What effect to calcium ions have on the water in ecosystems?

A. they add to its hardness

B. they increase its acidity

C. they reduce its pH

D. they decrease its salinity

What is the voltage if the current is 10 amps and the resistance is 2 volts? How do I solve this?

Cheng made a chart to categorize resources. Which correctly completes the chart? X: Geothermal energy Y: Nonrenewable X: Wind Y: Renewable X: Natural gas Y: Nonrenewable X: Plant fiber Y: Renewable

A reaction is non-spontaneous at any temperature when

Becomes caramel. He pushes astick into the bottom of the acole. Then he dipstip apple in the caramel Which of the following actions is achemical change? melting sugar in the pan turning sugar into caramel putting the stick into the apple

A measure of the internal energy that has been absorbed or transferred from one body to another is

Why is galvanized steel preferred for outdoor uses?

Which of the following factors renders a species more susceptible to disease and infertility?

What kind of intermolecular forces act between a hydrogen iodide molecule and a chlorine monofluoride molecule?

Nonpolar materials have separated positive and negative areas. True False

Name the 12 elements in the periodic table