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Old baking powder can look perfectly normal yet leave a cake flat. A hot-water test checks its remaining leavening power: strong immediate fizzing means it is still reactive; weak bubbling means it is time to replace it.
Old dry yeast is usually a performance problem rather than a spoilage problem: fewer cells remain active, so dough may rise slowly or not at all. A quick warm-water test can tell you whether it is still producing gas.
In the U.S., corn flour and cornmeal are both ground corn, but corn flour is much finer. Cornstarch is different again: it is isolated starch used mainly for thickening rather than for the grain texture of cornbread or polenta.
Cream of tartar is not creamy at all. It is potassium bitartrate, a dry acid that can stabilize whipped egg whites, supply the acid baking soda needs, and discourage large sugar crystals.
Almond flour brings fat and tenderness, while coconut flour is highly fibrous and unusually absorbent. They can both work in gluten-free baking, but using the same amount of each rarely gives the same dough or batter.
Cornstarch is roughly twice as powerful as all-purpose flour by volume for many sauces. It gives a glossy finish, while flour makes a more opaque, creamy sauce and works naturally in a roux.
Self-rising flour is a prepared flour with leavener already built in, while all-purpose flour lets the recipe control leavening and salt separately. They can sometimes substitute for each other, but not as a blind cup-for-cup exchange.
Cake flour is designed for tenderness. Its lower protein and fine texture reduce gluten-forming potential compared with all-purpose flour, helping delicate cakes bake with a finer, softer crumb. All-purpose flour can still make good cake, but the recipe and mixing method matter more.
Almond flour typically provides about 20–25 g of total carbohydrate per 100 g compared with roughly 75–77 g in refined wheat flour. It also contains much more fat and fiber, so it is not a lower-calorie or 1:1 baking substitute.
Bread flour is usually higher in protein than all-purpose flour, so it builds a stronger gluten network and often absorbs a little more water. All-purpose flour can still make excellent bread; the trade-off is usually a softer, less chewy structure rather than a failed loaf.
Both leaveners can create carbon dioxide, but they are designed for different chemical environments. Baking soda needs enough acid in the formula; baking powder carries its own acid system. Swapping them without reformulating can change rise, flavor, color, and texture.
Instant yeast usually starts a little faster because its smaller particles rehydrate quickly and can be mixed right into flour. Active dry yeast may take longer to get going, but major baking references allow a 1:1 substitution in most standard doughs.