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3 years ago

3. The chemical formula of a compound does NOT indicate _____.

Chemistry

2 answers:

mamaluj [8]3 years ago

6 0

Answer:

Im pretty sure its 2 How elements are joined in the compound

Explanation:

Artyom0805 [142]3 years ago

3 0

Explanation:

3). A chemical formula is defined as symbolic representation of a molecule or compound.

The number present as a subscript in a chemical formula depicts the number of atoms of each element present in the compound and the ratio in which they are combining.

For example, chemical formula of phosphorous tetraoxide is $PO_{4}$ .

Therefore, the chemical formula of a compound does NOT indicate how elements are joined in the compound.

4). A chemical reactant is defined as a specie present on the left side of a chemical reaction equation. Whereas a product is a specie that is written on the right side of a chemical reaction equation.

For example, $C_{12}H_{22}O_{11}(s) + 12O_{2}(g) \rightarrow 12CO_{2}(g) + 11H_{2}O(g)$

Therefore, in the chemical reaction in which sucrose is heated and decomposes to form carbon dioxide and water, sucrose is a reactant.

5). A change that does not bring any difference in chemical composition of a substance are known as physical change.

For example, shape, size, mass, volume, density, etc of a substance are all physical changes.

And, a change which brings difference in chemical composition of a substance is known as chemical change.

For example, precipitation, reactivity, toxicity etc are chemical changes.

Therefore, fermenting of cheese is a chemical change and NOT a physical change.

6). Decay of wood is a chemical process because in this process fungus or any other specie tends to digest moist wood. As a result, the wood gets rotten and a change in its chemical composition occur.

Therefore, a chemical change occurs when a piece of wood decays.

7). As chemical composition of a substance changes in a chemical change. This may bring changes like formation of a gas, precipitate formation, endothermic or exothermic process etc.

Whereas fracture information is a physical change because it only brings change in shape of the substance.

Hence, fracture formation does NOT indicate that a chemical change may have taken place.

8). According to law of conservation of matter, matter can neither be created nor it can be destroyed. It can only be changed from one form to another.

Therefore, during a chemical reaction matter is neither destroyed or created.

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Consider the reaction of NO and CO to form N2 and CO2, according to the balanced equation: 2 NO (g) + 2 CO (g) → N2 (g) + 2 CO2

Gekata [30.6K]

The image is not given in the question, it is attached below:

<u>Answer:</u> The excess reactant is NO, the limiting reactant is CO and the products are shown in the image attached below.

<u>Explanation:</u>

In the given image:

Red spheres represent oxygen atoms, blue spheres represent nitrogen atoms and black spheres represent carbon atoms

The combination of 1 black and 2 red spheres will represent carbon dioxide $(CO_2)$ compound

The combination of 2 blue spheres will represent nitrogen molecule $(N_2)$

The combination of 1 blue and 1 red sphere will represent nitrogen monoxide $(NO)$ compound

The combination of 1 black and 1 red sphere will represent nitrogen monoxide $(NO)$ compound

Limiting reagent is defined as the reagent which is completely consumed in the reaction and limits the formation of the product.

Excess reagent is defined as the reagent which is left behind after the completion of the reaction.

We are given:

Given moles of NO = 6 moles

Given moles of CO = 4 moles

For the given chemical equation:

$2NO(g)+2CO(g)\rightarrow N_2(g)+2CO_2(g)$

By stoichiometry of the reaction:

If 2 moles of CO reacts with 2 moles of NO

So, 4 moles of CO will react with = $\frac{2}{2}\times 4=4mol$ of NO

As the given amount of NO is more than the required amount. Thus, it is present in excess and is considered as an excess reagent.

Thus, CO is considered a limiting reagent because it limits the formation of the product.

Hence, the excess reactant is NO, the limiting reactant is CO and the products are shown in the image attached below.

3 0

3 years ago

Which option is an example of a physical property?

4vir4ik [10]

Physical property is C.Density

4 0

3 years ago

Read 2 more answers

In prolonged fasting conditions acetyl-coa generated from the breakdown of amino acids and fatty acids does not enter the citric

Brums [2.3K]

In prolonged fasting conditions acetyl-coa generated from the breakdown of amino acids and fatty acids does not enter the citric acid cycle in the liver, but acetyl-coa derived from ketone bodies can enter the citric acid cycle in the brain. <u>Cholesterol is required in the diet.</u>

<h3>What is amino acids?</h3>

Amino acids are chemical molecules having side chains (R groups) unique to each amino acid as well as amino and carboxylic acid (CO2H) functional groups.

Every amino acid contains the elements carbon (C), hydrogen (H), oxygen (O), and nitrogen (N) (CHON); in addition, the side chains of cysteine and methionine contain sulfur (S), while the less frequent amino acid selenocysteine has selenium (Se). As of 2020, it is known that more than 500 naturally occurring amino acids make up the monomer units of peptides, including proteins.

Despite the fact that there are only 22 proteins, 20 of them have unique specified codons, and another two have unique coding mechanisms: All eukaryotes contain selenocysteine, and pyrrolysine is also present.

To learn more about amino acids from the given link:

brainly.com/question/21327676

#SPJ4

7 0

2 years ago

Consider the first-order reaction shown here. the yellow spheres in the pictures to the right represent the reactant,

Luda [366]

The rate constant of the reaction K we can get it from this formula:

K=㏑2/ t1/2 and when we have this given (missing in question):
that we have one jar is labeled t = 0 S and has 16 yellow spheres inside and the jar beside it labeled t= 10 and has 8 yellow spheres and 8 blue spheres and the yellow spheres represent the reactants A and the blue represent the products B

So when after 10 s and we were having 16 yellow spheres as reactants and becomes 8 yellow and 8 blue spheres as products so it decays to the half amount so we can consider T1/2 = 10 s
a) by substitution in K formula:
∴ K = ㏑2 / 10 = 0.069
The amount of A (the reactants) after N half lives = Ao / 2^n
b) so no.of yellow spheres after 20 s (2 half-lives) = 16/2^2 = 4
and the blue spheres = Ao - no.of yellow spheres left = 16 - 4 = 12
c) The no.of yellow spheres after 30 s (3 half-lives) = 16/2^3 = 2
and the blue spheres = 16 - 2 = 14

8 0

3 years ago

Please answer this time without just getting points D.

xz_007 [3.2K]

D is the answer here look

4 0

2 years ago