Of the following, which is most likely to result after a farmer sprays his crops with pesticides?D. A neighbor’s well tests positive for pesticides.
Carbon dioxide is a colorless, odorless gas. Why is it considered a pollutant?
A. It gets into natural waters and kills fish.
Answer:
Metallic character refers to the level of reactivity of a metal. Non-metallic character relates to the tendency to accept electrons during chemical reactions. Metallic tendency increases going down a group. Non-metallic tendency increases going from left to right across the periodic table.
Explanation:
Options are as follow,
<span>A) Covalent bonds are formed by metals and nonmetals.
B) Covalent bonds are are typical of carbon compounds.
C) Covalent bonds are created by the attractions between oppositely charged ions.
D) Covalent bonds break apart when dissolved in water and allow for the conduction of electricity.
</span><span>Answer:
Covalent bonds are formed by mutual sharing of electrons between two atoms of having electronegativity difference less than 1.7. Among given options only option-B seems correct.
Explanation:
Carbon containing compounds are almost covalent in nature. Majority of organic compounds are made up of carbon, hydrogen, oxygen and nitrogen. And carbon makes covalent bonds with all these atoms.
Result:
</span>Option-B is correct.
Answer:
The answer to your question is: = 2.52 x 10²¹ molecules
Explanation:
mass of fuel = 13.56 - 13.53 = 0.04 g of fuel
mass of oxygen = ?
mass of water = 0.054 g
mass of carbon dioxide = 0.1198 g
To solve this problem just remember the Lavoisier law of conservation of mass that says: Mass is neither created nor destroyed in chemical reactions,
Reaction:
Fuel + Oxygen ⇒ Water + Carbon dioxide
0.04 + mass O2 ⇒ 0.054 + 0.1198
mass O2 = 0.054 + 0.1198 - 0.04
mass O2 = 0.1338 g
MW O2 = 32
1 mol of O2 -------------------- 32 g
x ------------------- 0.1338g
x = 0.1338(1) / 32 = 0.0042 moles
1 mol ----------------- 6,023 x 10 ²³ molecules
0.0042 moles ----- x
x = 0.0042 (6,023 x 10 ²³ ) / 1 = 2.52 x 10²¹ molecules
True. A mole of anything has the same amount of molecules. 1 mole = 6.022 x 1023 molecules