Eventually, yes. It will also spoil if left inside the refrigerator, it just takes longer.
Most vinaigrettes are made of nothing more than vinegar, oil and some herbs, all of which are shelf stable. The vinegar will never go bad, but herbs can loose their potency and oil will eventually go rancid. The onset of rancidity and the potency of the herbs can be maintained by keeping it refrigerated and the container sealed.
Yes. It takes a long time for bacteria to form on this product. It will spoil if left out of the refrigerator. It will dry out if left uncovered.
yes because salad dressing is a suspension of vinegar that will separate into layers if left undisturbed.
Suspension
This can spoil if not kept in the refrigerator. Keep it in an airtight container to prevent drying out. It can last up to a week in the refrigerator.
Eventually bacteria will grow and cause it to spoil.
yes, ranch dressing is mainly oil, so it is very sensitive to lipid oxidation and will turn rancid if left out over night at room temperature
Most foods will eventually spoil when left in the open.
Oil and vinegar dressing is a temporary emulsion. When the dressing sits for a while the oil and vinegar separate from each other. If you were to put this on the salad it would taste pretty disgusting because it would be entirely oil. So to avoid this, you shake the dressing and then add it to the salad so that the oil and vinegar is combined and it creates a good flavour.
The question properly would be "How do apples spoil?" Eventually, they will turn brown or get brown spots on them if you leave them in the refrigerator too long... Try to use them before they begin getting brown spots. And frankly, you can still eat them and bake with them -- just cut away the brown spots. But I wouldn't ...
Meats are kept better in the freezer. Meats can be kept in the refrigerator for 3 to 4 days if raw and 1 to 2 days longer if cooked. Always place cooked meats in an airtight container.
Dried barley can be stored more or less indefinitely, either packaged or unpackaged, in the refrigerator or not. Cooked barley will last a number of days in the refrigerator, but if left out, will go moldy (it will go moldy in the refrigerator eventually also). Under certain conditions, it could also ferment, forming either alcohol or vinegar.
honey is only that does not spoil when left open