Science REVIEW Chemistry
Quiz by TIFFANY SOLOT
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Kevin is drawing a model of an atom. What should he draw in the nucleus of the atom shown here in order to make it uncharged?
2910 Protons
8 Protons
2 Protons
5 Protons
- Q1
Kevin is drawing a model of an atom. What should he draw in the nucleus of the atom shown here in order to make it uncharged?
10 Protons
8 Protons
2 Protons
5 Protons
30s - Q2
Imagine that this dartboard is an atom. Which dart indicates where the valence electrons are located?
Dart D
Dart B
Dart A
Dart C
30s - Q3
A model of an atom is shown. What is the mass of this atom?
8 AMUs
2 AMUs
64 AMUs
4 AMUs
30s - Q4
You make yourself a piece of toast before leaving for school in the morning. What energy transformations are involved in making a piece of toast?
Electrical energy is transformed into heat energy and some light energy in the toaster.
Heat energy is transformed into electrical energy in the toast.
Heat and light energy are transformed into electrical energy in the toast.
Chemical energy is transformed into electrical energy in the toast.
30s - Q5
Atom A has 11 protons, 12 neutrons, and 10 electrons. Atom B has 11 protons, 13 neutrons, and 10 electrons. Which statement is correct?
The atoms are the same element, and they have the same charge.
The atoms are different elements, and they have different charges.
The atoms are different elements, but they have the same charge.
The atoms are the same element, but they have different charges.
30s - Q6
Which of the following is a chemical property of a substance?
boiling point
size
density
reactivity with other substances
30s - Q7
Elements with seven valence electrons —
have a low mass
have a high mass
are highly stable
are highly reactive
30s - Q8
The table below lists elements and their number of valence electrons. Which lists these elements from most reactive to least reactive?
Neon, chlorine, carbon
Chlorine, carbon, neon
Carbon, chlorine, neon
Carbon, neon, chlorine
30s - Q9
A unit of cesium oxalate has two atoms of cesium, Cs, two atoms of carbon, C, and four atoms of oxygen, O. What is the correct way to write the chemical formula for cesium oxalate?
2CsC2O4
CsC2O4
Cs2C2O4
2Cs2C4O
30s - Q10
Sulfur is a nonmetal. Of the following, the physical characteristic that is most likely to describe a sample of sulfur is —
a shiny appearance
ductility
malleability
brittleness
30s - Q11
Part of the periodic table of elements is shown here. According to the table, which element would you expect to have the most metallic properties?
selenium
fluorine
bromine
tellurium
30s - Q12
The atomic mass of fluorine is 18.998. The atomic mass of cadmium is 112.411. Why do the atomic masses of elements include decimals?
The digits to the right of the decimal show the tiny mass of the electrons.
The atomic mass is an average of the measurements of many scientists.
The mass of each atom has been carefully measured to give accurate results.
The atomic mass is an average of atoms with different numbers of neutrons.
30s - Q13
A compound has the chemical formula NaHCO3. How many elements make up one molecule of this compound?
7
4
3
5
30s - Q14
This chemical equation describes one cause of acid rain: 3NO2 + H2O → 2HNO3 + NO How many atoms of oxygen are indicated by 2HNO3 in this reaction?
6
2
3
5
30s - Q15
Which of the following is the best clue that a chemical reaction has taken place?
Change in particle size
Change in color
Change in volume
Change in state
30s
