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3 years ago

When does a idea become a theory

2 answers:

5 0

An Idea becomes a theory after multiple tests have been done on that thought and it has been approved by other scientists. Hope this helps! :)

Sonja [21]3 years ago

5 0

After it has been tested and approved by other researchers

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12. Draw an energy curve for a chemical reaction that begins at 30 kj and has an activation energy of

Rufina [12.5K]

Answer:

<em>Since the activation energy is $50kJ$ , we need to supply it $50kJ$ from $30kJ$ to make it $80kJ$ .</em>

Diagram attached in the file .

8 0

3 years ago

A student needs to prepare 100. mL of 0.612 M Cu(NO3)2 solution. What mass, in grams, of copper(II) nitrate should the student u

Temka [501]

Answer: 11.5 grams

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution

$Molarity=\frac{n\times 1000}{V_s}$

where,

Morality = 0.612 M

n= moles of solute

$V_s$ = volume of solution in ml = 100 ml

Now put all the given values in the formula of molarity, we get

$0.612=\frac{n\times 1000}{100ml}$

$n=0.0612moles$

$Mass={\text {moles of solute }}{\times {\text {molar mass}}=0.0612moles\times 187.56g/mol=11.5g$

Therefore, the mass of copper (II)nitrate required is 11.5 grams

3 0

3 years ago

Now liters at the same temperature and pressure: liters of H2 + liters of O2 → liters of H2O

iragen [17]

The answer is 2H2 + O2----> 2H2O

5 0

3 years ago

Mike, Jackie, Jeremy, and Niki were widely known to the be the fastest fifth graders at Robinson Elementary School. They wanted

riadik2000 [5.3K]

Jackie is the fastest student. (Option A)

Explanation:

From the table it was understood that their speeds are given in meter per second, that is how many meters they run in one second. It was again shown that Jackie's race speed is 5.3 meter per second and all the other three namely Jeremy's speed is 3.9 meter per second, Mike's speed is 4.1 meter per second and finally Niki's speed is 3.8 meter per second.
So, by comparing with others Jackie is the fastest runner in that race.

8 0

3 years ago

nadira is using her laptop for about 6 hours straight,yet her laptops barley hot or warm. Does her laptop have high or low speci

makkiz [27]

Her computer will start to heat up, and the temp. would be 60 degrees celcius.

I hope this helps you ᕕ( ᐛ )ᕗ

8 0

3 years ago