How do the properties of elements change as you move across a period

Which choice is an example of a decomposer? Question 8 options: tree sun fungi bat

What happens to the chemical energy in fireworks as they explode

How many Hydrogen atoms are in 3HCl

Sample A consists of calcium pellets. sample B consists of powdered calcium. which properties are the same for both samples A and B

If you were to pour 4 different liquids into a glass and the liquids separated into 4 layers, which liquid would have the highest density? A. the layer at the top of the glass B. the third layer from the bottom of the glass C.

The properties of elements are arranged by ... A. mass numbers B. atomic masses C. atomic radii D. atomic numbers

When a tire is inflated with air is it a chemical or physical change?

Which isotope is used to date ancient artifacts such as fossils? carbon-12 carbon-14 uranium-238 oxygen-16

If 8.60 grams of methane gas (hint: remember the fuel for the bunsen burner) is in a 2.00 L container at 66oC, what is the pressure in the container?

Insulator in a sentence, with science.