Answer:
Gypsum and Selenite have the same chemical composition but differ in crystallisation habit. Selenite is usually crystalline and the association of the impurities is superficial which are eliminated by washing. Gypsum is fine grained in nature and is beneficiated by flotation only.
Is this statement true or false?
Decomposers such as bacteria recycle dead tissue into reusable chemicals for other producers. Then the consumers eat the producers. This is an example of how nutrients are recycled through an ecosystem
It is true that decomposers such as bacteria recycle dead tissue into reusable chemicals for other producers, which are then eaten by consumers.
What is nutrient recycling?Nutrient recycling is the process by which essential elements in the ecosystem are in transition between abiotic and biotic factors.
In an ecosystem, the following groups of organisms exists:
Producers e.g plantsConsumers e.g. herbivores, carnivoresDecomposers e.g. bacteria, fungiDecomposers are responsible for breaking down dead tissues of living organisms leading to the release of nutrients to the soil. These nutrients are used by producers, which are then eaten by consumers.
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We looked at the acrylonitrile molecule, c3h3n, in the previous exercise. Which of the following statements about the molecule is or are true? i. The c—c single bond results from overlap between an sp hybrid and an sp 2 hybrid. Ii. There are two unhybridized p orbitals on the n atom. Iii. All the atoms in the molecule lie in the same plane.
The true statemments that reflect the nature of the compound are statements (i) and (ii).
What is acrylonitrile?The molecule acrylonitrile has thre carbon and hydrogen atoms and one nitrogen atom. The c—c single bond results from overlap between an sp hybrid and an sp 2 hybrid. Also, there are two unhybridized p orbitals on the N atom.
Hence; among the options, the true statemments that reflect the nature of the compound are statements (i) and (ii).
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Which term describes this reaction? 2 central carbons double bonded to each other, with h above right and left and below right and left plus upper c l single bond upper c l right arrow 2 central c single bonded to each other; each is single bonded to upper c l above, and to h below and to the outside. addition condensation elimination substitution
Answer:
Which term best describes this reaction?
CH₃ H ┌ CH₃ H ┐
│ │ │ │ │ │
n C ═ C ➝ ├ C ── C ┤
│ │ │ │ │ │
H H └ H H ┘
❌ A) condensation polymerization
✔️ B) addition polymerization❌ C) hydrohalogenation
❌ D) hydration
I Took Question Test And Have Nice Day.
Answer:
The best answer out of the 4 Would be A. Addition
Explanation:
I took the Test.
Which describes isotopes? check all that apply. isotopes have the same atomic mass. isotopes have the same atomic number. isotopes are always stable. isotopes are always radioactive. isotopes are stable or radioactive. isotopes have different mass numbers.
Answer:
See below
Explanation:
Isotopes:
are atoms of the same element.have same number of electrons and protons.have different number of neutrons.have same atomic number.have different mass number.are either stable or reactive.Example:
Hydrogen has three isotopes, protium, deutrium and tritium.Chlorine has two isotopes, Chlorine-35 and chlorine-37.[tex]\rule[225]{225}{2}[/tex]
Any group of an element's isotopes will always contain an equal amount of protons and electrons. Their individual nuclei's capacity for holding neutrons will vary. The correct options are B, D, and F.
A set of atoms with the same atomic number but differing masses is known as an element's isotope. This indicates that the number of protons in each atomic nucleus and the number of electrons in the electron cloud of each isotope of an element is the same.
Some isotopes experience radioactive decay because of their unstable atomic nucleus. These isotopes are known as radioisotopes (or radionuclides) because they are radioactive by nature. Carbon-14, tritium (hydrogen-3), chlorine-36, uranium-235, and uranium-238 are a few examples of radioactive isotopes.
Thus the correct options are B, D, and F.
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15. The specific heat of silver is 0.24 J/g*^ 0 C How many joules of energy are needed to warm 4.37 g of silver from 25.0C to 27.5 degrees * C ? 0.14 J 46 J 0.022 J
2.62J of energy will be required to warm a silver metal from a temperature of 25°C to 27.5°C.
How to calculate joules?The energy required in a calorimetry can be calculated using the following formula:
Q = m × c × ∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperatureAccording to this question, 4.37 g of silver should be heated from 25°C to 27.5°C. The heat required is as follows:
Q = 4.37 × 0.24 × (27.5 - 25)
Q = 1.0488 × 2.5
Q = 2.62J
Therefore, 2.62J of energy will be required to warm a silver metal from a temperature of 25°C to 27.5°C.
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1. How many grams of NaOH are contained in 5.0 x 10^2mL of a 0.74 M sodium hydroxide solution?
a. 15 g
b. 74 g
c. 0.37 g
d. 30 g
e. 370g
Are all types of bacteria harmful? Explain
Answer:
No, not all are harmful.
Explanation:
There are bacterias that are harmful, yes, but millions, maybe even billions are helpful. Probiotics, healthy bacteria, as some like Lactobacilli and Bifidobacterium. There are a lot more, but just these two examples are helpful. Lactobacili is helpful with your digestive system. Bifidobacterium is geared towards your mouth and the vaginal area of women in mammals, like humans.
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I hope this helps!
-No one
How fast is the wind have to blow to be classified as a hurricane?
74 mph (64 KT)
Explanation:
when the wind exceeds 74 mph (64 KT), the storm is considered to be a hurricane.
Particle theory states that particles in gases move the most particles in solids show no movement at all???
True or false
true
the can't change their shapeOk take two tell me if u can see it or not it's #9
ANSWER DISCLAIMER; IF DISSATISFIED, REPORT THIS ANSWER AS SOON AS POSSIBLE:
*This may not be an option but this is most definently another way of saying the answer, through this, learning can be improved instead of giving the answer right off the bat.*Answer:
The motion of the gas particles is random and in a straight-line.
Explanation:
According to the kinetic hypothesis, a gas is made up of a huge number of submicroscopic particles (atoms or molecules) that are all in continual, random motion. The swiftly moving particles clash with one another and with the container's walls on a regular basis. The phrase ideal gas refers to a hypothetical gas made up of molecules that adhere to a few rules: The molecules of an ideal gas do neither attract or repel one another. The sole interaction between perfect gas molecules would be an elastic collision when they collided or an elastic collision with the container's walls.
Which is a characteristic of a strong base? it turns pink phenolphthalein colorless. it turns blue litmus paper red. it releases h ions into a solution. it removes h ions from solution.
The characteristic of a strong base is that it removes H⁺ ions from solution.
What is strong bases?Strong bases are those substance which have a pH range in between the value of 7.1 to 14.
Strong bases changes the colorless phenolphthalein into pink color in basic medium, so first option is incorrect.Strong bases chnages red litmus paper to blue color, so second option is also incorrect.Bases not gives H⁺ ion to the solution, so it is also not correct.Strong bases removes H⁺ ion from the solution by their consumption and makes solution more basic.So, strong bases removes H⁺ ion from the solution.
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Answer:
It removes H+ ions from solution.
Explanation:
i got it right
Question 1
13 pts
When cells divide they ____
Answer:
multiply (make new cells)
If a solute has really strong bonds between its particles, would you expect it to form a solution that gets hold or cold? Explain your reasoning.
Answer:
The temperature of the solute/solvent without any external effect would decrease.
Explanation:
As the bonding between the solute particles is really strong, therefore a large amount of energy is required to overcome these forces. So that the new bonding between the solute and solvent is created.
In order to achieve this, there will be a lot of energy required and that is through the heating process. So the solution will require energy so the solute will dissolve fully either by provision of external force i.e stirring or by heating.
Explanation:
A chemist is using a solution of hno3 that has a ph of 3.75. what is [h ] for the solution?
A chemist is using a solution of HNO₃ that has a pH of 3.75. what is [H⁺] for the solution is 1.7 × 10⁻⁴M.
How do we calculate the [H⁺]?Concentration of H⁺ ion will be calculated by using the below equation of pH as:
pH = -log[H⁺]
or [H⁺] = [tex]10^{-pH}[/tex]
Given that, pH = 3.75
So concentration of H⁺ ion will be calculated as:
[H⁺] = [tex]10^{-3.75}[/tex]
[H⁺] = 1.7 × 10⁻⁴M
Hence concentration of H⁺ ion is 1.7 × 10⁻⁴M.
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Which of the following aqueous solutions will have a pH that is significantly different from the rest?
0.1 M H 2SO 4
0.1 M HNO 3
0.1 M HC 2H 3O 2
0.1 M HCl
Among the given aqueous solutions, the solution with a significantly different pH from the rest is 0.1 M HC₂H₃O₂ (acetic acid).Option C
H₂SO₄ (sulfuric acid), HNO₃ (nitric acid), and HCl (hydrochloric acid) are strong acids that dissociate completely in water. They produce a high concentration of H₃O⁺ ions, resulting in a low pH. Acetic acid, on the other hand, is a weak acid that only partially dissociates in water. It produces a smaller concentration of H₃O⁺ ions, resulting in a higher pH compared to the strong acids.
When a strong acid like HCl, H₂SO₄, or HNO₃ is dissolved in water, it completely dissociates to release H₃O⁺ ions. The resulting solution will have a very low pH, usually close to 0. However, acetic acid (HC₂H₃O₂) only partially dissociates, and the concentration of H₃O⁺ ions is lower. As a weak acid, it has a higher pH compared to strong acids, typically around 2.4.
In summary, among the given options, the aqueous solution of 0.1 M HC₂H₃O₂ (acetic acid) will have a significantly different pH from the rest, with a higher pH value due to its weak acid nature.
Option C
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What are three disadvantages of visible light
Answer:
Eye Health Problems.
Vision-Related Accidents.
Deterioration of Materials.
Explanation:
a
a
4. Suppose the temperature inside a sealed container increases. How do you
expect this change to affect the partial pressure of each gas in a mixture of
gases inside the container? How does it affect the total pressure?
Answer:
The volume of the system will change and maybe the shape of the system boundary
Suppose a balloon contains a mixture of helium nitrogen and oxygen gas is a pressure exerted by the mixture is 101.2 KPA the partial pressure of helium is 80.1 KPA and the part of coal pressure of nitrogen is 16.2 KPA what is the partial pressure of oxygen in the balloon
giving lots of points
Answer:
4.9 kPa
Explanation:
Dalton's law of partial pressures states that the total pressure of a mixture of gases is the sum of the partial pressures of the individual gases.
In other words:
[tex]\displaystyle P_T = P_\text{O$_2$} + P_\text{N$_2$} + P_\text{He}[/tex]
The total pressure is 101.1 kPa. The partial pressure of He is 80.1 kPa. The partial pressure of N₂ is 16.2 kPa. Substitute and solve for O₂:
[tex]\displaystyle \begin{aligned} (101.2\text{ kPa}) & = P_\text{O$_2$} + (16.2\text{ kPa}) + (80.1\text{ kPa}) \\ \\ P_\text{O$_2$} & = 4.9\text{ kPa}\end{aligned}[/tex]
In conclusion, the partial pressure of oxygen in the balloon is 4.9 kPa.
The pressure needed to pump blood back to the heart is produced by the _____.
A. body muscles
B. contracting arteries
C. heart
Answer:
A. body muscles
The pressure needed to pump blood back to the heart is produced by the body muscles .
Write a two to four sentence conclusion statement explaining how the potential energy diagram is used to identify if the reaction is endothermic or exothermic, if heat was released or absorbed, and why the sign of enthalpy change was positive of negative. There should be a conclusion statement for each graph.
Answer:
The Heat of a reaction is given as the heat content/heat of formation/enthalpies of the products minus the heat content/heat of formation/enthalpies of the reactants. If the potential energy diagram has the product(s) having a higher potential energy than the reactant(s), then the reaction is an endothermic reaction (this is why the reaction absorbs heat from the surroundings to try to make up for the lack of potential energy of the reactants) and the sign on the enthalpy change is visibly positive since H(products) > H(reactants) If the potential energy diagram has the reactant(s) having a higher potential energy than the product(s), then the reaction is an exothermic reaction (this is why the reaction releases heat to the surroundings to try to take care of the higher potential energy of the reactants) and the sign on the enthalpy change is visibly negative since H(reactants) > H(products).
Explanation:
hope it helps:)
The diagram below shows the branching tree diagram for humans. The text box below it shows the set of derived shared characteristics for the branching tree.
A slanting, horizontal line is shown. On the extreme left, there is a label that says Common Ancestor. Along the slanting, horizontal line there are five dots labeled from left to right as 1, 2, 3, 4, and 5. There is one vertical line between each of the consecutive five dots. The lines are labeled from left to right as Perch, Frog, Pigeon, Rats, and Human. A text box below the branching tree diagram is labeled Derived Shared Characteristics. In the box it says from left to right, Terrestrial during all stages, Jaws, Walking on two legs, Mammary glands and hair, and Four limbs.
Look at the possible derived shared characteristics, shown in the text box. Think about where these should be placed along the branching tree diagram. From the text box, select a shared derived characteristic that humans and rats have. Explain why you think humans and rats share this characteristic.
Answer:
I would write "terrestrial/lives on land during all life stages" between the frog and pigeon branches
Explanation:
Jaw evolution has started with fish, so i'd place that before the perch, evolution of four limbs is next and I would plate it between the perch and the frog. Evolution of an egg has ensured that organisms remain terrestrial during all stages of life and don't need to rely on water to lay their eggs. So I would place that between the frog and the pigeon. True mammary glands and true hair, as we know it formed on mammals so i'd place that between the pigeon and the rats (although synapsids evolved similar structures long before birds even existed). And lastly, I would place "walking on two legs" between rats and human branches. Because our ancestors evolved bipedalism relatively late.
Calculate the power developed in R1.
P1 =_____watts
48
190
240
1300
the answer will be 190
Explanation:
because R1= 0.5*0.5*8
=190
Which of the following diagrams represents a single
replacement reaction?
Answer: A
Explanation:
trust me i did it
What are the types of precipitation?
Select four correct answers.
(1) dew
(2) hail
(3) wind
(4) rain
(5) sleet
(6) fog
(7) snow
(I might answer it by myself so be quick)
Answer:
Rain,Hail,Snow,sleet. Hope this helped you out!
(9) Which is true from the following ?
(A) Size of A1+ < Size of Al (B) Size of A1+ > Size of Al
(C) Size of F < Size of F (D) Size of Nat = Size of Na
(10) For which element the highest shielding effect for outermost electron is observed ?
(A) Element of group 13 and period 2 (B) Element of group 13 and period 3
(C) Element of group 13 and period 4 (D) Element of group 13 and period 5
(11) Which one is the descending order of atomic radius of elements of third period.
Na(Z = 11), Mg (Z = 12), Al (Z = 13) and Si(Z = 14) ?
(A) Si > Al > Mg > Na (B) Na > Mg > Al > Si
(C) Na < Mg < Al < Si (D) Na > Al > Mg >Si
(12) Which order is true with reference to size of species ?
(A) Pb < Pb2+ < Pb++
(B) Pb4! > Pb2+ > Pb
(C) Pb > Pb2+ > Pb4+
(D) Pb2+ < Pb < Pb4+
Answer:
The correct answer is A and D.
Explanation:
Please I want brainliest.
Reason:
The size of the ions follows the order:
Negatively charged ion > Neutral atom >
Positively charged ion
This is because of the size of ions increases when the electrons are added to the outermost shell of an atom.
This happens due to the increase in
electron-electron repulsion.
Moreover, when the electrons are removed from an atom, then the affective nuclear charge that is experienced by the outermost electron increases.
Thus the size of the positively charged ion is least.
The Ksp of barium sulfate (BaSO4) is 1.1 × 10–10. What is the solubility concentration of sulfate ions in a saturated solution at 25°C?
1.5 × 10–5M
1.0 × 10–5M
5.5 × 10–11M
7.4 × 10–6M
Answer:
Your answer would be:
B.) 1.0 × 10–5M
Explanation:
Have a great rest of your day
#TheWizzer
Answer:
The answer is B.
Explanation:
pretty quite, when everyones acc gets deleted SMH -;-
carbon monoxide reacts with iron (ii, iii) oxide (fe3o4) making iron and carbon dioxide. when a student performed the experiment she reacted 70.0 g of fe3o4 with 70.0 g of co and the actual yield of iron was 41.9. calculate the percentage yield.
Please help me!
The percent yiled shows the extent of conversion of reactants to products. The percent yiled here is 83.1%.
Percent yieldThe percent yiled in a reaction is calculated as te ratio of the actual yield to the theoretical yiled multiplied by 100.
Hence the balanced reaction equation is; Fe3O4 + 4CO → 3Fe + 4CO2.
Number of moles of Fe3O4 = 70.0 g/232 g/mol = 0.3 moles
Number of moles of CO = 70.0 g/28 g/mol = 2.5 moles
If 1 mole of Fe3O4 reacts with 4 moles of CO
x moles of Fe3O4 reacts with 2.5 moles of CO
x = 0.6 moles
Hence, Fe3O4 is the limiting reactant.
Now;
1 mole of Fe3O4 yileds 3 moles of Fe
0.3 moles of Fe3O4 yileds 0.3 moles * 3 moles/1 mole = 0.9 moles
Mass of Fe produced = 0.9 moles * 56 g/mol = 50.4 g
Percent yield = 41.9 g/ 50.4 g * 100/1 = 83.1%
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Note 3 key dates in blood spatter history and what those dates mean to evidence today
The question relates to Blood Splatter Analysis and relates to both law and Forensic science.
What are the three key dates in Blood Splatter History?
The three key dates in Blood Splatter History and what those dates mean to evidence today are:
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If the carbon atom of each of the incoming CO2 molecules is labeled with a radioactive isotope of carbon, which organic molecules will be radioactively labeled after one cycle
Answer:
B, C, D, and E
Explanation:
WILL GIVE BRAINLIEST PLEASE HELP! What is the pH of a solution with a concentration of hydronium ions of 8.42 × 10–5?
Answer:
[tex]pH = -log(H3O^+) = -log(8.52E-5) = 4.+[/tex], my guess is about 4.1
Explanation:
hope this helps! :)