election circles the nucleus
Answer:
Melting of ice is a physical change and during this change latent heat of fusion, that is, heat required to convert 1 g of a solid substance into liquid state will keep the temperature constant unless and until all the solid changes into liquid. On the other hand, a change in which a new product is formed due to change in chemical composition of the reacting species is known as a chemical change. During a chemical change, there will occur change in temperature. So, when a substance is set on fire then there will occur change in temperature of the substance. Hence, it means it is a chemical change.
Explanation:
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The appropriate answer is d. recording and studying seismic waves. Seismic waves behave differently as the enter the different layers of the Earth. Scientists used seismic or earthquake waves to determine the different layers of the Earth. The behaviour of the waves as they move through the layers helped scientists identify the boundaries and the state of each layer; solid or liquid.
The temperature in in Celsius is 5826.85 degree Celsius and Fahrenheit is 10520.33.
To express temperature in kelvin and Celsius two different relations are used, The formula to convert Fahrenheit to Celsius we use the formula T(K) = (T(°F) + 459.67)× 5/9 here T(k) mean temperature in kelvin and T(F) is temperature in Fahrenheit so by putting the given data we get (6100 − 273.15) × 9/5 + 32 = 10520.33°F and so now we obtained the temperature in kelvin so to convert kelvin to Celsius we use this formula °C=K−273.15, so by putting the given data 6100 − 273.15 = 5826.85°C.Kelvin, Celsius and Fahrenheit are the three units to measure the temperature.
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Answer is: 0,0095 mol of hydrogen gas will be produced in reaction.
Chemical reaction: Ca + 2HCl → CaCl₂ + H₂.
m(Ca) = 0,38 g.
n(H₂) = ?
n(Ca) = m(Ca) ÷ M(Ca).
n(Ca) = 0,38 g ÷ 40 g/mol
n(Ca) = 0,0095 mol.
from reaction: n(Ca) : n(H₂) = 1 : 1.
n(H₂) = n(Ca) = 0,0095 mol.
n - amount of substance.
