Convert the following volumes from cubic centimeters to liters: 3500 cm3, 4000 cm3, 15000 cm3, and 1000 cm3.

Here are the conversions from cubic centimeters to liters:

The conversion factor is $1 \text{ L} = 1000 \text{ cm}^3$. To convert from $\text{cm}^3$ to liters, divide by 1000.

1. Convert $3500 \text{ cm}^3$ to liters.

$$3500 \text{ cm}^3 \times \frac{1 \text{ L}}{1000 \text{ cm}^3} = \frac{3500}{1000} \text{ L} = 3.5 \text{ L}$$

The converted value is $\boxed{\text{3.5 L}}$.

2. Convert $4000 \text{ cm}^3$ to liters.

$$4000 \text{ cm}^3 \times \frac{1 \text{ L}}{1000 \text{ cm}^3} = \frac{4000}{1000} \text{ L} = 4 \text{ L}$$

The converted value is $\boxed{\text{4 L}}$.

3. Convert $15000 \text{ cm}^3$ to liters.

$$15000 \text{ cm}^3 \times \frac{1 \text{ L}}{1000 \text{ cm}^3} = \frac{15000}{1000} \text{ L} = 15 \text{ L}$$

The converted value is $\boxed{\text{15 L}}$.

4. Convert $1000 \text{ cm}^3$ to liters.

$$1000 \text{ cm}^3 \times \frac{1 \text{ L}}{1000 \text{ cm}^3} = \frac{1000}{1000} \text{ L} = 1 \text{ L}$$

The converted value is $\boxed{\text{1 L}}$.