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3 years ago

6

Can someone please name a project I can do for my science fair for 7th grade I need a easy one

1 answer:

avanturin [10]3 years ago

7 0

I know one it is with matter

You can do a mixture by making a fruit salad

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If the volume of a solid is 100cm^3 and its mass is 400 g, what is it’s density

Aleksandr-060686 [28]

Answer:

The answer to your question is: density = 4 g/cm³

Explanation:

Data

Volume = 100 cm³

Mass = 400 g

Density = ?

Formula

density = mass/volume

substitution

density = 400/100 = 4 g/cm³

4 0

3 years ago

The half life for the decay of carbon-14 is 5.73 x 10 years. Suppose the activity due to the radioactive decay of the carbon-14

Elena-2011 [213]

Answer:

Age of the atifact is $4.2\times 10^{2}$ years

Explanation:

For first -order radioactive decay- $A_{t}=A_{0}(\frac{1}{2})^{\frac{t}{t_{\frac{1}{2}}}}$
$A_{t}$ represents activity of radioactive nuclide after t time, $A_{0}$ represents initial activity of radioactive nuclide and $t_{\frac{1}{2}}$ represents half-life
Here, $A_{t}=19Bq$ , $A_{0}=20Bq$ and $t_{\frac{1}{2}}=5.73\times 10^{3}years$

Plug-in all the given values in the above equation-

$19=20\times (\frac{1}{2})^{\frac{t}{5.73\times 10^{3}}}$

or, $t=4.2\times 10^{2}$

So, age of the atifact is $4.2\times 10^{2}$ years

6 0

3 years ago

Libby is doing experiments with two different magnets. Magnet A can only attract thumbtacks that are up to 1 inch away from it.

castortr0y [4]

magnet B has a greater magnetic pull than magnet A

6 0

3 years ago

A scientific law is like a societal law because

natita [175]

A scientific law is like a societal law because they both are to be abided by their purposed way of doing things

3 0

3 years ago

Which of the following is a compound?<br> A. Zinc <br> B. S8 <br> C. CaCl2

sertanlavr [38]

C. Calcium is your best bet. Calcium chloride is amongst inorganic compounds.

3 0

2 years ago