The United Nations Population Fund designates today in history as the approximate day on which the world population reached six billion.
:)
5. The Half-life of cobalt-60 is 5 years. What fraction of a sample remains after 20 years?
a.One half
b. One quarter
c.One eighth
d. One sixteenth
How many mL of solution of 2. 00 M KI would you need to
prepare 100 mL of a 0. 600 M KI solution?
In complete sentences, provide a short explanation (2-3 sentences) as to why the elements are organized as they are within the periodic table.
help please
Answer:
The periodic table is arranged by atomic weight and valence electrons. These variables allowed Mendeleev to place each element in a certain row (called a period) and column (called a group). The table comprises seven rows and 18 columns
Explanation:
please consider as brainlest if helpful
Describe how to calculate the ocean concentration of CO32- using the data collected from 2015. You do not need to calculate it (only mention what data, constants and equations are needed).
The carbonic acid dissociation constant, ocean pH and the bicarbonate ion concentration are required to to calculate the ocean concentration of the carbonate ion.
What is concentration of a chemical species?The concentration of a chemical species is the amount in moles per given litre of solution.
To calculate the ocean concentration of the carbonate ion, the data needed are:
Total alkalinity The dissociation constant for the carbonic acid andpH bicarbonate ion concentrationThe equation for calculating the carbonate ion concentration is given below:
[tex][CO_3^{2-}] = \frac{K × [HCO_3^{-}]}{H^{+}}[/tex]
Therefore, to calculate the ocean concentration of the carbonate ion, the carbonic acid dissociation constant, ocean pH and the bicarbonate ion concentration are required.
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I NEED THIS FOR A TEST, FAST!
The element phosporus is located to the right of the element magnesium along the same period in the periodic table.
Which best describes the relationship of the elements?
Magnesium has a larger atomic number.
Phosphorus has a larger atomic mass.
Magnesium is in the same category as phosphorus.
Phosphorus has similar chemical properties as magnesium.
Which best describes the relationship of the elements?
Phosphorus has a larger atomic mass is your answer. :)
When two ammonium nitrate molecules collide with each other and then chemically decompose as a result, how many NEW molecules (in total) will be produced?
The collision and decomposition of 2 ammonium nitrate molecules results in the formation of 2 molecules of [tex]N_2O[/tex] and 4 molecules of [tex]H_2O[/tex]
Decomposition reactionAmmonium nitrate decomposes to produce nitrous oxide and water according to the following equation:
[tex]NH_4NO_3 --- > N_2O + 2H_2O[/tex]
In the above, a mole of ammonium nitrate decomposes to form a mole of nitrous oxide and 2 moles of water.
If moles of ammonium nitrate decomposes, the equation becomes:
[tex]2NH_4NO_3 ---- > 2N_2O + 4H_2O[/tex]
Thus, 2 moles of nitrous oxide and 4 moles of water would be formed.
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Which property would xenon most likely have? it is stable. it is a solid. it is flammable. it is silver in color.
Answer:
A. It is stable
Explanation:
Ed22
Stability is the property that would xenon most likely to have. Therefore, the correct option is option A.
What is xenon?Chemically speaking, xenon is a gas with the atomic number 54 and the symbol Xe. It is a thick, colourless, and odourless noble gas that is present in minute levels in Earth's atmosphere. It may go through a few chemical reactions, such as the creation of xenon hexafluoroplatinate, which is the initial noble gas combination to be created, despite typically being unreactive.
Flash lamps, arc lamps, and general anaesthetics all employ xenon. The early laser designs utilised xenon flash lamps for pumps and a xenon monomer molecule (Xe2) for the lasing medium in the initial excimer laser design. Stability is the property that would xenon most likely to have.
Therefore, the correct option is option A.
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Rechargeable batteries use a _________________medium to convert electrical current to a form of chemical energy which can be stored for future use.
Rechargeable batteries use a reversible reaction medium to convert electrical current to a form of chemical energy which can be stored for future use.
What is a rechargeable battery?A rechargeable battery is a type of battery that can be charged many times by passing electric current through the cells in a reversible reaction.
How does recahargeable battery store energy?When electrical energy from an outside source is applied to a secondary cell (reachargeable battery), the negative to positive electron flow that occurs during discharge is reversed, and the cell's charge is restored. This process is called reversible reaction.
Thus, rechargeable batteries use a reversible reaction medium to convert electrical current to a form of chemical energy which can be stored for future use.
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Instructions: In this activity you will be making a series of kool-aid solutions. Make sure to record all data and answer all the questions below.
Step 1: You will prepare a 237.5 ml kool-aid solution with a concentration of 1M. The molar mass of kool-aid (or sugar since kool-aid is basically sugar C12H22O11.) is 342 g/mol. Show the calculations below which helped you create your 1M solution. Note: 237.5 mL is approximately one cup.
Please show your work here.
Liters of water needed ______________
Molarity of kool-aid needed______________
Grams of kool-aid needed ______________
Based on the data provided, 0.2375 L of water and 81.225 g of Kool-aid are required to make 237.5 mL of 1 M solution of Kool-aid.
What is molarity of a solution?The molarity of a solution is the amount in moes of a solute dissolved in a given volume of solution in litres.
Molarity = number of moles/ volume in litresThe moles and mass of solute is calculated using the formula below:
moles = mass/molar massmass = moles × molar mass1 mole of Kool-aid = 342 g
Molarity of solution = 1 M
Volume of solution = 237.5 mL = 0.2375 L
number of moles solute = molarity × volume
number of moles of Kool-aid = 1 M × 0.2375 L = 0.2375 moles
Mass of Kool-aid required = 0.2375 × 342 = 81.225 g of Kool-aid.
Therefore, 0.2375 L of water and 81.225 g of Kool-aid is required to make 237.5 mL of 1 M solution of Kool-aid.
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Predict what happens to air movement when atmospheric pressure is 760 mm Hg, intrapulmonary pressure is 758 mm Hg, and intrapleural pressure is 754 mm Hg.
Because the atmosphere has a pressure difference of 2 mmHg from the lungs, air will migrate into the lungs to maintain equilibrium.
What happens to air movement when atmospheric pressure is 760 mm Hg, intrapulmonary pressure is 758 mm Hg, and intrapleural pressure is 754 mm Hg.?Generally, pressure is simply defined as the force exerted on an item.
In conclusion,if the above parameters where to occur, we would see air flows from a higher-pressure location to a lower-pressure area.
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Name the parts of the digestive system.
Answer:
The parts of the system is the mouth, throat or the pharynx if you want the scientific term, esophagus, stomach, small intestine, large intestine, rectum.
if you want just say intestine for those answers best if you say small and large though
Answer:
The digestive system involves the mouth, throat, esophagus, stomach, small intestine, large intestine, pancreas, liver, and gallbladder.Name the following aromatic hydrocarbon
CH3 CH2CH3
Br
A. 1-bromo-2-methyl-3-ethylbenzene
B. 1-bromo-2-ethyl-3-methylbenzene
C. 1-ethyl-2-methyl-3-bromobenzene
nternational Academu of Science
All Riahn
Answer:
B
Explanation:
You prioritize the bromo group and then name the alkyl substituents accordingly (and also in the correct alphabetical order)
B. 1-bromo-2-ethyl-3-methylbenzene is the aromatic hydrocarbon
CH3 CH2CH3Br.
Why are they referred to as fragrant hydrocarbons?Traditionally, benzene-like substances have been called aromatic hydrocarbons due to the fact that they had unique aromas. Today, aromatic compounds include any that incorporate a benzene ring or have the residences we accomplice with this group of compounds.
Aromatic compounds, additionally known as "mono- and polycyclic aromatic hydrocarbons", are natural compounds containing one or extra fragrant earrings. The discern member is benzene. Heteroarenes are carefully related, considering the fact that as a minimum one carbon atom of CH organization is changed through one of the heteroatoms oxygen, nitrogen, or sulfur.
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What is the name of the functional group that is attached to this hydrocarbon backbone? 2 carbons are double-bonded together; the pair is single bonded to h below right and upper c l below left, above left, and above right. ether alcohol alkyl halide carbonyl group
Answer:
Sorry I'm late man, but I bombed this quiz and here's the actual answers
1. functional group (top row); uses (bottom row)
2. Uses of Functional Groups Involving Oxygen
3. carbonyl
4. N is single bonded to R, and single bonded twice to H. (Or B)
5. RCOOH
6. a carboxylic acid and an amine
7. ethylamine
8. alchohol
9. alkyl halide
10. A central carbon is double bonded to O above, and single bonded to R below left and to O R prime below right. (Or B again)
Explanation:
Keep grinding. I know I will. I'm going to have to pull some all nighters in order to catch up before I work this summer. I'm so ahead on my classes and it still looks like I'll be doing school til the middle of June. You're not alone (If you're in the same situation as me that is). Good luck!
Answer:
I think it is alkyl halide
Explanation:
Edg 2022
What is the definition of thermal chemistry?
The study of change that involves cool objects
The study of change that involves temperature
The study of change that involves heat
Answer:
the second one
Explanation:
thermal has to do with temperature
What is the name of this compound? h single bonded to n with a pair of electron dots above and a single bond to h below, single bonded to the right to c with h above and below, and another c with h above, below, and right. ethanal ethylamine ethanoic acid methyl ethanoate
The name of the compound which is formed by the combination of nitrogen, carbon and hydrogen atoms is ethylamine.
What are compounds?Compounds are the substances which are prepared by the mixture of different elements.
In the question it is described that first nitrogen atom is attached with 2 hydrogen atoms and one lone pair of electrons as [tex]\ddot{NH_{2}}\\[/tex]. Now with this molecule one carbon atom with two hydrogen atoms are attached (CH₂) and with this carbon atom another carbon atom with three hydrogen atoms are attached as (CH₃).
Ethanal is wrong because in given compound (-CHO) group is not present.Ethanoic acid is wrong because in given compound (-COOH) group is not present.Methyl ethanoate is also wrong because in given compound (-ROO) group is not present.So obtained compound is NH₂-CH₂-CH₃ named as ethyl amine.
Hence name of the given compound is ethylamine.
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how many electrons occupy a filled 6s sublevel
Answer:
2 electrons
Explanation:
every s sublevel can only be occupied by 2 electrons so a filled 6s sublevel would have 2 electrons
How many grams are equal to 413kg ?
Answer:
413000 grams
Explanation:
from model
What is the volume, in liters, of 13.5 moles of a gas at STP? (STP = 273.15K, 1 atmosphere)
P
V
=
n
R
T
R = 0.0821
a
t
m
⋅
L
m
o
l
⋅
K
Answer:
302.75 Liters
Explanation:
Given:
P = 1 atm
V = ?
n = 13.5 moles
R = 0.0821 atm x L / mole x K
T = 273.15 K
PV = nRT
(1) (V) = (13.5) (0.0821) (273.15)
V = 302.75 Liters
You are given three samples of the same shampoo at three different temperatures: 35°C, 50°C, and 75-C. Which sample has the highest viscosity? (Would flow the slowest). Which sample has the highest flow rate? (Would flow the fastest). Explain each answer.
Help me please
Answer:
35°C would have the highest velocity because it's temperature is lesser hence the inter molecular forces between it molecules will be stronger and the velocity of the molecules will be lower than the rest.
the 75°C one would have the highest flow rate because its molecules will have a higher velocity and the inter molecular force between them will be less stronger
urgent helppppppppme
Convert 48 g O2 to moles of O2
Answer:
1.5 moles
Explanation:
O mole weight = 15.999
O2 mole weight = 2 * 15.999 = 31.998 gm
48 / 31. 998 = ~ 1.5 moles
Can y’all answer this Plss!! 100 points
Refer to the attachment
V1=0.271L=271mLApply Boyles law
[tex]\boxed{\sf {P\propto \dfrac{1}{V}\atop \implies \dfrac{P_1}{P_2}=\dfrac{V_2}{V_1}}}[/tex]
So
0.92/0.55=473.218/V1V1=472.218(0.55)/0.92V1=0.271LWhen a bunsen burner is properly adjusted, what should the flame look like?.
When a bunsen burner is properly adjusted, the flame look like outer violet and inner blue colour.
What is the clolur of flame?When a burner is properly adjusted the flame should have an outer violet oxidizing flame and an inner blue reducing flame. The temperature of blue colour is 15000 degree Celsius whereas the cool region outside the blue has 3000C temperature.
So we can conclude that When a bunsen burner is properly adjusted, the flame look like outer violet and inner blue colour.
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what mass of sulfur trioxide is formed from 96 g of sulfur dioxide?
Answer:
The mass of SO₃ formed is 120 g
Explanation:
The balanced equation for the reaction is given below:
2SO₂ + O₂ —> 2SO₃
Next, we shall determine the mass of SO₂ that reacted and the mass of SO₃ produced from the balanced equation. This can be obtained as follow:
Molar mass of SO₂ = 32 + (16×2)
= 32 + 32
= 64 g /mol
Mass of SO₂ from the balanced equation = 2 × 64 = 128 g
Molar mass of SO₃ = 32 + (16×3)
= 32 + 48
= 80 g /mol
Mass of SO₃ from the balanced equation = 2 × 80 = 160 g
Thus,
From the balanced equation above,
128 g of SO₂ reacted to produce 160 g of SO₃.
Now, we will get the mass of SO₃ by the reaction of 96 g of SO₂. This can be obtained as follow:
From the balanced equation above,
128 g of SO₂ reacted to produce 160 g of SO₃.
Therefore, 96 g of SO₂ will react to produce = = 120 g of SO₃.
With this, the mass of SO₃ formed is 120g
what is carried by waves
Answer:energy ( sorry if i'm wrong lol)
Explanation:
All waves carry energy. The energy of some waves, such as the energy of earthquakes, can be directly observed. Similarly, the churning of the shore by the water waves and the pulverization of nerve cells due to loud sounds are manifestations of wave energy.
A susbtance has an empirical formula of CrO2 and a molecular weight of 168 g/mol. determine the molecualr formula for this substance
Answer:
[tex]Cr_{2} O_{4}[/tex]
Explanation:
[tex]\frac{molecular weight}{molar mass}[/tex] = [tex]\frac{168}{83.99}[/tex] = 2.00
[tex]CrO_{2}[/tex] x 2 = [tex]Cr_{2} O_{4}[/tex]
1) Which of the following reactions is most likely to have a positive ASsys? (System refers to the reaction.)
a. SiC(s) + 2CO(g) → SiO2(s) + 3C(s)
b. 6CO2(g) + 6H2O(g) → C6H12O6(aq) + O2(g)
c. CO(g) + Cl2(g) → COCl2(g)
d. 2HNO3(1) + NO(g) + 3NO2(g) + H2O(1)
Answer:
D
Explanation:
Of the four given equations, we want to determine which will most likely have a positive ΔS.
A positive ΔS indicates an increase in entropy. Recall that entropy can be described as the "randomness" of a substance. Therefore, gases have the highest entropy, followed by liquids and solids.
Examining each answer choice:
A is unlikely to have a positive ΔS, as gases are being converted into solids. As a result, entropy is lowered. B is likewise unlikely to have a positive ΔS. Multiple moles of gases are being converted into solution and another gas, leading to a decrease in "randomness."While all species involved in C are gases, we can see that two moles of gases react to form only one. Because the amount of gases decrease as the reaction proceeds, the amount of "randomness" likewise decreases, indicating a decrease in entropy. D is the best answer. One mole of gas reacts to form three moles of gas, thereby increasing "randomness" and hence increasea entropy.What quantum mechanics principle states that electrons are added to atomic orbitals with the same energy so that each orbital is singularly occupied with electrons having the same spin?.
Answer:
hund's rule
Explanation:
states that single electrons with the same spin must occupy each equal-energy orbital before additional electrons with opposite spins can occupy the same orbitals (electrons fill empty orbitals before they pair up).
Indicate whether the following are signs or symptoms:
Answer:
A fever is a sympton. A headache is a sign. increase pulse rate is a sign. low blood pressure is a sign. feeling of dizzinies is a symptom. stomache is a symptom.
Explanation:
I learned these in class before and they make the most sense.
driving a car over snow covered roads will decrease tire pressure.
Is this Boyle’s Law, Charles Law, Gay-Lussac, or Avogadro’s Law?
Answer:
Gay-Lussac Law
Explanation:
We can eliminate two of the options :
Charles LawAvogadro's LawBoth of these laws do not involve variation in pressure, but only conditions in which they remain constant.
Boyle's Law
States that Pressure inversely varies with volumeMeaning if pressure decreases, volume will increaseMost likely does not apply to this questionGay-Lussac Law
States that pressure directly varies with temperatureHere it mentions : "over snow covered roads"Most likely the answer