How does a balanced chemical equation demonstrate the Law of Conservation of Mass?
A. it shows that no atoms have been gained or lost during the reaction

B .it shows that only physical changes follow the Law of Conservation of Mass

C. it shows that all compounds remain bonded after the reaction

D. it shows that the properties of the elements stay the same after the reaction


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Answer: The higher the temperature the easier a solid will dissolve.

Explanation: This is because the heat 'excites' the solvent making it easier for it to break apart/ split away from each other

Answer:

When metals react with non-metals, electrons are transferred from the metal atoms to the non-metal atoms, forming ions. The resulting compound is called an ionic compound. In all of these reactions, the metal atoms give electrons to the non-metal atoms.

Answer:

Isotope is one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties.

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Answer:

Isotopes are atoms of the same element that have the same atomic number but different in mass number.

Answer:

Out of the options provided Neon is the least dense gas

Explanation:

A food supply company produces Yellow-42 (from previous example) in 200-gram wholesale bottles. The grams of FeCl3 needed to produce one bottle of Yellow 42 is 303.638 grams.  The amount of NaOH needed to produce one bottle of Yellow 42 is 226.32 grams.

∴

Using the relation for the number of moles which is:

[tex]\mathbf{number \ of \ moles = \dfrac{mass }{molar \ mass}}[/tex]

[tex]\mathbf{number \ of \ moles \ of \ Yellow \ 42 = \dfrac{200 g }{106.867 \ g/mol}}[/tex]

[tex]\mathbf{number \ of \ moles \ of \ Yellow \ 42 =1.872 \ moles}[/tex]

Now,

∴

Mass of FeCl₃ required = number of moles of  FeCl₃ × molar mass of FeCl₃

Mass of FeCl₃ required = 1.872 moles × 162.2 g/mol

Mass of FeCl₃ required = 303.638 grams

7.

Recall that:

Now, 1.872 moles of Fe(OH)₃ will require (3 × 1.872 moles of NaOH)

= 5.616 moles of NaOH

Thus, the amount of NaOH in grams, that will be needed to produce one bottle of Yellow 42 is:

= 5.616 moles × 40.3 g/mol (molar mass of NaOH)

= 226.32 grams of NaOH

8.

The company could set up this reaction in a way that ensures no iron (III) chloride is wasted in the reaction by using the concept of the stoichiometry of the reaction involved in the system and he should feed the reactant within the ratio of 1:3 for FeCl₃ and NaOH respectively.

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Answer:

A condensation reaction joins two larger molecules by splitting out a smaller molecule — usually water or ammonia — between them.

In an esterification reaction, an OH  from the acid and an H from the alcohol form a molecule of water.

The larger parts join to form the ester.

Ethanol and butanoic acid react to form ethyl butanoate.

Acid-catalyzed dehydration-condensation reactions of carboxylic acids and alcohols produce chemicals called "esters". The dehydration-condensation reaction occurs between 'ethanol' and 'butanoic acid' giving an ester called as "ethyl butanoate".

Ethanol reacts with butanoic acid in the presence of an acid-catalyst and gives ethyl butanoate as ester and water as products. If an acid reacts with a base, salt and water are the products. But ester is not a salt.

i) The carbon skeletal notation for the given reaction is shown below.

ii) The ester is named "ethyl butanoate".

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Answer:

equivalent

Explanation:

hope it works

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Distance covered in 12 minutes = 18 km, now

Unit rate is equal to :

The train travels 1.5 km in 1 minute time interval.

Answer:

[tex]\huge\boxed{\sf 1\ minute = 1.5\ kilometers}[/tex]

Explanation:

12 minutes = 18 kilometers

Divide both sides by 12

12/12 minutes = 18/12 kilometers

1 minute = 3/2 kilometers

1 minute = 1.5 kilometers

[tex]\rule[225]{225}{2}[/tex]

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We can use the formula M₁V₁ = M₂V₂ to determine the moles remaining after the volume is decreased due to evaporation..  

Since M₁V₁ = M₂V₂    (starting mole × starting volume = end mole × end volume)

⇒  (0.125 mol)(265 mL) =  M₂ (186 mL)

         33.125 mol/mL =  186 mL × M₂

⇒                      M₂ = 33.125 mol/mL ÷ 186 mL

                              = 0.178 mol

Answer:

Observe the other planet throughout the year. Look at the environment when the season changes to see what changes in the environment.

Answer:

Every planet in the solar system has seasons. Extraterrestrial seasons are hardly noticeable on some planets (Venus), mindbogglingly extreme on others (Uranus) and in some cases simply impossible to define (Mercury).

2.5 X 10²⁴ atoms of copper is equivalent to 266.7g of Cu.

HOW TO CALCULATE MASS:

Therefore, 2.5 X 10²⁴ atoms of copper is equivalent to 266.7g of Cu.

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Answer:

A. gold has the highest monetary value?

Among the given elements, gold has the highest monetary value. So the correct option is A.

Gold (Au) is a chemical element that belongs to Period 6's Group 11 (Ib) and is a thick, glossy golden valuable metal. Gold has historically been extremely valued due to a number of characteristics. It is typically found in nature in a relatively pure form, is appealing in colour and brightness, resilient to the point of virtual indestructibility, and very flexible.

Due to its perceived worth from the beginning, gold has a history that is unmatched by that of any other metal. Gold is one of the densest metals.

It is a good heat and electrical conductor. It is also the softest, most malleable, and ductile of all the elements; a troy ounce (31.1 grammes) of gold may be hammered into gold leaf, which can be crushed into sheets as thin as 187 square feet (approximately 17 square metres).

Therefore the correct option is A.

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Answer:

Electrovalent / Ionic bond

Explanation:

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Answer:

a proton turns into an atom that goes kabloey into fission products and other neutrons.

Explanation:

Answer:

hạt tạo thành khí oxi có 2 nguyên tử O liên kết vơi nhau ; kí hiệu là O₂

Explanation:

Answer:

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Answer:

Solubility, Volatility, Viscosity and Surface Tension.

Answer:

8txirzrz8rzrirzriz£=,£=,,-8/-9/-¥/

Explanation:

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Answer:

Groups are numbered 1–18 from left to right. The elements in group 1 are known as the alkali metals; those in group 2 are the alkaline earth metals; those in 15 are the pnictogens; those in 16 are the chalcogens; those in 17 are the halogens; and those in 18 are the noble gases.

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The expression is wrong because the neutron should be expressed as 10n, not 01n.

A neutron is a particle that has a mass of 1 but no charge. It is a neutral particle. Seeing that the neutron is uncharged, it has a charge of zero hence zero must be written under.

The mass of the neutron is 1 so 1 must be written on top. The correct way of writing the equation for the decay of U-235 is; 10n + 235 92U.

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Answer:

A neutron should be expressed as 10n, not 01n.

Explanation: I just did it

To study the population of a species we have to collect many data regarding the factors affecting the growth of the species and those which adversely affects their survival.

A key element of conservation practice and policy is species population monitoring, which is defined here as the regular, systematic gathering of data to detect long-term changes in the populations of wild species.

To examine regional, chronological, taxonomic, and methodological patterns in global species monitoring, we built a database of over 1200 programs .

Through standardized web searches, an online stakeholder survey, thorough national searches in a selection of nations, and a review of international biodiversity databases, we discovered monitoring systems.

Most taxonomic groups continue to have scant and poorly coordinated monitoring, and the majority of the data produced are elusive and unlikely to contribute to larger processes for biodiversity conservation.

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Answer:

How is Avogadro constant related to mole?

One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant.

Explanation:

Answer:

Where SiO2 has strong covalent bonds between molecules, SO3 only has weak van der waals intermolecular forces holding its molecules together. Since covalent bonds require more energy to overcome than van der waals, SiO2 requires a higher temperature than SO3 to melt, thus SiO2 has a higher melting point.

Answer:

Tác giả văn bản ' Mẹ tôi ' : Edmondo De Amicis ( 1846-1908 ) là nhà văn người Ý ( I-ta-li-a )

Answer:

For atoms of elements in the same group (except the last 2 columns of group VIIIB), what is the relationship between the group number and the valence electron?

Answer: sodium (Na +) cation and fluoride (F -) anion

Explanation:

Formula and structure: The chemical formula of sodium fluoride is NaF and its molar mass is 41.99 g/mol. It is a simple ionic compound, made of the sodium (Na +) cation and fluoride (F -) anion. The solid salt exists as cubic crystals similar to the crystal structure of sodium chloride (NaCl).

Answer:

4

I think so

have a great day

Answer:

I think it is option one (3)