Answer:
Atoms are single neutral particles. Molecules are neutral particles made of two or more atoms bonded together. An ion is a positively or negatively charged particle.
Answer:
atoms constitute molecules; molecules are formed by the union of 2 or more atoms
Explanation:
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
The _______ is the part of the neuron that carries information away from the cell body.
cell body
axon
dendrite
nucleus
Answer:
b
Explanation:
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)
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.
Explain the relationship by between society and the Technologies of using earths resources
Answer:
We used coal for electricity, water for steam engines when we used them, natural fossil fuels for gasoline and oil and we use earths oxygen/nitrogen gases to breathe
Explanation:
Hope this helps:)....if not then sorry for wasting your time and may God bless you:)
When liquid bromine is cooled to form a solid, which of the following types of solid would it form?.
Answer:
If liquid bromine is cooled to form a solid, which type of solid does it form? Brass is made by melting copper and zinc and physically mixing them. As this alloy is cooled, it forms a solid where the copper and zinc are not chemically bonded together.
Explanation:
~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
Which of these solutions is the most basic?
Your answer:
[OH-] = 4.3 x 10-9 M
[OH-] = 2.8 x 10-11 M
[OH-] = 6.7 x 10-10 M
[OH-] = 1.0 x 10-5 M
Which of these solutions is the most basic?
[OH-] = 4.3 x 10-9 M
[OH-] = 2.8 x 10-11 M
[OH-] = 6.7 x 10-10 M
[OH-] = 1.0 x 10-5 M
Answer↷[OH-] = 1.0 x 10-5 M ✓ Solution↷[OH-] = 4.3 x 10-9 M
[OH-] = 4.3 x 10^-9 MpOH = - log [OH^1-]pOH = - log [4.3 x 10^-9]pOH = 8.36pH = 14- 8.36pH = 5.64_______________________________________
[OH-] = 2.8 x 10-11 M
[OH-] = 2.8 x 10^-11 MpOH = - log [OH^1-]pOH = - log [2.8 x 10^-11 ]pOH = 10.55pH = 14-10.55pH = 3.45_______________________________________
[OH-] = 6.7 x 10-10 M
[OH-] = 6.7 x 10^-10 MpOH = - log [OH^1-]pOH = - log [6.7 x 10^-10]pOH = 9.17pH = 14-9.17pH = 4.83_______________________________________
[OH-] = 1.0 x 10-5 M
[OH-] = 1.0 x 10-5 M pOH = - log [OH^1-]pOH = - log [1.0 x 10^-5 ]pOH = 5pH = 14-5pH = 9_______________________________________
we know that , the solution with pH > 7 is termed as basic and more the pH ,more the basicity, hence ,the solution with the highest pH would be the strongest base out of these all which is
[OH-] = 1.0 x 10-5 M with pH = 9
_______________________________________
Note the rule
pOH=-log[OH-]And we can find the answer through logarithm rules basic
loga^b=blogaSo
-log10^-n=nHigher the n higher the pOH
But
pH=14-pOHLesses pOH=Higher pH i.e basic HighAs we can see
Option D has least n (5)
Hence D is more basic
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.
Equation Unbalanced : __AlCl3 + __F2 --> __AlF3 + __Cl2
When 4.00g of flourine reacts with excess aluminum chloride, how many grams of chlorine gas are produced? First balance the equation.
[tex]\\ \rm\Rrightarrow 2AlCl_3+3F_2\longrightarrow 2AlF_3+3Cl_2[/tex]
Balanced3mols of fluorine produce 2 mol chlorine
1 mol fluorine produces 2/3=0.6mol chlorine
Moles of fluorine gas=
4/190.2mol.approxMoles of chlorine:-
0.2(0.6)=0.18molMass of chlorine
71(0.18)12.78gIs 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.
Aqueous potassium chloride will react with which one of the following to form a precipitation reaction?
copper (II) nitrate
sodium chromate
ammonium phosphate
lead (II) chlorate
Answer:
lead (II) chlorate
Explanation:
precipitate means not soluble in water
potassium chlorate is not very soluble in water, it precipitates and may be collected by filtration
lead(II) chloride can be made as a white precipitate by adding a solution containing chloride ions to lead(II) nitrate solution
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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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What are the spectator ions in the
following reaction?
NiS (s) + 2HCl(aq)
NiCl₂(aq) + H₂S(g)
B
S²-
CIT
Answer:
S
Explanation:
Match the molecules below with their functions:
Answer:
MAC: Assembly of the MAC leads to pores that disrupt the cell membrane of target cells, leading to cell lysis and death
Interferons: Stimulates the infected cells and those nearby to produce proteins that prevent the virus from replicating within them
Cytokines: Molecular messengers between cells
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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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What are some downsides to fossil fuels? (Select all that apply.) pls help im timed
They are expensive to extract compared to other forms of energy.
They release large amounts of carbon dioxide when burned.
They do not replenish themselves.
They are in a limited supply.
Answer:
B, C and D
Explanation:
Fossil fuels include coal, petroleum, natural gas, oil shales, bitumens, tar sands, and heavy oils. When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas, into the air.
Although fossil fuels are continually formed by natural processes, they are classified as non-renewable resources because they take millions of years to form.
fossil fuels, are called nonrenewable, which means they have a limited supply and are not continuously being made or they are made very slowly
For a given voltaic cell, you double the concentrations of all soluble components to 2.0 M instead of the standard 1.0 M. All other conditions are standard. What happens to the cell emf
If the concentration of the solutions are doubled then the cell EMF is also doubled.
Nernst equationAccording to the Nernst equation, the concentration of the species determines the cell EMF as we can see form the formula;
Ecell = E°cell - 0.0592/nlogQ.
Hence, if the concentration of the solutions are doubled then the cell EMF is also doubled.
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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:
freshwater is distributed in both time and space
The overall equation for the electrolysis of aluminium oxide is:
2Al2O3
4Al + 302
Calculate the mass of oxygen produced when 2000 kg of aluminium oxide is
completely electrolysed.
Relative atomic masses (A):
O = 16
Al = 27
941539.2 g of mass of oxygen is produced when 2000 kg of aluminium oxide is completely electrolysed.
What is electrolysis?Electrolysis is the process by which electric current is passed through a substance to effect a chemical change.
The mass of aluminium oxide Al₂O₃ = 2000 kg = 2000 000 g
Molar mass of Al₂O₃ = 101.96 g/mol
no of moles = [tex]\frac{mass }{ molar \;mass}[/tex]
no of moles of Al₂O₃ = [tex]\frac{2000 000 g}{101.96 g/mol}[/tex]
no of moles of Al₂O₃ = 19615.4 mol
From the reaction:
4Al + 3O₂ ⇒ Al₂O₃
To determine the moles of O₂ in Al₂O₃:
Then;
19615.4 mol X [tex]\frac{3}{2}[/tex] mol of O₂ = 29423.1
The mass of oxygen now = 29423.1 × 32 g
= 941539.2 g
Hence, 941539.2 g of mass of oxygen is produced when 2000 kg of aluminium oxide is completely electrolysed.
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What aspect of water makes it favorable to use in steam distillation?.
Answer:
The low molecular weight of water makes water a favorable liquid for steaming
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What is the second quantum number of a 1s2 electron in phosphorus, 1s22s22p63s23p3?
Describe how you would make 6.0 L of a 0.100 M KCl solution from a 4.0 M stock KCl solution.
Answer:
0.15 l of 4.0 m stock KCl solution should betaken
Explanation:
N1V1=N2V2
6*0.1=V2*4
V2=0.15L
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M1V1=M2V21x=15(2)1x=30x=30mlOption D
How many different consitutional isomers are there for a compound having the molecular formula C3H6O
Answer:
that make 11 isomers....
The volume of a gas collected when the temperature is 11. 0°c and the pressure is 710 mm hg measures 14. 8 ml. What is the calculated volume of the gas at 20. 0°c and 740 mm hg?.
Answer:
Original: P₁ = 710 mmHg, V₁ = 14.8 mL, T₁ = (273.2 + 11.0) K = 284.2 K
New: P₂ = 370 mmHg, V₂ = ? mL, T₂ = (273.2 + 20.0) K = 293.2 K
Combined gas law: P₁V₁/T₁ = P₂V₂/T₂
Then, V₂ = V₁ × (P₁/P₂) × (T₂/T₁)
Calculated new volume, V₂ = (14.8 mL) × (710/370) × (293.2/284.2) = 29.3 mL
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:
what are the ways to manage wastes.
Explanation:
1. Measure your waste
It is easier to manage and track your improvement on something that is measured. Start by recording the types and quantities of waste materials generated within your business.
This could just be a quick visual assessment and estimation of amount and types of waste per week. As you change how you manage your waste, you can compare and see what difference your changes make to the amount of waste disposed to landfill.
2. Reduce
To reduce the amount of waste going to landfill, consider:
can waste be avoided or reduced by the way you procure goods and services or by changing your business operations?
does another local business have a use for the waste materials produced by your business?
what materials can be targeted for recycling?
3. Recycle
Find out what options are available locally for business recycling.
4. Collection services
It is a good idea to find out how levy fees will be managed by your waste service provider, and find out more about your waste collection services—how it impacts your ability to recycle and what options are available to you.
5. Separating waste
It’s important to ensure that waste is correctly separated for recycling. Putting the wrong waste in contaminates the recycling. Check out the free-to-download recycling signage to help businesses communicate correct recycling and waste separation behaviours.
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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