Answer:
Well, the mass of the products is equal to the mass of the reactants.
Explanation:
The law of conservation of mass states that,
For any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as system's mass cannot change, so quantity cannot be added nor removed.
Taken from here.
Suppose we have the balanced equation of combustion of hydrogen to form water.
The equation will be:
2H2(g)+O2(g)→2H2O(g)
Now, we look at the total mass of the reactants and compare it with the mass of the products.
H2 has a mass of 1⋅2 amu, and so 2H2 will have a mass of 2⋅2=4 amu.
O2 has a mass of 16⋅2=32 amu.
So, the total mass of the reactants (2H2+O2) is equal to 4+32=36 amu.
Now, let's take a look at the mass of the products.
Water has a chemical formula of H2O.
In here, there are two hydrogen atoms and one oxygen atom, and so its mass will be 2+16=18 amu.
There are two water molecules formed, and that means the total mass of the products is 18⋅2=36 amu.
As you can see now, the mass of the products is equal to the total mass of the reactants together, and the chemical equation obeys the law of conservation of mass.
Note that this applies to every balanced chemical equation.
What formula is used to determine the density of an object?
Answer:
Density = m/v, where m is mass and v is volume
[tex]\Large \boxed{\displaystyle density \ (kgm^{-3})=\frac{mass\ (kg)}{volume \ (m^3)} }[/tex]
What is dimensional formula of specific heat
capacity with process
.
Answer:
The heat capacity of an object is an amount of energy divided by a temperature change, which has the dimension L2·M·T−2·Θ−1. Therefore, the SI unit J/K is equivalent to kilogram meter squared per second squared per kelvin (kg m2 s−2 K−1 ).
Explanation:
What is the gravitational force cause
Answer: Gravity
Explanation: The answer is gravity: an invisible force that pulls objects toward each other. ... So, the closer objects are to each other, the stronger their gravitational pull is. Earth's gravity comes from all its mass. All its mass makes a combined gravitational pull on all the mass in your body.
What is the major difference mentioned in regard to the difference between cartilage and bone?
A)Structure of the tissue
B Shape
C) Location in the body
D) The cells that make up each tissue
which is the correct answer
Answer:
Structure of the tissue
Explanation:
Cartilage is more soft compared to the bone
how many moles are in 654.5 grams of AgCl
Answer:
The molar mass is known to be 98.96 g/mol. 71.65g Clx. = 2.021mdl C1/2021 = 1. CH₂Cl. Jund Cl.
Explanation:
142.8 g of NaCl is dissolved in enough water to make a 2.3 L of solution, what is the molarity of the solution?
A solution contains 67.5 % of magnesium chloride (MgCl2) dissolved in water. What is the molality of the solution?
62.5 g of sugar (C12H22O11) was dissolved in water to produce 250 g of sugar syrup. Calculate the molality and mole fraction of sugar in the syrup. For your answer please follow this: m = 0.5 and Xsugar = 0.5
What are the mole fractions of hydrochloric acid (HCl) and water in a 48% solution? For your answer format follow this: Xsolute = 0.5 and Xsolvent = 0.5
A 0.770 M solution of potassium nitrate (KNO3) contains 1.75 mol of solute. Calculate the volume of the solution.
Stoichiometry can be used to determine the molality, molarity and volume of substances in a reaction.
What is concentration?
The term concentration refers to the amount of substance present in a solution.
1. Number of moles of NaCl = 142.8 g /52 gg/mol = 2.7 moles
Molarity = 2.7 moles/ 2.3 L = 1.17 M
2. 67.5 % of magnesium chloride implies 67.5 g of MgCl2 in 100 g of solution.
Number of moles of MgCl2 = 67.5 g/95 g/mol = 0.7 moles
molality = 0.7 moles/32.5 * 10^-3 = 21.5 m
3. Number of moles of the sugar = 62.5 g/342 g/mol = 0.18 moles
Number of moles of water = 250 g/18 g/mol = 13.9 moles
Since 1 g of water = 1 cm^3 water
Molarity = 0.18 moles/250 * 10^-3 = 0.72M
Molality = 0.18 moles/250 * 10^-3 = 0.72m
Mole fraction of sugar = 0.18/(0.18 + 13.9 ) = 0.01
Mole fraction of water = 13.9 /(0.18 + 13.9 ) = 0.99
4. A 48% solution of HCl contains 48 g of HCl in 100 g of water.
Number of moles of HCl = 48 g/36.5 g/mol = 1.3 moles
Number of moles of water = 52g/18 g/mol = 2.9 moles
Mole fraction of HCl = 1.3/(1.3 + 2.9) = 0.31
Mole fraction of water = 2.9/(1.3 + 2.9) =0.69
5. 1.75 mol = 0.770 M * V
V = 1.75 mol/0.770 M
V = 2.27 L
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which of these is important to gathering and interpreting scientific information?
A.) Logic
B.) Emotion
C.) Legend
D.)Religion
Answer:
A. Logic
Explanation:
Answer:
Logic. When interepreting scientific information you have to always use logic
Explanation:
How do scientists know how atoms are structured?
Explanation:
i guess it's through thousands of research and experiments they conducted
Cosider the sequence 2;5;8
1. 1 prove that none of the terms of the sequence are perfect squares
What is the relationship between the way in which radiant energy travels and how it is absorbed by different materials?.
what are genetics in scientific form?
Answer:
Genetics is the scientific study of genes and heredity.
Explanation:
which of the following does not conduct electricity easily
1. silver
2. plastic
3. copper
4. salt water
Answer:
NaCl (common salt) is solid in state and solid ions or compounds don't conduct electricity. It needs to be either melted, molten or dissolved in a solution (i.e. water) first.
Explanation:
What do we need to know to convert SI units for any measurement?
Answer:
Knowing the units of measurement that correspond with a number can give you so much more information than a digit sitting there by itself. Units can: Help to show another person the exact amount you have.
Explanation:
True or false. Singing sounds better in large rooms.
A) False
B) True
Answer:
it's true
Explanation:
Many of the factors affecting sound quality involve how sound waves bounce around the room. The more walls, the greater chance of longer reverberation. ... Ceiling height, room width, and the number of walls all contribute to determining reverberation time. Usually the larger the room, the longer the reverb time
URGENT!! 20 Points Please Help!! WIll mark brainliest!! My assignment is due in 10 minutes!!
3.) Make the following conversions:
a.) 157cs to seconds
b.) 42.7L to milliliters
c.) 261nm to millimeters
d.) 0.065km to decimeters
e.) 642cg to kilograms
f.) 8.25 × [tex]10^{2}[/tex]cg to nanograms
Answer:
a: 157cs = 1.57s
b: 42.7L = 42,700mL
c: 261nm = 0.000261mm
d: 0.0065km = 65dm
e: 642cg = 0.0064km
f: 8.25 x 10^2cg = 8,250,000,000ng
Answer:
a) 1.57
b) 42,700
c) 0.000261
d) 650
e) 0.00642
cant figure out f
Explanation:
What describes the energy an object has because of its motion
Answer:
Kinetic Energy
Explanation:
The energy an object has due to its motion is called kinetic energy.
How many moles of ammonium nitrate are in 335 mL of 0.425 M NH4NO3?
Answer:
0.142
Explanation:
Answer:
0.142 moles.
You would have to convert the algorithm to a broken down version of the compound.
NH4NO3(aq] → NH+4(aq] + NO−3(aq]
The ammonium is removed for this case, concentration gets broken down to zero.
So here, if 1 liter is equal to 10 x 10 x 10 milliliters...
use the formula of n and c to help you figure out the moles.
C is equal to N divided by V, so in that case...
N equals C times V.
C times V is 0.425, or 17 over 40 in simplest form.
From there, multiply 17 over 40 by the current moles, cross out the liters, and multiply by 335, then, 10 to the power of -3. You have to flip it to negative, because it will cancel out either way. Change the equation by the liters, and you have 0.125
Hence, your correct answer is 0.125
Which statement best describes the role of the respiratory system?
5 points
O collects waste produced by cells and removes it from the body
it breaks down food, absorbs nutrients, and gets rid of solid waste
brings oxygen into the lungs and releases carbon dioxide and water (waste materials)
from the body.
the body's transportation system
Answer:
Brings oxygen into the lungs and releases carbon dioxide and water ( waste materials) from the body ...is Answer of your question.
Thank you ☺️☺️
The molar mass of nitrogen (n2) is 28.02 g/mol. what is the mass, in grams, of 4.60 mol of n2? 0.164 grams 6.09 grams 23.4 grams 129 grams
The mass in grams of 4.60 mol of nitrogen is 129g.
How we calculate mass from moles?Mass of any substance will be calculated by using their moles as:
n = W/M, where
W = required mass
M = molar mass
Given molar mass of nitrogen (N₂) = 28.02 g/mol
Given moles of nitrogen (N₂) = 4.60 mole
On putting these values on the above equation and calculated for W, we get
W = (4.60 mol)(28.02 g/mol)
W = 128.89g = 129g
Hence the required mass is 129g.
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Answer:
D
Explanation:
The Theory of Continental Drift says that the continents were once joined together and are drifting apart. Who is given credit for coming up with this theory? Question 5 options: Charles Darwin Alfred Wegener Marie Curie Alfred Wallace.
The Theory of Continental Drift says that the continents were once joined together and are drifting apart, Alfred Wegener is given credit for coming up with this theory.
What is continental drift?Continental drift is a kind of illusion in which it looks like that continents changes their places over the surface of the earth. The Theory of Continental Drift was given by Alfred Wegener, it is a hypothesis and according to this theory the continents will move with respect to the geological time relative to each other. And due to their movement on the non planar or dynamic geographical base it looks like a drift.
Hence, option (2) is correct i.e. Alfred Wegener gave this theory.
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Answer:
a
Explanation:
what are the biggest cause of climatic variations
Answer:
As greenhouse gas emissions blanket the Earth, they trap the sun’s heat. This leads to global warming and climate change. The world is now warming faster than at any point in recorded history.
Explanation:
;)
Generating power, Manufacturing goods, and deforestation
Explain Why a change in the state of matter is a physical change
Answer:
Cuz they are reversible changes that do not change matter's chemical makeup or chemical properties. Processes involved in changes of state include melting, freezing, sublimation, deposition, condensation, and evaporation.
Explanation:
Write the correct word equation for the following:
H2 (g) + NO (g) àH2O (l) + N2 (g)
Answer:" For example, when hydrogen gas, H2(g), is burned in the presence of gaseous oxygen, O2(g), a new substance, liquid water, H2O(l ), forms. The covalent bonds within the H2 molecules and O2 molecules break, and new covalent bonds form between oxygen atoms and hydrogen atoms (Figure 7.1)."
Explanation:
PLSSS HELP Which reaction is endothermic? *
2 points
HCl + NaOH → NaCl + H₂O + 58 kJ
2Na + Cl₂ → 2NaCl + energy
6CO₂ + 12H₂O + energy → C₆H₁₂O₆ + 6O₂ + 6H₂O
The last one is endothermic, as you can notice we are using up energy (absorbing energy) in order for the reaction to occur.
Whereas the other ones release energy, as they are considered exothermic.
4.
A container holds 500 mL of Co, at 742 torr. What will be the volume of the Co, if the
pressure is increased to 795 torr?
GIVEN
WORK
Answer:
V2 = 0.465
Explanation:
To solve this question, we need to follow the equation below:
P1V1 = P2V2
We know that:
V1 = 500ml = 0.5L (must be convert to L)
P1 = 742 torr (must be convert to atm by divided by 760) = 0.976 atm
P2 = 795 torr = 1.05 atm
V2 = ?
P1V1 = P2V2
0.976 x 0.5 = 1.05 x V2
0.488 = 1.05 x V2
(Divided by side by 1.05 to get rid of it)
V2 = 0.465
Explain why leaf-cutter ants gather pieces of leaves and store them in their nests when they do not eat leaves.
Answer:
Sample response: Leaf-cutter ants gather pieces of leaves and store them in their nests to provide raw materials and food for the fungus that grows on the leaf pieces. The ants feed on the fungus, so by collecting leaves the ants are effectively able to grow their own food supply.
Explanation:
Answer:
Leaf-cutter ants gather pieces of leaves and store them in their nests to provide raw materials and food for the fungus that grows on the leaf pieces. The ants feed on the fungus, so by collecting leaves the ants are effectively able to grow their own food supply.
Explanation:
edg 2020
Wich has more energy rolling down a hill - a bowling ball or soccer ball? Explain your answer
Answer:
Bowling ball
Explanation:
They are traveling at the same speed, but the bowling ball has more mass. The bowling ball has more kinetic energy because more force is needed to stop the rolling bowling ball. Two balls with different masses moving at the same speed have different amounts of kinetic energy.
Answer:
Explanation:
As a ball rolls downhill, its potential energy from its height is converted into kinetic energy of its motion. Potential energy is given by mass x gravity x height. So for the same height, a ball with higher mass will have more energy. A bowling ball is heavier than a soccer ball and will have more energy.
What is different between an ionic bond and a covalent bond?
A An ionic bond is a bond between charged atoms, while a covalent bond is a bond between opposite charges.
B An covalent bond is a bond between charged atoms, while an ionic bond is a bond between neutral atoms.
C An ionic bond is a bond between charged atoms, while a covalent bond is a bond between neutral atoms.
D An ionic bond shares electrons, while a covalent bond is an attraction between opposite charges.
Answer:
Explanation:
Ionic bonds result from transfer of electrons, whereas covalent bonds are formed by sharing. 2. Ionic bonds are electrostatic in nature, resulting from that attraction of positive and negative ions that result from the electron transfer process; charge separation between covalently bonded atoms is less extreme.
Vocabulary-what is a fossil
20. A substance with a high volatility A. has a high boiling point. B. tends to stay in the liquid or solid phase. C. readily evaporates. D. can never be a liquid.
According to this question, a substance with a high volatility readily evaporates.
What is volatility?Volatility is the characteristics of a material which describes how readily the material undergo vaporization.
Volatile substances readily change phase from solid or liquid to gases via the process of vaporization.
Therefore, according to this question, a substance with a high volatility readily evaporates.
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