12. Which nonmetal is the most reactive?
A bromine
B
iodine
C) fluorine
D) chlorine
Answer:
C Fluorine
Explanation:
4. Completa el texto con las siguientes palabras del listado. La contaminación por ? Es una alteración ? Que destruye la vegetación, ? Y el suelo y afecta el ? , es el resultado de la quema de ? Y gases industriales nocivos.
Answer:
Actividades humanas y vida marina.
Explicación:
La contaminación ocurre por actividades humanas que se considera una alteración en el medio ambiente. Esta contaminación provocada por el ser humano puede destruir la vegetación, el suelo y afectar negativamente a la vida marina. Esta destrucción que se produce en el medio ambiente es el resultado de la quema de combustibles fósiles que liberan gases industriales nocivos en la atmósfera por lo que si queremos proteger nuestro medio ambiente de mayores daños tenemos que reducir las actividades que provocan la liberación de gases nocivos en la atmósfera. .
Which part of the Earth system contains most of the planet's mass?
Answer:
Geosphere of the Earth system contains most of the planet's mass.
Explanation:
One of the most important is the Carbon Cycle since all of the organisms on Earth are carbon-based life forms. includes all water on the surface of the earth oceans, lakes, rivers, aquifers, and ice. 70% of the earth's surface is covered with water.
Which of the following is an example of nuclear fission?
A. A gamma emitter is used to trace movement of chemicals in the
environment.
B. A radioactive drug that emits electrons is used to treat cancer in a
patient.
O c. Two different isotopes of hydrogen form an isotope of helium on
the sun.
O D. A large radioactive atom breaks into smaller atoms, producing
nuclear energy.
The statement which is an example of nuclear fission is that a large radioactive atom breaks into smaller atoms, producing nuclear energy.
What is nuclear fission?Nuclear fission is a kind of radioactive decay reaction in which an unstable nuclei of an atom will split into smaller stable nuclei by the emission of lots of energy.
Gamma emitter is used inside the human body to trace the information that assists in making a diagnosis by the help of medication.To treat cancer patient high energetic rays like x-rays, gamma-rays are used.Formation of isotope of helium from two different isotopes of hydrogen is an example of nuclear fussion reaction.Hence in nuclear fission a large radioactive atom breaks into smaller atoms, producing nuclear energy.
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round 5,239 to 2 significant figures
Answer:
5240
Explanation:
I'm not sure tho sorry
Concentrations-
How many moles of HCI are present in 562.0 ml of a 6.17 M HCI solution?
If possible, show work.
Identify the atom oxidized, the atom reduced, the oxidizing agent, and the reducing agent. 2Fe + 3V2O3 -------> Fe2O3 + 6VO
Explanation:
Fe- reducing agent (since it is oxidized to fe203)
v203- oxidizing agent(since it is reduced)
In the given reaction, Fe is the reducing agent and V is the oxidizing agent.
What is a reducing agent?An atom or compound that loses its electrons to other substances in a reduction-oxidation reaction and gets oxidized to a higher valency state is called a reducing agent.
A reducing agent can be defined as one of the reactants of a redox reaction that reduces the other reactant by giving its electrons to the reactant. If the reducing agent can not give away its electrons to others in a reaction, then the reduction reaction cannot occur.
Given, the following chemical reaction:
2Fe + 3V₂O₃ → Fe₂O₃ + 6VO
The V₂O₃ oxidation state of V:
2 x + 3(-2) = 0
2x = 6
x = + 3
The Fe₂O₃ oxidation state of Fe:
2 y + 3 (-2) = 0
2y = 6
y = + 3
The V acts as an oxidizing agent because it accepts one electron to change the oxidation state from +3 to +2.
Fe acts as a reducing agent because it gives out its electrons to change the oxidation state from 0 to +3.
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What does a prism do?
A. It changes the wavelengths contained in a beam of light.
B. It combines wavelengths to make white light.
C. It removes specific wavelengths from a beam of light.
O D. It separates the wavelengths contained in a beam of light.
Answer:
D
the angles wich light is coming into the medium are not the same for all wavelengths (colors, at least in the visible spectrum). same for outgoing light.
the same it true for any transparent barrier between two different materials, like air and water.
A prism separates the wavelengths contained in a beam of light. Hence Option (D) is correct.
What is Prism ?A glass or other transparent object in the form of a prism, especially one that is triangular with refracting surfaces at an acute angle with each other and that separates white light into a spectrum of colours.
A prism is an optical component that serves one of two major functions: it disperses light, or it modifies the direction (and sometimes polarization) of light.
In some cases, a prism has more than one function. Prisms are usually transparent to the region of the electromagnetic spectrum being observed.
The prisms are employed to produce polarized light for optical instruments such as microscopes and polarimeters.
Mirrors are commonly utilized to fold the light beam through an optical system.
Therefore, A prism separates the wavelengths contained in a beam of light. Hence Option (D) is correct.
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Biggest oil fields in the world?
Answer:
Ghawar field location-Saudi Arabia
Burgan Field location-Kuwait
Ahvaz field location-Iran
Upper Zakum Oil Field Location-Abu Dhabi UAE
Explanation:
I learned this yesterday :D
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REACTION TYPE:
Single displacement/Oxidation-reduction
(Hope this helped UwU)
Answer:
Synthesis reaction is the answer
The reaction below is performed with 10.0 g of Al and 19.0 g of O2. How many grams of aluminum oxide will be made? 4 Al (s) + 3 O2 (g) → 2 Al2O3 (s)
Answer:
18.89 g of Al₂O₃.
Explanation:
The balanced equation for the reaction is given below:
4Al + 3O₂ —> 2Al₂O₃
Next, we shall determine the masses of Al and O₂ that reacted and the mass of Al₂O₃ produced from the balanced equation. This can be obtained as follow:
Molar mass of Al = 27 g/mol
Mass of Al from the balanced equation = 4 × 27 = 108 g
Molar mass of O₂ = 16 × 2 = 32 g/mol
Mass of O₂ from the balanced = 3 × 32
= 96 g
Molar mass of Al₂O₃ = (27×2) + (16×3)
= 54 + 48
= 102 g/mol
Mass of Al₂O₃ from the balanced equation = 2 × 102 = 204 g
SUMMARY:
From the balanced equation above,
108 g of Al reacted with 96 g of O₂ to produce 204 g of Al₂O₃.
Next, we shall determine the limiting reactant. This can be obtained as follow:
From the balanced equation above,
108 g of Al reacted with 96 g of O₂.
Therefore, 10 g of Al will react with
= (10 × 96)/108 = 8.89 g of O₂.
From the calculation made above, we can see clearly that only 8.89 g out of 19 g of O₂ given, reacted completely with 10 g of Al.
Therefore, Al is the limiting reactant and O₂ is the excess reactant.
Finally, we shall determine the mass of aluminium oxide, Al₂O₃, produced from the reaction.
NOTE: in this case, the limiting reactant will be used because it will give the maximum mass of the aluminium oxide, Al₂O₃ as all of it is consumed in the reaction.
Al is the limiting reactant and the mass of aluminium oxide, Al₂O₃ produced can be obtained as follow:
From the balanced equation above,
108 g of Al reacted to produce 204 g of Al₂O₃.
Therefore, 10 g of Al will react to produce = (10 × 204)/108 = 18.89 g of Al₂O₃.
Thus, 18.89 g of Al₂O₃ were obtained from the reaction.
what is indepent and dependent variables
Answer:
The independent variable is the cause. Its value is independent of other variables in your study.
The dependent variable is the effect. Its value depends on changes in the independent variable.
Ex: The ice cube melts on the stove.
Dependent variable: Ice Cube
Independent variable: heat of stove
Answer:
In an experiment, the IV(independent variable) is a variable that is changed to see how it affects something else, and the DV (dependent variable)is a variable that is being measured/observed.
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An element X has the proton number 18.
The next element in the periodic table is an element Y.
Which statement is correct?
Answer:
This question is incomplete
Explanation:
This question is incomplete. However, the element X with the atomic number of 18 is Argon (Ar) while the next element (element Y) in the periodic table, with atomic number 19, is potassium (K).
Element X is found in the group zero (also called group 18 and elements found therewith are referred to as noble gases) of the periodic table while element Y is found in group 1 (elements found here are referred to as alkali metals).
Element X has a completely filled outermost shell while element Y has one electron in its outermost shell.
Element X is a metal while element Y is a nonmetal.
14. Each beaker shown to the right contains iron and an
acid. In which beaker will the iron dissolve the fastest
and why?
a. Beaker A because of a higher concentration level.
b. Beaker A because of increased surface area.
C. Beaker B because of a higher concentration level.
d. Beaker B because of increased surface area.
The question is incomplete, the complete question is attached in the image below:
Answer: The correct option is D) Beaker B because of the increased surface area.
Explanation:
A solution consists of solute and solvent.
A solute is defined as a component that is present in a smaller proportion while a solvent is defined as a component that is present in a larger proportion.
Solubility is defined as the amount of solute that can be dissolved in a given amount of solvent to form a solution.
Solubility of a substance depends on a few factors:
Surface areaMolecular sizeTemperatureStirring effectFor the given images,
Beaker A has a large block of iron rod and Beaker B has iron shards.
The smaller molecular size of a substance increases its surface area and thus, increases the solubility.
Hence, the correct option is D) Beaker B because of the increased surface area.
What is the molecular geometry of Br2
Consider the following chemical reaction:
HF + NaOH - NaF + H20
Energy must be invested in order for the reaction to proceed.
What bonds must be broken in order for the reaction to proceed.
Select ALL that apply.
A. An ionic bond between sodium and hydroxide.
B. An ionic bond between sodium and fluorine.
C. A covalent bond between sodiume and fluorine.
D. An ionic bond between hydrogen and fluorine.
DE. A covalent bond between hydrogen and fluorine.
DE A covalent bond between hydrogen and oxygen
Answer: The correct options are A and E
Explanation:
A chemical reaction is defined as the reaction in which two or more chemical substances react to form two or more different chemical substances.
A new substance (product) is formed in a chemical reaction when the bonds between the reactants are broken so that the new bonds between the products can be formed.
For a given chemical reaction:
[tex]HF+NaOH\rightarrow NaF+H_2O[/tex]
Here,
HF is a covalent compound as sharing of electrons take place between hydrogen and fluorine atom
NaOH is an ionic compound as a complete transfer of electrons occurs from sodium to hydroxide.
Thus, to form the products, an ionic bond between sodium and hydroxide must be broken coupled with a covalent bond between hydrogen and fluorine.
Hence, the correct options are A and E
Two solutions are mixed, bringing together ions of Na+, PO43−, V3+, and Cl−. Use the solubility rules to identify the composition of the salt that precipitates out of the solution.
I.
Look at the pictures below. What can you say about them?
Describe their similarities and differences. Write your answer in
your notebook
Www
cowo
Politics
SXO
is
Answer:
Hey , I can't see the picture
can someone check if i did this right. thank you !!
Answer:
noo
Explanation:
its basic
....................
Answer: acidic
Explanation:
Look at the picture below. If the total mass of the reactants is 74, what will the total mass of the products be?
Answer:
74
Explanation:
The law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products
hope this helps!
The total mass of the products will also be 74 g
The law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.From the above law, we understood that in any chemical reaction, the total mass of reactants must be equal to the total mass of products i.e
Total mass of reactants = Total mass of productsFrom the question given above,
Total mass of reactants = 74 g
Total mass of products =?Total mass of reactants = Total mass of products
74 g = Total mass of products
Thus,
Total mass of products = 74 gTherefore, we can conclude that if the total mass of reactants is 74 g, then the total mass of products will also be 74 g.Learn more: https://brainly.com/question/13410855
The two general types of air pollution are _____ and _____.
invisible
particles
gases
liquid
Answer:
i think this is it
Explanation:
particles and gases
what is periodic law
Who is my favourite wrestler?
Answer:
ma herdina thesto wrestling
. Calculate the pH and the pOH of each of the following solutions at 25 °C for which the substances ionize completely:
(a) 0.200 M HCl
(b) 0.0143 M NaOH
(c) 3.0 M HNO3
(d) 0.0031 M Ca(OH)2
Based on the molarity of the solutions;
For 0.200 M HCl; pH = 0.699, pOH = 13.301For 0.0143 M NaOH; pOH = 1.845, pH = 12.16For 3.0 M HNO3; pH = -0.4771, poH = 14.4771For 0.0031 M Ca(OH)2; pOH = 2.21, pH = 11.79What pHand pOH?pH is the negative logarithm to base ten of the hydrogen ions concentration of a solution.
pH = -log[H+]pOH is the negative logarithm to base ten of the hydroxide ions concentration.
pOH = -log[OH-]Also;
pH + pOH = 14For HCl:
pH = -log [H3O+]
pH =-log (0.200)
pH = 0.699
Then;
poH= 14-0.699
pOH = 13.301
For NaOH:
pOH= -log [OH-]
= -log (0.0143)
pOH = 1.845
Then;
pH= 14-poH
= 14- 1.845
pH = 12.16
For HNO3:
pH= -log[H3O+]
=-log(3.0)
= -0.4771
Then;
pOH = 14-9-0.4771
pOH = 14.4771
For [Ca(OH)2]
molarity = 0.0031M
2 moles of OH- are produced
[OH-]= 2 × 0.0031
[OH-] = 0.0062M
pOH = - log[OH-]
=-log(0.0062)
=-log(6.2x10-3)
=-(-2.21)
pOH = 2.21
Then;
pH =14-2.21
pH =11.79
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The electrolysis of water has the equation 2H2O (l) → 2H2 (g) + O2 (g). What type of reaction is this?
A)
Single displacement
B)
Double displacement
C)
Decomposition
D)
Synthesis
Answer:b
Explanation:
describe how water molecules can hydrate various substances
Answer:
A water molecule can react with the carbonyl group of an aldehyde or a ketone to form a substance known as a carbonyl hydrate, as shown in the first reaction below. The carbonyl hydrates usually form a very small percentage of the molecules in a sample of a specific aldehyde or ketone.
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How did reducing the number of
decomposers affect the amount of carbon
dioxide in the ecosystem?
Answer:
As organisms release energy during cellular respiration, carbon dioxide is produced from the carbon in energy storage molecules. ... Carbon dioxide in the biodome decreased because decomposers decreased which means there was a decrease in cellular respiration overall.
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Determine the number of subatomic particles in bromine-35.
Number of subatomic particles=35+36+35=106
Explanation:
Atomic number=35
Mass number=71
No. of proton p=35
No. of neutron n=71−35=36
No. of electron e=35
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Answer: plastic conduces heat
Explanation:Plastics are excellent insulators, meaning they can efficiently trap heat — a quality that can be an advantage in something like a coffee cup sleeve. ... The new polymers, which are lightweight and flexible, can conduct 10 times as much heat as most commercially used polymers
28.0 g of N2 gas was found to occupy a volume of 8.44 L at a
pressure of 320 kPa. What is the temperature of the gas?
Are there options for this question? ...........
Answer:
Therefore, the temperature of the gas is 84.9 ℃. 28.0 g of N2 gas was found to occupy a volume of 8.44 L at a pressure of 320 kPa.
Explanation:
Therefore, the temperature of the gas is 84.9 ℃. 28.0 g of N2 gas was found to occupy a volume of 8.44 L at a pressure of 320 kPa.
