Describe why the substance iron sulphide can be classified as an element, compound or mixture.

Which way of moving molecules across a membrane requires energy?

We both have 10 neutrons in our nuclei. What are we?

How do isotopes of a given element differ? How am they similar?

which statement describes acids? A - Acids dissolve in water to produce a solution that tastes bitter. B-Acids dissolve in water to produce a solution that reacts with metals to produce H2 gas.

In a reaction of an acid with a base, the pH changes to a value that is closer to what?

When you measure something in meters cubed, you are measuring

Low density: low pressure: high density Is which. evaporation? water vapor? condensation / liquid water

Which structures are found on sponges? pores medusae polyps stinging cells

Coefficients in a chemical equation are used to: balance the number of atoms on both sides of the equation ensure that all subscripts on both sides of the equation are the same indicate energy changes that occur during the reaction indicate the type

What determines your blood cholesterol level?