Answer: the destruction of the butterflies’ environment
Explanation:
A mutation that would result in darker wings will mean that the birds that prey on them will stop eating a lot of them so this won't lead to extinction.
A decrease in the birds that eat the butterflies will also mean that the butterflies will survive more because they will have less predators.
Overproduction of butterfly offspring means more butterflies so they will not go extinct.
If their habitat was destroyed however, the butterflies might find it hard to survive as any new environment they go to might not be suitable leading to their extinction.
Answer:
I believe it is c
Explanation:
Write a balanced half-reaction for the reduction of gaseous nitrogen N2 to aqueous hydrazine N2H4 in acidic aqueous solution. Be sure to add physical state symbols where appropriate.
Answer:
Explanation:
N₂ (g ) + 4H⁺( aq ) + 4e⁻ = N₂H₄ ( aq )
H⁺ ion comes from acidic medium . 4 positive charge on proton is balanced by 4 electron to make left hand side neutral because right hand side is neutral .
If the average atomic mass of hydrogen in nature is 1.0079, what does that tell you about the percent composition of H-1 and H-2 in nature
Answer:
That the isotope H-1 is the most abundant in nature.
Explanation:
Hello!
In this case, since the average atomic mass of an element is computed considering the mass of each isotope and the percent abundance each, for hydrogen we would set up something like this:
[tex]m_H=m_{H_1}*\%abund_{H_1}+m_{H_2}*\%abund_{H_2}[/tex]
Moreover, since the isotope notation H-1 and H-2 means that the atomic mass of H-1 is 1 amu, that of H-2 is 2 amu and the average one is 1.0079 amu, we can infer that the most of the hydrogen in nature is H-1 as the most of it composes the average hydrogen atom.
Best regards!
An element with a relatively large amount of electrons in the valence ring is considered to be a good conductor. True False
Answer:
False
Explanation:
In every substance, there is a valence band and there is a conduction band. The gap between the valence band and the conduction band determines Whether a substance is a conductor or an insulator.
Conductors have a narrow gap between the valence band and the conduction band while insulators have a large gap between conduction band and insulation band. However, elements with a large number of electrons in the valence band are non conductors.
How many moles are in 1.5 x 10^23 atoms of fluorine?
Answer:
0.052636002587839 moles
Explanation:
im not sure so sorry if u get it wrong...
A student pushes a textbook across a desk with a force of 6.0 N a distance of 0.3 m. How much work is done on the textbook? Also need the formula and how to do it. Please help
Explanation:
Work done = Force * Diatance
By applying this equation,
We have Work Done = (6.0N)(0.3m) = 1.8J.
Answer:
1.8 J is the right answer.Explanation:
Formula used : Work = Force × Displacement
Work done = 6.0 Newton×0.3 meters = 1.8 joules
can u pls help me with this question
THIS ANSWER CORRECT?
Answer:
yes
Explanation:
Answer:
im pretty sure! good job :))
Explanation:
im sorry if it isnt in advance, hope this helped a little!
How does the environment play an important role in creating petrified fossils?
Cold environment prevents fossils from being created.
The right conditions need to be present in order for fossilization to occur.
All fossils are created in the same type of environment.
Hot environment prevents fossils from being created.
How does the environment play an important role in creating petrified fossils?
Answer:The right conditions need to be present in order for fossilization to occur.
Drier environments, such as land, are more susceptible to the effects of erosion and so it is more difficult to preserve the organism before it decays.
#CARRYONLEARNING #STUDYWELLcan u pls help me with this question
Answer:
D.
Explanation:
Well waves forming in not an indication of a phase change, neither is splashing water. Water soaking into the sand could be a form of change, from condensation into precipitation but that is not what the example is speaking of. The change from water into vapor can be indicated by the loss of water in liquid form.
0.2 mol of hydrocarbons undergo complete combustion to give 35.2 of carbon dioxide and 14.4g of water as the only product. What is the molecular formula of hydrocarbon
Answer:
[tex]\rm C_4 H_8[/tex].
Explanation:
Look up the relative atomic mass of [tex]\rm C[/tex], [tex]\rm H[/tex], and [tex]\rm O[/tex] on a modern periodic table:
[tex]\rm C[/tex]: [tex]12.011[/tex].[tex]\rm H[/tex]: [tex]1.008[/tex].[tex]\rm O[/tex]: [tex]15.999[/tex].Calculate the molecular mass of [tex]\rm CO_2[/tex] and [tex]\rm H_2O[/tex]:
[tex]M(\mathrm{CO_2}) = 12.011 + 2 \times 15.999 = 44.009\; \rm g \cdot mol^{-1}[/tex];
[tex]M(\mathrm{H_2O}) = 2 \times 1.008 + 15.999 = 18.015\; \rm g \cdot mol^{-1}[/tex].
Given the mass [tex]m[/tex] of [tex]\rm CO_2[/tex] and [tex]\rm H_2O[/tex] produced, calculate the number of moles of molecules that were produced:
[tex]\displaystyle n(\mathrm{CO_2}) = \frac{m(\mathrm{CO_2})}{M(\mathrm{CO_2})} \approx 0.80\; \rm mol[/tex];
[tex]\displaystyle n(\mathrm{H_2O}) = \frac{m(\mathrm{H_2O})}{M(\mathrm{H_2O})} \approx 0.80\; \rm mol[/tex].
Calculate the number of moles of [tex]\rm C[/tex] atoms and [tex]\rm H[/tex] atoms in these [tex]\rm CO_2[/tex] and [tex]\rm H_2O[/tex] molecules.
Each [tex]\rm CO_2[/tex] molecule contains one [tex]\rm C[/tex] atom. Therefore, that [tex]0.80\; \rm mol[/tex] of [tex]\rm CO_2\![/tex] contains [tex]0.80\; \rm mol\![/tex] of [tex]\rm C\![/tex] atoms.Each [tex]\rm H_2O[/tex] molecule contains two [tex]\rm H[/tex] atoms. Therefore, that [tex]0.80\; \rm mol[/tex] of [tex]\rm H_2O\![/tex] contains [tex]2 \times 0.80\; \rm mol = 1.60\; \rm mol[/tex] of [tex]\rm H\![/tex] atoms.The combustion reaction here include two reactants: the hydrocarbon and [tex]\rm O_2[/tex].
As the name suggests, hydrocarbons contain only [tex]\rm C[/tex] atoms and [tex]\rm H[/tex] atoms. On the other hand, [tex]\rm O_2[/tex] contains only [tex]\rm O[/tex] atoms.
Therefore, all the [tex]\rm C[/tex] and [tex]\rm H[/tex] atoms in those [tex]\rm CO_2[/tex] and [tex]\rm H_2O[/tex] molecules are from the unknown hydrocarbon. (With a similar logic, all the [tex]\rm O[/tex] atoms in those combustion products are from [tex]\rm O_2[/tex].)
In other words, that [tex]0.20\; \rm mol[/tex] of this unknown hydrocarbon molecules contains:
[tex]0.80\; \rm mol[/tex] of [tex]\rm C[/tex] atoms, and [tex]1.60\; \rm mol[/tex] of [tex]\rm H[/tex] atoms.Hence, each of these hydrocarbon molecules would contain [tex](0.80\; \rm mol) / (0.20\; \rm mol) = 4[/tex] carbon atoms and [tex](1.60\; \rm mol) / (0.20\; \rm mol) = 8[/tex] hydrogen atoms.
The molecular formula of this hydrocarbon would be [tex]\rm C_{4} H_{8}[/tex].
Please help me 17 points!
Answer:
A dam: 3
solar cells: 2
food: 1
a rocket: 1
Answer:
1: yes
Explanation:
Fill in the blank. Particles in a metal are held together by __________ attractions.
Particles in a metal are held together by Covalent attractions. These are the strongest attraction or types of bonding
Covalent bonding:The bonds that hold atoms together to form molecules are called covalent bonds. They are pretty tough and not easily made or broken apart. It takes energy to make the bonds and energy is released when the bonds are broken.
For example, there is a covalent bonding between a Chlorine molecule. the two chlorine atoms are held strongly via covalent bonds.
Find more information about Covalent bonding here:
brainly.com/question/11674395
Baking soda is a critical component of chemical
spill kits. Why would a chemist need baking soda to
help clean up spills?
HELPPPPP NOWWW
You have 8 red M&Ms, 6 brown M&Ms, 4 yellow M&Ms, and 3 green M&Ms.
What percent of M&Ms are brown?
Answer to 1 Decimal Place (Check your rounding)
Answer:
the answer is : 28.6
1: 8+6+4+3 =21
2: there are 6 brown M&Ms = 6
3: %= 100
6×100÷21 = 28.57
round 1 Dec place = 28.6
What is true if a liquid and a gas are in equilibrium?
O A Liquid molecules forming a gas and gas molecules forming a
liquid are equal in number.
O B. Liquid molecules are continually forming to replace escaping gas
molecules.
C. The liquid molecules stay liquid, and the gas molecules stay gas.
O D. The number of liquid molecules and the number of gas molecules
vary
Answer:
A - Liquid molecules forming a gas and gas molecules forming a
liquid are equal in number.
Explanation:
A P E X
How does an objects speed affect its kinetic energy?
how is the phenomenon of refraction useful to humanity
Answer:
Yes, it does have an important role in humanity!
Explanation:
In human life, refraction of light plays an important role. It has many applications in optics and imaging technology. Some of the applications are: Refraction concave and convex glasses are used to correct the refractive errors of human eyes.
its use full to humanity if you stay back jk
How many liters of oxygen are necessary for the combustion of 425 g of sulfur, assuming that the reaction occurs at STP
Answer:
V = 296.6 liters of oxygen.
Explanation:
The reaction of combustion of sulfur is:
O₂(g) + S(s) → SO₂(g) (1)
To find the volume of the oxygen we need to use the Ideal Gas Law:
[tex] V = \frac{n_{O}RT}{P} [/tex] (2)
Where:
V: is the volume
[tex]n_{O}[/tex]: is the number of moles of oxygen
R: is the gas constant = 0.082 L*atm/(K*mol)
T: is the temperature = 273 K (at STP)
P: is the pressure = 1 atm (at STP)
So we need to find the number of moles of oxygen that reacts with sulfur:
[tex]n_{S} = \frac{m}{M}[/tex]
Where:
[tex]n_{S}[/tex]: is the number of moles of sulfur
m: is the mass of sulfur = 425 g
M: is the molar mass of sulfur = 32.065 g/mol
[tex]n_{S}=\frac{m}{M} =\frac{425 g}{32.065 g/mol} = 13.25 moles[/tex]
From reaction (1) we have that 1 mol of O₂ reacts with 1 mol of S, hence the number of moles of oxygen is:
[tex] n_{S} = n_{O} = 13.25 moles [/tex]
Finally, the volume of oxygen is (equation (2)):
[tex]V = \frac{13.25 moles*0.082 L*atm/(K*mol)*273 K}{1 atm} = 296.6 L[/tex]
Therefore, are necessary 296.6 liters of oxygen for the combustion of sulfur.
I hope it helps you!
How many moles are in 64 grams of Ca(NO3
)2
Answer:
0.39 moles
Explanation:
Given mass of calcium nitrate =64gram
Molar mass of calcium nitrate = 164 gram
No of moles = given mass/ molar mass
No of moles = 64/164
= 0.39 moles
which group name do the non-metals in group 18 have?
Answer:
The elements of group 18 of the periodic table are known as noble gases or inert gases.
Explanation:
The noble gases are placed in group 18 of the periodic table. These gases have a very low chemical reactivity, that is, little combination with other elements of the periodic table. For that reason they are called inert gases. This behavior is due to its electronic configuration, because its outermost layer or valence layer is always complete, being the stable element by itself, without the need to borrow or share electrons.
As mentioned, noble gases are not very reactive, that is, they do not usually form bonds between atoms. This means that they don't react much with other substances, they don't even react between atoms of the same gas.
In summary, the elements of group 18 are non-reactive elements.
Finally, the elements of group 18 of the periodic table are known as noble gases or inert gases.
Determine the Oxidation number of the indicated element in each of the following substances: Mn in KMnO4 S in SO2 C in COCl2 P in PF4 O in K2O2
Answer:
1. Mn = +7
2. S = +4
3. C = +4
4. P = +4
5. O = -1
Explanation:
The oxidation number of each element in a compound is as follows:
1. Mn in KMnO4
KMnO4 = 0
Where; K = +1, O = -2, Mn = x
+1 + x -2(4) = 0
1 + x - 8 = 0
x - 7 = 0
x = +7
2. S in SO2
SO2 = 0
Where; S = x, O = -2
x + -2(2) = 0
x - 4 = 0
x = +4
3. C in COCl2
COCl2 = 0
Where; C = x, O = -2, Cl = -1
x + -2 + -1(2) = 0
x + -2 + -2 = 0
x -2 - 2 = 0
x - 4 = 0
x = +4
4. P in PF4
PF4 = 0
Where; P = x, F = -1
x + -1 (4) = 0
x - 4 = 0
x = +4
5. O in K2O2
K2O2 = 0
Where; K = +1, O = x
+1(2) + x(2) = 0
2 + 2x = 0
-2x = 2
x = -1
I need help asap please help me
Balance the equation.
P + 02 --> P4O10
Answer:
4P + 5O₂ —> P₄O₁₀
Explanation:
From the question given above, we obtained:
P + O₂ —> P₄O₁₀
The above equation can be balance as illustrated below:
P + O₂ —> P₄O₁₀
There are 4 atoms of P on the right side and 1 atom on the left side. It can be balance by 4 in front of P as shown below:
4P + O₂ —> P₄O₁₀
There are 10 atoms of O on the right side and 2 atoms on the left side. It can be balance by putting 5 in front of O₂ as shown below:
4P + 5O₂ —> P₄O₁₀
Now the equation is balanced.
Use the drop-down menus to identify the parts of DNA.
Label A:
Label B:
please help.
which element is the least reactive? Neon, Chlorine, Gallium or Tin
if an exothermic reaction takes place in an insulated container at the end of the reaction the temperature of the content of the container will
Answer:
Remain the same.
Explanation:
The reaction of the temperature of the content of the container will remain the same because no heat energy is transfer from the container to the external environment due to insulating material of the container. Insulators are poor conductor of heat and electricity so the container is unable to absorb the heat energy produced during a chemical reaction and all energy of the product remain the same.
Select the correct answer.
Which phrase correctly describes temperature?
A.
average rotational kinetic energy of the particles in an object
B.
average energy of the particles in an object
C.
average translational kinetic energy of the particles in an object
D.
all energy possessed by the particles in an object
Answer:
C. average transnational kinetic energy of the particles in an object.
Explanation:
Temperature measures the average kinetic energy of the particles in a substance. Thermal energy measures the total kinetic energy of the particles in a substance. The greater the motion of particles, the higher a substance's temperature and thermal energy. Therefore we could say that the average kinetic energy of a gas particle is directly proportional to the temperature. Hence an increase in temperature increases the speed in which the gas molecules move. All gases at a given temperature have the same average kinetic energy.When a chemical change occurs _____.
Need ASAP please someone
Select one:
a. atoms are rearranged
b. the law of conservation of mass is always obeyed
c. the chemical properties of new substances are different from the ones you started with
d. all of these
Answer:
d
Explanation:
i think its d but im not sure.
What happens when a gas gets hot
Heating a gas increases the kinetic energy of the particles, causing the gas to expand. In order to keep the pressure constant, the volume of the container must be increased when a gas is heated.
CHEMISTRY HELP! Lewis structure rules
Please help, is this correct?
Answer:
it is the one below that. NO, because it debt net the octet rule