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Simora [160]
3 years ago
8

Which statement correctly describes a covalent bond?  The valence electrons are joined in a shell around the atoms. The valence

electrons are shared between the atoms. The valence electrons are transferred from one atom to the other. The valence electrons are divided between the atoms.
Chemistry
1 answer:
Vedmedyk [2.9K]3 years ago
4 0
The valence electrons are shared between the atoms
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What is the half-life of a pharmaceutical if the initial dose is 500 mg and only 31 mg remains after 6 hours?
Sergeu [11.5K]

Answer:

\large \boxed{\text{b. 1.5 h}}

Explanation:

1. Calculate the rate constant

The integrated rate law for first order decay is

\ln \left (\dfrac{A_{0}}{A_{t}}\right ) = kt

where

A₀ and A_t are the amounts at t = 0 and t

k is the rate constant

\begin{array}{rcl}\ln \left (\dfrac{500}{31}\right) & = & k \times 6\\\\\ln 16.1 & = & 6k\\2.78& =& 6k\\k & = & \dfrac{2.78}{6}\\\\& = & 0.463 \text{ h}^{-1}\\\end{array}

2. Calculate the half-life

t_{\frac{1}{2}} = \dfrac{\ln2}{k} = \dfrac{\ln2}{\text{0.463  h}^{-1}} = \textbf{1.5 h}\\\\ \text{The half-life is $\large \boxed{\textbf{1.5 h}}$}

4 0
3 years ago
A reaction is spontaneous if delta G is <br> 1)positive <br> 2)negative <br> 3)zero
miskamm [114]

delta g must be negative in order for the reaction to be spontaneous bb ♡

4 0
3 years ago
Read 2 more answers
Which statement describes the Arrhenius interpretation of acids and bases?
Vilka [71]

Answer:

See Explanation

Explanation:

Note => 1st one should understand that for an 'acid' to be an acid and a 'base' to be a base, two requirements must be met, (1) the compound must have an ionizable Hydrogen for acids or Hydroxide for bases, and (2) must be in water and ionize delivering H⁺ ions from acids and OH⁻ ions from bases. The  Arrhenius acids are characterized by having an ionizable hydrogen which when added into water increases the hydronium ion concentration (H₃O⁺). Arrhenius bases are characterized by having an ionizable hydroxide function (OH-).

Typically, the acids and bases are characterized as either strong or weak  electrolytes. the Strong electrolytes ionize 100% in water and Weak electrolytes less than 100%.

The strong acids include HCl, HBr, HI, HNO₃, HClO₄ and H₂SO₄ (1st ionization step). Any acid (H-Anion) not a member of the strong 6 is a weak acid.

The strong Arrhenius Bases are Group IA and Group IIA Hydroxides except for Beryllium Hydroxide. Weak Arrhenius Bases are ammonia or ammonia derivatives (amines) in water.  

=> NH₃ + H₂O => NH₄OH ⇄ NH⁺ + OH⁻.

The ammonia derivatives follow the same reactive nature in water.

=> RNH₂ + H₂O => RNH₃OH ⇄ RNH₃⁺ + OH⁻ where R- is a structural substrate; e.g., Methyl Amine => H₃C - NH₂ .

5 0
3 years ago
Carl hits a baseball with a force of 8 N. The next batter, Stacy, hits it with 12 N of force. Which ball will accelerate faster?
Kisachek [45]

Answer:

The ball hit with 12 N

Explanation:

acceleration = Force/ mass

If masses of balls are the same, then more the force -  more acceleration.

12N more than 8N,

so the ball that hits Stacy accelerate faster.

8 0
3 years ago
Read 2 more answers
How many nitrogen atoms are in 4.26 moles of ammonium
svlad2 [7]
Answer



0.6800 mol N.
7 0
3 years ago
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