Answer:
one factor is the speed at which crystals are formed
explanation:crystals that are formed near or on the surface tend to crystalize faster and therefore are usually smaller crystals deeper in the crust tend to crystalize slower and therefore are larger
4. The half-life of F-20 is 11.0 s. If a sample initially
contains 5.00 g of F-20, how much F-20 remains after
44.0 s
The amount of the F–20 that will remain after 44 s given the data from the question is 0.3125 g
Data obtained from the question Half-life (t½) = 11 sOriginal amount (N₀) = 5 gTime (t) = 44 sAmount remaining (N) = ?How to determine the number of half-lives Half-life (t½) = 11 sTime (t) = 44 sNumber of half-lives (n) =?
n = t / t½
n = 44 / 11
n = 4
How to determine the amount remaining Original amount (N₀) = 5 gNumber of half-lives (n) = 4Amount remaining (N) = ?N = N₀ / 2ⁿ
N = 5 / 2⁴
N = 5 / 16
N = 0.3125 g
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Find the empirical formula of a compound containing 26.56% potassium, 34.51% chromium, and the remainder oxygen.
Answer:
K₂Cr₂O₇
Explanation:
Finding % of O
% O = 100% - % K - % Cr% O = 100% - 26.56% - 34.51%% O = 73.44% - 34.51%% O = 38.93%Steps
Change % of each element into grams.Convert grams of each element into moles by dividing grams by molar mass.Divide all moles by the smallest number of moles.If the moles are all whole numbers, then you’re done and that’s your empirical formula.If not, multiply all moles by number such that everything is a whole number.Solving
We have 26.56g of K, 34.51g of Cr, and 39.93g of O
Moles of K, n(K) = 26.56/39.0983 = 0.68 molesMoles of Cr, n(Cr) = 34.51/51.9961 = 0.66 molesMoles of O, n(O) = 38.93/15.9994 = 2.43 molesK = 0.68/0.66 ≈ 1 x 2 = 2Cr = 0.66/0.66 = 1 x 2 = 2O = 2.43/0.66 = 3.5 x 2 = 7The empirical formula is K₂Cr₂O₇
What type of energy is being used by the roller coaster at each point? 8 9) 10) 11) 8) 9) 10) 11) A) Potential Energy A) Gaining Potential Energy A) Potential Energy A) Gaining Potential Energy B) Kinetic Energy B) Gaining Kinetic Energy B) Kinetic Energy B) Gaining Kinetic Energy
Answer:
Answers are below !
Explanation:
8) A) Potential Energy
9) B) Gaining Kinetic Energy
10) B) Kinetic Energy
11) A) Gaining Potential Energy
What is the name of the functional group that is attached to this hydrocarbon?
H
H
• alkyl halide
alcohol
carbonyl
ketone
Two molecules having different sizes but the same functional groups will take part in chemical reactions. Functional groups are used in the field of organic chemistry. Here the given molecule has ketone functional group. The correct option is D.
What are functional groups?The substituent atoms or groups of atoms which are attached to specific molecules are defined as the functional groups. These moieties are responsible for the chemical reactions. The same functional group will experience comparable reactions regardless of the chemical in which it is present.
A ketone is a functional group which consists of a carbonyl carbon bound to an oxygen atom by a double bond and two alkyl or aryl groups. Ketones are usually represented as RCOR, where two R's can be any alkyl or aryl group. Their general formula is CₙH₂ₙO.
Lower ketones are soluble in water because they consist of the polar carbonyl group.
Thus the correct option is D.
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How much of a 14.0 M HNO3 solution should you use to make 840.0 mL of a 0.300 M HNO3 HNO3 solution?
39200 mL of a 14.0 M [tex]HNO_3[/tex] solution should you use to make 840.0 mL of a 0.300 M [tex]HNO_3[/tex] solution.
What are moles?The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilograms of carbon 12; its symbol is “mol”.
Solution:
[tex]M_1V_1 = M_2V_2[/tex]
In this case, [tex]M_1[/tex] = 840.0 mL, [tex]V_1[/tex]= 14.0 M , [tex]M_2[/tex]= 0.300 M
Substituting the value in the equation:
[tex]V_2[/tex] = [tex]\frac{840.0 X 14.0}{0.300}[/tex]
= 39200 mL
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Heat flows–
A. from high places to low place.
B. from colder places to hotter places.
C. from hotter places to colder places.
D. from low places to high places
Answer:
A. from high places to low places
How many milliliters of a 12% (v/v) propyl alcohol solution would you need to obtain 7.5 mL of propyl alcohol? Answer to the tenth
[tex]\tt \dfrac{7.5}{12}\times 100=62.5~ml[/tex]
Gatorade
Which of the following is NOT a unit used to measure gas pressure? *
O liters (L)
Omillimeters of mercury (mmHg)
Oatmospheres (atm)
Okilopascals (kPa)
Answer:
liter
Explanation:
liter is the unit of liquid
Which statements describe a mixture? Choose all correct answers. In a mixture, the properties of every substance change. A mixture can be separated by a filter. A mixture produces a completely new substance. In a mixture, molecules can mix, but do not change completely. A mixture can be separated only by chemical means. In a mixture, no chemical changes take place.
a mixture can be separated by a filter
How do we use Chemistry everyday?
Answer:
Discoloration of leaves.
Food Digestion.
Common salt.
Icefloating on water.
Tears while chopping onions.
Sunscreen.
Medicines.
Hygiene.
i gave you 8 answers. :)
Which do you predict to have the greater electron affinity, Na or Na+ ? And why?
10. Halothane is a popular inhalation anesthetic. It contains 12.15% carbon, 28.86%
fluorine. .506% hydrogen, 40.5% bromine, and 17.97% chlorine. What is the
empirical formula for this ssubstance?
Answer:
Halothane is a popular inhalation anesthetic. It contains 12.15% carbon, 28.86% fluorine, .506% hydrogen, 40.5% bromine, and 17.97% chlorine.
Explanation:
Which is it ? U think
Answer:
A
Explanation:
Took the test
What solution does ?
how many mL of 0.1M HCl are required to react completely with 1 g mixture of [tex] Na_{2}CO_{3}[/tex] and [tex] NaHCO_{3} [/tex] containing equimolar amounts of both ?
ty! :)
Answer:
158 mL
158 mL of 0.1 M of HCl is required to react completely with 1 g mixture of Na2CO3 and NaHCO3, containing equimolar amounts of both
Explanation:
hope helpez -,-~
btw masoom bachi copied me~
contribution of chemistry in medicines
Answer:
Chemistry in Medicine
Explanation:
Major contributions to health care have been made by chemistry. The development of new drugs involves chemical analysis and synthesis of new compounds. Many recent television programs advertise the large number of new
drugs produced by chemists.
BRAINLIEST MEEEE PLSS
How many grams of rubidium are in 2.39 x 10^24 atoms of rubidium?
Avogadro's number is the number of the particles in a mole of a substance. There are 339 grams of (Rb) rubidium in the sample.
What are atoms?Atoms are the fundamental of the matter that is unsplittable into fine particles.
We know, that 1 mole = 6.022 x 10²³ atoms
So, moles in 2.39 x 10²⁴ atoms will be calculated and converted into mass by using the molar mass of the substance.
2.39 x 10²⁴ × (1 ÷ 6.022 x 10²³) × 85.468 = 339 g Rb
Therefore, 339 g Rb is present in the sample.
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Okay which is the answer
Answer:
KOH
Explanation:
When ionic compounds (a metal and a nonmetal) dissolve, they are good conductors of electricity, and would result in the brightest light. Weak bases and covalent compounds do not dissolve, so KOH, a strong base and ionic compound, would dissolve and conduct electricity.
Calculate the [H+], given the pH is 2.5
a
0.31 M
b
0.25 M
c
0.50 M
d
0.003 M
Answer:
D. 0.003
Explanation:
To find [H+] given pH, you do 10^-[pH]
10^-2.5 = 0.003
Jenny tells her teacher that most liquids expand when they freeze into solids because the particles in the liquid gain energy and move farther apart. Is she correct why or why not
Jenny tells her teacher that most liquids expand when they freeze into solids because the particles in the liquid gain energy is False.
What is Freezing?This is the type of matter change which is characterized by a liquid turning into a solid.
The particles lose energy and the molecules move closer to each other which is why False was chosen.
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Please help!!! Only one try. Explain why the answer is the right answer
Which equation is an example of artificial transmutation
Answer:Nitrogen can be transformed into oxygen by bombarding an alpha particle into the nucleus of nitrogen. An atom of hydrogen is produced as part of the transformation. Aluminum is transformed into phosphorous by combining the nucleus with an alpha particle
Explanation:
Which one of the following statements about nuclear reactions is false?
(a) Particles within the nucleus are involved.
(b) No new elements can be produced.
(c) Rate of reaction is independent of the presence of a catalyst.
(d) Rate of reaction is independent of temperature.
(e) They are often accompanied by the release of enormous amounts of energy.
The statement 'No new elements can be produced' about nuclear reactions is false (Option b).
What are nuclear reactions?Nuclear reactions are specific reactions that involve atomic nuclei such as fusion reactions and fision reactions.
The atomic nuclei are composed of particles that can react to form new atoms (i.e., protons and neutrons).
In conclusion, the statement 'No new elements can be produced' about nuclear reactions is false (Option b).
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How many grams of Copper are in 500grams of Cu2CO3?
Answer:
Explanation:
Calculate the molar mass of Cu2CO3 in grams per mole or search for a chemical formula or substance. Molecular weight of Cu2CO3. ... Copper: Cu: 63.546: 2: 67.927%: Carbon: C: 12.0107: 1: ... it tells us how many grams …
Which one of the following statements is NOT
applicable to molecular solids?
1. Molecular solids are usually excellent conductors of electric current.
2. Molecular solids have relatively low melting points.
3. Molecular solids are soft compared to covalent solids.
Answer:
1. Molecular solids are usually excellent conductors of electric current.
Explanation:
Molecular solids are actually insulators (prevent electricity).
1. 24.76 grams of potassium carbonate (K2CO3) is reacted with an excess of aluminum nitrate (Al(NO3)3) to produce potassium nitrate (KNO3) and aluminum carbonate (Al2(CO3)3). How many grams of the product Al2(CO3)3 is formed? Round to the nearest hundredth.
Excess reagents are the chemical species that remain after the reaction completion. 14 gms of aluminum carbonate will be formed.
What are grams?Grams are the unit of the mass that is defined by the product of the moles and the molar mass of the substance.
The balanced chemical reaction is shown as:
3 K₂CO₃ + 2 Al(NO₃)₃ → Al₂(CO₃)₃ + 6 KNO₃
From the reaction, it can be said that 2 moles of aluminum nitrate are required to produce a mole of aluminum carbonate.
Moles of potassium carbonate are calculated as:
Moles = 24.76 gm ÷ 138.205 g/mol = 0.179 moles
If 3 moles of potassium carbonate produce 1 mole of aluminum carbonate, then 0.179 moles will produce 0.059 moles.
From the moles, mass is calculated as:
Mass = moles × molar mass
= 0.059 moles × 234.08 g/mol
= 13.97 gms
Therefore, 14 gms of aluminum carbonate will be formed.
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What is the molecular mass
Which process is necessary for the formation of igneous rocks?
(A) erosion (C) magma solidification
(B) deposition (D) metamorphism
Answer:
C - magma solidification
Explanation:
Igneous rock is created through heating and cooling of magma (lava).
As hot, molten rock rises to the surface, it undergoes changes in temperature and pressure that cause it to cool, solidify, and crystallize.
Clarence grew three bearded iris plants. He put one in direct sunlight, one in
the shade, and one in the dark. The plant in the sun grew the most quickly and
looked the healthiest. Clarence concluded that bearded iris plants grow best
in the sun.
How would you evaluate Clarence's conclusion?
A. His conclusion is valid because his experiment included a control.
B. His conclusion is flawed because it is based on the appearance of the plants
C. His conclusion is flawed because he did not perform enough trails
D. His conclusion is bailed because he tested only one variable
Help! 100 point and I will give a brainliest and 5 star for solving this question.
100ml of 0.1 N H2SO4 by diluting from original H2SO4.
Atomic mass of: O=16 , H=1 S=32
d H2SO4=1.08 purity%=98%
i need the solution.
Mass of H_2SO_4 required
Molarity
Moles of solute/Volume of solution in LSo
0.1=n/0.1Ln=0.1(0.1)n=0.01molNow molar mass of H_2SO_4
2(1)+32+4(16)2+32+6498g/molMass
98(0.01)0.98ghelp me with this one please.
calculate the solubility of AgCl in:
100ml of 4×10^-3M calcium nitrate
(Ksp is = 1.6 ×10^-10)