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4 years ago

Why do scientists need scientific models?

Chemistry

2 answers:

zhuklara [117]4 years ago

7 0

So they can prove there hypothesis is correct or have an understanding.

Kazeer [188]4 years ago

6 0

Because sometimes the real thing is either too big or too small to observe or test, so they need an easily observable model.

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PLEASE HELP ME ASAP!!!!!! i hope you can see this!!! if you do this can you please show your work

STatiana [176]

Answer:

3.83%

Explanation:

First, find the average of the measured value. You should get 286.

291 + 287 + 295 + 281 = 1154

1154/4 = 288.5

Subtract the accepted value (300) from the average measured value (286). Take the absolute value of your answer. You should get 14.

288.5 - 300 = -11.5 = 11.5

Divide the difference from the above problem (14) by the accepted value (300). You should get 0.0467.

11.5/300 = 0.0383

Multiply by 100%.

0.0383 × 100% = 3.83%

The percent error is 3.83%.

7 0

3 years ago

Read 2 more answers

Calculate the number of mol of helium in a 2.01-L balloon at 29°C and 2.71 atm of pressure. Be sure to answer all parts. Imol

konstantin123 [22]

Answer:

0.220 mol He

Explanation:

Hello,

Based on the ideal gas equation of state:

$PV=nRT\\n=\frac{PV}{RT} \\n=\frac{2.71 atm * 2.01 L}{0.082\frac{atm*L}{mol*K}*302K } \\n=0.220 mol$

Best regards.

4 0

3 years ago

One gram of Sn was electroplated from a SnCl, solution in 30 minutes. What was the current used?

Andrews [41]

Answer:

0.903 A

Explanation:

We have given mass of Sn = 1 gram

Time t=30 minutes=30×60=1800 sec

According to Faraday law m=zit

Where z is electron chemical equivalent

z is calculated by $z=\frac{atomic\ mass}{nF}$ where n is number of element and F is Faraday constant

So $z=\frac{atomic\ mass}{nF}=\frac{118.71}{2\times 96500}=0.000615$

So $1=0.000615\times i\times 1800$

i =0.903 A

4 0

4 years ago

When the ionic compound ammonium chloride, NH 4 Cl, , dissolves in water, it breaks into one ammonium ion, NHt^ 1+ , one chlorid

Arada [10]

Answer:

0.400 moles

Explanation:

Well, you know that one mole of ammonium chloride,

NH 4 Cl , dissociates completely in aqueous solution to form one mole of ammonium cations,

NH + 4 , and one mole of chloride anions, Cl − .

3 0

3 years ago

Please help it’s due today I will give brainliest

Thepotemich [5.8K]

1st and 4th options are suitable answers, as these 2 changes are not exactly physical changes as it cant return back to original form and as well as its not cooling, so I feel its 1st and 4th options

7 0

3 years ago