Elephant’s Toothpaste
Do you know anything about chemical reactions? In this demonstration you will learn about chemistry. I did elephant’s toothpaste for my science project this year. I hope you learn from this project. Here’s how you do elephant’s toothpaste at home. You will need one regular water bottle, half a cup of twenty volume hydrogen peroxide, one tablespoon dry yeast, three tablespoons of warm water, eight drops of your favorite food coloring, a small cup, and a funnel. Pour your hydrogen peroxide into the water bottle. Add the dishwashing soap. Swish the soap and hydrogen peroxide around in the bottle. Now add eight drops of your favorite food coloring. In your cup, mix your warm water and yeast together to a mixture.
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The bonds between atoms are broken and new molecules are created. You start with one molecule and it turns into another. Chemical bonds are either made or broken in order to create a new molecule. If ice melts, it is a physical change. The molecules stay the same. But, when you bleach a shirt, the bleach breaks down the stain. The molecules are changed. This could include atoms, ions, compounds, or molecules of a single element. Chemical reactions can happen with anything, as long as chemical change occurs. For example, you put hydrogen gas and oxygen into a room. A little water might come out of it. But if you add a spark, an exothermic reaction explosion might occur. Single reactions often occur as a small part in a big reaction.
Exothermic Reactions
When chemical reactions happen, energy is taken or given to its surrounding environment. This happens a lot with a temperature change. This can be seen using a thermometer. Some examples of exothermic reactions are burning, rusting, and neutralization (reactions between acids and alkalis). Exothermic reactions can be used in everyday life. Some examples are hand warmers and self heating cans. Another example of an exothermic reaction is a flame. As it burns, it transfers heat to its surroundings.
Catalysts and
This reaction does not cause a rise in temperature. One other source is triboluminescence which is light produced from friction. Another source is electric discharge which is light produced when an electrical current passes through air or another, like neon, that produces a glow. Another source is light-emitting diode which is light produced when an electrical current passes through a semi-conductor which controls how well is conducts electricity.
coupling- When endergonic reactions utilize the energy that was released from an exergonic reaction. 17. energy of activation-The amount of energy that is needed in order for a reaction to start. 18. entropy-
A reactant is the substance that is used up in a chemical reaction to give product, which is the substance that is made at the end of the reaction. Besides, the energy of the molecules that determines how fast molecules are moving is known as temperature. Therefore, the rate of the reaction that happens between molecules is affected by the size of the reactant.
Endothermic reactions absorb energy while exothermic reactions release it. 2.3 How is matter classified? pure substance - matter composed of only one kind of atom or molecule mixture - a collection or two of more pure substances physically mixed together homogeneous mixture - a mixture containing substances that are uniformly distributed heterogeneous mixture - a mixture containing substances that are not evenly distributed phase - any part of a system that has uniform composition and properties elements - the 109 simplest substances from which more complex materials are
The Angus Mammoth Holen, Steven R., David W. May, and Shannon A. Mahan. 2011 “The Angus Mammoth: A Decades-Old Scientific Controversy Resolved”. American Antiquity 76.3: 487–499. Back in 1931, a mammoth fossil was found by a 15 year old named Earl Brooks in Nuckolls County, Nebraska. An expert was called in from the Hastings museum and he instantly identified the bones as mammoth and started excavating the skeleton.
Being, if hot and cold water were combined, then the cold water would move beneath the hot water because cold water is denser than hot water. Methods Materials: - Small glass bowl - Ice - Cold water - Food coloring - Spoon - Clear glass cup - Hot water - Clear medicine dropper Procedure: 1. First, in the glass bowl, mix the ice, cold water, and food coloring with the spoon 2. Next, fill the glass cup with hot water 3.
Introduction During this lab, students observed that not all substances dissolve at the same rate. Many factors involved including the independent and dependent variables affect how distinct substances dissolve. Overall, the chemical reaction, “the amount of reactant that changes the product in a given time”, played an important part in this experiment, when proven how a substance can change into another element by either emitting or absorbing energy. (Tro, 2018).
How does the amount of baking soda mixed with vinegar affect the volume of gas produced per 10 seconds? A reaction is when (usually) a solute acts on a solvent to create a reaction. An example of a reaction is an explosion, Here we will be using baking soda and vinegar which are our two components which will cause for a reaction to take place. Reactions can be affected by several things such as temperature, concentration and the presence or absence of a catalyst which is a substance which can increase the rate of reaction.
Many people do not realize that chemistry is a part of our day to day lives. One specific thing we see on a daily basis is the colors and paint people use in paintings, on buildings, and any other place paint could be. When this paint is developed, the people who make it have to decide exactly what the compound should be made up of. This is an important thing to consider when making these paints because as discussed in Chemistry 101 lab, compounds are different things that develop one item, in this case it is paint. They have to make sure that the paint is homogenous because if it was heterogeneous when being applied, the paint would not go on well.
Introduction: The purpose of this experiment is to demonstrate the different types of chemical reactions, those including Copper. There are different types of chemical reactions. A double displacement reaction is a chemical process involving the exchange of bonds between two reacting chemical species. A a decomposition reaction is the separation of a chemical compound into elements or simpler compounds and the single-displacement reaction is a type of
He gives an example of this by saying that if you were to heat up a
Reactions in the human body produce hydrogen peroxide as a product (1). Since hydrogen peroxide is poisonous to the human body, catalase catalyzes hydrogen peroxide into water and oxygen (2 H2O2 → 2 H2O + O2) (1). According to the collision theory, a reaction can only occur if particles collide with sufficient energy to overcome the activation energy and with correct geometrical orientation (3). Increasing temperature increases the kinetic energy of the particles which means that an increase in temperature will increase the speed of the hydrogen peroxide and the catalase molecules which
The change in thermal energy of a substance means a change in its temperature. Hot substances have high thermal energy while cold substances have low thermal energy. You can actually see this in water. Let’s say you are making spaghetti. You fill the pot with cool water and set it on the stove, the water is not really
It is a subcategory of the standard enthalpy of reaction and defined as the energy released with the formation of 1 mole of water (Enthalpy of neutralization, 2018). Standard enthalpy of reaction is the enthalpy change that occurs in a system when matter is transformed by a chemical reaction. All products and reactants must be in their standard state (Standard enthalpy of reaction, 2017). The standard enthalpy change can be found by dividing the heat released during the reaction by the number of moles involved in the reaction (Enthalpy of neutralization,
Want a sparkly smile for New Year 's Eve??? by Dr. Anuradha Kulkarni if you are contemplating to get your teeth bleached but are confused,then read the following article and make an informed decision. Introduction:Bleaching or whitening of teeth is one of the commonly sought aesthetic dental treatments. Bleaching will lighten the natural colour of teeth and gives a bright, attractive smile.