How many grams of calcium bromide are in 50.0 mL of a 0.25 M calcium bromide solution?

Answers

Answer 1

Answer:

The mass of the compound can be calculated by the molarity. The mass of the calcium bromide in the given solution is 2.5 g.

The mass of the given compound can be calculated by the molarity formula,

$\bold {M = \frac {w}{m* v} * 1000}\n\n\bold {w = \frac {M* m* v}{ 1000}}$

Where,

M- molarity of the solution = 0.25 M

w - given mass =?

m -molar mass of Calcium bromide = 200 g/mol

v-volume in mL= 50 mL

Put the values in the formula,

$\bold {w = \frac {0.25* 200* 50}{ 1000}}\n\n\bold {w = 2.5\ g}$

Therefore, the mass of the calcium bromide in the given solution is 2.5 g.

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Answer 2

Answer: $C_(m)=(n)/(V_(r))\n\nm=(m)/(M)\n\nC_(m)=(m)/(MV_(r)) \ \ \ \ \Rightarrow \ \ \ \ m=C_(m)MV_(r)}\n\nC_(m)=0.25(mol)/(L)\nM_{CaBr_(2)}=200(g)/(mol)\nV_(r)=50mL=0.05L\n\nm=0.25(mol)/(L)*200(g)/(mol)*0.05L= \emph{\textbf{2.5g}}$

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Watch the animation and observe the titration process of a standard 0.100 M sodium hydroxide solution with 50.0 mL of a 0.100 M hydrochloric acid solution. Identify which of the following statements regarding acid-base titration are correct. A. The pH of the solution at the equivalence point is 7.
B. At the end point, the pH of the solution is 10 and the color of the solution is pink.
C. Before any base is added to the solution, the pH of the solution is 10.
D. The pH of the solution changes very slowly at the equivalence point.
E. At the beginning of the titration process, the pH of the solution increases rapidly.
F. The chemical reaction involved in an acid-base titration is a neutralization reaction.

Answers

Answer

The chemical reaction involved in an acid-base titration is a neutralization reaction.

Explanation:

Final answer:

In this acid-base titration, only statements A and F are correct. At the equivalence point, the pH is 7, and the chemical reaction is a neutralization reaction. Other statements are false for different reasons.

Explanation:

In an acid-base titration process, the goal is to determine the concentration of an unknown acid or base by neutralizing it with an acid or base of a known concentration. This involved process is a neutralization reaction. Here are a few details:

A: The pH of the solution at the equivalence point is 7. This is correct. When a strong acid like hydrochloric acid is titrated with a strong base like sodium hydroxide, the equivalence point occurs at a pH of 7.
B: At the end point, the pH of the solution is 10 and the color of the solution is pink. This is incorrect. The end point will be when the solution is neutral (pH 7) assuming an appropriate indicator is used. The pink color indicates the presence of the base in excess.
C: Before any base is added to the solution, the pH of the solution is 10. This is incorrect. Before the base is added, the solution is acidic and has a pH less than 7.
D: The pH of the solution changes very slowly at the equivalence point. This is incorrect. The pH changes rapidly around the equivalence point due to the equal amounts of acid and base neutralizing each other.
E: At the beginning of the titration process, the pH of the solution increases rapidly. This is incorrect. At the beginning, the pH changes slowly until near the equivalence point where it changes rapidly.
F: The chemical reaction involved in an acid-base titration is a neutralization reaction. This is correct. The reaction between an acid and a base in a titration process is indeed a neutralization reaction which results in a salt and water.

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In the ground state, each atom of an element has two valence electrons. This element has a lower first ionization energy than calcium.Where is this element located on the Periodic Table?
(1) Group 1, Period 4 (3) Group 2, Period 3
(2) Group 2, Period 5 (4) Group 3, Period 4

Answers

Answer: Option (2) is the correct answer.

Explanation:

Ionization energy is defined as the energy required to remove the most loosely bound electron from a neutral gaseous atom.

And, when we move across a period then there is a decrease in the ionization energy due to decrease in the size of atoms.

Whereas when we move down a group then there is an increase in ionization energy because of increase in size of the atoms.

Since, it is given that each atom has 2 valence electrons therefore, all the atoms belong to group 2.

And, as it has lower first ionization energy than calcium it means the atom is larger in size than calcium atom.

Hence, we can conclude that this element located in Group 2, Period 5 on the periodic table.

Final answer:

The element with two valence electrons and a first ionization energy lower than calcium would be found in Group 2, Period 5 on the Periodic Table.

Explanation:

The element you're referring to, with two valence electrons and a lower first ionization energy than calcium, would be located in Group 2, Period 5 on the Periodic Table.

Here's why: Group 2 elements, or alkaline earth metals, all have two valence electrons. Periods on the other hand, describe the energy level of an atom's outermost electrons, with higher periods corresponding to higher energy levels. Thus, an atom in a higher period would have a lower ionization energy (the energy required to remove an electron) than one in a lower period.

Therefore, because the first ionization energy is lower than calcium (which is in Group 2, Period 4) but still has two valence electrons, this element would be located one period below, in Group 2, Period 5.

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Which compound has both ionic and covalent bonds?
(1) CO2 (3) NaI
(2) CH3OH (4) Na2CO3

Answers

The compound that has both ionic and covalent bonds is $\boxed{{\mathbf{4}}{\mathbf{.}}{\text{ }}{\mathbf{N}}{{\mathbf{a}}_{\mathbf{2}}}{\mathbf{C}}{{\mathbf{O}}_{\mathbf{3}}}}$ .

Further explanation:

The periodic properties are characteristics that are associated with the different elements found in the periodic table. The origin of different properties is the difference in the atomic structure of the different elements.

For a systematic study of the chemical and physical properties of different elements, they are placed in certain columns called groups and horizontal rows called periods. The rows of the table called periods and have metals on the left and non-metals on the right. The columns also called groups contains elements with similar chemical properties.

The ionic bond is a chemical bond between two atoms in which one atom donates its electron to another atom. While covalent bonds involve sharing of electrons between two atoms and reach a more stable electron configuration.

Compounds made from two elements can either have an ionic or covalent bond.

(i) If a compound is made between metal and a non-metal then the bond will be ionic.

(ii)If a compound is made between two non-metals then the bond will be covalent.

(1) In ${\mathbf{C}}{{\mathbf{O}}_{\mathbf{2}}}$ , oxygen(O) and carbon(C) are nonmetals. They form a covalent compound, and bond present in ${\mathbf{C}}{{\mathbf{O}}_{\mathbf{2}}}$ will be covalent bond.

(2) In NaI, sodium (Na) is metal and iodine (I) is a nonmetal. They will form an ionic compound, and bond present NaI will be ionic.

(3) In ${\mathbf{C}}{{\mathbf{H}}_{\mathbf{3}}}{\mathbf{OH}}$ , carbon(C) hydrogen(H) and oxygen(O) all are nonmetal atoms they will form a covalent compound, and bond present in will be covalent.

(4) In ${\mathbf{N}}{{\mathbf{a}}_{\mathbf{2}}}{\mathbf{C}}{{\mathbf{O}}_{\mathbf{3}}}$ , sodium(Na) is metal, carbon(C) and oxygen(O) are nonmetals atoms. The bond form between sodium and carbon will be ionic. Also, the bond formed between carbon and oxygen is covalent as both carbon and oxygen are nonmetals. Therefore, ${\text{N}}{{\text{a}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}$ has both covalent and ionic bond.

Hence the correct option is 4.

Learn more:

1. Calculate number of solutes: brainly.com/question/8054051.

2. How many moles of Cl are there in 8 moles of CCl4: brainly.com/question/2094744

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Chemical bonding.

Keywords: Ionic bond, covalent bond, metal, nonmetal, NaI, CO2, Na2CO3, and CH3OH.

Final answer:

Na2CO3 (sodium carbonate) contains both ionic and covalent bonds.

Explanation:

The compound with both ionic and covalent bonds is Na2CO3 (sodium carbonate).

Na2CO3 contains ionic and covalent bonds because it is formed from the reaction between a metal (sodium) and a polyatomic ion (carbonate). The bonds between the sodium and oxygen atoms in the carbonate ion are ionic, while the bonds within the carbonate ion (between carbon and oxygen) are covalent.

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The combustion of a sample butane, C4H10 (lighter fluid) produced 2.46 grams of water. how much oxygen was used up in grams

Answers

The balanced combustion reaction for butane is;

2C4H10 + 13O2 → 8CO2 + 10H2O

Molar mass of water = 18.02 g/mol

Molar mass of oxygen = 32 g/mol

2.46g H2O(1 mol H2O/18.02g)(13 mol O2/10 mol H2O)(32g O2/1 mol O2) = 5.68g O2

As a consequence of the discovery of the nucleus by Rutherford, which model of the atom is thought to be true?Protons, electrons, and neutrons are evenly distributed throughout the volume of the atom.
Electrons are distributed around the nucleus and occupy almost all the volume of the atom.
The nucleus is made of electrons and protons.
The nucleus is made of protons, electrons, and neutrons.

Answers

The answer is (B) Electrons are distributed around the nucleus and occupy almost all the volume of the atom.

As a consequence of the discovery of the nuElectrons are distributed around the nucleus and occupy almost all the volume of the atom.cleus by Rutherford, the model of the atom is thought to be true is

The bonds that link many water molecules together to form a water drop are _____ bonds.ionic
nuclear
hydrogen
covalent

Answers

The bonds found between water molecules are called:

Hydrogen bonds

which contribute to water having a high number of Van Der Waals forces.

Explanation:

A hydrogen bond is an electromagnetic attraction within polar molecules in which hydrogen is joined to a larger atom, such as oxygen or nitrogen. This is not a dividing of electrons, as in a covalent bond. Preferably, this is an attraction among the positive and negative poles of charged atoms.

Answer:

Hydrogen bonds

Explanation:

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