Which models of the atom in task 1 are not supported by the results of the hydrogen gas experiment? For each of these models, explain the experimental results that the model would predict.
Answer:
Thomson placed two magnets on either side of the tube, and observed that this magnetic field also deflected the cathode ray. The results of these experiments helped Thomson determine the mass-to-charge ratio of the cathode ray particles, which led to a fascinating discovery, minus the mass of each particle was much, much smaller than that of any known atom. Thomson repeated his experiments using different metals as electrode materials, and found that the properties of the cathode ray remained constant no matter what cathode material they originated from. From this evidence, Thomson made the following conclusions:
The cathode ray is composed of negatively-charged particles.
The particles must exist as part of the atom, since the mass of each particle is only ~1/2000 the mass of a hydrogen atom.
These subatomic particles can be found within atoms of all elements.
While controversial at first, Thomson's discoveries were gradually accepted by scientists. Eventually, his cathode ray particles were given a more familiar name: electrons. The discovery of the electron disproved the part of Dalton's atomic theory that assumed atoms were indivisible. In order to account for the existence of the electrons, an entirely new atomic model was needed.
Explanation:
Use the chemical equation to complete the activity.
4Fe + 3O2 → 2Fe2O3
Iron (Fe) reacts with oxygen (O2) to form iron oxide. A scientist adds 15.4 grams of Fe to 3.6 grams of O2 to start the reaction. All of the iron and oxygen react to form iron oxide. Explain in detail how you can determine how many grams of iron oxide will be produced.
Use the law of conservation of matter in the explanation.
Answer:
14.54 g Fe2O3
Explanation:
The first step would be to balance the equation but since it's already balanced we don't have to worry about that.
Through the balanced equation, you can find the stoichiometry of the reaction, that is:
4 moles of Fe, react with 3 moles of O2, to produce 2 moles of Fe2O3
Chemistry (accurately stoichiometry) is all about ratios and proportions. The balanced equations gives you the standard ratio by which moles are produced.
So the next step (shown in the paper), is to convert the grams that are giving you in Moles, and you do this by dividing the number of grams given by the molar mass of the substance. The molar mass is the number of grams by which you can find exactly 6.022x10²³ molecules (one mole) of one specific substance.
15.4 g of Fe= 0.28 mol Fe
3.6 g of O2= 0.11 mol O2
Now that you have the quantity of moles, what you need to do is to look for the limitant reactant.
In a balanced equation, the number of moles in the reactants are the rules and they're gonna react completely with each other. If you want x quatity of reactants to react completely, then you will have to respect the proportion to the ratio given in the balanced equation.
But you will rarely follow the proportion so there will usually be a reactant that's gonna be limiting the reaction and one that is in excess. And how do you find this? Well, the easiest way to do it is:
Dividing the number of moles obtained by x element the coefficients of that element in the balanced equation. The one that has the smallest ratio, is the limitant reactants.Since the limitant reactant is gonna be limiting the reaction, all the stoichiometric procedures should be calculated through it, and in this case, the limitant reactant is O2.
But then how to establish the stoichiometric rule to find the number of Iron oxide (III) that's being produced?
Look back to the stoichiometry of the reaction:
To produce 2 moles of Fe2O3, you need 3 moles of O2.
But you have 0.11 mol O2.
Then establish a factor of conversion (shown in the picture)
The result is 0.07 mol of Fe2O3, but you need the answer in grams so you find the molar mass of Fe2O3 and then multiply it by the number of moles (0.07)
The answer is 14.54 g of Fe2O3
CHEMISTRY IS ALL ABOUT PROPORTIONS :D
Definition for starch in science ?
Answer:
Starch is a polysaccharide comprising glucose monomers joined in α 1,4 linkages. orStarch is a long-chain polymer of glucose molecules joined together. orA starch is a complex polysaccharide made up of a large number of glucose units joined together by glycosidic bonds.Explanation:
starch, a white, granular, organic chemical that is produced by all green plants. Starch is a soft, white, tasteless powder that is insoluble in cold water, alcohol, or other solvents.
Starch is amongst the most abundant plant products and is a mixture of two polymers, amylose and amylopectin. During food processing starch is transformed by hydrothermal treatments. ... The structure of starch is also influenced by specific and non-specific interactions with other food constituents and ingredients.
Pls Help Me (20 Points)
In one to two sentences, describe an experiment that would show that intramolecular forces (attractions between atoms within molecules) are stronger than intermolecular forces (attractions between molecules).
Answer:
If the molecules have similar molar masses and similar types of intermolecular forces, look for the one that is the most polar or that has the most electronegative atoms or the most hydrogen bonding groups. That one will have the strongest IMF's overall.
Explanation:
An experiment that would show that intramolecular forces are stronger than intermolecular forces will be heating a block of ice in a sealed container then allowing it to change to steam.
Intramolecular forces are the forces of attraction that hold atoms together within a molecule. Intramolecular forces require a high amount of energy to splits atoms or molecules in a chemical bonding.
Intermolecular forces are weaker forces of attraction that occur between molecules. They require lesser energy to splits molecules compared to intramolecular forces.
An experiment that show that intramolecular forces are stronger than intermolecular forces will be heating a block of ice in a sealed container then allowing it to change to steam.
In the process, the energy required to change the state from ice to steam water is more than intermolecular forces.
Thus, we can conclude that this experiment shows that the intramolecular forces are stronger than the intermolecular forces.
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After the first four games of a professional football season, three players scored a total of 80 touchdowns. Duke Johnson scored 14 of the touchdowns. Josh McCown scored 40% of the touchdowns. Andre Roberts scored the remaining touchdowns. How many touchdowns did Andre Roberts score?.
The number of touchdowns scored by Andre Roberts = 34 touchdowns
Given data :
Total number of touchdowns = 80
Number of players = 3
Determine the number of touchdowns scored by Andre RobertsPlayer 1 ( Duke Johnson ) scored = 14
Player 2 ( Josh McCown ) scored = 40% of 80 = 32
∴ number of touchdowns scored by player 3 ( Andre )
= 80 - ( 14 + 32 )
= 80 - 46 = 34 touchdowns
Hence we can conclude that the number of touchdowns scored by Andre is 34 .
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If a sample of gas at constant temperature has its pressure doubled, what will happen to its volume?
Answer:
it'll halve
Explanation:
the gas is compressed with twice the pressure. The volume will be halved.
im certain
Given the equation
N2(g) +3H2 (g)--> 2NH3 (g)
1 mole of N2 gas is needed to completely react with 3 moles of H2 gas.
How many molecules of H2 gas are needed?
Answer:
1.81 x [tex]10^{24}[/tex] molecules H2
Explanation:
Use Avogadro's number:
3 moles H2 x 6.022 x [tex]10^{23}[/tex] molecules= 1.81 x [tex]10^{24}[/tex] molecules H2
a sample osoxooso sixisoxoso
Answer:
I believe the correct answer is A.
Explanation:
He atoms are smaller than Ne atoms (4AMU vs 20AMU). Although the kinetic energy and concentrations are the same (same temperature and each have 0.5 mole in 10.0L containers), the kinetic energy is a product of mass and velocity. Since the Ne mass is greater, it will have a lower speed, thus taking longer to bounce out the pinhole.
Where are nonmetals located in the periodic table?
Question 8 options:
along the upper left side
in the middle
along the upper right side
along the bottom
Answer: They are located along the upper right side of the periodic table.
Explanation: Malleability is a physical property that some elements of matter have that can be broken down into sheets to give them a certain shape without breaking. This physical property belongs to plasticity. It is a characteristic that some metals have, sheets of said metal can be obtained. The heat needs to be increased, some examples are gold, platinum, zinc, tin, etc.
Sodium has more valence electrons than magnesium.
True
False
Correct answers only please, no links. (15 points)
Answer:
False
Explanation:
hi! sodium has one valence electron while magnesium has 2. this is because of their position on the periodic table. sodium is the first in the row, meaning it has one valence electron. magnesium is next to sodium on the periodic table, meaning it is second in the row and has two valence electrons. hope this helps!
Methane has the chemical formula of CH4 and would, therefore, it would be
considered...
Answer:
compound
Explanation:
A compound contains more than one element.
Methane's chemical formula (CH4) indicates that it consists of one carbon atom and four hydrogen atoms.
Therefore, methane is a compound.
which type of bonding is found in all substances made up of molecules?
Answer:
Chemical bonds
Explanation:
Chemical bonds are forces that hold atoms together to make compounds or molecules. Chemical bonds include covalent, polar covalent, and ionic bonds. Atoms with relatively similar electronegativities share electrons between them and are connected by covalent bonds.
In a bond between silicon (Si) and chlorine (CI), (answer here) will be more electronegative. A. silicon B. chlorine
Answer:
Chlorine
Explanation:
Chlorine has a valence shell of 7 electrons and chlorine is smaller in size, so it has a stronger pull/attraction on the electrons than Silicon.
the mass number of an element whose atoms contain 18 protons, 22 neutrons and 18 electrons
Answer:
Argon has the chemical formula Ar. Argon has 18 protons and 22 neutrons in its nucleus giving it an Atomic Number of 18 and an atomic mass of 40. Argon is a Noble Gas. Argon is a gas at room temperature.
Explanation:
Claim-Evidence-Reasoning
Question: Does the diagramed chemical equation above obey the Law of
Conservation of Matter?
Answer:
matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions.
Explanation:
Write the complete electron configuration using the diagonal rule for strontium.
Use this oxidation-reduction reaction to answer questions about half-reactions:
Upper m g plus 2 upper H upper C l right arrow upper M g upper C l subscript 2 plus upper H subscript 2.
Classify these half-reactions by typing in “O” for “oxidation half-reaction,” “R” for “reduction half- reaction,” and “N” for “neither.”
Answer:
For those who need it, the answers are N, O, R
Explanation:
To solve such this we must know the concept of redox reaction. Therefore, the given reaction is an oxidation and reduction reaction. The oxidation reaction is Mg [tex]\rightarrow[/tex] MgCl[tex]_2[/tex] and reduction reaction is HCl [tex]\rightarrow[/tex] H[tex]_2[/tex] .
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
Redox reaction is a chemical reaction where oxidation and reduction takes place simultaneously. Oxidation is loss of electrons and reduction is gain of electrons. The electron transfer from oxidant to reductant.
Mg + 2HCl [tex]\rightarrow[/tex] MgCl[tex]_2[/tex] + H[tex]_2[/tex]
Mg [tex]\rightarrow[/tex] MgCl[tex]_2[/tex] O
HCl [tex]\rightarrow[/tex] H[tex]_2[/tex] R
Therefore, the given reaction is an oxidation and reduction reaction.
Learn more about the chemical reactions, here:
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Why does potassium have a lower electronegativity than Bromine?
Potassium has a lower EN than Bromine.
EN Trends:
Decreases down the group but increases across a period.
Potassium is to the left of the periodic table while bromine is on the right, and according to the trends, Bromine will be bigger because EN increases across a period. This allows the nucleus to attract the bonding electrons more strongly.
Hope it helps!
Read this sentence from Chapter One of Jack London’s The Call of the Wild.
Buck rushed at the splintering wood, sinking his teeth into it, surging and wrestling with it. Wherever the hatchet fell on the outside, he was there on the inside, snarling and growling, as furiously anxious to get out as the man in the red sweater was calmly intent on getting him out.
What is a good prediction question to ask after reading this excerpt?
Answer:
b)
Explanation:
It shows the natrual proggresion of a story and helps blend the narrtive together.
Answer:B
Explanation: i took the quiz on edge
2NaOH(aq) + Cl2(g) -> NaCl(aq) + NaClO(aq) + H20(l)
Answer:
Cl2(g) + 2 NaOH(aq) = NaCl(aq) + NaClO(aq) + H2O(l)
Explanation:
F
norm
app
F
grav
F
fric
Which statement is true in this situation?
A. The size of Ffric is the same as the size of Fgrav-
B. The size of Fnorm is the same as the size of Ffric
C. The size of Ffric is the same as the size of Fapp:
D. The size of F
app is the same as the size of Fgrav
The statement is true in this situation is C. The size of Ffric is the same as the size of Fapp:
From the diagram, since the body is in equilibrium, the sum of vertical forces equals zero. Also, the sum of horizontal forces equal zero.
So, ∑Fx = 0 and ∑Fy = 0
Since Fapp acts in the negative x - direction and Ffric acts in the positive x - direction,
∑Fx = -Fapp + Ffric = 0
-Fapp + Ffric = 0
Fapp = Ffric
Also, since Fgrav acts in the negative y - direction and Fnorm acts in the positive y - direction,
∑Fy = Fnorm + (-Fgrav) = 0
Fnorm - Fgrav = 0
Fnorm = Fgrav
So, we see that the size of Fapp equals size of Ffric and the size of Fnorm equals the size of Fgrav.
So, the correct option is C
The statement which is true in this situation is C. The size of Ffric is the same as the size of Fapp.
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In a laboratory, a student combines vinegar and baking soda into a beaker. The initial temperature is 28 degrees Celsius and the final temperature reading two minutes later is 20 degrees Celsius.
1. What happened to the heat in the surroundings?
2. Did an endothermic or exother mic reaction occur
The reaction is endothermic because the temperature dropped from 28 degrees Celsius to 20 degrees Celsius.
Meaning of endothermic and exothermic reaction:An endothermic reaction is one in which heat is absorbed from the surrounding resulting in decrease in temperature while an exothermic reaction is one in which heat is evolved causing the temperature to rise.
In the particular context of this question, the reaction is endothermic because the temperature dropped from 28 degrees Celsius to 20 degrees Celsius. The heat in the surroundings decreased.
Learn more about endothermic reaction: https://brainly.com/question/2192784
the product of 13cm and 5.7cm is correctly reported as
a. 75cm^2
b. 74.0cm^2
c. 74 cm^2
d. 74.1 cm^2
Answer:
d] 74.1 cm²
Explanation:
Product means that the values given must be multiplied.
13 cm × 5.7 cm = 74.1 cm²
how to tell if an electron will make a cation or anion
PLEASE HELP ME ON THIS
Answer:
The conductance will increase as the concentration of the electrolyte is increased.
Explanation:
The ions are what carry the charges from one electrode to another. The more there are, the easier it is for electrons to get across the solution of electrolyte,
What is Nuclear fusion
Answer:
Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles (neutrons or protons).
In chemistry class, you are given a density column with 3 liquids (shown in the
image). A small sample of beryllium (a metal) with a mass of 2.8 grams and a volume
of 1.5 mL is added to the column. Where would the metal sample be located in the
column?
Answer:
A)
Explanation:
HELP!!!!
Which of the following has the smallest electron affinity?
а К
b Ca
C Li
d Na
e Mg
Answer:
e. Mg.
Explanation:
Answer:
[tex]mg[/tex]
is the answer to your question
why don't elements in a group have consicutive atomic numbers?
Answer:
Periods have consecutive atomic number as they are in a row and groups are vertical meaning they are in a column and groups have similar properties
Draw the Complete Electron Energy Level Diagram (or the Orbital Diagram) for Ru+3
Answer:
A
Explanation:
refer to textbook