Answer:
d
Explanation:
because that in or out I don't know
Which of the following is an organic moleclue ?
Answer:
water
Explanation:
What is the significance of Plato’s problem of “saving the appearances” to the scientific mindset of the philosophers and Differentiate geocentric from heliocentric model of the universe.
Answer:
If it started with Plato or a little later, the job for Greek Astronomers employed as the platonic tradition was, correctly or incorrectly, to save appearances: obviously to describe, in a mixture of uniform circular motions, irregular motion observed by senses.
Explanation:
Which molecule has weakest bond?
Answer:
ionic bonds are the weakest bonds
Explanation:
state two applications of simple distillation of separating mixture
Answer:
Purify drinking water of unwanted
chemicals andminerals such as salt.Hope this helps! :D
Which example of regeneration is also considered reproduction?
Explanation:
Regeneration is a type of asexual reproduction in which the organism is capable of regrowing certain body parts.
Answer: Regeneration is defined as organism's ability to regrow damaged or lost body parts. It is a type of asexual reproduction which is shown by many fully differentiated organisms. Organism such as Hydra uses regenerative cells for reproduction in the process of budding. The young Hydra gets its nourishment from the parent.
Explanation:
2.0 L of oxygen gas and 8.0 L of nitrogen gas at STP are mixed together. The gaseous mixture is compressed to occupy 2.0 L at 298 K. What is the pressure exerted by this mixture?
Answer:
5.5 atm
Explanation:
Step 1: Calculate the moles in 2.0 L of oxygen at STP
At STP, 1 mole of an ideal gas occupies 22.4 L.
2.0 L × 1 mol/22.4 L = 0.089 mol
Step 2: Calculate the moles in 8.0 L of nitrogen at STP
At STP, 1 mole of an ideal gas occupies 22.4 L.
8.0 L × 1 mol/22.4 L = 0.36 mol
Step 3: Calculate the total number of moles of the mixture
n = 0.089 mol + 0.36 mol = 0.45 mol
Step 4: Calculate the pressure exerted by the mixture
We will use the ideal gas equation.
P × V = n × R × T
P = n × R × T / V
P = 0.45 mol × (0.0821 atm.L/mol.K) × 298 K / 2.0 L = 5.5 atm
Predict whether ΔS for each reaction would be greater than zero, less than zero, or too close to zero to decide:
1. I2(g) + Cl2(g) → 2ICl
2. 2NH3(g) →N2(g) + 3H2(g)
3. CO2(g) + H2(g) → CO(g) + H2O(g)
4. 2CO(g) + 2NO(g) → 2CO2(g) + N2
(g) 5. 2H2O2(l) →2H2O(l) + O2(g)
Answer: 1). [tex]I_{2}(g) + Cl_{2}(g) \rightarrow 2ICl(g)[/tex] has [tex]\Delta S = 0[/tex].
2). [tex]2NH_{3}(g) \rightarrow N_{2}(g) + 3H_{2}(g)[/tex] has [tex]\Delta S > 0[/tex].
3). [tex]CO_{2}(g) + H_{2}(g) \rightarrow CO(g) + H_{2}O(g)[/tex] has [tex]\Delta S = 0[/tex].
4). [tex]2CO(g) + 2NO(g) \rightarrow 2CO_{2}(g) + N_{2}(g)[/tex] has [tex]\Delta S < 0[/tex].
5). [tex]2H_{2}O_{2}(l) \rightarrow 2H_{2}O(l) + O_{2}(g)[/tex] has [tex]\Delta S > 0[/tex].
Explanation:
Entropy is the increase in degree of randomness of a substance. When a solid is converted into liquid then disorderness among the molecules of a substance increases.
As a result, entropy increases when a solid state converts into a liquid state.
Similarly, when a liquid state converts into gaseous state then molecules move more randomly from one place to another. Hence, entropy further increases when solid or liquid state of substance changes into gaseous state.
1). [tex]I_{2}(g) + Cl_{2}(g) \rightarrow 2ICl(g)[/tex]
This shows that 2 gaseous reactants are giving 2 gaseous product. So, entropy will remain the same. Hence, [tex]\Delta S = 0[/tex] for this reaction.
2). [tex]2NH_{3}(g) \rightarrow N_{2}(g) + 3H_{2}(g)[/tex]
Here, 2 moles of ammonia gas is giving 4 moles of gaseous products. This means that number of gaseous moles are increasing. So, entropy will increase and therefore, [tex]\Delta S > 0[/tex].
3). [tex]CO_{2}(g) + H_{2}(g) \rightarrow CO(g) + H_{2}O(g)[/tex]
Here, 2 moles of gaseous reactants are giving 2 moles of gaseous products . So, there is no increase in number of gaseous moles therefore, [tex]\Delta S = 0[/tex].
4). [tex]2CO(g) + 2NO(g) \rightarrow 2CO_{2}(g) + N_{2}(g)[/tex]
Here, total 4 moles of gaseous reactants are giving total 3 moles of gaseous products. This means a decrease in number of moles is taking place. Hence, entropy is decreasing and therefore, [tex]\Delta S < 0[/tex].
5). [tex]2H_{2}O_{2}(l) \rightarrow 2H_{2}O(l) + O_{2}(g)[/tex]
Here, 2 moles of reactants are giving total 3 moles of products. This means that an increase in number of moles is taking place. So, entropy will increase therefore, [tex]\Delta S > 0[/tex].
Explain the term pycnocline
Answer:
It is a Cline or layer where density gradient is greatest within a body of water
What is the scientific method?
O A. A book describing scientific experiments
B. A description of proper laboratory techniques
O C. A scientific approach to answering questions
D. A way of thinking about scientific problems
Answer:
C.A scientific approach to answering questions
Explanation:
Therefore, the independent variable was _____ and the dependent variable was _____
sugar concentration
pressure
solubility
temperature
Answer:
temperature and solubility
Explanation:
In the experiment where we are testing the solubility of sugar at different temperatures and pressure, the dependant variable is the solubility and the independent variables are the temperature, pressure and sugar concentration.
What is independent variables ?Independent variables in an experiment is the variables which does not depends on any other variables and on which we can have access or control.
Dependant variables are dependant on the independent variables and they change with respect to the change in independent variables. On dependant variables are those which we are studying and can have no direct control over it,
In the solubility measurement, solubility is the dependant variable and the we are measuring it under different conditions that are the independent variables such as temperature, pressure, sugar concentration etc.
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How much heat will be absorbed by a 26.3 g piece of aluminum (specific heat = 0.930 J/g･°C) as it changes temperature from 23.0°C to 67.0°C?
Answer:
[tex]\boxed {\boxed {\sf 1076.196 \ Joules}}[/tex]
Explanation:
Since we are given the mass, specific heat, and temperature, we should use the following formula for heat energy.
[tex]q=mc\Delta T[/tex]
The mass of the aluminum is 26.3 grams. Its specific heat is 0.930 Joules per gram degree Celsius. We need to find the change in temperature.
The change in temperature is the difference between the initial temperature to the final temperature. The temperature changes from 23.0°C to 67.0°C, so the initial is 23 degrees and the final is 67 degrees. ΔT= final temperature - initial temperature ΔT= 67°C - 23°C ΔT= 44°CNow we know all the values.
m= 26.3 g c= 0.930 J/g °C ΔT= 44°CSubstitute the values into the formula.
[tex]q= (26.3 \ g}) \times (0.930 \ J/g \textdegree C) \times (44 \textdegree C)[/tex]
Multiply the first two numbers together. The units of grams cancel.
[tex]q= 24.459 \ J/ \textdegree C \times 44 \textdegree C[/tex]
Multiply again. This time, the units of degrees Celsius cancel.
[tex]q=1076.196 \ J[/tex]
1076.196 Joules of heat will be absorbed by the piece of aluminum.
Which type of molecule is shown below? I CH3 C=C H CH3 O A. Alkene O B. Cyclic alkane O C. Alkane O D. Alkyne
Answer:
Alkene
Explanation:
Took the test.
The correct answer is Option (A) Alkene.
What is Alkene?Alkenes are the hydrocarbon which contain double bond of carbon and carbon.The general formula of alkene are CnH2n.Alkenes are unsaturated hydrocarbons. Why other options are incorrect?The other options are incorrect because the structure given in the question is C4H8. The IUPAC name of the structure is is 1- butene .The structure describes the general formula of alkene CnH2n where we can say that n= 4Hence , Option (A) is correct and rest options are incorrect.Learn more about Alkenes below
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2. What are the two types of pressure?
O Medium pressure/Extreme pressure
ebo...
Medium pressure/ Low pressure
O High pressure/Low pressure
Medium pressure/ High pressure
Answer:
O High pressure/Low pressure
Explanation:
A low pressure system has lower pressure at its center than the areas around it. Winds blow towards the low pressure, and the air rises in the atmosphere where they meet. ... A high pressure system has higher pressure at its center than the areas around it. Winds blow away from high pressure.
The two types of pressure commonly referred to are high pressure and low pressure. Therefore option 3 is correct.
High pressure/Low pressure: This option correctly identifies the two main types of pressure. High pressure refers to conditions where the pressure is greater than atmospheric pressure, such as in compressed gases or in high-pressure systems.
Low pressure refers to conditions where the pressure is less than atmospheric pressure, such as in a vacuum or in areas of low atmospheric pressure, like the center of a weather system.
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Place these elements in order of increasing ionization energy and JUSTIFY A REASON FOR THIS TREND. C Ge Pb Si Sn
Answer: The given elements are arranged in order of increasing ionization energy as Pb < Sn < Ge < Si < C.
Explanation:
The amount of energy required to remove a loosely bound electron from an isolated neutral gaseous atom is called ionization energy.
Larger is the size of an atom more easily it will lose its valence electrons. Hence, less will its ionization energy.
Whereas smaller is the size of an atom more energy will be required to pull out the electron. Hence, more will be its ionization energy.
This means that on moving down a group ionization energy decreases and on moving along a period from left to right the ionization energy decreases.
The given elements are C, Ge, Pb, Si, and Sn. All these elements belong to group 14 of the periodic table.
Therefore, these elements are arranged in order of increasing ionization energy as follows.
Pb < Sn < Ge < Si < C
Thus, we can conclude that given elements are arranged in order of increasing ionization energy as Pb < Sn < Ge < Si < C.
Find the number of grams of calcium chloride needed to prepare 500.0ml of a 4.0m solution
Answer:
222 g
Explanation:
First we convert 500.0 mL to L:
500.0 mL / 1000 = 0.500 LThen we use the definition of molarity to calculate how many calcium chloride moles are required:
Molarity = moles / litersMolarity * liters = moles4.0 M * 0.500 L = 2.00 molNow we convert 2.00 moles of calcium chloride into grams, using its molar mass:
2.00 mol * 111 g/mol = 222 gA mixture of 0.197 mol carbon dioxide and 0.00278 mol water vapor is held at 30.0 C and 2.50 atm. What is the partial pressure of each gas?
The partial pressure of each gas is the product of its mole fraction and total pressure. The partial pressure of carbon dioxide is 2.46 atm and the partial pressure of water vapor is 0.034.
What is Dalton's law of partial pressures ?Dalton's law of partial pressure states that the partial pressure of the component gases in a mixture is the product of its mole fraction and the total pressure.
Given that, number of moles of carbon dioxide = 0.197 moles.
number of moles of water vapor =0.00278 mole.
mole fraction of carbon dioxide = 0.197 / (0.197 + 0.00278) = 0.98
Total pressure = 2.50 atm
then partial pressure of carbon dioxide = 0.98 × 2.50 = 2.46 atm
Mole fraction of water vapor = 0.00278 / (0.197 + 0.00278) = 0.0139
partial pressure of water vapor = 0.0139 × 2.50 = 0.034 atm.
Therefore, the partial pressure of carbon dioxide and water vapor are 2.46 and 0.034 atm respectively.
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The ratio of carbon 14 to nitrogen-14 in an artifact is 13. Given that the half-
life of carbon-14 is 5730 years, how old is the artifact?
A. 17,190 years
B. 22,920 years
C. 11,460 years
D. 5730 years
maize is called monocot plant,why ? dive any two reasons
opss sorry this is science subject not chemistry
Answer:
because it has one cotyledon and it has parallel venation also maize is grain..
1. Molecules are held together by:
a, ionic bonds
b. covalent bonds
c. both a and b
A: ionic bond, you know why becasue it is
5. If 4 moles of nitrogen gas reacts with excess hydrogen gas, how many moles of NH3 will be produced?
Be sure to balance the equation first.
__N2 + __ H2 → __ NH3
a. 8 moles NH3
b. 4 moles NH3
C. 2 moles NH3
d. 12 moles NH3
explain the importance of fingerprint record in criminal investigation.
Answer:
One of the most important uses for fingerprints is to help investigators link one crime scene to another involving the same person. Fingerprint identification also helps investigators to track a criminal's record, their previous arrests and convictions, to aid in sentencing, probation, parole and pardoning decisions.
Explanation:
When lithium nitride, Li3N(s) , is treated with water, H2O(l) , ammonia, NH3(g) , is produced. Predict the formula of the gas produced when sodium phosphide, Na3P(s) , is treated with water. formula: Write the balanced equation for the reaction of Na3P(s) with H2O(l) . Phases are optional.
Answer:
The formula of the gas produced is[tex]PH_3[/tex], and the balanced equation is :
[tex]Na_3P(s)+3H_2O(l)\rightarrow 3NaOH(aq)+PH_3(g)[/tex]
Explanation:
The chemical reaction between lithium nitride and water gives lithium hydroxide and ammonia gas. The chemical equation of this reaction will be given as:
[tex]Li_3N(s)+3H_2O(l)\rightarrow 3LiOH(aq)+NH_3(g)[/tex]
And when sodium phosphide reacts with water is gives an aqueous solution of sodium hydroxide and hydrogen phosphide gas also called phosphine gas.
The chemical equation of this reaction will be given as:
[tex]Na_3P(s)+3H_2O(l)\rightarrow 3NaOH(aq)+PH_3(g)[/tex]
The formula of the gas produced is[tex]PH_3[/tex], and the balanced equation is :
[tex]Na_3P(s)+3H_2O(l)\rightarrow 3NaOH(aq)+PH_3(g)[/tex]
5. Which happens last in the process of photosynthesis?
The plant captures the sun's energy
Oxygen exits the leaf.
Water is taken up by the plant's roots.
O Carbon dioxide enters the leaf.
Answer:
Oxygen exits the leaf.
P-32 has a half-life of 14.28 days. 5 grams remain unchanged after 42.84 days. What was the initial amount of P-32?
Answer:
sus
Explanation:
sus
What is the pH of a solution if the pOH is 2.30?
pH=
(round to 2 decimal places)
Answer:
pH= 14-pOH
pH= 11.7
Explanation:
Answer: 2.30
Explanation:
Got it correct on edge 2021
Plzzzzzzzzzzzz help!!!!!!
i believe that is false
What is the name of the process scientists use to give different names to different organisms?
astronomy
economy
identification
taxonom
Answer:
D). Taxonomy.
Explanation:
'Taxonomy' is described as the process or the science of finding, describing, classifying, and naming different organisms. It is characterized as the technique of classification of animals, micro-organisms, plants, etc. into different categories or hierarchies. It has primarily been divided into eight distinct types like kingdom, species, order, family, etc.
Astronomy is associated with the study of the physical universe while the economy is defined as the study of efficient utilization of resources and identification is the process of recognizing an object. Thus, option D is the correct answer.
Which of the following are elements in this equation: 2H2O2 (aq) → 2H2O (l) + O2 (g)?
Check all that apply:
A. O
B. g
C. Aq
D. H
a) ¿De qué trata el cuento que leíste?
No hablo espanol could you put it in English?
1:Which example is not a physical change?
2: Which of the following is not a clue that a chemical reaction is taking place?