Answer:
pluto is considered a dwarf planet because it did not meet the three criteria the IAU uses to define a full sized planet
Explanation:
The mass of C₂H₂ that would be produced by complete reaction of 3.75 g of calcium carbide is 1.524 grams
<u><em>calculation</em></u>
calcium carbide (CaC₂) react with water(H₂O) to produce C₂H₂ and Ca(OH)₂ according to reaction below
CaC₂ +2H₂O C₂H₂ + Ca(OH)₂
calculate the moles of CaC₂
moles = mass÷ molar mass
from periodic table the molar mass of CaC₂ = 40 + (12 x2) = 64 g/mol
moles is therefore =3.75 g÷ 64 g/mol =0.0586 moles
Use the mole ratio to determine the moles of C₂H₂
from equation above CaC₂: C₂H₂ is 1:1 therefore the moles of C₂H₂ is also
= 0.0586 moles
mass of C₂H₂ = moles x molar mass
from periodic table the molar mass of C₂H₂ = (12 x 2) + (1 x 2) = 26 g/mol
mass =0.0586 moles x 26 g/mol =1.524 grams
Answer:
A.
Explanation:
Base turns litmus paper blue. Answer A.
Answer:
0.882 ppm is the toxaphene concentration in the soil
Explanation:
One relation of units for ppm is mg/kg
Let's determine the mass of soil with the density.
Soil density = Soil mass / Soil volume
1700 kg / m³ = Soil mass / 1000 m³
1700 kg / m³ . 1000 m³ = Soil mass → 1.7×10⁶ kg
Let's convert the mass of toxaphene to mg
1.5 kg . 1 mg/ 1×10⁻⁶ kg = 1.5×10⁶ mg
1.5×10⁶ mg / 1.7×10⁶ kg = 0.882 ppm
The best steps that should always be used for effective problem solving would be C. Developing a plan and then implementing the plan.