A mixture of copper sulfate and water is heated, leaving a residue of copper sulfate in the container. Which method was used to separate the mixture?
Chromatography
Filtration ****
Distillation
Evaporation
2 What type of model best represents cyrstals?
ball-and-stick ****
space-fill
ribbon
Lewis dot
3. Which option describes the molecule geometry of a molecule with one bond and three lone pairs?
angled
tetrahedral ****
octahedral
linear
No #1 would be evaporation. Because you evaporated the water out.
I don't agree with your answer to #1. What did you filter?What do you separate in a filter?
To answer these questions, let's break them down one by one:
1. A mixture of copper sulfate and water is heated, leaving a residue of copper sulfate in the container. Which method was used to separate the mixture?
To determine which method was used to separate the mixture, we should first understand the properties of the components involved. In this case, we have copper sulfate, which is a solid, and water, which is a liquid.
Options like chromatography, distillation, and evaporation involve separating mixtures based on differences in physical properties, such as boiling point or solubility. However, since the residue of copper sulfate is left behind, it suggests that the process used was a method to separate solid particles from a liquid.
The correct answer is Filtration. Filtration involves passing the mixture through a filter medium or membrane that retains the solid particles while allowing the liquid to pass through. In this case, the mixture of copper sulfate and water was heated, and then the hot mixture was filtered to separate the solid copper sulfate residue from the liquid.
2. What type of model best represents crystals?
To determine the type of model that best represents crystals, we need to consider the visual representation of the crystal structure. Different models are used to depict various aspects of molecules and their arrangements in crystals.
The options provided are:
- Ball-and-stick
- Space-fill
- Ribbon
- Lewis dot
Among these options, ball-and-stick models are commonly used to represent crystals. Ball-and-stick models show atoms as balls and bonds as sticks, providing a clear visualization of the arrangement of atoms in a crystal lattice. This type of model is often used to depict the three-dimensional structure of molecules and their crystal forms.
So, the correct answer is Ball-and-stick.
3. Which option describes the molecule geometry of a molecule with one bond and three lone pairs?
To determine the molecule geometry of a molecule with one bond and three lone pairs, we first need to understand the concept of lone pairs. Lone pairs are electrons that are not involved in bonding but reside on an atom.
The options provided are:
- Angled
- Tetrahedral
- Octahedral
- Linear
In this case, a molecule with one bond and three lone pairs would have a central atom surrounded by three lone pairs and one bond. Taking into account the arrangement of electron pairs around the central atom, the correct answer is Tetrahedral.
In a tetrahedral geometry, the lone pairs and the bond are arranged in a way that resembles a tetrahedron (a pyramid with a triangular base). Therefore, the correct answer is Tetrahedral.