5. _______H2O2 → ________ H2O + O2

a. 2, 3
b. 2, 1
c. 2, 4
d. 2, 2



6. _______ Ca + N2 → Ca3N2


a. 2
b. 3
c. 4
d. 6


7. _______Li + F2 → ______LiF


a. 2, 2
b. 2, 1
c. 2, 3
d. 2, 4


8. _______Mg + N2 → Mg3N2


a. 2
b. 3
c. 4
d. 6


9. ______NH3 → ______N2 + ______H2


a. 2, 2, 2
b. 2, 2. 3
c. 2, 3, 2
d. 2, 4, 2


10. ______HCl → H2 + Cl2


a. 2
b. 3
c. 4
d. 6

Answer:

The answer should be A. Adding carbon to iron makes it tougher and stronger.

The addition of carbon atom to iron metal, enhances the property of hardness of metal.

Alloy is a compound which is formed by the mixture of two or more than two metals with different properties to make a new compound with better properties.

When we add carbon atom in the iron metal, it deviates the crystal lattice property of iron and makes it more harder. So, the content of carbon in the iron is directly proportional to the hardness of iron metal.

Hence, option (A) is correct i.e. hardness.

To know more about hardness, visit the below link:
https://brainly.com/question/18173707

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Answer:

2 only is a pretty accurate answer the others dont make sense  to me.

Explanation:

Answer: determine how they break

Explanation: :)

Answer: The nuetron was

Explanation: sorry is this is incorrect but im

99% its right

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Answer:

0.30

Explanation:

Provided that the volume and pressure remains constant

[(Pressure of cyclopropane)/ (Pressure of Oxygen)] = [(no. Of moles of cyclopropane)/(no. Of moles of Oxygen)]

Pressure of cyclopropane= 170. torr

Pressure of Oxygen= 570. torr

If we substitute the values

[(no. Of moles of cyclopropane)/(no. Of moles of Oxygen)] = 170/570

[(no. Of moles of cyclopropane)/(no. Of moles of Oxygen)] = 0.30

Hence, the ratio of the moles of oxygen to the moles of cyclopropane in the mixture is 0.30

Answer:

Maybe (C)

...............

Answer:

A. plates move in faster

Explanation:

The convergence is a process where both the plates tend to move in closer as one plate overrides the other and the formation of a Himalayas is described as a range that formed by the movement of the sediments that were bought by the Tethys sea. By the collision of the Indian and the Eurasian plate.

i hope this helps

Answer: The components are Strontium (Sr) and Phosphorous (P). The symbol for the element that forms the positive cation is [tex]Sr^{2+}[/tex]. The symbol for the element that forms the negative anion is [tex]P^{3-}[/tex]. The subscript on the cation in the neutral formula is 3 and the subscript on the anion in the neutral formula is 2.

Explanation:

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.

Here in strontium phosphide , element strontium is having an oxidation state of +2 called as [tex]Sr^{2+}[/tex] cation and element phosphorous [tex]P^{3-}[/tex] is an anion with oxidation state of -3. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral strontium phosphide [tex]Sr_3P_2[/tex]

Answer:  

I think F

Explanation:

Answer:

56/hr

Explanation:

Answer:

Glucose = C6H12O6

molecular mass = 6(12) + 12(1) + 6(16)

= 72 + 12 + 96

= 180 g

Explanation:

Glucose has a chemical formula of: C6H12O6 That means glucose is made of 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms. ... Glucose is produced during photosynthesis and acts as the fuel for many organisms.

Answer: A. [tex]7,+7[/tex]

Explanation:

Valence electrons are the number of electrons constituting the outermost shell of an atom. It is also defined as the electrons that take part in the formation of a chemical bond.

The atomic number of chlorine is 17 as it has 17 protons and the electronic configuration will be 2,8,7. Thus the electrons present in the outermost shell are 7 and hence the valence electrons are 7.

Effective nuclear charge is the net positive charge experienced by valence electrons. It is calculated by: Zeff = Z – S

where Z = atomic number , S = number of shielding electrons.

Thus for Chlorine , [tex]Z_{eff}=17-10=7[/tex]

Answer:

Boat p

Explanation:

Answer:

boat p

Explanation:

Answer:

D

Explanation:

I just did it on Edge

Answer:It’s D

Explanation: It was in my test

Answer:

0.847 molecule.

Explanation:

From the question given above, the following data were obtained:

Mass of X₄Z₃ = 3.93×10¯²² g

Number of molecules of X₄Z₃ =?

Avogadro's number = 6.022×10²³ molecules

Next, we shall determine the molar mass of X₄Z₃. This can be obtained as follow:

Molar mass of X₄Z₃ = (4×59.45) + (3×13.84)

= 237.8 + 41.52

= 279.32 g/mol

Finally, we shall determine the number of molecules in 3.93×10¯²² g of X₄Z₃. This can be obtained as follow:

From Avogadro's hypothesis,

1 mole of X₄Z₃ = 6.022×10²³ molecules

But 1 mole of X₄Z₃ = 279.32 g

Thus we can say that:

279.32 g = 6.022×10²³ molecules

Therefore,

3.93×10¯²² g = 3.93×10¯²² × 6.022×10²³ / 279.32

3.93×10¯²² g = 0.847 molecule.

Thus, 3.93×10¯²² g of X₄Z₃ contains 0.847 molecule.

Answer:

Explanation:

When calcium hydroxide is dissolved in water , it ionizes as follows .

Ca( OH)₂ = Ca⁺² + 2 OH ⁻

When it is dissolved in water which contains minimal OH⁻ , so there is almost no common ion effect . Hence calcium hydroxide is fully dissolved in pure water solvent .

When 1.00 mole sample of solid calcium hydroxide is added to 500.0 mL of 0.500 M sodium hydroxide solution in beaker , it is not fully dissolved due to common ion of hydroxide ion ( OH⁻ )

NaOH = Na⁺ + OH⁻

OH⁻ ion from NaOH , suppresses the dissolution of calcium hydroxide .

Similarly

When A 1.00 mole sample of solid calcium hydroxide is added to 500.0 mL of 0.200 M sodium hydroxide solution in beaker , it is not fully dissolved due to common ion of hydroxide ion ( OH⁻ )  

NaOH = Na⁺ + OH⁻

OH⁻ ion from NaOH , suppresses the dissolution of calcium hydroxide

When 1.00 mole sample of solid calcium hydroxide is added to 500.0 mL of 0.200 M calcium nitrate solution , it is not fully dissolved due to common ion of calcium  ion ( Ca⁺² )

Ca( NO₃)₂ = Ca⁺² + 2NO₃⁻

Ca⁺²  ion from Ca( NO₃)₂ , suppresses the dissolution of calcium hydroxide .

Answer:

Okay here's the answer ↓

Step-by-step explanation:

Tropical climate is one of the five major climate groups in the Köppen climate classification. Tropical climates are characterized by monthly average temperatures of 18 ℃ (64.4 ℉) or higher year-round and feature hot temperatures. Annual precipitation is often abundant in tropical climates, and shows a seasonal rhythm to varying degrees. There are normally only two seasons in tropical climates, a wet season and a dry season. The annual temperature range in tropical climates is normally very small. Sunlight is intense because they are receiving direct sunlight.

Answer:

True

Explanation:

Weather is short term, climate is over the long term

Answer:

true, different weather patterns are found all around the world at different times, there could be a hurricane in the gulf of mexico and as a result of the storm tornadoes could break out in texas

Explanation:

Answer:

369 ml

Explanation:

Mass of Aluminium (Al) = 20 g

Molar concentration =  2.007M

Molar concentration = Number of moles / Volume

The relationship between mass and number of moles;

Number of moles = Mass / Molar mass

Number of moles = 20 / 27 = 0.741 mol

2.007  = 0.741  / Volume

Volume = 0.741 / 2.007 = 0.369 L

converting to millilitres by multiplying by 1000

Volume = 0.369 * 1000 = 369 ml

Answer:

CH

Explanation:

CH, a typical sample of the compound contains one atom of carbon (C) to one atom of hydrogen (H).

Answer: 0.377 moles of calcium chloride will be formed.

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]    

[tex]\text{Moles of} Ca(OH)_2=\frac{27.9g}{74g/mol}=0.377moles[/tex]

The balanced chemical reaction is:

[tex]Ca(OH)_2+2HCl\rightarrow CaCl_2+2H_2O[/tex]  

According to stoichiometry :  

As 1 mole of [tex]Ca(OH)_2[/tex] give = 1 mole of [tex]CaCl_2[/tex]

Thus 0.377 moles of [tex]Ca(OH)_2[/tex] give =[tex]\frac{1}{1}\times 0.377=0.377moles[/tex]  of [tex]CaCl_2[/tex]  

Thus 0.377 moles of calcium chloride will be formed upon the complete reaction of 27.9 grams of calcium hydroxide with excess hydrochloric acid

Answer:

Protons are positive, electrons are negative, neutrons have to charge. Most of an Atoms mass comes from its protons and neutrons

Explanation:

I took some notes in my notebook about Atoms.

Answer:

Statement 2 (The molecule is made up of chromosomes)

Explanation:

This question is describing DNA, as the biological molecule. DNA is a type of nucleic acid that functions in the storage of genetic information in the cell. This means that contained in the DNA, are segments that code for proteins called GENES. It is contained in the nucleus of eukaryotic cells where it is wrapped around structures called CHROMOSOMES.

BASED on the four statements given by the student, which happens to be characteristics of this molecule, the statement 2, which states that the molecule is made up of chromosomes needs to be revised to make it true. This is because DNA is not made up of chromosomes but rather DNA is contained in chromosomes.

Answer:

Only 4 %

Explanation:

Just about 4 percent of the known universe overall mass consists of atomic nuclei and is therefore described by chemical components. This proportion is around 15 percent of the total mass, with dark energy becoming the majority of the material .

Answer:

the answer is 64 moths are dark

Answer:

Octanol at sea level> Octane at sea level > Octane at high altitude > Hexane at high altitude

Explanation:

Let us have it behind our minds that the boiling points of alkanes depends on the length of the alkyl chain. The longer the chain length, the higher the boiling point of the alkane.

Also, octanol has hydrogen bonding between its molecules in addition to dispersion forces, hence it has a higher boiling point than octane and hexane at sea level.

So, the order of boiling points required at the specified altitudes is;

Octanol at sea level> Octane at sea level > Octane at high altitude > Hexane at high altitude