Answer:
balanced;
unbalanced;
unbalanced;
balanced;
Explanation:
CaO + 3C → CaC2 + CO //all elements are balanced
Na + H2O → 2NaOH + H2 //Na is not balanced on the left
4Fe + O2 → 2Fe2O3 //O is not balanced on the left
2Mg + O2 → 2MgO //left is equal to right, balanced
There are 12 protons and 10 electrons in a <span>Mg2+</span> ion, the normal amount of neutrons is 12<span>.
</span>Explanation:
Magnesium is an element with atomic number 12. This means that every magnesium atom will have 12 protons.
In a magnesium atom, there are 12 electrons, to make the atom have a neutral charge. When an ion is formed, the magnesium atom loses electrons. The <span>2+</span>charge shows that the magnesium ion has two more protons than electrons. The proton number for magnesium does not change, so <span>Mg<span>2+</span></span> must have two less electrons, i.e. 10 electrons.
The number of neutrons varies among different isotopes of magnesium. An isotope of an element means it just has different amounts of neutrons.
The most common isotope of magnesium is <span>24Mg</span>. This 24 indicates the total number of protons and neutrons. Magnesium has 12 protons, so must have
<span>24−12=12 neutrons</span>
Other isotopes of magnesium have different numbers of neutrons, i.e. <span>25Mg</span> has 13neutrons, <span>26Mg</span> has 14 neutrons. <span>24Mg</span> is most likely being referred to in the question, though.
<u>Answer:</u> The value of 
for the given chemical reaction is 0.1415
<u>Explanation:</u>
Equilibrium constant in terms of partial pressure is defined as the ratio of partial pressures of the products and the reactants each raised to the power their stoichiometric ratios. It is expressed as
For a general chemical reaction:
The expression for is written as:
For the given chemical equation:
The expression for for the following equation is:
We are given:
Putting values in above equation, we get:
The value of for the given chemical reaction is 0.1415
Answer:
This stiffening process, called Rigor Mortis, has a roughly known time of occurrence and can therefore be used to estimate time of death. In general: If the body feels warm and no rigor is present, death occurred under 3 hours before. If the body feels warm and stiff, death occurred 3-8 hours earlier.
Answer:
The answer is "From Chemical to Mechanical.".
Explanation:
In this question, chemical energy is an organic compound that includes contains energy from certain chains for the exergonic responses that happen when fuels emitters inside the form of heat throughout a chemical process, in which the skin converts the chemical energy in food into mechanical energy and heat.
