Answer:
It is a physical change.
Explanation:
Answer:
its a physical change
Explanation:
physical changes no new substance is formed. so in this case it's still water just a change in color
For each item, choose whether the change is a physical change or a chemical change.
exploding firecracker:
mowing grass:
breaking a window:
spreading butter on toast:
burning wood in a fireplace:
acid rain corroding gravestones:
Answer:
Explanation:
Exploding Firecracker - Chemical Change
Mowing Grass - Physical Change
Breaking a Window - Physical Change
Spreading butter on toast - Physical Change
burning wood in a fireplace - Chemical Change
acid rain corroding gravestones: Chemical Change
In a physical change, the chemical composition is not altered, easily reversible and no new substance is formed.
In a chemical change, the chemical composition of the substance is altered. Not reversible and a new substance is always formed at the end of the reaction.
Which compound is responsible for the smell that is associated with the decomposition of dead animals? acetic acid butanoic acid cadaverine dimethylether
Answer:
cadaverine
Explanation:
Cadaverine is a chemical compound with the IUPAC name of pentane-1,5-diamine. It is a chemical compound that emits a foul odour when decomposers like bacteria act on dead animal tissues.
Cadaverine is a product of protein hydrolysis by bacteria in dead tissues, specifically when amino acid LYSINE is decarboxylated. Hence, cadaverine is the compound responsible for the terrible smell produced when a dead animal is being decomposed.
How many grams of carbon dioxide does a hummingbird emit daily?
Answer:
3.5 g CO2
Explanation:
A hummingbird emits up to 3.5 grams of CO2 a day.
Equation:7.9 x 10‒2mol CO2x (44.01 g CO2/ 1 mol CO2)
=3.5 grams
Hope this helps!
The porticos inside a ballon are experiencing increase in average
Answer:
The porticos inside a ballon are experiencing increase in average
What type of nuclear decay is shown by the reaction below?
2390 → He + 23% Th
O A. Fusion
B. Alpha
C. Beta
D. Gamma
Answer:
B. Alpha
Explanation:
Alpha decays always split into an element and He.
Beta decays always split into an element and e- (eletrons).
Gamma decays always split into an element and radiation.
Compound is the fundamental type of matter that has unique set of properties and cannot be broken down into simpler form.
Answer: Compound
Explanation: pure substance that cannot be broken down into simpler substances by chemical or physical means. Each element has unique physical and chemical properties.
4. Which change to a DNA molecule would have the least effect on an organism?
A: an addition to a base sequence at the beginning of a gene
B: a substitution in a base sequence that does not code for a protein
C: a substitution that creates a "stop" code in the middle of a gene
D: a deletion from a base sequence in the middle of a gene
Answer: Change in a single nitrogen base in the DNA sequence will not have any significant effect on the organism.
So A
Explanation:
This is known as point mutation and it does not have any significant change in the protein and it is least harmful type of DNA mutation.
Scientific evidence shows that Earth's diameter, and thus overall size, does.
not change. This evidence goes against which two theories?
A. Expanding Earth
B. Plate tectonics
U
C. Contracting Earth
D. Continental drift
SUBMIT
Answer:
Expanding earth and contracting earth
Explanation:
Answer:
A and C
Explanation:
Which statement describes an effect of large asteroid and comet impacts?
Answer:
They could cause an organism and population and species to die.
Explanation:
If the asteroid hits on ground, there would be a colossal amount of dust thrown up into the atmosphere and our world. If it hits in water and ocean , then there would be a huge surge in water vapor in the atmosphere. This would result in an increase in rain resulting in landslides and mudslides
what is the mass of one mole of Cl2
Answer:
70.906 g/mol
Explanation:
Answer:
71
Explanation:
mass = mole x molar mass (Mr)
= 1 x ( 35.5 + 35.5)
= 71
In which two places is aggregate generally found? A.floodplains and alluvial fans B.alluvial fans and mines C.mines and beneath the topsoil D.beneath the topsoil and above the topsoil ED2020
Answer:
A.floodplains and alluvial fans .
Explanation:
Hope it helps.
Answer:A)
Explanation:
how many bonds are present in NCl3
at 60C how much potassium nitrate can be dissolved in 400g of water
Answer:
About 110 g
Explanation:
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 degree celcius
start from the 60 degree celcius
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 degree celcius is equal to about
solubility ≈ 110 g / 100 mL water
−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
This tells you that a saturated solution of potassium nitrate will hold about
110 g of dissolved salt, i.e. of dissociated salt, per 100 ml of water at 60 degree celcius
A solution...
A. is a single-phase homogeneous mixture.
B. can contain more than two phases.
C. must contain water.
D. is always a liquid.
Answer:
A
Explanation:
Answer:
A
Explanation:
"It means of solving a problem or dealing with a difficult situation."
what’s that mass of 7.14 X 102 mol of PC13
Answer:
16.25 x 10^-20g
Explanation:
molar mass of PCl3
31(1)+3(35.5) = 137.5
n= mass/molar mass
7.14 x 10² = mass / 137.5
mass = 7.14 x 10² x 137.5
mass = 98175g
PLEASE HELP!
Why is phosphorus diamagnetic.
Answer:
FROM the magnetic point of view, phosphorus is an extremely interesting
substance because of its allotropic modifications. The ordinary forms are
the yellow (or white) and the red varieties. X-ray investigations indicate
that probably yellow phosphorus is analogous with the cubic forms of antimony and arsenic; and red phosphorus with monoclinic antimony and
arsenic (Mellor, 1928). The conclusions of different workers on the structure of red phosphorus are not in agreement. There is also Bridgman's black
phosphorus which is probably hexagonal (Linck and lung, 1925). Natta
and Passerini (1930) have studied the crystal structure of white phosphorus.
This substance when condensed at the temperature of liquid ammonia is
cubic. Atomic positions however are yet undetermined. Another and noncubic form is obtained by condensation at liquid-air temperatures. It is
thus clear that most likely white phosphorus is cubic in structure with a
probable superposition of another lattice.
The evidence from Raman effect also points to the same conclusion.
Bhagavantam (1930) investigated the Raman effect of white phosphorus in
the solid state. The characteristic frequencies obtained by him are 607, 468
and 374. Since the phosphorus molecule is known to contain 4 atoms,
Bhagavantam (1930) has shown that the tetrahedral structure fits the results
satisfactorily since such a structure would give only three frequencies. But
for the particular law of forces adopted, the frequencies should have the
ratio 2: 2: 1 but the observed frequencies deviate considerably.
Phosphorus is a really intriguing element. because of the allotropic changes to the material.
Why phosphorus is dimagnetic?Red phosphorus is likely akin to monoclinic antimony, while yellow phosphorus is probably similar to the cubic forms of antimony and arsenic.
There is disagreement among the findings of many researchers regarding the structure of red phosphorus. Additionally, Bridgman's black It is presumably hexagonal, phosphorous (Linck and lung, 1925). Natta and Passerini (1930) have investigated the white phosphorus crystal structure.
Condensed from this material at liquid ammonia temperature is cubic. However, the locations of the atoms are still unknown. Condensation at liquid air temperatures yields a different, noncubic shape.
Therefore, Phosphorus is a really intriguing element. because of the allotropic changes to the material.
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What goes in the rest?
Answer:
E. Mass number
H. Ion
F. Isotopes
I hope you have a great day. I'm sorry that I didn't know C or I.
7. Write a formula for each of the following:
(a) an alkane with 22 carbon atoms
(b) an alkene with 17 carbon atoms
(c) an alkyne with 13 carbon atoms.
Answer : The formula for each of the following is:
(a) [tex]C_{22}H_{46}[/tex]
(b) [tex]C_{17}H_{34}[/tex]
(c) [tex]C_{13}H_{24}[/tex]
Explanation :
Alkanes are hydrocarbon in which the carbon atoms are connected with single covalent bonds.The general formula of alkanes is [tex]C_n H_{2n+2}[/tex] where n is the number of the carbon atoms present in a molecule of alkane.
Alkenes are hydrocarbon in which the carbon atoms are connected with double covalent bonds.The general formula of alkenes is [tex]C_n H_{2n}[/tex] where n is the number of the carbon atoms present in a molecule of alkene.
Alkynes are hydrocarbon in which the carbon atoms are connected with triple covalent bonds.The general formula of alkynes is [tex]C_n H_{2n-2}[/tex] where n is the number of the carbon atoms present in a molecule of alkyne.
(a) An alkane with 22 carbon atoms
Putting n = 22 in the general formula of alkane, we get the formula of alkane as, [tex]C_{22}H_{2(22)+2}[/tex] or [tex]C_{22}H_{46}[/tex]
(b) An alkene with 17 carbon atoms
Putting n = 17 in the general formula of alkene, we get the formula of alkene as, [tex]C_{17}H_{2(17)}[/tex] or [tex]C_{17}H_{34}[/tex]
(c) An alkyne with 13 carbon atoms
Putting n = 13 in the general formula of alkyne, we get the formula of alkyne as, [tex]C_{13}H_{2(13)-2}[/tex] or [tex]C_{13}H_{24}[/tex]
Answer:
[tex]\huge \boxed{{C_{22} H_{46} \ \ \ \ C_{17} H_{34} \ \ \ \ C_{13} H_{24}}}[/tex]
Explanation:
[tex]alkanes \ \Rightarrow \ C_n H_{2n+2}[/tex]
[tex]C_{22} H_{2(22)+2}[/tex]
[tex]C_{22} H_{44+2}[/tex]
[tex]C_{22} H_{46}[/tex]
[tex]alkenes \ \Rightarrow \ C_n H_{2n}[/tex]
[tex]C_{17} H_{2(17)}[/tex]
[tex]C_{17} H_{34}[/tex]
[tex]alkynes \ \Rightarrow \ C_n H_{2n-2}[/tex]
[tex]C_{13} H_{2(13)-2}[/tex]
[tex]C_{13} H_{26-2}[/tex]
[tex]C_{13} H_{24}[/tex]
Which answer below correctly identifies the type of change and the explanation for the boiling of water?
o physical change because even though the change caused the temperature of the water to
increase, the water's physical properties remained exactly the same
o physical change because even though gas formation was observed, the water was undergoing a
state change, which means that its original properties are preserved
chemical change because gas formation was observed, which indicated that the water was
transformed into a different substance
O chemical change because a temperature change was observed, which indicated that the water
was transformed into a different substance
Answer:
O chemical change because a temperature change was observed, which indicated that the water
Explanation:
I have taken this class
PLEASE HELP ASAP Florida is bordered by water on three sides. Which property of water helps moderate Florida’s coastal areas?
• low specific heat, which results in fast, large changes in water temperature
• high specific heat, which results in fast, large changes in water temperature
• low specific heat, which results in slow, small changes in water temperature
• high specific heat, which results in slow, small changes in water temperature
Answer:
i think its d
Explanation:
Answer:
High specific heat, which results in slow, small changes in water temperature
Explanation:
Just did it on Edge
Bird wings and dragonfly wings are both used for flight.
Answer:
Yes
Explanation:
What's the question?
Answer:
yes, they both use it to fllight.
Explanation:
As they are adapted to flight to various places to catch their prey and be safe from various type of harms.
hope it helps..
To draw a Lewis structure for a polyatomic ion, begin by calculating A, the available electrons, and N, the needed electrons. What is N for CIO3-, the chlorate ion?
Answer:
N for chlorate ion is one
Explanation:
Because N is the number of electrons needed to form octet structure causing a negative charge of one, since it already has 25valence electrons
Answer: 26
Correct Answer
Which compound is used to make asphalt? a saturated hydrocarbon that has more than 35 carbons in its chain a saturated hydrocarbon that has between 17 and 35 carbons in its chain a saturated hydrocarbon that has between 5 and 8 carbons in its chain a saturated hydrocarbon that has between 1 and 2 carbons in its chain
Answer:
answer is A. a saturated hydrocarbon that has more than 35 carbons in its chain
Explanation:
edge in 2020 :)
The compound which is used to make asphalt is a saturated hydrocarbon that has more than 35 carbons in its chain.
What is asphalt?Asphalt is also known by the name of bitumen, its appearance is sticky and black or present in semi solid form of petroleum.
Asphalt is a kind of hydrocarbon means mainly formed by the composition of carbon atoms and hydrogen atoms, but in very trace quantity amount of nitrogen, sulfur and other hateroatoms are also present. It is present in complex form means both saturated and unsaturated or aliphatic and aromatic compounds are present in it. It is formed by the long carbon chain which has a number of Carbon atoms around 150.
Hence it is a saturated hydrocarbon that has more than 35 carbons.
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Calculate the mass (in grams) of hydrogen gas produced when 33.61 g of
diborane (B2H) reacts with excess water.
B Holg) + 6H2O(1)→ 2 H3B03(s) + 6H2(g)
Only enter numerical value without units.
Answer:
14.40g of H2
Explanation:
The balanced equation for the reaction is given below:
B2H6(g) + 6H2O(l) → 2H3BO3(s) + 6H2(g)
Next, we shall determine the mass of B2H6 that reacted and the mass of H2 produced from the balanced equation. This is illustrated below:
Molar mass of B2H6 = (2x11) + (6x1) = 28g/mol
Mass of B2H6 from the balanced equation = 1 x 28 = 28g
Molar mass of H2 = 2x1 = 2g/mol
Mass of H2 from the balanced equation = 6 x 2 = 12g
From the balanced equation above,
28g of B2H6 reacted to produce 12g of H2.
Finally, we shall determine the mass of H2 produced when 33.61g of B2H6 reacted with excess water. This can be obtained as follow:
From the balanced equation above,
28g of B2H6 reacted to produce 12g of H2.
Therefore, 33.61g of B2H6 will react to produce = (33.61 x 12)/28 = 14.40g of H2.
Therefore, 14.40g of H2 were produced from the reaction.
Drag each label to the correct location. Match the climate zones to their relative temperature levels. (coldest zonehottest zonemoderate temperature zone)
Answer:
Polar Zones - Coldest Temperature
Temperate Zones - Moderate Temperature
Tropical Zones - Hottest Temperature
Explanation:
The closer you are to the Equator, the hotter it gets, as the sun hits the middle of the Earth the most. At the poles, the sun hits it there the least, so it is the coldest. In between, we would have a mild between hot and cold.
*Remember that the Earth is at a tilt, and that is why we have seasons and why the Equator is so hot and the Poles are so cold.
Answer:
I answered the question on edmentum and that person was correct.
Explanation:
The polar zone is the coldest because the Sun’s rays hit this part of Earth at a wide angle, causing their energy to be spread thinly over a large surface area.
The topical zone is the hottest because the Sun’s rays hit this part of Earth nearly straight on, focusing the heat on a small surface area.
The temperate zone experiences moderate temperatures because the Sun’s rays hit this zone at an angle that concentrates the heat on a surface area that is smaller than on the polar zone and larger than on the tropical zone.
Bi-S bond is relatively more stronger than Bi-N bond. How can you explain this with HSAB concept?
Answer:
A qualitative correlation between the extent of interaction between various Lewis acids and bases has been achieved by classifying the acids or bases into two classes: hard and soft in his theory of Hard and Soft Acids and Bases – HSAB. Acid-base reactions are then treated by the general principle that hard acids prefer to combine with hard bases and soft acids prefer to combine with soft bases (and vice versa). The criterion of hardness (or softness) is ascribed to the “hardness” of the electron cloud associated with any species. A firmly held electron-cloud with low polarizability makes a species “hard”, while an easily polarizable electron cloud characterizes the species as “soft”. A third category with intermediate character appears in the borderline.
Based on this information, tell us your best guess.
The Bi-S bond has been relatively stronger than the Bi-N bonds, as Bi has been a hard acid, and it combines more strongly with a hard base that is S.
The HSAB concept has been the hard and soft acid and base concept. The concept has also been termed the Pearson acid and base concept.
According to the concept, hard acids preferred to combine with the hard bases, and soft acids prefer to be combined with the soft bases. The concept gives the idea of the stability of the compounds.
The hard acids are the low electronegative, small ionic radius elements, while soft acids are large ionic radius, high positive charge.
The hard bases are the elements with a small radius and high electronegativity, while soft bases are the elements with a large ionic radius and high polarizability.
The given elements have been:
The Bi has been a hard acid.N has been a borderline base.S has been a hard base.Since hard acid tends to bond with a hard base, Bi tends to bond more strongly with S than N. Thus, the Bi-S bond has been stronger than the Bi-N bond.
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What trend does electronegativity follow,going down the periodic table?
Answer:
The answer is option C.
Hope this helps you
14.
Two jewelers were asked to measure the
mass of a gold nugget. The true mass of the
nugget is 0.856 grams (g). Each jeweler took
three measurements. The average of the
three measurements was reported as the
"official” measurement with the following
results:
Jeweler A: 0.863 g, 0.869 g, 0.859 g
Jeweler B: 0.875 g, 0.834 g, 0.858 g
Which jeweler's official measurement was
more accurate? Which jeweler's measure-
ments were more precise? In each case, what
was the error and percent error in the official
measurement?
Answer:
Jeweler B = more accurate
Jeweler A = more precise
Error:
0.008, 0
% error :
0.934% ; 0
Explanation:
Given that:
True mass of nugget = 0.856
Jeweler A: 0.863 g, 0.869 g, 0.859 g
Jeweler B: 0.875 g, 0.834 g, 0.858 g
Official measurement (A) = 0.863 + 0.869 + 0.859 = 2.591 / 3 = 0.864
Official measurement (B) = 0.875 + 0.834 + 0.858 = 2.567 / 3 = 0.8556
Accuracy = closeness of a measurement to the true value
Accuracy = true value - official measurement
Jeweler A's accuracy :
0.856 - 0.864 = - 0.008
Jeweler B's accuracy :
0.856 - 0.856 = 0.00
Therefore, Jeweler B's official measurement is more accurate as it is more close to the true value of the gold nugget.
However, Jeweler A's official measurement is more precise as each Jeweler A's measurement are closer to one another than Jeweler B's measurement which are more spread out.
Error:
Jeweler A's error :
0.864 - 0.856 = 0.008
% error =( error / true value) × 100
% error = (0.008/0.856) × 100% = 0.934%
Jeweler B's error :
0.856 - 0.856 = 0 ( since the official measurement as been rounded to match the decimal representation of the true value)
% error = 0%
Which best explains why a firework being ignited is an example of an exothermic reaction and not an endothermic reaction?
A)The fireworks produce colors.
B)The fireworks give off heat.
C)Igniting the fireworks requires energy
D)Igniting the fireworks makes an odor.
Answer:B
Explanation:
TOOK DA TEST
As the firework releases heat, it is considered as exothermic reaction. The correct option is B.
What is exothermic reaction?An exothermic reaction is one in which the energy required to break bonds in the reactants is less than the energy released when new bonds form in the products.
Energy is constantly released during an exothermic reaction, often in the form of heat. Exothermic reactions characterize all combustion reactions.
Endothermic reactions are chemical reactions that produce products by absorbing heat energy from their surroundings.
Exothermic reactions are important in forensic science, particularly in the investigation of fires and explosions.
Endothermic refers to a chemical reaction that requires heat and results in cooling of the surroundings.
As fireworks are releasing energy in the form of heat, it can be called as an exothermic reaction.
Thus, the correct option is B.
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hi:) how to do question 3?:)
Answer:
5
Explanation:
Distilled water has a pH of 7 while CO2 is slightly acidic and therefore if we combine both substances we should get a pH just below 7 which if 5
Answer:
A) 5
Explanation:
5
The pH of distilled water immediately after distillation is 7, but within hours after distillation, it has absorbed carbon dioxide from the atmosphere and become acidic with a pH of 5