A common liquid contains 11.19% hydrogen
and 88.81% oxygen by mass.
a) Calculate the number of moles of hydro-
gen atoms and oxygen atoms in 100.0 g of
this liquid
b) Calculate the number of hydrogen and
oxygen atoms in 100.0 g of this liquid.
c) Knowing that the molar mass of this liquid is
18.00 g.mol', calculate how many moles of
hydrogen atoms, and how many moles of
oxygen atoms are present in a mole of this
substance.
d) What is the number of hydrogen and oxy-
gen atoms present in one molecule of this
substance. Deduce the molecular mass of
this liquid and write its molecular formula.
Guys I know its a big question but I really am confused I don't understand I really hope u help me thankk youu
Answer:
a-72.8213 mol
b-32 atoms
c-81736.817291 mol
d-62/7362 (ohms law)
I =q/t
The peppered moth population in a locality has light and dark moth varieties. Which moth variety is likely to survive if the environment of the locality becomes highly polluted? (3 points)
a
The dark variety, as they are not visible on the dark tree barks
b
The dark variety, as they are not visible on the light tree barks
c
The light variety, as they are not visible on the dark tree barks
d
The light variety, as they are not visible on the light tree barks
Answer:A
Explanation: yes
Explanation: its c
becuase iknow
Ude was asked by his teacher to draw an angle that measures 130 degrees. He isn't even sure where to start. Explain to Jude how you would use a protractor to draw this angle.
Answer:
Explanation:
To construct an angle of 130 degrees;
The first thing to do is to bisect a given line segment.
Let's say we measure an even straight line A to B. Line A to B is assumed to be 10 cm. Then, we will choose any convenient radius and draw an arc at A and B.
Then, we proceed by draw arcs to cut each other at P and Q. Join |PQ| to cut |AB| at R. R is the midpoint of |AB|.
After, we bisect a given line segment where point R which is half of line AB.
Using the R to B side;
Then, we place our protractor at R; Starting from zero degrees with the horizontal line (parallel to side B) . we mark out angle 130° after we have counted all the way from 0° to 130°. At 130°, we mark out the point (X) on the paper and draw the extended line till it joins at R.
The angle from B to X is angle 130°
describe how calcium may be used in the body
In case you don't know what Calcium Is:
a silver-white divalent metal, occurring combined in limestone, chalk, gypsum, etc., occurring also in vertebrates and other animals, as a component of bone, skeletal mass, shell, etc., and as a necessary element in nerve conduction, heartbeat, muscle contraction, and many other physiological functions.
Calcium can be found:
Calcium is a soft white chemical element found in bones and teeth
answer:
Using the definition..calcium may be used in the human body by nerve conduction, heartbeat, muscle contraction, and many other physiological functions.
·.•·°.hope this helped!!!·.•·°.
Why are there multiple types of ramps in the park?
Answer:
Each person has their own skill level. The smaller ramps are less risky and are for more beginner to amateur skaters. The larger ones are very risky but can be very nice if a person does tricks with it. They are geared for more experienced skaters. Different ramps allow for more people to hace fun skating without the risk of injury...
How many more valence electrons does chlorine need to satisfy the octet rule? Chlorine is in group 17
Answer:
1
Explanation:
Octet meaning 8. So if chlorine already has 7 valence electrons it will only need to get 1 more to be satisfied.
What questions, if we were to answer them, would
help us figure out why our hands feel colder when
they are wet than when they are dry?
Answer:
When our bodies are dry and wind blows by, we lose some energy to the air molecules. When are bodies are wet, we have a substance on our skin that likes to absorb heat. So when wind blows by, we lose a LOT of energy to the air molecules. When the body loses heat energy, our body temperature drops.
Explanation:
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In the modern periodic table, which of the following represents the last pair of elects for which Newlands' Law of Octaves would hold true?
1. AI and GA
2. AI and SI
3. NE and AR
4. MG and CA
Answer: Mg and Ca
Explanation:
In the modern periodic table, Mg and Ca are the last pair of elects for which Newlands' Law of Octaves would hold true.
Law of Octaves is the generalization that was made by Newlands. It states that when chemical elements are arranged based on their increasing atomic weight, then the ones that have the same chemical and physical properties will occur after an interval of seven elements.
In such a case, every eighth element will have identical properties when the elements in the periodic table are arranged based on their atomic masses.
Based on the above information, Magnesium (Mg) has an atomic number of 12 while Calcium (Ca) has an atomic number of 20. Therefore, the elements follow the law of Octaves as they have a difference of 8 in their atomic numbers.
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During ionic bonding, there is a transfer of electrons....
O from one metallic element to a different metallic element
O from one nonmetallic element to a different nonmetallic element
O from one metallic element to a different metalloid
O from one metallic element to a different nonmetallic element
Zinc metal reacts with hydrogen chloride to form zinc chloride and hydrogen gas
Answer:
Explanation:
The metal zinc readily reacts with hydrochloric acid to produce hydrogen gas (H2) and zinc chloride (ZnCl2). Every chemical reaction either produces or absorbs heat. In chemistry this effect is described as the reaction enthalpy. The zinc reaction produces the heat and hence has the negative enthalpy.
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why are state symbols used in chemical equations
Answer:
state symbol meaning
[s] solid
liquid
gas
aq] aqueous dissolved in water
Explanation:
often chemical equations are written showing the state that each substance is in. the [s] sign means that the compound is a sold. the l sign means the substance is a liquid. the aq sign stands for aqueous in water and means the compound is dissolved in water
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what happen when Nacl solution reacts with AgNo3solution .name the two types of reactions to which does it belong
Explanation:
A chemical reaction where two chemical compounds exchange ions with each other is called a double displacement reaction.
Also, when an insoluble salt is formed due to chemical reaction between two chemical compounds is called a precipitation reaction.
For example, [tex]NaCl(aq) + AgNO_3(aq) \rightarrow NaNO_3(aq) + AgCl(s)[/tex]
Here, ions are exchanged between the compounds [tex]NaCl[/tex] and [tex]AgNO_3[/tex] . Also, [tex]AgCl[/tex] is the precipitate formed.
how many meteor showers does the earth pass through as it orbits the sun?
Answer:
about 30 meteor showers
Explanation:
Balance this chemical equation
Answer:
3
Explanation:
On the left side we have 3 Calcium atoms and 6 fluorine atoms
that means there need to be the same number on the right side
in the CaF2 molecules we already have 2 fluorine atoms so by multiplying with 3 we get 3 Ca and 6F
non polar and polar substances don't mix because of
Explanation:
The molecules in the solute and solvent are only able to make dispersion forces with each other (as they aren't both polar). This only releases very little energy. Therefore overall, more energy is required than released and hence they won't mix.
please help!! i am struggling with this. first correct answer gets brainliest!
Answer: [tex]1.25dm^3[/tex] of unreacted oxygen is left.
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given volume}}{\text{Molar Volume}}[/tex]
[tex]\text{Moles of} CO_2=\frac{3.60dm^3}{22.4dm^3}=0.161moles[/tex]
[tex]\text{Moles of} O_2=\frac{7.25dm^3}{22.4dm^3}=0.324moles[/tex]
[tex]C_3H_8(g)+5O_2(g)\rightarrow 3CO_2(g)+4H_2O(l)[/tex]
According to stoichiometry :
3 moles of [tex]CO_2[/tex] = 5 moles of [tex]O_2[/tex]
Thus 0.161 moles of [tex]CO_2[/tex] =[tex]\frac{5}{3}\times 0.161=0.268moles[/tex] of [tex]O_2[/tex]
moles of [tex]O_2[/tex] left unreacted = (0.324-0.268) = 0.056
Volume of [tex]O_2[/tex] left unreacted = [tex]moles\times {\text {Molar volume}}=0.056mol\times 22.4dm^3/mol=1.25dm^3[/tex]
Thus [tex]1.25dm^3[/tex] of unreacted oxygen is left.
Unsaturated compounds _____.
do not readily react
have a high activation energy
require UV light to react
are very reactive
Answer:
are very reactive
Explanation:
Which of the following measurements are required to find the work done on an object?
1. The mass and volume of the object
2. The volume of the object and the distance the object moved
3. The force exerted on the object and the distance the object moved
4. The force exerted on the object and the time it took to move the object
Answer:
1.p=mV................
What most accurately explains whether liquid water or ice has a higher density, and why?
A) Ice has a higher density. Substances are always denser as solids than they are as liquids because the particles of solids have less energy to move and crowd closer together.
B) Liquid water has a higher density. Substances are always denser as liquids than they are as solids because the vibrations of solid particles create larger gaps between them.
C) Liquid water has a higher density. Ice crystals have an open hexagonal structure with some empty space in the middle, while liquid water does not.
D) Ice has a higher density. Solid ice has strong hydrogen bonds that hold the particles closer together, while liquid water does not form hydrogen bonds.
Answer:
I think your answer is either b or c but I think b is more likely to be your answer
balance:
_H3[PO4] —> _H4[P2O7] + _H2O
Answer:
2
Explanation:
Answer:
2H3[PO4] —> H4[P2O7] + H2O
Explanation:
What mass of nitrogen monoxide is formed in the reaction of 869kg ammonia and 2480kg oxygen gas? (Please show work)
Answer:
1533.6 kg NO
Explanation:
The reaction that takes place is:
4NH₃ + 5O₂ → 4NO + 6H₂OFirst we convert the masses of ammonia (NH₃) and oxygen gas (O₂) into moles, using their respective molar masses:
NH₃ ⇒ 869 kg ÷ 17 kg/kmol = 51.12 kmol NH₃O₂ ⇒ 2480 kg ÷ 32 kg/kmol = 77.5 kmol O₂77.5 kmol of O₂ would react completely with (77.5 kmol O₂ * [tex]\frac{4kmolNH_3}{5kmolO_2}[/tex]) 62 kmol of NH₃. There are not as many kmol of NH₃, so NH₃ is the limiting reactant.
Now we calculate how many kmol of NO are produced, using the limiting reactant moles:
51.12 kmol NH₃ * [tex]\frac{4kmolNO}{4kmolNH_3}[/tex] = 51.12 kmol NOFinally we convert kmol of NO to mass, using its molar mass:
51.12 kmol NO * 30 kg/kmol = 1533.6 kg NOActivity 7: Crossword Puzzle
Directions Complete the crossword by filling in the word that describes each clue
Across:
2. with two symmetrical shells - mirror images of each other.
the term "crinoid" means
5. rocktype made of layers of sand and clay
7. multicellular organisms that often live in colonies
Down:
1. exoskeletons are made up of this material
4. lived inside their shells
6. phylum where starfish and sea urchins belong
8. individuality of coral is called
Need answer po
Answer: 2. with two symmetrical shells - mirror images of each other.
the term "crinoid" means: 6. phylum where starfish and sea urchins belong
4. lived inside their shells: 1. exoskeletons are made up of this material
7. multicellular organisms that often live in colonies: 8. individuality of coral is called
Explanation:
Crinoid is a term that can be used to describe the radial symmetry of animals that have oral (side of mouth) and aboral surfaces (opposite to the mouth). It is characterized by the mouth at the top surface and surrounded by the arms for feeding it. This is a characteristic feature of animals like star fish and sea urchins and echinoderm animals.
The exoskeleton is a protective shell which protect the animal from the external environment like water, sunlight and predation.
The multicellular organisms that live in the colonies they form coral reef and individually the are called the coral polyp.
whats the number of moles of O2(g) needed to completely react with 8 moles of CO(g).
If Veronica spins in a circle with the compass in her hand, which force keeps the compass' needle pointing north?
A.
an electrical force
B.
a magnetic force
C.
a contact force
D.
a gravitational force
If Veronica spins in a circle with the compass in her hand, then the force which keeps the compass' needle pointing north is magnetic field.
What is magnetic force?The magnetic influence on moving electric charges, electric currents, and magnetic materials is described by a magnetic field, which is a vector field. In a magnetic field, a moving charge receives a force that is perpendicular to both its velocity and the magnetic field.
The magnetic field is defined as a region where the force is active along imaginary lines. This force has an effect on all magnetized objects from the south magnetic pole to the north magnetic pole, including the needle of a compass. The needle always points north magnetic pole under the influence of the Geomagnetic field.Hence the required force is a magnetic force.
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Why does the mass of steel wool increase after getting burned? Help pls
Answer:
heat and large amount of surface area
Explanation:
the heat and surface area allows the iron in the wool to combine with oxygen. by doing this it increases the mass of the steel wool
The mass of steel wool increases after burning because it reacts with oxygen in the air, leading to the formation of iron oxide.
After burning, steel wool's bulk grows due to the oxidation process. Iron oxide, also referred to as rust, is created when steel wool burns when it comes into contact with oxygen from the air.
The steel's iron reacts chemically with the oxygen to create iron oxide, which is heavier than the original iron. As a result of going through the oxidation process and becoming iron oxide, steel wool gains bulk.
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Both prokaryotes and eukaryotes have small, free-floating organelles. The cell makes these organelles from nucleic acids and amino acids found in food. Without these organelles, the cell could not make proteins. What are these organelles called? A. chloroplasts B. mitochondria C. ribosomes D. vesicles
Answer:
C. ribosomes
Explanation:
Both prokaryotic and eukaryotic cells contain certain structures called ORGANELLES. They possess some in common and others are not found in one or the other. According to this question, a small, free-floating organelle made from nucleic acid and amino acid is found in both eukaryotes and prokaryotes. This organelle is RIBOSOMES.
Ribosomes are organelles responsible for the synthesis of protein in both eukaryotes and prokaryotes. They can be found free-floating or attached to endoplasmic reticulum. Ribosomes are predominantly made of RNA (nucleic acid) and proteins i.e. Ribosomal RNA (rRNA) and proteins is their structural constituent. Hence, the organelle in this question is RIBOSOME.
Given: 36.7 grams of CaF2 is added to 300 mL water. Find molarity?
2 M
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Unit 0
Reading a Periodic TableUsing Dimensional AnalysisAqueous Solutions
Molarity = moles of solute / liters of solutionExplanation:Step 1: Define
36.7 g CaF₂
300 mL H₂O
Step 2: Identify Conversions
Molar Mass of Ca - 40.08 g/mol
Molar Mass of F - 19.00 g/mol
Molar Mass of CaF₂ - 40.08 + 2(19.00) = 78.08 g/mol
1000 mL = 1 L
Step 3: Convert
Solute
Set up: [tex]\displaystyle 36.7 \ g \ CaF_2(\frac{1 \ mol \ CaF_2}{78.08 \ g \ CaF_2})[/tex]Multiply: [tex]\displaystyle 0.470031 \ mol \ CaF_2[/tex]Solution
Set up: [tex]\displaystyle 300 \ mL \ H_2O(\frac{1 \ L \ H_2O}{1000 \ mL \ H_2O})[/tex]Multiply: [tex]\displaystyle 0.3 \ L \ H_2O[/tex]Step 4: Find Molarity
Substitute [M]: [tex]\displaystyle x \ M = \frac{0.470031 \ mol \ CaF_2}{.3 \ L \ H_2O}[/tex]Divide: [tex]\displaystyle x = 1.56677 \ M[/tex]Step 5: Check
Follow sig fig rules and round. We are given 1 sig fig as our lowest.
1.56677 M ≈ 2 M
help plz will mark brainliest xD
Answer:
Ions are atoms that have either gain or lose electrons from the neutral atom.
A loss of electrons results in a positive ion, called a cation, a gain of electron results in a negative ion called an anion.
Ionic compounds are formed by the combination of a cation and anion, or metal + nonmetal.
When naming ionic compounds, name the cation first, and the anion second, changing the ending to ide.
Explanation:
Hope it helped!
Answer:
• [ lost ] or [ gained ]
• [ cation ], [ anion ]
• [ metal ] + [ non-metal ]
• [ cation ] and the [ anion ] to [ compound with suffix "ide" or "ode" ]
Only 2.5% of Hydrosphere are freshwater, if only 31% of it are groundwater which we can drink right away, how many percent of our hydrosphere can be used as drinking water?
a. 0.78%
b. 1.73%
c. 12.4%
d. 28.5%
Answer:
a. 0.78%
Explanation:
Given data:
Total percentage of hydrosphere = 2.5%
Percentage of ground water = 31%
Percentage of hydrosphere we use for drinking = ?
Solution:
Percentage of hydrosphere we use for drinking = Percentage of ground water /100 × Total percentage of hydrosphere
By putting values,
Percentage of hydrosphere we use for drinking = 31 / 100× 2.5
Percentage of hydrosphere we use for drinking = 0.78%
4. What are the PRODUCTS of the chemical reaction pictured?
+
CH4
+
202
CO2
+ 2H20
A. CHand CO2
O B. CO, and H2O
Answer:
CH4 =Methane (one atom of carbon and four atoms of hydrogen). It is a group-14 hydride and the simplest alkane and is the main constituent of natural gas.
202= Oxygen.
CO2= Carbon dioxide (one Carbon atom and two oxygen atom)
2H20= 2H2O means two molecules of water(H2O)
CH and CO2= the main difference between CO2 and CO2e is that CO2 only accounts for carbon dioxide, while CO2e accounts for carbon dioxide
CO= Carbon monoxide (CO), a colorless, odorless, and tasteless gas. Carbonyl group, composed of a carbon atom double-bonded to an oxygen atom: C=O.
H2O = water ( one hydrogen atom and two oxygen atoms)