usually irritating, penetrates the eyes, and for people with sensitive eyes.
pls help me with this
The answer is detached earlobes so it's
D) AA
Demand decreases and competition increases are factors that cause a shift in the quantity supplied (true or false)
Answer is: true.
Demand decreases and competition increases decrease the quantity supplied.
Quantity supplied is the quantity of a commodity that producers are willing to sell at a particular price at a particular point of time.
Quantity demanded is the quantity of a commodity that people are willing to buy at a particular price at a particular point of time.
Quantity demanded can change at the same price depending upon factors like recession, changes in the taste of the consumer.
Competition is rivalry between two or more economic groups.
Some characteristics of each of the four states of matter are given in the table below.
States of Matter
State Are Particles Charged? Space Between Particles
1 No Very Low
2 Yes High
3 No High
4 No Low
Which state of matter does State 4 represent?
A. Gas
B. Liquid
C. Plasma
D. Solid
Matter can be classified into four states:
1) Solid: This state is composed of uncharged particles that are held together very closely in a regular arrangement by strong intermolecular forces of attraction.
2) Liquid: Like solids, this state is also composed of uncharged particles. However, compared to the solids these lie farther apart and are held by relatively weaker forces
3) Gas: In this state, the interacting particles are uncharged and have a lot of space between them to move freely.
4) Plasma: This is the fourth state of matter composed of highly charged particles which are far apart from each other and possess high kinetic energies.
Based on the given characteristics:
In State 4 the particles are uncharged with a relatively low separation between them. This corresponds to the liquid state.
Ans: B
It's a Liquid! Sorry if it's too late!
A bob of mass of 0.18 kilograms is released from a height of 45 meters above the ground level. What is the balue of the kinetic energy gained by the bob at the ground level?
Final answer:
The kinetic energy of a bob released from a height can be calculated using its initial gravitational potential energy, which converts to kinetic energy as it falls. Assuming no energy is lost, the kinetic energy at ground level equals the initial potential energy calculated with the mass, acceleration due to gravity, and the height from which it was released.
Explanation:
The question involves calculating the kinetic energy gained by a bob as it falls to the ground from a certain height. To determine the kinetic energy of the bob at ground level, we can start by calculating its potential energy at the initial height using the formula gravitational potential energy (GPE) = m × g × h, where m is the mass of the bob, g is the acceleration due to gravity, and h is the height above ground. Assuming that no energy is lost to air resistance or other forms of dissipation, the potential energy will convert entirely to kinetic energy as the bob falls.
For a bob with a mass of 0.18 kilograms released from a height of 45 meters, the initial gravitational potential energy (GPE) would be 0.18 kg × 9.8 m/s² × 45 m. At the ground level, all this potential energy would have been converted to kinetic energy, because the height is now zero and hence the potential energy is zero.
The formula for kinetic energy is KE = ½ × m × v², where v is the velocity at the ground level. But since we do not need to calculate velocity here, we can simply state that the kinetic energy at ground level equals the initial potential energy due to the principle of conservation of energy. So the kinetic energy of the bob at ground level would be the same as the initial potential energy, which can be calculated using the GPE formula provided above.
as levels of carbon dioxide increase in the atmosphere, we could expect oceanic carbon dioxide levels to _____ and oceanic pH to _____ .
Answer:
increase; decrease
Step-by-step explanation:
The oceans absorb 25 % to 30 % of CO₂ emissions quickly and about 85 % in the long term.
Thus, carbon dioxide levels in the ocean increase.
=====
Dissolved CO₂ is involved in several equilibria.
(1) CO₂(g) ⇌ CO₂(aq)
(2) CO₂(aq) + H₂O(ℓ) ⇌ H₂CO₃(aq)
(3) H₂CO₃(aq) + H₂O(ℓ) ⇌ HCO₃⁻(aq) + H₃O⁺(aq)
(4) HCO₃⁻(aq) + H₂O(ℓ) ⇌ CO₃²⁻(aq) + H₃O⁺(ℓ)
Reaction(3) accounts for most of the increase in hydronium ion concentration.
pH = -log[H₃O⁺]
As [H₃O⁺] increases, pH decreases.
Sea surface pH has decreased from 8.25 to 8.07 since the Industrial Revolution. This corresponds to a 50% increase in hydronium ions in the oceans.
We can see these effects in the NOAA graph below.
As atmospheric CO₂ levels rise, oceanic CO₂ also increases, leading to a decrease in oceanic pH, a process termed ocean acidification. This results in a reduction in carbonate ions, making it more difficult for marine life to produce hard exoskeletons and shells, especially for organisms such as corals and shellfish.
As levels of carbon dioxide (CO₂) increase in the atmosphere, we can expect oceanic carbon dioxide levels to increase and oceanic pH to decrease. This process, known as ocean acidification, leads to a significant reduction in the availability of carbonate ions, which are critical for marine organisms such as shellfish and corals to produce their hard exoskeletons and shells.
As a result, these organisms have to expend more energy to maintain their structures and are at higher risk of dissolution and weakening under the more acidic conditions.
The increase in ocean acidity poses serious threats to marine ecosystems and can hinder the growth and structural integrity of organisms that rely on calcium carbonate. With increased acidity by about 25% since the pre-industrial era, the ability of these organisms to produce calcium carbonate is diminished.
Moreover, if atmospheric CO₂ concentrations continue to rise, the situation may worsen, leading to further decreases in ocean pH and potentially causing corals to become rare by 2050 due to reduced calcification rates.