Answer:
The volume of the liquid should be measured before it is heated.
Explanation:
Answer:
Chemical
Explanation:
The change was chemical, because it can no longer be returned to the original form. You cannot get back the bubbles or fizz from the air.
The nucleus controls and regulates the activities of the cell and carries the genes, structures that contain the hereditary information.
Answer:
1. Balanced
2. Unbalanced
3. Unbalanced
Explanation:
<em>Identify which of the following oxidation-reduction reactions are balanced and which are unbalanced in both mass and charge.
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<em>1. Ag⁺(aq) + Li(s) → Ag(s) + Li⁺(aq)
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This reaction is balanced in both mass and charge.
<em>2. Fe(s) + Na⁺(aq) → Fe²⁺(aq) + Na(s)
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This reaction is balanced in mass but unbalanced in charge since the charge to the left is +1 and the charge to the right is 2+.
<em>3. K(s) + H₂O(l) → KOH(aq) + H₂(g)</em>
This reaction is balanced in charge but unbalanced in mass since there are 2 atoms of H to the left and 3 atoms of H to the right.
Answer:
1.33 moles per second
Explanation:
From the balanced equation of reaction, 3 moles of H2(g) need to disappear/be consumed before 2 moles of NH3(g) can be formed/appear.
<em>According to reaction law, the rate of disappearance of reactants is equal to the rate of appearance of products.</em>
Now, only 2 moles per seconds of H2 has disappeared initially;
3 moles H2 is needed for 2 moles NH3
2 moles H2 will give; 2 x 2/3 = 4/3 or 1.33 moles
<em>Hence, if the initial rate of disappearance of H2 is 2.0 moles per second, the initial rate of appearance of NH3 would be </em><em>1.33 moles per second.</em>
