Answer:
B.
Explanation:
thermal expansion♡
answer:
I think is B. Thermal expansion is when an object's volume
decreases due to heat increase.
11. Which does not affect the viscosity of a liquid?
a. Capillary action
b. Intermolecular attractive forces
c. Size and shape of molecules
d. Temperature of the liquid
Answer:
d. Temperature of the liquid
Explanation:
The viscosity of a fluid is determined by temperature, pressure (at very high values), and concentration. The viscosity of a fluid reduces as the temperature rises, resulting in an increase in molecular mobility. When high pressure is applied, it has a minor effect on pressure. The viscosity and concentration have a direct relationship.
When comparing a mole of oxygen and a mole of sulfur, how many atoms does each have?
Answer:
both contains 6.02 x 1023 atoms
Explanation:
Pls, choose me as brainliest!
What does a magnetic force from a magnet cause objects to do?
Answer:
they pull or push on objects without touching them
Explanation:
An alkyne with six carbon atoms per
molecule has relative molecular mass
of [C = 12, H = 1]
72,
82
84
86
Explanation:
C6H10
12(6) + 1(10)
= 72 + 10 = 82
The relative molecular mass of the alkyne with 6 carbon atoms is 82 gram/mole.
What is molecular mass?Molecular mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molecular mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
The molar mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.
Molecular masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.Relative molecular masses are also calculated by the same method.
In case of an alkyne with formula C₆H₁₀ relative molecular mass is calculated as, 12×6 +1×10=82 g/mole.
Hence, the relative molecular mass of an alkyne with 6 carbon atoms is 82 g/mole.
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If NaCl has a solubility of 36. 0 g in 100. G of H2O at 20∘C, how many grams of water are needed to prepare a saturated solution containing 59. 0 g of NaCl ?
Answer:
our search - If NaCl has a solubility of 36. 0 g in 100. G of H2O at 20∘C, how many grams of water are ... - did not match any news results.
Suggestions:
Explanation:
2. A student knows the mass of one of the reactants of a chemical reaction and wants to calculate the mass of one of the products of the reaction. Which process should the student follow?
A Multiply the mass of the reactant by its molar mass to find the number of moles of the reactant. Use the chemical equation to find the number of moles of the product. Divide the number of moles of the product by its molar mass to find the mass of the product.
B Divide the mass of the reactant by its molar mass to find the number of moles of the reactant. Use the chemical equation to find the number of moles of the product. Divide the number of moles of the product by its molar mass to find the mass of the product.
C Divide the mass of the reactant by its molar mass to find the number of moles of the reactant. Use the chemical equation to find the number of moles of the product. Multiply the number of moles of the product by its molar mass to find the mass of the product.
D Multiply the mass of the reactant by its molar mass to find the number of moles of the reactant. Use the chemical equation to find the number of moles of the product. Multiply the number of moles of the product by its molar mass to find the mass of the product.
Answer:
1. The mass of the reactants must be equal to the mass of the products. The total number of moles of the reactants can be more or less than the total number of moles of the products.
2. Divide the mass of the reactant by its molar mass to find the number of moles of the reactant. Use the chemical equation to find the number of moles of the product. Multiply the number of moles of the product by its molar mass to find the mass of the product.
3. 2(108 g/mol)+32 g/mol=248 g/mol; (248 g/mol)(0.02 mol)=4.96 g
4. 19.5 g
5. 853.5 g
Explanation:
Quick Check 5/5
Multiply the number of moles of the product by its molar mass to find the mass of the product. Therefore, the correct option is option C.
What is mass?A body's mass is an inherent quality. Prior to the advent of the atom as well as particle physics, it was widely considered to be tied to the amount of matter inside a physical body.
A student knows the mass of one of the reactants of a chemical reaction and wants to calculate the mass of one of the products of the reaction. Divide the mass of the reactant by its molar mass to find the number of moles of the reactant. Use the chemical equation to find the number of moles of the product. Multiply the number of moles of the product by its molar mass to find the mass of the product.
Therefore, the correct option is option C.
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7. Calculate the percent composition of ZnSO4.
% composition = Ar/Mr x 100%
MM (molar mass) ZnSO₄ = 161 g/mol
AM (atomic mass) Zn = 65.38 g/mol
% Zn = 65.38/161 x 100% = 40.6%
AM (atomic mass) S = 32 g/mol
% Zn = 32/161 x 100% = 19.9%
AM (atomic mass) O = 16 g/mol
% Zn = 4.16/161 x 100% = 39.6%
How much kinetic energy does a 2kg object have if it is traveling at a velocity of 2m/s?
Answer:
Given, Mass of an object, m = 2kg
velocity, v = 2m/s
We have,
KE = 1/2 m v²
= 1/2 × 2 (2)²
= 1/2 × 8
= 4J
Hence, 4J is the required Kinetic energy.
Any physical matter that is obtained or made from plants, animals, or the ground without undergoing a chemical process is called a natural material?
True
False
Any physical matter that is obtained or made from plants, animals, or the ground without undergoing a chemical process is called a natural material. This is a true statement.
Features of natural materialsNatural materials are the physical matters that are made from plants, animals and ground(environment) which has not been subjected to any chemical processes for modification.
But any natural material that has undergone any chemical process which has been designed and manufactured to fulfil a particular purpose is called a synthetic material.
Therefore, any physical matter that is obtained or made from plants, animals, or the ground without undergoing a chemical process is called a natural material.
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To make energy, a plant must get carbon, hydrogen, and oxygen atoms. What is the source of these atoms
Answer:
Carbon comes from the air and soil, hydrogen comes from absorbing water, H20, and breaking it down into Hydrogen and oxygen :) (also where oxygen comes from)
Explanation:
_______________ current runs parallel to the beach and brings the waves in at an angle carrying rock materials from the place of erosion to the place of deposition.
Wave Current run parallel to the beach and carry particles from one place and deposit it to another place.
What is Wave Current?Wave current is the movement of large water particles in all directions which is created by strong wind . Currents can be temporary or long-lasting. It can occur near the surface or in the deep ocean. It carries particles from one place and deposit it to another place.
Therefore, Wave Current run parallel to the beach and carry particles from one place and deposit it to another place.
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hello people ~
Metals like zinc and aluminium react with sodium hydroxide to produce ____ gas.
A. hydrogen
B. hydrogen sulphide
C. oxygen
D. sulphur dioxide
Answer:
it's hydrogen
Explanation:
ig it's correct
Which statement best describes one way that plate tectonics causes change
on Earth?
A. Convection currents in the mantle cause seafloor spreading over
time.
B. The movement of plates causes convection currents to form in the
mantle.
C. Seafloor spreading causes large mountain ranges to form on the
continents.
D. The subduction of oceanic crust helps drive convection currents in
the mantle.
Answer:
D
Explanation:
I took the test ^^
Answer: the answer is D. The subduction of oceanic crust helps drive convection currents inthe mantle.
Explanation:
explain whether rusting is physical or chemical process
Answer:
it is a chemical process
Explanation:
rusting is the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water.
The chemical formula for rust is Fe2O3 and is commonly known as ferric oxide or iron oxide. The final product is a series of chemical reactions simplified below as- The rusting of the iron formula is simply 4Fe + 3O2 + 6H2O → 4Fe(OH)3. The rusting process requires both the elements of oxygen and water.
How long is cooked beef good for in the refrigerator?.
Answer:
3 to 4 days is how long you can keep cooked beef in the refrigerator
What mass of magnesium oxide is formed when 12g of magnesium reacts with oxygen? 2Mg + O₂ → 2MgO ??????????? what is ittttttt :((
Answer:
12 grams
Explanation:
2Mg + O₂ → 2MgO
This means that 2 moles of Magnesium reacts with 1 mole of Oxygen gas to form 2 moles of Magnesium Oxide (refer to Gay Lussac's law i.e when gases react they do so in volumes that bear a simple ratio to one another and to the products formed (in gaseous state) provided that temperature and pressure are kept constant)
Thus, 12g of Mg = 12g of MgO because the mole ratio of Mg to MgO is 2:2
An alkaline battery produces electrical energy according to this equation
Zn+ 2MnO2+H2O-> Zn(OH)2+Mn2O3. Determine the limiting reactant if 25.0g of Zn and 30.0g of MnO2 are used.
6.How many moles of gas would be in contained in a 11.2 L container that is at a
pressure of 0.75 atm and 300 K?
A.0.17
B.034
C.1.37
D.7.31
0.34 moles of gas would be contained in a 11.2 L container that is at a pressure of 0.75 atm and 300 K.
HOW TO CALCULATE NUMBER OF MOLES?The number of moles of a substance can be calculated using the following expression:
PV = nRT
Where;
p = pressure (atm)v = volume (L)n = number of molesR = gas law constantT = temperature0.75 × 11.2 = n × 0.0821 × 300
8.4 = 24.63n
n = 8.4 ÷ 24.63
n = 0.34 moles
Therefore, 0.34 moles of gas would be contained in a 11.2 L container that is at a pressure of 0.75 atm and 300 K.
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Propane burns according to the following reaction:
C3H8 + 5O2 → 3CO2 + 4H2O
What volume of carbon dioxide is produced if 25.0 m3 of propane at atmospheric pressure is combusted?
Answer:
Propane burns in air according to the following equation:
C
3
H
8
+5O
2
→3CO
2
+4H
2
O.
1 mole of propane combines with 5 moles of oxygen.
Volume is directly proportional to the number of moles.
1 cm
3
of propane will combine with 5 cm
3
of oxygen.
Only 20% of air contains oxygen. So 1000 cm
3
of air contains 1000cm
3
×
100
20
=200cm
3
of oxygen.
The volume of propane that is consumed on using 1000 cm
3
of air is
5
200cm
3
=40cm
3
.
Reaction
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Avogadro: at the same T and P, the ratio of gas volume = the ratio of gas moles
volume of CO₂ = 3/1 x 25 = 75 m³
The electron configuration of an element is 1s22s22p63s1. Describe what most likely happens when an atom of this element comes near an atom having seven valence electrons.
PLEASE HELP!!!!!!!
Answer:
The element with electron configuration 1s² 2s² 2p⁶ will most likely not react with an element having seven Valence electrons.
The electron configuration of the element in discuss is 1s² 2s² 2p⁶.
The element has enough electrons to fill it's energy level, n = 2 shell.
In essence, the element in discuss is unreactive as it has attained it's octet configuration and as such is neither in need of an electron nor ready to donate an electron.
As such, although an atom having seven Valence electrons is highly electronegative and as such is an electron attractor, the element with the full octet configuration does not react with it.
This unreactive nature of noble gases is attributed to the full octet configuration of noble gases.
P.S: The electron configuration above is the electron configuration of Neon, Ne.
If an acid is added to different samples of buffered water, the sample with the
strongest buffer will
A). react with acid that is added and make a base.
B). not change its pH if acid is added to the water.
C). accept more acid before its pH reaches 4.5.
Answer:
A). react with acid that is added and make a base.
explanation:
Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added.
Answer:
react with acid that is added and make a base
Explanation:
Buffer solutions are made when a solution of weak acid is mixed with its conjugate base.
Here the buffer solution will react with the strong acid .
During sublimation the particles in a
solid
A. do not change their energy level.
B. do not gain enough energy to become a liquid.
C. gain so much energy, they turn to gas without becoming
a liquid
D. convert mechanical energy to sound energy.
Answer:
A. Do not change their energy level.
Explanation:
The process in which a solid changes directly to a gas is called sublimation. It occurs when the particles of a solid absorb enough energy to completely overcome the force of attraction between them. Dry ice (solid carbon dioxide, CO2) is an example of a solid that undergoes sublimation.
What does the law of reflection state?
A. The angle of incidence is greater than the angle of refraction.
B. The angle of incidence is equal to the angle of reflection.
O C. The angle of incidence is greater than the angle of reflection.
D. The angle of incidence is equal to the angle of refraction.
Answer:
B is the correct answer
How many molecules are in 15.0 g of oxygen gas (O2)?
Answer:
2.82*10^23
Explanation:
please see attached for work!
When 70. g of Li3N(s) (molar mass 35 g/mol) reacts with excess H2(g), 8.0 g of LiH(s) is produced. The percent yield is closest to
The percentage yield for the reaction between [tex]Li_3 N_{(s)}[/tex] and [tex]H_2[/tex], which resulted in the production of [tex]LiH_{(s)}[/tex], is 25%.
To calculate the per cent yield, we multiply the theoretical yield by 100.
There can be a significant difference in the theoretical and actual yield.
Li₃N(s) + 2 H₂(g) ⇄ LiNH₂(s) + 2 LiH(s)
[tex]70 g Li_3N *\frac{ 1 mol Li_3 N}{35 g} = 2 mol Li_3N\\2 mol Li_3N * \frac{2 mol LiH}{1 mol Li_3N} \\4 mol LiH * \frac{7.05 g LiH}{ 1mol LiH} = 28.20[/tex]
Percentage yield = [tex]\frac{Actual Yield}{Theoretical Yield} * 100[/tex]
[tex]\frac{8.0g}{28.20 g}[/tex] ≅ 25
From the above calculation, we found that the per cent yield is closest to 25%.
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Your question is incomplete, the probable question is:
Li₃N(s) + 2 H₂(g) ⇄ LiNH₂(s) + 2 LiH(s) ΔH° = -192 kJ/molrxn Because pure H₂ is a hazardous substance, safer and more cost-effective techniques to store it as a solid for shipping purposes have been developed. One such method is the reaction represented above, which occurs at 200 °C. When 70 g of [tex]Li_3N_{(s)}[/tex] (molar mass 35 g/mol) reacts with excess H₂(g), 8.0 g of LiH(s) is produced. The per cent yield is closest to:
How many grams are there in 0.37 moles of H2O?
i think the answer would be 77 grams
Answer:
Hello there buddy
I believe your answer is
6.6656536
Hope it’s helps you buddy :)
Explanation:
~AwesomeJayden
Consider the following observation by a student who was carrying out an experiment to prepare a solution of salt in the laboratory. "When 5 g of salt is added to 50 cmof warm water and stirred, all the salt dissolved. However, when 5 g of the same salt is added to 50 cm of cold water, some of it remained insoluble.
State the inference for this experiment based on the above observation.
tempreture
Explanation:
okay so the salt dissolved in the hot water because the hot water carried some latent heat and this latent heat was able to overcome and break the bonds of the salt therefore making it soluble whilst the cold water wasn't because it didn't have enough energy to overcome the bonds between the molecules of the salt
6. Although Inigo and the masked man are rivals, they actually have a lot
in common.
Give three examples from the swordfighting scene that show their
similarities.
The three (3) examples from the sword fighting scene that showed Inigo and the masked man's similarities are:
They can fight with both hands.They are both professional swordsmen. Inigo and the masked man discussed about their life.Who is Inigo?Inigo Montoya was one of the fictional character in the novel titled "The Princess Bride" and written by William Goldman's in 1973. Inigo hails from the village called Arabella and he was raised by his father Domingo Montoya, who was a master craftsman that makes sword.
In The Princess Bride, Inigo had a swordfight with a man in black (masked man) and they have the following things in common:
They can fight with both hands.They are both professional swordsmen. Inigo and the masked man spoke about their personal life.Read more on Inigo here: https://brainly.com/question/1130107
Part 1. A slightly inflated balloon is placed about eight centimeters above a burning candle. Explain the change to the size of the balloon based on the kinetic molecular theory.
Part 2. The same balloon is now placed in a bucket of ice cold water. Explain the change to the size of the balloon based on the kinetic molecular theory.
In both cases, assume the balloon is tied tight enough so that air does not escape. (10 points)
The balloon expands above the candle but contracts in a bucket of ice.
Kinetic theory of matterAccording to the kinetic theory, gases are composed of molecules which are in constant random motion. Temperature is a measure of the average kinetic energy of the molecules of the gas.
If a balloon is held above a burning candle, the gas in the balloon expands according to Charles law. This is because, the molecules of the gas receive more energy, move faster and spread out.
When the balloon is placed in a bucket of ice. The molecules of the gas loose energy and contract hence the balloon shrinks.
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Answer:
Part 1: The balloon will expand because molecules in the gas are receiving more energy (heat), and are now moving faster and spreading out.
part 2: The balloon will contract since the molecules are losing the energy that was gained by the candle.
Explanation:
If a sodium citrate sample drawn for coagulation is noted to be filled an inch below the fill line (black line), then the specimen is considered:
If a sodium citrate sample for coagulation is noted to be filled an inch below the fill line, then the specimen is considered unacceptable for coagulation studies. It alters the properties of blood.
What is blood coagulation?Blood coagulation (clotting) is a natural process by which blood cells form a gel known as a blood clot.
The blood clot generates a protective barrier against the entry of harmful substances inside the body.
Sodium citrate can be used in coagulation studies because blood factors V and VIII are relatively more stable in media that contain this substance.
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