A hydrogen-filled balloon was ignited and 2.10 g of hydrogen reacted with 16.8 g of oxygen. How many grams of water vapor were formed? (Assume that water vapor is the only product.)


Answer 1
Answer: Hydrogen + oxygen --> water
2,1g + 16,8g = x
x = 18,9g

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1. What will happen if a car experiences a 300 N force to the right from the engine and a separate 150 N force due to friction and air resistance to the left? Show your work to support your position.



Force acting on the car moving it to the right = F1= 300 N

Force due to friction and air resistance moving it to the left = F2 = 150 N

To determine:

The net force on the car


Force is a vector. The force of friction acts in a direction opposite to the applied force.

If, F1 = 300N, right, then F2 = -150 N, left

Therefore, the net force acting on the car will be:

F = F1+F2 = 300 - 150 = 150 N

Ans: Since the force acting on the right is greater, the car will experience a net force of 150 N which will accelerate it to the right


What is the ph of a solution with a hydroxyl ion (oh-) concentration of 10-10 m? what is the ph of a solution with a hydroxyl ion (oh-) concentration of 10-10 m? ph 10 ph 12 ph 4 ph 2?


The pH in chemistry has been defined as the "power of hydrogen" that specifies and estimates the acidity and basicity. The pH of the solution with a hydroxyl concentration of 10⁻¹⁰ is 4. Thus, option c is correct.

What is pH?

pH has been defined as the  "potential of hydrogen" that is used to define the specificity of the acid and alkaline behavior of the solution. It has been the measure of the hydrogen or the hydroxide ions concentration dissociated into the solution.

pH is calculated as:

pH = −log ([H⁺])


Hydroxide ion concentration = 10⁻¹⁰

The relation between pH and pOH is given as:

pOH = - log [OH⁻]

pH = 14 - pOH

pOH is calculated as:

pOH = - log [OH⁻]

pOH = - log [10⁻¹⁰]

pOH = 10

Substituting values in the formula for pH as:

pH = 14 - pOH

pH = 14 -10

= 4

Therefore, option c. the pH is 4.

Learn more about pH, here:


According to this formula:
pH = - log [H]
And, pOH = - log [OH] >>> (1)
Where, pH + pOH = 14  >>> (2)
∵ the hydroxide ion concentration = (OH-) = 10 ^ -10 M
from (1) and (2) and by substitution: 
∴ pOH = - log [10^-10] = 10 
∴ pH = 14 - 10 = 4 

Which of the following chemical symbols represents the element sodium? a. s
b. n
c. sc
d. na


By refering to the Periodic Table of Elements, the answer would be Na, D.
Na represents the element sodium.

I’m a junior in an honors chemistry class and I really need an idea for science fair. Any recommendations that are level appropriate but not too difficult?


I did growing crystals easy and cool at the end
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