Percy finds a rock in his backyard. It looks like several pebbles cemented together. Percy has found _____.

Answer:

No

Explanation:

Most Sulfonamides are antibiotics that kill bacteria but not human cells.  They work by distrupting the production of dihydrofolic acid (form of folic acid that human/bacteria cells use for protein production).

Answer:

Option 3

[tex]MgCO_{3}[/tex]

Explanation:

These are the steps for empirical forumla

1) If given percentage, assume everything in grams

2) Convert those grams to moles (using specific molar mass of each unique element)

3) Divide all the moles by the smallest mole you discovered.

4) Answer will be close to a whole number for each element and that's the answer.

First step, 28.6 g Mg, 14.3 g C, 57.1 g O

Second step:

28.6/24.305 = 1.1767 Mg

14.3/12.01= 1.1907 C

57.1/16.00 = 3.5688 O

Third step:

1.1767/1.1767 = 1 Mg

1.1907//1.1767 ~ 1 C

3.5688/1.1767 ~ 3 O

Put everything together you get!

[tex]MgCO_{3}[/tex]

The empirical formula for the compound is:

C. [tex]MgCO_3[/tex].

A chemical formula showing the simplest ratio of elements in a compound rather than the total number of atoms in the molecule.

Given:

28.6 g Mg, 14.3 g C, 57.1 g O

In order to determine empirical formula we will divide mass of each given  element with the molar mass of the respective element.

[tex]\frac{28.6}{24.305} = 1.1767 Mg[/tex]

[tex]\frac{14.3}{12.01}= 1.1907 C[/tex]

[tex]\frac{57.1}{16.00} = 3.5688 O[/tex]

Dividing each mass with the lowest mass:

[tex]\frac{1.1767}{1.1767 } = 1 Mg[/tex]

[tex]\frac{1.1907}{1.1767 } = 1 C[/tex]

[tex]\frac{3.5688}{1.1767} =3 O[/tex]

Thus, the empirical formula for the compound is [tex]MgCO_3[/tex].

Therefore, option C is correct.

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Answer:

B. psi

Explanation:

Pa is Pascal

atm is atmosphere

Hg is Mercury

hope it helps.

Answer:

salt

Explanation:

xdcfgvh jhg

Answer:

The liver has multiple functions, but two of its main functions within the digestive system are to make and secrete an important substance called bile and to process the blood coming from the small intestine containing the nutrients just absorbed. The liver purifies this blood of many impurities before traveling to the rest of the body.

Explanation:

Answer:

"Absorption is the process by which nutrient molecules pass through the wall of your digestive system into your blood. Materials that are not absorbed, such as fiber, are eliminated from the body as wastes."

Explanation:

Answer:

The hydrogen atoms in ammonia orient themselves as far away as possible from each other because this arrangement minimizes repulsion between electron groups present in the molecule

Explanation:

A covalent bond is formed between two atoms when a pair of electrons is shared between two atoms. This forms an electron group which occupies the the space between the atoms.  Similarly, a lone pair of electrons defines an electron group that is located primarily on one atom.

An ammonia molecule is made up of three hydrogen atoms covalently bonded to a central nitrogen atom. The electron groups in an ammonia molecule consists of a lone pair of electrons found on the nitrogen atom alone and three bonding pairs of electrons shared between the nitrogen and hydrogen atoms.

According to the VSEPR (valence shell electron pair repulsion) theory, since electron groups are negatively charged regions, they repel one another. Therefore,the best arrangement of a given number of electron groups is the one that minimizes the repulsion among them.

In accordance with the VSEPR theory, the hydrogen atoms in ammonia orient themselves as far away as possible from each other because this arrangement minimizes repulsion between electron groups present in the molecule.

Answer: Radioactive Decay

Explanation: Radioactive decay is a process that breaks atomic nuclei up, and releases energy. This energy can be in the form of heat and radiation. An example of this would be the formation of geothermal energy. This type of sustainable energy that produces heat from below the surface of the earth by this process of radioactive decay.

Hope this helps:)

Geological processes inside the Earth cause heat to be generated within it.

The word that finishes the sentence is "geothermal." Geothermal processes inside the Earth cause heat to be generated within it. Geothermal energy refers to the heat energy derived from the Earth's internal processes, such as radioactive decay of minerals, residual heat from the planet's formation, and heat transfer from the Earth's core.

These geothermal processes contribute to the overall heat budget of the Earth and play a crucial role in various geological phenomena, including plate tectonics, volcanic activity, and the formation of geothermal reservoirs. The heat generated from these processes can be harnessed for various applications, such as generating electricity through geothermal power plants, heating buildings through geothermal heating systems, and providing hot water for industrial and domestic use.

Geothermal energy is considered a renewable and sustainable energy source because it relies on the continuous heat production within the Earth. By tapping into this natural heat, we can utilize it as an alternative to fossil fuels and reduce greenhouse gas emissions. The study and understanding of geothermal processes are important for harnessing this valuable energy resource and for gaining insights into the Earth's dynamic internal structure and processes.

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Answer:

0° Celsius

Explanation:

The thermometer shows 0° Celsius which corresponds to 32° F.

Answer:

0 degrees celsius

Explanation:

just did the test

Answer:

It is important to all living things on land

Answer:

No because hydrogen chloride is gas and hydrochloric acid is (as stated in the name) an acid. The formula for hydrogen chloride is HCI(g), the little g states that the compound is a gas and the formula for hydrochloric acid is HCl(aq) and the little aq means aqueous.

Answer:

no. they are not the same

Explanation: Although, they both do have the same chemical formula HCL, they differ in their states of matter. Hydrogen chloride is a gas whereas hydrochloric acid is a solution of hydrogen chloride gas and water( creates an aquaeous solution). Hydrochloric acid is highly corrossive.

Answer:

8

Explanation:

Since Xe (xenon) is a noble gas, it has 8 valence electrons. It's outer shell is full and it is a stable element and doesn't like to react. Therefore, since the electron dot diagram is about valence electrons, 8 would be your answer.

An exothermic reaction creates heat.

The answer would be c) energy is released in the form of heat.

A chemical  reaction is classified as exothermic or endothermic based on the direction of heat flow during the reaction

The correct option for what must occur for a reaction to be classified as an exothermic reaction is option C

C) Energy is released in the form of heat

The reasons the above value is correct are;

An exothermic reaction is one in which energy in the form of light, heat or other forms because the sum of the energy in the product is less than the sum of energy contained in the reactants

Therefore, for a chemical reaction to be specifically classified as an endothermic reaction, instead of an exothermic reaction, is energy, in the form of heat (or light) must be released

The correct option is option C

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Answer:

w&x

Explanation:

The planets which are likely to be gas giants are W and X

Gas giant planets are planets which constitutes of only two gases; hydrogen and helium.

However, of all the planetry solar system, there are only four planets which are the major gas giant planets:

In conclusion, the planets which are likely to be gas giants are W and X

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Answer:

Moles = mass(m) / Molar mass (M)

A. 1.24g of Zn

m = 1.24g

M = 65.4 g/mol

moles of Zn = 1.24g/ 65.4g/mol

= 0.01896mol

B. 28.1 g Ar

m = 28.1g

M(Ar) = 39.9g/mol

moles of Ar = 28.1g/39.9g/mol

= 0.7043 mol

C. 84.0 g Ta

m = 84.0g

M(Ta) = 181g/mol

moles of Ta = 84.0g/181g/mol

= 0.4641 mol

D. 2.29x10^-2 g Li

m = 2.29x10^-2 g

M(Li) = 6.9g/mol

moles of Li = 2.29x10^-2 g / 6.9g/mol

= 0.0033 mol

Hope this helps

Answer:

The last option, option D is correct.

The order of increasing ionic radii of the three ions given is

Na⁺ < F⁻ < Cl⁻

Check Explanation for reasons why.

Explanation:

For elements in the same group of the periodic table, the ionic radii increases as we move down the group. This is because the number of shells increase as we move further down a group in the periodic table and that automatically confers a bigger radii to the element with the more shells.

So, between F⁻ and Cl⁻, we know the fluoride ion has electronic configuration 2, 8 (2 shells) after it gains an electron to its normal electronic configuration to form the ion, but the chloride ion has electronic configuration 2, 8, 8 (3 shells) when it achieves its own stable octet of outermost electrons.

So, it is clear how Cl⁻ ion has a bigger ionic radii than F⁻ and even Na⁺.

Then, to know which ion is bigger between Na⁺ and F⁻, it is known that when cations and anions have the same electronic configuration, the cations usually have the lesser ionic radii.

This is because in a normal, neutral atom, the number of electrons in the atom matches the number of protons. And the force of attraction between the protons and the electrons matches each other as they both have the same charges and are equal in number.

But cations result from the neutral element losing one or more electrons to achieve that stable octet. This makes the number of protons to exceed the number of electrons, hence, the electrons available are more tightly pulled towards the centre of the atom by the protons in the nucleus of the atom. This results in a reduced ionic radii.

Unlike anions that gain electrons to achieve that stable octet and have the electrons exceeding the protons in their ions, causing the pull of the protons on the electrons to be reduced, thereby resulting in a more repelled electrons pushing the ionic radii further than normal thereby increasing it.

Hope this Helps!!!

Answer:

atoms are bonded with a single bond one double bond

Answer: B: Earths tilt

Explanation:

Seasonal variation occurs because the Earth is tilted on its axis by 23.5˚. As Earth orbits the sun, its orientation to the sun changes.

Answer: D.  430 K

Explanation:

Using Gibbs Helmholtz equation:

[tex]\Delta G=\Delta H-T\Delta S[/tex]

[tex]\Delta G[/tex] = Gibbs free energy  

[tex]\Delta H[/tex] = enthalpy change  = 62.4 kJ/mol

[tex]\Delta S = entropy change  = 0.145 kJ/mol K

T = temperature in Kelvin

[tex]\Delta G[/tex] = +ve, reaction is non spontaneous

[tex]\Delta G[/tex]= -ve, reaction is spontaneous

[tex]\Delta G[/tex]= 0, reaction is in equilibrium

At equilibrium : [tex]T\Delta S=\Delta H[/tex]

[tex]T=\frac{\Delta H}{\Delta S}[/tex]

[tex]T=\frac{62.4}{0.145}[/tex]

[tex]T=430K[/tex]

Thus at 430 K , the reaction is at equilibrium.

Use the reaction I2(s) ⇌ l2(g), ΔH = 62.4 kJ/mol, ΔS+ 0.145 kJ/(mol⋅K), for this question. At what temperature is the reaction at equilibrium?

430 K

Answer:therefore the oxidation state of sulphur is +6 in the compound CaSO4.

Explanation:

The time taken to complete the reaction is 179 seconds.

Rate of reaction is the time taken for a reaction to attain completion. From the data presented, we have;

Initial concentration  = No

Final concentration = No - (0.8No) = 0.2No

rate constant = 9.2 x 10−3 s−1

time taken = t

Given that;

N =Noe^-kt

0.2No =Noe^-( 9.2 x 10−3 t)

0.2 = e^-( 9.2 x 10−3 t)

ln(0.2) = 9.2 x 10−3 t

t = ln(0.2)/-9.2 x 10−3

t = -1.609/-0.009

t= 179 seconds

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Answer:

a. 1,2,and 3.

Explanation:

When something turns liquid, e.g. metal, you need to heat it. When something turns gas, e.g. water, you need to heat it. And when something goes directly from solid to gas, e.g. dry ice, carbon dioxide, you need to add heat to it. hope this helps! Please mark brainiest.

Answer:

A. Arsenic

Explanation:

Arsenic is a metalloid. Arsenic has properties of both metals and non-metals that is why it is a metalloid.

Potassium, chlorine, and indium do not have both properties of metals and non-metals, therefore they are not metalloids.

Answer: A

Explanation: have a nice day

Answer:

1) 125.25 moles of carbon

2) 9.35 × 10⁻⁴ grams of cosmone

3) 1.44×10²¹ atoms of carbon

Explanation:

1) The given compound, cosmone, with molecular formula C₁₅H₂₆O has 15 toms f carbon per molecule, therefore, we have

8.35 mole of C₁₅H₂₆O, will contain 15 × 8.35 moles of carbon which is 125.25 moles of carbon

2) The number of moles of hydrogen in 6.58 × 10¹⁹ atoms of hydrogen = 6.58 × 10¹⁹/(6.02 × 10²³) = 1.09 × 10⁻⁴ moles

1 mole of cosmone contains 26 moles of hydrogen, therefore;

1 mole of hydrogen will be contained in 1/26 moles of cosmone

1.09 × 10⁻⁴ moles of hydrogen will be contained in 1/26 × 1.09 × 10⁻⁴moles of cosmone = 4.204 × 10⁻⁶ moles of cosmone

The molar mass of cosmone = 15*12.0107 + 26*1.00784 + 1 * 15.999 = 222.36334 g/mol

Therefore, the mass of 4.204 × 10⁻⁶ moles of cosmone = 4.204 × 10⁻⁶×222.36334  = 9.35 × 10⁻⁴ grams of cosmone

3) The number of moles in 8.00 g of cosmone = 8/222.36 = 0.036 moles

Therefore, number of moles of carbon atoms in 0.036 moles of cosmone = 0.036/15 moles which is 0.0024 moles of carbon;

1 mole of carbon atoms contains 6.02 × 10²³ atoms. therefore;

0.0024 moles of carbon will contain 6.02 × 10²³ × 0.0024 carbon atoms which is 1.44×10²¹ atoms of carbon.

1) The number of  moles of carbon are 125.25

2) The mass of sample 9.35 × 10⁻⁴ grams

3) The number of atoms of  carbon 1.44×10²¹

1) Molecular formula for cosmone is C₁₅H₂₆O, it has 15 atoms of carbon per molecule, therefore, we have

8.35 mole of C₁₅H₂₆O, will contain 15 * 8.35 moles of carbon which is 125.25 moles of carbon

2) The number of moles of hydrogen in 6.58 × 10¹⁹ atoms of hydrogen

= 6.58 × 10¹⁹/(6.02 × 10²³)

= 1.09 × 10⁻⁴ moles

1 mole of cosmone contains 26 moles of hydrogen, thus;

1 mole of hydrogen will be contained in 1/26 moles of cosmone

1.09 × 10⁻⁴ moles of hydrogen will be contained in 1/26 × 1.09 × 10⁻⁴moles of cosmone = 4.204 × 10⁻⁶ moles of cosmone

The molar mass of cosmone =222.36334 g/mol

Thus, the mass of 4.204 × 10⁻⁶ moles of cosmone

= 4.204 *  10⁻⁶ * 222.36334

Mass of sample = 9.35 × 10⁻⁴ grams of cosmone

3) The number of moles in 8.00 g of cosmone

= 8/222.36

= 0.036 moles

The number of moles of carbon atoms in 0.036 moles of cosmone = 0.036/15 moles which is 0.0024 moles of carbon;

1 mole of carbon atoms contains 6.02 * 10²³ atoms. Thus,

0.0024 moles of carbon will contain 6.02 * 10²³ * 0.0024 carbon atoms which is 1.44 * 10²¹ atoms of carbon.

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Answer:

Option D. For every mole of iron oxide consumed, two moles of iron are produced.

Explanation:

The balanced equation for the reaction is given below:

Fe2O3 + 3CO —> 2Fe + 3CO2

From the balanced equation above,

1 mole of iron oxide, Fe2O3 reacted with 3 moles of carbon monoxide, CO to produce 2 moles of iron, Fe and 3 moles of carbon dioxide, CO2.

Thus, with a careful observation of the equation, we can conclude that for every 1 mole of iron oxide, Fe2O3 consumed, 2 moles of iron, Fe are produced.

Answer:

in some animal they changes their body temperature according to the environment temperature. so are called cold blooded animals.they change their temperature for adaptation.

Answer:

D. all of the above.

Explanation:

The kinetic-molecular theory of gases suggests that; the particles of a gas move independently of each other, the particles in a gas move rapidly, the particles in a gas are far apart.

Hope it helps.

Answer:

a. N₂(g) + O₂(g) → 2 NO(g)

b. 2 HgO(s) → 2 Hg(l) + O₂(g)

c. 4 Fe(s) + 3 O₂(g) → 2 Fe₂O₃(s)

d. 2 Na(s) + Cl2(g) → 2 NaCl(s)

e. 2 Cu₂O(s) + O₂(g)  → 4 CuO(s)

Hope this helps.

Answer:

9.97 g (corrected to 3 significant figures.)

Explanation:

mass = no. of moles x molar mass

Atomic mass of Barium = 137.327; oxygen = 15.999,

so the molar mass of BaO = 137.327 + 15.999

=153.326

Hence, the mass is

0.065 x 153.326

=9.97 g (corrected to 3 significant figures.)

Answer:

9,97 g to the nearest hundredth.

Explanation:

Using the relative atomic masses of Barium and Oxygen:

1 mole of BaO has a mass of 137.327 + 16 = 153.327 g.

So 0.065 moles has a mass of 153.327 * 0.065

= 9.966 g.

Answer:

0.01836 M

Explanation:

Again the reaction equation is;

Fe(s) + Mn2+(aq) → Fe2+(aq) + Mn(s)

E°cell= 0.77 V

Ecell= 0.78 V

[Mn2+] = 0.040 M

[Fe2+] = the unknown

n=2

From Nernst's equation;

Ecell= E°cell- 0.0592/n log Q

0.78= 0.77 - 0.0592/2 log [Fe2+] /[0.040]

0.78-0.77= - 0.0592/2 log [Fe2+] /[0.040]

0.01/ -0.0296= log [Fe2+] /[0.040]

-0.3378= log [Fe2+] /[0.040]

Antilog(-0.3378) = [Fe2+] /[0.040]

0.459= [Fe2+] /[0.040]

[Fe2+] = 0.459 × 0.040

[Fe2+] = 0.01836 M

The Fe ion concentration in the galvanic cell has been 0.0186 M.

The Nernst equation has been used for the determination of the voltage of the galvanic cell.

It can be given as:

[tex]\rm E_c_e_l_l\;=\;E_0\;-\;\dfrac{0.059}{n}\;\times\;log\;\dfrac{[Fe^+]}{[Mn^2^+]}[/tex]

where, n = number of electrons transfer = 2

[tex]\rm E_0[/tex] = initial voltage = 0.77 V

[tex]\rm E_c_e_l_l[/tex] = cell voltage = 0.78 V

Iron ion concentration = 0.040 M

Susbstituting the values:

0.78 = 0.77 - [tex]\rm \dfrac{0.059}{2}\;\times\;log\;\dfrac{[Fe^2^+]}{[0.040]}[/tex]

0.78 - 0.77 = -0.0296 [tex]\rm \times\;log\;\dfrac{[Fe^2^+]}{[0.040]}[/tex]

-0.03378 = [tex]\rm log\;\dfrac{[Fe^2^+]}{[0.040]}[/tex]

antilog (-0.03378) = [tex]\rm \dfrac{[Fe^2^+]}{0.040}[/tex]

Iron ion concentration = 0.0186 M

Thus, the Fe ion concentration in the galvanic cell has been 0.0186 M.

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