Answer:
A. Almost all of the mass is concentrated in the nucleus.
Explanation:
Because when he shot the alpha particles towards the atoms, most passed through (which meant atom is mostly empty space), but some bounced back and such (which meant mass is concentrated in the nucleus.)
The reason they bounced is because alpha particles are postive and nucleus is positive as well, and we know positives don't attract, rather they repel thus they bounced.
Why does carbon form covalent bonds?
Answer:
Carbon has 4 electrons in its outermost shell. ... Therefore, carbon completes its octet by sharing its 4 electrons with other carbon atoms or with atoms of other elements and forms covalent bond. It forms strong covalent bonds because of its small size.
Explanation:
Which reaction occurs at the anode of a galvanic cell that has a zinc
electrode in an electrolyte with zinc ions and a copper electrode in an
electrolyte with copper ions? The reduction potential for the reduction of Cu2+
= 0.34 V. The reduction potential for the reduction of Zn2+ = -0.76 V.
A. Zn(s) → Zn2+(aq) + 2e
B. Cu(s) → Cu2+(aq) + 2e
C. Zn2+ (aq) + 2e → Zn(s)
D. Cu2+ (aq) + 2e →
Cu(s)
Answer: The reaction that occurs at anode is [tex]Zn(s)\rightarrow Zn^{2+}(aq.)+2e^-[/tex]
Explanation:
Given : [tex]E^o_{Zn^{2+}/Zn}=-0.76V[/tex]
[tex]E^o_{Cu^{2+}/Cu}=+0.34V[/tex]
The substance having highest positive reduction potential will always get reduced and will undergo reduction reaction. Here, copper will undergo reduction reaction will get reduced.
The substance having highest negative reduction potential will always get oxidised and will undergo oxidation reaction. Here, zinc will undergo oxidation reaction will get oxidised.
Oxidation reaction occurs at anode and reduction reaction occurs at cathode.
Oxidation half reaction (anode) : [tex]Zn(s)\rightarrow Zn^{2+}(aq.)+2e^-[/tex]
Reduction half reaction (cathode) : [tex]Cu^{2+}(aq.)+2e^-\rightarrow Cu(s)[/tex]
How many molecules are there in 45 moles of diphosphorus trioxide?
Answer:
[tex]2.71(10^{25})[/tex] molecules
Explanation:
Remember 1 mol is equal to Avogadro's number
[tex]45 mol (\frac{6.02(10^{23}) molecules}{1 mol})[/tex]
How did this project prepare you to be a real meteorologist?
Which example is a long-term environmental change? La Niña El Niño climate change small asteroid impact
The correct answer is C. Climate change
Explanation:
Long-term environmental changes occur as major events affect the environment and ecosystems indefinitely. These events differ from short-term environmental changes because the effect of short-term environmental changes is mainly temporary. Also, long-term changes are usually gradual.
Climate change is an example of long-term environmental changes because this implies indefinite and major changes in weather patterns and ecosystems. For example, it is believed climate change will decrease the amount of ice in Earth, change sea level, and lead to the extinction of dozens of species. This does not occur with events such as el niño or a small asteroid impact that affect the environment for a short time and do not imply major changes.
Answer:
it is c) climate change
Explanation:
i just took the quiz
hope this helps!!! :D
Please I really really need help!!!!
1) What is Avogadro's number?
2) What is the relationship between Avogadro's number and Carbon atom?
3) What is unified atomic mass unit?
Don't answer the question for points if you don't know what it means, you will be reported!!!!
Thank you if you do :D
Answer:
1) It is the number of particles in one mole of substance. It is an arbitrary definition to denote an amount of substance, not by its weight but by its number of molecules. Why? because that is convenient when doing certain calculations involving molecule formulas.
2) 1 mole of substance contains exactly as many particles as there are atoms in 12 grams of carbon-12.
3) The unified atomic mass unit is 1/12 of the mass of 1 carbon-12 atom.
So you see all three concepts are linked together.
1. Describe potential long-term and short-term effects of exposure to chemicals.
Answer:
The answer to the question is explained below
Explanation:
A chemical is any substance or an element that can occur naturally or can be created artificially. Chemicals are found in many places like the soil, water, air. They can be found solely as an element without being combined with other elements, and they can also be found as a mixture in compounds.
Exposure to chemicals can be made possible through direct contact with the eye, broken skin. It can also be possible through Inhalation of gases, also through the mouth.
Long-term effects occur when an individual has been exposed to harmful chemicals over a long period of time, with the effect often fatal. Long-term exposure to chemicals include:
1. The weakening of the immune system
2. can cause cancer. For example, Carcinogens that cause cancer in humans, are gotten from exposures to Carbon Tetrachloride, Chloroform.
3. It can cause brain damage
4. It can lead to reproductive disorders
5. It can lead to eye damage, skin problems, and respiratory problems
Short-term effects occur when an individual has been exposed to harmful chemicals accidentally, or within a short period of time. As such, depending on the type of chemical, the amount the individual is exposed to, the effect is usually less fatal and can be addressed. Short-term exposure to chemicals include:
1. Skin or eye irritation
2. Headache
3. Nausea
4. Cough
5. Dizziness
6. Physical injuries
If the haploid number of an organism is 32 how many pairs of chromosomes would be found in each of the cells of the adult organism
Answer:
32 pairs
Explanation:
Haploid number is half of the original number (diploid) of chromosomes in somatic cells. So, if the haploid number is 32, the diploid number will be 32x2= 64.
But since 2 chromosomes pair up to form a homologous chromosome pair, the number of pairs of chromosomes found will be 32.
If the haploid number of an organism is 32, then the pairs of chromosomes that would be found in each of the cells of the adult organism is 32. The correct option is C.
What is haploid organism?The presence of a single set of chromosomes in an organism's cells is referred to as haploidy.
Diploid organisms reproduce (having two sets of chromosomes, one from each parent). Only the egg and sperm cells in humans are haploid.
Humans are diploid, with 23 chromosome pairs in the majority of cells. Human gametes (egg and sperm cells) have a single set of chromosomes and are thus haploid.
If an organism's haploid number is 32, then the number of pairs of chromosomes found in each cell of the adult organism is 32. This simply means that in pair there will 64 chromosomes, means 32 pair.
Thus, the correct option is C.
For more details regarding haploid organism, visit:
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What is chemical potential energy?
Answer:
Chemical potential energy is the energy stored in the chemical bonds of a substance.
Explanation:
Suppose of ammonium nitrate is dissolved in of a aqueous solution of sodium chromate. Calculate the final molarity of ammonium cation in the solution. You can assume the volume of the solution doesn't change when the ammonium nitrate is dissolved in it.
Answer:
Final molarity of ammonium cation in the solution = 0.16 M
Explanation:
Complete Question
Suppose 2.59 g of ammonium nitrate is dissolved in 200. mL of a 0.40M aqueous solution of sodium chromate. Calculate the final molarity of ammonium cation in the solution. You can assume the volume of the solution doesn't change when the ammonium nitrate is dissolved in it. Be sure your answer has the correct number of significant digits.
Solution
2NH₄NO₃ + Na₂CrO₄ → (NH₄)₂CrO₄ + 2NaNO₃
We first convert the given parameters to number of moles
Number of moles = (Mass/Molar mass)
Molar mass of NH₄NO₃ = 80.043 g/mol
Number of moles of NH₄NO₃ = (2.59/80.043) = 0.03224 mole
Number of moles = (Concentration in mol/L) × (Volume in L)
Number of moles of Na₂CrO₄ = 0.4 × 0.2 = 0.08 Mole
2 moles of NH₄NO₃ react with 1 mole of Na₂CrO₄
So, it it evident that NH₄NO₃ is the limiting reagent as it is in short supply in the amount needed for the reaction.
So, the number of moles of ammonium ion in the product is also 0.03224 mole.
Molarity = (Number of moles)/(Volume L)
Molarity of ammonium ion = (0.03224/0.2) = 0.1612 mol/L = 0.16 M
Hope this Helps!!!
Question: Which is the best analogy for classification? A.Classification is like setting up a phone tree in which one person calls the next two people, and those people call the next four people. B.Classification is like creating an alphabetized list of people based on their last names. C.Classification is like organizing a car wash where everyone brings needed items and then works. D.Classification is like organizing a closet by hanging clothes together based on their type, color, and season. *15 points cuz i'm low on points oof* *science NOT chemistry*
Answer:
The last one
Explanation:
When we are classifying we try to distinguish between the type, the properties just like clothes
Using the balanced equation below, how many grams of iron(iii) oxide would be required to make 187g iron Fe2O3+3CO = 2Fe+3CO2
Answer:
267.14 iron oxide.
Explanation:
Given that
[tex]Fe_2O_3+3CO = 2Fe+3CO_2[/tex]
We know that molecular mass of iron-oxide = 160 g/mole.
We know that molecular mass of iron = 56 g/mole.
From the above reaction we can say that
1 mole of iron -oxide produce 2 mole of iron
160 gm of iron oxide produce 112 gm of iron
So
1 gm of iron required [tex]\dfrac{160}{112}=1.42 gm[/tex] of iron oxide
Therefore
187 gm of iron required [tex]1.42\times = 187 = 267.14\ gm[/tex] of iron oxide.
Therefore 187 gm of iron required 267.14 iron oxide.
Answer: 267.14
Explanation:
hurry please! avogadro's law relates the volume of a gas to the number of moles of gas when temperature and pressure are constant. according to this law, how many moles of gaseous product would be produced by 2 moles of gaseous reactants if the volume of the gases doubled?
Answer:
Option B. 4 moles of the gaseous product
Explanation:
Data obtained from the question include:
Initial volume (V1) = V
Initial number of mole (n1) = 2 moles
Final volume (V2) = 2V
Final number of mole (n2) =..?
Applying the Avogadro's law equation, we can obtain the number of mole of the gaseous product as follow:
V1/n1 = V2/n2
V/2 = 2V/n2
Cross multiply
V x n2 = 2 x 2V
Divide both side by V
n2 = (2 x 2V)/V
n2 = 2 x 2
n2 = 4 moles
Therefore, 4 moles of the gaseous product were produced.
E ) The distribution coefficient , Ko ( Cether / C water ) , for an organic substance X at room temperature is 13. What relative volume of ether to water should be used for the extraction of 94 percent of X from a water solution in single extraction ?
Answer:
Relative volume of ether to water that should be used for the extraction = 1.205
Explanation:
The extraction/distribution coefficient of an arbitrary solvent to water for a given substance is expressed as the mass concentration of the substance in the arbitrary solvent (C₁) divided by the mass concentration of the substance in water (C₂).
K = (C₁/C₂)
Let the initial mass of the organic substance X in water be 1 g (it could be any mass basically, it is just to select a right basis, since we are basically working with percentages here).
If 94% of the organic substance X is extracted by ether in a single extraction, 0.94 g ends up in ether and 0.06 g of the organic substance X that remains in water.
Let the volume of ether required be x mL.
Let the volume of water required be y mL.
Relative volume of ether to water that should be used for the extraction = (x/y)
Mass concentration of the organic substance X in ether = (0.94/x)
Mass concentration of organic substance X in water = (0.06/y)
The distribution coefficient , Ko (Cether / C water), for an organic substance X at room temperature is 13.
13 = (0.94/x) ÷ (0.06/y)
13 = (0.94/x) × (y/0.06)
13 = (15.667y/x)
(x/y) = (15.667/13) = 1.205
Hope this Helps!!!
What is the best definition of chemistry?
A. The study of mass, energy, and light
B. The study of life and energy
C. The study of experiments and theories
D. The study of matter, its properties, and its reactions
why am i blonde.............
Answer:
because your parents carry the recessice gene or they are blond
Explanation:
it could also be ffrom a mutation or just because you dyed your hair
Select the correct answer.
Which of the following is a physical model of the Sun?
A.
an equation that describes the Sun's motion
В.
a chart that lists the temperatures of different parts of the Sun
C.
a computer program that shows how the Sun changes over time
D
a paragraph that describes the Sun's structure
E.
a small yellow ball that represents the Sun
Answer: E
Explanation: The ball is yellow so it can easily represent the sun
Will knows that the gravitational pull of Mars is less than the gravitational pull of Earth. When he lands on Mars, his mass will be
Answer:
i think it will "Equal to 75 Kg"
Explanation:
object/person remains same, his mass is somewhere, so it would remain same everywhere. Only Weight of a person changes with gravity
hope i helped
-lvr
How would you measure the specific latent heat of vaporisation of a liquid?
Answer:
Ramsey and Marshall method.
Explanation:
The specific latent heat of vapourization of a liquid is measured by a modification of the method of Ramsey and Marshall in the year 1896.
If a sample of Fe2S3 contains 1.25x10ˣ15 iron atoms what is the mass in grams?
Answer:
mass = 0.00000043189g
skeleton equation for
when magnesium oxide reacts with iron, iron(III) oxide and magnesium is formed
Answer:
Magnesium oxide = MgO
Iron = Fe
Iron (III) Oxide = Fe₂O₃
Magnesium = Mg
Skeleton equation = MgO + Fe ⇒ Fe₂O₃ + Mg
why is temperature not a chemical change
Answer:
Temperature is not a chemical change because when a substance changes in temperature, its chemical makeup is not changing.
1.825 gm HCl is dissolved in 250 ml solution. What is the pH of that solution? Please answer with the explanation.
The first step is calculating the number of HCl moles. The molar mass of HCl is AH+ACl which is 1+35,5=36,5 g/mole. The formula for the pH is -lg[H+] where [H+] is the molar concentration of protons in the solution. To find the molar concentration we need to divide the number of moles by the volume(L).
We get the number of moles by dividing the mass given in the problem to the molar mass of the compound.1.825/36.5=0.05 moles of HCl so 0.05 moles of
H+.Molarity=n/V=0.05/0.25=0.2moles/liter.The pH is -lg0.2=2.321.
The combustion of methane is a reaction commonly used in chemistry problems due to its ability to fit into multiple topics. So it should not surprise you to see it here as well. How many L of CO2 would be produced if 45 g of CH4 was combusted with ample oxygen in a room that was 90 degrees Celsius and under 1 atm of pressure
Answer:
20.76 L OF CO2 WILL BE PRODUCED BY 45 G OF METHANE.
Explanation:
Equation of the reaction:
CH4 + 02 --------> CO2 + 2H20
Molar mass of methane = ( 12+ 1*4) g/mol = 16 g/mol
Calculate the number of moles present in 45 g of methane
1 mole of methane = 16 g / mol of methane
(45 / 16) mole of methane = 45 g of methane
= 2.8125 moles
Using the ideal gas equation:
PV = nRT
P = 1 atm
n = 2.812 moles
T = 90 C
R = 0.082 L atm/ mol C
V = unknown
So we have:
V = nRT / P
V = 2.8125 * 0.082 * 90 / 1
V = 20.756 L
In the production of CO2 by 45 g of methane, 20.756 L of methane was used.
Then, the volume of CO2 produced by this volume will be 20.756 L since 1 mole of methane produces 1 mole of CO2.
In other words;
1 mole of CH4 = 1 mole of CO2
22.4 dm3 of CH4 = 22.4 dm3 of CO2
20.76 DM3 = 20.76 dm3
The volume of CO2 produced will therefore be 20.76 L
what is the name of this compound??
Canthomythisphere
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Which statement accurately describes tectonic plate movement? A)Tectonic plate movement can be prevented with planning. B)Tectonic plate movement does not cause environmental change. C)Tectonic plate movement does not affect organisms. D)Tectonic plate movement is a long-term environmental change.
Answer: I wanna say D because pangea was tectonic plates that moved and reshaped the earth
Explanation:
I hope that helps
Answer
D on edge
Explanation:
Which is NOT a control in the following experiment?: An experiment was performed to determine how the amount of coffee grounds could affect the taste of coffee. The same kind of coffee, the same coffee maker, the same amount and type of water, and the same electrical sources were used. While experimenting, the scientists notes that the more coffee grounds there were, the longer it took to brew.
Answer:
The same kind of coffee, the same coffee maker, the same amount and type of water, and the same electrical sources were used.
Explanation:
Polarity of water. Which is the correct answer?
10. Write the word equation of the following skeleton equation.
CuCl(aq) + NaOH(aq) → Cu(OH),(s) + NaCl(aq)
Indicate the state of each substance in your word equation.
Someone help me out please
Answer:
See below.
Explanation:
Aqueous copper chloride reacts with sodium hydroxide aqueous solution to give a precipitate (solid) of copper hydroxide and aqueous sodium chloride.
heterogeneous non example
Heterogeneous 'mixtures' (because they don't meet the definition of mixtures) are mixtures substances that aren't completely uniformly spread out. They haven't reacted with the solvent to become a solution.
Explanation: There are 2 types of heterogeneous solutions, A Colloid and a suspension.
Colloid: You can check if a mixture is heterogeneous by passing a light ray through it. This may cause the Tyndall effect (If the mixture is a colloid) when the Colloidal Heterogeneous mixture's particles are so small that they refract the beam of light and the path of light will be visible, like if you add 3 drops of milk in a glass of Water and shine a laser light through it. This is because the particles are too small to be seen by the unaided eye but big enough to scatter you laser light. However that particles won't settle down or will be separated by a filter paper due to particles' small size.
Suspension: A solution will be a solution when the particles of the Mixture is big enough to be seen by the unaided eye. Like if you mix sand and Water, the sand will eventually settle down due to Gravity. The mixture's solute will be big enough to pass through a filter paper.