Photosynthesis is a chemical change as:
A. New substances are formed with properties that are different from the original substances.
What is a Chemical Change?A chemical change happens when one chemical substance is transformed into one or more different substances. A chemical change is different from a physical change, which doesn't rearrange atoms or molecules and produce a completely new substance.
Thus, correct option is A which proves that photosynthesis is a chemical change.
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What does adding a catalyst to a reaction do?
Select all that apply.
increase the amount of each product formed by the reaction
lower the activation energy of the reaction (correct)
alter the orientation of reactants in the reaction
increase the rate of the reaction (correct)
yes both B and D are correct
Catalysts lower the activation energy of the reaction therefore, the rate of reaction will increase. Therefore, option B, D are correct.
What is a catalyst?Catalysis can be defined as the process of enhancing the rate of a reaction by adding a substance or chemical compound known as a catalyst. Catalysts are usually not consumed in the chemical reaction and can be recovered unchanged after the completion of the reaction.
The catalyst can be recycled quickly, and little amounts of catalysts are sufficient for mixing, temperature, and surface area are factors in the reaction rate. The catalyst reacts with one or more reactants to generate intermediates that provide the final product.
The addition of a catalyst can lower the activation energy of reactant molcules, therefore, increasing the rate of the reaction. Because catalysts increase in frequency the successful collision as more reactant molecules have activation energy.
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What is an atomic number ?
Explanation:
the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table
Write an ionic equation for the reaction of zinc and dilute hydrochloric acid, include state symbols.
Explanation:
When zinc reacts with dilute hydrochloric acid, it is a metal-acid reaction to produce zinc chloride and hydrogen gas.
Zn (s) + 2HCl (aq) => ZnCl2 (aq) + H2 (g)
Ionic equation:
Zn2+ (aq) + 2Cl- (aq) => ZnCl2 (aq)
Which mineral is used in batteries
Batteries come in all shapes and sizes, and depending on the type of battery, the minerals that compose them are mainly lithium, cobalt, graphite, nickel and manganese.
A solution has a pOH of 12. Which best describes the solution?
Answer:
The solution is acidic.
Explanation:
The nature of solution will be acidic.
What is solution?A solution is just a uniformly dispersed mixture of more than solutes in a solvent.
What is acidic?In nature, chemical species with a pH value between. are termed acidic. Acidic substances have a sour flavor in general. In the beginning, acid was defined as a sour substance that interacts with metal as well as turns blue litmus red.
Calculation of pH.
Given data:
pOH = 12
The nature of the solution can be calculated by pH formula.
pH+ pOH = 14
Put the value of pOH in above expression.
pH = 14-pOH
pH = 14-12
pH = 2.
Hence, the nature of the solution will be acidic.
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Describe the general
trends for ionic radius.
The group of the periodic table determines the ___.
Answer: C. Number of valence electrons
Explanation: A group is a vertical column in the periodic table, which signifies the number of valence shell electrons in an element's atom. Example: all the elements in group 1 have 1 electron in their outer most shell.
in the group the reactivity of metals increases? give example
Answer:
As sodium and potassium both are alkali metals that belong to Group IA of the periodic table. They have one valence electron in their valence shell. As we move from top to bottom, the reactivity of metallic elements of Group IA increases.
If earths glaciers were to melt what would be the most likely effect in florida
Answer:
Well if glaciers were to most likley melt wit would have a big affect on the world. But on Florida the affect would be as everybody would expect, a flash flood, with high water's and everything under water. AND there would most lilkley be something in the glacier. Not highly sure about it though
Explanation:
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What is the theoretical yield, in grams, and the percent yield of a reaction of 3.0 moles of two hydrogen atoms and 2.0 moles of Iodine atoms to produce one mole of Hydrogen Iodine.
Answer:
512g, 25%
Explanation:
H_2+I_2→ 2HI
3 moles H_2× 2moles HI/1 mole of H_2= 6 moles of HI
2moles I_2×2 moles of HI/1 mole of I_2= 4 moles of HI
Now, theoretical yield of HI = 4 moles ×128 g/ mole = 512 g
percentage yield = (128g/512g)×100 = 25%
1.) Silver (Ag) has 47 protons, 60 neutrons, and 47 electrons in each atom. Based on this information,
what is the mass number?
Answer:
Explanation:
47 i took the test
Silver (Ag) has 47 protons, 60 neutrons, and 47 electrons in each atom. Based on this information, the mass number of the silver would be 107.
What is the atomic number?The total number of protons present in an atom is known as the atomic number of that atom. The atomic number has no correlation either with the number of neutrons or the number of electrons present inside an atom.
As given in the problem Silver (Ag) has 47 protons, 60 neutrons, and 47 electrons in each atom.
The atomic number of the silver = number of protons
= 47
The mass number of the silver = number of protons + number of neutrons
=47 + 60
=107
Thus, based on the given information the mass number of the silver would be 107.
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All of the elements in the actinide family are ?
(liquids/radioactive).
Answer:
Radioactive
Explanation:
:D
Answer:
c-Radioactive
Explanation:
What is the balanced equation for the reaction of a solution of sodium sulfate is mixed with strontium chloride?
Select one:
a.Na2SO4(aq) + SrCl2(aq) = 2 NaCl(aq) + SrSO4(s)
b.Na2SO4(aq) + SrCl2(aq) = NaCl(s) + SrSO4(aq)
c.NaSO4(aq) + SrCl(aq) = NaCl(aq) + SrSO4(aq)
d.NaSO4(aq) + SrCl(aq) = NaCl(aq) + Sr2SO4(aq)
Answer:A
Explanation: reactants: Na2SO4 and SrCl2
Products: NaCl and SrSO4
1. A gas at 24.0 Celsius and.900 atm fills a 0.95 Liter container.
What is its ending pressure (in atm) if the temperature changes
to 75 Celsius? Show all your work.
Answer:
P₂ = 1.05 atm
Explanation:
Given data:
Initial temperature = 24.0 °C (24+273 = 297 K)
Initial pressure = 0.900 atm
Final pressure = ?
Final temperature = 75 °C (75 + 273 =348 K)
Volume = constant
Solution:
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
0.900 atm / 297 K = P₂/348 K
P₂ = 0.900 atm × 348 K / 297 K
P₂ = 313.2 atm. K /297 K
P₂ = 1.05 atm
3. (04.02 MC) Which component is missing from the process of photosynthesis? Carbon Dioxide + Water + ________ Glucose + Oxygen
Sunlight
Sugar
Plants
Carbon
Answer:
Sunlight
Explanation:
Sunlight is always neccesary in photosynthesis
Answer:
Carbon Dioxide + Water + Sunlight → Glucose + Oxygen.
Explanation:
5. What is the molar mass of ethanol (C2H5OH)?
A) 45.06 g/mol
C) 30.03 g/mol
B) 34.06 g/mol
D) 46.07 g/mol
The molar mass is given by the sum of the atomic masses of the component elements of the substance.
In our case, the substance is ethanol or C₂H₅OH.
[tex]A_C=12.011 [/tex]
[tex] A_H=1.0079 [/tex]
[tex] A_O=15.9994[/tex]
[tex]\mathcal M_{C_2H_5OH} = 2 \times A_C + 6 \times A_H + A_O = 2 \times 12.011 + 6 \times 1.00079+ 15.999 4= 24.022 + 6.0474 + 15.9994= 46.069≈ \boxed{46.07 \dfrac{g}{mol}}[/tex]
In pea plants the trait for green sea pods ( G) is dominant over the trait for yellow seed pods (g) which cross will produce the maximum number of offspring with green sea pods?
Answer:
See the answer below
Explanation:
The cross that would produce the maximum number of offspring with green sea pods would be:
1. GG x GG, or
2. GG x gg
The first one would produce all green offspring with homzygous genotypes as follows:
GG x GG
GG GG GG GG
The second cross would produce all green offspring with heterozygous genotypes as follows:
GG x gg
Gg Gg Gg Gg
Balance this chemical equation
During the formation of the compound sodium chloride, the correct symbol and charge for each of the ions must be...
O Na+1 and Cl-1
O Na+1 and F-1
O Na+1 and Br-1
O Na+1 and O-2
Answer : The correct symbol and charge for each of the ions must be [tex]Na^{+1}[/tex] and [tex]Cl^{-1}[/tex].
Explanation :
Covalent compound : It is defined as the compound which is formed by the sharing of electrons between the atoms forming a compound.The covalent compound are usually formed when two non-metals react.
Ionic compound : It is defined as the compound which is formed when electron gets transferred from one atom to another atom.Ionic compound are usually formed when a metal reacts with a non-metal.
As we know that the sodium chloride is an ionic compound in which sodium is an alkali metal and has one valence electron and chlorine is a non-metal and has 7 valence electrons.
When sodium atom donates an electron to a chlorine atom then it forms an ionic compound that is sodium chloride (NaCl) and the resulting positive ion [tex]Na^{+1}[/tex] and negative ion [tex]Cl^{-1}[/tex] form a stable ionic compound.
Hence, the correct symbol and charge for each of the ions must be [tex]Na^{+1}[/tex] and [tex]Cl^{-1}[/tex].
A bottle of H3PO4 contains 30.00 g, how many moles are in this container?
Moles in the container : 0.306
Further explanationGiven
30 g of H3PO4
Required
moles in container
Solution
A mole is a unit of many particles (atoms, molecules, ions) where 1 mole is the number of particles contained in a substance that is the same amount as many atoms in 12 gr C-12
1 mole = 6.02.10²³ particles
While the number of moles can also be obtained by dividing the mass (in grams) with the molar mass of element or molecule
MW of H3PO4 = 3.1 + 31 + 4.16 = 98 g/mol
mol = mass : MW
mol = 30 : 98
mol = 0.306
Name the following compound with a polyatomic ion: Na₂SO₄ *
Answer:
sodium sulfate
Explanation:
For naming an ionic compound with polyatomic anion, the metal is written first using its element name followed by name of the polyatomic anion. Therefore, the compound with Na+Na+ cation and SO2−4SO42− anion is named as sodium sulfate.
Humans are most abundant during which geological era?
Cenozoic
Precambrian
Palcozoic
Mesozoic
Answer:
Cenoizic
Precamborian
Which of the following might be included in a chemical
reaction?
a) Molecules
b) lons
c) Pure elements
d) All of the above
Answer:
I think it's D
Explanation:
What function does a cell wall serve for a plant?
It provides the plant cell with structure and support, along with protection from bursting due to turgor pressure
Explanation:
Which element, when combined with fluorine, would most likely form an ionic compound
What forces typically hold nonmetal atoms together within a molecule?
A. Metallic bonds
B. Covalent bonds
C lonic attractions
D Intermolecular forces
Answer:
B - Covalent bonds
Explanation:
Covalent bonds are a class of chemical bonds where valence electrons are shared between two atoms, typically two nonmetals. The formation of a covalent bond allows the nonmetals to obey the octet rule and thus become more stable.
Substance X is a compound containing 632mg of manganese and 368mg of oxygen. Substance X is shown
below. Manganese has a relative atomic mass of 55 and oxygen has a relative atomic mass of 16. What is the
value of y in the formula below?
The empirical formula : MnO₂.
Further explanationGiven
632mg of manganese(Mn) = 0.632 g
368mg of oxygen(O) = 0.368 g
M Mn = 55
M O = 16
Required
The empirical formula
Solution
You didn't include the pictures, but the steps for finding the empirical formula are generally the same
Find mol(mass : atomic mass)Mn : 0.632 : 55 = 0.0115
O : 0.368 : 16 =0.023
Divide by the smallest mol(Mn=0.0115)Mn : O =
[tex]\tt \dfrac{0.0115}{0.0115}\div \dfrac{0.023}{0.0115}=1\div 2[/tex]
The empirical formula : MnO₂
I will not be cooking ever again
Lm/aooooo was that supposed to be a quesadilla?
Answer:
why it just a mistake everyone make a mistake i belive in you.
Explanation:
The breakdown of proteins produces:
A. Carbon Dioxide
B. Urea
C. Water
D. Glucose
Answer:
Glucose
Explanation:
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what is the first thought when u hear the word mole?
The word mole is one of those crazy words that have multiple meanings that can sometimes lead to confusion. Perhaps your first thought after hearing the word is a cute little animal that burrows in the ground.
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