Answer:
In the early part of the 20th century, geologists studied the vibrations (seismic waves) generated by earthquakes to learn more about the structure of the earth's interior. They discovered that it is made up of these distinct layers: the crust, the mantle, and the core.
for the reaction
2Cl2 + 4NaOH → 3NaCl + NaClO2 + 2H2O,
how many grams of NaCl can be produced from 4.45g of Cl2 and excess NaOH?
:( please help..i need to turn this in later
i will mark you brainless
Answer:
Mass = 5.56 g
Explanation:
Given data:
Mass of Cl₂ = 4.45 g
Mass of NaCl produced = ?
Solution:
Chemical equation:
2Cl₂ + 4NaOH → 3NaCl + NaClO₂ + 2H₂O
Number of moles of Cl₂:
Number of moles = mass/molar mass
Number of moles = 4.45 g/ 71 g/mol
Number of moles = 0.063 mol
Now we will compare the moles of Cl₂ with NaCl.
Cl₂ : NaCl
2 : 3
0.063 : 3/2×0.063 =0.095 mol
Mass of NaCl:
Mass = number of moles × molar mass
Mass = 0.095 mol × 58.5 g/mol
Mass = 5.56 g
How many liters will a cubic box 36 inches long hold?
um... i'm just confuzed..
Answer:
1)no
2)yes
Explanation:
Answer:
I guess yes it seems like a trick question
Explanation:
CHEMISTRY HELP ASAPP
How many grams of argon would it take to fill a large light bulb with a volume of 0.745 L at STP?
A) 1.33 g
B) 0.0332 g
C) 0.846 g
D) 19.0 g
Answer:
Mass = 1.33 g
Explanation:
Given data:
Mass of argon required = ?
Volume of bulb = 0.745 L
Temperature and pressure = standard
Solution:
We will calculate the number of moles of argon first.
Formula:
PV = nRT
R = general gas constant = 0.0821 atm.L/mol.K
By putting values,
1 atm ×0.745 L = n × 0.0821 atm.L/mol.K× 273.15 K
0.745 atm. L = n × 22.43 atm.L/mol
n = 0.745 atm. L / 22.43 atm.L/mol
n = 0.0332 mol
Mass of argon:
Mass = number of moles × molar mass
Mass = 0.0332 mol × 39.95 g/mol
Mass = 1.33 g
How is universal indicator different form an ordinary indicator
Answer:
Ordinary indicator only identifies weather a given solution is acidic or basic. Whereas an Universal indicator not only identifies the nature of the the solution, but also gives information about the pH of the solution, thus informing about the strength of the acid/base.
Answer:
A universal indicator is better than an ordinary indicator as it not only shows whether the solution is acidic or basic but also gives the pH values (approx.) by giving a wide range of colours corresponding to different pH values.
How many atoms are in 5.9g of lithium carbonate, Li2(CO3)?
The number of atoms = 4.8 x 10²² atoms
Further explanationGiven
5.9 g of Lithium carbonate
Required
The number of atoms
Solution
mol Lithium carbonate(MW=73.9 g/mol) :
= mass : MW
= 5.9 g : 73.9 g/mol
= 0.08
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
So for 0.08 mol :
= 0.08 x 6.02.10²³
= 4.8 x 10²² atoms
CaCO3 + 2HCl→CaCl2+H2CO3 is an example of which type of reaction? Question 2 options: Single-Displacement Double-Displacement Combustion Decomposition
Answer:
Double replacement:
Explanation:
Double replacement:
It is the reaction in which two compound exchange their ions and form new compounds.
AB + CD → AD +CB
Chemical equation:
CaCO₃ + 2HCl → CaCl₂ + H₂CO₃
The given chemical reaction is example of double displacement reaction. In this type of reaction cation and anion of both reactant exchange with each other. We can see carbonate ion of calcium carbonate combine with hydrogen ion of HCl and form carbonic acid while chloride ions of HCl combine with calcium ion and form calcium chloride.
All other options are incorrect because,
Single replacement:
It is the reaction in which one elements replace the other element in compound.
AB + C → AC + B
Decomposition reaction:
It is the reaction in which one reactant is break down into two or more product.
AB → A + B
Combustion reaction:
In combustion reaction substances are burned in the presence of oxygen.
Answer:
double-displacement
Explanation:
I took the test :)
Mechanical waves don't require a medium.
True. Mechanical waves are able to travel through air, water and solids.
It depends on the type of mechanical wave.
False. Mechanical waves cannot travel through a vacuum.
True, but only medium mechanical waves need a medium.
Answer: False. Mechanical waves cannot travel through a vacuum.
Explanation:Type of wave that can travel through the vacuum of space - DOES NOT require a medium. ... False: A vacuum is empty space (no matter). Sound waves must have a medium (matter) in order to travel. Sound waves are mechanical waves.
You open the fridge and the milk is sour (spoiled). What has
happened?
O Observation of an extensive property
O Observation of a physical property
O A physical change.
O Achemical change
Answer:
D it's a chemical change
List at least one cause of chemical weathering.
Answer:
Chemical weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals clays and soluble salts. These reactions occur particularly when the water is slightly acidic.
Explanation:
4. What holds a moon in its orbit? *
Which coefficients will balance this equation? *
Ag +
C2 >
AC2
Answer:
16Ag + 2C2 ---> 4 Ag4C
Explanation:
Ag + C2 ----> AgC2
The valence of Ag is one
Valence of Carbon is four
A balanced equation would be
16Ag + 2C2 ---> 4 Ag4C
What is the standard model? What can it explain?
Answer:
The Standard Model of particle physics is the theory describing three of the four known fundamental forces (the electromagnetic, weak, and strong interactions, and not including the gravitational force) in the universe, as well as classifying all known elementary particles. It was developed in stages throughout the latter half of the 20th century, through the work of many scientists around the world, with the current formulation being finalized in the mid-1970s upon experimental confirmation of the existence of quarks.
Answer:
practice physical
Explanation:
The Standard Model of particle physics is the theory describing three of the four known fundamental forces in the universe, as well as classifying all known elementary particles.
If 3.75 moles of aluminum react, how many moles of sulfur are needed?
16 Al + 3S8 --> 8Al2S3
0.70 mol
0.050 mol
20 mol
16 mol
Answer:(A) 0.70 mol
Explanation:
The moles of sulfur needed would be 0.7.
From the equation of the reaction, the mole ratio of Al to S8 is 16:3, meaning that for every 16 moles of Al, 3 moles of S8 would be required.
Thus, if 3.75 moles of Al react, the mole of S8 that would be required can be calculated as:
16 moles of Al = 3 moles of S8 3.75 moles of Al = ?= 3 x 3.75/16
= 0.7 moles
More on moles can be found here: https://brainly.com/question/15209553?referrer=searchResults
Classify each of the following as either a physical change or a chemical change:
a. tearing a sheet of paper
b. melting a piece of wax
c. burning a log
d. milk souring
Answer:
physical change
a b c
chemical change
d
During a laboratory experiment, 9.68 g of iron reacted with excess sulfur to form 13.8 grams of iron II sulfide. Calculate the percent yield of this experiment. What would be the percentage yield if the Theoretical yield was 15.2 grams?
Answer:
Percent yield = 90.8%
Explanation:
The reaction of Fe with S to produce FeS is:
Fe + S → FeS
Where the moles of Fe added in excess of S are the moles of FeS
Now, percent yield is defined as 100 times the ratio between actual yield (13.8g of FeS) and theoretical yield (15.2g FeS):
Percent yield = 13.8g / 15.2g * 100
Percent yield = 90.8%which choice is an abiotic factor of an ecosystem?
A. minerals
B.fungi
C. ants
D.dogs
PLEASE HELP WILL GIVE BRINLY
Answer:
A. Minerals
Explanation:
Anything that is abiotic in nature is something that isn't living. Fungi is alive, so are dogs and ants.
Answer: Minerals is the correct answer.
Explanation: Sunlight, air, precipitation, minerals, and soil are some examples of abiotic factors. These factors have a significant impact on the survival and reproduction of species in an ecosystem. Answer is confirmed correct on the test. I hope this helps! Thanks!
how might some organelles in a cell
be compared to an Assembly line.
If a sound wave traveled from a solid to a liquid its speed would
O Not enough information to determine the answer.
Speed up
O Stay the same speed
O Slow down
What is the specific heat capacity of propane in J/gC?
Answer:
At ambient pressure and temperature the isobaric specific heat, CP, of gaseous propane is 1.68 kJ/kg K or 0.402 Btu/lb °F = cal/g K, while the isochoric specific heat, CV, is 1.48 kJ/kg K or 0.353 Btu/lb °F = cal/g K.
Explanation:
Hope this helps
HELP ASAP PLEASEE
the densitty of a gas in an unlabled container is 1.43g.l. is this gas oxygen,neon, or helium
BRAINLEST AND THANKS
Answer:
I believe its oxygen gas
Explanation: The density of a gas is 1.43 g/L
The cell wall is a part of the animal cell that give strength structure and rigidity to the animals
Answer: In other words, mitochondria
Explanation:
HELP!!! What has 5 valence electrons and is in period 3 on the periodic table?
Answer:
-182
+281
116ueuehehheue
The four beakers above each contain 100.-mL of different solutions of similar concentrations.
(a) The Kb for ammonia is 1.8 x 10^-5
(i) Which beaker is most likely to contain NH3(aq)? Provide a chemical equation to explain your answer.
(ii) Calculate the molarity of the solution in the beaker that you chose for (i).
(b) If the contents of beakers 3 and 4 are poured together and mixed thoroughly, what will be the resulting pH?
(c) Explain how it is possible that beakers 1 and 4 are acids with equal molarities.
HELP ASAP
Pleaseeeeeeeeee
Answer:
avery
Explanation:
Answer:
avery is more faster.
Explanation:
reese's speed = 10/5 = 2km/hr
reese's speed = 10/5 = 2km/hravery's speed = 15/5 = 3km/hr
reese's speed = 10/5 = 2km/hravery's speed = 15/5 = 3km/hrby seeing their speeds we can easily tell that avery is more faster than reese ...
PLZZZZZZZZZZZZZZZZZZ15. As much as 90 percent of the oxygen in our atmosphere is the result of
a. photoperiodism
c. thigmotropism
b. respiration
d. photosynthesis
Answer:
The correct answer is - option D. photosynthesis.
Explanation:
It is shown by the study that most of the atmospheric oxygen comes from the photosynthesis by plants as oxygen is the byproduct of the photosynthesis. Photosynthesis is the process that uses light energy, carbon dioxide, and water to produce food or glucose/sugar and release oxygen as the byproduct.
Many scientists believe that oceanic phytoplankton that releases oxygen by the photosynthesis process makes 80 to 85% of the total oxygen of the atmospheric oxygen.
Answer:
D. photosynthesis.
Explanation:
How many liters of water are needed to prepare a 1.67M solution of Ba(OH)2 if you need to dissolve 235g of it?
Answer: 2.04
Explanation:
Answer:
Approximately [tex]0.821\; \rm mol[/tex].
Explanation:
Look up the relative atomic mass of [tex]\rm Ba[/tex], [tex]\rm O[/tex], and [tex]\rm H[/tex] on a modern periodic table:
[tex]\rm Ba[/tex]: [tex]137.327[/tex].[tex]\rm O[/tex]: [tex]15.999[/tex].[tex]\rm H[/tex]: [tex]1.008[/tex].Calculate the formula mass of [tex]{\rm Ba(OH)_2}[/tex]:
[tex]\begin{aligned}& M({\rm Ba(OH)_2}) \\ &= 137.327 + 2\times(15.999 + 1.008) \\ &\approx 171.334\; \rm g \cdot mol^{-1}\end{aligned}[/tex].
Calculate the number of moles of [tex]{\rm Ba(OH)_2}[/tex] formula units in that [tex]235\; \rm g[/tex] of this compound:
[tex]\begin{aligned}& n({\rm Ba(OH)_2}) \\ &= \frac{m({\rm Ba(OH)_2})}{M({\rm Ba(OH)_2})} \\ &= \frac{235\; \rm g}{171.334\; \rm g \cdot mol^{-1}} \approx 1.37159\; \rm mol \end{aligned}[/tex].
Calculate the volume of a [tex]c({\rm Ba(OH)_2}) = 1.67\; \rm mol \cdot L^{-1}[/tex] with approximately [tex]n({\rm Ba(OH)_2}) = 1.37159\; \rm mol[/tex] of the solute:
[tex]\begin{aligned}& V({\rm Ba(OH)_2}) \\ &= \frac{n({\rm Ba(OH)_2})}{c({\rm Ba(OH)_2})} \\ &= \frac{1.37159\; \rm mol}{1.67\; \rm mol \cdot L^{-1}} \approx 0.821\; \rm L \end{aligned}[/tex].
Predict the product of Ca + H2O (Single Replacement). If y'all can add an explanation as well, that would be much appreciated!!
Answer:
Ca + H2O------->CaO+H2
since ca combine with oxygen.
please help me with this. i also need to know what the word heat means.
