Answer:
Salt issolved in water: homogeneous mixture
muddy water : heterogeneous mixture
Sodium fluoride = compound
Silver = element
Explanation:
Step 1:
A heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture.
A homogeneous mixture is a mixture in which the composition is uniform throughout the mixture.
A chemical compound is a chemical substance consisting of two or more different chemically bonded chemical elements, with a fixed ratio determining the composition.
An element is a substance whose atoms all have the same number of protons: another way of saying this is that all of a particular element's atoms have the same atomic number. Elements cannot be broken down using chemical reactions.
Salt dissolved in water = Salt is soluble in water, which would give a homogeneous mixture
Muddy water = Muddy water, on the other hand is a heterogeneous mixture because mud can settle, leaving the mixture with much less mud at the top of the bucket than the bottom.
Sodium floride = a compound made of 2 elements: Sodium and fluoride
Silver = An element, it can be found on the period table.
Quantitative numerical data
The wood has undergone a chemical change and has been transfered into energy and gas. Also, the smoke coming from the fire comes from the wood
Answer:
The use of post-consumer polyolefins is increasing due to the pledges of multiple organizations to use higher concentrations of recycled materials in packaging. However, direct food contact applications are challenging with various regulations around the world mandating minimum safety requirements, which is often determined by the condition of use (microwave, cold storage) and food type (fatty, aqueous, dry). This article reviews different predictive models that have been developed to study contaminant migration from packaging to food contact articles. It also examines multiple techniques and methods that have been employed to quantify and assess to the safety of recycled materials (e.g., United States and Europe) which serve as a base for the regulatory framework for many other countries. The presence of different contaminants during polymer processing is also discussed due to potential problems from the presence of harmful compounds affecting human health or degradation of material properties.