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3 years ago

The picture shows a scientist collecting data from an ice core whats the answer giving brainliest

Chemistry

1 answer:

ziro4ka [17]3 years ago

5 0

Answer:

Explanation:

Gas change and climate change are very similar and thats why its c

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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

_________solution contains sodium hydroxide and copper sulphate

Archy [21]

Biuret reagent. This is the answer

8 0

3 years ago

Read 2 more answers

(?)Li2O + (?)H2O → (?)LiOH

pav-90 [236]

Answer:

Li2O+H2O---->(2)LiOH

Explanation:

you have to balance the equation and not all the blanks have to be filled all the time but if it makes it easier for you in the first 2 question marks you can put a 1 which isnt necessary but if ur a visual person it will help.

hope this helps im litterally learning the same thing as u lol

6 0

3 years ago

Which best describes a chain reaction associated with a nuclear reaction A Neutrons released during a fusion reaction cause othe

Gnoma [55]

Answer:

Neutrons released during a fission reaction cause other nuclei to split

7 0

3 years ago

A block of wood has a density of 0.6g/cm cubed and a volume of 1.2g/cm cubed. What is the mass of the block of wood?

Rus_ich [418]

0.6 = mass/1.2 
mass = 0.6 x 1.2 
= 0.72 g

3 0

3 years ago