Answer:
1. Because the rules will keep you safe it prevents you from getting hurt.
2.i) don't taste chemical
ii) Always wear protective gears
iii) be careful with tool
iv) wear protective gloves
Explanation:
help everyone get out quickly
Is there multiple choice?
Answer:
Li⁺, Na⁺ (group 1); N⁻³ (group 15)
Explanation:
Li and Na belong to group 1 of the periodic table so they coincide in the valence electrons which, being group 1, is a single electron.
They are very willing to lose it because they have little electronic affinity. In addition, both elements enter the alkali metal group (all of group 1)
They are cations, as they make ionic bonds.
N is an element from group 15. It is a nonmetal and has 5 electrons in its last layer as all the elements that make up its group, P, As, Sb so it would subtract 3 more electrons to have its last complete level and thus reach noble gas configuration.
Nitrogen can make covalent bonds, for example with O, where they form anions because it can gain electrons.
Answer:
22.75 ⁰C.
Explanation:
- The amount of heat added to a substance (Q) can be calculated from the relation:
Q = m.c.ΔT.
where, Q is the amount of heat added,
m is the mass of the substance,
c is the specific heat of the substance,
ΔT is the temperature difference (final T - initial T).
∵ The amount of heat released by Fe = the amount of heat absorbed by water
<em>∴ - (m.c.ΔT) released by Fe = (m.c.ΔT) absorbed by water.</em>
- (4.45 g)(0.45 J/g·⁰C)(final T - 101.0 ⁰C) = (50.0 g)(4.186 J/g·⁰C)(final T - 22.0 ⁰C)
- 2.0025 final T + 202.2525 = 209.3 final T - 4604.
209.3 final T + 2.0025 final T = 202.2525 + 4604
211.3025 final T = 4806.2525.
<em>final T = 4806.2525/211.3025 = 22.75 ⁰C.</em>
