Answer:
84%
Explanation:
2100 j out / 2500 j in = .84 = 84%
The possibility of metals replacing each other is dependent on the relative positions of the metals in the activity series.
The activity series is an arrangement of elements in order of decreasing reactivity. The elements that are higher in the series can displace the elements that are lower in the series.
Before we make a decision in each case, we must consider what metal is lower or higher in the series;
- Between Na and K, Na is lower in the series so the answer is no
- Between Co and Cu, Co is higher than Cu in the series so the answer is yes
- Since Zn and Zn^2+ are just a specie and its ion, the answer is no.
- Since Ba is higher than Ni, Ni can not replace Ba so the answer is no
Learn more: brainly.com/question/24058474
Hey there!
Compounds with ionic bonds have higher melting points because of the forces needed to break through the strong forces of attraction holding it together.
Compounds with covalent bonds have lower melting points because less energy is needed to break the weaker forces of attraction.
So, your answer is C. Compound 1 is ionic, and compound 2 is molecular.
Hope this helps!
Answer:
Wegener discovered that the Appalachian Mountains of the eastern United States, for instance, were geologically related to the Caledonian Mountains of Scotland. Pangaea existed about 240 million years ago. By about 200 million years ago, this supercontinent began breaking up
Answer:
Chemical reaction are irreversible. Some of the example of chemical reaction are cooking, rusting, and burning. During a chemical reaction, the composition of substances changes and the particles rearrange to form a new substance. The new substance formed after chemical reaction of substance has different physical and chemical properties.
When a chemical reaction occur, the atoms or molecules of the substances change its physical and chemical properties such as while cooking of vegetable, the molecules of vegetable undergo changes in their properties and form a new substance which is different from the earlier.
