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mash [69]
3 years ago
10

Which statement represents the way a scientist may make a

Chemistry
2 answers:
Karo-lina-s [1.5K]3 years ago
7 0
The answer is A
Hoped it helped!
monitta3 years ago
4 0
A) A scientist makes a prediction, makes an observation, n then asks a scientific question
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Mention any two uses of oxygen gas.​
Elodia [21]

Answer:

steel, plastics

<h3>Explanation:</h3>

Hope it helps!

3 0
3 years ago
6. 5.50 x 10- molecules of carbon dioxide to moles.
sergeinik [125]
1.24973017189471 is probably the answer to your equation
4 0
2 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 $\large \boxed{\textbf{1.5 h}}$}

4 0
3 years ago
Can Intrusive and Extrusive Igneous rocks form from the same mineral composition?
Annette [7]
No I can’t
EXAMPLE took the test k12
3 0
3 years ago
Using molecular orbitals, determine if the following cycloaddition of 1,3-butadiene and allyl anion is thermally allowed. heat ?
ASHA 777 [7]

Answer: cycloaddition of 1,3-butadiene and allyl anion is thermally allowed.

Explanation:

Using the frontier molecular orbital approach, we consider if the symmetry of the LUMO of the diene (1,3-cyclobutadiene) and the HOMO of the dienophile allyl anion), match each other since the diels alder reaction is a symmetry allowed process. The symmetries of these frontier molecular orbitals match each other hence the reaction is thermally allowed. It should be notes that 4+2 cycloadditions are thermally allowed although they are slow.

4 0
3 years ago
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