The indivisibility of an atom was proved wrong and no longer accepted today.
What is an atom?An atom is a particle of matter that uniquely defines a chemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons.
The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons.
Hence, an atom is the smallest particle that takes part in chemical reactions.
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i need help with question 48
Answer:
V H2SO4=30 ml=0.03 l
Cm=16M
CM=n/V
n=CM×V
n= 0.48 moles H2SO4
Cm=0.48/0.3
CM=1.6M
Answer B
A pinch of salt has
approximately 3.29x1021 formula units of NaCl. How
many moles of NaCl are in a pinch of salt?
13.29 X [tex]10^{21}[/tex] moles of NaCl are in a pinch of salt and a pinch of salt has
approximately 3.29x[tex]10^{21}[/tex] formula units of NaCl.
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 kilogram of carbon 12; its symbol is “mol”.
We know that 1 formula unit of sodium chloride has a molar mass of 58.44g/mol
Hence;
Mass of 1 formula unit = 58.44g
Mass of 3.29 x [tex]10^{21}[/tex] formula units
13.29 x [tex]10^{21}[/tex] x 58.44g
776.6676 x [tex]10^{21}[/tex]
Moles =[tex]\frac{776.6676 X 10^{21} }{ 58.44g}[/tex]
Moles = 13.29 X [tex]10^{21}[/tex]
Therefore;
13.29 X [tex]10^{21}[/tex] moles of NaCl are in a pinch of salt.
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350.0-mL of 0.50 M hydrogen sulfate solution is reacted with 15.0 grams of sodium hydroxide. What volume of water will be produced?
The volume of water that will be produced from the reaction will be 6.3 mL
Stoichiometric calculationFrom the equation of the reaction:
[tex]H_2SO_4 + 2NaOH --- > Na_2SO_4 + 2H_2O[/tex]
The mole ratio of hydrogen sulfate to sodium hydroxide is 1:2.
Mole of hydrogen sulfate = 0.50 x 350/1000 = 0.175 moles
Mole of 15 grams sodium hydroxide = 15/40 = 0.375 moles
Thus, hydrogen sulfide is the limiting reagent.
Mole ratio of hydrogen sulfide to water = 1:2.
Equivalent mole of water = 0.175 x 2 = 0.35 moles
Mass of 0.35 moles of water = 0.35 x 18 = 6.3 grams.
1 gram of water = 1 ml.
Thus, 6.3 grams of water will be equivalent to 6.3 mL
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Saturn has a diameter of 74,898 miles. What is its diameter in kilometers? (1
mile = 1.6 kilometers)
Answer:
119836.8 km
Explanation:
74 898 miles * 1.6 km / mile = 119836.8 km
Name all these please I need help. Write the names of the fallowing accoring to the IUPAC rules.
#1
You used red pen highlight which made things messier
The correct name should be.
9-methyl dec-1,2-dieneAs a methyl group attached with 9th carbon
#2
methyl group at 4
double bond at 2
4-Methyl Pent-2-ene#3
Three methyl groups are present
Double bond at 2
2,5,5-Trimethyl Hex-2-ene#4
2,5-Dimethyl Hept-3,5-diene#5
2,5-Dimethyl Hex-3-ene
The diagram below shows the geometric structure of the molecule of water H2O what do the symbols (the bigger gray circle) and (the smaller black circle) represent in the model?
1) genetic material
2) cells
3) chemical bonds
4) atoms
Answer:
Chemical bonds
Explanation:
Because it has an image of atoms being held together by chemical bonds.
G.P.E. on Earth is determined by an object's _______and _______
Answer:
mass and height of the object.
If you have 100 ml of water mixed with 100 ml of pollutant, the concentration of pollutant is
The concentration of pollutants is equal to the concentration of water.
What is concentration?The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution.
The concentration of water is 100 ml and the concentration of pollutants is 100 ml .
Hence, If you have 100 ml of water mixed with 100 ml of pollutant, the concentration of pollutant is equal to water.
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A 80.0 mL sample of nitrous acid of unknown concentration is titrated with 36.2 mL of 1.45 M barium hydroxide. Determine the concentration of the acid solution.
Answer: 0.66 M
Explanation:
[tex]M_{A}V_{A}=M_{B}V_{B}\\(80.0)M_{A}=(36.2)(1.45)\\M_{A}=\frac{(36.2)(1.45)}{80.0} \approx \boxed{0.66 \text{ M}}[/tex]
What change in volume results if 50 mL of gas is cooled from 30 C to 4 C
increases by 4.29 mL
decreases by 4.29 mL
decreases by 45.7
increases by 6.66 mL
The relation between the volume of the gas and the temperature is established by Charles's law. With a decrease in the temperature, the volume decreases by 45.7 mL. Thus, option c is correct.
What is Charle's law?Charle's law states the direct relation present between the temperature and the volume of the gas. The law is given as:
V₁ ÷ T₁ = V₂ ÷ T₂
Given,
V₁ = 50 mL
T₁ = 303.15 K
T₂ = 277.15 K
Substituting the value the final volume is calculated as:
50 ÷ 303.15 = V₂ ÷ 277.15
V₂ = (50 × 277.15) ÷ 303.15
= 45.71 mL
Therefore, option c. 45.7 mL is the final volume.
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When energy decreases what happens to particle motion?
Answer:
When a substance is cooled, its internal energy decreases: the movement of its particles decreases. bonds between particles form when a substance condenses or freezes, or sublimes to form a solid from a gas. What is called energy? Energy is the capacity of a physical system to do work.
Explanation:
1. What is the molarity of a solution prepared by dissolving 3.11 grams of NaOH in
enough water to make 300 milliliters of solution?
The molarity of a solution prepared by dissolving 3.11 grams of NaOH in
enough water to make 300 milliliters of solution is 0. 256 mol/ L
Explanation:
What is Molarity?Molarity (M) is the amount of a substance in a given volume of solution. It is otherwise known as the number of moles of solute in a certain amount of solution.
The unit of molarity is mol/L
Formula for calculating molarity :Molarity = number of moles of solute divided by the volume of the solution\
ParametersMolarity = ?
Number of moles is calculated using :
Mass of the solute = 3.11 grams of NaOH
Molar mass of the solute = Na + O + H
Let's input the atomic numbers of the elements: Na (23) , O (16) , H (1)
Molar mass of NaOH = 23 + 16 + 1 = 40 g/ mol
Number of moles = 3.11 ÷ 40 = 0.077 mol
Volume of the solution is measured in Liters
Let's convert 300 milliters to liters = 300 divided by 1000 = 0.3 Liters
Molarity = 0.077 ÷ 0.3 = 0. 256 mol/ L
Therefore, the Molarity of the solution is 0. 256 mol/ L
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At a consent tempture the pressure on a 2.5 l ballon is increased from 2.4 atm to 5.8 atm. what is the new volume?
Answer:
1.034 L
Explanation:
P1 V1 = P2 V2
P1 V1 / P2 = V2
2.4 (2.5) / 5.8 = V2 = 1.034 L
People in the southern united states imported the plant kudzu from japan to control erosion along highways kudzu now spreads so quickly that it kills many
other plants. how have humans directly impacted the environment in this example?
a introduction of a non-native species
b destruction of habitat
c disruption of a food chain
d. overexploitation
Humans directly impacted the environment by destroying of the habitat of the other plants. Hence, option B is correct.
What is Kudzu plant?Kudzu vine is known as a fast-growing plant since the '30s and 40's when the Soil Conservation Service paid about 8$ to every farmer who can plant an acre with this plant.
Kudzu overgrows and crowds out native plant population, for sunlight and nutrients. Therefore, it's considered 'invasive'.
It grows so quickly that it cannot be controlled and disturb other habitats of plants. Hence, option B is correct.
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A chemist wishes to perform the following reaction: N2 + 3 H2 → 2 NH3 If only 14.0 g of N2 is available, what is the minimum amount, in grams, of H2 needed to completely react with this quantity of N2?
Answer:
3 grams
Explanation:
14 g of N2 is 1/2 mole
If you halve the N2 in the balanced equation , you have to halve the H2 down to 1.5 moles of H2 which is 3 grams
Can anyone help me figure this out
Answer:
go with the fourth one because I did that one
Need help ASAP!
How many moles of gas does it take to occupy 520 mL at a pressure of 400 torr and a temperature of 340 K? Use the conversion factors 760 torr = 101.3 kPa and 1 mL = 0.001 L. Show all of your work.
Answer: B - 0.0098 moles
Explanation:
<3
Select the correct answer.
a sample of an element was poured from one container into a second container. it took on the shape of the second container. it was then
cooled. after cooling, the element was removed from the container and kept its new shape. what happened to the atoms of the element wt
they were cooled in the second container?
oa. they began to escape into the air.
ob. they stopped being attracted to nearby atoms.
oc. they stopped moving past the atoms around them.
od. they began to move more quickly.
A 57.6 g sample of methane (CH4) is found to contain 43.2 g of carbon. What is the
percent composition of Carbon and Hydrogen? How much hydrogen (in grams) would a
37.8 g sample of methane contain?
Answer:
Explanation:
The atomic mass of carbon is 12.011 g/mol.The atomic mass of hydrogen is 1.00794 g/mol.This means that the atomic mass of methane is 12.011+4(1.00794)=16.04276 g/mol.
The percent composition by mass of carbon is [tex]\frac{12.011}{16.04276} \times 100=\boxed{74.9\%}[/tex]The percent composition by mass of hydrogen is [tex]\frac{4(1.00794)}{16.04276} \times 100=\boxed{25.1\%}[/tex]This means that in a 37.8-gram sample of methane, there would be [tex](37.8)\left(\frac{25.1}{100} \right)=\boxed{9.49}[/tex] grams of hydrogen.
When calculating specific heat, what does the variable 'Q'
represent?
A. Mass
B. Specific heat capacity
C. Latent heat
D. Thermal energy
Answer:
D.) Thermal energy
Explanation:
I got it correct on founders edtell
which compund do not exist in independant molecular form
Answer:
Ionic compounds do not exist in independent molecular form
-Lexi
What always occurs during a nuclear fission reaction?.
help please it's due in 12 hours
(20 points)
Answer:
1) K and Rb
2) 20 protons, 20 neutrons, and 20 electrons.
Explanation:
1) If it's in the same column, it has the same # of valence electrons (e- on the outer shell), therefore similar chemical properties.
2)
1) atomic #, 20, is the number of protons
2) subtract the mass number from # of protons, which you get 20 neutrons
3) Number of electrons in a neutral atom = number of electrons, which is 20. You can also check yourself by looking at electron configuration on a full periodic table.
(05.04 MC)
Based on the equation, how many grams of Br₂ are
required to react completely with 42.3 grams of
AICI3? (5 points)
2AlCl3 + 3Br2 → 2AIBr3 + 3Cl₂
Select one:
O a.
66.5 grams
O b.
71.2 grams
O c. 76.1 grams
O d. 80.2 grams
Answer: C
Explanation:
The atomic mass of aluminum is 26.98154 g/mol.The atomic mass of chlorine is 35.453 g/mol.So, the formula mass of aluminum chloride is 26.98154+3(35.453)=133.34054 g/mol.
This means that 42.3 grams of aluminum chloride are 42.3/133.34054=0.31723285356426 moles.
From the equation, we know that for every 3 moles of bromine consumed, 2 moles of aluminum chloride are consumed.
This means that (0.31723285356426)(3/2)=0.47584928034639 moles of bromine are needed.
The atomic mass of one bromine atom is 79.904 g/molSo, the formula mass of a bromine molecule is 2(79.904)=159.808 g/mol, and thus the answer is (159.808)(0.47584928034639), which is about 76.1 g
Why is the alkyl bromide substrate below not capable of undergoing an E2 elimination reaction upon treatment with potassium hydroxide (KOH) in ethanol (EtOH)
An E2 mechanism is not followed because an anti periplanar E2 elimination is impossible due to the lack of beta hydrogen.
What is elimination?The term elimination has to do with the removal of a proton from the substrate by a base.
This question is incomplete and the complete question showing the options have been shown in the image attached to this answer.
This elimination results in an alkene being formed. For the substrate alkyl halide shown in the question, an E2 mechanism is not followed because an anti periplanar E2 elimination is impossible due to the lack of beta hydrogen.
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4. What is a homogeneous solution? Give an example.
Answer:
Homogeneous solutions are solutions with uniform composition and properties throughout the solution.
Explanation:
For example a cup of coffee, perfume, cough syrup, a solution of salt or sugar in water, etc. Heterogeneous solutions are solutions with non-uniform composition and properties throughout the solution.
Answer:
A homogeneous mixture is a mixture in which the composition is uniform throughout the mixture. Example: The salt water is homogeneous because the dissolved salt is evenly distributed throughout the entire salt water sample. Another examples are wine, blood, vinegar
Explanation:
PLEASE HELP ME IN THIS QUESTION Insecticides were sprayed on the grains to kill insects that way the crops. Unfortunately, the toxins in the insecticides never leave the food chain and can have serious consequences for those organism at the top of the food chain. What is this an example of? Explain how the insecticides could kill the owls but not the grasshopper or mice?
The insecticides could kill the owls but not the grasshopper or mice due to no resistance in owls as compared to grasshopper and owl.
How the insecticides could kill the owls?The insecticides could kill the owls but not the grasshopper or mice because the active ingredients in that insecticide is harmful for owls while on the other hand, the grasshopper and mice are tolerant to that insecticide.
So we can conclude that the insecticides could kill the owls but not the grasshopper or mice due to no resistance in owls as compared to grasshopper and owl.
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what is the number of grams of N₂ (g) that contains 1.80 x 10^24 molecules?
Answer:
83.69 gm
Explanation:
molar weight of N2 = 28
Find the number of moles then multiply by this
1.8 x10^24/ (6.022x10^23) * 28 =83.69 gm
In which part of water cycle energy absorbed by water
Answer:
Latent heating
Explanation:
As this occurs, liquid water absorbs energy, causing it to evaporate and form water vapor. The process of evaporation absorbs tremendous amounts of incoming solar energy.
Which type of scientist would most likely study how electricity could be
produced more efficiently?
Electrical engineers are the scientists that study the production of electricity more efficient.
Which type of scientist would study how electricity could be produced more efficiently?
Electrical engineers are the type of scientist that would most likely study how electricity could be produced more efficiently because they produced new technologies which are cost efficient as well as produce high amount of electricity.
So we can conclude that electrical engineers are the scientists that study the production of electricity more efficient.
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