In 1983, a team of scientists discovered a fossilized bone of a giant bird when excavating land in
Brazil. After studying the fossil, the team thought that the bird was unique to South America but
had been extinct for millions of years. Many years later, another fossil from the same giant bird
was found in Nigeria. The two fossils were formed in rock that was very similar to one another.

The chemical formula for an ionic compound represents the ratio of the combined ions present in a sample.

A sample of an ionic compound doesn't represent a multiple of distinct molecules, like a sample of a covalent compound, where the chemical formula does represent the number of atoms in a single, differentiated molecule. Ionic compounds form crystal lattices where each positively charged cation is surrounded by negatively charged anions and vice versa. Thus, the chemical formula of an ionic compound merely describes the ratio of cations and anions present in the crystal lattice.
The total number of ions in the lattice can, on the other hand, be calculated using the mass of the sample and Avogadro's number.

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Answer:

Both are chemical changes and both are physical changes.

Explanation:

Milk can go sour in the fridge and I don't really know about the conserve mass one.

The approximate percent increase in carbon dioxide concentration        =38%

For this reason, researchers regularly take air samples at several distant locations across the globe, including one atop the Hawaiian volcano Mauna Loa, to gauge the average concentration of CO2 in the atmosphere. Since the 1950s, this website has monitored the atmospheric concentration of carbon dioxide.

Percentage increase = (Increase/original  value)×100

P.I.C= (ΔC/C₁)×100 ⇒ Equation 1

Where P.I.C = Percentage increase in the concentration of carbon dioxide from 1790 to 2007,

ΔC = increase in the concentration of carbon dioxide from 1790 to 2007,

C₁ = concentration of carbon dioxide in 1790.

But,

ΔC = C₂ - C₁ ⇒Equation 2

Substituting equation 2 into equation 1.

P.I.C = [(C₂ - C₁)/C₁]×100⇒Equation 2

Given: C₁ = 278 ppm, C₂ = 383 ppm

Substituting into equation 2

P.I.C = [(383-278)/278]×100

P.I.C = (105/278)×100

P.I.C = 37.77%

P.I.C ≈ 38%

The approximate percent increase in carbon dioxide concentration =38%

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The covalent compounds formed from the given elements are as follows:

Covalent compounds are compounds that are formed as a result of covalent bonds formed between atoms of different elements.

Covalent bonds are formed as a result of sharing of electrons between atoms of different elements usually non-metals.

Due to differences between the electronegativities of atoms of nom-metals, the electrons shared in covalent compounds are not always shared equally. Thus, several other intermolecular forces exist between molecules of covalent compounds.

Some of the intermolecular forces that exist in covalent compounds include:

Given the following elements: nitrogen, fluorine, oxygen, carbon, and hydrogen.

The covalent compounds that can be formed representing the given intermolecular forces are as follows:

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The ratio varies in different ionic compounds because different ionic compounds have different ratios of positive ions to negative ions.

An ordered grid of points known as a lattice is used to visualize how crystallizing particles are structured. The unit cell of the crystal is defined by the lattice points. The smallest part of a crystal, known as a unit cell, is repeatedly translated in three dimensions to create the whole crystal.

The crystal structure (or crystal lattice) of an ionic compound is determined by the size of the ions and the stoichiometry (ratio of cations to anions) of the ions. Many ionic compounds have variations in this ratio.

A recurring three-dimensional pattern of atoms or groups of atoms in a crystal is known as a crystal lattice structure.

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The density of the marble is  1.7kg/m³

Density is the amount of mass per unit of volume

Marcie fills a graduated cylinder with 15.0 mL of water (Vi) paul finds the mass of a marble to be 2.21g, then drops the marble into the graduated cylinder if the meniscus on the graduated cylinder is now at 16.3 mL (Vf)

We have to find density of the marble = ?

Volume = (Vi) -  (Vf) = 15.0 mL - 16.3 mL

Volume = 1.3mL

Mass =  2.21g

Density = mass/volume means ρ = m/V

Density = 2.21g /  1.3mL

Density = 1.7kg/m³

The density of the marble is  1.7kg/m³

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Answer:

9

Explanation:

The mass will only be 9 if there are 4 neutrons, hope this helps

An ionic equation is a chemical equation in which the electrolytes in aqueous solution are described as dissociated ions.

3FeSO4(aq) + 2K3PO4(aq) = Fe3(PO4)2(s) + 3K2SO4(aq)

ionic equation : 3Fe(2+)(aq) + 3SO4(2-)(aq)+ 6Na(+)(aq) + 2PO4 (3-) (aq) → Fe3(PO4)2(s)+ 6Na(+) + 3SO4(2-)(aq)

net ionic equation: 3Fe(2+)(aq)  + 2PO4 (3-)(aq) → Fe3(PO4)2(s)  

K2CO3(aq) + CdI2(aq) = 2KI(aq) + CdCO3(s)

net ionic equation for K2CO3(aq) + CdI2(aq) = 2KI(aq) + CdCO3(s).

2HNO3 + CaCO3 = Ca(NO3)2 + H2O + CO2

ionic equation :  CaCO3(s) + 2H+(aq) → Ca2+(aq) + CO2(g) + H2O()

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Answer:

The five main postulates of the KMT are as follows: (1) the particles in a gas are in constant, random motion, (2) the combined volume of the particles is negligible, (3) the particles exert no forces on one another, (4) any collisions between the particles are completely elastic, and (5) the average kinetic energy of ...

Explanation:

Answer:

Explanation:

a chemical reaction is a process in which the some substances go into reactant and some into products , the reactant molecule produce the new molecules in the form of product, it's also called the breaking of chemical bonds and forming the new bonds .

Based on the electroplating process video:

Electroplating is the process by which a metal is used to coat the surface of another substance.

The process of electroplating is done in order to improve the quality of the material being coated as well as to make it more durable.

In the video, the copper coins were plated with zinc by dipping the coins into a solution of sodium zincate.

The sodium zincate is prepared by dissolving powdered zinc in a sodium hydroxide solution.

The undissolved zinc powder in the solution will form a fine film of zinc over the copper making it looks shiny like zinc.

The zinc-coated coin is then held over a bunsen flame until it turns shiny gold.

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2 hydrogen ions (protons; H-) would need to bond with the carbonate anion to create carbonic acid.

One carbon-oxygen double bond and two carbon-oxygen single bonds make up the structure of carbonic acid, as can be seen from the example given above. One hydrogen atom is joined to each of the oxygen atoms involved in a single bond with the carbon.

In the dimers of carbonic acid, bifurcated hydrogen bonds frequently occur, creating a complicated picture with several orbital interactions of different intensities. The lowest energy dimers are made up of two anti-anti monomers interacting through the strongest C=OH-O hydrogen bonds.

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Answer:

I think the right answer was "because they have already formed bonds to become more stable"

Explanation:

the reason you got the question wrong was because not all unstable elements have to be bonded with a gas molecule. It could be a metal for example.

it's hard to find these unstable elements in natural nature because since they are so unstable, they can't "wait" so they form bonds as soon as they can when they get the chance.

nature isn't controlled by scientists too, so these unstable elements form bonds with almost anything possible when they have the chance to become more stable

0.4988699069454786 Moles of cobalt atoms are in 29.4 grams of cobalt.

In order to convert  grams of cobalt into moles of cobalt :

n = m / M,

n - number of moles.

m in grams  - specific mass.

M is the molar mass of this material.

n = 29.4 g / 58.933200 g/mol

n = 0.4988699069454786 moles

A mole is defined as 6.0221076 × [tex]10^{23}[/tex]  of any chemical unit, be it atoms, molecules, ions or others. A mole is a convenient unit to use because any substance has a large number of atoms, molecules or otherwise.

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The volume of fuel is 6 liters and the temperature is about 300 degrees. Gasoline laws relate to volume, strain, temperature, and amount of fuel. New fuel volume when the temperature drops to 200 ok: the old way to fine-tune gasoline. 273 ok (0°C) and pressure 1.00 atm.

Temperature is a measure of hot or cold expressed in many scales, including Fahrenheit and Celsius. Temperature indicates the route wherein heat energy will spontaneously waft—i.e., from a hotter body (one at a better temperature) to a colder frame (one at a decreased temperature). warmness is the overall energy of the motion of the molecules of a substance, while temperature refers back to the measure of the average energy of the motions of the molecules inside the substance.

Temperature is just a size that shows the average kinetic strength of one atom or molecule. hence, whilst we say something is hot or bloodless, we're normally using some other reference factor to outline the hotness and coldness of a frame. A thermometer is a tool that measures temperature. it can measure the temperature of a stable along with food, a liquid inclusive of water, or fuel along with air.

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Based on the freezing point depression value of HCl in benzene, HCl does not act as an electrolyte in benzene.

The freezing point of a solvent such as water is lowered by the solute which ionizes in it.

The freezing point of a solution depends on the number of particles in the solution.

The formula for freezing point depression is given below:

ΔTf = i * Kf * m

HCl remains as molecules and does not ionize in a solution of Benzene. This is because benzene is a nonpolar solvent.

Therefore, the equation for the dissolution of HCl in benzene is given below:

HCl (g) → HCl (in benzene solution)

1 mol of HCl gas gives 1 mol of HCl molecules in solution.

Therefore, HCl remains a molecule and does not act as an electrolyte in benzene.

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Fe(C 5H 5) 2 describes the organometallic compound ferrocene. The molecule is a complex made up of a core iron atom and two cyclopentadienyl rings.

AlCl3 is the chemical formula for aluminum chloride, sometimes referred to as aluminum trichloride.

Acetic acid is the source of the acyl chloride known as acetyl chloride.  AcCl is a frequent way to shorten its formula.

"81.3%"

One mole of ferrocene combines with one mole of acetyl chloride in accordance with the reaction's stoichiometry to produce one mole of mono acetylferrocene.

The limiting reagent is the one that is minimally present. Ferrocene is the limiting agent as a result.

The limiting reagent controls how the product is formed. So,

In a reaction, one mole of ferrocene yields one mole of mono acetylferrocene.

reaction forms with 0.0005375 moles of ferrocene Mono acetylferrocene, 0.0005375 mole

0.0005375 moles of product were produced.

Mono acetylferrocene's molar mass is 228.07 g/mole.

Produced mono acetylferrocene mass equals moles times molecular weight, or 0.0005375 x 228.07 g, or 0.123 grammes, or 123 mg.

assuming a 100 mg experimental yield

% yield is equal to (Experimental Yield / Theoretical Yield) / 100, which equals (100/ 123) / 100, or 81.3%.

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The answer is 22.98977. We assume you are converting between grams Na and mole.

Answer: The density of a substances is generally known as mass per unit volume. And The SI unit is Kg/m3. Mass Versus Weight: Always there is confusion in people between mass and weight. Actually, the mass of an object is referred to its weight. In the scientific concepts mass refers loosely to the amount of matter in an object.

Explanation:

Answer:

28 g

Explanation:

d = m/V

m = dV = 10.5 x 56.0 = 28 g

Answer

b. 4.2 x 10²⁴

Explanation

Given:

Moles of H2O = 7 moles

Avogadro's Number is 6 x 10²³

What to find:

The number of articeles of H2O present in 7 moles of H2O.

Solution:

1 mole f any substanc contains 6 x 10²³ partcicles

Therefore 7 moles of H2O will contain

The correct answer is option:

b. 4.2 x 10²⁴

Answer:

C

Explanation:

ostriches are classified as diurnal

Answer: The answer is diurnal!

Explanation: Nocturnal animals, such as the owl or bat, stay awake during the night and sleep during the day! Which for diurnal animals, they sleep during the night, and roam around during the day! Such as us humans are both because some people may work during the night and sleep during the day! The most common for humans is us sleeping at night though and awake during the day!

The pressure of the CO₂ collected in atm is 0.965 atm.

We need to know about pressure to solve this problem. Pressure is unit that describe how much force applied on a surface area. It can be determined as

P = F / A

where P is pressure, F is force and A is area.

From the question above, we know that

Pvapor = 18.65 torr

P = 752 torr

From partial pressure, we can conclude that

P = Pco₂ + P vapor

752 = Pco₂ + 18.65

Pco₂ = 752 - 18.65

Pco₂ = 733.35 torr

Convert to atm

Pco₂ = 733.35 torr

Pco₂ = 733.35/760 atm

Pco₂ = 0.965 atm

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Among the given options, the derived unit is Newton. Option d is correct.

Derived units are measure units that have been derived from more than one base unit. Also understood as the units derived from the fundamental units. They either lack dimension or are the products of base units, like derived unit of force is Newton. A total of 22 derived units exist. The basic 7 derived units are Length is meter(m), Mass is  kg (kilogram) ,Time is s (second), Electric Current is  A (Ampere) ,Thermodynamic Temperature is  K (degrees Kelvin) ,Amount of Substance is mol (mole) and Luminous Intensity is  cd (candela)

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The Fischer Esterification method is used to accomplish this preparation of isopentyl acetate.

The Fischer esterification is an alternative esterification mechanism that uses an equilibrium process. It is standard procedure to use an excess of one of the reactants, often alcohol or acid, to alter the equilibrium in a way that facilitates the synthesis of esters. Since acetic acid is less costly and more readily removed than alcohol, we will use a lot of it in the current procedure.

Another strategy to trigger a reaction to its products is to remove one of the products as it forms. In this experiment, we will completely remove the water produced in the reaction by directly adding silica beads to the reaction vessel and using a drying tube with a drying agent (calcium chloride), which forbids the entrance of moisture into the reaction.

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Answer:

1 mole of Barium Nitrate has One mole of Barium ions, two moles of Nitrate ions

The terms change of phase and change of state are synonymous. A change in phase is always accompanied by a change in heat. However, the temperature remains constant. When we heat a solid, the energy supplied is used to increase the kinetic energy of its molecules, resulting in an increase in temperature.

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Answer:

C

Explanation:

When Beta decay happens, the atomic number of an element goes up, and that means there is an extra proton. A is not the answer because unstable atoms cause decay. B is also not correct because this is what happens in Beta decay: a neutron becomes a proton. D is not correct because an electron is actually emitted from the nucleus.

Answer:

The correct answer is B. An atom has many fewer protons than neutrons.

I just took the test.

Explanation: