Answer:
oxygen and tempature
Explanation:
Darwin proposed the “theory of evolution by natural selection” in which he stated that certain members of species have adaptations to help them _____ while other members who don’t have the helpful adaptation die out.
PLS HELP ME! WHAT DOES IN THE MISSING BOX??!
ILL GIVE U 5 STARS JUST HELPPP
Answer:
survive
.............
which of the following acts as a catalyst in catalytic converters?
A. Wood
B. Metal
C. Water
D. Gas
Answer:
B. Metal
Explanation:
The catalyst used in the converter is mostly a precious metal such as platinum, palladium and rhodium. Platinum is used as a reduction catalyst and as an oxidation catalyst. Although platinum is a very active catalyst and widely used, it is very expensive and not suitable for all applications.
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Calculate the following:)
Answer:
I think it's 1.55 x 10^40
Explanation:
i hope dis helps<3
2. How many moles of carbon dioxide are there in 1.34 x1021 molecules of CO,?
Answer:
0.00223mol
Explanation:
The number of molecules of CO2 (nA) can be used to determine the number of moles it contain by dividing by Avagadros number (6.02 × 10^23 atoms)
That is;
number of moles (n) = nA of CO2 ÷ 6.02 × 10^23
According to this question, there are 1.34 x10^21 molecules of CO2, hence,
n of CO2 = 1.34 x10^21 ÷ 6.02 × 10^23
n = 1.34/6.02 × 10^21-23
n = 0.223 × 10^-2
n = 0.00223mol of CO2
what does the J.J.Thomson model represent?
Answer:
J.J. Thomsons model represents the structure of an atom.
J.J. Thomson's experiments with cathode-ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged particles.
Colors of light with shorter wavelengths - A: have less energy than colors with longer wavelengths Strike Reset B: have more energy than colors with longer wavelengths Strike Reset C: have less matter than colors with longer wavelengths Strike Reset D: have more matter than colors with longer wavelengths Strike Reset
Answer is in the photo. I can't attach it here, but I uploaded it to a file hosting. link below! Good Luck!
tinyurl.com/wpazsebu
Which is true of the enthalpy of a reaction?
Answer:
C. Its Value Does Not Depend On Which Reactions Are Added
Explanation:
I Just took the test
The true statement of the enthalpy of a reaction is its value does not depend on which reaction is added. The correct option is C.
What is enthalpy?
Enthalpy is a term of thermodynamics. It is the total internal energy and product of the pressure and volume of a system. It can not be calculated, but can be changed.
Thus, the correct option is C, its value does not depend on which reaction is added.
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A plot of the Maxwell distribution of velocities for a number of different gases measured at the same temperature shows that
Answer:
as molecular mass increases, more molecules have speeds close to their average speed.
Explanation:
A plot of the Maxwell distribution of velocities for several different gases measured at the same temperature shows that "as molecular mass increases, more molecules have speeds close to their average speed."
This is evident in the fact that the Maxwell distribution of speeds for a given selection of gas at a given temperature shows certain traits if one of the main variables is changed, such as
1. Mass: The proportion of speeds for a given selection of gas is narrower and the average speed is lower for gas of higher molecular weight.
2. Temperature: The proportion of speeds for a given selection of gas is wider and the average speed is higher as the temperature of a gas increases.
A tower built of Iron is 500 meter tall. What is the change in height (m) if it is exposed to 25 0 Celsius during summer and at 1.00 Celsius during winter. α iron = 1.2 x 10-5/ Celsius
Answer:
-0.144 m
Explanation:
From the question,
α = Δh/(h₁Δt).................... Equation 1
Where α = coefficient of linear expansivity of iron, Δh = change in height, h₁ = initial height, Δt = change in temperature.
make Δh the subject of the equation
Δh = α(h₁Δt)..................... Equation 2
Given: α = 1.2×10⁻⁵/°C, h₁ = 500 m,
Δt = (t₂-t₁) Where t₂ and t₁ = Final and initial temperature respectively.
Δt = (1-25) = -24 °C
Substitute these values into equation 2
Δh = 1.2×10⁻⁵[500×(-24)]
Δh = 1.2×10⁻⁵(-12000)
Δh = -0.144 m
How does living in a group help wolves?
Answer: They can hunt together.
Explanation:
Answer:
Wolves are pack animals. They live together in small groups, or families.It's a howl of support, to let the pups know that the pack is there. The other pack members tip their heads back and add their voices to the call.
Explanation:
Rust forming on a piece of iron is an example of which of the following? *
1The natural process of decay as metallic ions age
2 A physical change because the process can be reversed
3 A chemical change because oxygen atoms from the atmosphere bonded with the iron atoms
4 A violation of the laws of physics because new mass has been created
Which set of elements has physical and chemical properties similar to phosphorus?
Aluminum, silicon, sulfur, & chlorine, , ,
Carbon, selenium, iodine, & radon
Oxygen, germanium, indium & mercury
Nitrogen, arsenic, antimony & bismuth
Nitrogen, arsenic, antimony & bismuth
Explanation:
Phosphorus belongs to the 15th group, that is nitrogen family.
Natures are decided by the number of valence electrons.
In a family, all elements have same outer electronic configuration or you say number of electrons.
General electronic con.: ns²np³
if a:b =2:3and b:c=6:10,find a:c.
Answer:
4:10
Explanation:
a:b
2:3
6:10
b:c
The common ratio is b
The lcm of 3 and 6 is 6.
Multiply the first ratio by 2 and the second one by 1
a:b:c
4:6:10
hence a:c = 4:10
Instructions:
Balance chemical equations on bach side by multiplying the molecular or ionic compounds by a
coefficient.
_C3_H8
+
O2
CO2
H2O
Answer: the answer is b
Explanation:
Answer:
Explanation:
B answer
An idea is being proposed. The steps that led to the idea are listed below:
There was a review by the scientific community.
The data collected was observable and measurable.
Opinion and values of all social groups were implemented.
Can this idea be scientific?
A. Yes, because the idea was tested empirically.
B. No, because opinions and social values may lead to bias.
C. Yes, because all steps of the scientific method were followed.
D. No, because the scientific community often favors its peers.
Answer:
No because opinion and social values may lead to bias
Explanation:
I'm smart >:)
B. No, because opinions and social values may lead to bias.
if it's wrong correct me but I'm pretty sure that's right!
i need this answer today help pls
Answer:
A. 28 days
Explanation:
Answer:
about 29.53 days
So, 28 days.
Explanation:
If you want the exact, It takes 27 days, 7 hours, and 43 minutes. Yes, i was bored so i calculated it. I'm good with astrology.
Where is most of an atom's atomic mass?
Answer:
The nucleus contains the majority of an atom's mass because protons and neutrons are much heavier than electrons, whereas electrons occupy almost all of an atom's volume. The diameter of an atom is on the order of 10−10 m, whereas the diameter of the nucleus is roughly 10−15 m—about 100,000 times smaller.
Explanation:
Answer: Nucleus.
Explanation:
Match the words and the definitions (15 points for you, please answer quickly <3)
Question 1 options:
Umbra
Eclipse
Penumbra
Corona
1.
The outer, larger, lighter shadow
2.
During a solar eclipse, the moon covers the sun, a small ring of fire is visible around the edge
3.
to vanish
4.
the inner, darkest, cone-shaped shadow is
Umbra is cone shaped, darkest, inner shadow, eclipse means to vanish, when moon covers sun during solar eclipse, ring of fire visible is called as corona, and larger, lighter shadow of outside is called penumbra. Thus, 1. D, 2. C. 3. B, 4. A are correct.
What is an eclipse?When any astronomical object is temporarily become unclear, because its light is blocked by another object bypassing it, during an astronomical event it is called as eclipse.
Umbra and penumbra re caused by solar eclipse. When light source is completely covered by light source, it is called umbra and when, partial illumination or partial shadow occur, it is called penumbra.
The ring of light visible around edges, during solar eclipse, it is called as corona. Therefore, option 1. D, 2. C. 3. B, 4. A are correct.
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In Mexico City, what are the two things that are causing most of the pollution? If you answer with an explanation I will give you Brainlist PLEASE HELP ITS DUE IN 30minutes
Which plate is the South American plate?
Web
D
O A D
B. A
C. B
В
D C
Answer:
C. B
Explanation:
The correct plate is showing n the green color that is of South America and is a major tectonic plate. The plate belongs to the south American continent and forms the southernmost part of the mid-Atlantic ridge. According to the plate movement, it's still moving to the west away from the Atlantic ridges due to the seafloor spreading. Has The plate has an approx area of 43,600,000 km square.does anybody know the answer to this?
Answer:
The answer is Conduction.
A wooden plank has a mass of 100kg force of 20 n was used to move it what is its acceleration
Answer:
a= 0.2m/s²
Explanation:
Fnet = ma
20 = 100a (divide both sides by 100)
a = 0.2m/s²
A wooden plank has a mass of 100 kg force of 20 Nwllhave the acceleration of 0.2 m/s².
What is Acceleration ?Acceleration is the rate of change of the velocity of an object with respect to time.
Accelerations are vector quantities.
The orientation of an object's acceleration is given by the orientation of the net force acting on that object.
We know,
F= ma ,
where
F is force , M is mass , A is acceleration.For 100kg ,
20 = 100 x A
A = 20/100
A = 0.2 m/s².
Therefore, A wooden plank has a mass of 100 kg force of 20 Nwllhave the acceleration of 0.2 m/s².
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Do elements in the same group have same principle number?
The s-, p-, and d-block elements of the periodic table are arranged into 18 numbered columns, or groups. The elements in each group have the same number of valence electrons. As a result, elements in the same group often display similar properties and reactivity.
Answer:
Yes
Explanation:
The atomic number never changes because the number of protons for na elecment never change and if they do, they trn into a neww element
What is the chemical equation of a covalent bond
Answer:
In my knowledge of chemistry, I believe there isn't chemical equation for covalent bond. There is only covalent formula
Explanation:
Calculate the energy of interaction between a lithium ion and a magnesium ion at a distance of 4.55x10^-10 m
definition of diameter?
Answer:
a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.
Explanation:
a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.
How has the atom changed since Rutherford’s Early Atomic Model?
Answer:
the atom has changed in many ways, we have found sizes, masses, electrons, neutrons, and more.
Explanation:
A solid has a fixed ___________________ and a fixed ____________
Answer:
Shape and volume
hope this helps
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Explanation:
Describe the periodic trend in the ionization energy of elements down a group. Use the periodic table, ionization energy and your knowledge of atomic radius as evidence.
Answer:
As we move down the group it increases.
Explanation:
This is because the electrons are farther away from the nucleus and hence they are not tightly bounded.
Help plsssssss... 3C(s) + 2Fe2O3 (5) ► Fe
(s)
+ 3CO2 (g)
What type of chemical reactions is the chemical reaction described above?
Answer:
single displacement
Explanation:
the Fe was switched out with the C. they are the only ones that switched, making it a single displacement
Answer:
Single displacement.
Explanation:
This is because Iron (Fe) was "switched" with C and this being the only "switch" in the equation makes it a single displacement.