Farmers?!
Agricultural work was always done by the farmers, no matter what time period it was!
The answer for your question is D
Answer:
The answer to your question is below
Explanation:
Ionic bond is a kind of bond in which a metal attaches to a nonmetal. Also we know that a molecule has ionic bonding if the electronegativity is higher than 1.7.
Kind of elements Difference of electronegativity Bond
a) MgO Metal - Nonmetal 3.44 - 1.31 = 2.13 Ionic
b) SrCl₂ Metal -Nonmetal 3.16 - 0.95 = 2.21 Ionic
c) O₃ Nonmetal- Nonmetal 3.44 - 3.44 = 0 Covalent
d) CH₄O Nonmetal-Nonmetal 3.44 - 2.55 = 0.89 Covalent
Carbon, Hydrogen and oxygen are nonmetals
2) Silver coins can conduct electricity.
The mass of 63 ml sample : 79.38 g
<h3>Further explanation</h3>
Given
20 ml and 25.2 g of glycerol
Required
The mass of 63 ml sample
Solution
Density is the ratio of mass per unit volume
Density formula:
Density of glycerol :
= m : V
= 25.2 g : 20 ml
= 1.26 g/ml
Mass of 63 ml sample :
= density x volume
= 1.26 g/ml x 63 ml
= 79.38 g
Answer:
41. False
42. True
43. False
44. False
45. True
46 - 48. Unsure (I don't take Biology, sorry.)
Explanation:
41.
FeS and HCl are the reactants of the chemical equation. Hence, false.
42.
It is common knowledge that HCl and H₂SO₄ are acids. Hence, true.
43.
Vinegar contains acetic acid CH₃COOH, which isn't a base. Hence, false.
44.
Fluorescence is actually the emittance of light by <em>any substance</em> due to radiation. Hence, false.
45.
Yes, the image produced by a plane mirror is laterally inverted. Hence, true.
