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schepotkina [342]

2 years ago

5

The Tisza-Danube cyanide spill is an example of all of the following except a general pollution. b accidental pollution. c point

-source pollution. d transboundary pollution.

1 answer:

Serjik [45]2 years ago

4 0

Answer: Its B!

Explanation:

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Question 7 (2 points)

serg [7]

Answer:

C. decrease the velocity.

4 0

2 years ago

Uranium – 235 has a half-life of 713 million years. Would uranium – 235 or carbon – 14 be more useful for dating Cambrian time e

kenny6666 [7]

Uranium-235 would be more useful for dating in Cambrian time because Cambrian time was 540 million years ago while the half life of carbon-14 is only 5,730 years
Hope this helps

6 0

2 years ago

What are the three physical properties of gases

daser333 [38]

They are described through the use of four physical properties or macroscopic characteristics: pressure, volume, number of particles (chemists group them by moles) and temperature.

5 0

3 years ago

Read 2 more answers

After decaying for 48 hours, one-sixteenth (1/16) of the original mass of a radioisotope sample remains unchanged. What is the h

Hunter-Best [27]

The half-life of this radioisotope : 12 hr

<h3>Further explanation </h3>

The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.

Usually radioactive elements have an unstable atomic nucleus.

General formulas used in decay:

$\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}$

t = duration of decay

t 1/2 = half-life

N₀ = the number of initial radioactive atoms

Nt = the number of radioactive atoms left after decaying during T time

t=48 hr

$\tt \dfrac{Nt}{No}=\dfrac{1}{16}$

The half-life :

$\tt \dfrac{1}{16}=\dfrac{1}{2}^{(48/t\frac{1}{2} )}\\\\(\dfrac{1}{2})^4=(\dfrac{1}{2})^{48/t\frac{1}{2}}\\\\4=48/t\frac{1}{2}\\\\t\frac{1}{2}=12~hr$

7 0

2 years ago

A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 1.79 g/mL, 1.8

ivann1987 [24]

Answer:

her results has good precision

Explanation:

accuracy and precision

4 0

3 years ago