Answer:
The answer is 18
Explanation:
Other atoms of chlorine may have 20 neutrons in the nucleus. These atoms of chlorine have different atomic mass numbers. The isotope that has 18 neutrons has an atomic mass number of 35.
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.
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Please answer all questions as completely as possible showing all work needed. Also don’t forget to include your units
density = mass / volume
d = m / V
2) Calculate the density of a material that has a mass of 52.457 g and a volume of 13.5 cm3.
3) A student finds a rock on the way to school. In the laboratory he determines that the volume of the rock is 22.7 mL, and the mass in 39.943 g. What is the density of the rock?
4) The density of silver is 10.49 g/cm3. If a sample of pure silver has a volume of 12.993 cm3, what is the mass?
5) What is the mass of a 350 cm3 sample of pure silicon with a density of 2.336 g/cm3?
6) Pure gold has a density of 19.32 g/cm3. What volume would a piece of gold have if it has a mass of 318.97 g?
7) The density of lead is 11.342 g/mL. What would be the volume of a 200.0 g sample of this metal?
8) The mass of a toy spoon is 7.5 grams, and its volume is 3.2 mL. What is the density of the toy spoon?
9) A 28.5 g of iron shot is added to a graduated cylinder containing 45.50 mL of water. The water level rises to the 49.10 mL mark, from this information, calculate the density of iron.
10) A rectangular block of copper metal weighs 1896 g. The dimensions of the block are 8.4 cm by 5.5 cm by 4.6 cm. From this data, what is the density of copper? (Hint: V = l x w x h)
pray for my test on monday❤️
Help! please i'm kinda stuck in here and i know it's really easy but i literally forgot
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 ..
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
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 ♥
1. Distinguish between a mixture and a pure substance.
Answer:
1)Mixture is the combination of substance
2)There are two types of mixture such as heterogeneous mixture and homogeneous mixture
3)foreg=Salt solution ,sedimentation
Pure substance
1)Pure substances are also called elements
2)They are made up of small atoms
3)for eg= oxygen,Venadium ,Iron,Oxygen
what is E1 reaction
Answer:
An elimination reaction is a type of organic reaction in which two substituents are removed from a molecule in either a one- or two-step mechanism. The one-step mechanism is known as the E2 reaction, and the two-step mechanism is known as the E1 reaction0
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.
It's okay to have more than one independent variable in an experiment.
O True
O False
Answer:
False
Explanation:
In the laboratory, open-toed shoes and shorts:
a. Are potentially dangerous and should not be worn.
b. Are OK if the weather is hot.
c. Are all right if you are wearing a lab coat
d. Are OK if they are in style.
Answer:
a. Are potentially dangerous and should not be worn.
9.Out of the following which is a poly atomic molecule. (H2, CI 2.03.)
the poly atomic molecule is H2
Is baking soda a element, compound or a mixture?
Answer:
Baking soda (sodium bicarbonate) is scientifically is a compound. It consists of different types of atoms (Sodium, Hydrogen, Carbon, and Oxygen) which chemically combine.
I don’t know but I think it’s kinetic?
Answer:
heat
kinetic
sound
PLS MARK BRAINIEST!!!
a rabbit has a mass of 2 kg. what is the weight?
formation of curd from milk is a chemical change
Answer:
yeah it's a chemical change because..Curd or Dahi is a fermented milk product formed by fermentation of milk by Lactic Acid bacteria to Lactic acid. Milk consists of globular proteins called casein. The curd forms because of the chemical reaction between the lactic acid bacteria and casein. ... The byproduct of ATP production is lactic acid.hope it helps..stay safe healthy and happy..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.)
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.
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
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
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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 :)
List the steps of the scientific method
Easy points, just don't be annoying.
Answer:
•1. Make an Observation
•2. Ask a question about ____
•3. Make a hypothesis (educated guess)
•4. Make a hypothesis-based prediction
•5. Test your hypothesis
•6. Graph the results and Iterate.
Answer:
The steps of the scientific method are:-
●Report the Results.
●Ask a Question.
●Test the prediction.
●Make an observation.
●Form a hypothesis, or testable explanation.
●Make a prediction based on the hypothesis.
How do you write a balanced chemical equation for the reaction of sulfuric acid with magnesium nitrate to form magnesium sulfate and nitric acid
HELP ME !!!!!!!!!!!!!!
Answer:
The substance is gloucuse based.
Which Rocky planet's Biosphere is most different from Earth
Answer:
i guess it a right answer for you ✌
Mercury and venus are the two rocky planets that have the atmosphere most, unlike the Earth.
What are rocky planets?The planets Mercury, Venus, Earth, and Mars, are called terrestrial planets or rocky planets. This is because they have a compact, rocky surface like the Earth's. It's called terra firma.
The terrestrial planets are the four innermost planets in the solar system. These are also called inner planets. The terrestrial planets do not have rings. Earth has belts of trapped radiation.
Among the terrestrial planets, only Earth has a planetary magnetic field that is substantiated. The moons of Mars and the Earth have regional magnetic fields that are localized at various places around their surfaces but they have no global field.
Out of the terrestrial planets, only Venus, Earth, and Mars have significant atmospheres. The atmosphere of mercury is more or less like a vacuum. The gases that are present in a planetary atmosphere are related to the size, mass, temperature, of a planet and the formation of the planet, and about the presence of life.
Therefore, mercury and venus are the two rocky planets that have the atmosphere most, unlike the Earth.
Read more about rocky planets, here
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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]
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.
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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]
13. Find the total number of atoms present in the following molecules.
a. 5 H₂O
b. Zn Cl₂
Answer:
zxcdfzdg
Explanation:
zszghzd
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:
