Answer:
The position of the moon during its orbit around Earth
Answer:
the angle you look at it from
When a strong acid such as hcl is added to the carbonic acid buffer system, _________
When a strong acid such as HCl is added to the carbonic acid buffer system, more carbonic acid is formed.
What is a buffer system?A buffer system prevent the pH change and resist it when an acid or base is added to the solution.
A buffer system is prepared by weak acid or weak base and their salts. There are three types of buffer system present.
Carbonic acid bufferPlasma protein bufferPhosphate bufferThus, the correct option is b. More carbonic acid is formed.
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- How many grams of nitrogen (N2) are needed to react with 435.2 g of oxygen (02) in the following equation?
N2 + O2 → 2NO
N2= 28.02
02= 32
Explanation:
I think the answer is this for a better check mass- mass ratio in stoichiometry lesson
Yeast and sugar were added to lukewarm water and place in a flask. a balloon was stretched over the opening of the flask. small bubbles were observed rising along the side of the flask as the balloon slowly began to inflate. it can conclude that ...
Answer:
Bubbles indicate change
Explanation:
i don't know if i'm right but if im not its fine
Hope it helps<3
What is a chemical bond?
A. When electrons are shared between atoms
B. When protons are shared between atoms
D. When neutrons are shared between atoms
Sulfuric acid solid aluminum hydroxide to form liquid water and a solubale salt. What is the balance equation
Balanced chemical equation for the reaction between sulfuric acid & solid aluminum hydroxide to form liquid water and a soluble salt is 3H₂SO₄ + 2Al(OH)₃ Al₂(SO₄)₃ + 6H₂O.
What is balanced equation?Balanced chemical equations are those in which all entities are present in same amount on both sides of the chemical equation.
Balanced chemical reaction for the given compounds will be shown as:
3H₂SO₄ + 2Al(OH)₃ Al₂(SO₄)₃ + 6H₂O
Above chemical equation is the balanced equation as all atoms are present in same amount on the left side as well as on the right side of the reaction.
Hence balanced equation is 3H₂SO₄ + 2Al(OH)₃ Al₂(SO₄)₃ + 6H₂O.
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HELP ASAP, EASY QUESTION
The diagram above shows the position the Earth is in in relation to the Sun during each season. You are to match the number with the correct season listed below:
Explanation:
Winter 4
Season when the northern hemisphere is tilted away from the sun.
Summer 2
Season when the northern hemisphere is tilted towards the sun.
Spring 1
Season when the northern hemisphere is neither tilted towards nor away from the sun; days getting longer and warmer.
Fall 3
Season in the northern hemisphere when the Earth is neither tilted towards nor away from the sun; days getting shorter and cooler.
What is the mass of K-42 remaining in a 16-g sample
of K-42 after 37.2 h? (1) 1.0 g) 2.0 g (3) 8.0 g
(4) 4.0
The amount that is Left after 37.2 hr must be less than the original amount of K-42 initially present.
What is radioactivity?The term radioactivity has to do with the spontaneous disintegration of a substance.
To determine the mass of the K-42 that remains, we must have the half life of the isotope or the decay constant and both information are missing.
However, the amount that is Left after 37.2 hr must be less than the original amount of K-42 initially present.
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A solution is made by dissolving 50. g of ethyl alcohol in 336 g of water. what is the percent by mass of ethyl alcohol in the solution? (round your answer to 2 sig figs)
Answer:
13 %
Explanation:
(50 g) / (50 + 336 g) = .1295 or 13 %
Propose a reasonable synthetic strategy for the synthesis of e-6 methyl 3 heptene starting with 4 m ethyl 1 pentyne
A reasonable synthetic strategy for the synthesis of e-6 methyl 3 heptene starting with 4 methyl 1 pentyne is proposed below.
What is synthesis reaction?The artificial execution of chemical reactions to obtain one or more products is known as chemical synthesis.
Physical and chemical manipulations, usually involving one or more reactions, are used to achieve this. The procedure is repeatable and reliable in current laboratory settings.Synthetic strategy for the synthesis of e-6 methyl 3 heptene starting with 4 methyl 1 pentyne is shown in the image.
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If I have Oxygen gas at a pressure of 36.0 kPa, a volume of 38 L, and a temperature of 82 °C, how many moles of gas do I have? (Equation: K= 273+C),
PV=nRT
O 0.50 moles
O 0.40 moles
O 0.60 moles
O 0.46 moles
Answer:
.46 moles
Explanation:
PV = n RT make sure you use the correct R = 8.31446 L-kPa/(K-mol)
36 * 38 = n * 8.31446 * (273.15 + 82)
n = .463 moles
The electronegativity of the element affects all of the following except a- type of bond it forms with other elements b- the boiling point of its compounds c- the shape of the molecule it forms d- the ability of its compounds to dissolve in different solvents
The electronegativity of the element affects the ability of its compounds to dissolve in different solvents.
What is the meaning of electronegativity?Electronegativity is a measure of an atom's ability to attract shared electrons to itself.
Polar bonds have a positive and negative side to them, and therefore can attract water dipoles and dissolve in water.
If the polarities of the solvent and solute match (both are polar or both are nonpolar), then the solute will probably dissolve.
If the polarities of the solvent and solute are different (one is polar, one is nonpolar), the solute probably won't dissolve.
Hence, option D is correct.
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Mass = 10 g
Density = Mass/volume
Volume of a cube = (side length)3
Now that you have the side length, determine the volume. Then use the density formula to calculate the density of the material. Record your observations by selecting the data table icon.
You may use a calculator for this section.
Measurement1.1 cm
Answer:
If I understood correctly, your answer should be 0.64 grams
Explanation:
Because it is a polar molecule, water has _____.
A. capillary action
B. solubility
C. cohesion
D. adhesion
E. All of the above
Answer: Cohesion
Explanation: Because cohesion refers to the attraction of molecules for other molecules of the same kind, and water molecules have strong cohesive forces thanks to their ability to form hydrogen bonds with one another.
What volume is occupied by 0. 445 mol of co2 at 397. 0 k and 973 mmhg?
The volume which is occupied by 0.445 mol of carbon dioxide at 397K and 973mmHg is 11.32 L.
What is ideal gas equation?Ideal gas equation will be represented as:
PV = nRT, where
P = pressure = 973 mmHg = 1.28 atm
V = volume = ?
n = moles = 0.445 mol
R = universal gas constant = 0.082 L.atm / K.mol
T = temperature = 397 K
On putting all these values, we get moles as:
V = (0.445)(0.082)(397) / (1.28) = 11.317 = 11.32 L
Hence required volume of gas is 11.32 L.
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Classify each of the following species as a lewis acid or a lewis base
Lewis acid and base are the chemical species that accept and donate pairs of electrons. Boron trifluoride, copper ion, and sulfur dioxide are lewis acids, and iodide ion and water are lewis bases.
What are lewis acids and lewis base?Lewis acids are the chemical species that accept the nonbonding electron pair from other chemical species. Hence is an electron-pair acceptor. Boron trifluoride, copper ion, and sulfur dioxide are lewis acids as they can accept an electron to complete an octet.
Lewis bases are the chemical species that donate the non-bonding electron pair to the other chemical species. Hence is an electron-pair donor. Halogen or the iodide and water is a lewis base as it is an electron-rich species.
Therefore, water and iodide is lewis base.
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Which example is an exothermic reaction?
A. dissolving ammonium nitrate in water to cool the water
B. melting ice
C. condensation
D. dissolving sugar in water
Answer:
C. Condensation
Explanation:
When molecules release heat energy, it is called exothermic. In this case, condensation would be an example of this.
Answer: it is C condensation
Explanation: I took the quiz
Hope this helps
Hane a nice day
Could you mark me as branly if you could thank you :)
importance achievements of chemistry
Answer:
Chemistry is essential for meeting our basic needs of food, clothing, shelter, health, energy and clear air, water and soilChemistry helps you to understand the world around you Chemistry is a heart of cooking A command of chemistry can keep you safeSome important achievements of chemistry includes discovery of oxygen ;Atomic Theory; Atoms Combine Into Molecules ;Synthesis of Urea; Chemical Structure ; Periodic Table of the Elements; Electricity Transforms Chemicals ; The Electron etc.
Chemistry is a field of science which deals with the chemicals present in laboratory or in our environment o related to human body also.
There are main 3 branches of chemistry that is organic and inorganic and physical chemistry some others are too like analytical chemistry ,industrial chemistry , pharmaceutical chemistry.
Organic chemistry deals with the carbon compounds and hydrogen compound inorganic chemistry deals with the elements of periodic table and pharmaceutical makes medicines for human health care. The reasons for people to pursue discoveries in chemistry because it is the most important part of daily life and related to the human health too.
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The complete question
Mention some important achievements of chemistry
3c reaction time =138.5 sec reation rate=
Answer:
Compute the reaction rate to the nearest whole number using the formula below,
mass of tablet/volume of water
Reaction Rate = mas
reaction time
3°C Reaction time = 138.5 sec
Reaction rate = mg/l/sec
24°C Reaction time = 34,2 sec
Reaction rate = mg/L/sec
40°C Reaction time = 26.3 sec
Reaction rate = mg/L/sec
65°C Reaction time = 14.2 sec
Reaction rate = mg/L/sec
Explanation:
I hope my answer help
Answer:
#1 is 36 (138.5 seconds)
#2 is 146 (34.2 seconds)
#3 is 190 (26.3 seconds)
#4 352 (14.2 seconds)
#5 is 145 (34.5 seconds)
#6 is 173 (28.9 seconds)
#7 is 216 (23.1 seconds)
Explanation:
Edge, we may have different orders.
Question 1-6
What is the molality of a solution prepared by dissolving 13.0 g of Ba(NO3)2 in 450 g of water?
1. 0.029 molal
c. 0.11 molal
b. 29 molal
d. 1.1 x 10 4 molal
Answer:
Freezing point depression is a property of solutions where the solute lowers the normal freezing point of the solvent.
is the earth getting hotter
What is a solution?
A. A mixture in which the parts are chemically combined
a
B. Any combination of a liquid and a solid
C. A liquid that contains solid particles unevenly distributed
throughout it
D. A mixture that has the same composition throughout
Answer:
A !!
it a mix where everything is combined together
What volume does 0.03 mol of N2 gas occupy at a temperature of 176°C and a pressure of 269 mm Hg?
Answer:
3.12 L
Explanation:
Given the R value that is supplied
you will need to convert to atm from mm Hg and C to K
269 mm / 760 mm/atm = .354 atm
176 c = 449.15
PV = n RT
V = n RT / P = .03 * .08206 * 449.15 / .354 = 3.12 L
A gas has a volume of 72.1 liters at 58.3 atm. The final volume is 101.0L, what is the new pressure?
Answer:
X is an element in period 3 with two electrons in the outer shell
100 POINTS!!
Based on what we have learned match the correct items with their counterparts.
Answer:
I beileve it is NORTH KOREA!! XD actually D.
Explanation:
A balloon with volume of 0.40 liters is at a temperature of 293 K. If the balloon is heated to 523 K, then what will the new volume be?
v=293+523
v=816
this is the answer
thank you
A 1.0 g mixture of magnesium chloride and sodium nitrate is dissolved in water. then an excess of silver nitrate solution is added and a precipitate is collected and dried. the mass of the precipitate is 1.43 g. what is the percentage of magnesium chloride in the original mixture
The percentage of magnesium chloride in the original mixture is 25.529 %.
What is silver nitrate?Silver nitrate is an organic compound. It is used in treating wounds and infection of the skin.
A 1.0 g mixture of magnesium chloride and sodium nitrate.
The mass of the precipitate is 1.43 g.
Thus, the percentage of magnesium chloride in the original mixture is 25.529 %.
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PLEASE HELP!!
What is the activation energy of this reaction?
50 kJ
100 kJ
150 kJ
200 kJ
Answer:
50 kJ
Explanation:
Activation energy is the energy to go from reactants at 150 to 200 kJ
= 50 kJ
rank the following pressures from highest to lowest a)736 mmHg b)0.928 atm c
)1.12*10^5 Pa d)728 torr
The rank of the pressure from highest to lowest are c, 1.22 x 10⁵ Pa < a, 736 mm hg < b, 0.928 < d, 728 torrs.
What is pressure?The force applied perpendicular to any object is the pressure.
First, we convert all the quantities into atm.
1. 1 mmHg = 0.00131579atm/mmHg
736mmHg = 0.96843 atm
2. 1 torr = 0.00131578947 atm/ torr
728 torr = 0.9579 atm
3. 1 pascal = 9.87 x 10⁻⁶
1.12 x 00000pa = 1.105 atm
So given value in atm are-a) 96843 atm b) 0.98atm c) 0.9579 aim d) 1105 atm.
SO, the order will be c<a< b<d.
Thus, the order will be c<a<b<d.
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Identify the atom below.
a.) H
b.) He
c.) Bе
d.) С
How many moles of solute are in 125 mL of a 2.0 M hydrochloric acid (HCI) solution?
if answer 1 point . plsss fast daddddy
[tex]\sf\large \green{\underbrace{\red{Answer⋆}}}:[/tex]
0.250 moles
Explanation:
First we will convert quantity of solution into liters
[tex] \implies \sf 125 \: ml \times {10}^{ - 3} = 0.125 \: l[/tex]
Now we will use morality formula
[tex] \sf molarity = \frac{no \: of \: moles}{volume} \\ \\ \sf no \: of \: moles = molarity \times volume[/tex]
Here volume(quantity) = 0.125 l
AND no. of moles(given) = 2.0M
[tex] \sf \implies no \: of \: moles = 2 \times 0.125 \\ \\ \sf \implies no \: of \: moles = 0.250 \: moles \: of \: HCl[/tex]
[tex]~~~~~~w = \dfrac{SVM}{1000}\\\\\\\implies nM = \dfrac{SVM}{1000}\\\\\\\implies n= \dfrac{SV}{1000}\\\\\\\implies n = \dfrac{125 ~ \text{mL}\times 2.0~ \text{M}}{1000}\\\\\\\implies n = \dfrac{250}{1000}\\\\\\\implies n = 0.25~ \text{mol.}\\\\\text{The number of moles is 0.25.}[/tex]