Answer:
straight to the point:
Explanation:
atomic radius of :
k = 280 pm
Ca = 231 pm
Mg = 173 pm
Be = 153 pm
Rb = 248 pm
pm means "picometers".
so knowing this we will have :(largest to smallest),
k
Rb
Ca
Mg and
Be.
hope this helps .
Bonding with intermolecular forces:
1.) is CH3Br a hydrogen bonding? yes or no?
2.) is CH3Br dipole-dipole interactions? Yes or no?
3.) is CH3Br a london dispersion forces? Yes or no?
Answer:
1. yes
2. yes
3. no
sorry if wrong but hope this helps
carbon reacts with oxygen to produce carbon dioxide (CO2(g),deltaHf=-393.5kl/mol)according to the equation below
The heat required to form 1 mole of carbon dioxide from carbon and oxygen is 393.5 kJ/mol.
What is the enthalpy of formation?Enthalpy of formation of a substance is the heat required to form 1 mole of a substance from its reactants.
Carbon reacts with oxygen to produce carbon dioxide.
The enthalpy of formation of carbon dioxide is -393.5 kJ/mol.
Therefore, the heat required to form 1 mole of carbon dioxide from carbon and oxygen is 393.5 kJ/mol.
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Metal: Specific Heat (J/goC)
Calcium: 0.647
Iron: 0.449
Silver: 0.235
Gold: 0.129
After absorbing 0.500 kJ of energy, a 55.5 g sample of an unknown substance has a temperature increase of about 14 degrees Celsius. Identify the substance.
Group of answer choices:
A.) Gold
B.) Iron
C.) Silver
D.) The substance is not listed.
E.) Calcium
Identified substance which is present in the sample of 55.5g is calcium, because the calculated and actual specific heat is almost same.
What is the relation between specific heat and absorbed heat?Relation between the amount of absorbed heat and specific heat of any substance is shown by following equation:
Q = mcΔT, where
Q = absorbed heat = 0.500kJ = 500Jm = mass of unknown substance = 55.5 gc = specific heatΔT = change in temperature = 14 degrees CelsiusOn putting all these values on the above equation, we get
c = 500 / (55.5)(14) = 0.643 J/g. degrees Celsius
And this value is almost equal to the given specific heat value of calcium, so the given substance is calcium.
Hence the given unknown substance is calcium.
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How much potassium nitrate will dissolve in 50 grams of water at 70°C?
PLEASE
Answer:
The solubility graph is a very useful tool because it tells you the amount of potassium nitrate that can be dissolved per
100 mL
of water in order to have a saturated solution of potassium nitrate at a given temperature.
In order to find the solubility of the salt at
60
∘
C
, start from the
60
∘
C
mark on the graph and move up until you intersect the curve. At the point of intersection, move left until you intersect the
y
axis and read off the value that you land on.
In this case, you can estimate that the solubility of potassium nitrate in water at
60
∘
C
is equal to about
Which of the "planetary health measures" shown here have humans already exceeded?
Question 1 options:
global average surface temperature
ocean pH
atmospheric Carbon Dioxide
sea level rise
Answer:
the answer is atmospheric carbon dioxide
Explanation:
The presence of carbon dioxide in atmosphere warms the planet and causes the climate change. Human activities have raised the atmospheric CO₂ content. Here atmospheric carbon dioxide is the planetary health measures which humans already exceeded. The correct option is C.
What is planetary health measures?The planetary health measures offers a way to understand the relationship between human health and the environmental sustainability. The global environmental degradation and climate change threaten the foundation of human health and well being.
Carbon dioxide is an important greenhouse gas that comes from the burning of fossil fuels like coal or oil which traps heat. The increased level of CO₂ in the atmosphere causes greenhouse effect and it does not allow hot rays of the sun to escape from the atmosphere.
The increased level of CO₂ also causes the global warming which increases the temperature of the earth.
Thus the correct option is C.
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Which is an example of an instinct?
Answer:
An innate, typically fixed pattern of behavior in animals in response to certain stimuli.
CH3NH2 + H2O = (CH3NH3)1+ + (OH)1-
Which are the acids and which are the bases.
Answer:
CH3NH2 + H2O = CH3NH3 + OH - Balanced Chemical Equation
Explanation:
CH3NH2- BASE
H20- both
CH3NH3- ACID
OH- BASE
Which of the following most accurately describes diffusion?
Answer:
Diffusion is the movement of a substance from an area of high concentration to an area of lower concentration
hope this helps!!!
What is the volume of 23 g of neon gas at 1.0oC and a pressure of 2.0 atm?
Answer:
12.82 liters
Explanation:
From periodic chart ...mole weight of neon = 20.1797 gm/mole
23 g / 20.1797 g/mole = 1.14 moles
PV = n R T R = gas constant = .082057 L-Atm / K-mole
n = 1.14
T = 1 C = 274.15 K
2 * V = 1.14 * .082057 * 274.15 Solve for V = 12.82 liters
How many moles of Na2O are in 350 mL of 1.2 M solution?
Answer:
0.42 moles Na₂O
Explanation:
Molarity: 1.2 M
Volume (mL): 350 mL
Volume (L): 0.35 L
350 mL / 1,000 mL = 0.35 L Na₂O
Molarity (M) = moles / liters (L)
1.2 M Na₂O = ? moles / 0.35 L Na₂O
(1.2 M Na₂O) x (0.35 L Na₂O) = ? moles
? = 0.42 moles Na₂O
2. What causes a current in an electric circuit?
conductor
voltage
ampere
electric charge
Answer:
electric charge
Explanation:
The hybridization of nitrogen in NH4NO3
Answer:
In chemistry, orbital hybridisation (or hybridization) is the concept of mixing atomic orbitals into new hybrid orbitals (with different energies, shapes, etc., than the component atomic orbitals) suitable for the pairing of electrons to form chemical bonds in valence bond theory. Hybrid orbitals are very useful in the explanation of molecular geometry and atomic bonding properties and are symmetrically disposed in space. Although sometimes taught together with the valence shell electron-pair repulsion (VSEPR) theory, valence bond and hybridisation are in fact not related to the VSEPR model.
A chemist reacted 17.25 grams of sodium metal with an excess amount of chlorine gas. The chemical reaction that occurred is shown.
Na + Cl2 → NaCl
If the percentage yield of the reaction is 88%, what is the actual yield? Show your work, including the use of stoichiometric calculations and conversion factors.
Answer:
The actual yield is 38.59g of NaCl
Explanation:
Balanced equation: 2Na+CI2-->2NaCl
actual yield= (percent yield*theoretical yield)/100
Theoretical yield=
17.25*(1/22.989769)*(2/2)*(58.442769)=43.8515
43.8515*0.88=38.59 grams of NaCl
The actual yield is 38.59g of NaCl
The theoretical yield of the reaction is obtained as 43.87 g. The percentage yield is given 88%. Then, the actual yield is 38.6 g.
What is percentage yield?The percentage yield in a reaction is the ratio of actual yield to the theoretical yield multiplied by 100. The balanced chemical equation equation of the reaction is :
[tex]\rm 2Na + Cl _{2} \rightarrow 2NaCl[/tex]
Atomic mass of Na = 23 g
2 Na = 46 g
molar mass of NaCl = 58.5 g
2 NaCl = 117 g.
46 g of sodium metal gives 117 g of NaCl. Hence, the mass of NaCl produced from 17.25 g of Na is :
(17.25 × 117) /46 = 43.87 g
Thus the theoretical yield of the reaction is 43.87 g.
The percentage yield = 88%
Hence, actual yield / theoretical yield = 0.88
Actual yield = 0.88 × 43. 87 = 38.6 g.
Therefore, the actual yield of the reaction is 38.6 g.
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How much potassium chloride will dissolve in 25 grams of water at 80°C?
Please I need help
Answer:
The problem provides you with the solubility of potassium chloride,
KCl
, in water at
20
∘
C
, which is said to be equal to
34 g / 100 g H
2
O
.
This means that at
20
∘
C
, a saturated solution of potassium chloride will contain
34 g
of dissolved salt for every
100 g
of water.
As you know, a saturated solution is a solution that holds the maximum amount of dissolved salt. Adding more solid to a saturated solution will cause the solid to remain undissolved.
In your case, you can create a saturated solution of potassium chloride by dissolving
34 g
of salt in
100 g
of water at
20
∘
C
.
Now, your goal here is to figure out how much potassium chloride can be dissolved in
300 g
of water at this temperature. To do that, use the given solubility as a conversion factor to take you from grams of salt to grams of water
Sugar is easily soluble in water and has a molar mass of 342.30 g/mol. What is the molar concentration of a 246.8 mL aqueous solution prepared with 72.1 g of sugar?
Answer:
.853 M
Explanation:
(72.1 g / 342.3 g/mole) / (246.8 ml /1000 ml/l )= .853 M
PLEASE HELP NOW! will give brainliest
1.You can warm your back muscles with a heating pad. As the pad heats up, it transfers heat to the part of your body that it is in contact with. This is an example of what type of energy transfer?
2.As warm air blows over the surface of the ice, it increases the temperature of the ice’s outer layer. This is an example of what type of energy transfer?
Answer:
1. Conduction
2. Convection
Explanation:
1. Conduction is the transfer of energy from one end of something to the other. Since the pad is heating up your back and no fluids or gasses are involved it is conduction.
2. Convection is the transfer of energy through air. Since the air is transferring its energy to the ice it is convection.
5. Most frogs live both in water and on land, leading to a variety of characteristics. How does a frog us
its lungs to survive in one of these environments? (SC.5.L. 17.1)
A. They allow the frog to breathe underwater.
B. They allow the frog to breathe on land.
C. They allow the frog to maintain a constant body temperature.
. They allow the frog to use less energy when jumping long distances.
•••“*Pls Help Me*”•••
Answer: I believe the answer is B
Explanation:
because over time sediment breaks down
Answer:
see below
Explanation:
tetonic plate movement is gradual...then there is suddenly an eathquake to relieve pressures in the plates
Which of the following would have the best thermal insulation properties?
A. A thick mug
B. A cup made of metal
C. A paper cup
D. A plastic cup
Answer:
D. A plastic cup
Can anyone help me? :)
Worth 30 points to first right answer!
would you prefer to live your dream forever or sacrifice you living your dream to let everyone else live their dream forever (brainliest)
I would perfer to prefer to live my dream forever because I wouldn't let someone be stuck with my dream forever because I would rather tourture my self other than to toutour everybody else.
I would rather let everyone else live their dream, because living a dream forever after a certain point would get boring, no matter how fun it seems. Additionally, just because I sacrifice me having my dream doesn't mean I wouldn't be able to enjoy life. It just means that I wouldn't be able to live out my best scenario.
What is the balanced chemical equation for wood burning
Answer:
P + O2 --> P2O5
Explanation:
For a simple match burning you can use the following equation: P + O2 --> P2O5 To balance the reaction you have to make sure you have the same amount of each element on both sides.
Please help..
1. How much water could you get if you started with 250.0 grams of hydrogen?
2. How much water could you get if you started with 250.0 grams of oxygen?
3. How much propane would you need to produce 1000.0 grams of water?
4. How much of each reactant is needed to produce 150 grams of hydrogen gas?
Molar mass of 2H2, O2 and 2H2O is 4g, 32g and 36 g per moles respectively.
That is , 4g of H2 = 36g of water
250g of H2 = xg of water
Make xg the subject of formula,
xg = 250× 36/4
xg = 9000/4
xg = 2250g of water
From the balanced equation for water formation: 2H2 + O2 ---> 2H2OMolar mass of 2H2, O2 and 2H2O is 4g, 32g and 36 g per moles respectively.
32g of oxygen = 36g of water
250g of oxygen = xg of water
Make xg the subject of formula,
xg = 250 × 36/32
xg = 9000/32
xg = 281.25g of water
The balanced chemical equation for the combustion of propane is:C3H8(g)+5O2(g)→3CO2(g)+4H2O(g).
Molar mass of propane and water is 44g and 72g per mole.
if 44g of propane = 72 g of water
xg of propane = 1000g of water
make xg the subject of formula,
xg = 44 × 1000/72
xg = 44000/72
xg = 611g of propane
The electrolysis of water can be used to the form hydrogen gas. The balanced equation is listed below:2 H2O → 2H2 + O2
Molar mass of 2H2O and 2H2 is 36g and 4g respectively.
If 36g of water = 4g of Hydrogen
xg of water = 150 g of hydrogen
Make xg the subject of formula,
xg = 36×150/4
xg = 5400/4
xg = 1350g of water
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Is it true you can make Napalm with diesel and styrofoam?
Answer:
Yes. Diesel works the best.
Explanation:
Homemade Napalm can be made using the following procedures; Using an enormous container, fill it about halfway with gasoline. Which means Diesel works the best. Break the special soap, Styrofoam(polystyrene), plate into small pieces.
Which of these is NOT true about sandy soil?
A) It's gritty to the touch.
B) It crumbles, even when wet.
C) It's made of large particles.
D) It supports many kinds of plants.
What volume of 1/5 M and 1/8 M HCl solution must be mixed to obtain 3 L of 1/7 M HCl?
0.72 L and 2.28 L of 1/5 M and 1/8 M HCl solution are required respectively to obtain 3 L of 1/7 M HCl.
What is the concentration of a solution?The concentration of a solution is the amount of substance a given volume of the solution of that substance.
The final concentration and volume of the mixture is 3 L of 1/7 M HCl.
Let the volume of 1/5 M and 1/8 M HCl solution required be X and Y respectively.
X + Y = 3 L
Liters of y = 3 -
[.0.2 X + 0.125 * (3-X)] / 3 = 1/7
(0.2X + 0.375 - 0.125X) / 3 = 1/7
(0.075 X / 3) = 1/7 - 0.375/3
(0.075X / 3) = 0.018
Multiplying both sides by 3
0.075 X = 0.054
X = 0.72 L
Y = 2.28 L
Therefore, 0.72 L and 2.28 L of 1/5 M and 1/8 M HCl solution are required respectively.
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Which of the following is NOT a skill scientists use to learn about the world? a. Predicting c. Inferring b. Observing d. Scientists use all of the above skills Please select the best answer from the choices provided A B C D
what neutral organic compound has oxygen carbon and hydrogen
Answer:
Carbohydrates
Explanation:
Carbohydrates are organic compounds that contain only carbon, hydrogen, and oxygen. They are the most common of the four major types of organic compounds. There are thousands of different carbohydrates, but they all consist of one or smaller units called monosaccharides.
Answer:
See below ~
Explanation:
Alcohols : Such as ethanol (C₂H₅OH)Sugars : Such as glucose (C₆H₁₂O₆)Carboxylic Acids : Such as ethanoic acid (CH₃COOH)More knowledge about de the topic of momenclature of organic compounds
Answer:
The primary function of chemical nomenclature is to ensure that a spoken or written chemical name leaves no ambiguity concerning which chemical compound the name refers to: each chemical name should refer to a single sub
What type of system is associated with weather that has lots of clouds and thunderstorms with the possibility of tornadoes?
A.
low pressure system
B.
arctic system
C.
circulatory system
D.
high pressure system
Answer:
A. Low pressure system
Explanation:
A low pressure system allows for more cloud development. I think of it as in, since the clouds have low pressure on them they can do whatever they want but if the clouds have a high pressure on them, they tend to not do much and most of the time not even form.
I hope this helps, good luck :)