In an experiment, Ann mixes concentrated sulfuric acid with water in a reaction test tube. The walls of the test tube turn hot.Which of the following type of reaction has occurred?A) endothermic
B) exothermic
C) reversible
D) irreversible

Answers

Answer 1

Answer: B) Exothermic
The reaction released heat energy to its surrounding, thus, it was exothermic.
"exo" is to expel or put outside
"thermic" means heat

Answer 2

Answer:

Answer: B) exothermic

Explanation:

Endothermic: The chemical reactions in which reactants form products by absorption of energy are called as endothermic reactions.

Exothermic : The chemical reactions in which reactants form products along with release of energy are called as exothermic reactions. Thus if walls turn hot that means the energy has been released.

Reversible: The chemical reactions in which reactants form products and products can also be converted back to reactants are called as reversible reactions.

Irreversible: The chemical reactions in which reactants form products but products can not be converted back to reactants are called as irreversible reactions.

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Which of the following is a biogeochemical cycle?a. Atmospheric cycle
b. Iconic cycle
c. Neonic cycle
d. Water cycle

Answers

Biogeochemical cycles are cycles that involve biological, geological and chemical processes. It is a pathway by which a chemical substance moves through the biotic and abiotic compartments of the Earth. Among the options, the one which is a biogeochemical cycle is letter "D. Water cycle"

List four properties of a candle

Answers

1. Physical properties
. Its soft
. Its moldable
. Its white/translucent without color added
. Its insoluble in water
. its soluble in benzene and ether
. it melts around 120 degrees farenheit

2. Chemical properties
. It is a hydrocarbon with around 25 carbon atoms
. it reacts with oxygen to form water vapor and CO2
. its nonpolar (not sure if thats physical or chemical)

Which of the following solids has the highest melting point?(1) H2O(s) (3) SO2(s)(2) Na2O(s) (4) CO2(s)

Answers

The answer is (2) Na2O. Considering these compounds status under room temperature. H2O is liquid. CO2 and SO2 are gas. Na2O is solid. So the Na2O has the highest melting point.

The solid having the highest melting point is Na₂O and the correct option is option 2.

The melting point of a solid is a measure of the temperature at which it changes from a solid to a liquid state. It is influenced by the strength of the intermolecular forces between the particles in the solid.

Na₂O(s), which is sodium oxide, has the highest melting point among the given options. This is because Na₂O is an ionic compound composed of positively charged sodium ions (Na⁺) and negatively charged oxide ions (O²⁻). Ionic compounds have strong electrostatic forces of attraction between the ions, known as ionic bonds. These bonds require a significant amount of energy to break, resulting in a high melting point.

H₂O(s) (water ice) has a lower melting point because it is a molecular compound held together by weaker hydrogen bonds.

SO₂(s) (sulfur dioxide) and CO₂(s) (carbon dioxide) are molecular compounds with weaker intermolecular forces, such as London dispersion forces, resulting in lower melting points compared to ionic compounds.

Thus, the ideal selection is option 2.

Learn more about Melting point of Solids, here:

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Carbon can bond with other carbon atoms to produce cyclic hydrocarbon structures.TRUE

FALSE

Answers

Answer:

The answer is True

Explanation:

Cyclic hydrocarbons are organic compounds that consist of carbon and hydrogen atoms that bond to form rings or cyclic structures. The simplest are cycloalkanes, hydrocarbons formed by a closed carbon chain with all the simple bonds.

There is a very special group of cyclic hydrocarbons called aromatic hydrocarbons. Its name is due to the fact that the first to be discovered had pleasant smells. They all start from a basic structure that can be repeated many times. An example of this type of hydrocarbon is bancene.

The statement about "Carbon can bond with other carbon atoms to produce cyclic hydrocarbon structures" is true. Carbon can also bond with other four atoms because of its outer shell (valence shell) that has four electrons. This is the reason why organic molecules can be so large because of this bonding.

What is produced when an acid reacts with a metal?a. Salt and hydrogen
c. Water and base
b. Carbon and salt
d. Carbon dioxide and water

Answers

Answer: Option (a) is the correct answer.

Explanation:

When an acid reacts with a metal then there occurs formation of a salt along with liberation of hydrogen gas.

For example, $Zn + 2HCl \rightarrow ZnCl_(2) + H_(2)$

Here, Zn (zinc) is the metal which when added to hydrogen chloride acid them it leads to the formation of salt zinc chloride and hydrogen gas.

This type of reaction is also known as single displacement reaction.

Thus, we can conclude that salt and hydrogen is produced when an acid reacts with a metal.

The answer should be A. The metal will replace the hydrogen as the cation which will result in the a salt and hydrogen gas. An example is Mg reacting with HCl which produces MgCl₂ (salt) and H₂ (hydrogen).

I hope this helps. Let me know if anything is unclear.

There are no negative consequences to using nuclear energy.

true or false