Answer:
its c
Explanation:
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
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.
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.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
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
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.
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.
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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The decrease in the quality of water caused by the discharge of solid or liquid waste into it is called water pollution true or false?
Answer:
The answer to this is TRUE.
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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Calculate the following:)
Answer:
I think it's 1.55 x 10^40
Explanation:
i hope dis helps<3
A solid has a fixed ___________________ and a fixed ____________
Answer:
Shape and volume
hope this helps
have a good day :)
Explanation:
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
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
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
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
Is this statement true or false? A chemical reaction is balanced when the number of atoms of each element is the same for both the reactants and the products.
Answer: True
Explanation:
because
Answer:
True
Explanation:
I took the test
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.
Hope it helps plz mark brainlist :)
a student claims the change in average global air temperatures is a result of burning fossil fuels. Explain whether the students claim is plausible based on the data
Answer: When fossil fuels are burned, they release nitrogen oxides into the air and has a significant impact on global warming. Nitrogen oxide is 300 times more potent than carbon dioxide, and it also depletes the ozone layer.
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.
does anybody know the answer to this?
Answer:
The answer is Conduction.
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:
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 student thermally decomposed a .810 gram sample of impure potassium chlorate. Manganese dioxide was used as a catalyst in the reaction. The student collected 43.60 mL of oxygen gas over water in a eudiometer. Potassium chloride was the other product of the reaction. The temperature and pressure at collection time were 20 Celcius and 762.10 torr respectively. The water level in the eudiometer was 4.22 cm above the outside water level in the beaker. a) write a balanced equation for the reaction. b) what is the corrected pressure of the dry oxygen gas c) what is the volume in mL of the dry oxygen gas at STP conditions d) how many molecules of oxygen gas were collected e) what is the percent purity of the original potassium chlorate sample.
Answer:
a. 2 KClO3 ------> 2 KCl + 3 O2
b. Vapor pressure of dry oxygen gas = 741.45 torr
c. Volume at STP = 39.63 mL
d. Number of oxygen gas molecules = 1.065 × 10^21 molecules
e. Percent purity of KClO3 = 40.07 %
Explanation:
a) The balanced equation for the reaction is given below :
2 KClO3 ------> 2 KCl + 3 O2
b) Vapor pressure of dry oxygen gas = Total pressure - (water vapor pressure + pressure due difference in water levels)
Vapor pressure of water at 20 °C is 17.535 mm (torr).
Pressure due to difference in water level = 4.22 cm × 10mm/cm / 13.534 (13.534 is the density of mercury) = 3.118 mm (torr).
Vapor pressure of dry oxygen gas = 762.10 torr - 3.118 torr - 17.535 torr
Vapor pressure of dry oxygen gas = 741.45 torr
c) P1 = 741.45 torr
V1 = 43.60 ml
T1 = 20 °C + 273.15 = 293.15 K
P2 = 760 torr
T2 = 273.15 K
V2 = ?
Using the general gas equation = P1V1/T1 = P2V2/T2
V2 = P1V1T2 / P2T1
V2 = (741.45 × 43.60 × 273.15 ) / (760 × 293.15)
V2 = 39.63 ml
Volume at STP = 39.63 mL
d) 39.63 mL = 0.03963 L
Number of moles of oxygen gas in 0.03693 L = 0.03963/22.4 L
Number of molecules of oxygen gas = 0.03963/22.4 L × 6.03 × 10^23
Number of oxygen gas molecules = 1.065 × 10^21 molecules
e) Number of moles of O2 = 39.63/22.4 = 0.001769 mole
From the balanced equation, mole ratio between oxygen gas and potassium chlorate is 3 : 2
Moles KClO3 = 3/2 × 0.001769 moles = 0.00265 moles
Molar mass of KClO3 = 39 + 35.5 + 3 × 16 = 122.5 g
Actual mass of KClO3 decomposed = 122.5 grams × 0.00265 mole = 0.3246 grams
Percent purity = (actual mass KClO3 decomposed / sample mass of impure KClO3) × 100%
Percent purity = (0.3246/0.810) × 100% = 40.1 %
2KClO₃ ------> 2KCl + 3O₂
The corrected pressure of the dry oxygen gas will be calculated with this formula:Vapor pressure of dry oxygen gas = Total pressure - (water vapor pressure + pressure due difference in water levels)
Vapor pressure of water at 20 °C is 17.535mm(torr)
Pressure due to different water levels is
4.22 cm × 10mm/cm / 13.534 (13.534 is the density of mercury) = 3.118 mm (torr).
Vapor pressure of dry oxygen gas = 762.10 torr - 3.118 torr - 17.535 torr
= 741.45 torr
Volume of dry oxygen gasSince we have, P1 = 741.45 torr, V1 = 43.60 mL ,T1 = 20 °C + 273.15 = 293.15 K, P2 = 760 torr , T2 = 273.15 K , V2 = ?
We can then use the general gas equation = P1V1/T1 = P2V2/T2
V2 = P1V1T2 / P2T1
V2 = (741.45 × 43.60 × 273.15 ) / (760 × 293.15)
V2 = 39.63 mL
Volume of dry oxygen gas = 39.63 mL
Number of moles of oxygen gas that was collected will be 0.03693 L = 0.03963/22.4 LNumber of molecules of oxygen gas = 0.03963/22.4 L × 6.03 × 10^23
= 1.065 × 10^21 molecules
The percentage purity will be calculated using the number of moles of O₂ = 39.63/22.4 = 0.001769 moleWe use the balanced equation for the reaction to calculate mole ratio. The
mole ratio between oxygen gas and potassium chlorate is 3 : 2
Mole of KClO₃ = 3/2 × 0.001769 moles = 0.00265 moles
Molar mass of KClO₃ = 39 + 35.5 + 3 × 16 = 122.5 g
Actual mass of KClO₃ decomposed = 122.5 grams × 0.00265 mole = 0.3246 grams
Percentage purity = (actual mass KClO₃ decomposed / sample mass of impure KClO₃) × 100%
= (0.3246/0.810) × 100% = 40.1 %
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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!
An alternative form or version of a gene is a(n):
A allele
B karyotype.
C homologous chromosome.
D non-homan alternative form or version of a gene is a(n):
A allele
B karyotype.
C homologous chromosome.
D non-homologous chromosome.
Answer:
The answer is A.allele
Explanation:
An allele is a variant form of a gene. Some genes have a variety of different forms, which are located at the same position, or genetic locus, on a chromosome. Humans are called diploid organisms because they have two alleles at each genetic locus, with one allele inherited from each parent.
Did this on e d g e n u i t y!
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:
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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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.
Calculate the energy of interaction between a lithium ion and a magnesium ion at a distance of 4.55x10^-10 m