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2 years ago

"A base is a substance that produce OH-ions." Which definition of a base is this?

Chemistry

1 answer:

Andru [333]2 years ago

3 0

Answer:

C. Arrhenius

An Arrhenius base is a substance that dissociates in water to form hydroxide (OH–) ions. In other words, a base increases the concentration of OH– ions in an aqueous solution.

Explanation:

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How many atoms are in 1.50 moles of fluorine gas

evablogger [386]

1.8x10^24 atoms is How many atoms are in 1.50 moles of fluorine gas

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3 years ago

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 $\large \boxed{\textbf{1.5 h}}$}$

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2 years ago

The _______ is the area in which sediment is deposited along the shore. A. cove B. headland C. cave D. beach

Inessa05 [86]

The answer is d the beach

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3 years ago

Read 2 more answers

Okay, so I like this guy in my class and I think he likes me back because he glances at me every like minute or so and we hold e

leonid [27]

Answer:

I think he likes you or at least has some intrest in you

Explanation:

Guys aren't very direct when they like a girl so sometimes its hard to tell but usually a guy will playfully joke with you and be curious about your interests when he likes you

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2 years ago

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What mass of metallic silver can form from 1.147 g of copper metal according to equation b?

Arisa [49]

Answer:

$\large\boxed{\large\boxed{3.894g}}$

Explanation:

From similar question, equation (b) is

Molecular Equation:

Cu(s) + 2AgNO₃(aq) → Cu(NO₃)₂(aq) + 2Ag(s)

Net Ionic Equation:

Cu(s) + 2Ag⁺(aq) → Cu²⁺(aq) + 2Ag(s)

1. Mole ratio:

$\dfrac{2molAg(s)}{1molCu(s)}$

2. Convert 1.147 g of Cu(s) to moles:

Atomic mass of Cu: 63.546g/mol

Number of moles = mass in grams / atomic mass

Number of moles = 1.147 g / 63.546 g/mol = 0.01805 mol Cu(s)

3. Calculate the moles of Ag(s):

$0.01805molCu(s)\times \dfrac{2molAg(s)}{1molCu(s)}=0.03610molAg(s)$

4. Convert 0.03610 mol Ag(s) to grams:

Atomic mass of Ag(s) = 107.868g/mol

Mass = 0.03610mol × 107.868g/mol = 3.894g

4 0

2 years ago