Types Of Water Resistant Sunscreen Essay

The independent variable was the amount of motor oil in 2% salt solution because it is the variable that was being tested and purposefully manipulated. The dependent variable was the hatching viability of the brine shrimp tested (which was calculated by adding the number of brine shrimp swimming at 24 hours to the number of brine shrimp swimming at 48 hours, and then divided by the total number of eggs initially placed in the petri dish). The control group was a petri dish of brine shrimp in 30 ml of 2% salt solution with no motor oil. The constants, or variables that need to be controlled, were the salinity percentage of the salt solution (2%), the amount of salt solution in each petri dish (30 ml), the total time the brine shrimp were left in the petri dishes (48 hours), and the frequency of when the brine shrimp were checked (every 24 hours).

The Dependent variable for this study is the amount of water absorbed by the paper towels. This will be measured in milliliters. The independent variable for this study is different brands of paper towels. The controlled variables will be the amount of water the paper towels are given to absorb, the size of the paper towels at the beginning of the experiment, and using the same measuring instruments in each trial. I will reduce the threat to internal validity by conducting the experiments in the

The only dependent variable is the time the ice cubes take to melt. The controlled variables are the size of the ice cube, and the room conditions they melted in. Aim: To see which type of ice cube melts faster (the one with or without sugar).

There are several parts to the experiment such as both the independent and dependent variables. The independent variable is controlled or changed during the experiment to test the effects on the dependent variable. The dependent variable is tested and measured during the test .A controlled variable is an example for an independent variable would be variable that is held constant throughout the experiment. An example is a theory that could extend a person’s life expectancy. The independent variable is the amount of vitamin given to the subject within the experiment. The dependent variable is the life span

1. For this experiment, what were the independent variable and the dependent variable? What were the constants?

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.

In our Penny Lab, we wanted to extend what we were told to do with experimental design. We’re doing this because we wanted to prove what he thought our hypothesis had been, and a hypothesis can not be true unless it can be tested. We investigated what variables made the Penny Lab easier, or harder. As a class we decided to investigate variables like, dropping the penny from the same height, and applying the same pressure to the penny for each drop. But first we had to know what variables were, and which variables we needed to use in the experiment. The variables were, the independent variable, dependent variable, the experimental group, and the control group. We investigated this to show how much water a penny could hold, but we introduced

4. The Independent variable is the dissolved oxygen and the dependent variable is the number of fish observed.

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.

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:

Dependent variable- jar volume after the egg is out (ml). Controlled variables- jar, same amount of water and corn syrup, same number of days it stayed there, same grade egg, same process, same surface we put them on. The experimental group are both the eggs because they both got tested on. We didn't have a control group because we didn't have an egg that didn't go through a test. The experimental group is the group you experiment on. The control group which doesn´t get tested

The independent variable of my experience meant is what I’m going to be changing which is the substance, coffee. The dependent variable of my experiment is the Daphnia’s heartbeat per minute, which will also increase immensely. The units I will be using to collect the data is one minute per trial.

Once my group gathered the equipment needed for our project, our variables were easy to form. Our control variable was how many Alka-Seltzer tablets were used per beaker. The independent variables

The scientific question of the project was, Does the size of a tire affect the bike’s speed? The hypothesis was , If the smaller tires were used, then the bike would go faster. The important procedures were: Make sure all equipment is ready. Test the standard wheel of 1 rotation or pedal a second to ride to the finish line. Test smaller and bigger wheels. Record data and have at least 3 trials. Record the data on a piece of paper and compare results to your hypothesis. The Independent variable is the size of the wheel on the bike. The Dependent variable is the standard wheel or tire on the bike. The control group was the bike’s speed and the standard wheel or tire. The Experimental group is the other tires or wheels being tested on the bike. The control variables were the rate of pedaling , the same bike model was used, and the same distance for

2. The independent variable is thewater. The dependent variable is the candy. The controlled variable are the other materials used.