Question
1. Imagine that you are given a glass filled with ice cubes and water. Should the contents of the glass be considered a pure substance or a mixture? Explain your answer.Be sure to describe the differences and similarities between the ice and the water. (3 points) 2. Why do some beverages have, "SHAKE WELL BEFORE USING" written on the container. Describe particle size and use approprlate vocabulary. (3 points) 3. You have a mixture of salt, sand, pebbles,and wax beads. What is the best procedur for separating the objects?(3 points) 4. What is the fastest way to dissolve a sugar cube. Explain WHY?(3 points) 5. Draw and label the following particles: ATOM, MOLECULE, COMPOUND , ELEMENT, MIXTURE (3 points) EXTRA CREDIT 1. What is the 2-word term used for the scattering of light by a colloid or susper __ __ (1 pt) 2.If you mix 50 ml of water with 50 ml of ethyl alcohol you get a solution wi volume of 96ml. How is this possible? (2 pts) 3. MEME IT. (Up to 3 pts)
Solution
4.1
(164 Votos)
Bernardo
Mestre · Tutor por 5 anos
Resposta
1. The contents of the glass should be considered a mixture because the ice cubes and water are not chemically combined and can be separated by physical methods.2. Some beverages have "SHAKE WELL BEFORE USING" written on the container because the particles in the beverage are not uniformly distributed. Shaking the container helps to distribute the particles more evenly throughout the liquid.3. The best procedure to separate a mixture of salt, sand, pebbles, and wax beads would be to use a combination of sieving and magnetic separation.4. The fastest way to dissolve a sugar cube is to stir it in hot water because heat increases the kinetic energy of the water molecules, which in turn increases the rate of collision between the water molecules and the sugar molecules.5. An atom is the smallest unit of an element that retains the properties of that element. A molecule is a group of atoms bonded together. A compound is a molecule that contains at least two different elements. An element is a substance that cannot be broken down into simpler substances by chemical means. A mixture is a combination of two or more substances that are not chemically combined.Extra Credit:1. The 2-word term for the scattering of light by a colloid or suspension is Tyndall effect.2. When water and ethyl alcohol are mixed, they do not simply add up to 100ml because some of the water and alcohol molecules occupy the same space, leading to a lower total volume.
Explicação
## Step 1The first question asks whether the contents of a glass filled with ice cubes and water should be considered a pure substance or a mixture. A pure substance is a form of matter that has a constant chemical composition and specific properties. It cannot be separated into components by physical separation methods. On the other hand, a mixture is a combination of two or more substances that are not chemically combined and can be separated by physical methods. In this case, the glass contains ice cubes and water, which are not chemically combined and can be separated by physical methods. Therefore, the contents of the glass should be considered a mixture.## Step 2The second question asks why some beverages have "SHAKE WELL BEFORE USING" written on the container. This is because the particles in the beverage are not uniformly distributed. When the container is shaken, the particles are forced to move around, which helps to distribute them more evenly throughout the liquid. This process is known as agitation.## Step 3The third question asks for the best procedure to separate a mixture of salt, sand, pebbles, and wax beads. The best method would be to use a combination of sieving and magnetic separation. Sieving can separate the sand and pebbles based on their size, while magnetic separation can separate the wax beads.## Step 4The fourth question asks for the fastest way to dissolve a sugar cube. The fastest way to dissolve a sugar cube is to stir it in hot water. This is because heat increases the kinetic energy of the water molecules, which in turn increases the rate of collision between the water molecules and the sugar molecules. This increased collision rate speeds up the dissolution process.## Step 5The fifth question asks to draw and label the following particles: ATOM, MOLECULE, COMPOUND, ELEMENT, MIXTURE. An atom is the smallest unit of an element that retains the properties of that element. A molecule is a group of atoms bonded together. A compound is a molecule that contains at least two different elements. An element is a substance that cannot be broken down into simpler substances by chemical means. A mixture is a combination of two or more substances that are not chemically combined.## Step 6The extra credit questions ask for the 2-word term used for the scattering of light by a colloid or suspension, and why mixing 50ml of water with 50ml of ethyl alcohol results in a solution with a volume of 96ml. The 2-word term for the scattering of light by a colloid or suspension is Tyndall effect. When water and ethyl alcohol are mixed, they do not simply add up to 100ml because some of the water and alcohol molecules occupy the same space, leading to a lower total volume.