(5 points) 69.71 or 3.626x10^8 km2 I’m guessing I cannot figure it out for the life of me. 3. Identify the following changes as physical or chemical: (2 points each, 6 points total) a. A machine makes a nail from wire by stretching the wire, then cutting it at angles to form the point, and then flattening the other end to form a head. Physical b. Pulp-free orange juice is prepared by filtering most of the pulp from fresh orange juice.
Lab #5 Penny Sandwiches Exploration Step 1 Using the file or coarse sandpaper, completely remove the copper coating from the edge of both pennies. Pour the lemon juice into one container. Position one penny in the container so that it is standing on its edge against the side of the container. Pour the vinegar into the second container and similarly position the second penny. Observe the pennies for 4 or 5 minutes.
The air, the cake, and the pan are all at 450°F, but only the metal pan will burn your hand. Air has very low heat capacity and also low conductivity, so you can put your hand in the oven long enough to touch the cake and pan. The heat capacity of the cake is a lot higher than air, but since it has low conductivity you can briefly touch it without getting burned. The metal pan has a heat capacity similar to the cake, but high conductivity too. If you touch it, you will get burned.)
This causes it to reproduce blue colonies of bacteria. 5. We did not add plasmid to the control plate because it did not have any bacteria on it to cause a reaction. 6. We put the bacteria through a heat shock because that is how hot it would be in a human body, therefore, making it a natural
When using the 20% rule it works the same way. The can of Healthy Choice chicken noodle soup contains 25% of vitamin A. The daily value of vitamin A is an excellent source as it contains more then 20% of one’s daily value and it is a nutrient that is much needed. Now, when using the 5/20 rule for the nutrients that are not beneficial to our bodies, it is key to note the calorie serving size and percent daily value, which is listed in the top section of the nutrition label. The serving size indicates the amount that is good for 1 person as well as how many serving are in the container.
Place about one quarter of a ripe banana in a small resealable plastic bag. Seal the bag, and use your fingers to squash the banana until no visible chunks remain. 2. Use a graduated cylinder to measure 10 mL of the 0.9% NaCl solution, and add it to the bag. Mix thoroughly.
In the 1800s, the first solar water heaters on record were developed. At the time, there was no easy way to heat water so farmers, prospectors, and others devised a safe, easy, and inexpensive way to heat water. They simply painted the water tank black and placed it in the sun. This system worked, but ineffectively. It took most of the day to heat up the
Wilson English 101 (Extra Credit) How to Grow an Avocado Tree: Have you ever eaten an avocado and wished you could do something with the enormous seed? Well, you can; with a little luck and a little skill, you can grow an attractive house plant from it. Caring for an avocado is not complicated, provided you follow a few simple rules. Wash the seed in tepid water, removing all the pulp. Suspend the seed with the broad end pointing down in a water-filled glass or jar by driving three toothpicks into the sides for support.
Acids (low pH) range from one to six on the scale, while bases (high pH) range from eight to 14 on the scale. A pH of seven is considered neutral, like pure water. pH stands for "potential for hydrogen ion concentration" and refers to the amount of hydrogen ions in a solution. The more hydrogen ions, the lower the pH. The fewer hydrogen ions present, the higher the pH.
Those foods with lower water activities are quite shelf-stable in that they contain very little water available for microorganisms to use for growth. When microorganisms grow, they degrade the food causing spoilage as well as health dangers for the consumer. Although there can be a correlation between total moisture content of a food and the water activity, the correlation does not occur at all times. Food products can exist with high moisture content but have very little water activity. Many natural ingredients can be added to a product to “bind” the water making it unavailable for the growth microorganisms.