We know the sun is primarily made from hydrogen and helium on the basis of its spectrum.
What is Sun's spectrum?Sun's spectrum refers to the light of the Sun whose wavelength spectra can be used to identify atomic composition.
Thus spectrum (Sun's spectrum) initiates with the red light (700 nm) and ends with the blue (380 nm).
In conclusion, we know the sun is primarily made from hydrogen and helium on the basis of its spectrum.
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In a process called photosynthesis, plants use carbon dioxide and water, along with energy from sunlight, to produce sugar and oxygen. photosynthesis is represented by the equation what must a plant need to produce 4 molecules of sugar? 6 molecules of co2 6 molecules of h2o 18 molecules of co2 24 molecules of h2o
24 molecules of H2O are needed by the plant to produce 4 molecules of sugar.
What is photosynthesis?The process by which plants convert carbon dioxide, water, and sunlight into oxygen and sugar-based energy is known as photosynthesis.
The photosynthesis equation is as follows:6CO2 + 6H2O + Sunlight → C6H12O6 + 6O2
The following three significant activities are involved in photosynthesis:
1. Chlorophyll absorbs light energy.
2. Water molecules are divided into hydrogen and oxygen and light energy is converted to chemical energy.
3. Carbon dioxide is converted to sugars.
Therefore, a plant needs four molecules of H2O and four molecules of CO2 to make one molecule of glucose or sugar, hence a plant needs 24 molecules of H2O and 24 molecules of CO2 to make four molecules of sugar.
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Answer:
D) 24 molecules of H2O
Explanation:
Just did the test on Edge 2023 and got it right. Have a nice day :)
From 200 mg of CO₂, 1021 molecules are removed. How many molecules of CO₂ are left?
Answer:
CO_(2)` molecules removed `= 10^(21)` <br> No. of `CO_(2)` molecules left `= 2.74 xx 10^(21) - 10^(21) = 1.74 xx10^(21)` <br>
Explanation:
What mass of sodium chloride (nacl) forms when 7.5 g of sodium carbonate (na2co3) reacts with a dilute solution of hydrochloric acid (hcl)? type in your answer using the correct number of significant figures. na2co3 2 hcl → 2nacl h2o co2 7.5 g na2co3 = g nacl
Answer:
8.3 g of NaCl
Explanation:
Edge 2022
Answer:
8.3 g NaCl
Explanation:
Its right just type it in
The temperature of a thermometer
increases during a chemical reaction.What happens to the energy of the reaction (system)?
A. The reaction releases energy (- or exothermic).
B. The reaction absorbs energy (+ or endothermic).
C. The reaction does not cause an energy change.
Answer:
B. the reaction absorbs energy (+ or endothermiic)
It requires 2,500 joules to raise a certain amount of water (c = 4.186 j/g°c) from 20.0°c to 60.0°c. what is the mass of the water that is being heated? 15 g 40 g 63 g 80 g
Answer:
15 grams of water will absorb 2,500 Joules in going from 20.0 to 60.0 C.
Explanation:
The heat involved in raising a mass (m) of a substance with a specific heat (c) from one temperature to another (Delta T) is given by:
Heat = mc(Delta T)
2,500 Joules = m*(4.186J/gC)*(60C-20C)
2,500 Joules = m*(4.186J/gC)*(40C)
2,500 Joules = m*(4.186J/gC)*(40C)
m = (2,500J)/(4.186*40J/g)
m = 14.93 grams
Answer: B (15g)
Explanation:
What does the author predict about the future of the Earth's mantle? Do you support his educated guess? Use complete sentences to answer.
The earth's mantle will not change in the future because this region is safe from the intervention of human beings.
What happens in the Earth's mantle?The transfer of heat and material in the mantle helps us to determine the landscape of Earth. Activity in the mantle moves the plate tectonics, that contributes to volcanoes, seafloor spreading, earthquakes, and building of mountains.
So we can conclude that the earth's mantle will not change in the future because this region is safe from the intervention of human beings.
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Describe the properties of noble gases. based on their electronic arrangement, explain whether they can exist alone in nature.
Noble gases exist as monatomic gases, which means that their molecules consist of a single atom.
What are noble gases?A "Noble gas" can be defined as a gas which does not undergo chemical reactions. Examples of Noble gases are helium, Neon, Argon, Krypton, Xenon, and Radon.
Properties of noble gases:
Noble gases are the least reactive of all elements because they have eight valence electrons, which fill their outer energy level. That's why noble gases rarely react with other elements and form compounds.
Atoms of noble gases do not bond with other gases. Only helium exists as atoms of Helium, not as diatomic molecules. Helium does not form compounds with atoms of other elements.
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How many grams of carbon are contained in one mole of[tex]C_{3}H_{8}[/tex] ?
[tex]\quad \huge \quad \quad \boxed{ \tt \:Answer }[/tex]
[tex]\qquad \tt \rightarrow \:36 \:\: g [/tex]
____________________________________
[tex] \large \tt Explanation \: : [/tex]
The given compound has 3 carbon atoms, so in 1 mole of that compound, there will be 3 moles of carbon atoms.
Mass of each mole of carbon atoms = 12 g
For 3 mole carbon atoms, it will be 12 × 3 = 36 grams
Answered by : ❝ AǫᴜᴀWɪᴢ ❞
Which feature of a balanced chemical equation demonstrates the law of
conservation of mass?
A. It shows the products of a chemical reaction to the right of the
reaction arrow.
OB. It shows the reactants of a chemical reaction to the left of the
reaction arrow.
C. It has the same types of atoms on both sides of the reaction
arrow.
O
D. It has coefficients to show how much of each substance a
chemical reaction uses.
Answer:
C. It has the same types of atoms on both sides of the reaction arrow.
What is a chemical equation?A chemical equation is a symbolic representation of a chemical reaction; Reactants are represented on the left and the products on the right.
The law of conservation of mass states that in a closed system, mass is neither created nor destroyed during a chemical or physical reaction. The law of conservation of mass is applied whenever you balance a chemical equation. It is also applicable to stoichiometry. A balanced equation demonstrates the conservation of mass by having the same number of each type of atom on both sides of the arrow.
Consider the balanced equation for the combustion of methane.
[tex]CH_4 + 20_2 \implies CO_2 + 2H_2O[/tex]
All balanced chemical equations must have the same number of each type of atom on both sides of the arrow.
In this equation, we have 1 C atom, 4 H atoms, and 4 O atoms on each side of the arrow.
The number of atoms does not change, so the total mass of all the atoms is the same before and after the reaction. Mass is conserved.
The same atoms of the same element that are present in the reactants are also present in the products, according to the rule of conservation of matter.
This leads us to believe that the response to the question is true because: It has the same atom kinds on both sides of the reaction arrow (Option C)
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Which of the following choices is NOT a consequence of incomplete combustion?
A. Carbon monoxide blocking oxygen in the blood.
B. Heavy metals leaking into groundwater and damaging the nervous system.
C. Carbon particles causing breathing problems.
D. Carbon particles making buildings dirty.
Carbon monoxide blocks oxygen in the blood. Hence, option A is correct.
What is combustion?Combustion is a chemical process or a reaction between Fuel (Hydrocarbon) and Oxygen.
During incomplete combustion part of the carbon is not completely oxidized producing carbon monoxide (CO). Incomplete combustion uses fuel inefficiently and carbon monoxide is released.
Carbon monoxide gas diffuses rapidly across the pulmonary capillary membrane, binding to haemoglobin with an affinity 200 times that of oxygen to form carboxyhemoglobin. By displacing oxygen, CO decreases the oxygen-carrying capacity and oxygen delivery to tissues, causing marked cellular hypoxia and acidosis.
Hence, option A is correct.
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A volumetric pipette has one marked line that indicates a specific volume. Considering polar substances dip downward in a glass volumetric pippette creating a concave meniscus, what is the correct way to read a volumetric pipette to have the most accurate measurement?.
The best way to make an accurate measurement of the height of a polar liquid is to take the reading from the lowest point of the meniscus.
What is the meniscus of a liquid?The meniscus of a liquid is a curved that occurs at the top of a liquid placed in a container as a result of the attractive forces between the molecules of a the liquid.
Polar substances such as water have a concave meniscus as they dip downwards.
Therefore, the best way to make an accurate measurement of the height of a polar liquid is to take the reading from the lowest point of the meniscus.
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10.5 mL of an unknown solution are diluted to 80.0 mL. The concentration of the
new solution was determined to be 0.172 M. What was the molarity of the
unknown solution? (Report your answer to two places past the decimal point.
Moodle is looking for a number only, no units.)
The molarity of the unknown solution will be 1.310 M.It is denoted by M₂.
What is molarity?Molarity is defined as the ratio of the moles to the volume of the solution.
Given data;
Volume of unknown solution,V₁ = 10.5 mL
The volume of diluted solution,V₂ = 80.0 mL
Molarity of new solution,M₁ = 0.172 M
Molarity of unknown solution, M₂=?
For dilution we use the formula as;
M₁V₁=M₂V₂
M₂=M₂V₂/V₁
M₂ = ( 80 × 0.172 ) / 10.5
M₂= 1.310 M
Hence the molarity of the unknown solution will be 1.310 M.
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heating up a reaction increases the speed of a reaction until the ____
Heating up a reaction increases the speed of a reaction until the enzyme denatures.
What is enzyme denaturation?Enzyme denaturation occurs when a biological protein catalyst does not work anymore due to a high temperature that alters its tridimensional conformation.
This cellular process (denaturation) is well known to be one of the main causes of enzymatic failure.
In conclusion, heating up a reaction increases the speed of a reaction until the enzyme denatures.
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a serving of a particular fruit dessert contains 20.0 g of sugar. if all the sugar is sucrose, c12h22o11, how many molecules of sugar are present in this serving?
Taking into account the definition of Avogadro's number and molar mass, 3.49334×10²² molecules of sucrose are present.
Definition of molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Avogadro's NumberAvogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Molecules of sugar in this caseIn first place, the molar mass of sucrose is 342 g/mole. So, you can apply the following rule of three: If by definition of molar mass 342 grams of the compound are contained in 1 mole, 20 grams of the compound are contained in how many moles?
[tex]amount of moles=\frac{20 gramsx1 mole}{342 grams}[/tex]
amount of moles= 0.058 moles
Now, considering the Avogadro's number, you can apply the following rule of three: If 1 mole of the compound contains 6.023×10²³ molecules, 0.058 moles contains how many molecules?
amount of moleculas= (6.023×10²³ molecules × 0.058 moles)÷ 1 mole
amount of molecules= 3.49334×10²² molecules
Finally, 3.49334×10²² molecules of sucrose are present.
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lithium
potassium.
calcium
sodium
magnesium
aluminum.
zinc
iron
nickel
lead
hydrogen
copper
mercury
silver
gold
An unknown metal displaces aluminum (Al) from solution but does not displace sodium (Na). Using the activity series, determine the unknown
metal.
OA. Calcium (ca)
OB. zinc (Zn)
OC. manganese (Mn)
OD. magnesium (Mg)
increasing activity
calcium (Ca)
Answer:
The unknown metal could be calcium or magnesium.
Explanation:
Displacement of a metal from its chemical reaction is shown by the reaction known as single displacement reaction. The reactivity of metal is determined by the reactivity series. The metals lying above in the series are more reactive than the metals which lie below in the reactivity series.
Metal B is more reactive than metal A.
The metal which easily displaced aluminium will lie above in the series but that same element cannot displace sodium, so it will lie below in the series.
Hence, from the series, we conclude that the unknown metal could be calcium or magnesium.
Pls someone smart complete the matching
Brainliest to first decent answer
What is the chemical formula for the molecule represented by the model?
CHO
C4H9O2
C4H8O
C3H8O2
The correct formula of the molecule is C4H9O2.
What is a model?The model of a compound is a representation of the molecule. It gives us an idea of what the molecule looks like as well as its molecular formula.
Looking at the structure of the compound as shown in the model in the question, the correct formula of the molecule is C4H9O2.
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Answer:C4H9O2.
Explanation:
Which shows a monosaccharide?
Monosaccharides are the group of carbohydrates that are the simplest form of sugar. Option A galactose is a monosaccharide sugar.
What are monosachharides?Monosaccharides are simple sugars and are the fundamental unit of carbohydrates.
The general structural formula for the monosaccharides is (CH₂O)ₙ
The structure of the monosaccharide sugar contains carbon, oxygen, and hydrogen molecules in their structure.
Galactose that is a simple sugar with six carbon atom rings Hence, option A is a correct option
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All of the following are physical properties except a. density b. colour c. reaction with oxygen d. melting point
Answer:
C
Explanation:
a, b and d are physical properties ..... the compound or element in question has not changed its identity
c when combined with oxygen, it has changed to a different compound via CHEMICAL property.
Use the References to access important values if needed for this question. The Pauli Exclusion Principle tells us that no two electrons in an atom can have the same four quantum numbers. For each of the orbitals below list a set of possible quantum numbers. Give only one value for each Orbital ... n ... ... l ... ... ml ... ... ms ... 1s fill in the blank 4 There are a total of values possible for ml 3s
The quantum numbers are used to describe the position of an electron in atom.
What are quantum numbers?The quantum numbers are used to describe the position of an electron in atom. I have attached a picture that shows the complete question.
For the 1s orbital;
n =1
l = 0
ml = 0
ms = ±1/2
For the 2s orbital;
n = 2
l = 1
ml = -1, 0, 1
ms = ±1/2
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For a particular chemical reaction, the enthalpy of the reactants is -400 kJ. The enthalpy of the products is -390 kJ. The entropy of the reactants is 0.2 kJ/K. The entropy of the products is 0.3 kJ/K. The temperature of the reaction is 25 degrees Celsius. What can you conclude about this reaction
Answer:
For a particular chemical reaction, the enthalpy of the reactants is -400 kJ. The enthalpy of the products is -390 kJ. The entropy of the reactants is 0.2 kJ/K. The entropy of the products is 0.3 kJ/K. The temperature of the reaction is 25oC. What can you conclude about this reaction?
It is exergonic
It is endergonic
it is a redox reaction
It is being catalyzed by an enzyme
How many moles of NO2 form when
63.25 g N2O5 decompose?
2N2O5→ 4NO2 + 0₂
Answer:
1.1713 moles
Explanation:
RFM of N2O5= (14*2)+(16*4)=108
Moles of N2O5= Mass/RFM= 63.25/108= 0.5856 moles
Mole ratio of N2O5:NO2 = 2:4
Therefore moles of NO2= 4/2*0.5856= 1.1713 moles
Saturated fatty acids and unsaturated fatty acids differ in.
Answer:
the number off double bonds in a fatty acid chain
How many grams of aluminum
chloride, AlCl3, form when 0.25 mol
Al react?
2AI+ 3Cl₂ → 2AICI 3
[?] g AICI 3
From the equation, we know that for every 2 moles of aluminum consumed, 2 moles of aluminum chloride are produced.
This means that if 0.25 moles of Al react, then 0.25 moles of aluminum chloride are produced.
The atomic mass of Al is 26.9815385 g/mol.The atomic mass of Cl is 35.45 g/mol.So, the formula mass of aluminum chloride is:
26.9815385+3(35.45)=133.3315385 g/mol.Thus, 0.25 moles have a mass of:
(133.3315385)(0.25), which is about 33 g (to 2 sf)would mean alot to help
Answer:
n
Explanation:
nobody knows
Answer: O
Explanation:
Out of the given elements, oxygen has the highest electronegativity.
An element has two naturally-occurring isotopes. The mass numbers of these isotopes are 115.00 u and 117.00 u, with natural abundances of 25% and 75%, respectively. Calculate its average atomic mass. Report your answer to 2 decimal places.
[tex](115.00)(0.25)+(117.00)(0.75)=\boxed{116.50 \text{ u}}[/tex]
The scientists who have contributed to our current body of knowledge were
from what part of the world?
A. All areas of the world
B. Mostly Europe
C. Mostly the Middle East
D. Only the United States
SEMIT
Answer:
A.
Explanation:
Well, Nicola Tesla was from Croatia.
Albert Einstein was from Germany.
Thomas Edison was from the U.S.
So I think all over.
What is the noble gas configuration for tellurium (Te)?
The Periodic Table
OA. [Kr] 5s²4d105p4
O B. [Kr] 5s25p65d8
O C. [Xe] 5s25065
O D. [Xe] 5s24d1¹05p4
The correct answer to this question is option A.
How are a mole and a dozen similar?
Mole and dozen are similar to each other because of the presence of number 12 in both measurements.
How are a mole and a dozen similar?The sample of 12 grams of carbon is equal to its one mole and we know that in one dozen, there are 12 numbers. Therefore, we considered mole similar to a dozen.
So we can conclude that Mole and dozen are similar to each other because of the presence of number 12 in both measurements.
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Which of the following is NOT an example of combustion occurring?
A. A car engine
B. A rocket lifting off
C. Battery acid burning the floor
D. A bonfire
Answer:
C. Battery acid burning the floor
Explanation:
C. Battery acid burning the floor
in combustion fire is created
Battery acid burning the floor is NOT an example of combustion occurring.
The answer is option C.
What is combustion?Combustion is a chemical process or a reaction between the gas (Hydrocarbon) and Oxygen. while gasoline and oxygen react it releases warmth and light energy. heat and light energy then result in the flame. So, the system for Combustion reaction is Hydrobcarbon + Oxygen = warmness electricity.
Combustion in daily existence examples is: Burning of wooden or Coal for the family functions. Burning of Petrol or Diesel for using vehicles like vehicles. Combustion of herbal gas or LPG.
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