science- 18th may 2026

elements- easy

100

H

hydrogen 

200

Na

sodium 

300

Fe

iron 

400

Mg

magnesium 

500

B

boron 

elements- difficult

100

Si

silicon 

200

Ne

neon 

300

Cu

copper

400

As

arsenic

500

Sn

tin 

salts/products

100

what is the name for a positively charged ion?

cation 

200

what is the name for a negatively charged ion?

anion 

300

what acid do sulphates come from?

sulfiric acid

400

what acid to nitrates come from?

nitric acid 

500

what acid do chlorides come from?

hydrochloric acid

ions

100

what is the formula for H⁺ and Cl^-?

HCl

200

what is the formula for Na⁺ and OH^-?

NaOH

300

what is the formula for K⁺ and O^2-

K₂O

400

what is the formula for Cu²⁺ and O^2-

CuO

500

what is the formula for Al³⁺ and O^2-

Al₂O₃

general

100

which number is the atomic number?

smaller number 

200

what pH is considered neutral?

7

300

what pH would a strong acid be?

1

400

what color would a strong base show with universal indicator?

dark purple 

500

what will an acid and a base create every time?

a salt and water