How does a straight-chain alkane that has five carbon atoms differ from a cycloalkane that has five carbon atoms?
the straight-chain alkane has at least one double or triple bond, but the cycloalkane has only single bonds.
the straight-chain alkane has only single bonds, but the cycloalkane has at least one double or triple bond.
the straight-chain alkane has two more hydrogen atoms than the cycloalkane.
the straight-chain alkane has two fewer hydrogen atoms than the cycloalkane.

The straight-chain alkane has two more hydrogen atoms than the cycloalkane.

Explanation:

1(General chemical formula for straight-chain alkane

Given : Alkane with five carbon atoms

Chemical formula of the alkane will be

From the chemical formula, there are 12 hydrogen atoms in a given alkane.

2)General chemical formula for cycloalkanes

Given : Cycloalkane with five carbon atoms

Chemical formula of the cycloalkane will be

From the chemical formula, there are 10 hydrogen atoms in a given cycloalkane.

From both the chemical formulas we can say that straight-chain alkane has two more hydrogen atoms than the cycloalkane.

when 25.0 ml of 0.700 mol/l naoh was mixed in a calorimeter with 25.0 ml of 0.700 mol/l hcl, both initially at 20.0 °c, the temperature increased to 22.1 °c. the heat capacity of the calorimeter is 279 j/°c.

the equation for the reaction is:

naoh + hcl → nacl + h₂o

moles of hcl = 0.0250 l hcl ×

0.700

mol hcl

1 l hcl = 0.0175 mol hcl

volume of solution = (25.0 + 25.0) ml = 50.0 ml

mass of solution = 50.0 ml soln ×

1.00

ml soln

= 50.0 g soln

δt=t2-t1

= (22.1 – 20.0) °c = 2.1 °c

the heats involved are

heat from neutralization + heat to warm solution + heat to warm calorimeter = 0

q1+q2+q3=0

nδh+mcδt+cδt=0

0.0175 mol ×

δh

+ 50.0 g × 4.184 j·g⁻¹°c⁻¹ × 2.1 °c + 279 j°c⁻¹ × 2.1 °c = 0

0.0175 mol ×

δh

+ 439.32 j + 585.9 j = 0

0.0175 mol ×

δh

= -1025.22 j

δh=1025.22j0.0175 mol= -58 600 j/mol = -58.6 kj/mol

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.