Answer:
Natural resources are the resources that are available in the nature. There is no human involvement in the production or manufacture of the natural resources. These resources helps in adding capital and growth to the development of the country. Natural resources are found in abundance but they are non-renewable resources. This means that it takes millions of years for their formation. Once exhausted, their replacement would became very difficult. Conversation of the natural resources has been one of the global action. Developed nations are equipped to find ways by which natural resources can be saved and used in a way that they do not extinguish. Many alternative methods and techniques have been adopted to preserve them. Natural resources like oil, gold and coal are performed after going through a process of many years. Hence, there replacement becomes very challenging and difficult respectively.
Which of the following practices below are used to help conserve soil?
Select 3 answers that apply.
Look at the picture.
Answer:
B, C ,E those are the three practice in the options you have
28g of aluminum reacts with 45g oxygen
1) complete balanced equation?
2) what is the limiting reactant?
3) how many grams of product could be formed?
4) how many grams of excess would you predict?
5) if you actually measured 50g of product, what is the percent yield?
Answer:
answer below:
Explanation:
1) 4 Al + 3 O2 --> 2Al2O3.
2) Al mol= 28/27 = 1.037mol
O mol= 45/16 = 2.812mol
Al : O
4 : 2
x : 2.812
cross multiply
4 x 2.812/2 = 5.624 mol of Al
Al is limiting reactant
3) 28/5.246 = 5.34product can be formed (not that much sure)
4) 45/ 0.5185 = 86.79
86.79 - 5.34 = 81.45g
5) 50 / 81.45 x 100 = 61.39% ( i guess)
i hope this hleps you
What is the oxidation number for Mn in the following compound?
Mn(NO₃)₄
7. Where do amino acids reside ?
Answer:
Explanation:
Polar side chains tend to be present on the surface of a protein where they can interact with the aqueous environment found in cells. On the other hand, non-polar amino acids tend to reside within the center of the protein where they can interact with similar non-polar neighbors.
how does pentene become pentane?
How does propene become propane?
Calculate the volume of 12.0 g of helium at 100° C and 1.2 atm.
Answer:
the answer I think is 76.5L
3. Why are amino acids important in living organisms?
Answer:
Explanation:
Their role is to compose proteins. Amino acids have many biologically important functions. They are also energy metabolites,many of them are essential nutrients. Amino acids can function as chemical messengers in communication between cells.
Answer:
well Aside from their role in composing proteins, amino acids have many biologically important functions. They are also energy metabolites, and many of them are essential nutrients. Amino acids can often function as chemical messengers in communication between cells.
Explanation:
this should be the answer
Pls help me with this problem
Answer:
B
Explanation:
The triple point is the temperature and pressure in which the three states or phases of a matter coexist with one another.
For example, the triple point of pure water is 0.01°C and 4.5mmHg
4. For water, H20 represents
only the empirical formula
only the molecular formula
only the structural formula
both the empirical & molecular formulas
Answer:
The empirical and molecular formula because the ratio is 2:1 and there is 2 hydrogen atoms and 1 oxygen atom.
Hope this helps!
which bond type involves the sharing of valence electrons?
NEED HELP ASAP PLEASE!!!!
Answer:
Covalent Bond
Explanation:
A covalent bond involves electrons being shared between atoms. The most stable state for an atom occurs when its valence electron shell is full, so atoms form covalent bonds, sharing their valence electrons, so that they achieve a more stable state by filling their valence electron shell.
Where does uranium, the main source of nuclear power, come from?
a.Uranium is produced by mining deposits of this mineral found in Earth’s crust.
b.Uranium is produced continually from light energy from the Sun.
c.Uranium is produced by the compaction of animal and plant matter in the earth.
d. Uranium is produced by the conversion of precious metals into a new substance.
Answer:
Uranium is produced by mining deposits of this mineral found in earth's crust
Why does it seem that the sun is rising and setting in the sky?
Answer:
Because of the earths rotation
Explanation:
But it appears to rise and set because of the Earth's rotation on its axis. It makes one complete turn every 24 hours. ... As the Earth rotates toward the east, it looks like the sun is moving west. As the Earth rotates, different locations on Earth pass through the sun's light.
Answer:
When the earth is rotating, it is rotating away and towards the sun which is why we have day and night
Explanation:
in which of the following is number of neutrons correctly represented?
Answer:
²³⁸₉₂U has 146 neutrons
Explanation:
To know which option is correct, we shall determine the number of neutrons in each case. This can be obtained as follow:
For ²⁴₁₂Mg:
Mass number (A) = 24
Proton number (P) = 12
Neutron number (N) =?
A = P + N
24 = 12 + N
Collect like terms
N = 24 – 12
N = 12
Thus, there are 12 neutrons in ²⁴₁₂Mg
For ⁷⁵₃₃As:
Mass number (A) = 75
Proton number (P) = 33
Neutron number (N) =?
A = P + N
75 = 33 + N
Collect like terms
N = 75 – 33
N = 42
Thus, there are 42 neutrons in ⁷⁵₃₃As
For ¹⁹₉F:
Mass number (A) = 19
Proton number (P) = 9
Neutron number (N) =?
A = P + N
19 = 9 + N
Collect like terms
N = 19 – 9
N = 10
Thus, there are 10 neutrons in ¹⁹₉F.
For ²³⁸₉₂U:
Mass number (A) = 238
Proton number (P) = 92
Neutron number (N) =?
A = P + N
238 = 92 + N
Collect like terms
N = 238 – 92
N = 146
Thus, there are 146 neutrons in ²³⁸₉₂U
Considering the options and the illustration made above, Only ²³⁸₉₂U has the correct number of neutrons written along side.
PLEASE HELP!
1) What type of reaction is this?
Zn + 2HCl -----> ZnCl + H
2) Balance the equation (Hint, you need to balance the left side with the right side)
1) single replacement
2) Zn + 2HCl -----> ZnCl + H
equation is already balanced
What is the difference between a pure solvent and a solution? Do they have the same physical properties?
Answer:
The physical properties of a solution are different from those of the pure solvent. ... Colligative properties are those physical properties of solutions of nonvolatile solutes that depend only on the number of particles present in a given amount of solution, not on the nature of those particles.
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A sample of carbon dioxide gas (CO2) contains 8.551 x 1025 molecules. How many moles of carbon dioxide does this represent?
Answer:
142.0 moles CO₂
Explanation:
To answer this question, we first need to know what a mole is. A mole represents [tex]6.022 \cdot 10^{23}[/tex] of something, and in this case, that something is molecules.
So, to convert [tex]8.551 \cdot 10^{25}[/tex] molecules into moles, we need to use the conversion factor [tex]1=\frac{6.022\cdot 10^{23} \text{molecules} }{ \text{1 mole}}[/tex].
Doing so (using dimensional analysis) gives us:
[tex]8.551 \cdot 10^{25} \text{ molecules } \cdot \frac{\text{1 mole}}{ 6.022\cdot 10^{23} \text{ molecules} } = \frac{8.551 \cdot 10^{25}}{ 6.022\cdot 10^{23}} \text{ moles CO}_2 = \\ \\ 141.996 \text{ moles CO}_2 = \boxed{142.0 \text{ moles CO}_2 }[/tex]
One mol of air contains 0.74 moles of nitrogen gas and 0.25 mol of oxygen gas. Compute the partial pressure of these gases at a total pressure of 1.7 atm and at a total pressure of 4.7 atm.
Explanation:
Partial pressure of a gas is the product of the mole fraction of that gas, which is the ratio of the no. of moles of the gas to the total no. of moles, and the total pressure.
total no. of moles=0.74+0.25=0.99 mol
mole fraction of N2=0.74/0.99=0.7475
mole fraction of O2=0.25/0.99=0.2525
total pressure=1.7+4.7=6.4 atm
partial pressure of N2=0.7475×6.4=4.784 atm
partial pressure of O2=0.2525×6.4=1.616 atm
500.0 mL of a gas is collected at 745.0 mmHg. What will the
volume be at 760 mmHg?
Answer:
490 ml
Explanation:
1N2 + 3H2 -->
2NH3
When 23.15 g of N, and 36.85 g of H2 react, what is the maximum amount of NH3 that can be produced?
Answer:
28.23 g NH₃
Explanation:
The balanced chemical equation is:
N₂(g) + 3 H₂(g) → 2 NH₃(g)
Thus, 1 mol of N₂ reacts with 2 moles of H₂ to produce 2 moles of NH₃. We convert the moles to mass (in grams) by using the molecular weight (MW) of each compound:
MW(N₂) = 2 x 14 g/mol = 28 g/mol
mass N₂= 1 mol x 28 g/mol = 28 g
MW(H₂) = 2 x 1 g/mol = 2 g/mol
mass H₂ = 3 mol x 2 g/mol = 6 g
MW(NH₃) = 14 g/mol + (3 x 1 g/mol) = 17 g/mol
mass NH₃= 2 moles x 17 g/mol = 34 g
Now, we have to figure out which is the limiting reactant. For this, we know that the stoichiometric ratio is 28 g N₂/6 g H₂. If we have 36.85 g of H₂, we need the following mass of N₂:
36.85 g H₂ x 28 g N₂/6 g H₂ = 171.97 g N₂
We have 23.15 g N₂ and we need 171.97 g. So, we have lesser N₂ than we need. Thus, the limiting reactant is N₂.
Now, we calculate the product (NH₃) by using the stoichiometric ratio 34 g NH₃/28 g N₂, with the mass of N₂ we have:
23.25 g N₂ x 34 g NH₃/28 g N₂ = 28.23 g NH₃
Therefore, the maximum amount of NH₃ that can be produced is 28.23 grams.
Fill in the two blanks
Answer:
A.) Longer and Shorter
Explanation:
If the wavelength of a light wave is shorter that means the frequency will be higher.
That means that longer wavelengths have a lower frequency.
Name this alkane.
A five-sided polygon with one point facing left. A straight line extends from that point, then a line slanting up to the left, then another straight line extends left.
propylcyclopentane
pentylpropane
nonacyclotane
phenylcyclopentane
Answer:
propylcyclopentane
Explanation:
The rest Are swiggly lines and more than 5 sides
The organic compounds which consist of single bonded carbon and hydrogen atoms are called alkanes. They are also called the saturated hydrocarbons. Here the given alkane is propylcyclopentane. The correct option is A.
What is propylcyclopentane?The propylcyclopentane is an alkane which is the simplest family of hydrocarbons. It is a cyclic hydrocarbon which acts as the major component of gasoline and it is also used in the manufacture of synthetic resins and rubber adhesives.
The propylcyclopentane is an important cycloalkane which contains five carbon atoms bonded to two hydrogen atoms above and below the plane. It appears as a clear colourless liquid with a petroleum like odor. It is less dense than water and it is insoluble in water.
Propylcyclopentane is a member of cyclopentanes, a cycloalkane and a volatile organic compound. Its molecular formula is C₈H₁₆. It can also be called as 1 - Cyclopentylpropane.
Thus the correct option is A.
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What is the number of moles of H2 produced when 23 g of sodium react with water according to the equation 2Na(s) + 2H2O(l) 2NaOH(aq) + H2(g)
Answer:
0.5 mole of H₂.
Explanation:
We'll begin by calculating the number of mole in 23 g of Na. This can be obtained as follow:
Mass of Na = 23 g
Molar mass of Na = 23 g/mol
Mole of Na =?
Mole = mass / Molar mass
Mole of Na = 23 / 23
Mole of Na = 1 mole
Next, the balanced equation for the reaction.
2Na + 2H₂O —> 2NaOH + H₂
From the balanced equation above,
2 moles of Na reacted to produce 1 mole H₂.
Finally, we shall determine the number of mole of H₂ produced by the reaction of 23 g (i.e 1 mole) of Na. This can be obtained as follow:
From the balanced equation above,
2 moles of Na reacted to produce 1 mole H₂.
Therefore, 1 mole of Na will react to produce = (1 × 1) / 2 = 0.5 mole of H₂.
Thus, 0.5 mole of H₂ is obtained from the reaction.
When the equation H2 + Fe3O4 = Fe + H2O is completely balanced using the smallest whole numbers, the coefficient oH2 would be A.) 1 B.)2 C.) 3 D.) 4
Answer:
H2 would have a coefficient of 2.
Explanation:
According to the balanced chemical equation, the coefficient of hydrogen is 4.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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Explain how trait are governed by the genetic material found in the genes within chromosomes in the cell nucleus.
Answer:
Genes determine which phenotypes you get
Explanation:
When you have a gene, it determines what proteins get bonded together. Such as eye color, hair color, hair type, etc.
Genes are the elements that influence traits. Alleles are the many varieties of a gene. Trait inheritance is controlled by individual alleles. While some alleles are recessive, others are dominant.
What are genes ?The term "gene" can be interpreted in a number of ways. The molecular gene is a sequence of nucleotides in DNA that is transcribed to form a functional RNA, whereas the Mendelian gene is the fundamental unit of inheritance. Protein-coding genes and noncoding genes are the two categories of molecular genes.
Chromosomes, which are found in the cell nucleus, are where genes are found. There are hundreds to thousands of genes on each chromosome. There are 46 chromosomes in all, or 23 pairs, in each typical human cell.
Some features are controlled by genes that are passed down from parents to their children, while others are learned via observation and experience, and the majority are influenced by genetics.
Thus, Alleles are the many varieties of a gene.
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A person who controls access to the decision maker is called a(n)
Answer:
Wdym?
Explanation:
I don't understand this question
Answer:
gatekeeper
Explanation:
The partial pressures of CH4, N2, and O2 in a sample of gas were found to be 248 mm Hg, 707 mm Hg, and 518 mm Hg, respectively. What is the mole fraction of Nitrogen gas?
total pressure=248+707+518=1473mmHg
partial pressure=total pressure×mole fraction
mole fraction of N2
=partial pressure of N2/total pressure
=707mmHg/1473mmHg
=0.4800
What causes dipole interactions?
bonding of a covalently bonded hydrogen to an unshared electron pair
attraction between ions
attraction between polar molecules
sharing of electron pairs
what do you need to know
What statements are true about mutations to DNA?
Answer:
Is this a general question or is there supposed to be a picture
Explanation:
i really need these solved, it’s asking for half equations!!
Answer:
Net equation: Cu + 2Ag+ ⇒ 2Ag + Cu2+
Explanation:
Cu + 2N03- + 2Ag+ ⇒ 2Ag + 2NO3- + Cu2+
The 2NO3- cancel out since they're spectator ions
∴ Cu + 2Ag+ ⇒ 2Ag + Cu2+
Half equations are:
Cu ⇒ Cu2+
2Ag+ ⇒ 2Ag
Balancing both sides of each equation with electrons will lead back to the Net equation.