Conservative mass states that the sum of the mass of the products produced must be equal to that of the reactants. The combined mass is less as the gas was evolved.
What is the conservation of mass?The law of mass conservation is about the conservation of the energy and the mass of the chemical involved in the reaction. It states that the combined mass of the products of the reaction is always conserved to that of the chemical reactants.
The mass of the reaction was reduced compared to the mass of the reactants as during the acidification of the zinc strip hydrogen gas bubbles were released that had some of the mass.
Therefore, the formation of the gas depicts that the gas had some of the mass that escaped in the atmosphere.
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Final answer:
The conservation of mass principle dictates that the total mass of the products equals the total mass of the reactants in a chemical reaction. The observed mass loss in the student's experiment is due to the unmeasured hydrogen gas produced, not a violation of mass conservation. Balancing chemical equations reflects this law of conservation.
Explanation:
The experiment involving the reaction between zinc and hydrochloric acid showcases the law of conservation of mass. Despite the observation that the combined mass appears to be less after the reaction, it is likely due to the gas produced (hydrogen gas in this case) escaping the system, which was not taken into account when measuring the mass afterward. According to the law of conservation of mass, the total mass of the products in a chemical reaction must equal the total mass of the reactants. The missing mass corresponds to the hydrogen gas that was not captured or measured after the reaction.
Furthermore, although there is a transfer of energy and the resulting substances may have different physical and chemical properties, this does not affect the mass conservation principle. For instance, when magnesium metal reacts with oxygen to form magnesium oxide in a sealed vessel, the total mass remains unchanged before and after the reaction, demonstrating the conservation of mass.
It is crucial in chemistry to ensure that chemical equations are balanced, as this reflects the conservation of matter, where the number of atoms of each element in the reactants equals the number of atoms of each element in the products.
When a neat, ordered chemical is changed into a more disordered chemical, there is an increase in what?
How do you determine whether a molecule is polar? select all that apply. select all that apply. determine whether the polar bonds add together to form a net dipole moment. determine if the bonds are ionic or covalent. draw the lewis structure for the molecule and determine the molecular geometry. determine whether the molecule contains polar bonds?
To determine if a molecule is polar, ascertain if it contains polar bonds, draw the Lewis structure to visualize molecular geometry, and confirm if the polar bonds sum up to a net dipole moment. Molecules with a net dipole moment are polar. Geometry of the molecule also plays a key role; polar molecules can turn nonpolar if the geometry causes bond dipoles to cancel each other out.
Explanation:There are a few steps to determine whether a molecule is polar. Firstly, it is important to determine whether the molecule contains polar bonds, which include ions and atoms with differing electronegativities resulting in a bond dipole moment. A polar bond has a partially positive charge on one atom and a partially negative charge on the other.
Drawing the Lewis structure for the molecule can help to visualize the molecular geometry. According to VSEPR theory, a molecule can be nonpolar if its geometry is structured in a way that the bond dipoles cancel each other out, such as in the case of CO₂ which is linear in shape. The opposite side bonds, even though polar, cancel each other out due to their antiparallel arrangement, making the molecule nonpolar. Nevertheless, in contrast, H2O has a bent shape due to lone pairs on the Oxygen atom, leading to an overall dipole moment therefore making the molecule polar.
Lastly, if polar bonds in the molecule add up to form a net dipole moment, the molecule is polar. The dipole moment measures the extent of net charge separation in the molecule and is calculated by summing the bond moments in three-dimensional space.
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What is the atomic nucleus made of ?
only neutrons
electrons
only protons
nucleons
The atomic nucleus is made of Nucleons
Identify which statement describes the following process. 2Ce + 3Cu2+ → 3Cu + 2Ce3+
A-Ce is oxidized because it is losing electrons and Cu is reduced because it is gaining electrons.
B-Ce is oxidized because it is losing electrons and Cu is reduced because it is losing electrons.
C-Ce is reduced because it is losing electrons and Cu is oxidized because it is gaining electrons.
D-Ce is reduced because it is gaining electrons and Cu is oxidized because it is losing electrons.
The correct statement describing the process is A. Ce is oxidized because it is losing electrons and Cu is reduced because it is gaining electrons.
To understand the oxidation and reduction processes in the given chemical reaction, we need to look at the changes in the oxidation states of the elements involved:
The reaction is:
[tex]\[ 2\text{Ce} + 3\text{Cu}^{2+} \rightarrow 3\text{Cu} + 2\text{Ce}^{3+} \][/tex]
For cerium (Ce), it starts with an oxidation state of 0 (since it is an elemental form) and ends up as Ce³⁺ , which means its oxidation state has increased from 0 to +3. An increase in oxidation state indicates that the element has lost electrons, which is the definition of oxidation. Therefore, Ce is oxidized. For copper (Cu), it starts with an oxidation state of +2 (since it is in the form of Cu²⁺ ions) and ends up as elemental copper with an oxidation state of 0. A decrease in oxidation state indicates that the element has gained electrons, which is the definition of reduction. Therefore, Cu is reduced. The correct description of the process is that Ce is oxidized because it loses electrons, and Cu is reduced because it gains electrons, which corresponds to option A. The other options contain incorrect descriptions of the oxidation and reduction processes for Ce and Cu.What is the molarity of a solution containing 8.0 grams of solute in 0.50kg of solvent?
Answer:
0.67m
Explanation:
How many nad+ are reduced in the β-oxidation of stearoyl-coa to form nine molecules of acetyl-coa?
If the volume of a container of gas is reduced, what will happen to the pressure inside the container?
a. The pressure will increase.
b. The pressure will not change.
c. The pressure will decrease.
d. The pressure depends on the type of gas.
Answer: a. The pressure will increase.
Explanation:
Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.
[tex]P\propto \frac{1}{V}[/tex] (At constant temperature and number of moles)
[tex]{P_1V_1}={P_2V_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas
[tex]P_2[/tex] = final pressure of gas
[tex]V_1[/tex] = initial volume of gas
[tex]V_2[/tex] = final volume of gas
Thus as volume of the container will be reduced, the pressure would increase.
Answer:
a. The pressure will increase.
Explanation:
A capital letter or a combination of a capital letter and a small letter that is used to represent an element is called ____
Does the nature of intermolecular forces change when a substance goes from a solid to a liquid or from liquid to gas?
Explain the effect of Earth’s gravity on objects on the surface of Earth.
The effect of Earth's gravity on objects on the surface of Earth is to pull them toward the center of the planet, creating a downward force known as weight.
Gravity is the force of attraction between two objects with mass, and it is directly proportional to the mass of the objects and inversely proportional to the square of the distance between them. On Earth's surface, all objects experience the gravitational pull of the planet, causing them to be pulled toward the center of the Earth.
The strength of this gravitational force depends on two factors: the mass of the Earth and the distance from the object to the center of the Earth. Earth's mass is constant, so the force of gravity primarily varies with an object's distance from the center of the planet. Objects closer to the Earth's surface experience a stronger gravitational force, while those at higher altitudes experience a weaker force.
This gravitational force gives objects weight, which is a measure of the force of gravity acting on them. Weight is commonly measured in units such as pounds or kilograms. When an object is at rest on the surface of the Earth, it experiences a gravitational force equal to its weight, which is directed toward the center of the Earth.
In summary, Earth's gravity exerts a downward force on objects on its surface, giving them weight and keeping them anchored to the planet. This force is responsible for objects falling when dropped, and it plays a fundamental role in the physics of everyday life.
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How many electrons are involved when two atoms in a molecule are connected by a "double bond"? write the lewis structure of a molecule containing a double bond?
In a double bond, four electrons are shared between two atoms.
When two atoms in a molecule are connected by a double bond, four electrons are involved. This is because a double bond consists of two pairs of electrons that are shared between the atoms. The Lewis structure of a molecule containing a double bond follows specific steps:
Determine the total number of valence electrons available for bonding.
Write a plausible skeletal structure for the molecule with the least electronegative atom typically in the center.
Arrange the electrons to satisfy the octet rule for each atom, which often means forming double or triple bonds to account for all electrons.
Count the number of regions of electron density (lone pairs and bonds) around the central atom. Remember, a single, double, or triple bond counts as one region of electron density.
Ensure the total number of electrons used (bonding plus non-bonding) is equal to the available valence electrons.
Let's consider the molecule of ethene (C2H4) as an example:
Two carbon (C) atoms contribute a total of 8 valence electrons (2 x 4 electrons).
Four hydrogen (H) atoms contribute a total of 4 valence electrons (4 x 1 electron).
The total number of valence electrons is 12.
The Lewis structure shows each carbon atom single-bonded to two hydrogen atoms and double-bonded to each other, with no lone pairs on the carbons, thus satisfying the octet rule.
If the strength of the magnetic field at B is 6 units, the strength of the magnetic field at A is _____.
file:///C:/AOP/SH2016Curric/AOP.COM.Science.09IPC.2015/IntegratedPhysicsandChemistry2015/9/magnetic_field_ex1.gif
The magnetic field strength at point A cannot be determined based solely on the strength at point B being 6 units. Factors such as distance from the magnet, the presence of ferromagnetic materials, and orientation relative to the magnetic lines of force could affect its strength.
Explanation:Unfortunately, there is missing information in your question. The strength of the magnetic field at point A cannot be determined, just with the strength at point B being 6 units. The magnetic field strength can vary depending on factors like the distance from the magnet, if any ferromagnetic materials are near, and the orientation relative to the magnetic lines of force. Without additional context or information, it's impossible to infer the magnetic field strength at point A accurately.
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( pls help me) brainlest answer too
4.) Heat is transferred through a piece of metal by _____.
conduction
convection
radiation
5.) Heat from the sun travels to earth by _____.
conduction
convection
radiation
6.) Energy in a vacuum travels by ___.
conduction
convection
radiation
7.) In a convection current _____.
A.) warm fluid sinks to replace cool fluid
B.)warm fluid is more dense, and therefore, rises
C.)cool fluid is more dense, and therefore, sinks
D.)heat flows from cooler areas to warmer areas
8.) Nuclear reactions occurring in the Sun _____. Select all that apply.
generate light
generate heat
absorb a lot of energy
fuse atoms of hydrogen to make helium atoms
9.) Which of the following statements is true?
A.) Temperature is an average measure of the heat energy in a substance.
B.)The transfer of heat in a fluid does not require physical contact between molecules.
C.)The sun's energy comes from the nuclear reactions of changing hydrogen into helium.
D.)All of the above.ω∵
The simplest structured unit of a compound is a(n):
a. electron
b. atom
c. proton
d. molecule
For the endothermic reaction below, when does le chatelier's principle predict that there will be an increase in the number of moles of co2? caco3(s) ⇄ cao(s) + co2(g)
Molecules of hydrogen escape from earth, but molecules of oxygen and nitrogen are held to the surface and remain in the atmosphere. explain.
Answer:
Hydrogen is a light molecule
Explanation:
The molecular weight of a gas determines its molecular speed. Hydrogen is a very light gas, far lighter than oxygen or nitrogen. These heavier gases cannot escape the earth because of their molecular weight but hydrogen does escape the earth surface because it is very light molecule having very high molecular speed.
Marine organisms that are well adapted to drastic changes in salinity would most likely be found in which environment?
a. Hydrothermal vent
b. Estuary
c. Open ocean
d. Deep ocean
K12 the answer is estuary
Hope this helps!
Which is responsible for the high thermal energy required to melt ice? (1 point)?
Will maynez burns a 0.8-g peanut beneath 76 g of water, which increases in temperature from 22âc to 46 âc. (the specific heat capacity of water is 1.0 cal/(gââc).)
The vapor pressure of water at 25.0 oc is 23.8 torr. determine the mass of glucose (molar mass = 180. g/mol) needed to add to 27.78 moles of water to make a solution that has a vapor pressure of 23.1 torr.
Of the choices below which one is not an ionic compound quizlwr
NC13 is a compound that is not an ionic compound.
Explanation:Of the compounds listed, the only one that is not an ionic compound is NC13. Ionic compounds are formed between a metal and a nonmetal, where electrons are transferred from the metal atom to the nonmetal atom. Covalent compounds, on the other hand, are formed between nonmetals, where electrons are shared between atoms. In this case, NC13 is covalent because it is composed of nitrogen (a nonmetal) and chlorine (also a nonmetal).
Three different sub-atomic particles are described below:
Particle X: Uncharged
Particle Y: Present outside the nucleus
Particle Z: Attracts Particle Y
Which statement is true?
X is a neutron, Y is an electron, and Z is a proton.
X is a neutron, Y is a proton, and Z is an electron.
X is a proton, Y is an electron, and Z is a neutron.
X is an electron, Y is a proton, and Z is a neutron.
Answer:
The first answer
Explanation:
Why? Because i got it right on my test.
I didn't copy of the other persons answer.
Why will oil and water never mix second law of thermodynamics?
Olympic athletes have lower resting heart rates because
What has research determined about the orbit of an electron around a nucleus
Answer:
Check explanation.
Explanation:
INTRODUCTION: Many researches has been done on atoms. One of them is the one done by Both. Bohr research in 1913 on atom made him to proposed the "Bohr Atomic Model''. With this model, Bohr was able to proposed his quantized shell model.
Bohr made modifications to the Model proposed by Rutherford to solve the stability problem.
RESEARCH PROGRESS: with Bohr research, he was able to explain that the angular momentum of electrons are quantized. He explained that electrons can have stable orbits around the nucleus.
Borh was also able to explain the emission and absorption of energy, when electrons jump from one orbit to another.
A solution containing more than the equilibrium amount is called ________
Imagine that you have isolated a mysterious liquid from a sample of food. you add the liquid to a beaker of water and shake vigorously. after a few minutes, the water and the other liquid separate into two layers. to which class of biological molecules does the unknown liquid most likely belong
Determine the percent yield for the reaction between 3.74 g of na and excess o2 if 5.34 g of na2o2 is recovered.
The percentage yield for the reaction is 84.2%.
What is percent yield?Percent yield is the difference in the percent of theoretical yield to the percent of actual yield.
The reaction is
[tex]\rm2Na + O_2 = Na_2O_2[/tex]
Mass of Na = 3.74g
Calculating the moles of Na
[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\\Number\;of \;moles= \dfrac{3.74}{23}= 0.162 \;mol[/tex]
The ratio of mole of Na : (Na₂O₂) = 2:1
[tex]\rm Number\;of \;moles= \dfrac{0.162}{2}= 0.081 \;mol\\\\mass\;of Na_2O_3 = 0.081 \times 78\;g/mol\\\\mass\;of Na_2O_3 = 6.341\;g\\\\\\Yield \;of\;reaction = \dfrac{5.34g}{6.341g} \times 100 = 84.2\%[/tex]
Thus, the percent yield is 84.2%.
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The oxygen gas produced in part a has a density of 1.43g/l.calculate the volume of of the o2 gas produced pg 76
What is the pH of blood, given the hydrogen ion concentration is 4.0 × 10-8M?
The pH of blood with a hydrogen ion concentration of 4.0 × 10⁻⁸ M, we use the formula pH = -log[H+]. This results in a pH of approximately 7.4, indicating that blood is slightly alkaline.
The pH of blood given the hydrogen ion concentration, use the formula: pH = -log[H+]
Given: [H+] = 4.0 × 10⁻⁸ M
Step-by-step calculation:
First, find the log of 4.0 × 10⁻⁸log(4.0 × 10-8) = log(4.0) + log(10⁻⁸)log(4.0) ≈ 0.6021log(10-8) = -8Therefore, log(4.0 × 10⁻⁸) ≈ 0.6021 - 8 = -7.3979So, the pH = -(-7.3979) = 7.3979
Conclusion: The pH of blood is approximately 7.4, which is slightly alkaline.