NEW
Font size
WorksheetsUPS Trail Chapter 1: MATTER
Total questions: 20
Worksheet time: 33mins
The definition of isotope is ..
two or more atoms of the same element with same number of protons but different number of neutrons.
two or more atoms of the same element with same number of protons but different number of electrons.
two or more atoms of the same elements with same number of nucleon but different number of neutrons.
two or more atoms of the same element with same number of electrons but different number of neutrons.
An atom's atomic number is equal to
The number of protons in the atom's nucleus
The number of neutrons in the atom's nucleus
The number of electrons in the atom
The total of protons + neutrons
What is the mass number of the element shown?
15
7
8
0
An atom has 12 protons and 13 neutrons in its nucleus. Which is the correct symbol?
What does it happen to this atom?
It LOSES electrons
It GAINS electrons
It GAINS protons
It LOSES protons
A formula with the lowest whole number ratio of elements in a compound is called
Molecular Formula
Chemical Formula
Empirical Formula
Distance Formula
What is the empirical formula for hydrogen peroxide which has a molecular formula of H2O2?
HO
H2O2
H2O
The empirical formula for a compound is CH2 and its relative atomic mass (Ar) is 70. What is its molecular formula? Use the periodic table to help you.
CH2
C5H10
C70H140
What coefficient would go in front of the O2?
___KNO3 → ___KNO2 + ___O2
What coefficients are needed to balance the reaction?
2, 2, 1
2, 3, 2
1, 2, 2
1, 3, 1
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
Actual yield = 62g
Calculate the percent yield.
The amount of product that actually forms when a chemical reaction is carried out in a laboratory is called the _________ yield.
actual
theoretical
percent
excess
