CHEMISTRY HIGH SCHOOL

When you strike a match, you produce frictional heat energy. What does this input of energy represent in a chemical reaction?A.the energy of the reactants
B.the energy of the products
c.the energy of activated complex
d.the energy of activation

Answers

Answer 1
Answer:

The correct answer is D.  The energy needed for a chemical reaction is called the activation energy. This energy is to be present in order for the reaction to happen. This can be achieved by supplying or releasing heat from a system of reactants. This can achieved faster by using a catalyst.

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Mendeleev saw trends in the physical and chemical properties of elements when he organized them by _____.atomic numberphysical propertiesatomic weightdensity
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A gas that produces a "pop" with a burning splint is carbon dioxide. true or false
When fossil fuels are burned, _____ is released into the atmosphere.A. oxygen B. nitrogen C. ammonia D. carbon dioxide

Chlorine melts at 172 k what is chlorines melting point in C

Answers

<HTML><META HTTP-EQUIV="content-type" CONTENT="text/html;charset=utf-8"> <p class="answer-detail Fw-n" id="yui_3_17_2_3_1463589225479_1149"><SPAN class="ya-q-full-text" id="yui_3_17_2_3_1463589225479_1148" itemprop="text">K = 273.15 + C <BR><BR>K = 172 so substitute <BR><BR> 172 = 273.15 + C <BR><BR> C = 172 - 273.15 = -101.15</SPAN> </DIV>

Which of the following gases are typically used for colorful lighting when an electric current is applied?A) hydrogen and helium
B) argon and krypton
C) fluorine and chlorine
D) oxygen and nitrogen

Answers

B) Argon and Krypton
The unreactive nature of noble gases allows them to be applied in such places without the risk of poisonous leaks or other disasters.
B)Argon and Krypton is applied for that..........

Which of the following events on the sun affects the Earth in either a direct or indirect way?A. Corona mass ejection or CMEs only
B. Solar flares only
C. Solar systems only
D. All of the above

Answers

Answer:

Explanation:

D

One mole of ice at 0°C is added to two moles of water at 50°C under a constant external pressure of 1 atm. This process is carried out in a thermally insulated vessel, such that no heat can escape the vessel. When equilibrium is reached, all of the ice has melted. Given: Δ H f u s i o n ∘ ( H 2 O a t 0 ∘ C ) = 6.01 k J m o l C p ( H 2 O , l i q u i d ) = 75 J m o l K a) (7 Points) Calculate the final temperature of the mixture (in °C). Show all work to support your answer.

Answers

Answer:

T2 = 29.79°C

Explanation:

Equliibrium signifies that heat loss = heat gained

Heat gained by Ice;

H = ML

Mass, M = Number of moles * Molar mass = 1 * 18 = 18g

l = 6.01 k J m o l = 334 J/g

C = 4.186 J/g

H =  18(334)

H = 6012

Heat lost by water

H = MCΔT

H = 18 * 4.186 * (50 - T2)

H = 3767.4 - 75.348T2

Since H = H, we have;

6012 = 3767.4 - 75.348T2

- 75.348T2 = 3767 - 6012

T2 = 2245 / 75.348

T2 = 29.79°C

What is the approximate mass of one mole of oxygen gas (O2)?a. 8 g
b. 16 g
c. 32 g
d. 1.204 × 1024

Answers

The correct answer is B.

1 mol O2  x  15.999 O2/ 1 mol O2 = 15.999 O2

16 O2 when rounded.

Acid rain can be destructive to both the natural environment and human-made structures. The equation below shows a reaction that occurs that may lead to the formation of acid rain.3NO2 + H2O  2HNO3 + NO

How many moles (precise to the nearest 0.01 mol) of nitric acid are produced from 300.00 mol of nitrogen dioxide?

200.00 mol
200.09 mol
450.00 mol
450.02 mol

Answers

Answer : The correct option is, 200.00 mole

Explanation : Given,

Moles of nitrogen dioxide = 300.00 mole

The balanced chemical reaction will be,

3NO_2+H_2O\rightarrow 2HNO_3+NO

From the balanced chemical reaction, we conclude that 3 moles of nitrogen dioxide react with 1 mole of water to give 2 moles of nitric acid and 1 mole of nitric oxide as a product.

As, 3 moles of nitrogen dioxide react to give 2 moles of nitric acid

So, 300.00 moles of nitrogen dioxide react to give (2)/(3)* 300.00=200.00 moles of nitric acid

Therefore, the number of moles of nitric acid is, 200.00 moles
Balanced chemical equation

3 NO2 + H2O = 2 HNO3 + NO

3 mol NO2 --------> 2 mol HNO3
300.00 NO2 --------> x mol HNO3

3 * x = 300.00 * 2

3 x = 600.00

x = 600.00 / 3

x = 200.00 mol

hope this helps!.
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