by sign convention Δ
is negative it means an exothermic reaction where the heat is lose so the temperature decreases.
Answer:
The answer to your question is: letter A
Explanation:
a.Strong electrical forces will make ionic compounds have high boiling points. This option is correct because ionic bonds are strong which makes substances have high boiling points.
b.Strong electrical forces will make ionic compounds have weak bonds. This option is false, ionic compounds have strong bonds.
c.A low amount of energy is needed to break the bonds in ionic compounds. The high amount of energy is needed to break ionic bonds.
d.Gravitational forces hold the bonds together in ionic compounds. Gravitational forces do not affect the ionic compounds.
Answer:
Density = 11.4 g/cm³
Explanation:
Given data:
Density of lead = ?
Height of lead bar = 0.500 cm
Width of lead bar = 1.55 cm
Length of lead bar = 25.00 cm
Mass of lead bar = 220.9 g
Solution:
Density = mass/ volume
Volume of bar = length × width × height
Volume of bar = 25.00 cm × 1.55 cm × 0.500 cm
Volume of bar = 19.4 cm³
Density of bar:
Density = 220.9 g/ 19.4 cm³
Density = 11.4 g/cm³
Answer:
Number of moles of methane form = 2.3 mol
Explanation:
Given data:
Number of moles of Hydrogen = 4.6 mol
Number of moles of methane form = ?
Solution:
Chemical equation:
C + 2H₂ → CH₄
Now we will compare the moles of methane with hydrogen from balance chemical equation.
H₂ : CH₄
2 : 1
4.6 : 1/2×4.6 = 2.3 mol
Form 3.6 moles of hydrogen 2.3 moles of methane can be formed.
