CHEMISTRY HIGH SCHOOL

Define boiling point. what was the observed boiling point of water for the liquids and solids experiment

Answers

Answer 1
Answer: Boiling point is the temperature at which the substance boils. Boiling point for water is 212F

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Gaseous methane (CH₄) reacts with gaseous oxygen gas (O₂) to produce gaseous carbon dioxide (CO₂) and gaseous water (H₂O) If 0.391 g of carbon dioxide is produced from the reaction of 0.16 g of methane and 0.84 g of oxygen gas, calculate the percent yield of carbon dioxide.
Although incineration can break down harmful chemicals, the byproduct is hazardous.a. True b. False

Balance the following oxidation-reduction reaction and indicate which atoms have undergone oxidation and reduction. ____HNO3 + ____S ---> ____NO + ____H2SO4

Answers

Explanation:

An equation that contains equal number of atoms on both reactant and product side is known as a balanced chemical equation.

Whereas when there will be increase in oxidation number of the atom then it is known as oxidation. When there is decrease in oxidation number of the atom then it is known as reduction.

For example, 4HNO_(3) + S \rightarrow NO + H_(2)SO_(4) + H_(2)O

Oxidation half reaction :S \rightarrow H_(2)SO_(4) + 6e^(-)

Reduction half reaction :HNO_(3) + 3e^(-) \rightarrow NO

Therefore, we can conclude that sulfur atom has undergone oxidation and nitrogen atom has undergone reduction.
The following oxidation-reduction reaction and indicate which atoms have undergone oxidation and reduction.
2HNO3 + S ---> 2NO + H2SO4

A faster pulse rate results in a _____ overall heat input. Answer options are 1. Higher or 2. Lower

Answers

a faster pulse rate results in a higher overall heat input

Answer:

higher

Explana

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.

Learn more about periodic table,here:

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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.

What is the temperature of 1.2 moles of Helium gas at 1950 mm Hg if it occupies 15,500 ml of volume?

Answers

Answer:

T=404.16K=13.1^oC

Explanation:

Hello,

In this case, we use the ideal gas equation to compute the requested temperature as shown below and considering the proper units:

PV=nRT\nT=(PV)/(nR)=(1950mmHg*(1atm)/(760mmHg)*15500mL*(1L)/(1000mL) )/(1.2mol*0.082 (atm*L)/(mol*K) ) \nT=404.16K=13.1^oC

Best regards.

Replace  with  

1950

m

m

H

g

1950mmHg and simplify.

1.2

,

1950

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m

H

g

,

15

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500

m

L

Lewis structure of Ch3Ch2NH3+

Answers

       H    H    H
        I      I     I  
H -- C -- C -- N -- H
        I      I      I
       H    H    H

The Is stand for dashes, sorry I couldn't draw this better.

Final answer:

The Lewis structure for the molecule CH3CH2NH3+ (ethylammonium) showcases hydrogen atoms bonded to carbon and nitrogen atoms. The positive charge resides on the nitrogen atom.

Explanation:

The molecule CH3CH2NH3+ is also known as ethylammonium, a form of a substituted ammonium ion. The Lewis structure of this molecule can be drawn based on the concept that hydrogen has one bond, carbon has four bonds, and nitrogen has three bonds and one lone pair of electrons. The positive charge in CH3CH2NH3+ is located on the nitrogen atom.

Here’s a simple way to draw it:

1. Draw a C atom connected to three H atoms, signifying the CH3 group.

2. Draw another C atom bonded to the first C and two H atoms, signifying the CH2 group.

3. Draw the N atom connected to the second C and three H atoms, signifying the NH3 group.

4. Mark a + sign near the N atom to indicate the positive charge.

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In an experiment, 2.54 grams of copper completely reacts with sulfur, producing 3.18 grams of copper(I) sulfide.Determine the total mass of sulfur consumed.
Write the chemical formula of the compound produced.

Answers

Answer:

               0.64 g of S

Solution:

               The balance chemical equation is as follow,

                                           2 Cu + S ----> Cu₂S

According to equation,

                        127 g (2 mole) Cu produces = 159 g (1 mole) of Cu₂S

So,

                                 2.54 g Cu will produce = X g of Cu₂S

Solving for X,

                     X = (2.54 g * 159 g) / 127 g

                     X = 3.18 g of Cu₂S

Now, it is confirmed that the reaction is 100% ideal. Therefore,

As,

                       127 g (2 mole) Cu required = 32 g (1 mole) of S

So,

                                2.54 g Cu will require = X g of S

Solving for X,

                      X = (2.54 g * 32 g) / 127 g

                      X = 0.64 g of S

Answer : The total mass of sulfur consumed will be, 0.64 grams and the chemical formula of the compound produced is, Cu_2S copper oxide.

Solution :

According to the law of conservation of mass, the total mass of reactant should be equal to the total mass of product.

The balanced chemical reaction will be,

2Cu+S\rightarrow Cu_2S

In this reaction, copper and sulfur are the reactants and copper sulfide is the product.

Let the mass of sulfur be 'x' gram

\text{The total mass of reactants}=\text{Total mass of copper}+\text{Total mass of sulfur}=2.54g+x

\text{The total mass of product}=\text{Total mass of copper sulfide}=3.18g

According to the law of conservation of mass,

\text{The total mass of reactants}=\text{The total mass of product}

2.54g+x=3.18g

x=(3.18-2.54)g

x=0.64g

Therefore, the total mass of sulfur consumed will be, 0.64 grams and the chemical formula of the compound produced is, Cu_2S copper oxide.
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Describe how you would use the information depicted in the potential energy diagram below to determine the enthalphy change of the reaction and if the reaction is endothermic or exothermic?
Acid rain can be destructive to both the natural environment and human-made structures. The equation below shows a reaction that occurs that may lead to the formation of acid rain.3NO2 + H2O  2HNO3 + NOHow many moles (precise to the nearest 0.01 mol) of nitric acid are produced from 300.00 mol of nitrogen dioxide?200.00 mol200.09 mol450.00 mol450.02 mol