ch4+o2 > CO2+H2O
what's the balance

Density can be defined in terms of the mass of a substance present in a certain volume.

i.e. Density = Mass/ volume

It helps classify and identify matter due to the following reasons:

1) Density is an intensive property. For a given substance the density will remain the same irrespective of the amount in which it is present.

For example: The density of Aluminum (Al) = 2.7 g/cm3. This value is a constant at a certain temperature and pressure. Therefore, the density will remain the same for 1 kilogram or 1 mg of Al

2) Different elements/compounds have different values of densities which is characteristic of that substance

The answer would be D.) Genetic Engineering

Shrimp burrow which is one of the examples of trace fossils.

Answer:

Option (1)

Explanation:

Trace fossils are defined as those traces such as the impressions and signs of ancient remains of an organism, that are found over relatively softer sediment.  

These play a very important role in the field of paleontology as it provides information about the ancient organism that lived in the past in a particular location.

Some of the examples of trace fossils are track and trails, burrows, footprints, cast and mold.

Shrimp burrows are an example of trace fossils, which are made by the marine organisms named shrimps, that are usually found at the bottom of the ocean.

Thus, the correct answer is option (1).

This is a combustion reaction because it is being combined with oxygen. Then to balance you will put the number of carbons you have or 4 in front of the CO2 and then same with H2. Then you will add up the oxygen and divide it by two to get. 1, (13/2), 4, 5

Answer : The correct option is, Antacid and toothpaste.

Explanation :

The property of an acid is that they are sour in taste and the property of base is that they are bitter in taste.

In the given question, vinegar, orange juice are the acids and antacids, toothpaste are the bases.

Therefore, the option Antacid and toothpaste are likely to have a bitter taste.

Answer :

In general trend,

The size of the element increases as we go down in a same group.

And the electronegativity of the element decreases as we go down in a same group.

For example : The two elements Magnesium and Calcium in a same group number 2.

The size of calcium is greater than the magnesium because as we go down in a group the atomic radius increases and the size also increases. And the electronegativity of calcium is less than the magnesium because as we go down in a group the electronegativity decreases.

Answer: [tex]2MgI_2+Mn(SO_3)_2\rightarrow 2MgSO_3+MnI_4[/tex]

Explanation:

Double displacement reaction: it is a chemical reaction in which the reactants  exchanges their ions to form new compounds as a products.

[tex]AB+CD\rightarrow AD+CB[/tex]

All the reaction are example of double displacement reaction beside reaction where magnesium iodide is reacting with manganese(II) sulfate to give magnesium sulfate and manganese(IV) iodide .

[tex]2MgI_2+Mn(SO_3)_2\rightarrow 2MgSO_3+MnI_4[/tex]

In this reaction , charge on manganese have changed from 2+ to 4+.  Manganese in getting oxidized. Example of an oxidation reaction. Hence, this reaction is not an example of double displacement reaction.

Answer: The given element is non-metal and the number of valence electrons are 7

Explanation:

There are 2 types of elements in the periodic table:

Valence electrons are defined as the electrons which are present in the outermost shell of an atom. Outermost shell has the highest value of 'n' that is principal quantum number.

We are given:

Fluorine is the 9th element of the periodic table having electronic configuration of [tex]1s^22s^22p^5[/tex]

This element will gain 1 electron to form [tex]F^-[/tex] ion

Number of valence electron in fluorine element = 2 + 5 = 7

Hence, the given element is non-metal and the number of valence electrons are 7

The balanced reaction is:  

2C4H10 + 13O2 --->  8CO2 + 10H2O

9.7g     +     34.7g    =     29.3g   +    -------g

Total mass of reactants = total mass of products

44.4g = 29.3 + g of water

44.4 - 29.3 = g of water

15.1g = g of water

grams of water produced here is 15.1g

In a butane lighter, 9.7 g of butane reacts with 34.7 g of oxygen to form 29.3 g of carbon dioxide. To determine the mass of water formed, we need to calculate the moles of carbon dioxide produced and then use the balanced chemical equation to determine the moles of water formed.

In a butane lighter, 9.7 g of butane reacts with 34.7 g of oxygen to form 29.3 g of carbon dioxide.

To determine the mass of water formed, we need to calculate the moles of carbon dioxide produced and then use the balanced chemical equation to determine the moles of water formed.

From the balanced equation:

2 C4H10 + 13 O2 → 8 CO2 + 10 H2O

Based on the equation, for every mole of carbon dioxide formed, we have 10/8 moles of water. Therefore, the moles of carbon dioxide produced can be calculated as:

Moles of CO2 = (mass of CO2 / molar mass of CO2)

The mass of water formed can then be calculated as:

Mass of H2O = (moles of CO2) * (molar mass of H2O)

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Answer : The chemical formula for aluminum fluoride is [tex]AlF_3[/tex]

Explanation :

Ionic compound : It is defined as the compound which is formed when electron gets transferred from one atom to another atom.

Ionic compound are usually formed when a metal reacts with a non-metal.

The nomenclature of ionic compounds is given by:

1. Positive ion is written first.

2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.

3. In case of transition metals, the oxidation state are written in roman numerals in bracket in-front of positive ions.

The given compound is, aluminum fluoride.

Aluminum fluoride is an ionic compound because aluminum element is a metal and fluorine element is a non-metal. The bond formed between a metal and a non-metal is always ionic in nature.

The charge on aluminum is (+3) and the the charge on fluorine is (-1). Both combine with the an ionic bond by the criss-cross method. Thus, the formula of the compound potassium chloride will be [tex]AlF_3[/tex]

Hence, the chemical formula for aluminum fluoride is [tex]AlF_3[/tex]

The chemical formula for aluminium fluoride is AlF₃. Therefore, option C is correct.

A chemical formula is a notation that represents the composition of a chemical compound. It uses chemical symbols and subscripts to indicate the types and number of atoms present in the compound.

In the chemical formula, the chemical symbols of the elements are used to represent the different types of atoms. Subscripts are used to indicate the number of atoms of each element in the compound. They are written as small numbers to the right of the chemical symbol.

Learn more about chemical formula, here:

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your answer should be the last one: models should be used when needed to explain or predict data being represented.

hope this helps :)

Answer : The final temperature of the gas must be [tex]33.596^oC[/tex]

Solution : Given,

Initial volume of gas = 2.49 L

Final volume of gas = 4.29 L

Initial temperature of gas = [tex]19.5^oC[/tex]

According to the Charles' law, the volume of gas is directly proportional to the temperature of the gas at constant pressure.

[tex]V\propto T[/tex]

[tex]\frac{V_1}{V_2}=\frac{T_1}{T_2}[/tex]

Now put all the given values in this formula, we get the final temperature of the gas.

[tex]\frac{2.49L}{4.29L}=\frac{19.5^oC}{T_2}[/tex]

By rearranging the term, we get

[tex]T_2==33.596^oC[/tex]

Therefore, the final temperature of the gas must be [tex]33.596^oC[/tex]

Answer : the statement that is true about the atom is It is present in the second group of the periodic table.

Explanation :

The Lewis dot model shows the number of valence electrons present in the atom.

Since the given metal has 2 dots, it indicates that the metal atom must have 2 electrons in its outermost shell.

Therefore option 2 : It has two electrons in the innermost energy level, is wrong because it contains 2 electrons in the outermost energy level

Option 1 : It is most likely to form covalent bonds is also wrong because a metal atom always forms ionic bond

Option 3 : It requires six other atoms to form a stable compound, is also wrong as the metal can form a stable compound by donating its 2 electrons to a non metal.

On periodic table, representative elements are arranged in groups based on their valence electrons. Therefore by knowing the outermost electrons, we can predict the group in which the element can be categorized.

Since the given metal atom contains 2 electrons, it must be present is second group.

Therefore the statement that is true about the atom is It is present in the second group of the periodic table.

According to the Law of Conservation of Mass,

The mass of the products in a chemical reaction must equal the mass of the reactants.

∴ D is the Answer

Answer:

D) the mass of the reactants always equals the mass of the products

Explanation:

I got this right during a test :)

H2O2 i think this is it

H2O2 i believe is the answer sorry if im wrong

6.69 g.

Make sure the chemical equation is balanced:

[tex]6\; \text{Li}\; (s) + \text{N}_2 \; (g) \to 2\; \text{Li}_3\text{N}\; (s)[/tex]

Assuming that one mole of N₂ is consumed. How many grams of each reactant will that take? Refer to a periodic table for data on atomic mass.

4.00 grams of each reactant are available. How many moles of N₂ can they consume?

However, only 0.09606 moles of the reaction is possible, since Li would have ran out before all 4.00 grams of N₂ are used up.

Each mole of the reaction makes 2 moles of Li₃N. 0.09606 moles of the reaction will produce 0.09606 × 2 × (3 × 6.94 + 14.01) = 6.69 grams of Li₃N.

Answer: The mole ratio of D : A is 3 : 2.

Explanation: Mole ratio for a chemical reaction is the ratio of their respective stoichiometric numbers or the ratio of their moles in a chemical reaction.

For a given chemical reaction:

[tex]2A+B\rightarrow C+3D[/tex]

By stoichiometry,

2 moles of A is reacting with 1 mole of B to produce 1 mole of C and 3 moles of D.

So, Mole ratio of D is to A will be 3 : 2

Answer:  D : A is 3 : 2.

Explanation:

The law of definite proportion is being used here. The law states that a given compound always has the same proportion of its constituent elements by mass. The numbers written in the equation are used to balance it, which is an important part whilst determining the mole ratio

Keeping in mind law:

2a + b => c + 3d

Using the concept of stoichiometry coefficients of d and a  

So the ratio of d:a is 3:2

The mentioned molecule with formula, CH₃NO where no bond is found between N and O can be depicted as formamide is shown in the attachment below.  

The formal charges = Number of valence electrons for the atom (V) - the number of electrons in lone pairs (N) - 1/2 (number of electrons in bond pairs, B)

FC = V - N - B/2

Thus, there is a need to calculate valence electrons, electrons in lone pairs, and the number of electrons in bond pairs for each atom in the mentioned molecule.  

V or valence electrons on C = 4e, on H = 1e, on N = 5e, and on O = 6e.  

N or electrons in lone pairs on C = 0e, on H = 0e, on N = 2e, and on O = 4e.  

B or number of electrons in bond pairs for C = 8e, for H = 2e, for N = 6e, and for O = 4e.  

Thus, the formal charges for each will be,  

C = 4 - 0 - (8/2) = 0

H = 1 - 0 - (2/2) = 0

N = 5 - 2 - (6/2) = 0

O = 6 - 4 - (4/2) = 0

Lewis dot structure for the given molecule is given in the attachment below:

Answer :  The Lewis-dot structure of [tex]CH_3NO[/tex] is shown below.

Explanation :

Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.

In the Lewis-dot structure the valance electrons are shown by 'dot'.

The given molecule is, [tex]CH_3NO[/tex]

As we know that carbon has '4' valence electrons, hydrogen has '1' valence electron, nitrogen has '5' valence electrons and oxygen has '6' valence electrons.

Therefore, the total number of valence electrons in [tex]CH_3NO[/tex] = 4 + 3(1) + 5 + 6 = 18

According to Lewis-dot structure, there are 12 number of bonding electrons and 6 number of non-bonding electrons.

Now we have to determine the formal charge for each atom.

Formula for formal charge :

[tex]\text{Formal charge}=\text{Valence electrons}-\text{Non-bonding electrons}-\frac{\text{Bonding electrons}}{2}[/tex]

[tex]\text{Formal charge on O}=6-4-\frac{4}{2}=0[/tex]

[tex]\text{Formal charge on C}=4-0-\frac{8}{2}=0[/tex]

[tex]\text{Formal charge on N}=5-2-\frac{6}{2}=0[/tex]

[tex]\text{Formal charge on }H_1=1-0-\frac{2}{2}=0[/tex]

[tex]\text{Formal charge on }H_2=1-0-\frac{2}{2}=0[/tex]

[tex]\text{Formal charge on }H_3=1-0-\frac{2}{2}=0[/tex]

Hence, the Lewis-dot structure of [tex]CH_3NO[/tex] is shown below.

1. c. ionic___ NaCl .  

2. a.covalent___CO2

3. b.metallic ___ZnCu

False. <--- This is wrong I was thinking of atoms

Molecules do expand when they slowdown...

Hello.

The answer: A. True.

When mouecules slow down they can expend and this is how gas is made.

Have a nice day.

Villi are tiny finger like projections present in the inner epithelial lining of the intestine. Each finger like villi is further divided into microvilli, which is the extension of plasma membrane of each epithelial cell of the villi. These villi and microvilli present on the inner surface of the intestine provide a greater surface area and this enhances the digestion and absorption of the nutrients.

Therefore, the correct answer is false as a microvilli is the tiny finger like projection of the inner epithelial cells of the small intestine that has absorptive functions.

Most covalent compounds have relatively low melting points and boiling points.

Covalent compounds usually have lower enthalpies of fusion and vaporization than ionic compounds.

Covalent compounds tend to be more flammable than ionic compounds.

Covalent compounds are characterized by their lower melting and boiling points, poor conductivity, varied solubility in water depending on molecular polarity, and being typically gases or liquids at room temperature. These properties stem from the sharing of electrons between nonmetallic elements, forming covalent bonds.

Covalent compounds exhibit unique characteristics due to the sharing of electrons between nonmetallic elements. These shared electrons create bonds that are central to the distinct properties of covalent compounds. A deeper understanding of these properties highlights the differences between covalent and ionic compounds.

Key Properties of Covalent Compounds

In essence, covalent bonding results in compounds with distinct physical states and functionalities, emphasizing the diversity of chemical compounds and their varied applications.

this equation does support the law of conservation of mass.

Copper does not react with HCl acid, but copper oxide does react. A metal-acid reaction is always a redox reaction. Since copper has a higher reduction potential than hydrogen, it does not react with non-oxidising acids like HCl or dil.H2SO4.

This answer varies. It would be B. because it's a large pot of water ( made of steel, iron or whatever ) and since it's a good conductor, it would transfer heat energy to the water and keep it warm.

It may not be A. because it's a small cup and the more molecules or matter it has the more thermal energy so it likely they would both be the same temperature.

Hope that helps.