Answer:0.305g
Explanation:
mass = 79.9x(2.3 x 10^21) / (6.02 x 10^23)
= 0.305
Think-tank 1. Substances which make up a mixture can be in any combination of the three physical states - solid, liquid or gas. Give an example of a mixture with the following combinations of physical states: a. solid-solid b. liquid-liquid C. gas-gas d. solid-liquid e. solid-gas f. liquid-gas
Answer:
A. orqnges and bananas
B. Water and lemon juice
C. Air ( mixture of oxygen and nitrigen)
D. stones in water
E. smoke ( soot suspended in air)
F. coca cola ( Carbon dioxide dissolved in water)
Sinong pilipino dito kawaykaway naman kayo dyan haha
Answer:
ako po because I'm pilipino
Explanation:
HAHAH same too
1. ATOMIC RADIUS: For each of the following sets of atoms, rank the atoms from smallest to largest atomic radius.
a. Li, C, F
b. Li, Na, K
c. Ge, P, O
d. C, N, AI
Answer:
The answer is letter C
Some chemicals, most often inorganic salts, in the laboratory have the nasty tendency to absorb water from the atmosphere. This property is called hygroscopicity. Anhydrous (water-free) Cupric Perchlorate [Cu (ClO4)2] weighs 262.447g/mol, but after sitting on out on the bench top absorbs water from the air and now weighs 370.540g/mol. How many water molecules did our Cupric Perchlorate absorb?
If an anhydrous Cupric Perchlorate weighs 262.447g/mol initially and weighs 370.540 g/mol after sitting on the bench to absorb water from the air, the number of water molecules absorbed would be 6 moles.
First, let us calculate the amount of water gained during the course of staying on the bench:
Water gained = weight after gaining water - initial weight
= 370.540 - 262.447
= 108.093g/mole
The total amount of water gained per mol is 108.093. Each water molecule weighs 18.015 g/mole. Thus, the total number of water molecules that will sum up to 108.093 would be:
108.093/18.015 = 6 moles
In other words, the number of water molecules absorbed by the Cupric Perchlorate is 6 moles.
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What is the molarity of 98.0 g of phosphoric acid, H3PO4 in 1.00 L of solution. Please show your work.
Answer:
1.0001 M
Explanation:
Molarity = Mass/(Volume x molar mass)
Molarity = 98.0 g/(1.00 L x 97.994 g/mol)
Molarity = 1.0001 M
the molarity of 98.0 g of phosphoric acid, H3PO4 in 1.00 L of solution is 1.0001 M
what is the difference between molarity and molality ?Molarity can be defined as the number of moles of solute available in a definite concentration and amount of the solution, other wise called as moles per liters of a solution.
Molality of a solution can be defined as the number of moles per solute can be present in a kilogram of the solvent, which is moles per kilogram of a solvent.
Though the terms Molarity and Molality are quite similar but the sharp difference between them as it creates a huge difference while using this two form of calculation for various calculations.
Molarity = Mass/(Volume x molar mass)
Here, Molarity = 98.0 g/(1.00 L x 97.994 g/mol)
Molarity = 1.0001 M
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By referring to particles, explain why the white ring formed in the glass tube
Answer:
Ammonia and Hydrogen Chloride.
Explanation:
Assuming this is what you're referring to, Ammonia (NH3) and Hydrogen Chloride(NCI3). The concentrated ammonia (NH3) is placed on a pad in one end of a tube and hydrochloric acid (NCI3) on a pad at the other. Shortly after the gases will begin diffusing far enough to meet, a ring of solid ammonium chloride (NH4Cl) will be formed.
Element is in group 15. Element Y is in group 17. Both of these elements are
In the compound XY3, there are
shared electron pairs.
Answer:
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can someone help me please ... god will bless u if u help...it is very urgent... i only have 1hr to answer this question
Answer:
iuiwusiwuiqihihiuwusbhwubduywbduywbudb me no esspanlo
Explanation:
niuniniuniuniun
What are the two parts of the third Step?
O Plug and solve
O Formula and solve
O Show work and solve
O Question and show work
Answer:
A
Explanation:
Answer:
I'm not quite sure what the question is. What is the third step? I think I can help, would you mind commenting what the third step is? :)
Explanation:
When the electron from the n=4 excited state drops to the ground state, does it absorb energy or emit energy?
Answer:
It emits energy since to move from a higher energy level to a lower energy level or ground state, it must lose energy.
How many grams are in 0.990 mol of neon?
mass in grams:
Explanation:
Multiply the given moles times the molar mass of neon, 20.180 g/mol (periodic table).
Answer:
Multiply the supplied moles by 20.180 g/mol, the molar mass of neon (periodic table).
Explanation:
What is the overall charge of an atom? Explain why
Answer:
atoms have no overall charge. this is because they contain equal numbers of positive protons and negative electrons
What sign of chemical change occurs during chemiluminesence?
Production of heat
Production of a gas
Production of light
O Production of a solid (precipitation)
Answer:
Emission of Light
Explanation:
Chemiluminescence is the emission of light as the result of a chemical reaction, and not a property of a specific compound.
Dont know if you were asking for this but hope it helps
Explain how Dri-FIT material works using the properties of water.
Answer:
El sistema Dry-Fit funciona transportando la humedad a la superficie de la prenda, facilitando su evaporación. Comúnmente se utilizan materiales como el poliéster o microfibras de materiales sintéticos, ya que no absorben líquidos.
Explanation:
espero que te sirva
What is a small description of a atom
What is metabolism? I know the answer.
Answer:
Metabolism is the set of life-sustaining chemical reactions in organisms. The three main purposes of metabolism are: the conversion of the energy in food to energy available to run cellular processes
Explanation:
What is extrapolation?
A. Predicting data that fall beyond a known data point
B. Estimating data that fall between two known data points
C. Finding a line that follows closely to all the points
O D. A close relationship between two events
Answer:
A. Predicting data that fall beyond a known data point
Explanation:
Extrapolating is unreliable because you are predicting data outside of the data range - anything could happen for the data to stop following the trend or pattern
Identify the one thing that you were most surprised by in the quiz. Explain
why.
Adhesion is the attraction of molecules of one kind for molecules of a different kind... water is adhesive because the water molecules are attracted to the straw and therefore adhere to it. Thus, adhesive forces are important for sustaining life. This is because of these forces, water can flow up from the roots to the tops of plants to feed the plant, allowing it to move against gravity through plant cells. Another example of why its important that water is adhesive is the movement of water to the tops of trees and the drainage of tears from tear ducts in the corners of your eyes. Or how water droplets stick to the end of the pine needles. These are all examples of adhesion.
Hope this helped you- have a good day bro cya)
what is the percent by volume of a solution formed by mixing 25ml of isopropanol with 45ml water
Answer:
I assume that you mix the 25 mL alcohol with 45 mL water.
The answer depends on a big IF : IF the volumes are additive. Very often volumes of liquids are not additive
Total volume = 70 mL
isopropyl alcohol %(v/v) = 25mL/ 70 mL * 100 % = 35.7% v/v
The answer should have only 2 significant digits: 36%v/v
Explanation:
Hope it helps
The percent by volume of a solution formed by mixing 25 ml of isopropanol with 45 ml of water is 35.71% which is rounded off to 36%.
What is meant by percent by volume of a solution?Percent volume is defined as the concentration of a particular solute which is measured in terms of volume present in a solution. The volume of the solution is present in the denominator which indicates the total volume of all components .
It is expressed as,
percent volume= volume of solute/volume of solution×100
It is used for solutions which are made by mixing two components . It is one of the ways of expressing concentrations of mixture with a dimensionless quantity.
Percent volume of the given solution is calculated by substituting the given values in the formula like, 25/70×100=35.71%
Thus, the percent by volume concentration of the solution is 35.71%≈36%.
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why does exercising causes the change in our body ( breathing/heart rate)
Answer:
Explanation:
The biggest change in the body caused by regular exercise is to muscle tissue. ... At the cellular level, exercise triggers the release of substances that dilate the blood vessels in the muscle, letting in more oxygen, says Prof Bradford. These are short-term effects, but deeper changes come with regular exercise.
Exercising causes changes in our body because we're working our muscles so there's more going on with us compared to when we're just laying down. We need more oxygen to go to our muscles so we breathe harder and more rapidly. Our heart also beats faster because it needs to pump more blood to the muscles that are being worked.
what is the product of the following reaction? Cd+Znso
A. Zn+CdSO4
B. H2+CdSO4
C. H2+ZnSO4
D. H2+Zn
E. No reaction
Answer:
Cd + ZnSO4 -----> Zn + CdSO4
Explanation:
:)
helpppppppppppppppppppppppppp
Answer:
The answer is B(the path water takes from Earth to the clouds and back again)
How do Hydrogen-1, Hydrogen-2, and Hydrogen-3 differ from each other?
Answer:
different from the number of their neutrons
Explanation:
They each have one single proton (Z = 1), but differ in the number of their neutrons. Hydrogen has no neutron, deuterium has one, and tritium has two neutrons. ... Their nuclear symbols are therefore 1H, 2H, and 3H. The atoms of these isotopes have one electron to balance the charge of the one proton.
Why do both nuclear and chemical
changes occur?
Answer:
The change in energy for a chemical reaction has to do with the potential energy of the electrons. The change in energy for a nuclear reaction has to do with the potential energy of the nucleus. The change in energy for a nuclear change is many orders of magnitude larger than for a chemical change.
The statement that describes both nuclear and chemical changes occur is "potential energy."
What is nuclear and chemical reaction?Nuclear reactions include a change in the nucleus of an atom, which usually results in the production of a different element. Chemical reactions, on the other hand, require just electron rearrangement and no changes in nuclei.
A nuclear reaction is any reaction that causes the nucleus of an atom to change. An atom's nucleus is made up of protons and neutrons. It seems to reason that a nuclear reaction alters the amount of protons and/or neutrons in an atom.
Chemical changes occur when bonds between molecules or atoms are broken and/or formed to form a new material. In this case, the new substances' qualities differ from the old, the particles differ, and the number of particles can alter.
The change in energy for a nuclear change is many orders of magnitude greater than the change in energy for a chemical change.
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(iii) Explain why magnesium chloride has a high melting point.
Answer:
magnesium chlorides are solids with high melting and boiling points because of the large amount of heat which is needed to break the strong ionic attractions.
Explanation:
These magnesium ions have more than one charge (2+). These highly charged ions will attract other ions more strongly than ions with one charge, therefore more energy will be needed to overcome the electrostatic forces of attraction and so the melting points will be higher.
How many mm Hg are there in 2.27 atm?
Answer:
[tex]\huge\boxed{\sf 2.27\ atm = 1,725\ mm\ of\ Hg}[/tex]
Explanation:
We know that:
1 atm = 760 mm of Hg (Standardly)
Multiply both sides by 2.27
2.27 atm = 760 * 2.27 mm of Hg
2.27 atm = 1,725 mm of Hg
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807in which process water partially breaks down into charged particles?
Answer:
presipitayion
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how many grams are present in 0.885 moles of manganese?
A. 48.6g
B. 62.1 g
C. 27.5 g
D. 0.016g
E. 21.5g
As per the details given, 48.6 g are present in 0.885 moles of manganese. The correct option is A.
To determine the gram contained in a given number of moles, use the element's molar mass. Manganese (Mn) has a molar mass of roughly 54.94 g/mol.
To calculate the grammes in 0.885 moles of manganese, use the following formula:
moles of Mn × molar mass of Mn = mass of Mn in grams
On calculating it:
0.885 moles × 54.94 g/mol = 48.60 g
Therefore, the mass of manganese present in 0.885 moles of manganese is 48.60 grams.
Thus, the correct answer is A. 48.6g.
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identify impacts of air pollution
Answer:
Air pollution can also cause headaches, dizziness, and nausea. ... Long-term health effects from air pollution include heart disease, lung cancer, and respiratory diseases such as emphysema. Air pollution can also cause long-term damage to people's nerves, brain, kidneys, liver, and other organs.
Explanation:
https://www.nationalgeographic.org/encyclopedia/air-pollution/#:~:text=Air%20pollution%20can%20also%20cause%20headaches%2C%20dizziness%2C%20and%20nausea.&text=Long%2Dterm%20health%20effects%20from,%2C%20liver%2C%20and%20other%20organs.
What indicates that two objects are in thermal equilibrium?
A The Objects Are the same size
B The objects Have the same temperature
C The objects are touching each other.
D The objects' temperatures are changing.
Answer:
B
Explanation:
equilibrium happens when two things are in complete balance and thermal is in reference to heat so two things are in thermal equilibrium once they have the same temperature.
The option which indicates that two objects are in thermal equilibrium is the objects that have the same temperature. Thus, the correct option for this question is B.
What is Thermal equilibrium?Thermal equilibrium may be defined as a state of a system in which all the parts of the system occupy the same temperature. Two or more objects are in thermal equilibrium if there is no net flow of thermal energy or heat between them when they are considerably connected by a path permeable to heat.
The mechanism of thermal equilibrium occurs when a cup of hot coffee is put on the table and after a short period of time, the temperature of the coffee is the same as the surrounding temperature. So, this represents an example of thermal equilibrium.
Therefore, the correct option for this question is B.
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