Question

there are a number of mixtures that are solid at room temperature. brass is a mixture of copper and zinc. soil (dirt) is also a solid mixture at room temperature. which is homogeneous, brass or soil? what test would you use to determine this? brass our lab examples - sugar cookies vs. chocolate chip cookies record them as homogenous or heterogeneous. be sure to record how you determined this (be specific). lab station 2. liquid mixtures salt water is a ________________ mixture that is liquid at room temperature. orange juice is a ________________ mixture. our lab examples - tomato soup vs. vegetable soup record which is homogenous or heterogeneous. be sure to

Explanation:

1. Brass is a homogeneous mixture. It has a uniform composition throughout as the copper and zinc are evenly mixed at a microscopic level. To test this, one could take multiple small samples from different parts of a brass object and analyze their composition (e.g., using spectroscopy) - they should be the same.
2. Soil is a heterogeneous mixture. It contains various components like sand, clay, organic matter, rocks etc. that are not uniformly distributed. One can visually observe different parts and textures in soil.
3. Sugar cookies are usually homogeneous as the ingredients are well - mixed and have a uniform texture throughout. One can break a sugar cookie and observe that it looks the same throughout.
4. Chocolate chip cookies are heterogeneous because the chocolate chips are distinct components within the cookie dough matrix. One can see and separate the chocolate chips from the cookie dough.
5. Salt water is a homogeneous liquid mixture as the salt is uniformly dissolved in water. One can take samples from different parts of a container of salt water and find the salt concentration to be the same.
6. Orange juice (without pulp) is a homogeneous mixture as the components are uniformly mixed. If there is pulp, it becomes heterogeneous. One can check for uniformity by observing if there are any distinct non - mixed parts. Tomato soup (smooth) is homogeneous while vegetable soup with visible chunks of vegetables is heterogeneous.

Answer:

1. Brass is homogeneous. Test: Analyze composition of multiple small samples from different parts using spectroscopy.
2. Soil is heterogeneous. Test: Visual observation of different parts and textures.
3. Sugar cookies are homogeneous. Test: Break and observe uniform texture.
4. Chocolate chip cookies are heterogeneous. Test: Visually identify and separate chocolate chips from dough.
5. Salt water is a homogeneous liquid mixture. Test: Check salt concentration in samples from different parts.
6. Orange juice (no pulp) is homogeneous, with pulp is heterogeneous. Test: Observe for non - mixed parts. Tomato soup (smooth) is homogeneous, vegetable soup with chunks is heterogeneous.