Answer:
Las fuentes de luz primarias son aquellas que emiten la luz que producen. Por ejemplo: la luz de Sol, un relámpago, la de una vela,...
A su vez las fuentes primarias las podemos clasificar en: fuentes naturales y fuentes artificiales
Explanation:
<h2>Hello!</h2>
The answer is: H2O
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Why?</h2>
The critical temperature (also known as the critical point) is the temperature above a vapor or gas can't be liquefied no matter how many pressure can be applied. Every substance has a critical temperature which varies according to the substance/compound nature.
For example, the water has a critical temperature of 373.94 °C, it means that above that temperature the vapor and liquid phases can't be distinct and there is no possible way that the vapor became liquid again no matter how many pressure is applied.
The critical temperature of the given elements/compounds are:
H2 : -240 °C
N2: -147 °C
NH3: 132.4 °C
H2O: 373.94 °C
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Answer: of liquid sodium is required.
Explanation: To calculate the mass of liquid sodium, we use the formula:
where,
q = heat required, (Conversion factor: 1MJ = 1000000J)
m = Mass of liquid sodium,
M = Molar mass of liquid sodium,
c = Specific heat capacity,
= change in temperature, (Conversion factor: 0°C = 273K)
Putting values in above equation, we get:
Answer: A) 1
Explanation:
Lithium is the third element of the periodic table with atomic number of 3. The atomic number is equal to the number of electrons for a neutral atom and thus there are 3 electrons in Lithium.
The electronic configuration of Lithium (Li) is . Thus it can gain one electron to complete its octet and attain stability. Thus it can form one bond with other atoms.
Example: Lithium can form one bond with flourine to form LiF by losing one electron to form .
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☃ The chemical reaction in which heat is released to the surroundings is called exothermic reaction. The amount of heat energy released is written along with products. This indicates that heat is given out.
- C + O₂ ⇾ CO₂ + Heat
- CaO + H₂O ⇾ Ca ( OH )₂ + Heat
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