Which of the following is the SI unit used to measure mass?

Answers

Answer 1

Answer:

The SI unit used to measure mass is said to be option A: kilogram (kg).

What is the SI unit used to measure mass?

The kilogram (kg) is the standard unit used to measure mass. The kilogram is the main unit used to measure how heavy something is in the International System of Units. It is based on the weight of a special cylinder made of platinum and iridium called the International Prototype of the Kilogram.

The liter (b.) is the SI unit for volume, the meter (c.) is the SI unit for length, and the Kelvin (d.) is the SI unit for temperature. The kilogram is commonly used as a standard unit for measuring weight in science, industry, and everyday situations.

Hence option A is correct.

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A 30.00 mL solution of 0.100M benzoic acid, a monoprotic acid, is titrated with 0.100M NaOH. The Ka is 6.3x10^-5. Determine the pH of the solution after the volumes of NaOH given were added. a. 0ml b. 10.00ml c. 30.00ml d. 40.00ml

Ammonia and sulfuric acid react to form ammonium sulfate. Determine the starting mass of each reactant if 20.3 g of ammonium sulfate is produced and 5.89g of sulfuric acid remains unreacted.

Answers

Answer: The mass of ammonia is 5.236 g and that of sulfuric acid is 15.064 g

Explanation:

Calculating the mass of ammonia:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Given mass of ammonium sulfate = 20.3 g

Molar mass of ammonium sulfate = 132.14 g/mol

Putting values in equation 1, we get:

$\text{Moles of ammonium sulfate}=(20.3g)/(132.14g/mol)=0.154mol$

The chemical equation for the reaction of ammonia and sulfuric acid follows:

$2NH_3+H_2SO_4\rightarrow (NH_4)_2SO_4$

As, sulfuric acid remains unreacted, which means it is an excess reagent and its starting mass cannot be determined from ammonium sulfate.

By Stoichiometry of the reaction:

1 mole of ammonium sulfate is produced by 2 moles of ammonia.

So, 0.154 moles of ammonium sulfate is produced by = $(2)/(1)* 0.154=0.308mol$ of ammonia.

Now, calculating the mass of ammonia from equation 1, we get:

Molar mass of ammonia = 17 g/mol

Moles of ammonia = 0.308 moles

Putting values in equation 1, we get:

$0.308mol=\frac{\text{Mass of ammonia}}{17g/mol}\n\n\text{Mass of ammonia}=5.236g$

Calculating the mass of sulfuric acid

Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.

This also means that total mass on the reactant side must be equal to the total mass on the product side.

Let the mass of sulfuric acid be 'x' grams

We are given:

Mass of ammonium sulfate = 20.3 grams

Mass of ammonia = 5.236 grams

Total mass on reactant side = 5.236 + x

Total mass on product side = 20.3 g

So, by applying law of conservation of mass, we get:

$5.236+x=20.3\n\nx=15.064g$

Hence, the mass of ammonia is 5.236 g and that of sulfuric acid is 15.064 g

2NH₃ + H₂SO₄ ⇒ (NH₄)₂SO₄
34.06g : 98.08g : 132.14g
x y 20.03g

x = [20.03g*34.06g]/132.14g = 5.16g

5.16g + y = 20.03g ⇔ from stoichiometric ratio
20.03g - 5.16g = y
y = 14,87g + 5.89g = 20.76g ⇔ 5.89g of sulfuric(VI) acid remains unreacted

Starting mass:

mNH₃ = 5.16g
mH₂SO₄ = 20.76g

1a. Identify the chemical_____ comes from the breakdown of proteins.

Answers

is it amino acids???????

What's the size of a astatine Atom compared to a tellurium Atom

Answers

In the periodic table, the group number of astatine is 17 while that of tellurium is 16, hence the size of astatine is larger as compared to tellurium as it has one more shell present in it's atom.

What is periodic table?

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.

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the answer is Astatine is one period further than tellurium, meaning it has an extra shell. Therefore, the At atom will be bigger than the Te atom.

A scientist carries out a reaction twice. In Trial A, the scientist combines the reactants in a container. In Trial B, the scientist combines the reactants in the same container, but she also adds a catalyst. If everything else is the same about the two trials, what is most likely true about Trial B?

Answers

Trail B will have a lower activation energy than trail A because in this trial the scientist added a catalyst.

What is a catalyst?

A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process.

A catalyst is a substance that speeds up a chemical reaction or lowers the temperature or pressure needed to start one, without itself being consumed during the reaction.

Catalysts slow down reaction rates which will in turn mean a loweractivation.

Hence, trail B will have a lower activation energy than trail A because in this trial the scientist added a catalyst.

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Answer:

It will have a lower activation energy than Trial A.

Explanation:

Trail B will have a lower activation energy than trail A because in this trial the scientist adds a catalyst. Catalysts slow down reaction rates which will in turn mean a lower activation.

The gram formula mass of NH4Cl is(1) 22.4 g/mole (3) 53.5 g/mole(2) 28.0 g/mole (4) 95.5 g/mole

Answers

Answer: Option (3) is the correct answer.

Explanation:

Gram formula mass or molar mass is the sum of mass of all the individual atoms present in the compound or formula.

For example, gram formula mass of $NH_(4)Cl$ is calculated as follows.

$NH_(4)Cl = Mass of N + 4 * mass of H + mass of Cl$

= $(14.00 + 4 * 1.00 + 35.45)$ g/mol

= (14.00 + 4.00 + 35.45) g/mol

= 53.45 g/mol

= 53.5 g/mol (approx)

Thus, we can conclude that the gram formula mass of $NH_(4)Cl$ is 53.5 g/mol (approx)

The gram formula mass of NH₄Cl is 53.5 g/mol (3rd option)

How to determine the gram formula mass?

The gram formula mass of a compound is simply the molar mass of the compound.

The gram formula mass of NH₄Cl can be obtained as illustrated below:

Molar mass of N = 14 g/mol
Molar mass of H = 1 g/mol
Molar mass of Cl = 35.5 g/mol
Gram formula mass of NH₄Cl = ?

Gram formula mass of NH₄Cl= 14 + (4 × 1) + 35.5

= 14 + 4 + 35.5

= 53.5 g/mol

Thus, we can conclude that the gram formula mass of NH₄Cl is 53.5 g/mol (3rd option)

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How does a balanced chemical equation show that mass is never lost or gained in a chemical reaction

Answers

mass never changes in anything and after the solution you will notice answer has 1 same number

Final answer:

A balanced chemical equation shows that mass is not lost or gained in a chemical reaction by ensuring the number of atoms and overall charge on both the reactants and products side are equal, adhering to the law of conservation of mass.

Explanation:

A balanced chemical equation is one where the number of each type of atom in the reactants side is equivalent to the number of the same type of atoms in the products side. In chemical reactions, matter cannot be created or destroyed, a principle called the law of conservation of mass. This means that all the atoms present in the reactants will be accounted for in the products, ensuring that mass is never lost or gained during the reaction process.

For instance, if we take the simple chemical reaction of hydrogen and oxygen forming water (2H2 + O2 → 2H2O), you'll see that there are four hydrogen atoms and two oxygen atoms both before and after the reaction, thus demonstrating mass conservation. Additionally, in balanced chemical equations, not only should atoms be balanced, but also charges to ensure charge conservation which is necessary when dealing with ionic substances. The mass balance and charge balance are both instrumental in maintaining the law of conservation of mass in chemical reactions.

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