Q:

How long does it take for an apple to turn brown?

A:

Depending on the type of apple, it can turn brown almost instantly after being cut or take up to several hours. The oxidation process causes the apple to turn brown; oxygen present in the air reacts with the enzymes on the flesh of the apple.

Know More

Full Answer

Cooking apples, adding preservatives, minimizing the oxygen present and reducing the pH on the surface of the apples are all viable ways to stop or greatly reduce the speed of the oxidation process. Squeezing lemon juice onto freshly cut apples is an easy way to lower the pH and preserve the color of apples for up to 24 hours.

Learn more in Fruit
Sources:

Related Questions

  • Q:

    How long does it take for water to freeze?

    A:

    The time it takes for water to freeze varies from several hours to a month, depending on the volume of water, its temperature and the temperature of the surrounding air. Water freezes when it reaches 32 degrees Fahrenheit, but the time it takes for liquid particles to reach that point differs. Large lakes and deep ponds, for instance, may take several weeks to reach a freezing point and turn to solids, while a glass filled with water may freeze overnight if left outside.

    Full Answer >
    Filed Under:
  • Q:

    How long does it take for rigor mortis to set in?

    A:

    About.com Chemistry states that rigor mortis can take anywhere between 10 minutes to several hours to set in. Rigor mortis is the time after death when a body begins to stiffen, and the joints lock into place.

    Full Answer >
    Filed Under:
  • Q:

    How long does it take to freeze a gallon of water?

    A:

    The time it takes to freeze a gallon of water varies from minutes to several hours. The time it takes is based on several factors including temperature and the pureness of the water.

    Full Answer >
    Filed Under:
  • Q:

    How do you turn off Apple TV?

    A:

    To turn off Apple TV, use the remote control system that comes with the Apple TV or the in-built Remote app. Select Menu on the remote control system or Remote app, then Settings, and click the Sleep Now button. This process takes less than one minute.

    Full Answer >
    Filed Under:

Explore