CHEMISTRY HIGH SCHOOL

Changes in color , energy, and odor are indications that a

Answers

Answer 1
Answer: I think a chemical change

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The diagram shows a ball resting at the top of a hill. Which statement best describes the energy in this system

Answers

Answer:

Option A is correct.

A.The potential energy in the system is greatest at X.

Explanation:

A ball resting at the top of a hill will have greatest potential energy because when an object is at rest it tend to have greatest potential energy. When It moves from position X to Y the potential energy of the ball will decrease and its kinetic energy will increase.

Answer choices are listed below.

A.The potential energy in the system is greatest at X.

B.The kinetic energy in the system is greatest at X. 
C.Total energy in the system decreases as the ball moves from X to Y.
D.Total energy in the system increases as the ball moves from X to Y.

What is the percent by mass of potassium in K3Fe(CN)6?16.96%
21.88%
25.53%
35.62%

Answers

The percent mass of potassium in K3Fe(CN)6 is 35.62%. The molar mass (Mr) of K3Fe(CN)6 is the sum of atomic masses (Ar) of its elements. Ar(K) = 39.1 g/mol, Ar(Fe) = 55.84 g/mol; Ar(C) = 12.01 g/mol; Ar(N) = 14.01 g/mol. Mr(K3Fe(CN)6) = 3Ar(K) + Ar(Fe) + 6Ar(C) + 6Ar(N) = 3 * 39.1 + 55.85 + 6 * 12.01 + 6 * 14.01 = 117.3 + 55.85 + 72.06 + 84.06 = 329.27 g/mol. There are 3 atoms of K, so total mass of K in K3Fe(CN)6 is: 3Ar(K) = 3 * 39.1 = 117.3 g/mol. In percents, this is: 329.27 : 100% = 117.3 : x. x = 100% * 117.3 : 329.27 = 35.62%

Answer:

%35.62

Explanation:

Just took the test

What is pH a measure of?a. density
b. solute concentration
c. hydrogen-ion concentration
d. ion concentration in a solution

Answers

it measures the acidity/basic level, that rules A out
hope this helped a little

Answer:

c. hydrogen-ion concentration

Explanation:

pH is a logarithmic measure of the hydrogen ion concentration of an aqueous solution pH = -log[H + ] where log is the base 10 logarithm and [H + ] is the hydrogen ion concentration in moles per liter

The liquid part of a homogeneous mixture is the _____.a. solvent
b. solution
c. solute
d. colloid

Answers

The liquid part of a homogeneous mixture is most often than not the a. solvent

This depends on the type of homogeneous mixture at hand. For a liquid-solid homogeneous mixture, the liquid works as the solvent. For a gas-liquid homogeneous mixture, the liquid often works as the solvent as well. However, for a liquid-liquid homogeneous mixture, the liquid acts as both the solute and solvent. 

The nucleus of an atom can have either a positive or negative charge

Answers

The statement is false. The nucleus of an atom can only have a positive charge. The nucleus is made up of protons and neutrons. Protons are positively charged particles while the neutrons do not have a charge. Therefore, the nucleus is positively charged.

2KI + Pb(NO3)2 → 2KNO3 + PbI2 Determine how many grams of KI are required to produce 1.2g of PbI2.

Answers

Molar mass KI = 166.0028 g/mol   and Pbl₂ = 461.0089 g/mol

2 Kl + Pb(NO₃)₂ ------> 2 KNO₃ + Pbl₂

2 x 166.0028 g ---------> 461.0089 g
           ? g KI -------------> 1.2 g

Mass KI = 1.2 x 2 x 166.0028 / 461.0089

Mass KI = 398.40672 / 461.0089

Mass KI = 0.86 g

hope this helps!
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