Explanation:
Pure substances are elements and compounds. These substances have the following properties:
All parts are the same throughout which implies that they are homogeneous. They have a definite composition. They cannot be easily separated or broken down into simpler substances by physical meansSeparation by physical means is not possible They have unique sets of physical properties.Heterogeneous mixtures have completely opposite properties as the pure substances as given above.
View the video clip below and answer the question.
The video clip above illustrates the process of
Blank 1:
Answer:
i think the answer is accretion
Answer:
Asteroid or exploding planet.
Explanation:
Asteroid or exploding planet.Asteroid or exploding planet.Asteroid or exploding planet.Asteroid or exploding planet.Asteroid or exploding planet.Asteroid or exploding planet.Asteroid or exploding planet.
3 A roller coaster car travels up a hill until it reaches the top, slowly goes over, and speeds down the hill and through the nust of the roller coaster. At the end, the brakus quickly stop the car and the riders appear to continue moving forward. Which of Newton's laws of motion best applies to the riders of the roller coaster?
Answer:
3rd law
Explanation:
What do we call the modern atomic theory? What scientists' ideas is it a combination of?
Answer:
•Atomic theory, ancient philosophical speculation that all things can be accounted for by innumerable combinations of hard, small, indivisible particles (called atoms) of various sizes but of the same basic material; or the modern scientific theory of matter according to which the chemical elements that combine to form the great variety of substances consist themselves of aggregations of similar subunits (atoms) possessing nuclear and electron substructure characteristic of each element. The ancient atomic theory was proposed in the 5th century BC by the Greek philosophers Leucippus and Democritus and was revived in the 1st century BC by the Roman philosopher and poet Lucretius. The modern atomic theory, which has undergone continuous refinement, began to flourish at the beginning of the 19th century with the work of the English chemist John Dalton. The experiments of the British physicist Ernest Rutherford in the early 20th century on the scattering of alpha particles from a thin gold foil established the Rutherford atomic model of an atom as consisting of a central, positively charged nucleus containing nearly all the mass and surrounded by a cloud of negatively charged planetlike electrons.
•With the advent of quantum mechanics and the Schrödinger equation in the 1920s, atomic theory became a precise mathematical science. Austrian physicist Erwin Schrödinger devised a partial differential equation for the quantum dynamics of atomic electrons, including the electrostatic repulsion of all the negatively charged electrons from each other and their attraction to the positively charged nucleus. The equation can be solved exactly for an atom containing only a single electron (hydrogen), and very close approximations can be found for atoms containing two or three electrons (helium and lithium). To the extent that the Schrödinger equation can be solved for more-complex cases, atomic theory is capable of predicting from first principles the properties of all atoms and their interactions. The recent availability of high-speed supercomputers to solve the Schrödinger equation has made possible accurate calculations of properties for atoms and molecules with ever larger numbers of electrons. Precise agreement with experiment is obtained if small corrections due to the effects of the theory of special relativity and quantum electrodynamics are also included.
I hope it's help you
can someone tell me what sexual reproduction is but like in your own words
Answer:
its when 1 male, produces a sperm, which them goes to fuse with the sperm from the female.
How many moles are equal to 9.03x10^24 molecules of water (H20)?
15.0 mol H₂O
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
BracketsParenthesisExponentsMultiplicationDivisionAdditionSubtractionLeft to RightChemistry
Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
9.03 × 10²⁴ molecules H₂O
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 9.03 \cdot 10^{24} \ molecules \ H_2O(\frac{1 \ mol \ H_2O}{6.022 \cdot 10^{23} \ molecules \ H_2O})[/tex]Multiply/Divide: [tex]14.995 \ mol \ H_2O[/tex]Step 4: Check
Follow sig figs rules and round. We are given 3 sig figs.
14.995 mol H₂O ≈ 15.0 mol H₂O
How many atoms are there in 7.80 moles of germanium
4.70 × 10²⁴ atoms Ge
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
BracketsParenthesisExponentsMultiplicationDivisionAdditionSubtractionLeft to RightChemistry
Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
7.80 mol Ge
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[tex]\displaystyle 7.80 \ mol \ Ge(\frac{6.022 \cdot 10^{23} \ atoms \ Ge}{1 \ mol \ Ge} )[/tex] = 4.69716 × 10²⁴ atoms Ge
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
4.69716 × 10²⁴ atoms Ge ≈ 4.70 × 10²⁴ atoms Ge
Name at least two benefits coral reefs provide.
Name at least two benefits coral reefs provide.
Answer:
1. provide habitats and shelter for many marine organisms 2. Coral reefs protect coastlines from storms and erosion 3. provide jobs for local communities
Explanation:
Answer:
Coral reefs are home to more species of fish and marine invertebrates than any other habitat in the world. Coral reefs protect beaches and shorelines from the impact of waves. Without coral reefs, beaches and shorelines can be severely damaged or washed away. Corals also produce unique chemicals that have potential uses in medicine.
Explanation:
trust me
Calculate the molarity of 8.42 x 102 mL of solution containing 22.4 g of potassium iodide.
Answer:
Molarity = 0.154 M
Explanation:
Given data:
Volume of solution = 8.42 × 10² mL ( 8.42 × 10² /1000 = 0.842 L)
Mass of potassium iodide = 22.4 g
Molarity of solution = ?
Solution:
Number of moles of potassium iodide:
Number of moles = mass/molar mass
Number of moles = 22.4 g/ 166.0 g/mol
Number of moles = 0.13 mol
Molarity:
Molarity = number of moles / volume in L
Molarity = 0.13 mol / 0.842 L
Molarity = 0.154 M
A helium balloon at 23 C has a volume of 755 mL. The balloon is placed into a freezer kept at -10 C. Assuming pressure is constant, what is the new volume of the balloon?
Explanation:
T1/V1 = T2/V2
V2 = T2 x V1/T1
V2 = 296.15x535/319.15
V2 = 496.44mL
describe how you would calculate the answer for the question above what is the mass of 3.20 x 10 ^ 23 particles of CO2
Answer:
you would do the exponents first (10 times 23) and then multiply that (230) and 3.20.
Explanation:
That should be correct!:)
If you knew the number of valence electrons in a nonmetal atom how would you determine the valence of the element. (Ignore hydrogen)
Answer:
The possible valances can be determined by electron configuration and electron negativity
Good Luck even though this was asked 2 weeks ago
Explanation:
All atoms strive for stability. The optima electron configuration is the electron configuration of the VIII A family or inert gases.
Look at the electron configuration of the nonmetal and how many more electrons the nonmetal needs to achieve the stable electron configuration of the inert gases. Non metals tend to be negative in nature and gain electrons. ( They are oxidizing agents)
For example Florine atomic number 9 needs one more electron to reach a valance number of 8 electrons to equal Neon atomic number 10. Hence Flowrine has a valance of -1
Oxygen atomic number 8 needs two more electrons to reach a valance number of 8 electrons to equal Neon atomic number 10. Hence Oxygen has a valance charge of -2.
Non metals with a low electron negativity will lose electrons when reacting with another non metal that has a higher electron negativity. When the non metal forms an ion it is necessary to look at the electron structure to determine how many electrons the element can lose to gain stability.
For example Chlorine which is normally -1 like Florine when it combines with oxygen can be +1, +3, + 5 or +7. It can lose its one unpaired electron, or combinations of the unpaired electron and sets of the three pairs of electrons.
Which type of molecule is used by organisms to store and transmit genetic information?
nucleic acids
proteins
lipids
carbohydrates
Answer:
nucleic acids yw
Explanation:
Answer:
nucleic acids
Explanation:
edg
Whoever gets me right gets whatever they want
Nebulae are large clouds of dust and gas that may eventually form stars and planets. Astronomers originally thought that the Andromeda Galaxy was a nebula until the nature of a galaxy was confirmed. Which of the following shows the relationship between a galaxy and a nebula?
Many galaxies are found inside of a single nebula.
Entire galaxies are created from the gas and dust of a single nebula.
Many nebulae are found inside of a single galaxy.
Nebulae and galaxies combine to form stars.
Answer:
many nebulae are found inside of a single galaxy
Explanation:
Answer:
many nebulae are found inside of a single galaxy
Explanation:
What is the charge on one ATOM of plasma?
•negative
•positive
A balloon is filled with helium gas has a volume of 1.0 L at a pressure of 1.0 atm. The
balloon is released and reaches an altitude where the pressure is now 0.4 atm. What is the
new volume of the balloon at this altitude assuming the air temperature has not changed?
Answer:
2.5 LExplanation:
The new volume of the balloon can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
From the question we have
[tex]V_2 = \frac{1 \times 1}{0.4} = \frac{1}{0.4} \\ = 2.5[/tex]
We have the final answer as
2.5 LHope this helps you
Type the correct answer in the box.
Anna used 900 gallons of gasoline last year driving to and from work. This year, she changed jobs. She now uses only 600 gallons of gas annually.
If each gallon of gas releases 20 pounds of CO2 when burned, Anna reduced her CO2 emissions by ______%.
WILL MARK BRAINLIEST
Answer:The answer is 3.33%. Anna reduced her CO2 emissions by 3.33% from using 600 gallons of gas annually than from using 900 gallons of gasoline annually.
Explanation:
a. 20 moles of NH3 are needed to produce how many moles of H2O?
b. How many moles of N2 will be produced if 3.5 moles of O2 react?
a. 30 moles of H₂O
b. 2.33 moles of N₂
Further explanationGiven
a. 20 moles of NH₃
b. 3.5 moles of O₂
Required
a. moles of H₂O
b. moles of N₂
Solution
Reaction
4NH₃+3O₂⇒2N₂+6H₂O
a. From the equation, mol ratio NH₃ : H₂O = 4 : 6, so mol H₂O :
=6/4 x mol NH₃
= 6/4 x 20 moles
= 30 moles
b. From the equation, mol ratio N₂ : O₂ = 2 : 3, so mol N₂ :
=2/3 x mol O₂
= 2/3 x 3.5 moles
= 2.33 moles
The moles of H₂O produced by 20 moles of NH₃ are 30 moles, moles of N₂ produced by 3.5 moles of O₂ is 2.3 moles.
What is moles?
Moles is a unit of mass, which gives information about the relative amount of species present in any reaction.
Given chemical reaction will be represented as:
4NH₃ + 3O₂ → 2N₂ + 6H₂O
From the stoichiometry of the reaction it is clear that-
4 moles of NH₃ = produce 6 moles of H₂O
20 moles of NH₃ = produce 6/4×20=30 moles of H₂O
Again from the stoichiometry of the reaction it is clear that-
3 moles of O₂ = produce 2 moles of N₂
3.5 moles of O₂ = produce 2/3×3.5=2.3 moles of N₂
Hence required moles are 30 moles of H₂O and 2.3 moles of N₂.
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Si se encierran 100 gramos de benceno C6H6 en un recipiente con aire, se observa que, al cabo de cierto tiempo, se han evaporado 1,273 gramos, logr´andose as´ı la saturaci´on del aire con vapor de benceno. En cambio, si se disuelven 10 gramos de un soluto no vol´atil en 100 gramos de benceno y la mezcla se coloca en el recipiente anterior y a la misma temperatura, se observa que se han evaporado 1,205 gramos de benceno. A partir de estos datos, deducir la masa molecular de la sustancia disuelta.
Answer:
La masa molar de la sustancia disuelta es de aproximadamente 138,473 g/mol
Explanation:
Los parámetros dados son;
La masa de benceno en el recipiente = 100 gramos
La masa de benceno que se evapora del benceno puro = 1.273 gramos
La masa del soluto no volátil disuelto en 100 gramos de benceno = 10 gramos
La masa de benceno que se evapora de la mezcla = 1.205 gramos
Según la ley de Raoult, tenemos;
[tex]P_ {solucion} = P_ {solvente} \times X _ {solvente}[/tex]
Dónde;
[tex]P_ {solucion}[/tex] = La presión de vapor de la solución.
[tex]P_ {solvente}[/tex] = La presión de vapor del solvente
[tex]X_ {solvente}[/tex] = La fracción molar del solvente
Por lo tanto;
[tex]X_ {solvente} = \dfrac {P_ {solucion}} {P_ {solvente}}[/tex]
Según la ley de los gases ideales, tenemos;
[tex]P \times V = n \times R \times T = \dfrac{m}{M} \times R \times T[/tex]
Dónde;
P = La presión del gas
V = El volumen ocupado por el gas
m = La masa del gas
M = La masa molar del gas
R = La constante universal de los gases
T = La temperatura del gas
n = El número de moles del gas
Por lo tanto;
[tex]P = \dfrac{m \times R \times T}{M \times V}[/tex]
Donde R, T, M y V son constantes, tenemos P ∝ m
[tex]\therefore X_ {solvente} = \dfrac {P_ {solucion}} {P_ {solvente}} = \dfrac {Masa \ evaporada \ de \ solucion} {Masa \ evaporada \ de \ solvente} = \dfrac {1.205 \ g} {1.273 \ g} \approx 0.9466[/tex]
[tex]X_ {solvente}[/tex] ≈ 0.9466
[tex]X_ {solvente} = \dfrac {El \ numero \ de \ moles \ del \ solvente} {El \ total \ numero \ de \ moles \ de \ la \ solucion}[/tex]
El número de moles del solvente, C₆H₆ = (Masa de C₆H₆) / (La masa molar de C₆H₆) = 100 g / (78.11 g.mol) ≈ 1.28025 moles
El número de moles del solvente, C₆H₆ ≈ 1.28025 moles
El número total de moles = El número de moles del solvente, C₆H₆ + El número de moles del soluto no volátil, [tex]n_ {soluto}[/tex]
[tex]\therefore X_ {solvente} = 0.9466 = \dfrac {1.28025 \ moles} {1.28025 \ moles + n_ {soluto}}[/tex]
0.9466 × (1.28025 moles + [tex]n_ {soluto}[/tex]) = 1.28025 moles
1.21189 moles + 0.9466 × [tex]n_ {soluto}[/tex] = 1.28025 moles
[tex]n_ {soluto}[/tex] = (1.28025 - 1.21189)/0.9466 moles ≈ 0.07221635 moles
[tex]\therefore \dfrac {Masa \ de \ soluto} {Molar \ masa \ de \ soluto} = \dfrac {10 \ g} {Molar \ masa \ de \ soluto} \approx 0.07221635 \ moles[/tex]
[tex]\ Masa \ molar \ de \ soluto = \dfrac {10 \ g} {0.07221635 \ moles} \approx 138.473 \ g / moles[/tex]
La masa molar de la sustancia disuelta (el soluto) ≈ 138,473 g/mol
The radioactive isotope carbon-14 can be used for
A) determining medical disorders
B) controlling speeds of neutrons
C) controlling fission reactions
D) determining the age of a sample
To solve this we must be knowing each and every concept related to radioactive isotope. Therefore, the radioactive isotope carbon-14 can be used for determining the age of a sample.
What is radioactive isotope?The radioactive isotopes of such an element are called radioisotopes. They are indeed the atoms with an unstable nuclear configuration of protons and neutrons or excess nuclear energy.
A characteristic of both found naturally elements and isotopes created intentionally is radioactive decay. A radioactive element's half-life, or the amount of time it takes for one-half of any specified amount of the isotope to decay, is used to describe the rate of radioactive element decay. The radioactive isotope carbon-14 can be used for determining the age of a sample.
Therefore, the radioactive isotope carbon-14 can be used for determining the age of a sample.
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What are the two types of economic activity? Explain
Answer:
Economic activity: Activities that are related to the production and consumption of goods in return for money. The main motive is to earn money.
The economic activities are:
Primary activity: these are related to the extraction of natural resources.
Secondary activity: these are related to the processing of raw materials.
Tertiary activity: these are related to providing services.
does conduction reflect light?
Answer:
Conduction Should not have anything to do w/ Light.
Explanation:
The reason being is because Conduction is the process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.
Of four atoms bellow,which two would be in the same group? Sorry that the quality is so bad :(
If an electron goes from n=5 to n=4, is energy released or absorbed?
Answer:
The energy can be released as one quantum of energy, as the electron returns to its ground state (say, from n = 5 to n = 1), or it can be released as two or smaller quanta as the electron falls to an intermediate state, then to the ground state (say, from n = 5 to n = 4, emitting one quantum, then to n = 1,
Read the passage below and choose the best answer for the main idea of the passage:
Footprints offer clues about where we came from and where we're headed. Their impressions tell us something
about the animals that leave them. But while actual footprints offer details on size, weight and speed, carbon
footprints measure how much carbon dioxide (CO2) we produce just by going about our daily lives. A drive to work,
a flip of a light switch and a flight out of town all rely on the combustion of fossil fuels like oil, coal and gas. When
fossil fuels burn, they emit greenhouse gases like CO2 that contribute to global warming. Ninety-eight percent of
atmospheric CO2 comes from the combustion of fossil fuels.
a. Footprints come in all shapes and sizes.
C. Global warming comes from the emission of
CO2 into the atmosphere.
d. No one should be allowed to drive because
it causes global warming.
b. We study footprints to learn about the
animals who leave them.
Answer: C
Explanation:
How does genetic variation play a role in evolution? I give Brainless
Answer:
Evolution is the process by which populations of organisms change over generations. Genetic variations underlie these changes
Explanation:
If a trait is advantageous and helps the individual survive and reproduce, the genetic variation is more likely to be passed to the next generation.
Brain-List?
Iodine monochloride (ICl) has a higher boiling point than bromine (Br2) partly because iodine monochloride is a(n)
Answer: polar molecule.
Explanation:
The boiling point is the temperature at which the vapor pressure of a liquid equals the external pressure surrounding the liquid. The boiling point is dependent on the type of forces present.
Iodine monochloride (ICl) is a polar molecule due to the difference in electronegativities of iodine and chlorine. Thus the molecules are bonded by strong dipole dipole forces. Thus a higher temperature is needed to generate enough vapor pressure.
Bromine [tex](Br_2)[/tex] is a non polar molecule as there is no electronegativity difference between two bromine atoms. The molecules are bonded by weak vanderwaal forces and thus has low boiling point.
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In the picture below, click on the correct Lewis Dot Symbol for Helium.
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Im sorry what ??
Your not being specific
I NEED UR HELPPPP I HAVE TO SUBMIT IT IN 10 MINS!!!! PLEASE I HAVE NO IDEA
Explanation:
6/t1=4/293= 1750/4 =439.5-273=166.5
Create a chemical equation for "Bubbling chlorine gas through a solution of sodium bromide gives elemental bromine and a solution of sodium chloride" and balance it.
Answer:
[tex]Cl_{2} +2NaBr ---> 2NaCl + Br_{2}[/tex]
Explanation:
what are synthetic materials, how are they made, and why are they important?
Answer:
Synthetic fibers are made from synthesized polymers of small molecules. The compounds that are used to make these fibers come from raw materials such as petroleum-based chemicals or petrochemicals. These materials are polymerized into a chemical that bonds two adjacent carbon atoms.
