When iron reacts with oxygen, it forms iron oxide, or rust.

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:

bromine, iodine, chlorine, flourine

Explanation:

thdy are all diatomic elements- meaning they can only exust with 2 elements. other diatomic elements include: (theres 7 btw)

-Bromine

-Iodine

-Nitrogen

-Chlorine

-Hydrogen

-Oxygen

-Flourine

Answer:

Explanation:

The correct answer is sodium (Na)

Answer: 8.31

Explanation: they told me it was correct

The value of R for 4.00 moles of an ideal gas at 25°C, 100L of volume and pressure of 99.1 kPa is 99.1 kPa.L / mol.°C.

Ideal gas equation is a hypothesis which tells about the behavior of gas at different conditions and it is represented as:

PV = nRT, where

P = pressure of ideal gas = 99.1 kPa

V = volume of ideal gas = 100 L

n = moles of ideal gas = 4 moles

T = temperature ideal gas = 25 °C

R = universal gas constant = ?

On putting these values on the above equation, we get

R = (99.1)(100) / (4)(25)

R = 99.1 kPa.L / mol.°C

Hence value of R for ideal gas is 99.1 kPa.L / mol.°C.

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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:

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:

a

Explanation:

is my lucky guess im sorry if im wrong good luck

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:

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:

vinegar is acidic

water should be neutral but people say since it's pH 7,it will be more alkaline

salt solution is acidic

lemon juice is acidic

sugar solution is alkaline

soap is alkaline

Methyl orange will turn red with grapefruit juice.

Methyl orange will turn yellowish orange or lemme say red with oven cleaner

The addition of pure water to methyl orange will not have an effect on the color and the solution will still be around neutral pH and yellow in color.

Explanation:

Working on number 7

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: 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:

The history of water supply and sanitation is one of a logistical challenge to provide clean water and sanitation systems since the dawn of civilization. Where water resources, infrastructure or sanitation systems were insufficient, diseases spread and people fell sick or died prematurely.

Explanation:

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:

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:

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:true

Explanation:

This statement is correct

Answer:

D

Explanation:

usa testprep!!!!!

Answer:

b). silver (Ag)

Explanation:

If you look at the periodic table, you just need to look at the atomic number of the element, because the atomic number tells you how many protons there are in the nucleus of the element.

But do be careful because some periodic tables have the molar mass at the top left corner, but the one I use has the atomic number at the top left corner, so make sure you look for the atomic number and not the molar mass.

Answer:

I had a amazing thanksgiving thanks for asking

Explanation:

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:

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:

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: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:

J.J.Thomson discovered negatively charged particles by cathode ray tube experiment in the year 1897. The particles were name electrons.