Answer:
The flow of energy from one trophic level to another creates the energy cycle. In this cycle, energy is neither created nor destroyed. Energy flows from one trophic level to another. The primary source of energy is solar energy. Plants uses solar energy to produce their food by the process of photosynthesis. The food produced by the plants are consumed by the primary consumers. The plan eating animals consume food produced by the plants and they form the second trophic level. In the third tropic level the carnivores get the energy by eating the herbivores. After the death of the carnivores, decomposers act on them and the nutrients are ultimately returned to the soil.
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4 Part of a human body system is pictured.
-Kidney
Ureter
Bladder
The main function of this system is to
F control reproduction
G transport oxygen
H produce hormones
J remove waste
Kidney in our body functions as a sieve in to remove wastes. Ureter, bladder and kidney as well are part of excretory system in animals. Hence, option J.
What is excretory system?Human body contains a group of organ systems to perform specific functions. Excretory system is an organ system for the excretion or removal of wastes after digestion form the body.
The main component of excretory system is kidney by which the wastes from the circulatory system is removed through urine. Ureter and bladder are extensions of kidney. After absorption of water and other nutrients remaining uric acid or urine is stored in the bladder to remove.
Kidney contains a number of sieve like structures called nephrons they are the filtering units of kidney.Nephrons are microscopic structural units of kidney by which wastes are filtered to produce urine and remove.
Therefore, all the given organs, kidney, ureter, bladder etc are part of excretory system and they plays a role in removing wastes from the body. Hence, option J is correct.
To find more about kidney, refer the link below:
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How many grams is 5.4x10 to the 23 molecules of al2o3?
Answer:
91.49 grams
Explanation:
No of molecules = no of moles × Avogadro's number
No of moles = No of molecules / Avogadro's number
Number of moles = 5.4×10^23/6.02×10^23
Number of moles = 0.897 moles of Al2O3
Number of moles = mass in gram / molar mass
Mass in gram = number of moles× molar mass
Mass in gram = 0.897× 102
91.49 grams
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4. Identify each substance in the following word equation as a reactant or a product
limestone heat lime + carbon dioxide.
5. What is the difference between an exothermic and endothermic reaction?
6. Sodium salicylate is made from carbon dioxide and sodium phenoxide. Identify each
of these substances as a reactant or a product.
Pllssssssssssssss
Explanation:
4. limestone heat lime + carbon dioxide
The reactants in this expression above is limestone
The products of the reaction is carbon dioxide and lime
Reactant is the species that gives the product and it is usually found on the left hand side of the expression.
The product is the substance on the right hand side of the expression that forms through the experiment.
Heat is used to facilitate the reaction.
5. An exothermic reaction is a reaction in which heat is given off.
An endothermic reaction is a reaction in which heat is absorbed in the process.
An exothermic reaction is always warmer after the reaction whereas an endothermic reaction is colder at the end of the reaction.
6. Sodium salicylate is made from carbon dioxide and sodium phenoxide.
The reactants are:
Carbon dioxide and sodium phenoxide
The product is:
Sodium salicylate
When naming a compound, which of these is written first?
Answer:
cation
Explanation:
Metal
Nonmetal
Anion
Cation
When naming a chemical compound, the cation is written first before anything else.
A typical ionic compound consists of two components - the cation and the anion. While the cation is positively charged in ion, the anion is negatively charged. The cation of a typical ionic compound is named first before the anion and the name often carries that of the element that composes it.
The name of the element that makes up the anion is modified by removing the last few characters ending the name and replacing it with the suffix 'ide'. For example, NaCl is named sodium chloride.
At the time of naming a compound, the one that would be written first would be:
- Cation
The compounds are described as substances that consist of varying combinations of elements from the chemical union. The compounds are given the name by starting with the cation(+ve charged ion) that it possesses followed by the anions(-ve charged ions) it contains.For example, KCl(potassium chloride) involves K+ cations and Cl- anions. Thus, 'cation' would be the correct answer among the given options as they come later in the process.Learn more about 'Compound' here:
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I NEED HELP BIG TIME PLZ HELP ME (ILL GIVE 40 POINTS) What is true of electrons? (3 points) a They are positively charged and located inside the nucleus. b They are positively charged and located outside the nucleus. c They are negatively charged and located inside the nucleus. d They are negatively charged and located outside the nucleus.
Answer:
d.
Explanation:
1. What is the theoretical
yield of C6H5Br in this reaction when 30.0 g of C6H6
reacts with excess Br2? If the
actual yield of C6H5Br was 56.7
g,
what
is
the
percent
yield?
Answer:
The theoretical yield in grams is 60.292 grams, and in moles the theoretical yield is 0.384. The percent yield is 94%.
Explanation:
The theoretical yield of bromobenzene is 60.3 grams and the percent yield of the reaction is 94.0%.
Explanation:
The percentage yield of the reaction is given by :[tex]Yield(\%)=\frac{\text{Actual or experimental yield}}{\text{Theoretcial yield}}\times 100[/tex]
Experimental yield is the amount of product produced after the carrying out the reaction practically.Theoretical yield is the amount of product calculated mathematically by using the amount of reactant.Given:
Mass of benzene = 30.0 g
The actual yield of bromobenzene = 56.7 g
To find:
Theoretical yield and percent yield of the reaction.
Solution:
Mass of benzene = 30.0 g
Moles of benzene =[tex]\frac{30.0 g}{78.11 g/mol}=0.384 mol[/tex]
[tex]C_6H_6+Br_2\rightarrow C_6H_5Br+HBr[/tex]
According to reaction, 1 mole of benzene gives 1 mole of bromobenzene, then 0.384 moles of benzene will give:
[tex]=\frac{1}{1}\times 0.384 mol=0.384 \text{mol of bromobenzene}[/tex]
Mass of 0.384 moles bromobenzene:
[tex]=0.384 mol\times 157.02g/mol=60.3 g[/tex]
The theoretical yield of bromobenzene = 60.3 g
The actual yield of bromobenzene = 56.7 g
The percent yield of the reaction:
[tex]Yield(\%)=\frac{56.7 g}{60.3 g}\times 100=94.0\%[/tex]
The theoretical yield of bromobenzene is 60.3 grams and the percent yield of the reaction is 94.0%.
Learn more about the percent yield of reaction here:
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Study the chemical reaction.
4Fe + 3O2 → 2Fe2O3
What is the mole ratio between Fe and O2?
Answer: The mole ratio between Fe and [tex]O_2[/tex] is [tex]\frac{4Fe}{3O_2}[/tex]
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The given balanced chemical equation is :
[tex]4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]
Thus 4 moles of iron (Fe) reacts with 3 moles of oxygen gas [tex](O_2)[/tex] to give 2 moles of ferric oxide [tex](Fe_2O_3)[/tex]
The mole ratio between Fe and [tex]O_2[/tex] is [tex]\frac{4Fe}{3O_2}[/tex]
please help :) thanks
Explanation:
it is the one you have selected because it is the only solid one