CHEMISTRY HIGH SCHOOL

In the metric system, which of the following is correct?1,000 liters = 1 milliliter
1,000 kilograms = 1 gram
100 centimeters = 1 meter

Answers

Answer 1
Answer: 100 centimeters = 1 meter
Answer 2
Answer:

Answer:

100 centimeters = 1 meter

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If one ball with a momentum of 50 kg·m/s hits a ball at rest and no other forces are acting on either ball, what's the total momentum of both balls after the collision? A. 0 kg·m/s
B. 25 kg·m/s
C. 100 kg·m/s
D. 50 kg·m/s

Answers

Answer:

The answer is (D) 50 kg·m/s   (PF Test)

Who did Churchill and Roosevelt appoint to lead the Normandy invasion?George Patton
Dwight
d. Eisenhower
John Pershing

Answers

first this aint chemistry second it's DWIGHT D. EISENHOWER
i gotchu
Churchill and Roosevelt appointed Dwight d. Eisenhower to lead the Normandy invasion.

Final Answer: Dwight d. Eisenhower

Which of the following elements will likely form a negative ion in its ionic compounds?a. Li, lithium
c. Mg, magnesium
b. Al, aluminum
d. Cl, chlorine

Answers

It's (D), Cl, chlorine, the others can't form ions
c) Mg, magnesium is the answer

Which element has the greatest density at STP?(1) scandium (3) silicon
(2) selenium (4) sodium

Answers

Answer:

            Selenium has the greatest density at STP.

Explanation:

                   According to Ideal gas equation,

                                                P V  =  n R T

where;

             n =  m/M

Therefore,

                                                P V  =  m R T / M

Rearranging,

                                                P M  =  (m/V) R T

Also,

             m/V  =  density  = d

So,

                                                P M  =  d R T

Solving for density,

                                                d  =  P M / R T

According to this equation density is directly proportional to Molar mass of a substance. Hence, the Atomic masses of given compounds are listed below,

                                                Scandium =  44.96 g.mol⁻¹

                                                Selenium  =  78.97 g.mol⁻¹

                                                Silicon  =  28.09 g.mol⁻¹

                                                Sodium  =  22.99 g.mol⁻¹

Therefore, selenium having the greatest Atomic Mass will have the greatest density. The densities of given elements are as follow;

                                                Scandium =  2.98 g.cm⁻³

                                                Selenium  =  4.81 g.cm⁻³

                                                Silicon  =  2.33 g.cm⁻³

                                                Sodium  =  0.96 g.cm⁻³

\boxed{\left( 2 \right){\text{ Selenium}}}  has the greatest density at STP.

Further Explanation:

Ideal gas law is the equation of state for any hypothetical gas. The expression for the ideal gas equation is as follows:

{\text{PV}} = {\text{nRT}}               …… (1)                                                                

Here,

P is the pressure.

V is the volume.

T is the absolute temperature.

n is the number of moles.

R is the universal gas constant.

The formula to calculate the number of moles is as follows:

{\text{n}}=\frac{{\text{m}}}{{\text{M}}}        ...... (2)                                                                              

Here,

n is the number of moles.

m is the mass.

M is the molar mass.

Substitute the value of n from equation (2) in equation (1).

{\text{PV}} = \frac{{{\text{mRT}}}}{{\text{M}}}      …… (3)                                                        

Rearrange equation (3) as follows:

{\text{PM}} = \frac{{{\text{mRT}}}}{{\text{V}}}      …… (4)

                                                       

The formula to calculate density is as follows:

{\rho }} = \frac{{\text{m}}}{{\text{V}}}     ...... (5)                                                                                    

Here,

{\rho }} is the density.

m is the mass.

V is the volume.

Substitute equation (5) in equation (4).

{\text{PM}} = \rho{\text{RT}}      …… (6)                                                                      

Rearrange equation (6) to calculate the density.

{\rho }} = \frac{{{\text{PM}}}}{{{\text{RT}}}}     ...... (7)                                                                      

At STP, T and P remain constant, R is already a constant. So according to equation (7), density of substance is directly proportional to the molar mass of the substance.

The molar mass of scandium is 44.96 g/mol.

The molar mass of selenium is 78.97 g/mol.

The molar mass of silicon is 28.09 g/mol.

The molar mass of sodium is 22.99 g/mol.

The molar mass of selenium is the highest among the given elements so its density will be the greatest.

Learn more:

1. Which statement is true for Boyle’s law: brainly.com/question/1158880

2. Calculation of volume of gas: brainly.com/question/3636135

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Ideal gas equation

Keywords: P, V, n, R, T, ideal gas, pressure, volume, selenium, sodium, scandium, silicon, 22.99 g/mol, 78.97 g/mol, 28.09 g/mol, 44.96 g/mol, density, molar mass.

What is a chemical bond? A. The attraction of two atoms that holds the atoms together
B. A substance that's composed of atoms
C. A representation of chemical properties
D. The force that holds together the elements in a compound

Answers

A., I believe. It's either an ionic, covalent, or hydrogen bond

Chemical bond is the attraction of two atoms that holds the atoms together.

Table salt, NaCl, is an example of an amorphous solid.
TRUE
FALSE

Answers

Answer:

False

Explanation:

Before answering the question, it is important to understand;

An amorphous solid is any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids include glass, plastic, and gel. Emphasis on the word noncrystalline.

Table salt on the other hand is an ionic solid made up of Ions of opposite charges (Sodium ion and Chlorine ion) strongly attract each other; those of like charges repel. As a result ions in an ionic compound are arranged in a particular manner.

The ions in NaCl are ordered hence are referred to as crystalline solids  and not amorphous.
False, it is an example of an Ionic solid
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The reactants in a chemical reaction contain 900 J of chemical energy. The products of the reaction contain 9000 J of chemical energy. Which statement best describes this chemical reaction? The reaction absorbs 9000 J of energy from the surroundings as it proceeds. The reaction releases 9000 J of energy to the surroundings as it proceeds. The reaction absorbs 8100 J of energy from the surroundings as it proceeds. The reaction releases 8100 J of energy to the surroundings as it proceeds. The answer is C