A covalent compound<span> is made when two or more nonmetal atoms </span>bond<span> by sharing valence electrons. The shared valence electrons between two nonmetal atoms is</span>called<span> a </span>covalent bond<span>. </span>Covalent bonds<span> are </span>formed<span> when two atoms begin sharing electrons.</span>
Answer:
Milk
Explanation:
Typically, the lower a substance is on the pH scale, the higher its acidity is and the higher the H+ concentration is. Conversely, the higher a substance is on the pH scale, the more basic it is and the lower the H+ concentration is. To be considered an acid, a substance has to be below 7 on the pH scale, since 7 is neutral. The highest substance on the pH scale that is still below 7 is milk, with a pH of about 6.5. Therefore, this is the answer. Hope this helps!
Answer:
a) 4480L
b) 56L
Explanation:
To answer this question you need to know that Cl2 molecular weight is 71 g/mol and gas volume at NTP is 22.4 L/mol.
a) 14.2 kg of Cl2 in moles will be: 14.2 kg * (1000g/kg) / ( 71g/mol)= 200 mol
The volume of 200 mol of gas in NTP will be: 200 mol * 22.4L/mol= 4480L
b) every mol is made of 6.02 * 10²³ molecules. Then the volume of the gas will be: (15,055×10²³ molecule) / (6.02 * 10²³ molecules/mol) * 22.4 L/mol= 56L
Exothermic reactions are chemical reactions that proceed with the release of heat energy. I contrast, endothermic reactions involve absorption of heat.
The enthalpy change (ΔH) for exothermic reactions is negative while that of endothermic reactions is positive.
In the given examples, reactions that show a negative ΔH are:
NH3 + HCl ------- NH4Cl ΔH = -176 KJ/mol
2Mg + O2 -------- 2MgO ΔH = -1203 kj/mol
C + O2 ---- CO2 ΔH = -393.5 kj/mol
CH4 + 2O2 ----------------- CO2 + 2H2O ΔH = -891 kj/mol
Answer:
magnesium oxide is greater than the mass of the magnesium.