Question

how do you convert 0.4 ml to l? move the decimal 2 places to the left. move the decimal 3 places to the left. move the decimal 3 places to the right. move the decimal 2 places to the right. 13 multiple choice 1 point which of these is a compound? food coloring and water ch4 sand and water iron 14 multiple choice 1 point which of these is a compound? carbon dioxide salsa iron food coloring and water

Explanation:

Step1: Recall volume - unit conversion

We know that 1 L = 1000 mL, so 1 mL=$\frac{1}{1000}$L = 0.001 L.

Step2: Convert 0.4 mL to L

To convert 0.4 mL to L, we multiply 0.4 by the conversion factor 0.001. So 0.4 mL=0.4×0.001 L = 0.0004 L. This is equivalent to moving the decimal 3 places to the left.

Step3: Define a compound

A compound is a pure - substance made up of two or more different elements chemically combined in a fixed ratio.

Step4: Analyze each option for the first 'compound' question

• Food coloring and water is a mixture.
• $CH_4$ (methane) is a compound made up of carbon and hydrogen.
• Sand and water is a mixture.
• Iron is an element.

Step5: Analyze each option for the second 'compound' question

• Carbon dioxide ($CO_2$) is a compound made up of carbon and oxygen.
• Salsa is a mixture.
• Iron is an element.
• Food coloring and water is a mixture.

Answer:

1. B. Move the decimal 3 places to the left.
2. B. $CH_4$
3. A. carbon dioxide