Scientists used alpha particles to investigate models of the atom. Figure 4 shows an alpha particle scattering experiment.
Explain how scientists used the results from the experiment to :
disprove the plum pudding model
give evidence for the new nuclear model
Answer:
See attached image.
Explanation:
When in contact with hydrochloric acid, which mineral gives off bubbles of carbon dioxide gas?.
Answer:
Calcite
Explanation:
When in contact with hydrochloric acid, calcite releases carbon dioxide gas.
what is the percent composition of each element within the compound
Answer:
The percentage composition of a given compound is defined as the ratio of the amount of each element to the total amount of individual elements present in the compound multiplied by 100. Here, the quantity is measured in terms of grams of the elements present.
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A student spilled a bottle of ammonia in one corner of the laboratory. Soon the whole laboratory was felled with pungent irritating small. The students immediately opened the windows and doors and switched on the exhaust fans. After sometime, students got relief. Explain what did actually happen?
Answer: Initially when the student spilled the bottle of ammonia the ammonia gas particles diffused with the particles of air in the room. We know that the rate of diffusion of gases is very high. So the entire room filled up with the pungent smell of ammonia.
When he opened the doors and windows and switched on the exhaust fan, the air from the room along with the ammonia gas diffused with the air outside the room.Moreover, outside air entered into the room so the concentration of ammonia gas in the room air reduced.Due to these reasons the student got relief.
PLEASE HELP FAST! When 23.3 g of O2 reacts with 18.3 g C10H8, what is the limiting reactant. The equation is C10H8 + 12O2 --> 10CO2 + 4H2O?
Choices:
A. C10H8
B. O2
C. CO2
D. H2O
Answer:
B
Explanation:
The answer is B, O2
O₂ is the limiting reagent.
What is a limiting reactant?A limiting reactant is described as the one that will be consumed first in a chemical reaction.
CalculationC₁₀H₈ + 12O₂ → 10CO₂ + 4H₂O
Given, Mass of O₂ = 23.3 g
Mass of C₁₀H₈ = 18.3 g
Molar mass of O₂ = 32 g
No. of moles of O₂ = 32/23.3 = 1.4 moles
Molar mass of C₁₀H₈ = 128 g
No. of moles of C₁₀H₈ = 128/18.3 = 6.9 = 7 moles
According to the equation,
1 mole of C₁₀H₈ yields 10 moles of CO₂. So, 7 moles of C₁₀H₈, give 70 moles of CO₂.
12 moles of O₂ yields 10 moles of CO₂. So, 1.4 moles of O₂ give 1.16 moles of CO₂.
We do know, however, that based on our balanced equation, if we were to totally react all 1.4 moles of O2, we could only produce a maximum of 1.16 moles of CO2. Even while there is enough C10H8 to generate more, the amount of O2 we have is a limiting factor because it will be consumed first.
So, our limiting reactant is O₂.
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Which chemical name is correctly paired with the chemical formula?
tin(IV) bromide, SnBr4
aluminum fluorate, AlF3
iron(II) oxide, Fe2O3
potassium chloride, K2Cl2
Answer:
Tin bromine = Snbr2
aluminum fluorate = AlFe3
iron oxide = Fe2o3
potassium chloride = KCL or 2KCL = K2CL2
All Pairs are correct
The greatest progress in reducing atmospheric levels of lead pollution resulted from Group of answer choices the switch from lead to graphite in pencils. new types of lead scrubbers on smokestacks that removed lead from the air. the development of new types of batteries that use lithium instead of lead. the elimination of leaded gas.
The greatest progress in reducing atmospheric levels of lead pollution resulted from the elimination of leaded gas.
What is atmospheric lead pollution?Atmospheric lead pollution refers to the presence of lead particles in the atmosphere.
Lead is a pollutant which affects the respiratory system.
Fuels that contains lead when burned releases lead into the atmosphere.
Therefore, the greatest progress in reducing atmospheric levels of lead pollution resulted from the elimination of leaded gas.
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The Oxidation number of iron in the Complexion [Fe(CN) 6]³^- is what?
+3
Hence, the magnetic behaviour of the complex is paramagnetic. The oxidation number of the central metal atom: The oxidation number of the metal iron is +3.
Answer:
the oxidation number of iron in the complexion is +3 or x=+3
Which of the following is a ketone?
Answer:
b
Explanation:
b is the ketone because it is and that's a fact
Answer:
D
Explanation:
Ketones are a class of organic compounds that have an Oxygen double bonded to the middle of the main carbon chain.
Option A is not a ketone (despite having an Oxygen double bonded to the middle of the main carbon chain) because it has an adjacent single bonded Oxygen in the main carbon chain. This type of compound is classified as an "Ester".
Option B is not a ketone, but is instead classified as an aldehyde, a group of compounds with their Oxygen double bonded at the end of the main carbon chain.
Option C is not a ketone (despite having an Oxygen double bonded to the middle of the main carbon chain), but is instead classified as an Carboxylic Acid, because it has an adjacent single bonded Oxygen in the main carbon chain, and both of these pieces (with the single bonded O pointing outward) are at the end of the main carbon chain.
Option D is a ketone because it does have an Oxygen double bonded somewhere to the middle of main carbon chain, not at an end, and not with another Oxygen single bonded adjacently in the carbon chain. Specifically, this ketone is "2-pentanone" or "methyl propyl ketone"
From 200 mg of CO₂, 1021 molecules are removed. How many molecules of CO₂ are left?
Answer:
CO_(2)` molecules removed `= 10^(21)` <br> No. of `CO_(2)` molecules left `= 2.74 xx 10^(21) - 10^(21) = 1.74 xx10^(21)` <br>
Explanation:
does anyone understand these?
Answer:
6) 47588
4.7 * 10 power 4 ( by rounding off)
7) 1 mm ---> 1,000,000
? 120
120 * 1 / 1000000
12/ 100000
0.0012
1.2 * 10 power -4.
8) Volume is the amount of space something occupies
CaCO3(s) CaO(s) + CO₂(g)
4
3.25 mol CaCO3 decomposes
according to the reaction above.
What volume of CO2 gas is
produced once the gas cools to
STP?
N₂(g) + 3H₂(g) → 2NH3(g)
224 L of nitrogen reacts with
excess hydrogen at 2773 K and
95.0 atm. How many moles of
nitrogen react?
Answer:
93.5 moles N₂
Explanation:
To find the moles, you need to use the Ideal Gas Law. The equation looks like this:
PV = nRT
In this equation,
-----> P = pressure (atm)
-----> V = volume (L)
-----> n = number of moles
-----> R = constant (0.0821 atm*L/mol*K)
-----> T = temperature (K)
You can plug the given values into the equation and simplify to find moles. The final answer should have 3 sig figs to match the lowest number of sig figs among the given values.
P = 95.0 atm R = 0.0821 atm*L/mol*K
V = 224 L T = 2773 K
n = ?
PV = nRT
(95.0 atm)(224 L) = n(0.0821 atm*L/mol*K)(2773 K)
21280 = n(227.6633)
93.5 = n
Answer:
93.5 moles N₂
Explanation:
You can plug the given values into the equation and simplify to find moles. The final answer should have 3 sig figs to match the lowest number of sig figs among the given values.
P = 95.0 atm R = 0.0821 atm*L/mol*K
V = 224 L T = 2773 K
n = ?
PV = nRT
(95.0 atm)(224 L) = n(0.0821 atm*L/mol*K)(2773 K)
21280 = n(227.6633)
93.5 = n
Explanation:
Energy associated with the flow of electrons is?
Answer:
Electric current
Definition:
The time rate of flow of electric charge, in the direction that a positive moving charge would take and having magnitude equal to the quantity of charge per unit time: measured in amperes.
Electricity is the flow of electrons. Where do these electrons come from? How are they put into circulation and what happens to them?Everything begins inside in the battery. The battery's zinc metal undergoes oxidation; here is where the flow of electrons into the conductors begins. Electrical field attraction will lead the wire's existing electrons to move towards the battery's positive terminal, and the loose electrons caused by the zinc metal will begin to fill the wire's empty spaces. process continues until the zinc metal's oxidation ceases. At rechargeable batteries, the oxidation-reduction process is also reversed by charging the battery, allowing the stored electrons in the positive terminal to flow back to the zinc metal's negative terminal.
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10 uses of metals in daily life
Answer:For jewellery and ornaments, gold, platinum and silver are being used.
For building purposes, iron and steel can be used.Iron and aluminium are used as utensils.
The thermometer uses mercury and helps to monitor the temperature.
The insulation wires are made of aluminium.
Aluminium foils are being used as wrappers for food.In sweets, a silver foil is being used.
To avoid rusting, zinc is used for galvanizing.In vehicles, iron is being used.
For making cable wires, copper is being used.
Explanation:
Answer:
1. For jewellery and ornaments, gold, platinum and silver are being used.
2. For building purposes, iron and steel can be used.
3. Iron and aluminium are used as utensils.
4. The thermometer uses mercury and helps to monitor the temperature.
5. The insulation wires are made of aluminium.
6. Aluminium foils are being used as wrappers for food.
7. In sweets, a silver foil is being used.
8. To avoid rusting, zinc is used for galvanizing.
9. In vehicles, iron is being used.
10. For making cable wires, copper is being used.
If 19.4 mL of a Ca(OH)₂ solution are needed to neutralize 31.5 mL of 0.1 M HC₂H302 solution, what is the concentration (molarity) of the
Ca(OH)₂ solution?
Select one:
O a. 0.009 M
O b. 1.6 M
OC 0.08 M
O d. 0.1 M
The concentration (molarity) of the Ca(OH)₂ solution needed to neutralize 31.5 mL of 0.1 M HC₂H302 solution is 0.162M (option D).
How to calculate molarity?The molarity of a solution can be calculated using the following formula:
CaVa = CbVb
Where;
Ca = concentration of acidCb = concentration of baseVa = volume of acidVb = volume of base31.5 × 0.1 = 19.4 × Cb
3.15 = 19.4Cb
Cb = 0.162M
Therefore, the concentration (molarity) of the Ca(OH)₂ solution needed to neutralize 31.5 mL of 0.1 M HC₂H302 solution is 0.162M.
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Which of the following could have been formed by reacting iron with sulfur?
A. Iron oxide
B. Sulfuric iron
C. Iron sulfide
D. Sulfuric acid
Answer: C
Explanation:
iron sulfide.
Answer:
C. Iron sulfide
Explanation:
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Which is not a characteristic of a compound?
has different properties from its component elements
different samples have different properties
can be represented by a chemical formula
a pure substance made of two or more elements
How many moles FeBr3 are required
to generate 275 g NaBr?
2FeBr3 + 3Na₂S → Fe₂S3 +6NaBr
Answer:
0.893mol
Explanation:
n = m ÷ M
= 275 ÷ (23 + 80)
= 2.67 mol
* now use the Mol ratio *
NaBr : FeBr3
6 : 2
2.67 : x
5.67 = 6x
n( FeBr3 ) = 0.893 mol
10. What are the four steps in the scientific method?
if earth has an oxidizing environment, what would you expect to happen to if left to sit over time?
If the earth is completely an oxidizing atmosphere, materials would ignite spontaneously when they are exposed to air.
What would happen if the earth is an oxidizing environment?Let us recall that oxidation has to do with an increase in oxidation number. If the earth is left as an oxidizing atmosphere without any attenuation, we can not have pure substances.
Secondly, materials would ignite spontaneously when they are exposed to the oxidizing atmosphere of the earth.
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which experimental technique was most likely used by the students to determine the rate of reaction?
The most common way to monitor the rate of reaction is by observing the increase in the absorbance of the solution.
What is the rate of reaction?The rate of reaction is the rate at which reactants are converted into products or the rate at which the reactants disappear.
Given that the reaction is a colorimetric reaction, the most common way to monitor the rate of reaction is by observing the increase in the absorbance of the solution.
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Please help, need it for homework
Answer:
n
Explanation:
nobody knows
Eric pours some iced tea into a glass. When he puts the iced tea in the glass, the energy of the glass decreases. What must be true of the energy of the iced tea?
Iced tea's energy increases while the energy of the glass decreases.
What is energy?Energy is the capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other forms
Iced tea's energy increases while the energy of the glass decreases because the ice is getting warmer so the glass is also getting warmer. meaning that the glass is decreasing in energy while the ice tea is increasing in energy.
Hence, iced tea's energy increases while the energy of the glass decreases.
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the hemiacetal below is treated with 18o-labeled methanol (ch3o*h) and acid. where will the label appear in the products?
The label appears in the organic product and not in the water owing to the fact that water is eliminated as -OCH3 replaces -OH.
What is a labeled reaction?Isotopic labelling is one of the methods by which a chemical reaction is studied. In this case, we can see that the reaction occurs with the hemiacetal reacting with a labeled methanol.
By looking at the reaction products we can see that the label appears in the organic product and not in the water owing to the fact that water is eliminated as -OCH3 replaces -OH.
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What temperature, in Kelvin, does a 1.00 gram sample of Ne in a 2.50 L container need to be adjusted to in order to bring the pressure to 1.00 atm? Report your answer to the nearest Kelvin. (Moodle is looking for a number only, no units.)
The temperature of 0.049 moles of a Ne with a pressure of 1.00 atm and a volume of 2.50 L is 621.44K.
How to calculate temperature?The temperature of a given gas can be calculated using the ideal gas law equation:
PV = nRT
Where;
P = pressure = 1.00 atm
V = volume =2.50 L
R = gas law constant = 0.0821 Latm/molK
Mass =1.00 gram
The molar mass of Ne= 20.1797 u
[tex]Moles = \frac{mass}{molar \;mass}[/tex]
[tex]Moles = \frac{1.00}{20.1797}[/tex]
Moles = 0.049mol
T = temperature=?
Putting the value in the equation:
PV = nRT
1.00 atm × 2.50 L = 0.049mol × 0.0821 × T
T = 621.44K
Therefore, the temperature of 0.049 moles of a Ne with a pressure of 1.00 atm and a volume of 2.50 L is 621.44K.
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ls zinc qnd hydrogen chloride combining into sinc chloride and hydrogen gas a chemical or physical change?
Answer:
chemical because it turned into a new compound
Explanation:
is zinc and hydrogen chloride combining into zinc chloride and hydrogen gas a chemical or physical change?
physical change is like boiling, melting, freezing, and shredding
but its still the same compound
chemical is like it turns into something else like a new compound
Zn + 2HCl = ZnCl2 + H2(g)
Metal + Acid → Hydrogen + Acid Anion
new compound forms in this reaction
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Les McLean
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Fluorite is..
a. harder than apatite but softer than calcite
b. harder than gypsum but softer than apatite
c. harder than calcite but softer than feldspar
d. harder than feldspar but softer than apatite
Fluorite is harder than gypsum but softer than apatite. Thus, the correct option is B.
What is the hardness of any element?The hardness of any element may be defined as the capability of a material to oppose the process of deformation and remains in actual shape precisely.
According to the table of hardness scales by Mohs, the increasing order of given hardness of given elements is as follows:
Gypsum < Fluorite < Apatite.
Therefore, Fluorite is harder than gypsum but softer than apatite. Thus, the correct option is B.
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In a chemical reaction occurring in an open beaker, the reactants have a mass of 10.0 g and contain 1000 J of energy. The products in the beaker contain a mass of 5.0 g and 500 J of energy. Which best explains the difference in energy and mass as reactants are converted to products?
kinetic energy
closed systems
law of conservation of energy
electromagnetic energy
This happens because the beaker is open.
The Law of Mass Conservation says that in a close system all the mass and energy should be the same.
If the system is open, as in the case, we can have loss of mass, due to formation of gas, that will leave the beaker to the environment, and we can also have loss of energy, because the system will exchange the energy, as heat, with the environment, causing a loss on the total energy.
Answer:
Its C its C its C
Explanation:
i dislike expert verifeid beacause he wont say C
PLEASE HELP FAST! What is the percent yield if 0.856 g of NO is actually obtained in the lab during the following reaction: 4NH3 + 5O2 --> 4NO + 6H2O . 6.3 g of Ammonia was reacted with 1.8 g of Oxygen?
Options:
A. 20.1%
B. 53.5%
C. 89.4%
D. 63.4%
The percent yield of the reaction is 63.4%; option D
What is percent yield?Percent yield of a reaction is given as:
Percent yield = actual yield/expected yield * 100 %Actual yield of the reaction = 0.856 g
Expected yield = 1.8/32 * 4/5 * 30 = 1.35 g
Percent yield = 0.856/1.35 * 100 % = 63.4 %
Therefore, the percent yield is 63.4%.
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