Below is the Lewis structure for methane.


HELPP!!
Based on its Lewis structure, what is the correct shape of a methane molecule?
A.
tetrahedral
B.
trigonal planar
C.
trigonal pyramidal
D.
bent

To convert a second measurement to a year measurement, divide the time by the conversion ratio.

Since one year is equal to 31,556,952 seconds, you can use this simple formula to convert:

years = seconds ÷ 31,556,952

1 ×10^20 sec to years = 3.16887646 × 10^12 years

Answer:

Unlike the speed of your car when running errands, the speed of light is constant throughout the universe and is known to high precision. ... To find the distance of a light-year, you multiply this speed by the number of hours in a year (8,766). The result: One light-year equals 5,878,625,370,000 miles (9.5 trillion km).

Answer:

-Speed of light is the fastest speed ever imaginable. No object having a mass can go faster than light.

Light year is the distance traveled by light, if it moves continuously for 1 whole year, or roughly 365 days.

Explanation:

Answer:

properties is the answer

there are about 115 elements, each of which has its own chemical. properties

Answer:

Chemical symbol

Explanation:

There are 115 elements, each of which has its own chemical symbol .

Answer:

They do attract

Explanation:

Protons and neutrons aren't electrically attracted to each other but when they get close enough they can exchange particles and become bound together by a strong force.

Answer:

highly corrosive but not highly flammable

Explanation:

When a chemical has a high, or even a 1, in the health rating, it usually means that the chemical is corrosive or can damage a human in another way.

Answer:   highly corrosive but not highly flammable

Explanation:  When a chemical has a high, or even a 1, in the health rating, it usually means that the chemical is corrosive or can damage a human in another way.

Answer:

the correct answer is option B batteries use chemicals to store energy

We have that the statement that remains true about batteries is

"Batteries use chemical to store energy "

Option B

-All battery are able to be recharged that is not correct as some batteries are non rechargeable

-A battery is a device composed of petrochemical cells, that rel sole upon the energy from chemical reactions to give off charge

-A battery is a device that is use to store energy. Therefore Batteries to not conserve energy

Hence the statement that remains true about batteries is

"Batteries use chemical to store energy "

Option B

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 Answer:    67%

Explanation:  The weighted averages of the two isotopes must add to 131.01.  Let Y be the percentage of isotope 129.  Then (1-Y) will be the percentage of isotope 132.  The weighted average of each is:

129:   129Y

132:    132(1-Y)

Their sum is equal to 131.01

129Y + 132(1-Y) = 131.01

Y = 0.33, or 33%

(1-Y) = 0.67, or 67%

Check:  129*(0.33) = 42.57

             132*(0.67) = 88.44

                     Sum =   131.01  It checks OK  The 132 isotopes is 67% of the sample.

Considering the definition of atomic mass, isotopes and atomic mass of an element, the percent abundance of ¹³²X is 67%.

First of all, the atomic mass (A) is obtained by adding the number of protons and neutrons in a given nucleus of a chemical element.

The same chemical element can be made up of different atoms, that is, their atomic numbers are the same, but the number of neutrons is different. These atoms are called isotopes of the element.

On the other hand, the atomic mass of an element is the weighted average mass of its natural isotopes. In other words, the atomic masses of chemical elements are usually calculated as the weighted average of the masses of the different isotopes of each element, taking into account the relative abundance of each of them.

In this case, you know:

Then, the average mass of X can be calculated as:

132 amu×y + 129 amu×( 1-y)= 131.01 amu

Solving, you can find the percent abundance of ¹³²X:

132 amu×y + 129 amu×1 - 129 amu×y= 131.01 amu

132 amu×y + 129 amu - 129 amu×y= 131.01 amu

132 amu×y - 129 amu×y= 131.01 amu - 129 amu

3 amu×y= 2.01 amu

y= 2.01 amu÷ 3 amu

y= 0.67= 67%

Finally, the percent abundance of ¹³²X is 67%.

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Answer:

conclusions i think i am not confirmed

Answer:

b-data

Explanation:

right on the unit test review on edge

brainliest???

Answer:

They are tube like structures that absorb nutrients or water from digested food into the bloodstream.

Hi i'm butt your

hahahahahahahahahahahahaha

Answer:

a scientific variable is a factor or condition that can change or effect the final outcome. There are three types being an independent variable, dependent variable, and controlled variable.

Explanation:

When an acid is dissolved in water it forms hydrogen ions (H+) that combine with water to form the hydronium ion (H3O+) .

Answer:

Acids are substances that when dissolved in water release hydrogen ions, H+(aq). ... When dissolved, bases release hydroxide ions, OH-(aq) into solution. Water is the product of an acid and base reacting. Chemists say that the acid and base cancel or neutralise each other, hence the reaction is known as "neutralisation".

Explanation:

Answer:

Platinum sulfide

Explanation:

Answer:

life scientist study life and the many processes that occur in living things__during experiments__-

Answer:

Hope this helps.

Explanation:

See the picture. Hope it helps. Sorry if i was incorrect.

Answer:

20 neutrons

Explanation:

Taking into account the definition of molarity and ppm, if the molarity of a 50 mL Fe²⁺ solution is 6.53*10⁻⁵ M, the concentration in ppm is 5.846×10⁻⁵.

First of all, you have to know that molarity is a measure of the concentration of a substance that indicates the number of moles of solute that are dissolved in a given volume.

Molarity is determined by:

[tex]Molarity=\frac{number of moles of solute}{volume}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].

On the other hand, ppm is a concentration unit used for very dilute solutions. A solution with a concentration of 1 ppm contains 1 gram of solute per million (10⁶) grams of solution, or equivalently, 1 mg of solute per kilogram of solution.

Since these dilute aqueous solutions have densities of 1 g/mL = 1 kg/L, 1 ppm also corresponds to 1 mg of solute per liter of solution.

Then, knowing the molarity of the solution, which is expressed in [tex]\frac{moles}{liter}[/tex], it is necessary to find the concentration expressed in [tex]\frac{mg}{liter}[/tex]. To do this, you must first know the number of moles present in 50 mL. For that, you replace the value of the molar concentration and the volume in the definition of molarity as follows, where 50 mL=0.05 L (being 1000 mL= 1 L):

[tex]6.53x10^{-5} \frac{mole}{liter} =\frac{number of moles of solute}{0.05 L}[/tex]

Solving:

number of moles= 6.53×10⁻⁵[tex]\frac{moles}{liter}[/tex] *0.05 L

number of moles= 3.265×10⁻⁶ moles

Being the atomic mass of Fe 55.85, then the mass containing 3.265×10⁻⁶ moles moles of Fe is calculated by:

[tex]mass=3.265x10^{-6} molesx\frac{55.85 grams}{1 mole}[/tex]

mass=5.846×10⁻⁸ grams

Being 1 grams equals to 1000 mg, then 5.846×10⁻⁸ grams is equal to 5.846×10⁻⁵ mg.

Then in 1 L of solution there is present 5.846×10⁻⁵ mg of Fe²⁺.

Remembering that in dilute solutions 1 ppm = 1 mg/L, if the molarity of a 50 mL Fe²⁺ solution is 6.53*10⁻⁵ M, the concentration in ppm is 5.846×10⁻⁵.

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Answer:

7790

Explanation:

Answer:

7790 decigrams

Explanation:

The main duties of a laboratory shop are to offer a secure setting for the distribution and storage of materials, tools, and supplies used in laboratories.

Any laboratory or research facility must have this to run efficiently. A laboratory store's primary duty is to safely and securely store materials, equipment, and supplies used in laboratories.

Making sure the objects are stored in a way that keeps them from becoming harmed or contaminated is part of this. This also entails making certain that the goods are arranged such that they may be quickly found and retrieved when required.

In addition, the laboratory store should have a system in place to track the inventory and ensure that the items are always in stock. A laboratory store's second purpose is to act as a distribution system for materials, tools, and supplies used in labs.

This involves making sure the supplies are sent to the right people in a timely way and that they are kept in the suitable places for storage. Additionally, the staff should be able to receive support and guidance from the laboratory shop on how to use and care for the equipment.

The storage and distribution of laboratory supplies, tools, and materials takes place in a safe atmosphere, which is the laboratory store's third purpose. This involves making sure the assets are kept in a secure place and that only authorised people are allowed access to them.

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Answer:

solids, liquids, gases

Answer:

I think its B because yeah lol but I hope you get it right

The following can be best described as a gaseous compound. The correct option is C.

A state of matter is one of the various forms that matter can take in physics. In everyday life, four states of matter are visible: solid, liquid, gas, and plasma.

The elements those are gases basically at standard temperature as well as pressure are referred to as gaseous elements. The periodic table contains 11 gaseous elements.

A gas is a sample of matter that conforms to the shape of the container in which it is held and acquires a uniform density inside the container, even when gravity is present and regardless of the amount of substance in the container.

The given image depicts that the molecules of particles are at some distance from each other, this usually implies for gaseous compound.

Thus, the correct option is C.

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Answer:

3 protons and also 3 electrons

Explanation:

z=p=e

Answer:

7.22 feet long

Explanation:

1 meter = 3.28084 feet

2.2 × 3.28084 = 7.21785

= 7.22

I hope this is helpful :)

Answer:

the moon and the planets are closer than other stars

Answer:

0.25M

Explanation:

The formula of concentration is c=m/M•V

c=1.85g/74g.mol•0.10L

c=0.25 M

Answer:

Bright green

Explanation:

Halogens in ionic form, will react with copper wire. When heated in a flame, a wire that contains halogens will produce a bright, green flame.

The heating of halogens with the copper forms a bright green flame.

A flame test is given as the test for the identification of the elements with the analysis of the color of flame on burning.

The elements on heating are excited to higher energy levels, and when they return, they emit the absorbed radiation in the form of light. The halogens are ionic in nature, and with the flame test in the presence of the heated copper, they liberate bright green flame.

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Answer:

1) test a hypothesis this is the main aim of experiment

We have that 70kg of Copper Cu is having a volume of [tex]V=7.76442liters[/tex]

1 cmCu

=9 g Cu

9.5 x 10^21 atoms Cu

=1 g Cu

1 kg  =1000 g

1 cm

=1 ml

1

=1000 cm3

70.0 kg x  X  _X  II

70.0 kg•L

Generally We First determine the No of Atoms in 70kg of cu

No of Atoms of c[tex]u=\frac{weight}{atomic mass of cu}*n[/tex]

Where

n=Avogadro's Constant

[tex]n= 6.02214076 x 10^{23}[/tex]

Therefore

No of Atoms of cu[tex]=\frac{70*10^3}{63.5}*6.02214076 * 10^{23}[/tex]

No of Atoms of cu=6.63858037x10^{26} atoms of Cu

Hence

We determine the the grams of copper derived from [tex]6.63858037x10^{26}[/tex]atoms of Cu

No of grams of cu[tex]=\frac{6.63858037x10^{26}}{9.5 x 10^{21}}*1[/tex]

No of grams of cu=69879.79337 g of Cu

Generally

No of grams of Cu=liters

Where

9 g of Cu= 1cm^3 Cu

Therefore

Volume of cu

[tex]V=(69879.79337)*\frac{1}{9}*\frac{1}{1000}[/tex]

[tex]V=7.76442liters[/tex]

In conclusion

70kg of Copper Cu is having a volume of [tex]V=7.76442liters[/tex]

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We are to drag the given conversion units onto the boxes in the equation in order to make conversions in the boxes that are left empty.

The dimensional analysis for the conversion ratio is given as follows

1cm^3 Cu = 9g Cu        9.5*10^21  atoms of Cu = 1 g Cu

1 kg     =  1000 g                                       1 cm^3 = 1 mL

1 L      =  1000 cm^3

 Here is the box equation

        box         box        box

70 g    ×-----  ×  ------   × -----  =  

        box         box        box

From the given information, the volume of the Cu sample in Liters is:

= 7.765  liters

 From the parameters given:

The first thing we are to do is to calculate the number of atoms of Cu in 70 kg by using Avogadro's constant.

We know that the number of atoms of Cu is:

[tex]\mathbf{= \dfrac{mass \ weight \ of \ Cu}{atomic \ mass \ of \ cu}\times avogadro's \ constant}[/tex]

where;

the number of Cu atoms is:

[tex]\mathbf{= \dfrac{70*10^3}{63.5}\times 6.023 * 10^{23}}[/tex]

[tex]\mathbf{= 6.6395 \times 10^{26} \ atoms \ of \ Cu}[/tex]

However, from the given conversion ratios:

If [tex]\mathbf{9.5\times10^{2}}[/tex]  atoms of Cu = 1 gram of Cu  

∴

atoms of Cu will be:

[tex]\mathbf{= \dfrac{6.6395 \times 10^{26} \ atoms \ of \ Cu \times 1 \ gram \ of \ Cu}{9.5*10^{21} \ atoms \ of \ Cu }}[/tex]

[tex]\mathbf{= 0.69889 *10^{5} \ grams \ of \ Cu}[/tex]

Since:

∴

The correct setup of the sample in the box can be computed as follows:

[tex]\mathbf{= 0.69889 *10^{5} \ gram \ of \ Cu \ \times \dfrac{1 cm^3 \ of \ Cu }{9 \ g \ of \ Cu }\times \dfrac{1 \ Liter}{1000 \ cm^3}}[/tex]

= 7.765  liters

Therefore, we can conclude that the Volume of Cu sample in liters is:

= 7.765 liters

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wE know

[tex]\boxed{\sf E\propto T}[/tex]

Hence If Kinetic energy is doubled Temperature will also be doubled.

[tex]\\ \sf\longmapsto T=12(2)=24°C[/tex]

The kinetic energy is directly proportional to the temperature. Hence, as kinetic energy doubles, the temperature become  approximately 297.15°C.

Kinetic energy is the energy generated by virtue of the motion of the substance.

Assuming the pressure and volume of the gas sample are constant, the temperature of an ideal gas is directly proportional to its average kinetic energy. When the total kinetic energy of the gas doubles, its temperature will also double.

To calculate the new temperature of the sample, we can use the following equation:

(T2/T1) = (E2/E1)

where T1 is the initial temperature, E1 is the initial total kinetic energy, T2 is the final temperature, and E2 is the final total kinetic energy.

Since the total kinetic energy has doubled, E2 = 2E1. Substituting this into the equation, we get:

(T2/T1) = 2

Multiplying both sides by T1, we get:

T2 = 2T1

Substituting the initial temperature T1 = 12°C + 273.15 K = 285.15 K, we get:

T2 = 2 x 285.15 K = 570.3 K

Converting the final temperature from Kelvin to Celsius, we get:

T2 = 570.3 K - 273.15 = 297.15°C

Therefore, the new temperature of the gas sample is approximately 297.15°C.

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Answer:

Chemical bonds hold molecules together and create temporary connections that are essential to life. Types of chemical bonds including covalent, ionic,

Explanation:

Ionic bond will form by transferring the electrons , covalent bond formed by sharing the electrons while hydrogen bond will be formed by bond between electronegative atom and hydrogen molecule.

The chemical bond is formed when electrons are transferred from one atom to another. An ionic bond is the name for this type of relationship. Their melting and boiling points are quite high. Ionic chemicals, in other words, seem to be non-volatile.

When one non-metal reacts with just another non-metal, electrons are shared across their atoms, resulting in the development of a covalent bond. Among two or more atoms with same non-metal, a covalent connection can be established.

Hydrogen bonding is just a sort of dipole-dipole attraction that occurs between molecules rather than a covalently link with a hydrogen atom.

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