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Iteru [2.4K]
3 years ago
5

what does NaBr + Ca(OH)2 -> CaBr2 + NaOH create? is it a physical or chemical or physical? for an example for what does it cr

eate: like rust
Chemistry
1 answer:
konstantin123 [22]3 years ago
8 0

<u>Answer:</u> The given reaction is a chemical change and equation for rust is given below.

<u>Explanation:</u>

A chemical change is defined as the change where a change in the chemical composition takes place and results in the formation of a new substance. These reactions are usually an irreversible reaction.

A physical change is defined as the change in the shape and size of a substance. No change in the composition of a substance takes place as no new substance is formed. These reactions are usually reversible reaction.

For the given reaction:

2NaBr+Ca(OH)_2\rightarrow CaBr_2+2NaOH

The given reaction is a chemical change because new substances are being formed. This is an example of double displacement reaction because exchange of ions is taking place.

The formation of rust is also a chemical change because a reddish-brown coating on iron metal is being formed which is the rust. The equation for the following chemical change is:

4Fe(s)+3O_2(g)\rightarrow 2Fe_2O_3(s)

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What is the enthalpy of formation (?H?f) of NaHCO3(s) from its constituent elements.
vova2212 [387]

Answer:

Enthalpy of formation = -947.68KJ/mol

Explanation:

Enthalpy of formation is the heat change when one mole of a substance is formed from its element in its standard states and in standard conditions of temperature and pressure. it may be positive or negative, if positive, it is an endothermic reaction where the heat content of the product is greater than that of the reactants, and if negative, it is exothermic reaction - where the heat content of the reactants is greater than the products. the enthalpy of formation is measured in KiloJoule/Moles (KJ/Mole).

From the value of the enthalpy of formation of NaHCO3, it shows that the reaction is exothermic, that is the formation of NaHCO3 from its constituents elements. As such, the heat content of the reactants is greater than the products.

The step by step explanation is shown in the attachment.

7 0
3 years ago
Read 2 more answers
What is the temperature of a water body containing a 90% saturation and 11.5 ppm of dissolved oxygen?
ozzi
Using the chart that has been provided, we may determine water temperature. We do this by drawing a straight line form the bottom scale which has the ppm of oxygen dissolved to the middle scale which has the percentage saturation.

The line starts from 11.5 ppm on the bottom scale and goes to 90% on the middle scale. Next, we continue this line, without changing its slope, to the third scale showing temperature. We see that it crosses the temperature scale at 4°C.

The temperature of the water is 4 °C.
6 0
3 years ago
How many grams of lithium hypochlorite (LiClO) are there in 0.594 moles?
Flauer [41]

Answer : The mass of lithium hypochlorite are, 34.7 grams.

Explanation : Given,

Moles of LiClO = 0.594 g

Molar mass of LiClO = 58.4 g/mol

Expression used :

\text{ Mass of }LiClO=\text{ Moles of }LiClO\times \text{ Molar mass of }LiClO

Now put all the given values in this expression, we get:

\text{ Mass of }LiClO=(0.594moles)\times (58.4g/mole)

\text{ Mass of }LiClO=34.7g

Therefore, the mass of lithium hypochlorite are, 34.7 grams.

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3 years ago
A powdered drink mix is stirred into a glass of water to form a solution. If any more is added it will not dissolve
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SaturTED, hope this helps, m8
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3 years ago
nuclear reactions can be written out in equation form with information about the nuclei that are produced. in one to two sentenc
Umnica [9.8K]

Nuclear fusion involves the combination of two light nuclei to form a heavier nucleus with emission of energy.

A nuclear reaction equation is a representation of the change that takes place as one nucleus is converted to another. A nuclear transformation could be any of the following;

  • Nuclear fission
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We can know that a nuclear fusion is taking place when two nuclei come together to form a larger nucleus and emit energy. I would identify a nuclear fusion when;

  • Two light atom combine to give a larger nucleus
  • Tremendous energy is produced

Learn more: brainly.com/question/1527403

7 0
3 years ago
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