biologia: mass and volume coins virtual lab report

Physical and chemical properties and mass, volume and density of coins virtual lab activity.

Valentina molina biology, 7A.

Vermont school Medellín.

Physical and chemical properties and mass, volume and density of coins virtual lab activity.

Vermont School Medellín.

Science

7a.

Valentina molina

paula castellanos and mikayla van den brenk

Medellín, Antioquia

February, 2013.

Introduction: in This lab report I am going to talk bout things from a virtual lab activity of finding the mass and volume of two coins for later find the density. The mass and the volume are characteristics of many things around the world; the physical reactions are reversible, chemical change make new substance or material irreversible, it can’t be again the material it was before.

Theoretical Background:

The density is property that the matter has; it is practically mass over volume or mass/volume, on this lab report of the density of two coins (coin A and coin B) the goal is to find which coin has more density and to use correctly the procedure of finding density.

It is a characteristic of a substance that doesn’t involve a chemical change such as density, color or hardness, is a change of matter that is not chemical.

Ex: Folding paper, cutting paper, wrinkled paper, breaking a chalk, cutting wood.

Distillation: Is a method for separating mixtures. Ex: Water cycle, evaporation and the condensation and is water again.

Evaporation: Is the process when a liquid heat so much and turns into a gas.

Ex: Water cycle, the sun heat the water and it turns into water vapor.

Filtration: Is about a flow of water and a granular bed or other solid, and separating them.

Ex: Purifying water that the water crosses by a place where the solid get stuck.

Decantation: Is a process like filtration but with a heavier solid.

Chemical property is a property of matter that describes a substance's ability to participate in chemical reactions. A chemical reaction is a reaction in which one or more substances are converted into different substances. The reactants are the starting materials in a chemical reaction. The products are the substances that are formed by a chemical reaction.

A chemical change is a change that occurs when one or more substances change into entirely new substances with different properties.

Some examples of chemical properties are:

Burning: Make by flames or intense heat.

Electrolysis: is the process by which ionic substances are decomposed (broken down) into simpler substances when an electric current is passed through them.

Neutralization: “A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of (H+) ions and OH-) ions to form water. The neutralization of a strong acid and strong base has a pH equal to 7.

Another lab activity with coins a, b and c is to use a brush and some substances for see the reactions and see which is the normal coin. The other coins can have different physical and chemical reactions.

Medical use: The kidneys use the filtration process for purify the blood when they need help, the digestive system also, it take the nutrients, the vitamins, and the other important things and threw away the wastes. These are ways the organism uses physical and chemical changes for stay healthy.

Other chemical change is to make the pills and medicines, the ingredients become only one.

Industrial uses: For purify the water for bottles and the food like fruits and vegetables, many chemical changes happen on many places on normal life like building houses, cars, baking bread or other food, and physical changes also like painting a house or fixing something.

1. Objectives

a) Learn how find density.

b) Discover the coin with more density.

c) Find correctly the mass and the volume.

d) Learn the physical changes and the chemical changers.

2. Materials and Reactives

Materials.	Reactives.
Laptop.	Water.
Calculator.	Substances.
Coins.
Balance.
Graduate.
http://my.hrw.com/sh2/sh07_10/student/flash/virtual_investigations/hst/mat/hst_mat_vi.html

Brush.

3. Procedure

1. Click on the coin A and put it on the balance for finds its mass.

2. Copy the mass.

3. Measure the water level on the graduate.

4. Then put coin A and copy he last volume.

5. Do the same with coin B.

6. Make the procedure of density.

4. Observations and Results.

1. Coin A is heavier than coin B, it has more volume and also density.

2. Coin a: Mass: 26.7. Volume: 2.6. Density: 10.26.

3. Coin b: Mass: 26.3. Volume: 2.8. Density: 9.392.

PHYSICAL & CHEMICAL PROPERTIES

TEST TUBE	SUBSTANCE	REACTIVE	OBSERVATIONS
1	CuS04	HCL []	YELLOWGREEN, COLD
2	CuS04	Na0H	CLEARBLUE, COLD
3	CuS04 2	NH3	LIGHT BLUE, NORMAL
1	Zn	HCL []	WARM, BUBBLES
2	Zn	Na0H	GREY, COLD
3	Zn	NH3	GREY, COLD