Answer:
1. In electron dot structure, the dot represent one electrons.
2. Ionic compounds are highly soluble in water.
3. The bond formed by the mutual sharing of two electrons is called covalent bond.
4. there are 3 bonds in nitrogen molecule.
5. the ionic bonds are non-directional.
6. NaCl is taken in molten state
7. formula of common salt is NaCl.
8. Oxygen gas is a diamotic molecule.
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The activity of a radioisotope is 3000 counts per minute at one time and 2736 counts per minute 48 hours later. What is the half-life, in hours, of the radioisotope
The activity of a radioisotope is 3000 counts per minute at one time and 2736 counts per minute 48 hours later, then the half life time is 365 hours.
How do we calculate the half life time?Half life time for the first order reaction will be calculated by uisng the below equation as:
k = 0.693/t, where
t = half life time
k is the rate constant and its value will be calculatedy using the below equation as:
ln(No/N) = kT, where
No = initial concentration of radioisotope = 3000
N = remaining contentration of radioisotope = 2736
T = time require for above change = 48 hours
On putting these values on above equation, we get
k = ln(3000/2736) / 48 = 0.0019
Now putting this value in the first equation, we get
t = 0.693/0.0019 = 364.7 = 365 hours
Hence half life time is 365 hours.
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What is the temperature of 0. 750 mol of a gas stored in a 6,850 ml cylinder at 2. 21 atm?.
-246 K-
________________
A sample of iron (fe) with a mass of 200.0 g releases 9,840 cal when it freezes at its freezing point. what is the molar heat of fusion for iron? use q equals n delta h.. 2,747.7 cal/mol 2,771.8 cal/mol 2,811.7 cal/mol 3,280.0 cal/mol
The molar heat of fusion for iron with a mass of 200.0g releases 9,840 cal when it freezes at its freezing point is 2,747.7 cal/mol.
How to calculate molar heat of fusion?The heat of fusion of a substance can be calculated by using the following formula:
Q = m∆H
Where:
Q = quantity of heatm = mass∆H = change in temperature of fusionHowever, the quantity of heat has been given as 9840calories. The molar heat of fusion of iron can be calculated by dividing the heat of fusion by the number of moles of iron.
Moles of iron = mass ÷ molar mass
moles = 200g ÷ 55.8g/mol
moles = 3.58moles
molar heat of fusion = 9840 cal ÷ 3.58mol
molar heat of fusion = 2748.6 cal/mol
Therefore, the molar heat of fusion for iron with a mass of 200.0g releases 9,840 cal when it freezes at its freezing point is 2,747.7 cal/mol.
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Answer:
A) 2,747.7 cal/mol
Explanation:
EDGE 2022
What is the empirical formula of a compound that is 41.4% Strontium, 13.24%
Nitrogen, and 45.3696 Oxygen
Empirical Formula StepsN2O6Sr Strontium Nitrate
Explanation:
How many different consitutional isomers are there for a compound having the molecular formula C3H6O
Answer:
that make 11 isomers....
The purpose of the light dependent reaction is to convert ____ to _____.
Animals that eat only other animals are called ________. (2 points) a carnivores b decomposers c herbivores d omnivores. Giving 27 points
Answer:
The answer is Carnivore
Explanation:
A carnivore eat meat which is other animals.
Energy Transformation: A home is heated with geothermal energy
(What energy forms are used and how do they go from each form to get to the final form)
Answer: they convert heat to electricity.
Explanation:
Proponents of breast feeding often cite the passing of antibodies to the infant as a benefit. This type of immunity would be considered
artificial active immunity.
natural active immunity.
natural passive immunity.
vaccination.
artificial passive immunity.
Answer:
Natural passive immunity
Explanation:
Breatsfeeding is natural....
antibodies passes from the parent to the infant...
The infant gets nutrition in which later antibodies will be formed by the nutrients..
Plan an investigation to explore the evidence that an electric current produces a magnetic field, and that a changing magnetic field produces an electric current.
Answer:
Give evidence for the existence of a magnetic field near a current carrying wire. If you hold a compass near a wire through which current is flowing, the needle on the compass will be deflected.
A sample of radon gas has a volume of 1.53 L, a pressure of 1.15 atm, and a temperature of 305 K. What is the new pressure if the new volume is 1.78 and the new temperature is 325 K
Answer: 0.813 L
Explanation:
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Combined Boyle's and Charles' gas law is used here. Therefore the new pressure of helium gas is 5.63 atm.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of radon gas
V= volume of radon gas
n =number of moles of radon gas
T =temperature of radon gas
R = Gas constant = 0.0821 L.atm/K.mol
Combining Boyle's and Charles' gas law
P₁V₁/T₁ = P₂V₂/T₂
{ (1.15 atm) (1.53 L)} ÷305 K ={ (P2) ( 1.78)} ÷325 K
P2 = 7.55÷1.34 = 5.63 atm
Therefore the new pressure of radon gas is 5.63 atm when the temperature is changed to 325K and volume is decreased to 1.78liter.
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A chemist wants to make 750mL of a 6M NaOH solution. What mass (in grams) of NaOH will they need?
Answer:
180 g NaOH
Explanation:
Step #1 : Use the molarity equation to find moles. The volume is needed in liters, so convert the milliliters to liters.
Molarity (M) = moles (mol) / liters (L) ---->
Molarity (M) x liters (L) = moles (mol)
750 mL NaOH 1 L
x ---------------- = 0.75 L NaOH
1,000 mL
(6 M NaOH) x (0.75 L NaOH) = ? mol
= 4.5 mol NaOH
Step #2 : Find the mass using the moles and the molar mass of the solution. The molar mass can be calculated using the values of the elements on the periodic table.
Molar Mass (g/mol) = grams (g) / moles (mol) --->
Molar Mass (g/mol) x moles (mol) = grams (g)
? g/mol = (22.99 g/mol Na) + (15.999 g/mol O) + (1.008 g/mol H)
? g/mol = 39.997 g/mol NaOH
(39.997 g/mol NaOH) x (4.5 mol NaOH) = ? g
= 179.99 g NaOH
= 180 g NaOH (2 sig figs)
= 200 g NaOH (1 sig fig)
The reaction below is at equilibrium. What would happen if more Na2O2 were
added?
2Na(s) +0,02Nao,(s)
A. The equilibrium position would stay the same.
O B. The equilibrium position would shift to produce more Na202.
C. The equilibrium position would shift to produce more Na2 and 02.
D. The equilibrium position would shift to produce more 02.
If more Na[tex]_2[/tex]O[tex]_2[/tex] were added in 2Na(s) +0,02Nao,(s)→ Na[tex]_2[/tex]O[tex]_2[/tex]. The equilibrium position would shift to produce more Na and O[tex]_2[/tex]. Therefore, the correct option is option C.
What is equilibrium?During a reversible chemical process, chemical equilibrium is the state in which there is no net change in the quantity of reactants or products. When a chemical reaction is reversible, the products react with the original reactants as soon as they are created.
There's no net change in the quantity of the chemicals involved when the two opposed reactions are in equilibrium because they are occurring at identical rates, or velocities. At this point, the reaction can be deemed to be finished, meaning that the maximum amount of reactants into products has been converted under the given reaction conditions. If more Na[tex]_2[/tex]O[tex]_2[/tex] were added in 2Na(s) +0,02Nao,(s)→ Na[tex]_2[/tex]O[tex]_2[/tex]. The equilibrium position would shift to produce more Na and O[tex]_2[/tex].
Therefore, the correct option is option C.
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What is the second quantum number of a 1s2 electron in phosphorus, 1s22s22p63s23p3?
Can someone please help me? :(
Answer:
b
Explanation:
Answer:
The answer is B
Explanation:
I hope this helps very much
What is the molarity of 2.5 liters of solution containing 5 moles of NaCl?
Answer:
2 mol/L
Explanation:
Molarity is Moles/Liters, you just simple divide 5 moles ÷ 2.5 L =2 mol/L
A beaker filled with freshwater has a p h balance of 6.65. geraldo wants to model the effect of acids on the ph of water for a group of students. which pollutant should geraldo add to the water? what will the ph reading be after geraldo adds the pollutant?
Geraldo can add a pollutant with slightly basic nature so he will have a solution of neutral pH of 7.
What is pH?The pH of a solution is the negative logarithm to base ten of the hydrogen ions concentration of the solution.
The pH of 6.5 means that the solution is acidic.
By adding a pollutant which is slightly basic in nature, Geraldo will have a solution of neutral pH which is a pH of 7.
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Answer:
1.pesticide
2.less than 6.65
Explanation:
When considering metal complexation with EDTA, if you are comparing 2 metals, the metal with a higher ____________ will react with EDTA first.
If you are comparing 2 metals, the metal with a higher Number of free ions will react with EDTA first
What is EDTA ?EDTA is a type of chemical which binds certain metal ions such as calcium and magnesium. some of the functions of EDTA includes:
Preventing blood clotting of blood samplesprevention of the formation of Biofilm by bacteriasThe EDTA will readily react with metals which have a hiogher number of free ions that it can bind with.
Hence we can conclude that If you are comparing 2 metals, the metal with a higher Number of free ions will react with EDTA first.
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~cosmic snowball ~orbits our Sun ~frozen gases, rock and dust ~may have brought water to Earth ~dust and gases form a tail that stretches away from the Sun The prompt above is describing what celestial body?
Answer:
A comet
Explanation:
Comets travel so fats through the solar system that they melt which give them their glowy tail
What is the concentration, in molarity, of a solution that contains 19g of NaOH dissolved into water to make 500 mL of solution?
Answer:
The molar concentration of NaOH in the final diluted solution is 0.056 M
Explanation:
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Let's see
M1V1=M2V21x=15(2)1x=30x=30mlOption D
A sample of oxygen occupies a volume of 250. liters at 375 K. Predict the volume of the sample, when the temperature drops to 280. K with constant pressure.
A. 164 L
B. 187 L
C. 223 L
D. 352 L
Answer:
187 L
Explanation:
its the correct answer on smartsparrow.
The _______ is the part of the neuron that carries information away from the cell body.
cell body
axon
dendrite
nucleus
Answer:
b
Explanation:
What is science? Write a definition for the word
Answer:
make me brainliest pls :)
Explanation:
Science is both a body of knowledge and a process. In school, science may sometimes seem like a collection of isolated and static facts listed in a textbook, but that's only a small part of the story. Just as importantly, science is also a process of discovery that allows us to link isolated facts into coherent and comprehensive understandings of the natural world.
Science is exciting. Science is a way of discovering what's in the universe and how those things work today, how they worked in the past, and how they are likely to work in the future. Scientists are motivated by the thrill of seeing or figuring out something that no one has before.
Science is useful. The knowledge generated by science is powerful and reliable. It can be used to develop new technologies, treat diseases, and deal with many other sorts of problems.
Science is ongoing. Science is continually refining and expanding our knowledge of the universe, and as it does, it leads to new questions for future investigation. Science will never be "finished."
Science is a global human endeavor. People all over the world participate in the process of science. And you can too!
Explain how the law of conservation of mass allows you to interpret a balanced chemical equation in terms of mass.
Balancing the coefficients means that the number of atoms are the same on each side which means that the masses of reactants and products are equal.
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Is a pearl a mineral? Explain your answer thoroughly. Read the description in the reference image to help you determine the answer.
HELP!! IM SO BAD AT SCIENCE!! PLEASE ANSWER AS SOON AS POSSIBLE
Answer:
A pearl is not a mineral
Explanation:
Even though a pearl is made up of a few little overlapping platelets of certain minerals such as aragonite, which is the stable form of calcium carbonate which is a necessary component for sealife. Why is a pearl not a mineral though? Yes a pearl is made up of mineral compounds, but its organic origins take away its ability to be included as a mineral. Pearls do not have distinctive crystal structures and are formed by living organisms.
How many hydrogen molecules are in 1.2 moles of hydrogen?
7.2 x 10^23
0.19 x 10^23
1.9 x 10^24
4.8 x 10^23
Answer:
7.2 x 10^23
Explanation:
Currently in Chemistry class
In which reaction at equilibrium will the point of equilibrium shift to the right when the pressure decreases at constant temperature
1. N2(g) + 3H2(g) - 2NH3(g)
2. H2(g) + Bra(o) - 2HBr()
3. CaCO3(s) - Cao(s) + CO2(g)
3. N2(g) + O2(g) - 2NO(9)
Answer:3
Explanation: an increase in pressure will just place the point of equilibrium in the direction that fevers the formation of the fewer number of moles. A decrease in pressure will displace the point of equilibrium in the direction that favors the formation of a greater number of moles as a system attempts to return to equilibrium
The reaction CaCO3(s) →Cao(s) + CO2(g) at equilibrium will be shifted to the right when the pressure decreases at constant temperature.
What is equilibrium?Chemical equilibrium can be defined as the state of a system where the concentration of the reactant, as well as the concentration of the products, as well as the concentration of the products, will not change over time and the system's characteristics also will not change.
It is well known that when the number of moles grows, equilibrium shifts to the side where the number of moles grows when pressure is reduced.
In this equation, CaCO3(s) →Cao(s) + CO2(g)
Number of moles in reactant side= 1
Number of moles in product side = 2
Hence, for this reaction equilibrium will be shifted in right side.
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Sulfur burns in the air to form 33.6L of sulfur dioxide. (S = 32, O =16, 64g of sulfur dioxide has 22.4L, 32g of oxygen has 22.4L)
find mass of reacted oxygen
find mass of required oxygen
The mass of oxygen reacted/required in this reaction is obtained as 48g.
What is stoichiometry?The term stoichiometry has to do with mass- volume or mass - mole relationship which ultimately depends on the balanced reaction equation.
Now, we have the reaction; S + O2 ------>SO2
If 1 mole of sulfur dioxide contains 22.4 L
x moles of sulfur dioxide contains 33.6L
x = 1.5 moles of sulfur dioxide.
Since the reaction is 1:1, the number if moles of oxygen required/reacted is 1.5 moles.
Mass of oxygen required/reacted = 1.5 moles * 32 g/mol = 48g
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The diagram below shows the branching tree diagram for cats. (5 points)
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 with the following traits Four limbs, Amniotic egg, Fur, Shearing teeth, and Retractable claws. There is one vertical line between each of the consecutive five dots. The lines are labeled from the from left to right as Amphibians, Reptiles, Marsupials, Dogs, Cats.
Which characteristic is shared by the greatest number of organisms?
Amniotic egg
Four limbs
Fur
Retractable claws