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3 years ago

ILL GIVE BRAINLEIST IF CORRECT:

Chemistry

2 answers:

Arte-miy333 [17]3 years ago

8 0

Answer:

Explanation:

When the strip of silver is heated, the silver particles move farther apart.

igomit [66]3 years ago

6 0

I also agree that it’s a, did this before

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Which of the following manifests the harmonious bringing forth of technology?

irinina [24]

Answer:

iPhones

Explanation:

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3 years ago

Which of the elements Magnesium, Calcium, Serum, Barium, looses electron readily

anzhelika [568]

Answer:

mg. ca . ba. loses very easily

Explanation:

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3 years ago

A 100 gram block is placed on a scale that is known to have a 12% error. What will the scale read?

sesenic [268]

The scale will read <u>112 grams.</u>

Why?

Since we already know the percent error of the scale (12%) and we also know the mass of the block that is placed on the scale, we can calculate what will be the read of the scale by using the following formula:

$ScaleRead=100g+(100g*\frac{12}{100})=100g+(100g*0.12)=100g+12g\\\\ScaleRead=112g$

We can see that the scale will read 112 grams.

Let's verify that we are right by using the following formula to verify if the obtained value for the scale read will be 12%:

$PercentError=\frac{ActualValue-RealValue}{RealValue}*100=\frac{112g-100g}{100g}*100\\\\PercentError=\frac{12g}{100g}*100=0.12*100=12(percent)$

Hence, we can see that the scale will read <u>112 grams.</u>

Have a nice day!

7 0

4 years ago

How can you make that the gas' molecules move faster?

Vladimir79 [104]

With an increase in temperature, the particles gain kinetic energy and move faster. (The ANSWER is increase the temperature.)

4 0

3 years ago

Read 2 more answers

From the mass of Al reacted, how many moles are present? What is the mole ratio between Al and H2 in the balanced chemical react

tigry1 [53]

Answer:

From the mass of Al reacted, how many moles are present? We don't have the mass of Al reacted

What is the mole ratio between Al and H2 in the balanced chemical reaction?

By stoichiometry, ratio between Al and H₂ is 3:2

What units are required on the temperature when doing calculations with gases? °K degrees

The value of R is 0.082 L.atm/mol.K

Explanation:

A chemical reaction for this can be this one:

2Al (s) + 6HCl (aq) → 2AlCl₃(aq) + 3H₂ (g)

Balanced

To get the moles which are present in the mass of Al reacted you must calculate:

Al Mass / Al molar mass = Al moles

The Ideal Gas equation is this one:

Pressure . Volume = n° moles . R (gases constant) . T°K

The temperature must be in K, because the units of R

We usually use R = 0.082 L.atm/mol.K

5 0

3 years ago