is drawing on paper a chemical or physical change

Electrons can gain the energy it needs by absorbing light. If the electron jumps from the second energy level down to the first energy level, it must give off some energy by emitting light. The atom absorbs or emits light in discrete packets called photons, and each photon has a definite energy.

☁️My Answer☁️:

Atomic electrons lose / gain energy when transferring from one orbital to another and hence emitting / absorbing a photon. Free electrons (by which I mean electrons that are not part of an atom) lose or gain energy by scattering inelastic ally with atoms or molecules. In this case, energy is transferred to / from the atom or molecule from / to the electron in the form of kinetic energy

Answer:

Elements in group 17 form C. -1 ions

Answer:1.atoms give one or more electrons with each other to form the bond

2. Each atom is left with a complete outer shell

3. A covalent bond forms between two

nonmetals

Explanation:

Answer:

1). Scientific

2). Plating the diluted bacteria on media that supports the growth of only living micro organisms. Statistically accurate.

Answer:

maybe it is true

Explanation:

it can 5×then the normal one

Answer: a bench made of composite plastic

Explanation:

The chemical weathering can be defined as the process in which a chemical causes the degradation and decomposition of the rocks into small particles. The iron rods, feldspar, and marble will weather considerably with a greater danger as the have a strong solid body. But plastic when exposed to a chemical agent usually melts and thus there is least or no danger of chemical weathering of plastic.

Answer:

Explanation:

Conduction is the transfer of heat through stationary matter by physical contact. (The matter is stationary on a macroscopic scale—we know there is thermal motion of the atoms and molecules at any temperature above absolute zero.) Heat transferred from an electric stove to the bottom of a pot is an example of conduction.

Some materials conduct thermal energy faster than others. For example, the pillow in your room may the same temperature as the metal doorknob, but the doorknob feels cooler to the touch. In general, good conductors of electricity (metals like copper, aluminum, gold, and silver) are also good heat conductors, whereas insulators of electricity (wood, plastic, and rubber) are poor he

The percentage of elements in the compound is determined from the number of elements in the compound

Proust states the Comparative Law that compounds are formed from elements with the same Mass Comparison so that compounds have a fixed composition of elements

[tex]\tt \%A~in~A_xB_y=\dfrac{x\times Ar~A}{MW~A_xB_y}\times 100\%[/tex]

[tex]\tt \%B~in~A_xB_y=\dfrac{y\times Ar~B}{MW~A_xB_y}\times 100\%[/tex]

Example

% Lithium (Li) in Li₂CO₃(lithium carbonate)

Ar of Li = 6.941 g/mol

MW of  Li₂CO₃  = 73.891 g/mol

[tex]\tt \%Li=\dfrac{2.Ar~Li}{MW~Li_2CO_3}\times 100\%\\\\\%Li=\dfrac{2\times 6.941}{73.891}\times 100\%=18.79\%[/tex]

Answer:

The climate was very hot in earlier time periods and became colder in later time periods.

Explanation:

I believe it is B.

The earlier days in the earth was of very cold and it is believed to be an ice planet where animals adapted to cold climate was more. Hence, option 1 is correct.

The long time pattern of weather in an area is called climate. Climate changes with time and region to region. The different climates in earth is influenced by sun.

Different regions on earth experience different climate due to the varying distance from sun, and other factors such as air quality, presence of mountains, sea, etc.

Earlier days of earth was very much cold and it was known as ice age. This climate was because of the reduced temperature . Thus animals adapted to cold climate was there. Later earth changed to greenhouse period where the heat gradually increased and set into current state.

The fossils of earlier animals was deposited in the lower layer and that of continued age is upper layer. Hence, option 1 is correct. Where the earlier life was of cold climate.

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Answer:

unsalted butter

Explanation: because it lets the real natural flavor come through.

Answer:

Hydrogen ions

Explanation:

Answer:

concentration of hydrogen ion

Explanation:

Answer:

2.89× 10²³ atom   of Zn

Explanation:

Given data:

Number of moles of Zn = 0.48 mol

Number of atoms of Zn = ?

Solution:

Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atom

0.48 mol ×  6.022 × 10²³ atom / 1mol

2.89× 10²³ atom

Answer:

a

Explanation:

The force acting downwards or opposite to normal force which reduces the movement is indicated with a negative sign. Hence, the force of -7N is frictional force.

Force is an external agent acts on a body to change it from the state of rest or motion. There are various forces such as frictional force, magnetic force, gravitational force etc.

Frictional force is the resistive force which make the object resistive in motion. Thus it is indicated with a negative sign. Gravitational force is the force by which an object attracts other objects into its centre of mass.

Hence, gravitational force also making the body resistive to motion. Here, -10 N is the gravitational force acting on the box and it experience a force of -7N which also resists its force in the opposite direction of the normal force.

Hence, -7N is the force of  friction acting on the body.

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Answer:

false

Explanation:

false, only a small percentage of mutations cause genetic disorders—most have no impact on health or development. For example, some mutations alter a gene's DNA sequence but do not change the function of the protein made by the gene.

Answer: 98.08 g/mol

:))))))))

Answer:

8.757 x 10^23 molecules

Explanation:

Use Avogadro's number of  6.022 × 10 ^23  molecules per mole.

64g CO2/44.01 g/mol = 1.454 moles of CO2

1.454 x  6.022 × 10 ^23 =

8.757 x 10^23 molecules

Answer:

Chlorine (35.44 amu)

Explanation:

An unknown element is found to have three naturally occurring isotopes with atomic masses of 34.9689 (76.000%), 36.9659 (23.988%) and 35.9683 (0.012%).

We need to find the mass of the unknown element. When abundances is given, then atomic mass is given by :

[tex]M=34.9689 (76.000\%)+36.9659 (23.988\%) +35.9683(0.012\%)\\\\=34.9689 (\dfrac{76}{100})+36.9659 (\dfrac{23.988}{100}) +35.9683(\dfrac{0.012}{100})\\\\=35.44\ \text{amu}[/tex]

So, the atomic mass of the unknown element is 35.44 amu and it is chlorine.

Brainless answer:

I think it is ionic.. I am not sure

Hey there!:

density = 1.85 g/mL

volume = 78.0 mL

Mass = ??

therefore:

D = m / V

1.85 = m / 78.0

m = 1.85 x 78.0

m = 144.3 grams

Hope this helps!

Answer:

i hope it helps

Explanation:

The purpose of preparing the surface before beginning to plate another metal onto it is to ensure that it is clean and free of contaminants, which may interfere with the bonding. Contamination often prevents deposition and lack of adhesion. Normally this is done in three steps: cleaning, treatment and rinsing. Cleaning usually consists of using certain solvents such as alkaline cleaners, water, or acid cleaners in order to remove layers of oil on the surface. Treatment includes surface modification which is the hardening of the parts and applying metal layers. Rinsing leads to the final product and is the final touch to electroplating. Two certain methods of preparing the surface are physical cleaning and chemical cleaning. Chemical cleaning consists of using solvents that are either surface-active chemicals or chemicals which react with the metal/surface. In physical cleaning there is mechanical energy being applied in order to remove contaminants. Physical cleaning includes brush abrasion and ultrasonic agitation.

Answer:

3m/s²

Explanation:

Given parameters:

Mass of object  = 3.2kg

Force to the right = 16.3N

Force to the left  = 6.7N

Unknown:

Acceleration of the object  = ?

Solution:

To solve this problem, we use newtons second law of motion;

   Net force  = mass x acceleration

 Net force on object  = Force to the right  - Force to the left

 Net force  = 16.3N  - 6.7N  = 9.6N

    So;

         9.6  = 3.2 x a

              a = [tex]\frac{9.6}{3.2}[/tex]   = 3m/s²

Answer:

Even the most powerful light-focusing microscopes can't visualise single atoms. What makes an object visible is the way it deflects visible light waves. Atoms are so much smaller than the wavelength of visible light that the two don't really interact. To put it another way, atoms are invisible to light itself.

Explanation:

Can you give me Brainliest pls

And Your welcome :)

Answer:

The atoms are too small to see.

Explanation:

Hope my answer helped you!!

Answer:

the happen is a fraction of valence is a compalation of the electrons

Explanation:

yan yung answer ko sana makatulong