All substances have characteristic properties. If one of these properties can be observed without changing the identity of the

substance, it must be a

If a 0.10 M solution of a colored substance has a maximum absorbance at 500 nm and an absorbance of 0.26 M at this wavelength, what will be the measured absorbance of a 0.20 M solution at 500 nm?

Which of the following is a physical change

Which of the following questions can be answered by science? A. Is fruit ripening dependent on the type of light the fruit is exposed to? B. Is it justifiable to add chemicals to the atmosphere to stimulate rain? C.

Predict what the Co, levels will be when you are "old". How many plants/trees need to be planted now to keep carbon dioxide in the atmosphere at its current level or lower?

What type of bond is most likely to be formed between two fluorine atoms? An ionic bond a nonpolar covalent bond a polar covalent bond a hydrogen bond

How many moles of carbon are in 7.87x10^7 carbon molecules?

The phases of the moon are caused by the changing positions of the Earth and the Moon in relation to the Sun. Which items could best be used to represent the Sun, the Earth, and the Moon in a model that shows the phases of the Moon? A.

Describe your observations of the original solutions. Describe your observations when the silver nitrate was added to the sodium chloride solution.

A gas occupies 18.5L at stp. what volume will it occupy at 735 torr and 57°c?

When two elements form two different compounds, the masses of element B that combine with 1 g of element A can be expressed as a ratio of small whole numbers.