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WorksheetsChemestry Class
Total questions: 15
Worksheet time: 8mins
Name
Class
Date
1.
How many protons, neutrons, and electrons are present in an atom of Cadmium, Cd, with a mass of 112 amu?
a)
48 protons, 112 neutrons, 64 electrons
b)
48 protons, 160 neutrons, 48 electrons
c)
48 protons, 64 neutrons, 48 electrons
2.
An atom of a certain element has 36 protons, 36 electrons, and a mass number of 84. At room temperature this element is a very stable gas. How many neutrons are in this atom?
a)
36
b)
48
c)
84
3.
What type of particles are found in the cloud surrounding the nucleus?
a)
Positively charged particles and negatively charged particles.
b)
Negatively charged particles only.
c)
Neutral particles and positively charged particles.
4.
What is the mass number of potassium (K) atom that has 20 neutrons?
a)
18
b)
20
c)
39
5.
An atom has 25 protons, 30 neutrons, and 25 electons. What is the charge of the atom's nucleus?
a)
+25
b)
+30
c)
-25
6.
The atoms of a certain element each contain 11 protons and 1 valence electron. Which statement identifies this element and its chemical reactivity?
a)
The element is sodium, and it is highly reactive.
b)
The element is fluorine, and it is not reactive.
c)
The element is sodium, and it is not very reactive.
7.
A chemist is identifying the elements present in a sample of seawater. What characteristic of an element's atoms always determines the element's identity?
a)
The number of neutrons.
b)
The number of protons.
c)
The number of valence electrons.
8.
The table below list three characteristics of an atom of an element.
An atom of which element is described by the data in the table?
An atom of which element is described by the data in the table?
a)
Radon (Rn)
b)
Cadmium (Cd)
c)
Rubidium (Rb)
9.
A model of an atom is shown on your worksheet. An atonm of which element is represented by this model?
a)
Boron (B)
b)
Carbon (C)
c)
Sodium (Na)
10.
Which two elements are in the same period?
a)
Sn and Rb
b)
F and Cl
c)
K and Ba
11.
Study the diagram on your worksheet. A student is asked to identify an element that is a pale-yellow brittle solid and does not conduct electricity. At which location would the element most likely be found?
a)
1
b)
3
c)
4
12.
Based on its chemical formula, which of the following substances is an organic compound?
a)
Urea, CH4N2O
b)
Ammonium sulfide, (NH4)22S
c)
Silane, SiH4
13.
Which substance represented in this equation is classified as an element?
a)
CO
b)
H2O
c)
H2
14.
How many atoms are represented in the reactants in the equation on your worksheet?
a)
36
b)
12
c)
24
15.
Coal contains carbon and other elements. Which of these is the best evidence that a chemical reaction occurs when coal burns?
a)
The shape of the coal changes.
b)
A new substance is produced.
c)
Coal is made up of more than one element.
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