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Valentin [98]
3 years ago
14

Which statement is true if the Hrxn of a reaction is positive?

Chemistry
2 answers:
erma4kov [3.2K]3 years ago
7 0
I think it is b..................................................
iren2701 [21]3 years ago
3 0

<u>Answer:</u> The correct answer is Option A.

<u>Explanation:</u>

Endothermic reactions are defined as the reactions in which potential energy of the reactants is less than the potential energy of the products. The total enthalpy change of the reaction (\Delta H_{rxn}) comes out to be positive. Energy is absorbed during this reaction.

\Delta H_{rxn}=\Delta H_{products}-\Delta H_{reactants}=+ve

Exothermic reactions are defined as the reactions in which potential energy of the products is less than the potential energy of the reactants. The total enthalpy change of the reaction (\Delta H_{rxn}) comes out to be negative. Energy is released during this reaction.

\Delta H_{rxn}=\Delta H_{products}-\Delta H_{reactants}=-ve

From the above information, the correct answer is Option A.

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How did Wilma contribute to change in America
Natasha_Volkova [10]

Answer:

She overcame her disabilities to compete in the 1956 Summer Olympic Games, and in 1960, she became the first American woman to win three gold medals in track and field at a single Olympics. Later in life, she formed the Wilma Rudolph Foundation to promote amateur athletics.

Explanation:

3 0
3 years ago
The main difference between heat and temperature is that temperature is solely dependent on the A. mass of a body. B. velocity o
olga_2 [115]

Answer:velocity of molecules within a body

Explanation:

Temperature is defined as the average kinetic energy of the molecules of a body. The kinetic energy of a body depends on the velocity of the molecules of the body. When the temperature of a body increases, its particles acquire greater kinetic energy and move at higher velocity. Hence temperature depends on the velocity of the molecules of a body while heat is a form of energy.

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3 years ago
Lab Report
Alenkasestr [34]

Answer:

I know some of them...

Explanation:

1. What was the purpose of the experiment?

Type your answer here: The purpose of this experiment is to show that a cell membrane is a type of barrier, and is permeable to some substances, but may not be permeable to all substances.

2. What were the independent, dependent, and control variables in your investigation? Describe the variables used in the part of the experiment with the eggs.

Type your answer here: Independent variable / Manipulated variable: Refers to all the variables in an experiment that provoke a response in another variable. This variable is modified during the experiment to analyze how another variable responds to it. The researcher wants to study how the changes in these variables affect the dependent variable.  The researcher can change these variables to see what changes it implies in an object, process, trait, or anything that depends on them.

Dependent variable / Responding variable: Its response depends on any change in the independent variable. The dependent variable is the one that is being investigated, studied, and measured. It represents a quantity of something which value depends on how the independent variable is modified. It is usually identified by the letter Y.  A change in the dependent variable might be proportional or inversely proportional to the change in the manipulated variable. In the exposed example, the dependent variable is the egg circumference.

Constants / Controlled variables: Refers to those variables in an experiment that are controlled and have no influence on the results. These variables do not affect the change in the dependent variable values. In the exposed example the use of the lid to seal the jar and the amount and concentration of vinegar might be considered as a controlled variable. These elements are used but do not provoke any change in the size of the egg.

thats it... CAN SOMEONE ANSWER THE OTHERS?! I NEED ITT

4 0
3 years ago
5 atoms Pb to mol Pb
jek_recluse [69]

Answer:

0,83 x 10-²³ mol

Explanation:

n=N/Na

n=5:(6,02 x 10²³)

5 0
3 years ago
The President's Challenge Program is a fitness evaluation designed for __________.
lara [203]
Hi there!

I believe the answer to this is B. Elementary and High school students.

Hope this helps! ☺♥
7 0
3 years ago
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