Moles/Stoich
3 O2 + 4 Fe ----> 2 Fe2O3
How many moles of oxygen O2 does it take to react with 6.2 moles of Iron (Fe)?
It takes 4.65 moles of oxygen to react with 6.2 moles of Iron (Fe).
List three actions that can increase the rate of solution of a solute in a solvent.
1. Crushing
2. Stirring/Agitation
3. Temperature
If the pH is less than 7 and has a sour taste, reacts with a metal to form hydrogen gas, and turns blue litmus indicator paper red, is it an acid or a base?
It is an Acid.
In a endothermic reaction, is energy absorbed or released?
In an endothermic reaction, energy is absorbed.
Endothermic reactions require an input of energy to proceed, resulting in the absorption of energy from the surroundings. This absorbed energy is typically in the form of heat, causing the surroundings to cool down.
Therefore, in an endothermic reaction, energy is absorbed from the surroundings.
As the temperature of a gas increases, the pressure will ____.
Increase
How many atoms are in 2.5 moles of sodium (Na)?
There are 1.51 x 1024 atoms of sodium (Na) in 2.5 moles of sodium (Na).
Which of the following is an electrolyte?
H2O
CH3COOH
KOH
CH4
An electrolyte is a substance that conducts electricity when dissolved in water.
Among the options provided:
Therefore, the electrolyte among the options provided is:
KOH (potassium hydroxide), it is an ionic compound.
The fundamental concept of this theory is that an acid is defined as being able to lose, or "donate" a proton (the hydrogen cation, or H+) while a base is defined as a species with the ability to gain, or "accept," a proton. What theory is this?
This is the the Brønsted-Lowry theory of acids and bases.
According to the Brønsted-Lowry theory, an acid is a proton donor, and a base is a proton acceptor. This theory provides a broader and more inclusive definition of acids and bases compared to the Arrhenius theory, which is limited to substances that produce H⁺ or OH⁻ ions in water.
The phase change from gas to liquid is called?
Condensation
If 5.00 L of a gas is collected at 100 K and then allowed to expand to 20.0 L. What is the new temperature in order to maintain the same pressure?
The new temperature needed to maintain the same pressure when the gas expands from 5.00 L to 20.0 L is 400 K.
Convert 9 grams of SiO2 into moles.
The answer 0.18 moles of SiO2.
What effect would an increase in pressure have on the solubility of a solid in a liquid?
No effect.
An increase in pressure can increase solubility, solids are not very affected by changes in pressure. The solubility of most solids in liquids is primarily determined by factors such as temperature and the nature of the solute and solvent, rather than pressure.
Therefore, in general, an increase in pressure would not significantly impact the solubility of a solid in a liquid.
If the the substance has a -pH > 7, with a bitter taste, a slippery feel, and turns red litmus indicator paper blue, is it an Acid or Base?
It is a Base.
The Collision Theory states....
The Collision Theory states that for a chemical reaction to occur, the reacting particles (atoms, ions, or molecules) must collide with each other.
It emphasizes the following key points:
Collision Frequency: The rate of reaction is proportional to the number of collisions between reactant molecules per unit time.
Collision Energy: For a reaction to occur, the colliding particles must possess a minimum amount of energy called the activation energy. This energy is necessary to overcome the energy barrier and initiate the reaction.
Correct Orientation: Not only must the particles collide with sufficient energy, but they must also collide in the correct orientation for the reaction to proceed.
Overall, the Collision Theory helps explain the factors that influence the rate of a chemical reaction and why some reactions occur while others do not based on the concepts of collision frequency, collision energy, and correct particle orientation.
Volume is inversely proportional to _______________.
Pressure
How many atoms would 3.5 grams of Gold (Au) contain?
3.5 grams of Gold (Au) would contain 1.07 x 1022 atoms of Gold (Au).
What is the molarity of 5.30 grams of Na2CO3 dissolved in 400 mL of solution?
The molarity of 5.30 grams of Na2CO3 dissolved in 400 mL of solution is: M=0.125
What products are produced when an acid and base are mixed together?
Salt & Water
When an acid and a base are mixed together, they undergo a chemical reaction known as a neutralization reaction. In this reaction, the acid and base react to form water and a salt.
How many Joules of heat are required to heat 75 g of water from 85 oC to 185 oC?
31,000 J
How many moles of gas would you have if you had a volume of 38.0 L under a pressure of 1432 mmHg at 273 K ?
Therefore, you would have approximately 3.19 moles of gas in a volume of 38.0 L under a pressure of 1432 mmHg at 273 K.
To calculate the number of moles of gas, we can use the ideal gas law equation:
[ PV = nRT ]
where:
Given:
First, convert the pressure from mmHg to atm.
Now we can substitute the values into the ideal gas law equation to solve for ( n ).
2 Ga2O3 ---> 4 Ga + 3 O2
How many grams of O2 can be produced from 15.2 grams of gallium oxide (Ga2O3)?
3.98 grams of O2 can be produced from 15.2 grams of gallium oxide (Ga2O3).
Calculate the number of moles in a NaCl solution having a molarity of 0.95M and 2300 mL?
The number of moles in a NaCl solution having a molarity of 0.95M and 2300 mL is : 2.19 mols.
What would be the conjugate base of the acid HCO3?
CO3
The conjugate base of an acid is formed when the acid donates a proton (H⁺). In the case of the acid HCO3⁻ (bicarbonate ion), when it donates a proton, it forms its conjugate base.
What is the mass of a sample of aluminum that absorbs 1500 J of heat when heating from 55.0 oC to 100.0 oC (Aluminum: C= 0.89 J/g oC)?
37 grams
A balloon has a volume of 1.5 L at a temperature of 298 K. If you take it outside to -15°C, what is the volume?
The volume of the balloon when taken outside to -15°C will remain 1.5 liters. 1.3 L