Which two elements are in the same group based on their atomic model?
Please help me with this ASAP.

Answer:

Chromatography involves solvent separation on a solid medium. Distillation takes advantage of differences in boiling points. Evaporation removes a liquid from a solution to leave a solid material. Filtration separates solids of different sizes.

Explanation:

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Answer:

A.3

Three primary amines

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Answer:

Which line represents travel at the fastest speed? Justify your answer.__

b. Describe the line that should be added for an object that is not moving with respect to the chosen reference point.__

Answer the question using 5 complete sentences and the vocabulary terms; velocity, position, and distance

Which line represents travel at the fastest speed? Justify your answer.__

b. Describe the line that should be added for an object that is not moving with respect to the chosen reference point.__

Answer the question using 5 complete sentences and the vocabulary terms; velocity, position, and distance

Explanation:

Answer:

Random errors will shift each measurement from its true value by a random amount and in a random direction. These will affect reliability (since they're random) but may not affect the overall accuracy of a result.

Answer:

a

Explanation:

i took test

Answer:

D) C2H6

Explanation:

All the other molecules contain double (or triple) bonds except for C2H6.

Answer:

c. chlorine, with an outer electron shell filled with 7 of a possible 8 electrons

Explanation:

Hope this helps!

The structure in the option A has 7 electrons in the outer shell of its electronic configuration , is unstable and so is most likely to form bond with another atom.

Electrons are arranged in various shells around the nucleus , this arrangement is called electronic structure or configuration.

Each shell can occupy certain fixed number of electrons.

Beside Option A , all the other configurations show stable structures as the last shell has eight electrons and are stable according to the octet rule.

The structure in the option A has 7 electrons in the shell and so is most likely to form bond with another atom.

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Answer:

c) The natural home or environment of an animal, plant, or other organism

Explanation:

Please note that in order to post questions in Science, you must post in Science section, but not in History. You are asking a wrong question in the wrong section.

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Answer:

A catalytic converter

Explanation:

Diesel filters are used to clean fuel not emissions, engine injection puts fuel directly into the engine and a transmission clutch changes the cars transmission.

Answer:

carbon monoxide and nitrogen oxide are needed to be properly maintained

It is appropriate to form double or triple bonds in a Lewis structure when four or six electrons are shared.

A Lewis structure is a representation of a molecule using dots to show the valence electrons in the molecule. This dots are shown around the symbols of the elements.

However, in instances where four or six electrons are shared between bonding atoms, a double or triple bond is used. A double bond means that four electrons are shared. A triple bond means that six electrons are shared.

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The energy of a photon that has a frequency of 2.3 x 10¹⁴ Hz is 1.524 × 10-¹⁹J

HOW TO CALCULATE ENERGY OF A PHOTON:

E = hf

Where;

E = energy of photon (J)

h = Planck's constant (6.626 × 10-³⁴J)

f = frequency of photon (Hz)

E = 6.626 × 10-³⁴ × 2.3 × 10¹⁴

E = 15.24 × 10-³⁴+¹⁴

E = 15.24 × 10-²⁰J

E = 1.524 × 10-¹⁹J

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Answer: 1. (0.5 to 1)

              2. (Fluorine)

              3. (KNO3

              4. (Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally.)

              5. (Fe and S have a covalent bond, and S and O have covalent bonds, too.)

Explanation:

Ye, have great day.

The periodic table is an arrangement of elements according to their periodic properties.

Polar covalent bonds are those compounds in which unsymmetrical electron distribution in bonds leads to polarity in the molecule. Examples of such compounds include; HCl, CHCl3, etc. A polar covalent bond occurs when the electronegativity differences between atoms lies within the range of 0.5 to 1.

Since electronegativity increases across the period and we also know that highly electropositive metals(having very low electronegativity) and highly electronegative nonmetals(having high electronegativity)  form a strong ionic bond, it follows that fluorine (F) and cesium (Cs) will form a strong ionic bond.

A poly atomic ion is an ion that contains more than one atom. Given the options listed NH4^+ is an example of a polyatomic ion.

The difference between polar and nonpolar covalent bonds is that polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally.

In FeSO4, Fe and S have an ionic bond, while S and O have covalent bonds.

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Answer:

Physicians and it is ethical because they promise to help

Explanation:

Answer:

iiiiiiddddiiilllooeiuehe

Answer:

46.2 amu

Explanation:

The average atomic mass of an element can be determined using the percentage abundance and mass of its isotopes. The average atomic mass of the hypothetical element Jovian is 46.2 amu.

Most of the elements have two or more isotopes in nature with different percentage abundance and mass. The average atomic mass of the element is then calculated using the formula written below:

Average atomic mass = % abundance /100 × mass of isotope 1  +  % abundance /100 × mass of isotope 2 + .....

Given the mass % abundance of Jovian -44 = 22.4 %

Jovian- 46 = 44 %

Jovian -48 = (100 - (44 + 22.4)) = 33.6 %

Average atomic mass of Jovian  =  ( 22.4 /100 × 44 ) +  ( 44 /100 × 46) +  ( 33.6  /100 × 48 ) = 46.2 amu

Therefore, the average atomic mass of the hypothetical element is 46.2 amu.

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Answer:

false

Explanation:

hope this helps you

Answer:

False, if the flask becomes colder it's endothermic. I hope this helps! :)

Answer:

Map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground.

Explanation:

For example, on a 1:100000 scale map, 1cm on the map equals 1km on the ground.

THE ANSWER IS ON THE PICTURE HOPE IT HELPS

When you rub an inflated balloon on your head and it makes your hair stand up, the force that makes the hair stand up is known as static electricity.

When the balloon is rubbed on the head, electrons from the hair atoms move into the balloon, thus making the balloon to be negatively charged and the hair positively charged due to loss of electrons.

Unlike charges attracts. Thus, when you try to pull the balloon away slowly, the positively charged hair and the negatively charged balloon will attract each other and this is usually what makes the hair stand up.

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Answer:

static electricity

Explanation:

this is because there is an imbalance between negative and positive charges

when you keep on rubbing, a negative charge is created which is carried by electrons.

when you pull the balloon away slowly, the opposite charges attract to each other which makes your hair attract to the balloon

Answer: D. Potassium

Explanation:

A. Salad- a mixture of vegetables or fruits❌

B. Sugar- a compound made up of many elemnts❌

C. Water-  a molecule made up of two elements (water and hydrogen)❌

D. Potassium- the only pure element of the options provided.✅

Answer:

D, potassium

Explanation: took test ! btw

Answer:22.4 L methane reacts with 44.8 L of oxygen to give 22.4 L of CO  

2  and 44.8 L of water.

Explanation:

Hope you could get an idea from here.

Doubt clarification - use comment section.

A non-covalent interactions between  molecules are van der Waal's forces and hydrogen bonds.

Non-covalent interaction is an interaction which does not involve sharing of electrons and in this aspect it differs from covalent bond.It rather involves dispersed variations  of electromagnetic interactions  which are present between the molecules or within the molecule.

The energy released during the formation of these interactions  is of the order of 1-5 kcal .They are classified as electrostatic, pi effects , van der waals forces  and hydrophobic effects.

They are important in maintaining the three dimensional structure of large molecules such as proteins ,nucleic acids ,etc.They are also involved in biological processes . They heavily influence drug design process and design of materials.

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Answer:

Explanation:

a. NaCl+ AgNO3-----> NaNO3+ AgCl

b. Số mol của NaCl= 0,2*0,5= 0,1 (mol)

------> Số mol của kết tủa AgCl tạo thành= 0,1 mol (dựa vào phương trình hóa học)

-----> Khối lượng của kết tủa AgCl tạo thành= 0,1*143,5=14,35(g)

c. Số mol của AgNO3= số mol của NaCl= 0,1 (mol)

------> Nồng độ mol của dd AgNO3 đã tham gia phản ứng= [tex]\frac{0,1}{0,4}[/tex]=0,25(M)

Answer:

Here's it.

Explanation:

Concentrated acids are very corrosive and dangerous chemicals that are commonly encountered in the laboratory. ... Concentrated acids may be fatal if inhaled; and can cause severe eye and skin burns, severe respiratory and digestive tract burns. Contact with other materials may cause a fire.

Answer:

The more concentrated acid something is the more strength it has.

Explanation:

If it is very strong it could melt a spoon, and burn human flesh, I don't think this needs further explanation.