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3 years ago

5

Identify the number of significant figures in each of these measurements of an object length: a. 76.48 cm b. 76.47 cm c. 76.59 c

m

1 answer:

ryzh [129]3 years ago

4 0

All of the measurements have 4

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Which of the following is true of electronegativity?

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Answer:

c) It describes the affinity an atom has for an electron.

Explanation:

C quite literally describes what electronegativity is, you can rule out most others by looking at periodic trends as attached below.

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9 months ago

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Liula [17]

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B)2:3

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1 year ago

Based on the reactivities of the elements involved, which reaction will form products that are more stable than the reactants?

MrRa [10]

Answer:

Exothermic reaction

Explanation:

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2 years ago

How much faster does ethane (C2H6) gas travel compared to chlorine gas?

zimovet [89]

Answer:

$\large \boxed{\text{54 $\, \%$ faster }}$

Explanation:

$v_{\text{rms}} \propto \sqrt{\dfrac{3RT}{M}$

if temperature is constant.

$v_{\text{rms}} \propto \sqrt{\dfrac{1}{M}$

if we are comparing two gases,

$\dfrac{v_{2}}{v_{1}} = \sqrt{\dfrac{M_{1}}{M_{2}}}$

Let chlorine be Gas 1 and ethane be Gas 2

Data:

M₁ = 70.91 g/mol

M₂ = 30.07 g/mol

Calculation

$\begin{array}{rcl}\dfrac{v_{2}}{v_{1}} & = & \sqrt{\dfrac{M_{1}}{M_{2}}}\\\\& = & \sqrt{\dfrac{70.91}{30.07}}\\\\& = & \sqrt{2.358}\\\\& = & \mathbf{1.54}\\\end{array}\\\text{Ethane molecules travel at 1.54 times the speed of chlorine molecules}\\\text{or $\large \boxed{\textbf{54 $\%$ faster }}$ than chlorine molecules}$

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2 years ago

Metamorphic rocks are formed by

marin [14]

Answer:

Heat and pressure.

Explanation:

Hope this helps!

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3 years ago