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3 years ago

Why is it important to have a controlled experiment

2 answers:

6 0

It is important to have a control group in your experiment so you are able to compare your actual results to the control group

Alexus [3.1K]3 years ago

3 0

By the end of the day you know how much each group ate, abd you compare it with the control.In convlution,control is important because without it you'd have no way to understand the results after and experiment happens.

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PLZ SOMEONE HELP THANKS:))))<br> materials and conclude which is best to use. Full explanation

grin007 [14]

Answer:

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2 years ago

KOH + H3 PO4+K3 PO4+H2O

lara [203]

Answer:

Explanation:

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2 years ago

How many atoms are in 4H3BO3

maksim [4K]

1 mole of h3bo3...........6.023*10²³ each h and B and 0 so we will have 3hydrogen+ 1 B+3 oxygen = 7*6.023*10²³ atoms

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2 years ago

What is the value of x in the measure of the angle?

Andrew [12]

The two angles would be both 41 degrees.
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x in this case would be 14 degrees.

4 0

2 years ago

Read 2 more answers

The British gold sovereign coin is an alloy of gold and copper having a total mass of 7.988 g, and is 22-karat gold.

azamat

Answer:

(a) $m_{gold}=7.322g$

(b)

$V_{gold}=0.379cm^3$

$V_{copper}=0.122cm^3$

Explanation:

Hello,

(a) In this case, with the given formula we easily compute the mass of gold contained in the sovereign as shown below:

$m_{gold}=\frac{m_{tota}*karats}{24}=\frac{7.988g*22}{24}=7.322g$

(b) Now, by knowing the density of gold and copper, 19.32 and 8.94 g/cm³ respectively, we compute each volume, by also knowing that the rest of the coin contains copper:

$V_{gold}=\frac{m_{gold}}{\rho_{gold}} =\frac{7.322g}{19.32g/cm^3}=0.379cm^3$

$m_{copper}=7.988g-7.322g=1.09g\\V_{copper}=\frac{m_{copper}}{\rho_{copper}}=\frac{1.09g}{8.94g/cm^3} \\\\V_{copper}=0.122cm^3$

$\rho _{coin}=\frac{m_{total}}{V_{gold}+V_{copper}}=\frac{7.988 g}{0.379cm^3+0.122cm^3}\\ \\\rho _{coin}=15.94g/cm^3$

Best regards.

3 0

2 years ago

Read 2 more answers