Answer:
Option A
A pure chemical substance consisting of one type of atom.
Explanation: An element is a pure substance and is made of only one type of atom; it cannot be broken down into a simpler substance.
An element is defined as a pure chemical substance consisting of one type of atom.
What is an element?
It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.There are 118 elements known to exist either naturally or artificially.
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An aqueous solution of 4 mol/L nitric acid is electrolysis in an electrolytic cell using graphite electrodes.
Name the gas given off at the anode
The gas given off at the cathode is hydrogen while the gas given off at the anode is oxygen.
What is electrolysis?The term electrolysis has to do with the decomposition of a substance by the passage of a direct current through it.
The ions present in the system are[tex]H^+[/tex], [tex]OH^-[/tex] and [tex]NO_3^-[/tex] ions. The gas given off at the cathode is hydrogen while the gas given off at the anode is oxygen.
The half-reaction equation of the reduction is;
[tex]2H^+(aq) + e[/tex] → [tex]H_2(g)[/tex]
The oxidation half-reaction equation is;
[tex]4OH^- (aq)[/tex] → [tex]2H_2O(l) + 4e[/tex]
The overall equation is;
[tex]4H^+(aq) + 4OH^- (aq)[/tex] → [tex]4H_2(g) + 2H_2O(l) + 4e[/tex]
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Based on our consumption of fossil fuels today, what can be predicted will eventually occur? Select all that apply
Based on consumption of fossil fuels today, It can be predicted Fossil Fuels will eventually be used up and a new energy developed to supply energy needs of the world.
What are fossil fuels ?Fossil fuels are made from decomposing plants and animals.
These fuels are found in the Earth's crust and contain carbon and hydrogen, which can be burned for energy.
Coal, oil, and natural gas are examples of fossil fuels.
Above given fossil fuels are expected to be used up and a new energy developed to supply energy needs of the world.
Therefore, Based on consumption of fossil fuels today, It can be predicted Fossil Fuels will eventually be used up and a new energy developed to supply energy needs of the world.
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A can of coke which is 12.0ml and is at a temperature of 18.0°C is placed into a refrigerator freezer. The
can was accidently left over night and the temperature dropped to -1.00°C. What would happen to the
volume of the coke can?
Answer:
See below
Explanation:
Volume would decrease to temp of approx 4 C then it would slightly increase to the 1 degree C point but it would still be a smaller volume than at 18 C .
( this assumes a freezing point of - 1.11 C for Coke )
What does the NaBr + Cl₂ represent
in the reaction?
NaBr + Cl₂ →>>
NaCl + Br₂
Answer:
The reactants
Explanation:
The molecules on the left side of the reaction are the reactants. Reactants are the molecules which react with one another to form something new.
The molecules on the right side of the reaction are the products. Products are the molecules that form in response to the reaction.
□ 4. In a closed container, the temperature is increased by 50%. Which of the following will happen to the gas inside the container?
O It will remain unchanged.
The molecules will move more slowly.
The molecules will exert less pressure on the container walls
O The molecules will move more quickly.
Answer: The molecules will move more quickly.
Explanation:
As temperature increases, the kinetic energy of the particles increases, causing them to move more quickly.
Please help ASAP
Is there any evidence that a reaction has occurred? (One or more answers may be true.)
a. No, there is no change in the solution.
b. Yes, because H2SO4 is being added.
c. Yes, a precipitate formed.
d. Yes, there is a change in conductivity.
what are the 3 common gases that give off reactions?
The 3 common gases that give off reactions are Hydrogen sulfide, Carbon monoxide, Nitrogen oxides.
What are off reactions
Off reactions are defined as chemical reactions that occurs when something burns or during combustion of materials which gives off energy.
Some gases that give off reaction are:
Hydrogen sulfideCarbon monoxideNitrogen oxidesNote that these gases are mostly poisonous.
Therefore, the 3 common gases that give off reactions are Hydrogen sulfide, Carbon monoxide, Nitrogen oxides.
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The ideal gas law only approximates the behaviour of real gases. The conditions
under which the ideal gas law is MOST accurate are
Answer:
I d K
Explanation:
What kind of exercise does not require the use of oxygen to metabolize energy? strength aerobic stretching anaerobic
Answer:
See Below
Explanation:
'an aerobic ' means it does not use oxygen
Answer:
anaerobic
Explanation:
The chemical formula for a emerald is BeAl2(SiO3)6.
An emerald can be described as
Emerald can be described as a transparent, green coloured gem stone made up of mineral beryl together with trace amount of chromium or sometimes vanadium having chemical formula as [tex]Be_3Al_2(SiO_3)_6[/tex] .
Through time, the emerald has been known as a symbol of truth and love.
In ancient Greece and Rome, emerald was said to be the gemstone of the goddess Venus, purveyor of love and hope.
On the other side of the world, emeralds were revered by the Incas and believed by the Egyptians to be a source of eternal life.
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How much energy is required to heat 36. 0 g h2o from a liquid at 65°c to a gas at 115°c? the following physical data may be useful.
The required energy will be "87752 J".
What is energy?The definition of energy is "ability to do work," which is the capacity to apply a force that causes an item to move.
Mechanical, heat, chemical, electrical, radiant, nuclear, and sound are the seven types of energy.
The energy will be:
Q1 = 36 × 3.18(100-65)
Q1 = 5267 J
Moles of water = [tex]\frac{36.0}{18}[/tex]
Moles of water = 2
then,
Q2 = 2× 40.7
Q2 = 81.4 KJ
Q2 = 81400 J
Q3 = 36.0 × 2.01(115-100)
Q3 = 1085 J
hence,
Required energy will be= Q1+ Q2+ Q3
Required energy = 5267 + 81400 + 1085
Required energy = 87752 J
hence, 87752 J energy is required to heat 36. 0 g h2o from a liquid at 65°c to gas at 115°c.
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explain why nickel is a good conductor of heat
Answer:
Its a good conductor because its a metal
Answer:
periodic table
Explanation:
in its magnetic properties and chemical activity it resembles iron and cobalt
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
. You need to prepare 755ml of a 3.50M solution of sodium hydroxide solution. If
the original solution had a molarity of 20.0M how much should you take out to
make the diluted solution?
M₁V₁=M₂V₂
20 x V₁ = 3.5 x 755
V₁ = 132.125 ml
When some water condensed
onto a glass, it released 9.15 Cal
of energy. How many joules of
energy is this?
[?] joules
When we convert 9.15 Calories to joules, the result obtained is 38.28 Joules
How do i convert 9.15 calories to joules?From the question given above, the following data were obtained:
Energy (in Calories) = 9.15 caloriesEnergy (in Joules) =?The conversion scale to convert calories to joules is given below:
1 Calorie = 4.184 Joules
Using the above scale, we can convert 9.15 calories to joules as shown below:
1 Calorie = 4.184 Joules
Therefore,
9.15 Calories = (9.15 Calorie × 4.184 Joules) / 1 Calorie
9.15 Calories = 38.28 Joules
Thus, we can conclude from the above calculation that the energy in joules is 38.28 Joules
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Answer:
38,200J
Explanation:
9.15 x 4.18 x 1000= 38,247 → 38,200J
Balance the equation in the space below for the reaction of ammonia and oxygen, using the smallest whole number coefficients
NH₂(g) + O₂(g) → N₂(g) + H₂O(g) + energy
The balanced equation of the reaction is:
2 NH₂(g) + O₂(g) → N₂(g) + 2 H₂O(g) + energy What is a balanced equation of a reaction?A balanced equation is an equation of a reaction in which the moles of atoms of elements in the reaction are equal on both sides of the equation.
The given equation can be balanced as follows:
2 NH₂(g) + O₂(g) → N₂(g) + 2 H₂O(g) + energy
Therefore, the balanced equation of the reaction is the one in which the moles atoms of reacting elements are equal.
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Question 3
Not yet
answered
Points out of
If you dissolve 2.70 g of NaCl in 425 mL of water, what is the molarity of the
solution? (Report your answer to three places past the decimal point. Moodle is
looking for a number only, no units.)
I added a screenshot because I recently answered the same question. I hope this helps you!! :)
What is the si unit that refers to the number of particles contained in a substance.
Answer:
one mole contains exactly 6.022 14076 into 10 23 elementary this number is the fix numerical value of the evandi and the constant and a b where expects in the unit mol - 1 is called the abacation number that amount of substance of a system is measured of the number specific
• Reflect on the importance of stoichiometry and rate of chemical reaction in the design of car airbags
Answer:
If an insufficient amount of nitrogen were produced, the air bag would under inflate and not provide adequate protection. Clearly, the stoichiometry of the reaction is very important.
The human skeleton is made mostly
of hard blank
tissue.
Will sodium iodide react with bromine to produce sodium bromide and iodine? Why or why not?
Question 10 options:
A) Yes, because bromine has lower activity than iodine
B) No, because bromine has higher activity than iodine
C) No, because bromine has lower activity than iodine
D) Yes, because bromine has higher activity than iodine
I believe its either B or D
Answer:
C
Explanation:
The higher the period the higher the activity of an element, therefore, since iodine is in period 6 and bromine is in period 5, the described reaction is not possible due to the fact that bromine is less active
Which of the following is the best thermal insulator to reduce the transfer of
thermal energy by radiation?
O A. Air
OB. Glass
O C. Wood
OD. A vacuum
Among the given mediums, Vaccuum is the best thermal insulator to reduce the transfer of thermal energy by radiation as there will be no air particles which carries heat from one place to other. Hence, Option (D) will be the correct option
What is Heat radiation ?Heat Radiation refers to the transfer of heat from a hot body to cold body directly, without heating the medium between two bodies.
Vaccum does not have any particles in it. Thus, there will be no transfer of heat through it.
The best example of it is thermous flask in which vaccuum inside thermous flask reduces the transfer of energy through it.
Hence,Among the given mediums, Vaccuum is the best thermal insulator to reduce the transfer of thermal energy by radiation as there will be no air particles which carries heat from one place to other. Thus, Option (D) will be the correct option
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When hydrated copper(II) sulfate crystals are heated, anhydrous copper(II) sulfate forms. A mass of 12.5 g of hydrated copper(II) sulfate crystals is heated in a crucible until all the water of crystallisation is removed.
A mass of 8.0 g of anhydrous copper(II) sulfate forms.
Calculate the formula of hydrated copper(II) sulfate CuSO4.nH2O
Show your working.
[Mr of CuSO4 = 159.5 Mr of H2O = 18]
Mass of water = g
Water of crystallization (n) =
Formula of hydrated copper(II) sulfate =
The formula of hydrated copper(II) sulfate is CuSO4.10H2O
What is the formula of the hydrated copper (ii) sulfate salt?The formula of the hydrated copper (ii) sulfate is determined as follows:
Mass of hydrated salt = 12.5 g
Mass of anhydrous salt = 8.0 g
Mass of water = 12.5 - 8 = 4.5 g
mole ratio of water and anhydrous salt is;
4.5/18 : 8.0/159.5
0.562 : 0.05
10 : 1
Water of crystallization (n) = 10.
Therefore, the formula of hydrated copper(II) sulfate is CuSO4.10H2O
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The exothermic reaction between solid aluminium powder and solid manganese (IV) oxide, produces solid manganese and
another product. How many moles of aluminium powder are needed to produce 203.7 grams of manganese?
The number of moles of aluminum powder needed to produce 203.7 grams of manganese is 5 moles.
How to calculate the number of moles of Aluminium powder?Heat, Mn, and Al2O3 are produced when aluminum powder and manganese dioxide are heated.
[tex]3MnO_{2} + 4Al - > 3Mn + 2Al_{2} O_{3} + Heat[/tex]
The balanced chemical equation in this situation indicates that there are 3 moles of manganese and 4 moles of aluminum involved in the reaction, which results in a 3:4 mole ratio.
You may make use of this mole ratio by calculating how many moles of aluminum are required to react with the 203.7g of Manganese. So,
Firstly, the mass of Aluminium has to be taken out
Let the mass be considered x.
So, the number of moles of Aluminium = x/27
Number of moles of Manganese = 203.7/54
Hence, the mass x will be,
[tex]x = 4 *203.7 * 27 / 3 * 54[/tex]
[tex]x = 135.8g[/tex]
Hence, the number of moles of Aluminium is = 135.8/27 = 5 moles.
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Which compound contains only nonpolar covalent bonds?.
Answer:
02 or oxygen if im not mistaken
Match the zone to its characteristics.
Horse latitudes
Subpolar low
Doldrums
?
?
?
Heavy precipitation, little
wind
The trade winds and
westerlies originate here
Lies along the polar jet
stream
The zone and its characteristics include the following:
Subpolar low: Lies along the polar jetstream.Horse latitudes: The trade winds and westerlies originate here.Doldrums: Heavy precipitation, little wind.What is Horse latitude zone?This is referred to regions which is located at about 30 degrees north and south of the equator and forms the basis of westerlies.
The other zones such as doldrums are also found at the equator with their respective features and can be seen above. This therefore makes it the most appropriate choice.
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The density of lead is 11.3 g/mL. What is the mass of 45 mL of the metal?
Answer:
510g
Explanation:
45mL..
1mL
_____ = 510g
11.3g
4 Many tourists to China want to see giant pandas. Suggest how this could be used to help to conserve the pandas.
Answer: to protect giant pandas
Explanation:
Please help!
Three sections of the periodic table are labeled A, B, and C in the image below.
Which of the following statements is most likely true for an element present in section A?
It is dull and brittle.
It is malleable and ductile.
It is a liquid at room temperature.
It is a poor conductor of electricity.
Answer:
they are metals so they are:-
-malleable
-ductile
because metallic bonding is the same in all direction throughout the solid
Which shows two structures that are made mostly of metal?
Answer:
The bell and the Eiffel tower