What trend in ionization energy occurs across a period on the periodic table? What causes this trend?

is aluminum foil a compound element or mixture?

Explain why atoms are neutral.

Is it possible to identify something as an element, compound or pure substance

Kara shines a blue light and a red light onto paper as shown in the figure below. If the paper is blue, what color (or colors) of light reflect off the paper? A. only blue B. only red C. both red and blue D. neither red nor blue

Use the Activity Series Chart Which of the metals (Fe, Zn, Mg) will react in an aqueous solution of Al (NO3) 3 to produce aluminum metal?

A compound contains 38.7% K, 13.9% N, and 47.4% O by mass. What is the empirical formula of the compound? A compound contains 38.7% K, 13.9% N, and 47.4% O by mass. What is the empirical formula of the compound?

A sample of an unknown compound was decomposed and found to be composed of 1.36 mol oxygen, 4.10 mol hydrogen, and 2.05 mol carbon.

When a transition metal reacts with chlorine, what types of bonds are formed between the two elements? A) ionic bonds B) covalent bonds C) transition bonds D) No bonds are formed.

How many grams of hcl are produced when 10.0 g of cl2 and 1.00 g of h2 react? h2 (g) cl2 (g) - - - > 2 hcl (g) ?

A person has a mass of 1000g and an acceleration of 20 m/s/s. What is the force on the person? A.) 20000 N B.) 2000N C.) 20N D.) 200N