Which equation obeys the law of conservation of mass? h2(g) o2(g) → h2o(g) h2(g) o2(g) → h2o(g) 4he(g) 2h2(g) o2(g) → 2h2o(g) h2(g) → h2o(g) h2(g) o2(g) → 2h2o(g)

Marie Curie is credited with the discovery of radium. In 1898, she and her husband Pierre Curie discovered the element while experimenting with pitchblende, an ore containing uranium. They isolated a new substance, which they named radium, after the Latin word for ray.

Uranium is a naturally occurring element that is found in rocks and soil. It is a dense, silvery-white metal that has the highest atomic weight of all elements. Uranium is slightly radioactive and produces energy when it undergoes nuclear fission. It is an important source of energy generation and is used in nuclear reactors to produce electricity. Uranium also has a variety of other uses, such as in military applications, medical imaging, and industrial processes. It is a nonrenewable resource, and its supply is limited. Due to its radioactive nature, uranium must be handled with caution and special safety precautions must be taken to protect against the radiation it

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Answer: its D-  Marie Curie

Explanation: I got it right on the test! hope this helps :)

There is one sigma as well as one pi bond in a double bond.

Sigma bonds and pi bonds are the two types of covalent bonds. Sigma bonds are formed when there is an end-to-end overlapping of the atomic orbitals. A pi bond is formed when there is a lateral or a side-by-side overlapping of the atomic orbitals.

The sigma bonds are represented by a "σ" symbol and pi bonds are represented by "π" symbol. One sigma bond is there in a single bond. A double bond contains one sigma as well as one pi bond. A triple bond has one sigma as well as two pi bonds.

--The given question is incomplete, the complete question is

"List the number of sigma bonds and pi bonds in a double bond. Group of answer choices 2 sigma, 0 pi 1 sigma, 2 pi 1 sigma, 1 pi 2 sigma, 3pi, 1pi 1 sigma."--

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Answer:

False

Explanation:

They do cause harm.

A chemist reported that 100 gallons of a gas were available in a laboratory, The property of the gas did the chemist report is volume option - D is correct answer.

The space occupied by a three-dimensional object is measured using the scalar quantity known as volume. The volume of a liquid or gas is calculated using the container's capacity as the unit of measurement.

A state of matter known as gas lacks a consistent shape and a set volume. They are the least dense and have the most space between their moles.

A gallon is a unit of volume that is used in the American metric system. The volume of gas equals the sum of the moles of gas in the container, which contains 100 gallons of gas.

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Answer:

1. carbon

Explanation:

carbon atoms bound to one another and other atoms by covalent bonds and found in the cells of living organisms. Hydrogen, oxygen and nitrogen are typical elements which, in addition to carbon, make up organic compounds.

Answer:

the moles of mercury are nHg = 65/201

HgO --------> Hg + 1/2O2

65/201 65/201

=> the moles of HgO are 65/201 mol

A certain solution contains 4.3 grams of salt per liter. the  salt is there in 11 liters of the solution is 47.3 grams.

The solution contains = 4.3 grams salt per liters

in one liters the solution contains = 4.3 grams of the salt.

the salt in the 11 liters = ?

so, in one liter in contains = 4.3 grams

in 11 liters it will contains = 4.3 × 11

                                         = 47.3 g

the round off answer to the solution is 47.3 g.

Thus the amount of the salt in the 11 Liters of the solution is the 47.3 g.

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Answer:

Hello There!!

Explanation:

The answer is C: evaporation because evaporation is the process in which a liquid boils then evaporates and lastly becomes a gas.

hope this helps,have a great day!!

~Pinky~

According to the forces of attraction, when you boil a pot of liquid water, the water turns to steam and rises in the air. This is an example of evaporation.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Answer:

40.15 g/mol

Explanation:

The molar mass of c2h16 is

40.1484 g/mol ≈ 40.15 g/mol (rounded to 4 significant figures)

[tex]NH_{4} Br[/tex](aq ) is expected to have a Ph less than 7 as on dissociation the following constituents will separate

[tex]NH_{4} Br[/tex]    +  [tex]H_{2}O[/tex]    → [tex]NH_{4} OH[/tex](weak base)    +   [tex]HBr[/tex] (strong acid)

A weak base is a strong acid hence B is  correct

[tex]LiNO_{3}[/tex] It is a salt of a strong base and weak acid hence basic  and a PH greater than 7

[tex]MgCl_{2}[/tex]it is a salt of a strong base and strong acid hence a neutral solution of PH 7

[tex]RbCH_{2} H_{3} O_{2}[/tex] It is a salt of a strong base and weak acid hence basic  and a PH greater than 7

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The amount of hydrogen monochloride that is produced at STP is 152 mL.

The balanced chemical reaction can be depicted as follows:

H₂ + Cl₂ -----> 2 HCl

According to stoichiometry, When one mole of hydrogen reacts with one mole of chlorine, it yields two moles of hydrogen monochloride. Stoichiometry defines the relationship between the quantities of reactants and products before, during, and following chemical reactions

If, 2 g of Hydrogen reacts with 71 g of chlorine to form 73 g of Hydrogen Chloride.

Therefore,  if 10 g reacts with 142 g of chlorine, the HCl produced will be 152 g or 152 ml of HCl.

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The statement, that describes the characteristic of a strong acid is "it completely dissociates in water."

What is a strong acid?

In aqueous solution, strong acids and bases are completely ionised.

A strong acid is one that entirely ionises in solution. When dissolved in water, it emits the maximum number of hydrogen ions or protons, implying that it always loses a proton (H+).

As a result, it is possible to deduce that a strong acid (HA) entirely dissociates in solution.

Hence the correct option is B.

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Answer:

Sjjejwhsshw

Explanation:

Sssskeo1jshi1bdi kwn ieni, nei, nei nei nei neox3nixnec

A tiny amount of weak hydrochloric acid is mixed with a quantity of marble chips (CaCO3), to decrease the rate of reaction we do decreasing the surface area of the marble chips, decreasing conc. HCL and many more.

Several ways are:-

1. Decreasing the surface area of the marble chips: By breaking the marble chips into smaller pieces, the surface area that is available for the acid to react with is reduced, slowing down the reaction.

2. Decreasing the concentration of the hydrochloric acid: By using a less concentrated solution of hydrochloric acid, the number of acid molecules available to react with the marble chips is reduced, slowing down the reaction.

3. Increasing the temperature: By performing the reaction at a lower temperature, the kinetic energy of the acid and marble chip molecules is reduced, slowing down the rate of collision between them, which slows down the reaction.

4. Using a catalyst: Addition of a catalyst to the reaction can change the reaction mechanism and decrease the activation energy needed for the reaction to occur, thus slowing down the reaction.

5. Using an inhibitor: An inhibitor is a substance that slows down the reaction by binding to the enzyme or catalytic site and preventing the substrate from binding.

It's important to note that these methods may also affect the overall yield of the reaction, so it's essential to use the appropriate method(s) for the specific experiment and goals.

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Answer:

metal - metal

metal - metal

metal - polyatomic

metal - polyatomic

metal - nonmetal

metal - nonmetal

Answer:

Explanation:

In the reaction, NH4HS(s)⇌NH3(g)+H2S(g), more of the solid will form.

In a chemical reaction, equilibrium is the state where both the reactants and products are present in concentrations which have no further tendency to change with time, so there is also no observable change in the properties of the system. This state results when forward reaction proceeds at the same rate as reverse reaction.

If Q= K then equilibrium

Q>k, then reversed direction shift

Q<k, then forward direction shift

Given, Kc=8.5×10−3

Given [NH3]=0.166  and M [H2S]=0.166 M

Here Q= 0.166 M (given)

It shows Q> k that is 0.166 > 8.5×10−3

Therefore, more of the solid will form.

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The water solution gets hotter when an ionic solid dissolves in it. Entropy increases and there is a decrease in enthalpy change.

The spread of the solute molecules (and the thermal energy they carry) through the larger volume of the solvent during the dissolution of a solute typically results in a rise in entropy. When a liquid or solid dissolves in a solvent, entropy typically rises. Less negative entropy change is occurring (or perhaps even at this stage, positive). The chemicals will likely become more soluble as a result. The total result is a delicate balancing act between how the solution's enthalpy changes and how its entropy changes. When a substance is divided into several pieces, entropy rises. Entropy is raised via the disintegration process.

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Answer:

i) Iron metal is obtained

ii) Fe2O3 + 3CO → 2Fe + 3CO2

iii) CO is the reducing agent

Explanation:

i) When carbon monoxide is passed over iron III oxide, iron metal is obtained

ii) The equation of the reaction is;

Fe2O3 + 3CO → 2Fe + 3CO2

iii) The reaction is a redox reaction. CO acts as the reducing agent while Fe2O3 acts as the oxidizing agent. We know that CO is the reducing agent because its oxidation number increased from left to right. Recall that the oxidation number of the reducing agent increases from left to right in a redox reaction

A furnace has an advantage over a flame in atomic absorption because it is more sensitive due to the lengthier time the atomized material remains in the optical path.

Absorption in chemistry is the process by which a material that is already present in one state gets assimilated into another substance that is already present in another state (e.g., gases being absorbed by a liquid or liquids being absorbed by a solid).

Absorption and adsorption have quite different definitions. A liquid can be absorbed by a substance like a sponge, cloth, or filter paper. The absorbent substance absorbs all of the liquid. Adsorption describes the accumulation of single molecules, atoms, or ions on surfaces.

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Answer:

  2

Explanation:

You want the coefficient of silver iodide in the equation ...

  _AgI +_Na₂S ⇒ _Ag₂S +_NaI

The equation is balanced when the numbers of each of the species is the same on each side of the equation.

We can write four equations in the four unknowns to find the coefficients, or we can use a little guesswork.

If we suppose the coefficient of silver sulfide (Ag₂S) is 1, that tells us the coefficient of silver iodide (AgI) will be 2. If that is the case, then there are two atoms of iodine that will make the coefficient of NaI be 2. This is consistent with the coefficient of Na₂S being 1, giving one Sulfur atom on each side of the equation.

The balanced equation is ...

  2AgI +Na₂S ⇒ Ag₂S +2NaI

The coefficient of silver iodide is 2.

__

Additional comment

If the reaction is ...

  a·AgI + b·Na₂S ⇒ c·Ag₂S + d·NaI

We can write the relationships between the coefficients as follows. This ultimately gives rise to 3 equations in 4 unknowns, so the choice of any given coefficient is arbitrary. We choose to use the smallest integers that satisfy the conditions.

The balance for Ag is ...

  a = 2c

The balance for I is ...

  a = d

The balance for Na is ...

  2b = d

The balance for S is ...

  b = c

Then, in terms of 'a' and 'b', we have ...

  a = d = 2b = 2c

For b = c = 1, a = d = 2, as we determined above.

The reaction that has been shown in the table above is a double replacement reaction, and each compound has the same set of ions. Option D

Another word that we can use for reaction is what we call a chemical change. We know that a chemical change is the kind of change that will lead to the formation of a new product. It is an irreversible process as we can not be able to get back the reactants again.

We should note that there are various types of reactions. In a single  replacement reaction, you would notice that there is only one substance that reacts and causes a change while in the double replacement reaction, the anions that are in the compounds that underwent the reaction would just exchange anion partners and we would have two ionic products.

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Answer:

0.049 g of Ag

Explanation:

From the question;

Ag^+ (aq) + e ----->Ag(s)

1 e = 96500 C

Note that Q= It

Where;

I = current and t= time taken

108 g of silver is deposited by 96500 C of electricity

x g is deposited by (0.49 * 90) C

x = 108 * (0.49 * 90) /96500

x= 0.049 g of Ag

When ocean water that is more dense (colder or saltier) is mixed with water that is less dense (warmer or less salty), the denser water will sink to the bottom and the less dense water will rise to the top. This is known as stratification, and it helps to create distinct layers in the ocean.

This stratification can create an environment that is more conducive to life, as it allows different types of organisms to inhabit different layers of the ocean.

The different layers of the ocean created by stratification play a significant role in the global climate system. Colder, denser waters are usually found at the bottom of the ocean, while warmer, less dense waters are found near the surface.

This temperature difference creates a natural convection system that drives currents throughout the ocean, which helps to regulate temperatures on a global scale. Additionally, stratification can also affect the amount of oxygen in the ocean.

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A chemical reaction reaches equilibrium when the rate of the forward reaction is equal to the rate of the reverse reaction, resulting in no net change in the concentrations of the reactants and products.

A scientist observing a chemical reaction can tell if the reaction has achieved equilibrium by monitoring the following: Concentration of reactants and products: The concentrations of reactants and products should no longer change over time if the reaction has reached equilibrium. Temperature: If the reaction has reached equilibrium, the temperature of the system should remain constant. Pressure: If the reaction is taking place in a closed container, the pressure of the system should also remain constant if the reaction has reached equilibrium. It's worth noting that the equilibrium is a dynamic process, meaning that the concentrations of reactants and products will remain constant over time, but the chemical reaction is still taking place.

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Answer: Scientific notation- [tex]1.51 x 10^{-1}[/tex]

Explanation: I got this by moving the decimal, so that there is one non-zero digit to the left of that decimal point. Tip- The number of decimal places you move will be the exponent on the 10.

Moved right- Negative

Moved left- Positive

The space left by the free electron in an atom after it has lost one electron is known as a hole.

The term "free electron" refers to an electron that has broken loose from its "parent" atom and is now free to move about the material at random. A vacancy, also known as a hole, is created in the atom when a bonded electron in a lattice atom breaks free. The number of electrons in an atom's valence shell, or n shell in this example, has a significant impact on the electrical properties of the element that the atom represents. The least force of attraction is felt by the electrons in the valence shell since they are the furthest from their nucleus.

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Answer:

Amoeba has no special respiratory organs and no respiratory pigments but there is a free exchange of gases by diffusion through the general body surface which is permeable to the gases dissolved in water

The argument that supports the claim that dissolving solid calcium chloride (CaCl2) in water is a chemical change is A. The ionic bond among calcium and chloride ions has been broken..

When solid calcium chloride is added to water, the ionic bonds between the calcium ions (Ca2+) and chloride ions (Cl-) are broken apart by the polar water molecules. The calcium ions and chloride ions are then surrounded by the water molecules, forming a new chemical compound called calcium chloride hydrate (CaCl2*xH2O) which is different from the original solid calcium chloride. This process is a chemical change because it creates new substances and the original chemical bonds are broken and new bonds are formed.

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the complete question is:

Which of the following arguments supports the claim that dissolving calcium chloride (CaCl2) in water results in a chemical change?

A. The ionic bond among calcium and chloride ions has been broken.

B. By evaporating the water, the solid calcium chloride can be recovered.

C. The ions found in the solid remain in the solution and have not changed.

D. Ions are attracted by the polar water molecules.

Answer:

m=175

Explanation:

100/16 = 6.25

6.25x28 = 175

Answer: To solve this equation for m, you can divide both sides of the equation by 0.16. This will give you:

m = 28 / 0.16

Simplifying the right side of the equation gives:

m = 175

Therefore, m = 175.

Explanation: