CHEMISTRY HIGH SCHOOL

What is the pHpH of a 0.10M0.10M solution of NCNNaCN? The aK a​ of HCNHCN is 4.9×10−104.9×10 −10 . A) 5.15 B) 8.85 C) 2.85 D) 11.15

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Answer 1
Answer:

Hello, you can find the photo I took here, it should help. https://t.ly/MhKKA

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A chemical reaction between iron atoms and oxygen molecules can only occur if(1) the particles are heated(2) the atmospheric pressure decreases(3) there is a catalyst present(4) there are effective collisions between the particles
As a sample of matter is cooled, its particles
Given the balanced equation representing a reaction:Zn(s) +H2SO2(aq) ==> ZnSO4(aq) + H2(g)What type of reaction is represented by this equation? (1) decomposition (3) single replacement (2) double replacement (4) synthesis
Based on the equation below, which of the following statements best describes what should be observed as the reaction takes place?Zn(s) + 2HCl(aq) = ZnCl2(aq) + H2(g) Select one or more: a. Chlorine forming a solid precipitate b. Bubbles forming from hydrogen gas production c. Solid zinc dissolving d. Bubbles forming from chlorine gas production
Energy + 6CO2 + 6H2O → 6O2 + C6H12O6 The purpose of photosynthesis is to produce usable chemical energy or glucose from solar energy. If the formula for glucose is C6H12O6, how many atoms of carbon are used to produce the glucose?A) 1B) 2 C) 6 D) 9

What do hydrogen ions and hydroxide ions come together to form?a. a base
b. water
c.a tritant
d. an acid

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They come together to form water. I hope this helps. Let me know if anything is unclear. That is the bases of a neutralization reaction.

2 ways in which the carbon is stored for a long time

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1) Carbon can be stored as chemical energy in the cells of the plant or the animal. So, the carbon will stay stored as part of the organic material that makes up the plant or animal until it dies. When a plant or animal dies, it either decomposes and the carbon is released back into the environment; or the organic material of the organism is buried and transformed over millions of years into coal, oil, or natural gas. 
2)Another way that carbon is stored for long periods of time is when carbon is used by ocean organisms. Many ocean creatures use calcium carbonate (CaCO3) to make their shells or to make the reef material where coral animals live. When algae die, their organic material becomes part of the ocean sediments, which may stay at the bottom of the ocean for many years. Over millions of years, those same ocean sediments can be forced down into the mantle when oceanic crust is consumed in deep ocean trenches. As the ocean sediments melt and form magma, carbon dioxide is eventually released when volcanoes erupt.

What is not an example of a. Catalyst

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The combustion of coal

Choose the correct answer to complete the paragraph about the acceptance of the heliocentric model. In the second century BCE, the Greek astronomer Ptolemy tried to explain the backward movement of the planets by using a solar system model that included . For centuries, this was the accepted model. During the Renaissance, Nicholas discovered the old heliocentric model of Aristarchus. In Aristarchus’s model, the rising and setting of the Sun was explained by the movement of the .

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In the second century BCE, the Greek astronomer Ptolemy tried to explain the backward movement of the planets by using a solar system model that included epicycles. For centuries, this was the accepted model. During the Renaissance, Nicholas Copernicus discovered the old heliocentric model of Aristarchus. In Aristarchus’s model, the rising and setting of the Sun was explained by the movement of the Earth.

What is Heliocentric Model?

The heliocentric theory of the Solar System (aka, the heliocentric model) is a theory that places the Sun at the center of the Solar System. It also maintains that the Earth revolves around the Sun.

This theory was first proposed by Nicolaus Copernicus.

Copernicus was the first to propose a theory which differed from Ptolemy's Geocentric System, according to which the earth is at rest in the center with the rest of the planets revolving around it. The claim that all planets revolve around the sun had been raised in ancient times, but Copernicus was the first to succeed in describing the movements of the planets using an astronomical theory which placed the sun at the center.

Therefore, In the second century BCE, the Greek astronomer Ptolemy tried to explain the backward movement of the planets by using a solar system model that included epicycles. For centuries, this was the accepted model. During the Renaissance, Nicholas Copernicus discovered the old heliocentric model of Aristarchus. In Aristarchus’s model, the rising and setting of the Sun was explained by the movement of the Earth.

Learn more about Heliocentric Model, here:

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Answer:

the first blank is epicycle.

the second blank is Copernicus

the third blank is earth

Which is true about models in science?A-Models are accurate enough for the phenomena they represent.
B-Models only present macroscopic versions of the submicroscopic.
C-Models help explain phenomena but are not good for predicting events.
D-Models are used throughout science although they are not always accurate.

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D-Models are used throughout science although they are not always accurate.
I think c is the answer but I could be wrong..

Hydrocarbons are separated from each other by a process called cracking distillation. a. True
b. False

Answers

True, cracking distillation is one process used to break hydrocarbons into smaller and more useful parts. This is achieved by using high temperatures and pressures with a catalyst. The most common catalyst used are the zeolites.

Answer:

Correct answer is FALSE I just tested it and it came out right.

Explanation:
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