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Powdered and granulated sugar are both mostly sucrose, but a cup of powdered sugar contains much less mass—about 120 g versus roughly 200 g for granulated. Powdered sugar also usually contains starch, so it is not a simple cup-for-cup replacement.
Granulated sugar is far more concentrated by weight: nearly 100 g sugar per 100 g versus roughly 60–67 g in pure maple syrup. A tablespoon tells a different story because the syrup serving weighs more.
Brown sugar is not a nutritionally different category of sweetener. Molasses changes flavor and moisture and adds trace minerals, but a teaspoon of white or brown sugar still provides about 4 grams of sugar and roughly 16 calories.
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.