Below is the Lewis structure for methane.
HELPP!!
Based on its Lewis structure, what is the correct shape of a methane molecule?
A.
tetrahedral
B.
trigonal planar
C.
trigonal pyramidal
D.
bent
Answer:
C. trigonal pyramidal ..
What is the mass of 4 moles of fluorine (F) atoms?
The Periodic Table
O A. 2.41 x 1024 g
O B. 76.0 g
O C. 4.58 x 10259
O D. 19.09
Answer:
the mass of fluorine in 4 moles is going to be 76.0 g
Answer:
[tex]\boxed {\boxed {\sf B. \ 76.0 \ g }}[/tex]
Explanation:
We are asked to find the mass of 4 moles of fluorine atoms.
We will convert moles to grams using the molar mass. This is the mass of 1 mole of a substance. These values are found on the Periodic Table. They are equivalent to the atomic masses, but the units are grams per mole instead of atomic mass units.
Look up fluorine's molar mass.
F: 18.9984032 g/molWe will convert using dimensional analysis so we must set up a ratio.
[tex]\frac {18.9984032 \ g \ F}{ 1 \ mol \ F}[/tex]
We are converting 4 moles of fluorine atoms to grams, so we multiply this value.
[tex]4 \ mol \ F *\frac {18.9984032 \ g \ F}{ 1 \ mol \ F}[/tex]
The units of moles of fluorine cancel.
[tex]4 *\frac {18.9984032 \ g \ F}{ 1}[/tex]
A fraction with a denominator of 1 is equal to the numerator, so we can ignore the denominator.
[tex]4 *18.9984032 \ g \ F[/tex]
[tex]75.9936128 \ g \ F[/tex]
Let's round to the tenths place. The 9 in the hundredth place tells us to round the 9 in the tenths place to a 0, then the 5 in the ones place rounds to a 6.
[tex]76.0 \ g \ F[/tex]
4 moles of fluorine atoms are equal to 76.0 grams of fluorine and choice B is correct.
13. Find the total number of atoms present in the following molecules.
a. 5 H₂O
b. Zn Cl₂
Answer:
zxcdfzdg
Explanation:
zszghzd
I don’t know but I think it’s kinetic?
Answer:
heat
kinetic
sound
PLS MARK BRAINIEST!!!
Silicon has three naturally occurring isotopes (Si-28, Si-29, and Si-30). The atomic mass and natural abundance of Si-28 are 27.9769 amu and 92.2 %, respectively. The atomic mass and natural abundance of Si-29 are 28.9765 amu and 4.67 %, respectively. Find the natural abundance of Si-30. Express your answer numerically using two significant figures.
Answer:
3.1%
Explanation:
100% - 92.2% - 4.67% = 3.1% (2 s.f.)
calculate the volume of CO₂ at NTP occupied by 44.4g of heat
We know at NTP each gas has 22.4L of volume .
[tex]\boxed{\sf 1mol\:of\:CO_2=22.4L=44g}[/tex]
Hence 1g of CO2 contain
[tex]\\ \sf\longmapsto \dfrac{22.4}{44}[/tex]
[tex]\\ \sf\longmapsto 0.5L[/tex]
Now 44.4g of CO_2 has
[tex]\\ \sf\longmapsto 0.5\times 44.4=22.2L[/tex]
Please help me I’m desperate plz help and fast
Answer:c
Explanation:
Can someone do this for me!!????PLEASEEEE
Answer:
no that's worth points
Explanation:
HELP ME !!!!!!!!!!!!!!
Answer:
The substance is gloucuse based.
An atom that has lost electrons is a:
Answer:
The atom that has lost an electron becomes a positively charged ion (called a cation)
PLEASE MARK ME BRAINLIESTAnswer: it’s a cation
Explanation:
(WILL MARK BRAINLIEST)SOME1!! Trying to Turn this In! Please HELP ASAP! SOME1?
1. Which statement correctly describes the relationship between the volume of a gas and its temperature, in Kelvin, assuming pressure is held constant?(1 point)
The relationship is directly proportional; as temperature increases, volume decreases in the same way.
The relationship is inversely proportional; as temperature increases, volume increases in the same way.
The relationship is inversely proportional; as temperature increases, volume decreases in the same way.
The relationship is directly proportional; as temperature increases, volume increases in the same way.
2. Which statement explains the molecular changes that occur in an enclosed gas as the pressure increases and the temperature is held constant?(1 point)
An increase in pressure causes particles to move closer together, decreasing the volume.
An increase in pressure causes particles to move farther apart, decreasing the volume.
An increase in pressure causes particles to move closer together, increasing the volume.
An increase in pressure causes particles to move farther apart, increasing the volume.
3. The ideal gas law is represented by PV=nRT. As volume is held constant and the temperature increases, how would the pressure be expected to change?(1 point)
It would remain constant.
It would increase.
It would become zero.
It would decrease.
4. When the pressure of a gas decreases, which quantity will increase, assuming all other variables are held constant?(1 point)
V
R
T
n
5. Two balloons hold two different gases. The gases are held at the same pressure, volume, and temperature. Which quantity can differ between the two gases?(1 point)
the molar volume of each gas
the gas constant of each gas
the mass of each gas
the number of moles of each gas
Answers
1) the relationship is directly proportional, as temperature increases, volume increases In the same was.
2) an increase in pressure causes particles to move closer together, decreasing the volume.
3) it would increase
4)V.
5) the mass of each gas
1) The relationship between volume of a gas and its temperature, in Kelvin, assuming pressure is held constant is best shown by the statement; "The relationship is directly proportional, as temperature increases, volume increases in the same way."
2) The statement " an increase in pressure causes particles move closer together, decreasing the volume." explains the changes that occur when pressure is increased at constant temperature.
3) From the ideal gas law, the pressure increases as temperature increases
4) Following from Boyle's law; the volume decreases as the pressure increases.
5) The number of moles of each gas of each gas can be different.
Charles law states that; the volume of a given mass of gas is directly proportional to its temperature at constant pressure. This implies that, given a mass of gas, the temperature increases as the volume increases at constant temperature.
According to Boyle's law the volume of a given mass of gas is inversely proportional to its volume at constant temperature. This simply implies that as pressure increases as volume decreases(inverse proportionality and vice versa).
The pressure and temperature are directly proportional to each other when other variables are held constant.
From Avogadro's law, the volume of a given mass of gas is directly proportional to the number of moles( V α. n). Therefore, the number of moles of each gas of each gas can be different when the gases are held at the same pressure, volume, and temperature.
Learn more; https://brainly.com/question/24518540
Select the arrangement that orders the compounds by increasing boiling point based on predominant intermolecular force. Please choose the correct answer from the following choices, and then select the submit answer button. Answer choices N2 < CO2 < NH3 < HF
The arrangement that orders the compounds by increasing boiling point based on predominant intermolecular force is; N2 < CO2 < NH3 < HF
The molecules that compose a substance are held together by intermolecular forces. The physical properties of a substance such as boiling points depends on the nature of intermolecular forces between substances. The greater the magnitude of intermolecular interaction between bonding atoms the higher the boiling point.
Nitrogen and CO2 molecules are only held together by weak dispersion forces. However, CO2 has a higher boiling point than N2 because CO2 has a higher molecular mass than N2.
Nitrogen is less electronegative than fluorine hence the magnitude intermolecular interaction via hydrogen bonding in HF is greater than that in NH3 consequently, the boiling point of HF is higher than that of NH3.
Learn more; https://brainly.com/question/9007693
How do robots help scientists to perform experiments?
A.Robots go places humans are unable to go.
B.Robots are smarter than humans.
C.Robots increase the risk of an experiment.
D.Robots slow down data acquisition.
Answer:
A. Robots go places humans are unable to go.
Think of the arrangement of an atom and how different elements behave when exposed to heat. How do fireworks operate? What is moving within the atom? In your response make sure that you use the terms: ground state, excited state, photon, wavelength, energy, emission spectra and orbital.
Explanation:
How Fireworks operate
Fireworks contain an explosive powder, along with a binding paste, mixed with the signature chemicals responsible for its bright colors. ... The wavelength, and so the color of the light emitted, is fixed by these energy differences, giving each substance a "fingerprint" line emission spectrum. When the fireworks explode, electrons within the atoms of these different elements absorb energy and get “excited” which causes them to move into the higher energy orbits. When they come down to lower energy orbits, photons are released which allow us to see the great colors during a fireworks show. The electrons of the aluminum atoms absorb heat energy and become excited. The excited energy level the of electrons are energy level 2 or n=2 and above. ... Then electrons of lose the energy and fall back down to ground state which at energy level .This is also how a firework works on an atomic level.
Hope it helps :)
Please help me please
Explanation:
1 sugar solution =Distillation
2 Iron powder and sand=magnetic separation
3 petrol and diesel= Fractional distillation
4 Camphor and glass powder = Sublimation
Pure substances can be elements or compounds. An element is a form of matter that cannot be broken down by chemical reactions into simpler substances. A compound is a substance composed of two or more different types of elements ,chemically combined in a fixed ratio. 2.(a) Elements and compounds are called as pure substances because it is made up of _________________ *
a.same kind of atoms or molecules
b. different kinds of atoms or molecules
c.heterogeneous mixtures
d.solutions
Answer:
a.same kind of atoms or molecules
What is Equilibrium? I’m a little confused on the topic. You’ll get a lot of points if you answer I think.
Answer:
to put it simply, equilibrium is when two opposing forces balance each other out. one example is boats: you know how the bottom half is curved, and then meets at an edge? they design it like that because of water displacement. by gravity, the water wants to go back to the area taken by the boats mass (the parts where it has sunken into the water), thus preventing the boat from sinking. once the boat is removed, the water returns to the space. most liquids take form of their container.
Consider a cloudless day on which the sun shines down across the United States. If 2559 kJ of energy reaches a square meter (m2) of the United States in one hour, how much total solar energy reaches the entire United States per hour? The entire area of the United States is 9,158,960 km2 .
In 1 hour, 2.344 × 10¹⁶ kJ of solar energy reaches the United States.
The entire area of the United States is 9,158,960 km². We will convert it to m² using the conversion factor 1 km = 10³ m, squared.
[tex]9,158,960 km^{2} \times (\frac{10^{3} m }{1km} )^{2} = 9.158960 \times 10^{12}\ m^{2}[/tex]
In order to find the amount of solar energy that reaches 9.158960 × 10¹² m² we will use another conversion factor: 2559 kJ of energy reaches a square meter of the United States in one hour.
[tex]9.158960 \times 10^{12}\ m^{2} \times \frac{2559 kJ}{m^{2}.h } = 2.344 \times 10^{16} kJ/h[/tex]
In 1 hour, 2.344 × 10¹⁶ kJ of solar energy reaches the United States.
You can learn more about unit conversions here: https://brainly.com/question/19420601
help please !
33. When a hypothesis is not correct a good researcher would rewrite the hypothesis and then re- test it.
True
False
34. A successful experiment is one that can be analyzed and explained, even if the answer is not what the researcher expected.
True
False
35. A successful experiment often leads to more questions.
True
False
Answer:
false
true
true
Explanation:
false - changing the hypothesis to meet your needs is not a good researcher
true - when you can further analyze and explain then you have a successful experiment even if it's not what you expected
true - successful experiments do not end there. they can lead to more in depth questions.
Choose all of the answers that are correct when describing this atom.
This is Chlorine
This is bromine
The mass of this is atom is 35 amu.
This atom has an overall charge of 0
The mass of this atom is 69 amu
To solve this question, it is important look at the pictue of the atom. The atom has the following properties:
17 protons17 electrons18 neutronsNow, let's judge each affirmation
This is Chlorine --> CorrectTo indentify what element is this atom, we should know what is its atomic number. The atomic number is equal to the number of protons in the atom. In our atom, we have 17 prontos, so, the atomic number is 17.
In the Periodic Table, the atomic number is above of letter that represents the elements. For example, the atomic number of the Helium (H) is 1.
Now, let's look to the Periodic Table and find the element of the atomic number is 17. The element that the atomic number is 17 is Chlorine. So, this affirmation is true.
This is Bromine --> IncorrectWe saw before that is a atom of Chlorine, because its atomic number is 17. The atomic number of Bromine (Br) is 35.
The mass of this atom is 35 amu --> CorrectThe mass of any atom is equal the sum of the number of protons and the number of neutrons. This happens because the mass of the electrons is negligible. So, let's calculate the mass of our atom:
[tex]mass = protons + neutrons\\mass = 17 + 18\\mass = 35[/tex]
Therefore, the mass of this atom is 35 amu, so the affirmation is correct.
This atom has an overall charge of 0 --> CorrectAny atom has a overall charge different of 0 if the number of protons and electrons are different.
In our case, the number of protons and alectrons are equals, so the overall charge is 0. So, the affirmation is correct.
The mass of this atom is 69 amu --> IncorrectWe saw before (third affirmation) that the mass of this atom is 35 amu. So, this is a incorrect affirmation.
I hope I've helped. ^^
Enjoy your studies! \o/
a rabbit has a mass of 2 kg. what is the weight?
On average an adults lung volume is 5 L convert to mL
[tex]\\ \sf\longmapsto 5L[/tex]
[tex]\\ \sf\longmapsto 5(1000)[/tex]
[tex]\\ \sf\longmapsto 5000mL[/tex]
tetrachloromethane and water can be seperated using a seperating funnel . what can be reduced from this statement
Answer: Hello There!................
Separating funnuel. AND
Explanation:
Carbon tetrachloride and water are separated by using a separating funnel. Carbon tetrachloride and water are imiscible with each other. Hence, they form two layers. The density of carbon tetrachloride is more dense than water and forms lower layer. Water being less dense, forms upper layer.
Mark me brainest please. Hope this helps. Anna ♥
Gold can be hammered into decorative gold leaf, which is only 1.00E-07m thick. If 1.35 troy ounce of gold is hammered into gold leaf, what is the area that can be covered when used for decoration? 1 troy ounce = 31.1g, and the density of gold is 19.3 g/cm^3
The area that can be covered when used for decoration is 21.8 m².
To solve this question, we'll by converting 1.35 troy ounce to grams (g). This can be obtained as as illustrated below:
1 troy ounce = 31.1g
Therefore,
1.35 troy ounce = 1.35 x 31.1
1.35 troy ounce = 41.985 gThus, 1.35 troy ounce is equivalent to 41.985 g.
Next, we shall determine the volume of the gold leaf. This can be obtained as follow:
Mass = 41.985 g.
Density = 19.3 g/cm³
Volume =?[tex]Density = \frac{mass}{volume } \\\\19.3 = \frac{41.985}{Volume }[/tex]
Cross multiply
19.3 × Volume = 41.985
Divide both side by 19.3
[tex]Volume = \frac{41.985}{19.3}[/tex]Volume = 2.18 cm³Next, we shall convert 2.18 cm³ to m³.
1 cm³ = 1×10¯⁶ m³
Therefore,
2.18 cm³ = 2.18 × 1×10¯⁶ m³
2.18 cm³ = 2.18×10¯⁶ m³Thus, 2.18 cm³ is equivalent to 2.18×10¯⁶ m³.
Finally, we shall determine the area. This can be obtained as follow:
Volume = 2.18×10¯⁶ m³
Thickness = 1×10¯⁷ m
Area =?
Volume = Area × Thickness
2.18×10¯⁶ = Area × 1×10¯⁷
Divide both side by 1×10¯⁷
[tex]Area = \frac{2.18*10^{-6} }{1*10^{-7} }\\\\[/tex]Area = 21.8 m²Therefore, the area that can be covered when used for decoration is 21.8 m²
Learn more: https://brainly.com/question/24485916
Answer
Choice A
Answer
Choice B
Answer
Choice C
Question
A scientist hypothesizes that a new medication can reduce
the chances of catching a cold Which of these would most
likely be the dependent variable in a study involving this
medication?
//
The participants
who do not receive
the medication
Color PURPLE
The number of
participants who
catch a cold
Color YELLOW
The age of the
participants
Color GRAY
Tt remains the
T+ is purposely
It is used for
Answer:
what is the question????
Please help me please find the answer
Please find attached photograph for your answer. Hope it helps! Please do comment
9.Out of the following which is a poly atomic molecule. (H2, CI 2.03.)
the poly atomic molecule is H2
c. Who is faster, the runner who runs a mile in 8 minutes or the runner who runs a
kilometer in 4 minutes?
Answer:
the runs a mile in 8 minutes is faster
3. Which of the following quantities is a density? (hint check your units!)
a. 9 cal/g
b. 100 cm/m
c. 1.5 gL
d. 454 g/lb
if c is 1.5 g/L
gram/ liter
then its a density unit
then its a density quantity
Pioneer 10 is a 267.1-kilogram robotic space probe that completed the first interplanetary mission
to Jupiter, and became the first spacecraft to achieve escape velocity from our solar system. How
much does it weight in pounds (lbs)?
Answer: 588.9 lbs
Explanation: 1 lb = 0.454 kg
(267.1kg)*(1 lb/0.454 kg) = 588.9 lbs
