How many energy levels contain electrons in an atom of zirconium (Zr)?

Answer:

Fe₂O₃

Explanation:

To solve this question we must find the moles of Iron in 1.68g. With the difference of the masses we can find the moles of oxygen. The formula will be obtained with the ratio of both amount of moles:

Moles Fe:

1.68g * (1mol / 56g)  =0.03moles

Moles O:

2.40g-1.68g = 0.72g * (1mol/16g) = 0.045moles

The ratio O/Fe is:

0.045moles / 0.03moles = 1.5 moles. this ratio is obtained if the formula is:

Answer:

CH4 = Methane

CO2 = Carbon dioxide

There are two types of chemical compound one is covalent compound and another is ionic compound in chemistry. In ionic bonds, electrons are completely transferred. Therefore, the name of CH[tex]_4[/tex]  and CO[tex]_2[/tex]  are Methane and Carbon dioxide respectively.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

Covalent compounds are formed by covalent bond and ionic compounds are formed by ionic bond. Covalent bond is formed by sharing of electron and ionic bond are formed by complete transfer of electron. Ionic bonds are stronger than covalent bonds. The melting and boiling points are higher in ionic compounds.

chemical formula                                      Chemical name

CH[tex]_4[/tex]                                                           Methane

CO[tex]_2[/tex]                                                      Carbon dioxide

Therefore, the name of CH[tex]_4[/tex]  and CO[tex]_2[/tex]  are Methane and  Carbon dioxide respectively.

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Answer: Image result for What does Boyle's Law describe?

This empirical relation, formulated by the physicist Robert Boyle in 1662, states that the pressure (p) of a given quantity of gas varies inversely with its volume (v) at constant temperature; i.e., in equation form, pv = k, a constant.

Explanation:

Answer:

true

Answer:

A- In (NH4)3PO4  there are four ions in total as three ions of NH₄ and is one ion of PO₄

Answer and Explanation:

I believe −246.048 C or −411 F

Answer:

No, not well balanced

Explanation:

2Nacl+F2=2Naf+Cl2

Answer:

a)82.5 g

Explanation:

To solve this problem we will use Avogadro's number, which states the number of formula units per mole.

Then we convert 1.41 moles of NaCl to grams, using its molar mass:

The closest answer is option a).

Answer and Explanation:

For each reaction, it is useful to detail which are the reactants (left side of the equation) and which are the products (right side of the equation), to deduce the chemical formulas.

1. Solid lithium reacts with water to produce hydrogen gas and a solution of lithium hydroxide.

Reactants: lithium element in solid-state (Li(s)) and water (H₂O) in the liquid-state. Products: hydrogen gas which is a diatomic molecule (H₂) and lithium hydroxide, which is a base formed by lithium cation Li⁺ and OH⁻ anion (LiOH).

Li(s) + H₂O(l) → H₂(g) + LiOH(aq)

2. Solid sodium reacts with gaseous chlorine to produce sodium chloride.

Reactants: sodium metal in solid-state (Na(s)) and chlorine which is a diatomic gas (Cl₂). Products: sodium chloride, which is a salt formed by sodium and chloride together (NaCl).

Na(s) + Cl₂(g) → NaCl(s)

3. Solid calcium carbonate breaks down into carbon dioxide gas, oxygen gas, and solid calcium.

It is a decomposition reaction, so we have only one reactant: calcium carbonate, which is a salt composed of carbonate anion (CO₃⁻²) and calcium ion (Ca²⁺). Products: carbon dioxide (CO₂), oxygen gas which is diatomic (O₂), and solid calcium (Ca(s)).

CaCO₃(s) → CO₂(g) + O₂(g) + Ca(s)

4. Solid iron(II) sulfate and a solution of barium chloride react to form solid barium sulfate and a solution of  iron (II) chloride.

Reactants: iron(II) sulfate which is an ionic compound formed by the sulfate ion (SO₄²⁻) and iron ion (with two positive charges: Fe²⁺), and barium chloride which is a salt of barium ion (Ba²⁺) and two chloride ions (Cl⁻). Products: the salts formed by ion exchange, barium sulfate (BaSO₄), and iron (II) chloride (FeCl₂).

FeSO₄(s) + BaCl₂(aq) → BaSO₄(s) + FeCl₂(aq)

5. Solutions of hydrochloric acid and sodium hydroxide react to produce liquid water with sodium chloride  dissolved in it.

It is the classical neutralization reaction. Reactants: hydrochloric acid (HCl) and the strong base sodium hydroxide (NaOH). Products: water (H₂O) and the salt formed by the anion provided by the acid (Cl⁻) and the cation provided by the base (Na⁺): NaCl.

HCl(aq) + NaOH(aq) → H₂O(l) + NaCl(aq)

Answer:

Area of rectangular poster = [tex]\frac{3}{16}[/tex] yard²

Explanation:

P.S - The exact question is -

Given - A rectangular poster is [tex]\frac{1}{4}[/tex] yard wide and [tex]\frac{3}{4}[/tex] yard tall.

To find - What is its area ?

Proof -

We know that ,

The area of rectangle = Length × Breadth

Here,

Given that,

Length of rectangle = [tex]\frac{3}{4}[/tex] yard

Breadth of rectangle = [tex]\frac{1}{4}[/tex] yard

∴ we get

Area of rectangular poster = [tex]\frac{3}{4}[/tex] × [tex]\frac{1}{4}[/tex]  yard²

                                          = [tex]\frac{3}{16}[/tex] yard²

⇒Area of rectangular poster = [tex]\frac{3}{16}[/tex] yard²

Answer:

chemical change

Explanation:

electrolysis process by which electric current is passed through a substance to effect a chemical change.

Answer:

C

i) 2 C(s) + O2(g) → 2 CO

ii) Carbon monoxide poisoning occurs when carbon monoxide builds up in your bloodstream. When too much carbon monoxide is in the air, your body replaces the oxygen in your red blood cells with carbon monoxide. This can lead to serious tissue damage, or even death.

D

The iron oxide gets reduced.

The carbon gets oxidised.

E

the reason is that aluminium is more reactive than carbon to be extracted in a blast furnance.an element lying lower in the metal reactivity series can be reduced by carbon (a reducing agent) but aluminum lies above carbon metal series.

F

i) electrolysis.

ii) It is soft and malleable. Aluminium is used in a huge variety of products including cans, foils, kitchen utensils, window frames, beer kegs and aeroplane parts. This is because of its particular properties.

Explanation:

1. Find the empirical formula of a compound that has 36.84% of Nitrogen (N), 63.16% of Oxygen (O).

Secondly, Find molar mass of each component: N=14.0067, O=15.9994

Thirdly, convert to moles: N=2.6301698472874, O=3.9476480368014

Then find smallest mole value: 2.6301698472874

Divide all components my smallest value: N=1, O=1.5009099282591

Then divide by fractional component of each mole value: N=1.9963668986866, O=2.9963668986866

Round to closest whole numbers: N=2, O=3

Lastly, combine to get the empirical formula:N2O3

Answer:

There's no such thing as absolute zero

Answer:

I think number 1 but if wrong report me

Answer:

protons, neutrons

Explanation:

There are three subatomic particles in all atoms: protons, neutrons and electrons. Of these three, only protons and neutrons are considered to have enough mass to contribute to overall atomic mass of the element.

Answer:

true ........

hope it is helpful

Answer:

Typically found in eukaryotic cells, centrioles are cylindrical (tube-like) structures/organelles composed of microtubules. In the cell, centrioles aid in cell division by facilitating the separation of chromosomes. For this reason, they are located near the nucleus.

Answer:

no

Explanation:

Explanation:

Answer:

3.33M

Explanation:

M1V1=M2V2

M1 = 10M

V1=2L

V2=6L

M2 = M1V1/V2 = 10x 2/6 = 3.33 M

Answer:

Methane (CH4),Carbondioxide green house gases are carbon compounds

Carbon dioxide (CO2) and methane (CH4) are two powerful greenhouse gases produced by the carbon cycle.

Answer:

C

Explanation:

No change.

The total number moles of products = The Total number of reactants

Answer:

1200g H20.

Explanation:

Write out the balanced equation... when an organic compound is burned, like C2H2, it is burned in oxygen (O2) and produces Water and Carbon Dioxide (CO2)

so 2C2H2 + 5O2  =  2H2O  + 4CO2

now that you have a balanced equation just convert to moles and solve

2000g C2H2 * 1mol C2H2 / 30gC2H2 * 2mol H2O/2mol C2H2 * 18gH2O/1molH20 = 1200g H20.

Answer:

I think the answer is Prokaryote and Eukaryote

Explanation: