Which statement about moons is NOT true?*

Coefficient of balanced equation: __Fe + ___020) — _Fe_036)

lesya [120]

Answer:

- Four for iron, three for oxygen and 2 for iron (III) oxide:

$4Fe+3O_2\rightarrow 2Fe_2O_3$

Explanation:

Hello,

In this case, the oxidation of iron is a widely acknowledged reaction occurring in ships and other machines exposed to the air or highly oxidizing medias. Thus, by the effect of oxygen, iron undergoes oxidation typically to iron (III) oxide:

$Fe+O_2\rightarrow Fe_2O_3$

Nonetheless, the law of conservation of mass must be respected, therefore the coefficients balancing the reaction are four for iron, three for oxygen and 2 for iron (III) oxide:

$4Fe+3O_2\rightarrow 2Fe_2O_3$

Best regards.

3 0

4 years ago

Energy can generally be considered to be either kinetic energy or potential energy. Some specific forms of energy, such as elect

goldenfox [79]

All energy can generally be considered to be either kinetic energy or potential energy. Some specific forms of energy, such as electrical, magnetic, and gravitational energy, can operate in the space around objects and affect other objects that come near. So, the correct answer is B, I believe. :)

4 0

3 years ago

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Dax has been learning about chemical reactions, and he now understands that chemical reactions occur at different rates. Some ar

patriot [66]

Answer:

concentration
temperature
surface area (for solid reactants ONLY)
pressure (for gaseous reactants ONLY)
catalyst

Explanation:

Concentration- rate of the reaction increases with the increase of concentration of the reactants. More particles per unit volume leads to the frequency of collisions to increase. The number of successful collisions thereby increase and overall, lesser time is needed to complete the reaction (upon a higher concentration)
Temperature- With the increase of temperature, rate of reaction increases. Particles have more kinetic energy and they move faster. Due to this, number of successful collisions increases/number of effective collisions increases. More particles have energy greater than the activation energy and, activation energy can't change. If number of moles are changed, then number of product will vary.
Surface Area- Rate of reaction increases with the increase of surface area of the solid reactant. More particles are exposed to react and the frequency of collisions increases. Less time is needed to complete the reaction and with the decrease of size, surface area increases.
Pressure- Rate of reaction increases with the increase of pressure of the gaseous reactants. Gas molecules are closer/ more particles per unit volume is found. The frequency of collisions increase and number of effective collisions increases.
Catalyst- Substances which can speed up a chemical reaction by lowering the activation energy by creating an alternative route are called catalysts. They take part in a chemical reaction but after the reaction, they remains chemically unchanged. Catalysts can change the value of enthalpy change and increases both forward and backward reaction rates. They can't change the yield of a chemical reaction and can't change the equilibrium composition. (ex: usage of Vanadium (V) Oxide to manufacture sulfuric acid).

7 0

3 years ago

Name the reaction & mechanism of the following reactions:

gtnhenbr [62]

Answer:

double displacement reaction

6 0

3 years ago

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Which of the following is a chemical reaction?

stiv31 [10]

Answer:

d. The formation of a covalent bond between two amino acids

Explanation:

In a chemical reaction, a substance transforms into another with different chemical properties and a different formula. Bonds are created and/or destroyed. It must obey the law of conservation of mass and the law of conservation of elements.

Which of the following is a chemical reaction?

a. Making a hydrogen bond between a water molecule and a sugar molecule. NO. This is a physical change in which sugar dissolves in water but both their chemical identities remain the same. The hydrogen bond is a force of attraction and not a real bond in which electrons are gained, lost or shared.

b. The melting of ice. NO. This is a physical change. Solid water turns into liquid water but the identity of the molecules is the same.

c. Changing a carbon atom to a nitrogen atom by radioactive decay. NO. This is a nuclear reaction in which a new element appears but it is not a chemical reaction because it does not fulfill the law of conservation of elements.

d. The formation of a covalent bond between two amino acids. YES. A new bond is created and a protein dimer is formed.

4 0

3 years ago