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# Science

Richard Grimes

Lvl 9
2021-10-05 18:33:55
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Cards in this guide (20)
What is technology

Science applied to practical problems (Apex)

An isotope of cesium-137 has a half-life of 30 if 1.0 g of cesium-137 disintegrates over a period of 90 years how many g of cesium-137 would remain

1/8th of a gram.

You compute it like this: After 30 years, half of the original amount would remain (1/2-gram). After another 30 years, half of that half would remain (1/4-gram). After the remaining 30 years, half of the 1/4-gram would remain, or 1/8-gram.

Wikipedia has a simple table and explanation as well:

http://en.wikipedia.org/wiki/Half-life

How has technology changed farming

What is the responsibility of a scientist

to study the pyhsical world

Why is it important for scientist to state a conclusion

To clearly state why the experiment was performed

What is the purpose of genetically modified crops

Increasing food production

Which activity would be within the field of biology

Figuring out how pesticides affect plant growth is within the field of biology.

How did scientists change society's view of smoking after 1960

-- they showed that smoking causes cancer :)

kymmie

Which is a result of a seasonal change

Rabbits changing fur color APEX*

Does radiosotope 14c and 12c have the same number of protons

Yes of course

In a controlled experiment what is the experimental group compared to

expermental group (APEX)

What is the purpose of technology

Solving Problems. (APEX)

What is true of an Arrhenius acid

An Arrhenius acid donates H+ ions. (apex).

What property should a radioactive used for dating have

its half life should be similar to the age of the fossil

What is the average for the following set of measurements 3.1mL 2.7mL 4.6mL 1.9mL 8.7mL

Average = Sum/Count = 21 mL/5 = 4.2 mL.

What will a hypothesis become if it is supported by repeat experimentation

A proven hypothesis becomes a theory.

Some technologies have a number of negative effects. Which is a negative outcome of the technology of vertical farming

rural farmers may lose their income

If scientists want to solve an environmental problem they are most likely to use .

technology

Which question can be answered using the scientific process

How much water does it take to make a plastic bag

Which human activity negatively affects the stability of the environment

Cutting down all trees in a forest

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