How Does Clear Liquid Affect The Rate Of Evaporation Rates

In this case, it's how many drops I can get onto a penny without the water spilling off. Controlled Variables: These are things that I keep the same throughout all of the experiments to make sure that my results are actually due to the changes in the independent variable, not some other random change you made. I used the same penny and dropper. Procedure:

On average the Alka Seltzer tablet dissolved faster in hot water in comparison to ice cold water and room temperature water. The beaker with ice cold water caused the Alka Seltzer tablet to dissolve the slowest. The three beakers containing different temperatures of water, all produced carbon dioxide bubbles; however, the beaker containing hot water produced the bubbles more rapidly.

The purpose of this lab is to find if the mass changes when you galvanize and put a penny in the flame of a Bunsen burner introducing it to heat. In this lab, you galvanize eight pennies to silver and then heat up four of the silver pennies and make it into brass with the Bunsen burner. The independent variable in this lab is the penny because we have control over of what kind of penny we use rather it be new, old, dirty, or clean. The dependent variable in this lab is the mass of the penny because we are measuring the mass of each penny. Finally, the constant in this lab is the sodium hydroxide because; we use the same amount throughout the whole entire lab.

For our science project, we chose to do one that included luminol. Before we started, we found 3 cites, stating,” luminol will preform better in extreme heat than it does in room temperature or ice water.” Also one cite says,” It is used by crime scene investigators to discover spots of blood, even spots that may have been washed.” The last cite writes,” It was concluded that an inverse relationship exists between surface temperature and the reaction rate of the Luminol test.” Our question/ purpose was,” How does temperature affect luminol?” My hypothesis was that I thought that the warm water would affect the luminol more than the cold water.

The dependent variable in the experiment was the temperature and energy absorbed by the water.

Many factors effect reaction rates, two shown above include temperature and concentration. Concentration affects the rate of reactions because the more concentrated a solution the more likely collisions between particles will be. This is simply because there are more particles present to collide with each other. When the temperature is higher, particles will

A chemical change can be caused by combining two compounds, such as baking soda (NaHCO3) and vinegar (CH3COOH). The change that is taking place is because of the chemical property of reactivity. When these two compounds react CO2 is produced. In this experiment we wanted to see how much baking soda, added to 10mL of vinegar, would cause a film canister rocket to shoot the farthest. I predicted that 10mL of baking soda would shoot the farthest because it would be equal to the amount of vinegar in the canister. The independent variable in this experiment was the amount of baking soda and the dependent variable was how far the lid would shoot.

2A. Evaporation is related to the properties of matter because it is a liquid and a gas. We know this because there are three states of matter which are soild, liquid and gas since evaporation first starts as a liquid (water). Then it turns into gas (cloud).

The room temperature had little or no effect on the water potential. The mist increased the water potential of the air causing less transpiration to occur from the leaves.

1) What happens to the vapor pressure of water after the heat source is removed? What observation is proof of this? After the heat source was removed, the vapor pressure was decreased. This is proven by the boiling stopping.

Independent variable: We will change the amount of drops of Hydrochloric acid added to the Amylase. ( 5 drops, 10 drops, 15 drops)

The dependent variable in the experiment was the percent change in mass and the independent variable was the solution. This is a quantitative experiment because it was measuring the percent change in the mass of the potatoes.

The independent variable for the experiment was the paper towels. The dependent variable was the absorbency and strength. The constants for the experiment were the size of the paper towels that were used, the amount of water, the size of the beaker, the size of the cylinder and the amount of the weight.

The independent variable is sugar concentration. This will be changed by using solutions with different amounts of sugar (2%, 6%, 10%).

Variables: In this experiment, the temperature (in degrees Celsius) of the chemicals is the independent variable. To change the temperature, the materials are placed in a bath of water being heated by a hotplate.