A sample of sodium hydroxide (NaOH) has a mass of 160. 0 g. The molar mass of NaOH is 40. 00 g/mol. How many moles of NaOH does this sample contain? 4. 000 moles 40. 00 moles 160. 0 moles 6,400 moles.
4 moles of NaOH is present in the given 160 grams of NaOH.
How we calculate moles?Moles of any substance will be calculated as:
n = W/M, where
W = given mass of NaOH = 160 grams (given)
M = molar mass of NaOH = 40 g/mole
Moles of NaOH is calculated as:
n = 160g / 40g/mol = 4 moles
Hence, moles of sodium hydroxide (NaOH) is 4 moles.
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Common observations of a chemical reaction are described in the Introduction section. For each observation, name a common or everyday occurrence that must involve a chemical reaction.
Look at pic, need it asap!
Answer:
12x+4x-7y+45b+78a-44b+1a+1z+0d+1.1a+1.1a
Which stimulus is an example of an internal stimulus?
A. an artificial light that attracts insects
B. an increase in the amount of water available to a plant
C. a decrease in oxygen levels in the blood during exercise
D. a sudden change of air temperature
An example of an external stimulus is a decrease in oxygen levels in the blood during exercise.
Option C
What is stimulus?A stimulus is defined as a thing or sensation that causes a specific reaction in an organ or tissue of a living organism
There are two types of stimuli:
Internal stimulusExternal stimulusLearn more about stimulus:
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Answer:
An example of an external stimulus is a decrease in oxygen levels in the blood during exercise.
Option C
What is stimulus?
A stimulus is defined as a thing or sensation that causes a specific reaction in an organ or tissue of a living organism
There are two types of stimuli:
Internal stimulus
External stimulus
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Explanation:
The chemical equation below shows the burning of magnesium (mg) with oxygen (o2) to form magnesium oxide (mgo). 2mg o2 right arrow. 2mgo the molar mass of o2 is 32.0 g/mol. what mass, in grams, of o2 is required to react completely with 4.00 mol of mg? 2.00 grams 64.0 grams 128 grams 256 grams
Explanation:
64 grams of O_2O2 will be required to react completely with 4 moles of Mg.
As per the balanced chemical equation 2 moles or 48 g of Mg reacts with one mole or 32 g of oxygen. Hence, 4 moles of Mg requires 2 moles or 64 grams of oxygen gas.
What is magnesium oxide ?Magnesium oxide (MgO) is a white solid mineral that occurs naturally as the mineral periclase. It is one of the most common and important magnesium compounds, and is widely used in many industrial and commercial applications.
The balanced chemical equation of the reaction between Mg and oxygen is given as follows:
2 Mg + O₂ ⇒ 2 MgO
As per the balanced chemical equation 2 moles or 48 g of Mg reacts with one mole or 32 g of oxygen. Hence, 4 moles of Mg requires 2 moles or 64 grams of oxygen gas.
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Runoff from agricultural land carries chemicals from fertilizers that collect in a lake. The buildup of chemicals can eventually cause:.
Answer:
what are the roles of minerals in maintaning homeostasis?
Escribe la configuracion electronica de 2 elementos no metalicos y dos elementos pertenecientes a los gases nobles.
IMPORTANTE AYUDA
ND DE RESPUESTAS RARAS SOLO POR PUNTOS PLS!!
Answer:
(See explanation)
Explanation:
2 Non-Metal Elements:
Oxygen:
[tex]1s^{2} 2p^{2} 2p^{4}[/tex]
or it's noble gas configuration: [He] 2s² 2p⁴
Carbon:
[tex]1s^{2} 2p^{2} 2p^{2}[/tex]
ot its noble gas configuration: [He] 2s² 2p^2
Noble Gasses:
Xenon:
[Kr] 4d¹⁰ 5s² 5p⁶
Argon:
[Ne] 3s² 3p⁶
Petroleum lowest boiling point
plssssss
95 C/ 203 F
Explanation:
Rank the following in order from the most energy released to the least energy released:________.
(a) uranium-235 splitting into two equal fragments,
(b) uranium-235 splitting into three equal fragments,
(c) uranium-235 splitting into 92 equal fragments.
Rank from most to least. To rank items as equivalent, overlap them.
A
B
C
The ranking is uranium-235 splitting into 92 equal fragments, three equal fragments, and two equal fragments. It also releases radiation.
What is nuclear fission?Nuclear fission refers to a natural chemical reaction where an atom nucleus splits into two or more fragments.
This process (nuclear fission) is well known to release huge amounts of energy and radiation.
The more will be the number of atomic fragments, the more will the energy and radiation released by the process of nuclear fission.
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Describe in your own words how mol/L compares to grams/liter. (similarities and differences)
Both mol/L and g/l are units of concentrations. Mol/L is molar concentration while g/L is mass concentration.
Concentration unitsConcentration refers to the amount of substance in a solution. The two main ways of measuring concentration are;
Molar concentrationMolar massThe molar concentration is measured in mol/L and describes the amount of substance in a litre of solution.
The mass concentration is measured in g/L and measures the mass of the substance in 1 L of solution.
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Using the bond energy values in the previous question, which molecule
releases the most energy when forming its bonds? *
H2
Cl2
Br2
bond energies:
H-H 432
CI - CI 239
Br-Br 193
i cant tell if its h2 or br2 because im not sure what the question is asking
Hydrogen molecule is a molecule that releases the most energy when forming its bonds as compared to other molecules.
What bond needs more energy?We know that H-H bond energy is 432 kJ mol-1, CI - CI bond energy is 239kJ mol-1 and Br-Br bond energy is 193 kJ mol-1 so from this data we can conclude that more energy is required to break the bond between hydrogen atom.
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Help↷
The efficiency of a fuel is expressed in terms of its ________.
A. density
B. calorific value
C. volume
D. purity
⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻
[B] Calorific Value
⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻
Explanation:
The correct answer is [B] Calorific value
Calorific Value ⇒ Amount of energy (heat) produced on burning 1 kg of a fuel completely in air. Which expressed in a unit called kilojoule per kilogram. (kj/kg)
Hence, [B] Calorific value is the answer.
~Lenvy~
Answer:
B. calorific value
Explanation:
Fuel efficiency is measured in terms of calorific value, which is measured in kilojoules per kilogramme. It is the amount of heat produced by the complete combustion of one kilogramme of fuel.
I am joyous to assist you at any time.
who like math ? Cause I don’t.
Answer:
heheheheheh... I like it
If Earth is in between the sun and the Moon in both Image 1 and Image 2, why do you think a lunar eclipse is only happening in Image 2?
Answer:
In image 1, the moon is in a certain spot in its tilted elliptical orbit, so it is effectively under the Earth from the Sun's perspective. But in image 2, The moon is actually behind the Earth from the Sun's perspective.
Explanation:
I kinda' explained in my answer
In image 2, the lunar eclipse because the earth's shadow falls on the surface of the moon when Earth, moon, and sun all are aligned in a straight line.
What is a lunar eclipse?A lunar eclipse usually takes place when the Moon moves into the shadow of the earth. This eclipse happens only when the Sun, Earth, and Moon are exactly aligned with Earth between the other two, which can occur only on the night of a full moon when the Moon is close to the lunar node.
When the moon is eclipsed by the Earth, it gets on a reddish color that is caused by the planet when it fully blocks direct sunlight from reaching the Moon's surface, as only the light reflected from the lunar surface has been refracted by the atmosphere of the earth. Due to the Rayleigh scattering of blue light, this light appears reddish.
A total lunar eclipse lasts up to nearly 2 hours, lunar eclipses are safe to view. Therefore, image 2 represents the lunar eclipse.
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What are at least 3 places carbon can be found?
Answer:
Carbon can be found in the ocean, rocks, and the atmosphere around us.
Imagine you are working in the lab and your chemical bottle is labeled Fe2O3. Explain how you could
determine if the iron in the compound is Fe+2 or Fe+3. Provide the name of the compound in your
answer.
Which organelle stores water, sugar, and waste products in plant cells?
vacuoles
the cell wall
chloroplasts
ribosomes
Answer:
The first one - Vacuoles
Explanation:
Hope this helps. :)
Which statement best describes why electrons are typically not included when determining the mass of an atom?
Answer:
Are there any letters? if so. Letter B
Explanation:
Answer:
The charge of a proton cancels the charge of an electron.
Explanation:
if i thing you have the same paper as me it is B
Which of the following is the name of the process occurs in the sun, in which two hydrogen nuclei combine to make when helium nucleus 
Answer:
This is called nuclear fusion. It takes four hydrogen atoms to fuse into each helium atom.
Penny reads 11 pages in 1/3 hours what is the unit rate for pages per hours ?
Answer: 33/ because 1/3 of a 11 is 33.
Explanation:
All you had to do was multiply 11 with 3 thats it.
The Rock Shown is Made of Light and Dark Mineral Crystals that are Evenly Distributed.
Which phrase describes the most likely
environment in which this rock formed?
A. Very High Temperature and Pressure
B. Very Low Temperature and Pressure
C. Very Low Temperature and Very High Pressure
D. Very High Temperature and Very Low Pressure
Answer:
It Is A
Explanation:
I took the test and that was the answer
Answer:
high tmp and pressure
Explanation:
Calcium hydroxide and phosphoric acid react to form calcium phosphate and
water
Answer:
if you are asking for the chemical reaction:
Ca(OH)2 + H3PO4-------> Ca3(PO4)2 + H2O
Explanation:
In this reaction, phosphoric acid, H3PO4 , a weak acid, will react with calcium hydroxide, Ca(OH)2 , a strong base, to produce calcium phosphate, Ca3(PO4)2 , an insoluble salt, and water.
A sample of gas has an initial volume of 20 L and an initial pressure of 2.5 atm. If the pressure changes to 3.1 atm, what is the new volume, assuming that the temperature remains constant?
Answer:
The answer is 16.12 L
Explanation:
2.5 * 20 = 3.1 * V2
V2 = 50/3.1
V2= 16.12 L
hope this helps
The new volume can be calculated using Boyle's law. If the pressure increases from 2.5 atm to 3.1 atm, then volume decreases from 20 L to 16.1 L.
What is Boyle's law ?Boyle's law is a fundamental law of physics that describes the relationship between the pressure and volume of a gas at a constant temperature. It is named after the Irish physicist Robert Boyle, who first stated the law in the mid-17th century.
Boyle's law states that at a constant temperature, the pressure of a gas is inversely proportional to its volume. This means that as the volume of a gas decreases, its pressure increases proportionally.
Hence,
P1V1 = P1V2.
given,
P1 = 2.5 atm
V1 = 20 L
P2 = 3.1 atm
then V2 = P 1 V1 /P2
V2 = 2.5 atm × 20L/3.1 atm = 16.1 L.
Therefore, the new volume of the gas is 16.1 L.
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2. True or false. The body does not digest cellulose.
True
False
How can rain provide minerals for a rain forest in South America?
Answer:
That's the answer
Explanation:
Your welcome
2K(5) + Cl2(g) → 2KCI(S)
what type of chemical reaction is this
Answer:
Synthesis Chemical Reaction
Explanation:
A+B -> AB
Explain anaerobic respiration with yeast in your own words
Answer:
Anaerobic respiration takes place in the absence of oxygen.
Anaerobic respiration in yeast is used during brewing and bread-making.
Explanation:
glucose → ethanol + carbon dioxide.
C 6H 12O 6 → 2C 2H 5OH + 2C0 2.
A gas has a volume of 9.3 L at 27C . What is it’s temperature at 7.5 L? (DONT FORGET TO CONVERTVRO KELVIN)
Answer:
T2 = 242.06
Explanation:
Follow this equation to find T2: V1/T1 = V2/T2
V1 = 9.3L
T1 = 27C (to convert to Kelvin + 273.15) ---> 27 + 273.15 = 300.15K
V2 = 7.5L
T2 = ?
V2×T1/V1 = T2
7.5×300.15/9.3 = T2
242.06 = T2
So 242.06 is the answer!
B. from 52 moles of nitric acid, how many moles of silver nitrate will be produced?
Answer:
39 mol AgNO3
Explanation:
We have the equation 4HNO3 + 3Ag -----> 3AgNO3 + NO + 2H2O
We want to calculate the number of silver nitrate (AgNO3) moles that would be produced from 52 moles of nitric acid ( HNO3 )
We can calculate this by using mole ratio as well as dimensional analysis.
The mole ratio of Silver nitrate to nitric acid based on the balanced equation is 3AgNO3:4HNO3.
Using this we can create a table: The table is attached.
Breakdown of the table.
The moles of nitric acid cancel out and we multiply 52 by 3/4 to get 39 moles of Silver nitrate.
Calculate the pH for the following solutions and indicate whether each solution is acidic or basic.
[OH-] = 1.0 × 10-2M pH = __________ Acid/Base
Answer:6=base
Explanation:
Calculate the molarity of a solution that contains 0.37g CaCl2 in 340 milliliters of solution
Answer:
Your search - Calculate the molarity of a solution that contains 0.37g CaCl2 in 340 milliliters of solution - did not match any news results.
Explanation: