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30 POINTS!
Which parts are only found in plant cells?
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Answer:
A B and F
Explanation:
.................
PLEASE SOLVE THIS QUESTION.
VERY MUCH IMPORTANT
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Answer:
[tex]thank \: you[/tex]
The Coca- cola is diluted and reacted with molybdate/metavanadate reagent before the %T is measured.
a. True
b. False
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Answer:
true
Explanation:
I believe that is the correct answer (if right brainiest plz)
write a short note on importance of air
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The atomic size of atoms ________. A) increases going across a period B) decreases going down within a group C) increases going down within a group D) does not change going down within a group
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Answer: my answer is A) increases going across a period
Explanation: because of it nuclear charge as it increases going across a period
HOPE THIS HELPSSSSS!!
Evolution means..... exchanges gradual development transcription differentiation
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Explanation:
Evolution means Gradual Development. It is a procedure in the gradual development in which species of different animal's, plants etc... leisurely started to change some of their activities or elements and it changes only due to some situations it changes over many generations also.
Answer:
mark me as a brainlist answer i hope it will help you
Explanation:
Evolution means Gradual Development. It is a procedure in the gradual development in which species of different animal's, plants etc... leisurely started to change some of their activities or elements and it changes only due to some situations it changes over many generations also.
the internacional system of units is based on ?
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Answer:
The international system of units is basic on 7 units.
Hope it helps you.AM AWARDING BRAINLIEST :))
Re-order each list of elements in the table below so that the elements are listed in order of decreasing electronegativity
1) Cl, Br, F
2) B, 0, C
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F has the highest electronegativity of all atoms
2) O > C > B
Please help!!! Question 1 to 8
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Answer:
1) C - 30
2) A - MgO
3) C - 3Cu + N2 + 3H2O
4) C - 100
Explanation:
what is the source of energy that is absorbed by the electrons to move from the ground state to excited state?
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Answer:
I think an atom changes from a ground state to an excited state by taking on energy from its surroundings in a process called absorption. The electron absorbs the energy and jumps to a higher energy level. In the reverse process, emission, the electron returns to the ground state by releasing the extra energy it absorbed.
I hope this help you!:)
if 10 moles of A and 7.5 moles of B are taken in a flask, identify the value of moles of A4B3 produced in a reaction.
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The number of moles of A4B3 produced in a reaction is obtained by stoichiometry.
The term stoichiometry refers to mass-mole relationship. The first step in solving this problem is by writing the correct reaction equation as follows;
4A + 3B -------> A4B3
If 4 moles of A yields 1 mole of A4B3
10 moles of A yields 10 * 1/4 = 2.5 moles of A4B3
Therefore, 2.5 moles of A4B3 is produced.
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a transistor has beta=180 calculate the approximate collector and base currents if the emitter current is 10ma
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Answer:
kausvsnks
Explanation:
bdjwkagsjwlak
Write the chemical symbols for three different atoms or atomic cations with 11 electrons.
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Three ways to represent atoms or atomic cations with 11 electrons include :
[tex] {Mg}^{ + } \: {Al}^{2 + } \: {Si}^{3 + } [/tex]
Mg = magnesium has 12 electrons in its neutral state, when it loses one electron to attain stability, it's election becomes 11.
Al = Aluminum has 13 electrons in its neutral state, when it donates 2 electron to attain stability, it becomes (13 - 2). = 11
Si = Silicon has 14 electrons on it's neutral state, when it loses 3 electrons to attain stability, we have (14 - 3) = 11
Hence,
[tex]{Mg}^{ + } \: {Al}^{2 + } \: {Si}^{3 + } [/tex]
are atomic cations with 11 electrons.
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0.5 mole of Na2SO4 x 10 H2O consists of what
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Answer:
» It contains two atoms of sodium sulphate
» It contains 10 molecules of water.
The mass of all the water on earth is 1.4 x 1024 grams. How do you think
someone was able to measure that number?
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halogens can react with metals by accepting a/an____ from a metal atom and forming an ionic compound
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How does the volume occupied by a cubic centimeter (cm3) compare with the volume occupied by a milliliter
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Answer:
One cubic centimeter is equal to one milliliter. Cubic centimeter is used interchangeably with millimeter. Centimeter belongs in the CGS unit system (centimeter-gram-second system) while liter belongs in the SI (Système International d'Unités) unit system. These two are equal.
Explanation:
PLEASE ANSWER ASAP NEED ANSWER!!!!!!!!!!!!!! 75 POINTS
Which statement about pure substances and molecules is correct?
A. Pure substances cannot be molecules.
B. All molecules are pure substances.
C. Molecules cannot be pure substances.
D. All pure substances are molecules.
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Answer:
D. All pure substances are molecules.
The correct statement about pure substances is; "All molecules are pure substances."
A pure substance contains exactly the same type of atoms. In a molecule, there can only be a particular combination of atoms.
For instance, a molecule of HCl can only contain chlorine and hydrogen atoms.
This means that every molecules are also pure substances.
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If a stronger solution of sodium bicarbonate was used in beaker C, would it require more or less hydrochloric acid to neutralize and why?
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Part A; A stronger solution of sodium bicarbonate require more hydrochloric acid will be required
Part A; The reason why more HCl is required is due to the presence of more hydroxyl ions in the solution
The reason arriving at the above responses are as follows;
Part A
Sodium bicarbonate, NaHCO₃, is baking soda = A basic salt; has the capacity to deprotonate water
Hydrochloric acid, HCl = An acid
The reaction between sodium bicarbonate and hydrochloric acid is presented as follows;
NaHCO₃ + HCl → CO₂ + H₂O + NaCl
The equation for the ionic reaction is as follows;
Na⁺(aq) + HCO₃⁻(aq) + H⁺(aq) + Cl⁻(aq) → Na⁺(aq) + Cl⁻(aq) + H₂O(l) + CO₂(g)
In water, we have;
HCO₃⁻(aq) + H₂O(l) ⇄ H₂CO₃(aq) + OH⁻(aq)
The presence of a stronger solution of sodium bicarbonate, will produce more hydroxyl ions, OH⁻(aq), which will require, more HCl to neutralize
Therefore, if a stronger solution of sodium bicarbonate was used, more hydrochloric acid will be required
Part B
The solution of stronger sodium bicarbonate will contain a higher concentration of hydroxyl ions and therefore, require more HCl, to neutralize
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The lines of latitude are measured
from a line at the center of the Earth
called the
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Answer:
parallels
Explanation:
hope it may help you
The allele for dimples is dominant and the allele for no dimples is recessive. If two parents that are heterozygous for dimples produce a child, what are the chances the child will have dimples? A. 25% B. 50% C. 75% D. 100%
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The chances the child will have dimples is 50%. Hence The correct option is (B).
What is Heredity ?Heredity, also called inheritance or biological inheritance, is the passing on of traits from parents to their offspring; either through asexual reproduction or sexual reproduction, the offspring cells or organisms acquire the genetic information of their parents.
There is a 50% chance that the child does not obtain the allele needed for dimples (dd), and a 50% chance that the child is heterozygous (Dd). Because dimples is an autosomal dominant trait, heterozygosity will express dimples, leading to a 50% chance that the child will have dimples.
Therefore, The chances the child will have dimples is 50%. Hence The correct option is (B).
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write any two effect of gravity
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how many hours are in 25 years?
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examps of sources of primary pollutants
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Answer:
Primary pollutants can be emitted from many sources including cars, coal-fired power plants, natural gas power plants, biomass burning, natural forest fires, volcanoes, and many more. The effects of primary pollutants are of concern as they can be harmful to humans, animals and plants.Sep 3, 2018
Explanation:
A primary source results from the direct emissions from an air pollution source. In contrast, a secondary source results from the formation of a pollutant in the atmosphere from the chemical reaction of precursors emitted from air pollution sources.
is time a fundamental quantities or units?
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Answer: Its fundamental quantities
The SI is on the seven SI base units for seven base quantities.
pls mark brainliest
3(b) The balloon did not burst when it is pressed onto 100 nails because
1. the nails are not sharp
2.the surface area of 100 nails produce high pressure on the balloon
3. the larger surface area of 100 nails produce low pressure on the balloon
3(c) To reduce pressure on the contact surface, we must apply force onto the .................... surface area.
1.largest
2.smallest
3. Any size of
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3(c) to reduce pressure force must be applied to the largest surface area (1)
pressure = Force/Area
What types of atoms typically form covalent bonds?
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Answer: In a covalent bond, the atoms bond by sharing electrons. Covalent bonds usually occur between nonmetals. For example, in water (H2O) each hydrogen (H) and oxygen (O) share a pair of electrons to make a molecule of two hydrogen atoms single bonded to a single oxygen atom.
Explanation:
The ideal gas constant R can be denoted as _______.
A. R = 9.315 (Pa × m3) / (mole × K)
B. R = 9.315 J / (mole × K)
C. R = 0.0821 (L × atm) / (mole × K)
D. All of the Above E. None of the Above
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in the unit of J/(mole x K) and (Pa x m3)/ (mole x K) the value should be 8.314
Equal masses of five unknown non-electrolytes are dissolved in water and the boiling point elevations are measured. Rank the following non-electrolytes from highest to lowest molar mass.
A. Boiling point of D (aq) = 103.2 degree C
B. Boiling point of A (aq) = 102.4 degree C
C. Boiling point of E (aq) = 101.3 degree C
D. Boiling point of B (aq) = 101.9 degree C
E. Boiling point of C (aq) = 100.5 degree C
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Consider the addition of NaCl to the ice-water mix in Part II. Which of the following statements is TRUE?
a. Salt lowers the freezing point of water by interfering with the intermolecular forces of the water molecules, allowing for more interactions between water molecules.
b. Salt lowers the freezing point of water by interfering with the intermolecular forces of the water molecules, allowing for less interactions between water molecules.
c. Salt raises the freezing point of water by interfering with the intermolecular forces of the water molecules, allowing for less interactions between water molecules
d. None of the above are correct.
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salt lowers the freezing point of water (colligative property) by lowering the interaction and intermolecular forces between water molecules
Salt lowers the freezing point of water by interfering with the intermolecular forces of the water molecules, allowing for less interactions between water molecules.
What is freezing point?The Freezing point is the temperature of a liquid at which it changes its state from liquid to solid at atmospheric pressure.
Salt molecules block water molecules from packing together when temperature is lowered. It then prevents them from becoming ice. More water molecules leave the solid phase than the ones entering the solid phase. Freezing point depression occurs when the freezing point of the liquid is lowered by addition of solute.
Hence, option B is correct.
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