Answer:
9.64g/mL
Explanation:
Given parameters:
Mass of the metal = 106g
Volume of cylinder = 50mL
Volume difference = 31mL - 20mL = 11mL
Unknown:
Density of the metal = ?
Solution:
To find the density of the metal, we use;
Density = 
Density = 
= 9.64g/mL
Answer:
3.5hrs
Explanation:
Using the formula Speed = Distance/Time
Given
Speed = 8mi/hr
Distance = 28miles
Get the time
Time = Distance/Speed
Time = 28/8
Tme = 3.5hrs
Hence it will take 3.5hrs to travel
That would be choice A.
Protons and Neutrons.
Transfer of electrons from one species to another species is called a redox reaction. it consists of one species that will give out electrons called an oxidation reaction and the other species take in electrons called reduction reactions. both these half equations together make up a redox reaction.
In oxidation, the oxidation state increases of the species that is oxidised.
In reduction, oxidation state of the species decreases of the species that is reduced.
1)
2AgNO₃(aq) + Cu(s) → Cu(NO₃)₂<span>(aq) + 2Ag(s)
single displacement reaction
oxidation number of Ag </span>decreases from +1 to 0 - reduction reaction
oxidation number of Cu increases from 0 to +2 - oxidation
since both oxidation and reduction reactions take place its a redox reaction.
2)
BaCl₂(aq) + Na₂CrO₄(aq) → BaCrO₄<span>(s) + 2NaCl(aq)
its a double displacement reaction and the ions have been exchanged.
Oxidation numbers of the elements do not change therefore this is not a redox reaction.
3)
</span>H₃PO₄(aq) + 3KOH(aq) → 3H₂O(l) + K₃PO₄<span>(aq)
acid base reaction where the oxidation state of the elements remain the same so its not a redox reaction.
4)
</span><span>CaCO</span>₃<span>(s) → CaO(s) + CO</span>₂<span>(g)?
decomposition reaction where the oxidation states remain the same hence not a redox reaction </span>
Answer:
NaOH
Explanation:
NaOH is called base because it dissociates completely in aqueous solution to form hydroxide ion(OH-) and sodium cation (Na+). When it react with an acid , it produce sodium salt and water. It is a strong base because it dissociates completely.
