AYOSOMEONEHELPMEWITHTHESETWOMULTIPLECHOICEQUESTIONS

I’ll give a brainest

answer: 6.875 moles

nCH4 = nCO2 = 110/(12 + 4) = 6.875

6.875 moles of carbon dioxide are produced from the combustion of 110 g of CH4.

The mole is a SI unit of measurement that is used to calculate the quantity of any substance.

The reaction is

[tex]\rm CH_4 + 2O_2 = CO_2 + 2 H_2O[/tex]

To calculate the number of moles, we will use the following formula

[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\\\rm Number\;of \;moles= \dfrac{110g}{12 + 4 } =6.875[/tex]

Thus, the number of moles are 6.875.

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Answer:

The greenhouse effect

Explanation:

The greenhouse effect is a straightforward method that heats the Earth's exterior. When the Sun's rays touch the Earth's environment, some of it is bounced back to space and the rest is grasped and re-heated by greenhouse gases. The consumed energy heats the environment and the exterior of the Earth.

Answer:

location

topography (quality)

other facilities close by e.g gas station (it is not advisable to live close to a gas station, incase of explosion)

Answer:

school district, daily commute, neighborhood character, property value, nearby amenities

Answer:

An attraction between the positive end of one molecule and the negative end of another

Explanation:

The molecular shape affects the polarity as:

A. If the molecule contains nonpolar bonds, a bent shape will make it polar.

The sub-atomic math of a particle influences its extremity. Every CO bond has a dipole second, however they point in inverse bearings so the net CO2 atom is nonpolar. Conversely, H2O is polar in nature of the fact that the OH bond minutes don't offset.

Thus, option A is correct.

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Answer:

3. Granite and Gneiss.

Gneiss is a coarse to medium grained banded metamorphic rock formed from igneous or sedimentary rocks during regional metamorphism. Banded gneisses called migmatites are composed of alternating light colored layers of granite or quartz feldspar and dark layers rich in biotite.

Granite is a purely natural stone that comes directly from stone quarries and is then cut into thin slabs, polished, and fabricated into countertops. So-called quartz countertops are engineered stone products that may contain a large percentage of natural quartz but may also include other minerals.

Answer/Explanation:

Part 1 and 3: Test tube 4. The hot water and Acid added to the substance makes it much more reactive, which is the reason why the new substance is bubbling. Hot water allows the particles in a chemical reaction have enough force and more chances to go through actual reaction process. This also caused it to create the most bubbles.

Part 2 and 4: Test tube 1 had the least amount of chemical reactivity. Cold water slows down the amount of times a particle in the substance hits another. This reduces the chance of it reacting and the strength of it's reaction. Test tube 1 was also missing the citric acid. Since acids have low pH it is very reactive with other particles with substances that contain less than 8 valence electrons. Without the acid it doesn't have ad much urge to react with. The lower the pH the better reactivity.

Answer:

xcvbn

Explanation:

nkj

Answer:

what he said

Explanation:

There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. If an element with no electrons to share belongs to noble gas family.

Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.

Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.

Noble gas is the group 18 elements whose octet is complete and they are not ready to give or take electrons from other element. They are very much stable on its own.

Therefore if an element has no electrons to share and is stable then that element belongs to group 18 or noble gas family.

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Answer:

percipitate or sedements from chemical reactions

Answer:

55°C

Explanation:

original is 20

after gaining heat is 75

75 - 20 = 55

Answer:

17242,5J

Explanation:

Given parameters:

Mass of water  = 75g

Initial temperature  = 20°C

Final temperature  = 75°C

Unknown:

Amount of heat absorbed  = ?

Solution

To find the amount of heat absorbed by water;

      H  = mcΔt

 m is the mass

  c is the specific heat capacity of water  = 4.18J/g°C

 Insert the parameters and solve;

       H  = 75 x 4.18 x (75 - 20)

       H  = 17242,5J

Answer:

Explanation:

an atom is a neutral particle because it contain equal number of positive and negatively charge particle

Answer:

because it consists of the equal number of protons

Answer:

They are both alive organisms. They can breathe and they are known as living creatures. The stay in the same place and food comes to them and they dont hunt for food. They are both like traps.

Explanation:

Answer:

2457.6

Explanation:

I calculated the answer and got it right.

Answer:

the plate movement that caused by heat-related movement is the mantle

Explanation:

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L}\\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{7.13 \times {10}^{28} }{6.02 \times {10}^{23} } \\ = 118438.538...[/tex]

We have the final answer as

Hope this helps you

Answer:

this is answer brother

Answer: Element 1

Explanation:

If an element has 3 valence shells, then it must be in the third column so element 1 is the right answer. Hope this helps! :)

Answer:

Explanation:

Edmentum

The arrangement of electrons within an atom's orbitals is known as its electronic configuration. The atomic number, which is equal to the number of protons in every neutral atom, is the set quantity of electrons that make up each neutral atom.

The distribution of an element's atoms' electrons throughout several atomic orbitals is symbolically represented by the electronic configuration of that element.

A standardized nomenclature is used for expressing electron configurations, in which the energy level and type of orbital are written first, followed by the number of electrons in the orbital, which is expressed in superscript.

The correct matches are:

Zn: [Ar] 3d¹⁰ 4s²

Fe: [Ar] 3d⁶ 4s²

Sn: [Kr] 4d¹⁰5s²5p²

Cl: [Ne] 3s² 3p⁵

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Answer:

yes

Explanation:

Nitride, any of a class of chemical compounds in which nitrogen is combined with an element of similar or lower electronegativity, such as boron, silicon, and most metals.

The question, Is nitride on the periodic table, would have the answer of No as it is not an element.

The periodic table lists the elements, which are the basic building blocks of matter. Nitride is not an element, but rather a compound that is formed when nitrogen combines with another element.

Nitrogen is a non-metal that is found in group 15 of the periodic table. It has an atomic number of 7, which means that it has 7 protons in its nucleus. Nitrogen is a very reactive element, and it can combine with many other elements to form compounds.

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Answer:

c

Explanation:

that's the direction the truck is moving

Explanation:

The different subatomic particles in an atom are the:

Protons and neutrons are located in the nucleus of an atom which is the tiny center of the atom.

Electrons orbits around the nucleus and fill the rest of the volume of atom.

Ideal Gas Law Formula.

Brainliest?

Answer:

12 individuals are born 10 individuals emigrate, 4 individuals die, 14 individuals immigrate, 0 individuals are born

Explanation:

From the formula:

Population growth = (birth rate + immigration) – (death rate + emigration)

                       = (b + i) - (d + e)

For the first option, b = 12, i = 0, d = 12, e = 12

population growth = (12+0) - (12+12) = -12

For the second option: b = 13, i = 0, d = 3, e = 16

population growth = (13+0) - (3+16) = -6

For the third option: b = 12, i = 20, d = 0, e = 8

population growth = (12+20) - (0+8) = 24

For the last option: b = 0, i = 14, d = 4, e = 10

population growth = (0+14) - (4+10) = 0

Hence, the last option is the correct option.

Answer:

d because i got a 100%

Explanation:

Answer:

D

Explanation:

Option D is the right answer. A substance that has been reduced undergoes chemical reduction. They show the following properties;

The equation that represents the process of reducing a specie is : ( D )

   NO₃ (aq) - NO(g)

The reduction of a specie is a chemical reaction process which  involves the removal of oxygen atom(s) and the the addition of hydrogen.  

A reduced specie gains/accepts electrons therefore becoming more electronegative  ( i.e. the number of electronegative atoms around it is reduced ) and It also experiences a decrease in its oxidation number

From the options provided the number of oxygen present in NO₃ reduces from O₃  to O  This makes option D the correct option representing the reduction of specie

Hence we can conclude that the The equation that represents the process of reducing a specie is

   NO₃ (aq) - NO(g)

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Answer:

B. Presented in all matter!

Answer:

B- presented in all matter :)

Explanation:

good luck!

Answer:

I CANT

Explanation:

Answer:

phisical i think

Explanation:

chemical would be baking powder in a pancake, the pancake would be in turn more brown cause of baking powder mixing with flower.