CHEMISTRY HIGH SCHOOL

In a biochemical reaction, an enzyme acts as a catalyst, causing the(1) activation energy of the reaction to decrease
(2) potential energy of the reactants to decrease
(3) kinetic energy of the reactants to increase
(4) heat of reaction to increase

Answers

Answer 1
Answer: (1) activation energy of the reaction to decrease.

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#1: Which of the following is an exothermic reaction? A. dissolving ammonium nitrate in water to cool the water B. condensation C. melting ice D. dissolving sugar in water. #2: Two objects (A and B) of the same temperature are in contact with each other. Which of the following statements is true? A. Heat transfers from object B to object A, because molecules from B collide with those from A. B. Heat transfers from object A to object B, because molecules from A collide with those from B. C. Although the molecules collide, no heat transfers because there is no temperature difference between the objects. D. No heat transfers, because there are no collisions between the molecules of the objects. #3: Which of the following parameters is kept constant in a coffee-cup calorimeter? A. temperature B. volume C. pressure D. kinetic energy #4: What type of substance would be best for use in a heating system? A. a liquid with a high specific heat B. a solid with a high specific heat C. a liquid with a low specific heat D. a gas with a low specific heat. #5: The reaction 2 NO(g) → N2(g) + O2(g) has a ΔH = -180.5 kJ. How much heat will be required to produce 44.8 L of NO by the reverse reaction? A. 644 kJ B. 180.5 kJ C. 301 kJ D. 322.3 kJ

Answers

These are the following answers to the five questions:
(1) (B) condensation. Condensation is exothermic, but it's not a reaction, it's a physical change. 
(2) (C) Although the molecules collide, no heat transfers because there is no temperature difference between the objects. 
(3) (C) pressure
(4) (A) a liquid with a high specific heat
(5) Supposing the NO is measured at STP: 
(44.8 L) / (22.4 L/mol) x (180.5 kJ / 2 mol NO) = (B) 180.5 J 

(1) (B) condensation. Condensation is exothermic, but it's not a reaction, it's a physical change. 

(2) (C) Although the molecules collide, no heat transfers because there is no temperature difference between the objects. 

(3) (C) pressure

(4) (A) a liquid with a high specific heat

(5) Supposing the NO is measured at STP: 

(44.8 L) / (22.4 L/mol) x (180.5 kJ / 2 mol NO) = (B) 180.5 J 

3-4 sentences if you give me 3-4 ill like if you give me 5 ill give 5 star if you give me 6 ill do all and branliest pls help. Why is the study of human movement important?

Answers

Human Movement is important because it most commonly used to insure optimal athletic ability. It can also be used to identify the cause of most common sports injuries and movement-related problems. The name for this type of study is called Kinesiology. This is a very necessary part of students understanding dance, sports, and physical well-being. Studying Kinesiology results in better physical performance, as well as many cardiovascular improvements. Kinesiology is used to answer many still unknown question about human movement.

the combustion of propane may be described by the chemical equation, C3H8(g) + 5O2(g) --> 3CO2(g) + 4H2O(g) 

how many grams of O2(g) are needed to completely burn 40.4 g of C3H8(g)?

Answers

\nu_(C_3H_8)=(40.4)/(\mu_(C_3H_8))=
=(40.4)/(3A_C+8A_H)=(40.4)/(44)=
=(9)/(10)=0.9mol
1mol\ C_3H_8...5\ mol\ O_2 \n 0.9mol\ C_3H_8...x\ mol\ O_2
x=(0.9*5)/(1)=4.5mol\ O_2
m=\mu_(O_2)*x=2*A_O*4.5=9*8=72g\ O_2

An atom has 11 protons, 12 neutrons, and 11 electrons. what is the charge of the atoms nucleus?A) +11
B) -11
C) 0
D) 23

Answers

Answer:

Since sodium has 11 protons, the number of neutrons must be 23 – 11 = 12 neutrons.

Explanation:

Compared to a 0.1 M aqueous solution of NaCl, a 0.8 M aqueous solution of NaCl has a(1) higher boiling point and a higher freezing point
(2) higher boiling point and a lower freezing point
(3) lower boiling point and a higher freezing point
(4) lower boiling point and a lower freezing point

Answers

Answer 2, because when you add salt to something, it cools faster (ex. When you add salt to an ice chest so that it stays cold) and it takes longer to boil (ex. When you boil salt out of ocean water so that its safe to drink) therefore, the more NaCl in the solution, the more it will exibit these properties

Explain why ships traveling from east to west across the Atlantic take days longer than ships traveling the same distance from west to east.

Answers

Because when traveling from east to west you are traveling with the earth's rotation. However when you are traveling from west to east you traveling against the earth's rotation causing you to get to your location faster. 
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