Answers
Answer:
water
Explanation:
water is made up of both hydrogen and oxygen (h2o)
Related Questions
How many atoms are in 123 g of calcium
Answers
Answer:
Molar mass of Ca = 40 g / mol , given 123 g Ca is 123/40= 3.075 moles,
1 mole = 6.022 * 10^23 atoms, so 3.075 moles Ca= 18.51*10^23 atoms
Explanation:
The number of atoms present in 123 g of calcium is 18.51 x 10²³ atoms.
What is calcium?Calcium is an element present in the periodic table. It is very much needed for the strength of the bones and teeth.
"Molar mass of many compounds can be calculated by dividing the mass of the compound by the number of moles of the compound."
"The mole is a SI unit of measurement that is used to calculate the quantity of any substance".
First, calculate the moles
Moles = mass / molar mass
Molar mass of Ca = 40 g / mol
Given 123 g Ca is mass
123 / 40 = 3.075 moles,
1 mole = 6.022 x 10²³ atoms,
6.022 x 10²³ is the Avogadro number. It equals to one mole.
So 3.075 moles Ca= 18.51 x 10²³ atoms.
Thus, the number of atoms present in 123 g of calcium is 18.51 x 10²³ atoms.
To learn more about atoms, refer to the below link:
https://brainly.com/question/11763544
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QUICKLY!!!!!
1) Define the term energy.
•force applied to an object
•energy that is part of electromagnetic radiation
•stored energy
•the ability to do work
Answers
Answer:
The ability to do work is energy.
Hope it helps!!!
(1) Solution A and B are separated by a membrane that is permeable to Mg2 and impermeable to Cl-. Solution A contains 0.1 mM MgCl2, solution B contains 100 mM MgCl2. Mg2 will be at electrochemical equilibrium when solution A is around ____________ mV. 180 mV - 180 mV 90 mV - 90 mV 60 mV - 60 mV
Answers
Answer:
90 mV
Explanation:
Faraday constant, F = 96487
Gas constant, R = 8.314
Number of mole of electron transferred, Z = 2
MgCl in solution A, = 0.1 mm
MgCl in solution A, = 100 mm
Using the relation :
E=(RT/ZF) In(Mg out/Mgin)
E = (8.314*298) / (2*96485) * In(100/0.1)
E = (2477.572 / 192970) * 6.9077552
E = 0.0128391 * 6.9077552
E = 0.0886897 V
E = 88.68 mV (approximately 90 mV)
WHOEVER ANSWERS GETS BRAINLIEST!! (im not lying its facts)
A student placed four drops of water on a fresh slice of bread. Next the wet bread was placed inside a plastic bag and sealed up tight. After that, the student placed the sealed bag of wet bread on a balance. The mass is recorded as 20 grams. After 10 days, the student observed many types of mold growing on the bread and inside the sealed bag. The pictures show the student’s experiment.
Set up: A bread plus four drops of water plus a plastic bag equals to 20 grams.
Result: Bread in side the plastic bag equals to: ____ grams.
Predict the mass of the sealed bag of moldy bread.
A. 15 grams
B. 20 grams
C. 22 grams
D. 25 grams
Answers
Answer:
The answer to your question is D. 25 grams.
Answer
22 grams hope this helps
Help pls!!!!!!!!!!!!!
Answers
Answer:
3rd
Explanation:
Question 1 (1 point)
Stars come in different
a:colors
b:sizes
c:temperatures
d:all of the above
PLESE HELP ANYONE HURRY!
Answers
Answer:
All of above.
Explanation:
Stars. They come in different sizes, temperatures, and colors. Not all are yellow, and not all are small or big. Some can be hot, and others can be cold. Stars can exist for a while, years on end. It just varies on how long it's been there.
I hope this helps you!
During a chemistry lab exercise, a student isolates a compound at STP. In her
lab report, she has identified it as an ionic compound. If it is an ionic compound, it
will likely have a _________boiling point and be a _______ at STP.
Choose the answer with the words in the correct order that complete the
passage.
A. high; liquid
B. low; gas
C. high; solid
D. low; solid
please answer asap thank you !! :)
Answers
Ionic compounds have a high boiling point and be a solid at STP.
What is ionic compound?Ionic compounds are those compounds which are formed due to high electrostatic attraction between cations and anions.
Ionic compounds are generally present in the solid state because of the presence of strong ionic bond. And due to this rigid structure boiling point of ionic compounds are very high as they want more energy to break their bonds.
Therefor, at standard temperature pressure (STP) ionic compounds will likely have a high boiling point and be a solid at STP.
To learn more about ionic compounds, visit below link:
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The total age of 5 children aged 3 years is 50 years. Find the age of the youngest and oldest child?
Answers
Answer: See explanation
Explanation:
Here's the correct question:
The total ages of 5 children born at the intervals of 3 years each is 50 years. Find the age of the youngest and the oldest child.
From the information given, we can then make the following assumption with regards to their ages.
First child = y
Second child = y + 3.
Third child = y + 6
Fourth child = y + 9
Fifth child = y + 12
Therefore, y + y+3 + y+6 + y+9 + y+12 = 50
5y + 30 = 50
5y = 50 - 30
5y = 20
y = 20/5
y = 4
Youngest child = 4 years
Oldest child = y + 12 = 4 + 12 = 16 years
What is the mass in grams of 0.7350 moles of sodium?
Answers
Answer:
Explanation:
1 mol of sodium = 23 grams (use the number on your periodic table).
0.7350 mol sodium = x
Cross multiply
1*x = 0.7350 * 23
x = 16.905
You will get slightly less than this, depending on your periodic table. But the method will be the same.
Many popular brands of toothpaste contain about 1.00 mg of fluoride per gram of toothpaste. The fluoride compound that is most often used in toothpaste is sodium fluoride, NaF, which is 45% fluoride by mass. How many milligrams of NaF are in a 250.0 g tube of toothpaste
Answers
Answer:
Mass of NaF in 250 g tube of toothpaste = 100 mg of NaF
Explanation:
Mass of fluoride per gram of toothpaste = 1 mg
From the given data, the fluoride compound that is most often used in toothpaste is sodium fluoride, NaF, which is 45% fluoride by mass, mass of sodium fluoride per gram of toothpaste can be determined as follows:
1 mg of fluoride per gram of toothpaste = 45% total mass of NaF per gram of toothpaste
100% mass of NaF in toothpaste = 100/45 * 1 mg = 2.22 mg of NaF.
Therefore, mass of NaF per gram of toothpaste is 2.22 mg.
The mass of NaF in 250 g of toothpaste is then calculated below:
In 250 g of toothpaste, mass of NaF = 250 * 2.22 mg = 99.9 mg of NaF
Why is one side of the moon called "the dark side of the moon"?
Answers
Answer:
Option C
Explanation:
The answer is option C or "The amount of time it takes to rotate around it's axis is the same amount of time it takes to revolve around Earth."Remember that the Earth and the Moons amount of time to make a full rotation is almost in sync and they're two sides of the moon, one side we do not see and that's because that side is currently faced away from the Earth which is called the dark side of the moon. Each side has two weeks oh night, and two weeks of day because of how long it takes the moon to revolve, so while we have a side towards the Earth which is illuminated by the sun we have another pointing away in the dark.
Hope this helps.
For the reaction between aqueous calcium nitrate and aqueous sodium hydroxide producing the precipitate (solid) calcium hydroxide and aqueous sodium nitrate
(a) write a balanced equation for this reaction
(b) classify the reaction
Answers
Answer: Ca(NO3)2(aq) + 2NaOH(aq) —> Ca(OH)2(s) + 2NaNO3(aq)
Substitution
Explanation:
The given reaction is a substitution reaction in which hydroxil group is exchanged between compounds.
Substitution Reaction:
It is a reaction in which functional group of a compound replaced by the another functional group.
For example-
[tex]\bold {Ca(NO3)_2(aq) + 2NaOH(aq) \rightarrow Ca(OH)_2(s) + 2NaNO_3(aq)}[/tex]
In the reaction hydroxil group is exchanged between compounds.
1 mole of aqueous calcium nitrate react with 2 moles aqueous sodium hydroxide to produce 1 mole of solid precipitate calcium hydroxide and 2 moles aqueous sodium nitrate.
Therefore, the given reaction is a substitution reaction in which hydroxil group is exchanged between compounds.
To know more about Substitution Reaction,
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Based on the type or types of intermolecular forces, predict the substance in each pair that has the higher boiling point Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer Reset Help stronger dispersion forcesG Given the molecules propane (C3Hs) and n-butane (C4H10), Г- has the higher boiling point mainly due to n-butane (C,H Given the molecules diethyl ether (CH3 CH2OCH2 CHs) and 1-butanol (CH3 CH2CH2 CH2OH) higher boiling point mainly due to 1-butanel CH,CH, CH,CH,OH) diethyl ether (CH CH,OCH CH, has the propane (C, H ts greater melar mass
Answers
Answer:
C4H10 has a higher boiling point due to stronger dispersion forces
1-butanol has the greater boiling point mainly due to hydrogen bonding influences
Explanation:
If we consider propane and n-butane, we discover that they are both alkanes. However, the magnitude of dispersion forces in alkanes depends on the length of the carbon chain. The greater the length of the carbon chain is greater in n-butane than in propane. The greater the chain length, the greater the magnitude of dispersion forces and the greater the boiling point. Hence, n-butane has a higher boiling point than than propane.
Also, if we compare the boiling points of 1-butanol to that of diethyl ether, we will discover that 1-butanol has a higher boiling point mainly due to intermolecular hydrogen bonding influences.
Accreditation of laboratories that do forensic investigations is:_________
a. always required
b. done voluntarily
c. done using independent nongovernmental agencies such as ASTM and ISO
d. done by a special government agency to insure uniformity of testing and results across all laboratories is never done since this
e. is expensive and does not improve the results obtained by the laboratory
Answers
Answer:
a. always required
Explanation:
Accreditation of laboratories is a mandatory requirement for forensic science providers. To manage the quality of services provided by the forensic laboratories, Accreditation, Certification, and Interagency Working Group have found it necessary to make the accreditation of forensic laboratories mandatory.
This will instill confidence in the public and ensure that the services rendered by them are always accurate and up to standard.
1. A gas has a volume of 5.30 mL and a mass of 24.10 grams. What is the
density?
Answers
Answer:
4.5472g/ml rounded of to 4 s.f
Explanation:
Density= Mass/ Volume
(ILL GIVE 100 POINTS AND EDIT IT AND MARK BRAINLIEST) Examine the diagram of the cell cycle. Which label identifies the stage in which the DNA is copied and the cell grows? W X Y Z
Answers
Answer:
where is diagram. sorry.
For the reaction between zinc metal and hydrochloric acid (aqueous) producing zinc chloride (aqueous) and hydrogen gas
write a balanced equation for this reaction
classify the reaction
Answers
Answer: Zn + 2HCl —> ZnCl2 + H2 redox
Explanation:
H+ reduced to H
Zn oxidised to Zn++
What is the name of the process happening in the picture? How do you know it’s that process? Explain your answer in 2 to 3 sentences complete help please
Answers
Answer:
The name of the process happening in the picture is explained below in details.
Explanation:
The process in the picture is photosynthesis. The plant is taking CO2 and H2O and using light to form glucose which would be the sugars and creating a byproduct of oxygen that is being released into the atmosphere. How did you know this is photosynthesis? A big thing clearly is the plant and how it’s taking H2O and CO2 and making glucose so it isn’t cellular respiration (if you don’t know what that is don’t worry, if you are learning about this you are bound to come across that later) and it’s releasing oxygen into the atmosphere and light has a function in this process according to the image.
PLEASE HELP ASAP! GIVING OUT BRAINLIEST PLEASE PLEASE HELP
Name a mixtures of at least 3 items each and how you would separate them. Explain why each of the step would work. Do not use any of the items mentioned in the previous question. (which is salt, sand, water, and iron)
Answers
Answer:
That means we do not need to use chemical reactions to separate them. ... The one liquid component in milk is water, and the other is fatty oil. ... Identify the type of substances (solid, liquid or gas) that are mixed in each
Explanation:
Answer:
[tex] \huge \sf \colorbox{pink}{hey \: there}[/tex]
Explanation:
The mixture of clay or sand with water is muddy. The small clay particles become suspended in the water. This kind of mixture is called a suspension. Suspensions are opaque; that means they are cloudy and we cannot see through them very well.
Some students use an apple to represent the Earth. What is the best reason to use an apple for this comparison?
a. The skin of an apple is very thin, and the crust of the Earth very thin.
b. The flesh of an apple is made of the same material all the way through, and the interior of the Earth is the same all the way through.
c. The seeds of the apple are very light in comparison to the rest of the apple, and the core of the Earth is also made of very light matter.
d. The stem of the apple comes from the core and the North Pole comes from the Earth’s core.
Answers
222 g of MTBE (CO(CH3)4) are added to gasoline, resulting in a total volume of 2 L of reformulated gas (RFG). Assume that the density of RFG is 0.70 g/mL, and the density of MTBE is 0.74 g/mL. For a-d, determine the concentration of MTBE in the RFG in the following units?
a. mg/L
b. moles/L
c. % (w/w)
d. % (v/v)
e. What is the % (w/w) oxygen in the RFG due to MTBE?
Answers
Answer:
Explanation:
From the information given:
(a)
[tex]Concentration \ in \ mg/L = \dfrac{Mass \ of \ MTBE \ in \ mg}{Total \ volume (in \ L)}[/tex]
[tex]Concentration \ in \ mg/L = \dfrac{222 \times 10^3 \ mg}{22}[/tex]
[tex]Concentration \ in \ mg/L = 111 \times 10^3 \ mg/L[/tex]
(b)
[tex]number \ of \ mole s= \dfrac{mass}{molar \ mass } \\ \\ number \ of \ mole s=\dfrac{222 \ g}{88.15 \ g/mol} \\ \\ \mathbf{= 2.518 mol}[/tex]
(c)
[tex]w/w \ percentage = \dfrac{mass \ of \ MTBE }{mass \ of \ solution (RFG)}\times 100\%[/tex]
[tex]where; \\ \\ mass \ of \ (RFG) = 2L \times 0.70 g/mL \\ \\ mass \ of \ (RFG) = 2000 ml \times 0.70 g/mL \\ \\ mass \ of \ (RFG) = 1400 g[/tex]
∴
[tex]w/w \ percentage = \dfrac{222 \ g}{1400 \ g}\times 100\% = \mathbf{15.8\%}[/tex]
(d)
[tex]Volume of MTBE =\dfrac{mass \ of \ MTBE}{density \ of \ MTBE}[/tex]
[tex]Volume \ of \ MTBE = 300 \ mL\\[/tex]
∴
[tex]v/v\% = \dfrac{volume \ of \ MTBE}{volume \ of \ RFG} \\ \\ v/v\% =\dfrac{300 \ mL}{2000 \ mL}\times 100\% \\ \\ \mathbf{v/v\% = 15.00\%}[/tex]
(e)
[tex]From \the \ given \ information; \\ \\ 2.5184 \ moles\ of \ MTBE contain \ 2.5184 \ mole of oxygen[/tex]
∴
[tex]mass of oxygen MTBE = 2.5284 mol \times 16\ g/mol \\ \\ mass of oxygen MTBE = 40.3 9 \ g\\ \\ mass\ of \ RFG = 1400 g[/tex]
∴
[tex]\% w/w = \dfrac{mass \ of \ oxygen}{mass \ of RFG }=\dfrac{40.22 \ g}{1400 \ g} \times 100\%[/tex]
[tex]\% w/w == 2.88\%[/tex]
Assume That The Density Of RFG Is 0.7 G/mL And The Density Of MTBE Is ... are added to gasoline, resulting in a total volume of 2 L of reformulated gas (RFG). ... Assume that the density of RFG is 0.7 g/mL and the density of MTBE is 0.74 g/mL. Determine the concentration of MTBE in the RFG in the following units (a-d)
Help me please (btw I live in the U.S)
Answers
Answer:
I live in the USA so the questions have been answered to reflect that accordingly.
1. The letter which represents summer where I live is Letter C
Explanation:
Letter C represents the June solstice which usually takes place between June 20 and June 21.
2. The letter which represents winter where I live is letter A.
Explanation:
Letter A represents the December solstice. Another name for this is Winter Solstice. This usually takes place in December for those living in the Northern Hemisphere like me. It is projected that this will take place on Tuesday, 21 December 2021.
Another name for this is Northern Hemisphere Winter Solstice as it marks the first day of winter.
3. The correct seasons for June Solstice are:
Northern Hemisphere: Summer Solstice
This projected to occur on Sunday, 20 of June 2020. It will be characterized by 1 hour of twilight and approximately 10 hours each of daylight and night time.
4. Southern Hemisphere: Summer solstice
This is anticipated on Tuesday, 21 December 2021. It will also be characterized by 1 hour of twilight and approximately 10 hours each of daylight and night time.
5. Northern Hemisphere: Autumnal (Fall) Equinox
6. Southern Hemisphere: Spring (Vernal) equinox
7. December Solstice - Northern Hemisphere: Winter Solstice is the Day of the Year with the shortest amount of sunlight
8. December Solstice - Southern Hemisphere: Summer Solstice. This is the day of the year with the longest amount of sunlight
9. March Equinox - Northern Hemisphere: Spring (Vernal) Equinox. This is the start of spring.
10. March Equinox - Southern Hemisphere: Autumnal (Fall) Equinox. This is the start of Fall.
Cheers!
How many moles of O2 are needed to produce 2.5 moles of water?
Answers
Answer:
Mass of oxygen = 16 * 1.25 = 20 g
Explanation:
In the picture below, ammonia and bleach are mixed together. How many nitrogen (N) atoms will be in the products?
Answers
1
ammonia: NH3 (one nitrogen)
bleach: NaOCl (zero nitrogen)
What 2 things are produced by photosynthesis? Answer please
Answers
Answer:
Oxygen and glucose
Explanation:
Plants use the sun, water, and CO2 to make their own energy. Glucose is the result, and Oxygen is just a biproduct.
QUESTION NO.1
Anything that causes damage to the ______ and makes the _______ contaminated is called air polluton.
OPTIONS:
a) atmosphere
b) toilet
c) school
QUESTION NO.2
What are the causes of Acid Rain?
ANS:_____________________________________
Answers
Answer:
answer 1) Atmosphereanswer 2) Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.MARK ME AS BRAINLIST1 ans is atmosphere
2 ans is Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it has elevated levels of hydrogen ions. It can have harmful effects on plants, aquatic animals, and infrastructure.
plz help as soon as you can
Oil of Vitriol is a substance that humankind has used for thousands of years! Today the substance is known by its scientific name sulfuric acid and has the molecular formula H2SO4. What is the molar mass of H2SO4?
Question 2 options:
49.067 g/mol
73.29 g/mol
98.08 g/mol
148.72 g/mol
Answers
Answer:
98.08 g/mol
Explanation:
Hope this helps.
What does the symbol (s) represent when it is next to an atom?
Answers
Answer:
The symbol for an atom indicates the element via its usual two letter symbol, the mass number as a left superscript, the atomic number as a left subscript (sometimes omitted), and the charge as a right superscript.
Explanation:
I hope that helps!! sorry if it dont!
5. _______H2O2 → ________ H2O + O2
a. 2, 3
b. 2, 1
c. 2, 4
d. 2, 2
6. _______ Ca + N2 → Ca3N2
a. 2
b. 3
c. 4
d. 6
7. _______Li + F2 → ______LiF
a. 2, 2
b. 2, 1
c. 2, 3
d. 2, 4
8. _______Mg + N2 → Mg3N2
a. 2
b. 3
c. 4
d. 6
9. ______NH3 → ______N2 + ______H2
a. 2, 2, 2
b. 2, 2. 3
c. 2, 3, 2
d. 2, 4, 2
10. ______HCl → H2 + Cl2
a. 2
b. 3
c. 4
d. 6
Answers
Answer:
Hope this helps! （；＿；)/
Explanation:
Dogs and shrews are both members of this class:
O carnivora
O mammalia
O chordata
O canidae
