Most modern forms of transportation are powered by fossil fuels. Carbon dioxide, methane, carbon monoxide, and other gases are released into the atmosphere during the production and combustion of these fuels. How might these gases cause climatic changes? These gases have no effect on atmospheric temperatures, so they are unable to cause any type of climatic changes. These gases cause more water vapor to condense, making climates wetter than they were in the past. These gases reduce the amount of thermal energy escaping into space, effectively warming the atmosphere.

QUESTION POSTED AT 14/01/2020 - 03:06 PM

Related questions

Iodine-131 has a half-life of 8.10 days. In how many days will 50 grams of Iodine-131 decay to one-eighth of its original amount?

It doesn't matter what the original mass is. 1/8 is (1/2)-cubed, and 3 half-lives is 8.3 days.

ANSWERED AT 21/01/2020 - 09:47 AM


QUESTION POSTED AT 21/01/2020 - 09:47 AM

When 1.82 mole of HCL reacts with excess MnO2, how many moles of Cl2 form?

The balanced reaction is:

MnO2(s) + 4HCl(aq) → Cl2(g) + MnCl2(aq) + 2H2O(l)

We are given the amount of hydrochloric acid to be used for the reaction. This will be the starting point for the calculations.

1.82 mol HCl ( 1 mol Cl2 / 4 mol HCl) = 0.46 mol Cl2

Therefore, 0.46 mol of chlorine gas is produced for the reaction of hydrochloric acid and manganese oxide.

ANSWERED AT 21/01/2020 - 09:47 AM


QUESTION POSTED AT 21/01/2020 - 09:47 AM

When 1.82 moles of HCL reacts with excess MnO2, how many moles of Cl2 form

Answer: 0.455 moles of chlorine gas is formed.

Explanation:

We are given:

Moles of HCl = 1.82 moles

The chemical equation for the reaction of MnO_2 and HCl follows:

MnO_2(s)+4HCl(aq.)\rightarrow Cl_2(g)+MnCl_2(aq.)+2H_2O(l)

By Stoichiometry of the reaction:

If 4 moles of HCl produces 1 mole of chlorine gas

So, 1.82 moles of HCl will produce = \frac{1}{4}\times 1.82=0.455mol of chlorine gas

Hence, 0.455 moles of chlorine gas is formed.

ANSWERED AT 21/01/2020 - 09:46 AM


QUESTION POSTED AT 21/01/2020 - 09:46 AM

What is the relationship between a mole and Avogadro’s number? A mole is the mass of Avogadro’s number of particles of a substance. A mole is the amount of a compound that has Avogadro’s number of carbon-12 atoms in it. A mole contains Avogadro’s number of particles of a substance. A mole is the amount of any substance that has the same mass as Avogadro’s number of carbon-12 atoms.

Answer: A mole contains Avogadro’s number of particles of a substance.

Explanation:

Avogadro number is defined as the number of particles (atoms or molecules) of present in per mole of that substance. It is denoted by symbol N_A.

According to mole concept, one mole of an atom contains Avogadro's number of particles of that substance.

1mole=N_A=6.022\times 10^{23} mol^{-1}

ANSWERED AT 21/01/2020 - 09:44 AM


QUESTION POSTED AT 21/01/2020 - 09:44 AM

Most atoms in the universe are of the element _________. helium oxygen hydrogen carbon

Hydrogen
If there wasn't any hydrogen at all, we would all be dry like a log in the Sahara Desert. Almost everywhere you can find hydrogen, whether it be little particles in the air, to small particles in the ground.

ANSWERED AT 21/01/2020 - 09:44 AM


QUESTION POSTED AT 21/01/2020 - 09:44 AM

What is the volume of 3.5 moles of oxygen gas (O2) at standard temperature and pressure (STP)?

1 mole ----------- 22.4 L ( at STP )
3.5 mols --------- ?

V  = 3.5 x 22.4 / 1

V = 78.4 L

hope this helps!


ANSWERED AT 21/01/2020 - 09:39 AM


QUESTION POSTED AT 21/01/2020 - 09:39 AM

Which best describes ionization energy? energy needed to add an electron to a neutral atom in the gas phase energy needed to add an electron to a neutral atom in the liquid phase energy needed to remove an electron from an atom or ion in the gas phase energy needed to remove an electron from an atom or ion in the liquid phase

Ionization energy is the energy needed to remove an electron from an atom or ion in a gas phase. The atom will become a cation and has an excess of proton, thus it will be positively charged. Ionization energy usually removes the most loosely bound valence electron.

ANSWERED AT 21/01/2020 - 09:38 AM


QUESTION POSTED AT 21/01/2020 - 09:38 AM

Rocks formed by changes in heat and pressure or the presence of hot, watery fluids

Rocks formed by changes in heat and pressure or the presence of hot, watery fluids are called igneous rocks.

Further Explanations:

Igneous rocks also termed as magmatic rocks is among one the three types of rocks formed by the freezing and solidification of lava derived from the partial melts of the planets mantle or crust. The process of formation of the igneous rocks would have occurred either by an increase in temperature or by decreases in pressure or by the change in composition of the soil. These processes occur either on the surface of extrusive rocks or below the intrusive rocks and can form layer covering upto16 km of Earth’s crust volume.

The igneous rocks form granular, crystalline rocks by crystallization or forms natural glasses lacking crystallization.These rocks occur at different geological landforms namely platforms, basins, extended crust, oceanic crust, shields, and igneous provinces.  

Learn More

1. What layers of earth make up the lithosphere answers Details?brainly.com/question/1593688

2. What resource can best help you learn about the terrain in a particular area before you arrive?

brainly.com/question/2533802

3. Which of the following is not true about sedimentary rocks? a. they are formed through compaction and cementation. c. they occur from igneous rock fragments. b. they are made up of sediments. d. they are not part of the rock cycle?

brainly.com/question/2740663

Answer Details:

Grade: High School

Subject: Geography

Chapter: Igneous rocks

Keywords: Igneous rocks, magmatic rocks, freezing and solidification, freezing and solidification, extrusive rocks, crystalline rocks, basins, extended crust, oceanic crust, shields, and igneous provinces basins, extended crust, oceanic crust, shields, igneous provinces

ANSWERED AT 21/01/2020 - 09:36 AM


QUESTION POSTED AT 21/01/2020 - 09:36 AM

Full form of pH exact

Potential of Hydrogen.

ANSWERED AT 21/01/2020 - 09:28 AM


QUESTION POSTED AT 21/01/2020 - 09:28 AM

Using the activity series provided. Which reactants will form products? Na>Mg>Al>Mn>Zn>Cr>Fe>Cd>Co>Ni>Sn>Pb>H>Sb>Bi>Cu>Ag 1. Ag +NaNO3 2. Fe + Al2O3 3. Ni + NaCl 4. Fe + Cu(NO3)2

The series of metals shown above is what we call the activity series. This is a guide for us to know what products are formed during a metal displacement reaction. A metal must be above the other metallic compound for displacement to occur. 

1. Ag is way below the series compared to Na. No reaction occurs.
2. Al  is above Fe, no reaction occurs. 
3. Na is above Ni, no reaction will occur. 
4. Fe is a more active metal than copper. A displacement reaction will occur. 


ANSWERED AT 21/01/2020 - 09:12 AM


QUESTION POSTED AT 21/01/2020 - 09:12 AM

PLEASE CHECK MY SEMESTER EXAM ANSWERS!!! I HAVE A FLIGHT TO CATCH!! MUST SUBMIT SOON!!! Question 1 (Multiple Choice Worth 2 points) [07.06]What is the major difference between nuclear and chemical reactions? Only chemical reactions release energy. Only chemical reactions release gamma rays. Only nuclear reactions involve the exchange of electrons. I picked: Only nuclear reactions change the identity of an element. ------------------------------------------------------------------ Question 2 (Multiple Choice Worth 2 points) [07.03]When water is added to an Erlenmeyer flask and then sealed, phase equilibrium occurs. Which answer explains the resulting dynamic equilibrium? Rate of evaporation = rate of precipitation I picked: Rate of condensation = rate of evaporation Moles of vapor = moles of liquid Moles of vapor = moles of solid ------------------------------------------------------------------ Question 3 (Multiple Choice Worth 2 points) [05.01]Which phase of matter is made up of particles that are packed closely together, with both a definite shape and a definite volume? Gas Liquid Plasma I picked: Solid --------------------------------------------------------------- Question 4 (Multiple Choice Worth 2 points) [06.02]When sulfuric acid is poured on sugar the volume of sugar expands and the sugar turns black and becomes very hot. Which of the following best describes this reaction? Endothermic I picked: Exothermic Decomposition Synthesis ----------------------------------------------------------------- Question 5 (Multiple Choice Worth 2 points) [07.01]Which of the following is not true of acids? Acids are corrosive. I picked: Acids feel slippery. Acids have a sour taste. Acids have more hydronium ions than hydroxide ions. ---------------------------------------------------------------------- Question 6 (Multiple Choice Worth 2 points) [06.04]According to the collision theory, what is the best explanation for why a higher temperature makes a reaction go faster? There are fewer collisions per minute. It increases the distance between the particles. It decreases the average kinetic energy of the particles. I picked: It increases the average kinetic energy and number of collisions per minute. ---------------------------------------------------------------- Question 7 (Multiple Choice Worth 2 points) [07.02]Which of the following represents pure water? [H3O+] > [OH-] [H3O+] < [OH-] I picked: [H3O+] = [OH-] [H3O+] [OH-] = 14 ---------------------------------------------------------------------------- Question 8 (Multiple Choice Worth 2 points) [07.06]Which of the following types of radiation can penetrate the most deeply into your body? Alpha rays Beta rays I picked: Gamma rays Proton rays ---------------------------------------------------------------- Question 9 (Multiple Choice Worth 2 points) [07.05]In the chemical reaction shown below, which element was oxidized? 2K + Cl2 yields 2KCl I picked: K, because it lost one electron K, because it gained one electron Cl, because it lost one electron Cl, because it gained one electron ---------------------------------------------------------------------- Question 10 (Multiple Choice Worth 2 points) [06.02]On an exothermic potential energy diagram, what is true for the products? The products are at the same energy level as the reactants. I picked: The products are at a lower energy level than the reactants. The products are at a higher energy level than the reactants. The products do not have energy. ----------------------------------------------------------------- Question 11 (Multiple Choice Worth 2 points) [07.02]What is the salt formed in the following neutralization reaction? Mg(OH)2 + HCl yields H2O + MgCl2 Mg(OH)2 HCl H2O I picked: MgCl2

Answer:

Q1 - Only nuclear reactions change the identity of an element, since they work with the element nucleus which is the atom's part that involves the number of protons in it. The protons define what element we are using in the reaction.

Q2- Rate of condensation = rate of evaporation, since water is in liquid form and the two possible transformations that can happen without changing the flask's temperature are condensation and evaporation. There is no solid form involved to cause precipitation and we don't calculate the moles based on the state the molecules are presented like liquid and vapor.

Q3- Solid phase of matter has a definite shape and volume, since the molecules are arranged in a specific way, close to each other and without much movement possibilities.

Q4- Exothermic, since the reaction involves heat liberation, which characterizes exothermic reactions.

Q5 - Acid feel slippery is not a true consideration when talking about acids' properties. This property would be true to bases, which explains the soapy feeling when it degrades fats into soap.

Q6- It increases the average of kinetic energy and number of collisions per minute, because it gives kinetic energy to the molecules involved in the process, making them move faster and collide more to each other.

Q7- [H3O+]=[OH-] , since those are the ions in water molecules. When combined, they form H2O, the pure water form.

Q8- Gamma rays can penetrate your body the deepest, since they are very energized and short-wavenlenghted. These properties make it easier for them to penetrate into your body.

Q9 - K, because it lost one electron due to the ionic bond that is being formed in the product KCl.

Q10- The products are at a lower energy level than the reactants, since energy is lost during the reaction through heat liberation (exothermic reactions liberate heat to the surroundings).

Q11 - MgCl2, since a salt is composed by two inorganic elements.

ANSWERED AT 21/01/2020 - 09:10 AM


QUESTION POSTED AT 21/01/2020 - 09:10 AM

Water will act as a Bronsted lowry acid with which of the following molecules? A.NH3 B.H2S C.HCN D.CH3COOH

A.NH3 because a water molecule donates a proton, making ammonia as a product: H2O(ℓ) + NH2−(aq) --> OH−(aq) + NH3(aq)

ANSWERED AT 21/01/2020 - 09:09 AM


QUESTION POSTED AT 21/01/2020 - 09:09 AM

A hygrometer measures A. temperature. B. air pressure. C. humidity. D. wind speed

C is the answer to this question.

ANSWERED AT 21/01/2020 - 09:03 AM


QUESTION POSTED AT 21/01/2020 - 09:03 AM

How many moles of carbon dioxide gas can be produced when 5.45 moles of benzene (C6H6) react with excess oxygen? Be sure to show the work that you did to solve this problem. Unbalanced equation: C6H6 + O2 “yields”/ CO2 + H2O

Assuming it is complete combustion, the products would be CO2 and H2O.

We must have a balanced equation,

C6H6 + (15/2)O2 -> 6CO2 + 3H2O

This means 1 mol C6H6 yields 6 mol CO2

5.45 mol C6H6 ( 6 mol CO2 / 1 mol C6H6) = 32.7 mol CO2

ANSWERED AT 21/01/2020 - 09:03 AM


QUESTION POSTED AT 21/01/2020 - 09:03 AM

Now consider an excited state hydrogen atom. What is the energy of the electron in the N= 2 level

I get a result of -5.4925 x10^-19 hope this helped 

ANSWERED AT 21/01/2020 - 09:00 AM


QUESTION POSTED AT 21/01/2020 - 09:00 AM

Write a balanced chemical equation that expresses the reaction that will occur during this experiment and that will convert hydrogen peroxide (H2O2) to oxygen (O2) gas and liquid water (H2O).

The balanced reaction is: H2O2 -> H2O + (1/2) O2

However, this is a very awkward equation since it has a coefficient in fraction form.

Another way to write this equation is:

2 H2O2 -> 2 H2O + O2

Hope this helps.

ANSWERED AT 21/01/2020 - 08:44 AM


QUESTION POSTED AT 21/01/2020 - 08:44 AM

If 17.8 grams of KOH dissolve in enough water to make a 198-gram solution, what is the concentration in percent by mass?

Solute of solution = 17.8 g

Solvn = 198 g

% = 17.8 / 198

w% = 0.089 x 100 = 8.9%  by mass

hope this helps!

ANSWERED AT 21/01/2020 - 08:30 AM


QUESTION POSTED AT 21/01/2020 - 08:30 AM

Noble gases have a full outer energy level and are inactive. These atoms are considered _____. neutral inert an anion a cation

I believe that the answer  .is ( b ) inert 

ANSWERED AT 21/01/2020 - 08:26 AM


QUESTION POSTED AT 21/01/2020 - 08:26 AM

Geckos and water striders rely on forces between molecules. Which statement best identifies the forces involved? a. Geckos use covalent bonds to stick to glass. b .The type of force that water striders use is stronger than the type of force that geckos use. c. Water striders use London dispersion forces to walk on water. d. The type of force that geckos use is attractive, and the type of force that water striders use is repulsive.

Answer:

b .The type of force that water striders use is stronger than the type of force that geckos use.

Explanation:

Geckos and water striders use attractive forces for stick to glass and to walk on water, respectively. The glass is a nonpolar substance, and it's possible that in geckos paws there are nonpolar substances, so the force between them is London's forces.

The water is a polar compound, and the water strides make dipole-dipole forces to walk on water, because in its pawns that are polar molecules too.

Dipole-dipole force is stronger than London's forces because the polar substances are more attracted between them (electrostatic attraction).

ANSWERED AT 21/01/2020 - 08:11 AM


QUESTION POSTED AT 21/01/2020 - 08:11 AM

Which of the following is not an example of a scientific model? a. a diagram of a cell b. a data table c. a three-dimensional representation of an atom d. a graph showing the change in temperature and volume over time for hydrogen gas

Answer: Option (b) is the correct answer.

Explanation:

A scientific model is representation of an object, idea or aim that describes its important characteristics or features in order to visualize its proper functioning and method.

Basically, a scientific model provides actual picture of an object.

For example, a diagram of a cell will describe the parts of the cell or some other important characteristics. So, it is a scientific model.

Whereas a three-dimensional representation of an atom is also a scientific model as it makes easy to visualize or understand how an atom looks like.

A graph showing the change in temperature and volume over time for hydrogen gas is helping to visualize how the temperature and volume of hydrogen gas are changing with time. So, it is a scientific model.

Whereas a data table does not tell or make us visualize anything in a proper manner. That is why, it is not a scientific model.


ANSWERED AT 21/01/2020 - 08:11 AM


QUESTION POSTED AT 21/01/2020 - 08:11 AM

Tijuan mixed a solid and a liquid together in a beaker. He determined that a chemical change occurred. If his conclusion is correct, which substances could he have been observing and why? ice mixed into warm oil, because the change of state that occurred when the ice melted cannot be reversed baking soda mixed into vinegar, because the production of bubbles indicates that a new substance formed sugar mixed into hot water, because the disappearance of solid indicates that the chemical identity of the sugar changed sand mixed into water, because when sand was added the mass of the beaker increased

Answer: second option, baking soda mixed into vinegar, because the production of bubbles indicates that a new substance formed.

Explanation:

1) Indeed the evolution of bubbles when two different substances are mixed together is a good indication that a new substance has been formed. That is because the bubbles are a gas product of the chemical reaction between the reactants.

2) Since, baking soda (NaHCO₃) and vinegar (acetic acid, CH₃COOH) are aqueous solutions, you do not have bubles evolving when they are not mixed. Once, they are mixed, the acetate ion (CH₃COO⁻) will combine with the sodium ion (Na⁺) forming sodium acetate (CH₃COONa) and CO₂ which is the gas (bubbles).

3) Regarding the other options:

i) ice mixed into warm oil: the melting of the ice is just a change of phase, and that is all what you can tell about this interaction. Certainly not a chemical change. In fact, that change can be easily reversed by cooling the mixture.

ii) sugar mixed into hot water: the disappearance of the solid sugar does not indicate that the chemical identity of the sugar changed; it just dissolved; a solution was formed. If you heat the solution, the water will evaporate and you will be able to see the sugar crystals.

4) sand mixed into water: this is a classical example of a heterogeneous mixture, where both substances remain clearly being the same. The addition of mass is not an indicator of a reaction. Mass conservation is a principle that is valid for both physical and chemical changes.

ANSWERED AT 21/01/2020 - 08:00 AM


QUESTION POSTED AT 21/01/2020 - 08:00 AM