Answer:
1) Add more sulfate ions.
2) 1 M K₂SO₄.
Explanation:
<em>1) Which of the following actions would shift this reaction toward solid barium sulfate?</em>
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- Le Châtelier's principle states that if a stress is applied to a system at equilibrium, the system will shift to relieve that stress and attain the equilibrium again.
Add more sulfate ions will increase the concentration of the products side, so the reaction will be shifted towards the reactants side to relieve the stress and attain the equilibrium again.
<em>So, the right choice is: Add more sulfate ions.</em>
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<em>2) In which of the following would barium sulfate be least soluble? </em>
The answer is 1 M K₂SO₄, it has a common ion effect of SO₄⁻ ions that increase the concentration of the products side, so the reaction will be shifted towards the reactants side to relieve the stress and attain the equilibrium again.
<em>So, the solubility will decrease.</em>
Mercury(II) oxide, a red solid, decomposes when heated to produce mercury and oxygen gas. Mercury(II) oxide is a red solid. When it is heated, it decomposes into mercury metal and oxygen gas. A reaction is also considered to be a decomposition reaction even when one or more of the products are still compounds.
Answer:
molar composition of oxygen =0.2 (20%)
molar composition of hydrogen = 0.8 (20%)
Explanation:
Since hydrogen and oxygen react according to
2*H₂+ O₂ → 2*H₂O
according to the ideal gas law:
P₁*V=n₁*R*T (initial state)
P₂*V=n₂*R*T (final state)
dividing both equations
P₁/P₂ = n₁/n₂
then since 2 moles of hydrogen react for every mole of oxygen that reacts, thus oxygen that reacted "no" is
no = (n₁-n₂) 1/(1+2) = n₁ (1-n₂/n₁)/3
then
molar composition of oxygen = xo= no/n₁ = (1-n₂/n₁)/3 = (1-P₂/P₁)/3 = (1-0.4 atm/1 atm )/3 = 0.2 (20%)
then
molar composition of hydrogen = xh= 1- xo = 0.8 (20%)
to verify it , the number of initial moles n₁=remaining hydrogen + hydrogen that reacted + oxygen that reacted
and since 2 moles of hydrogen react for every mole of oxygen that reacts n₁= n₂ + (n₁-n₂) (2/3) + (n₁-n₂) (1/3) = n₂ + (n₁-n₂) = n₁
Answer:
1 g sucrose, 16.4 g Na₂HPO₄, 1.5 g (NH₄)₃PO₄, 0.02 g CaCO₃, KNO₃, water to 1 liter and autoclave. This recipe is for a DEFINED BROTH medium.
Explanation:
A medium is classified as <u>defined</u> when it is known its exact composition ( we know which are all its ingredients). In this case, the medium contains sucrose as carbon source, salts (Na₂HPO₄, (NH₄)₃PO4,CaCO₃, KNO₃) as nitrogen and minerals sources, and water. Undefined media commonly contains animal or plant extracts, whose exact composition is unknown (we cannot know which quantity of salts, aminoacids and other components contains the extract). Furthermore, the medium lack of agar, which is a component which is added to make solid the medium. Thus, this medium is liquid and it is a <u>broth</u>. It does not contain reducing substances (so it is not a reducing medium) neither antibiotics (so it is not a selective medium).
