I didn’t get any help my recent question so I’m posting it again to see if anybody sees it this time
Question!!!
Determine half life exploration of isotopes

Answer:

The number of photoelectrons are increased

Explanation:

According to Albert Einstein, when light falls on a clean metal surface, electrons are ejected from the clean metal surface. This is known as photo electric effect.

The kinetic energy of the emitted photoelectron depends on the energy of the incident photon and the work function of the metal. If the energy of the incident photon is less than the work function of the metal, photoelectric effect does not occur.

Below a given threshold frequency or wavelength called the threshold frequency or threshold wavelength photoelectric effect does not occur.

However, doubling the photon flux of light doubles the intensity of the light. This only leads to increase in the number of photons and have nothing to do with the energy of the emitted photoelectrons.

Answer:

I believe that its B

Explanation:

google lol

Answer:

A). An atom is an indivisible hard-sphere.

Explanation:

The 'Atomic Theory' of Dalton is characterized as the earliest model(came in 1803) which described the atoms as the indivisible and resistant spheres. He used the example of watermelon to elaborate that the atoms of a specific element share similar characteristics and the atoms of distinct elements differ in their mass as well as their size. Thus, option A is the correct answer.

The statement that describes the earliest model of the atom is: A. An atom is an indivisible hard sphere.

An atom can be defined as the smallest, indivisible, basic unit of matter that forms all chemical elements.  Thus, an atom is the fundamental (basic) building blocks of matter i.e all physical and chemical substances.

Additionally, an atom defines or determines the structure of a chemical element.

Basically, an atom comprises three (3) main particles and these are;

The earliest (first model) of an atom was proposed by a notable English chemist called John Dalton. In the early 1800s, John Dalton adopted Democritus' theory to formulate the earliest (first model) of an atom.

Dalton's atomic theory described the atom of a chemical element as an impenetrable, movable, indivisible, very small (tiny) but movable hard sphere i.e it cannot be divided into subatomic or very tiny particles.

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Answer:

Explanation:

The correct answer is sodium (Na)

Answer: so the answer is A

Explanation: The relationship between an object's mass (m), its acceleration (a), and the applied force (f) is F=ma. ... This law requires that the direction of the acceleration vector is in the same direction as the force vectors.

Answer:

beta minus emission

Explanation:

Beta radiations:

Beta radiations are result from the beta decay in which electron is ejected. The neutron inside of the nucleus converted into the proton an thus emit the electron which is called β particle.

The mass of beta particle is smaller than the alpha particles.

They can travel in air in few meter distance.

These radiations can penetrate into the human skin.

The sheet of aluminum is used to block the beta radiation

²³⁹₉₃Np→ ²³⁹₉₄Pu + ⁰₋₁e

The beta radiations are emitted in this reaction. The one electron is ejected and neutron is converted into proton.

Answer:

True

Three-Dimensional Lattice

The unique arrangement of atoms or molecules within a crystalline solid is referred to as the crystal structure of that material. ... The crystal lattice represents the three-dimensional structure of the crystal's atomic/molecular components.

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Answer:

107.9g

Explanation:

Given parameters:

Molar mass of Cu  = 63.5g/mol

Molar mass of Ag  = 107.9g/mol

Mass of reacting Cu  = 31.75g

Unknown:

Mass of Ag produced  = ?

Solution:

The reaction equation is given as;

    Cu + 2AgNO₃ →  Cu(NO₃)₂ + 2Ag

The equation is balanced.

We start by find the number of moles of the known;

  Number of moles  = [tex]\frac{mass}{molar mass}[/tex]  

  Number of moles of Cu  = [tex]\frac{31.75}{63.5}[/tex]   = 0.5moles

From the balanced equation;

       1 mole of Cu produced 2 moles of Ag;

      0.5 mole of cu will produce 0.5 x 2 mole of Ag  = 1 mole of Ag

Now;

 Mass of Ag  = number of moles x molar mass

 Mass of Ag  = 1 mole of Ag x 107.9g/mol  = 107.9g

Answer:

107.9

Explanation:

Answer:

True

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Answer:

true

Explanation:

Weight is calculated accounting for gravity, which is why a person weighs less on the moon than on Earth.

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Answer:

something with one particle/atom

Explanation:

Answer:Plate Tectonics : Different Plate Boundaries Create Different Landforms and ... Plate Boundary: CONVERGENT ... As the MORE DENSE oceanic plate (OP) subducts under ... Illustration of what is happening ... Two continental plates (CP) move away from each other ... Sea Floor spreading occurs at these mid-ocean ridges.

Explanation:

The landforms created in the subducting plate boundary are mid ocean ridges, fold mountains and islands. Volcanoes and earth quakes are common in these regions.

Plate boundaries are regions of intersections between two tectonic plates. There are three different  type of plate boundaries, namely convergent boundaries, divergent boundaries and transform boundaries.

In convergent plate boundaries, two tectonic plates moves close to each other and converge. These plate boundaries gives rise to different types of land forms such as fold mountains, islands etc.

Earthquakes and volcanoes are common in convergent plate boundaries. These type of  plate movement is caused by the convection currents in the mantle.

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Answer:

Osmosis is the process that describes water moving through a membrane.

I am not sure about the second question.

Explanation:

Answer:

a. atoms are indivisible. ... atoms can not be destroyed in chemical reactions.

Explanation:

Hope this helped :D

Answer:

A pure metal is any metal that has not been joined with any other metal

Explanation:

Answer:

Be cause of The fat

Explanation:

It’s just fat

Answer:

The water absorbs the thermal energy of the fire.

Explanation:

Thermal energy a form of energy that is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other. It is a form of energy which involves the transfer of energy from regions of higher heat content to regions of lower heat content.

A burning wood fire has a higher heat content than water. Therefore, when water is thrown on a wood fire, the water will absorb the heat from the burning wood fire in order to raise its own heat content. since the wood fire has lost heat to water, it would eventually stop burning, whereas the water whose heat content has been raised may have some of its molecules absorbing so much heat that a change of phase occurs to the liquid phase.

Answer:

It all really depends on the side group the amino acid is on! For instance, out of the  20 side groups used to make proteins, there are only two main groups: polar and non-polar

Answer:

I’ll put the answer the comments if you can give the actual question

Explanation:

Answer: the atomic number is 11

Explanation: using a electron configuration chart you can see that 3s1 stops on Na which is 11 on the table

Answer:a metal loses electrons and becomes a positive ion

Explanation:

The answer option which describes a step in the process of formation of an ionic bond is: A. A metal atom loses electrons and becomes a positive ion.

In Chemistry, the three (3) fundamental types of chemical bonds are:

An ionic bond can be defined as a type of chemical bond which involves a metallic element transferring one or more electrons to a non-metallic element, in order to become a positive ion.

This ultimately implies that, the formation of an ionic bond typically involves a metal atom losing its electrons to a non-metallic element, in order to become a positive ion.

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Answer:

c

Explanation:

Diagram C represents active transport which is a type of facilitated diffusion.

Diffusion is defined as the process of movement of molecules which takes place under concentration gradient. It helps in movement of substances in and out from the cell.The molecules move from lower concentration region to a higher concentration region till the concentration becomes equal.

There are 2 main types of diffusion:

1) simple diffusion-process in which substances move through a semi-permeable membrane without the aid of transport proteins.

2) facilitated diffusion- It is a passive movement of molecules across cell membrane from higher concentration region to lower concentration.

There are 2 types of facilitated diffusion one is osmosis and dialysis.

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Answer:

Ca=2,8,8,2

Ne=2,8

S=2,8,6

Explanation:

bc Ca valance no is 20

Ne """""""""""""""""10

S """""”"""""""""* 16

Answer:

138g

Explanation:

According to this question, sodium reacts with chlorine to form sodium chloride as follows:

Na(s) + Cl(g) → NaCl (aq)

According to the law of conservation of mass, matter can neither be created nor destroyed, but can only be transferred from one form to another. This means that the mass of the reactants in a chemical reaction must equate the mass of products of that reaction.

Hence, If 76g of sodium reacts with chlorine to produce 214g of sodium chloride, this means that to obey the law of conservation of mass, the mass in grams of chlorine that reacted is 214g - 76g = 138g

In this sense, the combined 76g of sodium and 138g of chlorine (reactants) will equate the 214g of sodium chloride (products) in obeisance to law of conservation of matter.

Answer:

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Explanation:

Answer:

D

Explanation:

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Answer:

Covalent

General Formulas and Concepts:

Chemistry - Compounds

Explanation:

Step 1: Define

NCl₃ - Nitrogen Trichloride

Step 2: Identify

Nitrogen is a nonmetal

Chlorine is a Halogen Gas

Step 3: Confirm

Nitrogen and the 3 Chlorines will have to share electrons and form a Covalent bond.

Answer:

The bond is ionic.

Explanation:

If a nonmetal and a metal bond, it's known as a characteristic of an ionic bond.

The answer above is false, Google "Is nitrogen trichloride an ionic compound" in order to find out why.

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Answer:

Explanation:m

At 1 atm and 300 K, this gives n/V = 0.0406 mol/l. For air, which has a molar mass of 29.0 g/mol, this gives a density of 1.18 g/l. Helium, which has a mass of 4.00 g/mol, has a density of 0.164 g/l. Thus, a one-liter balloon of helium can lift a mass of (1.18-0.164) = 1.02 g. In science, the standard unit of mass is the kilogram (kg). A bowling ball has a mass of about 5 kilograms. Bowling ball weights range from 6 lbs. To 16 lbs. in most cases males will use weights ranging between 12 lbs. and 16 lbs. You might calculate volume using the sphere's radius, circumference or diameter. You can also submerge the sphere in water to find its volume by displacement. Once you know the volume, you can multiply by the density to find the mass.

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Answer: D

Explanation:

Answer:

C. Friction

Explanation:

Because friction needs contact to occur, the other forces do not require contact like friction does.