Two chemical reactions are shown:
A. Ca(OH)2 - CaO + H2O
B. 4K + O2 + 2K20
Which statement is true?

A. Both are synthesis reactions
B. Both are decomposition reactions
C. A is a synthesis reaction, and B is a decomposition reaction
D. A is a decomposition reaction, and B is a synthesis reaction

Answer:

No it is not a good conductor

Explanation:

Krypton is classified as a gas and nonmetal. Like many nonmetals and gases, krypton is an insulator, so it is a relatively poor conductor of heat and electricity.

Despite this problem misses out crucial information for its solution, it turned out possible to come up with the attached absorbance graph, which shows the behavior of the absorbance of the sample with respect to the concentration at 453 nm.

As you can see, there is a red line and circle pointing out the concentration at which the sample has an absorbance of 0.20 (y-axis) which turns out to be 4x10⁻⁵ M (x-axis).

Now, since we require the moles of the iron (III) ions present in 100. mL of the sample, we recall the concept of molarity, which requires moles and volume in liters:

[tex]M=\frac{n}{V}[/tex]

Thus, since all the Fe⁺² in FeSCN⁺² is converted to Fe⁺³ we can find out the moles as shown below:

[tex]n=4x10^{-5}\frac{mol}{L} *0.100L\\\\n=4x10^{-6}mol[/tex]

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Explanation:

So copper is a lattice of positive copper ions with free electrons moving between them. 

Answer:

The actinides and the lanthanides

This problem is providing information about the initial mass of mercury (II) oxide (10.00 g) which is able to produce liquid mercury (8.00 g) and gaseous oxygen and asks for the resulting mass of the latter, which turns out to be 0.65 g after doing the corresponding calculations.

Initially, it is given a mass of 10.00 g of the oxide and 1.35 g are left which means that the following mass is consumed:

[tex]m_{HgO}^{consumed}=10.00g-1.35 g=8.65 g[/tex]

Now, since 8.00 grams of liquid mercury are collected, it is possible to calculate the grams of oxygen that were produced, by considering the law of conservation of mass, which states that the mass of the products equal that of the reactants as it is nor destroyed nor created. In such a way, the mass of oxygen turns out to be:

[tex]m_{O_2}=8.65g-8.00g=0.65g[/tex]

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Answer:

Sound Travels

Explanation:

Sound waves can travel, and that makes it so that even though Marco is in a different room, he can hear the music. Depending how loud the music is and how thick the walls car, the sound can travel through the walls.

Answer:

true

Explanation:

hope this helps

Answer:

Na2SO4

2×23 + 32 + 4×16

46 + 32 +64

=142g

the answer is B. 2

because there is 2 iron on the right side so you need another two on the left side to balance it out

the answer isssssssssssssssssssssss... Nh3.

Answer: A.) NH3

Explanation:

Answer:

5540

Explanation:

Answer:

5,440

Explanation:

10 deciseconds = 1 seconds

554 seconds = 5,440 seconds

THE MOLECULE HAS A C=C AND AN -OH GROUP, SO IT IS CALLED AN ENE/OL, I.E., AN ENOL. ENOLS CAN BE FORMED ONLY FROM CARBONYL COMPOUNDS WHICH HAVE ALPHA HYDROGENS. THEY CAN BE FORMED BY ACID OR BASE CATALYSIS, AND ONCE FORMED ARE HIGHLY REACTIVE TOWARD ELECTROPHILES, LIKE BROMINE.

Answer:

its obviously a chemical change

Explanation: Facts

The addition of the food color in water only causes the change in the cor of water but no new substance is formed. Therefore, the teacher is restarting the physical change.

A physical change can occur when the characteristics of the matter change but the identity does not. Physical changes are classified as: reversible and irreversible. For example, the melting of water is reversible in nature since the melted ice cube will be refrozen.

Physical change can be described as a kind of change where only physical properties of matter such as odor, color, solubility, etc. can change. During physical changes, there is no chemical bonds are broken or formed between atoms of the substance.

The chemical composition as well as the chemical nature of the substance remains unchanged during a physical change.  The molecules of matter can rearrange without changing the internal composition of matter.

Therefore, adding food color to water is a physical change as no new substance formed.

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Answer:

see answer

Explanation:

DO the postulates of Daltons atomic theory explain the law of conservation of mass and the law of constant composition.

1. Everything is composed of atoms, which are the indivisible building blocks of matter and cannot be destroyed or divided any further.

2. All atoms of a single pure element are the same in size and mass

3. Atoms of different elements vary from each other in size and mass.

4. Compounds are produced through different simple whole-number combinations of atoms to produce molecules.  

5. Anywhere a compound exists, it will have the same atoms in the same ratio.

6. A chemical reaction between compounds is a re-arrangement of atoms

The law of conservation of mass is shown in 2, 4. and 5.

The law of constant co,position is shown in 2, 4, 5, and 6

Answer:

the anwser is landforms can be created by erosion

Explanation:

Answer:

the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D)

Explanation:

Answer:In a metal, atoms readily lose electrons to form positive ions (cations). These ions are surrounded by delocalized electrons, which are responsible for conductivity.

Explanation:

Due to the structure of ionic compounds, in a crystal of an ionic compound, each cation is surrounded by a number of oppositely-charged anions.

Ionic compounds are compounds that are composed of oppositely charged ions held together by strong electrostatic forces of attraction.

The ions present in an ionic compound are the positively-charged ions known as cations and the negatively-charged ions known as anions.

Each of the oppositely-charged ions are attracted to each other.

Therefore, in a crystal of an ionic compound, each cation is surrounded by a number of oppositely-charged anions.

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Answer:

Cl < P < Mg < Na

Explanation:

Cl must have the smallest radius because it is located to the right of the remaining elements on the same row. P  must have the second smallest radius because it is located to the right of the remaining elements on the same  row. Mg must have the Third smallest radius because it is located to the right of Na on the same row.  Therefore, Na has the Largest radius.

I hope it helps.

Answer:

Metamorphic rocks started out as some other type of rock, but have been substantially changed from their original igneous, sedimentary, or earlier metamorphic form. Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors.

Explanation:

The final pressure in the heated can is 2.51 atm

From the question given above, the following data were obtained:

Initial temperature (T₁) = 25 °C = 25 + 273 = 298 K

Initial pressure (P₁) = 1 atm

Final temperature (T₂) = 475 °C = 475 + 273 = 748 K

The final pressure can be obtained as illustrated below:

[tex] \frac{P_1}{T_1} = \frac{P_2}{T_2} \\ \\ \frac{1}{298} = \frac{P_2}{748} \\ \\ cross \: multiply \\ \\ 298 \times P_2 = 1 \times 748 \\ \\ divide \: both \: side \: by \: 298 \\ \\ P_2 = \frac{748}{298} \\ \\ P_2 = 2.51 \: atm[/tex]

Therefore, the final pressure in the heated can is 2.51 atm

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Answer:3.39

Explanation:

the answer is using rollers in conjunction with inclined plane.

Maximum number of electrons in nth energy level

[tex]\\ \sf\longmapsto 2n^2[/tex]

Now

Max electrons

[tex]\\ \sf\longmapsto 2(1)^2[/tex]

[tex]\\ \sf\longmapsto 2e^-[/tex]

Answer:

2

Explanation:

energy produced in nuclear fusion or even fission is due to mass defect and it can be calculated by Einstein equation e=mc2

The statement, that describes energy released by a nuclear fusion reaction is produced is "mass is converted to energy."

Nuclear fusion is the process by which two light atomic nuclei merge to produce a single heavier one, releasing huge quantities of energy in the process.

A fusion reaction occurs when two light nuclei combine to form a single heavy nucleus. Because the overall mass of the resulting single nucleus is smaller than the mass of the two initial nuclei, the process releases energy.

That is, nuclear energy refers to the energy released as a result of mass loss during the nuclear fusion processes. Both of these processes transform mass loss into energy in accordance with Einstein's mass-energy ratio, E = [tex]mc^{2}[/tex]. As a result of the fusion reaction, mass is destroyed and energy is released.

Hence, the correct answer is 2.

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Can you please add a picture of the case??

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Metals have tendency to loose electrons in order to get noble gas configuration, therefore they loose electrons to form Cations (positively charged ions)

for example ~ Sodium forms Na+

And

Non - metals have tendency to gain electrons in order to attain noble gas configuration , hence they gain electron from somewhere and bears a negative charge forming Anion.

for example ~ Chlorine forms Cl-

Answer:

(C) Both of these

Explanation:

A beam of electrons has both of these Wave properties and Particle properties.