The molarity of a CaCl₂ solution that is prepared by dissolving 27.1 g of CaCl₂ in sufficient water to give 779 mL of solution is 0.31M.
How to calculate molarity?Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.
The molarity of a substance can be calculated by dividing the number of moles of the substance by the volume.
According to this question, 27.1 g of CaCl₂ is dissolved in sufficient water. The number of moles can be calculated as follows:
moles = 27.1g ÷ 110.98 g/mol
moles = 0.24mol
Molarity of CaCl₂ = 0.24mol ÷ 0.779L
Molarity of CaCl₂ = 0.31M
Therefore, 0.31M is the concentration required to prepare by dissolving 27.1 g of CaCl₂ in sufficient water.
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HN5O3+Mg reaccion de sustitucion sencilla
Responder por favor lo necesito rapido
The balanced equation of the reaction could be written as; [tex]HN_{5} O_{3} + Mg ------ > MgO + HNO_{3}[/tex]
What is a reaction?We know that in chemistry, the term reaction has to do with the combination of two or more species to give a product. Now the process of the reaction would alter the chemical composition of the reactants as we move on the way to get the ne substances called the products. There would be a breaking down of the bonds that holds the reactant molecules together and then there is a recombination of the atoms in a different way so as to obtain the products of the reaction. This is how a chemical reaction takes place in a given system.
In this case we have the oxidation of the compound called [tex]HN_{5} O_{3}[/tex]. In this case, the compound is actually being oxidized as we can see from the process that would be shown in the reaction equation accurately.
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Based on the image above of Silver from the periodic table, which isotope would be the most abundant?
109
or
107
Based on the image above of Silver from the periodic table, the isotope that would be the most abundant is Ag-107.
What are isotopes?Isotopes are atoms of the same element that differ from each other by their mass.
The difference in the mass of isotopes of elements is due to the difference in the number of neutrons in the nucleus.
The relative atomic mass of an element is the sum of the isotopic mass and relative abundances of the isotopes.
The relative atomic mass of an element is closer to the value of the isotope with the greatest relative abundance.
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When 0.384 g of sodium metal is added to an excess of hydrochloric acid, 3990 J of heat are produced. What is the enthalpy of the reaction as written?
The enthalpy of the reaction when 0.384 g of sodium metal is added to an excess of hydrochloric acid and 3990 J of heat is produced is 266 KJ.
The balanced chemical equation of reaction is -
2 Na(s) + 2 HCl(aq) ⟶ 2 NaCl(aq) + H₂(g)
We know that,
weight of sodium metal is 0.384 g
Molar mass of Na is 23 g/mol
we will calculate the number of moles,
Number of moles = Given mass
Molar mass
Moles of Na = 0.348 g = 0.015 mol
23 g/mol
We will calculate the energy in 1 mole of sodium metal
In 0.015 moles of sodium metal, 3990 J of energy is produced.
so, in 1 mole of sodium metal, 3990 J of energy is produced
0.015
In 1 mole, 266000 J of energy is produced.
1 J = 0.001 KJ
266000 J = 266 KJ
The enthalpy of the reaction will be 266 KJ.
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How many grams of solute are present in 445 mL of 0.660 M KBr?
Answer: 34.951 g of KBr is the amount in 445mL of .660M KBr.
Explanation: The solute is what is dissolved in the solvent. In this case the solute is KBr. The Molecular weight of KBr is 119.002g
Molarity = n/V, so .660 M = x moles/1L, so it's .660 moles/L.
.660 mol KBr x 119.002 g KBr/1 mole KBr = 78.541 grams of KBr in one mole of KBr.
78.541 g KBr/1 mol KBr = X g of KBr/0.445 L KBr cross multiply and divide to get grams of KBr in 445mL (which is the same as 0.445 L
Therefore, 34.951 g of KBr is the amount in 445mL of .660M KBr.
On a phase diagram what does the triple point represent?
The conditions of the pressure and the temperature where all the phases coexists.
Explanations:A phase diagram is a diagram that shows the point where all the phases of matter coexists at equilibrium. This phase digram consists of the melting-freezing line, sublimation-deposition line and the
The point where all these lines coexists in equilibrium or intersects is known as the triple point.
he triple point is as marked in the diagram below;
electronic configuration of Lithium
The electronic configuration of Lithium is 1s²2s¹.
Which encoding is utilized to represent the arrangement of the lithium electrons?The configuration notation allows scientists to clearly describe and record how electrons are positioned around an atom's nucleus. As a result, it is simpler to comprehend and anticipate how atoms will interact to create chemical bonds.
Lithium is the third element with a total of three electrons. We shall describe the lithium electron configuration with the first two electrons in the 1s orbital. Li's third electron is in the 2s orbital since there can only be two electrons in the 1s orbital. Therefore, Li's electron configuration will be 1s22s1.
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Which of the following statements is NOT true concerning the decomposition of a simple binarycompound?A) The products are unpredictable.B)The products are the constituent elements.C)Energy is usually required.D)The reactant could be an ionic or a molecular compound.E) The reactant is a single substance
Step 1 -
A decomposition reaction is a reaction in which a compound is decomposed, i.e., we usually heat a substance thus forming new substances, such as gaseous substances.
Generally speaking, a decomposition reaction will involve only one reactant: the substance to be decomposed.
[tex]\text{reactant}\to\text{ product 1 + product 2 + }\ldots[/tex]Step 2 - Examples of decomposition reactions
Let's take a closer look at some examples:
[tex]\begin{gathered} ZnCO_3\to ZnO+CO_2 \\ 2Al_2O_3\to4Al+3O_2 \\ H_2CO_3\to H_2O_{}+CO_2 \\ NH_4NO_3\to N_2O+2H_2O \end{gathered}[/tex]We can already state some conclusions:
a) The products are not always the same. They depend on the reactant. Therefore, they are not always predictable.
b) The reactant can be an ionic compound (such as ZnCO3) but also a covalent compound (such as H2CO3).
c) The reactant does not decompose into its constituent elements.
Step 3 - Finding the wrong answer
Therefore, the only wrong answer is item b), the products are the constituent elements.
The engine of a Ferrari F355 F1 sports car takes in air at 20.0 ∘C and 1.00 atm and compresses it adiabatically to 0.0900 times the original volume. The air may be treated as an ideal gas with γ=1.40
1) find the final temperature
2) find the final pressure
1. The final temperature is 768 Kelvin.
2. the final pressure is 29.1 atm
What is temperature?Temperature is described as a physical quantity that expresses the hotness of matter or radiation.
We will use the equations of the adiabatic process:
Pressure is described as the force applied perpendicular to the surface of an object per unit area over which that force is distributed.
P11 ^ = P22
P2 = P1 (12)^
1.00 atm = (1/ 0.09)^ 7/5
P2 = 29.1 atm.
2 = 1 (1/2)−1
T2 = = 293 K ( 1 / 0.09)^ (7/5)^−1
T2 = 768 kelvin
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A scientist conducted an experiment to determine how the amount of salt in a body of
water affects the number of plants that can live in the water. What is the independent
(testing) variable?
the amount of water
the time it took for the plants to grow
the number of plants
O the amount of salt
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The number of plants in the water is the independent (testing) variable.
What may be altered during an experiment?Anything that may vary or be altered is considered a variable. In other words, it is any factor in an experiment that may be modified, controlled for, or assessed.
Scientists cannot ascribe changes or discrepancies in outcomes to a single source when more than one variable is altered in an experiment. The outcomes may be directly ascribed to the independent variable by looking at and modifying one variable at a time.
What variables are changeable or manipulable?In an experiment, the independent variable is a manipulated variable. It's termed "manipulated" because it can be changed. In other words, you may choose whether to raise or reduce it ahead of time.
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Why is this on hear if people give you the wrong answers?!?
Answer:
I don't know but I do know that you need grammarly.
Explanation:
This sentence is grammatically correct, but its wordy, and hard to read.
look at the picture
peter measured the height of a plant five times. He recorded the following results: 15.5 cm, 19.4 cm, 15.6 cm, 15.8 cm, 15.9 cm. which of the measurements is the least precise?
Peter measured the height of a plant five times then the measurements is the least precise is 15.5 cm
Measurement precision is the numerically using measure of imprecision as that standard deviation then calculated from the result by carrying replicate measurement and here given measurements are 15.5 cm, 19.4 cm, 15.6 cm, 15.8 cm, 15.9 cm and in that measurements the least precise are 15.5 cm
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orbital diagrams Mo6+
The orbital diagram of Mo+6 show the number of paired and unpaired electrons of the ion.
What is an orbital diagram?An orbital diagram is defined as the type of diagram that shows the paired and unpaired electrons of an element or an ion.
The given element is known as molybdenum (Mo) with the atomic number of 42.
The ionic molybdenum (Mo+6) contains only 36 electrons as 6 electrons has been donated out.The ion given = Mo+6
The orbital diagram is as follows:
1s²= ¶¶
2s²= ¶¶
2p⁶=¶¶ ¶¶ ¶¶
3s²= ¶¶
3p⁶= ¶¶ ¶¶ ¶¶
3d¹⁰= ¶¶ ¶¶ ¶¶ ¶¶ ¶¶
4s²= ¶¶
4p⁶= ¶¶ ¶¶ ¶¶
The symbol ¶ is used to show the number of electrons in each ground state of the given ion.
In order words, the summary of electronic configuration of Mo+6 =
1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶
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A reaction vessel initially contains 3.00 atm of A and 1.00 atm of B. A reaction occurs according to the equation:
2A(g) + B(g) ⇄ 2 C(g)
When equilibrium is reached, the total pressure is found to be 3.10 atm. What is the equilibrium constant Kp?
Enter your response rounded to three significant figures using decimal notation.
The equilibrium constant Kp of the reaction is 0.334 .
What is the equilibrium constant Kp?The equilibrium constant Kp is calculated as follows;
Equation of reaction: 2A(g) + B(g) ⇄ 2 C(g)
Using an ICE table
A B C
I 3.00 atm 1.00 atm 0.00 atm
C - 2x atm - x atm + 2x atm
E (3.00 - 2x) atm (1.00 - x )atm 2x atm
Total pressure = 3.10 atm
Initial pressure of A = 3.00 atm
Initil pressure of B = 1.00 atm
(3.00 - 2x) atm + (1.00 - x ) + (0.00 + 2x) atm = 3.10 atm
4.00 - 2x atm = 3.10 atm
-2x atm = -0.90 atm
x = 0.45 atm
2x = 0.90 atm
C = 0.90 atm
B = 1.00 - 0.45 = 0.55 atm
A = 3.00 - 0.90 = 2.10 atm
Kp = [C]² / [A]² * [B]
Kp = 0.90² / 2.10² * 0.55
Kp = 0.334
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Scientists are monitoring a volcano. The table summarizes their data for one week.
Instrument
What Was
Monitored
Tiltmeter change in slope
Seismograph seismic waves
Satellite
emitted gases
Observation
no change
seismic activity is at background level
images show no emissions of gas or ash
Based on the data table, which inference best describes the volcano?
A. An eruption in the near future is unlikely.
B. An eruption in the near future is confirmed.
C. An eruption in the near future is impossible.
D. An eruption in the near future is somewhat likely.
According to the given statement the volcano an eruption in the near future is confirmed.
The correct option is B.
What are volcanic eruptions?An eruption occurs whenever lava and gas are expelled from a volcano, frequently in an explosive manner. The most hazardous sort of eruption is known as a "glowing landslide," which happens when freshly erupted lava rolls down a volcano's flanks. They can move faster and efficiently heats of 1,200 degrees F.
What causes on eruptions?Due to the extreme heat found deep within the Earth, certain rocks gradually melt and condense into lava. Magna chambers are places where magma rises and collects because it is lighter than that of the solid rock around it. Eventually, some of the lava rushes through cracks and vents to the Earth's crust.
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A 1.40 L buffer solution consists of 0.310 M propanoic acid and 0.111 M sodium propanoate. Calculate the pH of the solution following the addition of 0.073 mol HCl . Assume that any contribution of the HCl to the volume of the solution is negligible. The a of propanoic acid is 1.34×10−5 .
The pH of the buffer after adding HCl is 4.08.
What is pH of a solution?The pH of a solution is the negative logarithm of the hydrogen ion concentration of the solution.
pH = -log [H⁺]The pH of a buffer solution is calculated using the Henderson-Hasselbalch equation shown below:
pH = pKa + log (base/acid)
pKa of the acid is calculated as follows:
pKa = - log Ka
Ka of propanoic acid = 1.34 × 10⁻⁵
pKa = - log 1.34 × 10⁻⁵
pKa = 4.87
Initial moles of acid = 0.310 × 1.40 = 0.434
Initial moles of base = 0.111 × 1.40 = 0.155
0.073 mole of HCl is added to the buffer
moles of base after reacting with HCl = 0.155 - 0.073 = 0.082
moles of acid after addition of HCl = 0.434 + 0.073 = 0.507
The pH of the buffer after adding HCl will be:
pH = 4.87 + log(0.082/0.507)
pH = 4.87 - 0.79
pH = 4.08
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10. The exhaust from a car contains
used. Scientists often refer to this energy that cannot be used as waste energy.
Answer:
Thermal energy
Explanation:
The exhaust from a car that cannot be used is called thermal energy since it's impossible to reuse its energy.
The exhaust from a car contains thermal energy used. Scientists often refer to thermal energy that cannot be used as waste energy.
What is thermal energy?
Thermal energy is defined as a type of energy which is contained within a system which is responsible for temperature rise.Heat is a type of thermal energy.It is concerned with the first law of thermodynamics.
Thermal energy arises from friction and drag.It includes the internal energy or enthalpy of a body of matter and radiation.It is related to internal energy and heat .It arises when a substance whose molecules or atoms are vibrating faster.
These vibrating molecules and atoms collide and as a result of which heat is generated in a substance , more the collision of particles , higher is the thermal energy.
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How many grams of MgCl2 would be needed to make 2.3 liters of a 0.33 molar solution? Round your answer to the nearest 0.01, and remember to include both units (properly abbreviated) and substance.
Using the following equation:
[tex]M=\frac{n}{L}[/tex]Where M represents the concentration (Molarity), n represents the number of moles of solute and L represents the liters of solution.
If we replace the values of the problem:
[tex]0.33M=\frac{n}{2.3L}\to n=0.33M\cdot2.3L\to n=0.759molesMgCl_2[/tex]To find the number of grams, what we do is to multiply by the molar mass of MgCl2, which is 95.211g:
[tex]0.759molesMgCl_2\cdot\frac{^{}95.211gMgCl_2}{1molesMgCl_2}=72.26gMgCl_2[/tex]Therefore, 72.26gMgCl2 are needed.
An ideal gas (which is is a hypothetical gas that conforms to the laws governing gas behavior) confined to a container with a massless piston at the top. (Figure 2) A massless wire is attached to the piston. When an external pressure of 2.00 atm is applied to the wire, the gas compresses from 5.90 to 2.95 L . When the external pressure is increased to 2.50 atm , the gas further compresses from 2.95 to 2.36 L .
In a separate experiment with the same initial conditions, a pressure of 2.50 atm was applied to the ideal gas, decreasing its volume from 5.90 to 2.36 L in one step.
If the final temperature was the same for both processes, what is the difference between q for the two-step process and q for the one-step process in joules?
Express your answer with the appropriate units
The difference that we can obtain for the calculation of the two step and the one step process is -150 J
What is the first law of thermodynamics?In general, the study of heat is what we generally refer to as thermodynamics. Recall that heat has a number of visible effects on a substance such as the increase in the temperature of the substance as well as a change in the state of the substance.
With this in mind, let us try to obtain the heat for the two step process as well as in the one step process as we can see from the question that we have before us just above in this context.
For the first part of the two step process, the heat is obtained from;
q = p dV
q = 2.00 atm (2.95 L - 5.90) = -5.9 atm L or -598 J
For the second step of the two step process
q = 2.5 (2.36 L - 2.95) = -149 J
Total heat for the two step process = -598 J + (-149 J) = -747 J
The value of the heat from the one step process is obtained as;
q = 2.5(2.36 L - 5.90L)
q = -897 J
Difference between q for the two-step process and q for the one-step process in joules;
-897 J - ( -747 J) = -150 J
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What is the pH of the solution obtained when 135 mL of 0.616 M NaOH is diluted to 16.0 L with water?
Express your answer using two decimal places.
The pH of a solution obtained when 135mL of 0.616 M NaOH is diluted to 16.0 L with water is 2.28.
How to calculate pH?The pH of a solution is the degree of acidity or alkalinity of a solution.
The pH of a solution can be calculated by using the following equation;
pH = - log {H+}
However, the molarity or concentration of the NaOH solution must first be calculated as follows:
C₁V₁ = C₂V₂
Where;
C₁ = initial concentrationV₁ = initial volumeC₂ = final concentrationV₂ = final volume135 × 0.616 = C × 16000
83.16 = 16000C
C = 0.0052M
pH of NaOH = - log {0.0052}
pH = 2.28
Therefore, the pH of the NaOH solution is 2.28.
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Is it possible to predict whether a precipitate will likely be white or a color other than white based on the position of the cation's element in the periodic table? Refer to a periodic table and the compiled data of the different teams with regard to the precipitate color of the cations that reacted to support your conclusion.
Is it possible to predict whether a precipitate will likely be white or a color other than white based on the position of the cation's element in the periodic table then the precipitate is determined by qualitative analysis
Precipitation is the formation of a solid in a solution or inside another solid during a chemical reaction or by diffusion in a solid
Here the composition of relatively complex mixture of metal ion can be determined by using qualitative analysis then in group 1 there are insoluble chlorides in that most metal chloride salt are soluble in water and if no precipitate is form then this cation are not present in significant amount and when white precipitate is formed by the solution of AgNO₃ is added to an acidified unknown solution then white precipitate indicate that presence of Cl⁻ ions whereas all chromates are usually yellow orange or red precipitate
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What type of energy is stored in the bonds of chemical compounds?
chemical energy
compound energy
element energy
kinetic energy
Answer: Chemical energy
Explanation:
Answer:
a
Explanation:
Write the balanced net ionic equation for the reaction when aqueous (NH4)3PO4 and the a queso us Zn(NO3)2 are mixed in solution to form solid Zn3(PO4) and aqueous NH4NO3. Be sure to include the proper phases for all species within the reaction
The net ionic equation for the reaction between aqueous (NH₄)₃PO₄ and aqueous Zn(NO₃)₂ to form solid Zn₃(PO₄)₂ and aqueous NH₄NO₃ is:
PO₄³⁻ (aq) + Zn²⁺ (aq) ----> Zn₃(PO₄)₂ (s)What are net ionic equations?Net ionic equations are equations that show only the reactant ions that are involved in the formation of a non-ionic product.
In a net ionic equation, the spectator ions or the ions which appear on both sides of the reaction are eliminated.
Considering the given reaction between aqueous (NH₄)₃PO₄ and aqueous Zn(NO₃)₂ to form solid Zn₃(PO₄)₂ and aqueous NH₄NO₃:
The molecular equation is given below:
(NH₄)₃PO₄ (aq) + Zn(NO₃)₂ (aq) ----> Zn₃(PO₄)₂ (s) + NH₄NO₃ (aq)
The net ionic equation is:
PO₄³⁻ (aq) + Zn²⁺ (aq) ----> Zn₃(PO₄)₂ (s)
The product Zn₃(PO₄)₂ is insoluble and is obtained as a precipitate.
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a society decides that it needs to produce more corn to feed the growing population what must it do before it begins the production process
The transformation of inputs into outputs is referred to as the production process.
What is meant by the production process?
A production process is a way to use economic resources, such as labor, expensive machinery, or land, to create goods and services for customers.
The transformation of inputs into outputs is referred to as the production process. The primary categories include mass, batch, job, just-in-time, and flexible manufacturing systems.
A production process is a method of delivering goods and services to clients while utilizing resources or economic inputs like labor, expensive machinery, or land.
Therefore, the correct answer is option A. analyze existing resources, such as water availability
The complete question is:
Society decides that it needs to produce more corn to feed the growing population. What must it do before it begins the production process?
A. analyze existing resources, such as water availability
B. determine how people will receive the surplus crops
C. study the profitability of increasing corn production
D. understand who is in a position of authority to produce more
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what is the weight in remaining oranges
You mix a solution with 17.1 grams NaCl, 29.8 grams NaHCO3, and 105 grams of water. What is the mass percent of NaCl in this solution?
Answer:
45.2662%
Explanation:
The sum of the chemicals (sodium chloride) and (Baking powder) and (water) is 151.9, The Salt(sodium chloride) is 29.8 grams and as a percent is 0.298%. 151.9x0.298=45.2662%, happy to help any other time!
Recycling of Carbon Quick Check
Pyrolysis is the most popular recycling method for recovering carbon fiber from composite trash because it essentially burns off the resin at high temperatures.
It has long been asserted that solvolysis, which dissolves the resin using a solvent, offers superior qualities.
What are the carbon cycle's seven steps?The Cycle of Carbon
Plants absorb carbon from the atmosphere.
Animals and plants both absorb carbon.
Animals and vegetation release carbon into the soil.
Living beings release carbon into the atmosphere.
When fuels are burned, carbon is released from fossil fuels into the atmosphere.
Oceans receive carbon from the atmosphere.
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What can you say about the concentration of H+ ions and OH- ions in a solution that has a pH of 5?
A. A solution that has a pH of 5 has more hydrogen ions than hydroxide ions.
B. If you were to add an acid (hydrogen ion) to water, then the equilibrium shifts to the
left, and the hydroxide ion concentration decreases. Since the pH of 5 is very acidic
then the hydroxide ion basically just balances everything out.
C. It can be inferred that when dealing with a pH of 5, you are dealing with acid.
(I'm not sure if I should pick A or C. Help is needed asap and I appreciate it)
The concentration of hydrogen ions [H⁺] ions is 10⁻⁵ and hydroxide ions [OH⁻] ions is 10⁻⁹ in a solution of pH of 5. A) a solution that has a pH of 5 has more hydrogen ions than hydroxide ions.
C)when dealing with pH of 5, you are dealing with acid.
pH = - log [H⁺]
pH is given = 5
therefore,
5 = - log [H⁺]
[H⁺] = 10⁻⁵
now, [H⁺] [OH⁻] = 10⁻¹⁴
10⁻⁵ [OH⁻] = 10⁻¹⁴
[OH⁻] = 10⁻⁹
A solution that has pH below 7 is acidic solution with higher hydrogen ion concentration.
Thus, The concentration of hydrogen ions [H⁺] ions is 10⁻⁵ and hydroxide ions [OH⁻] ions is 10⁻⁹ in a solution of pH of 5. A) a solution that has a pH of 5 has more hydrogen ions than hydroxide ions.
C)when dealing with pH of 5, you are dealing with acid.
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To test the effectiveness of a new nutrient supplement one group of identical mice is given the supplement and the other group is not given any thing .which is the most complete list of the parts of the
experiment presented in this scenario.
The most complete list of the parts of the experiment presented in this scenario include:
Dependent variableExperimental groupControl group.What is Experiment?This refers to the procedures which are performed in other to support or refute a hypothesis. It is also used to ascertain the authenticity of the claim by other people such as scientists etc who review it.
In the scenario given, we were told that the group of identical mice is given the supplement and the other group is not given any thing which means that the control group is the one which wasn't given anything while the ones who were given something is the experimental group.
The dependent variable is the supplement which was given to the mice and is therefore the reason why option B was chosen as the correct choice.
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6)
Which of the following will be least soluble in water?
A) Potassium sulfate, K₂SO4
B) Ammonium nitrate, NH4NO3
C) Chloromethane, CH3CI
D) Calcium chloride, CaCl2
E) Ethanol, C₂H6O
Answer: D
Explanation: calcium chloride doesn't have any hydrogen bonds, it's most soluble in alcohol.