Recognize that chemical formulas are used to identify substances and determine the number of atoms of each element in chemical formulas containing subscripts; and
Describe the structure of atoms, including the masses, electrical charges, and locations, of protons and neutrons in the nucleus and electrons in the electron cloud;
Investigate how evidence of chemical reactions indicates that new substances with different properties are formed and how that relates to the law of conservation of mass.
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Q 1/21
Score 0
The table lists some compounds found in foods and their formulas. Based on this information, which of these statements is NOT true?
60
A molecule of lactose contains twice as many carbon atoms as a molecule of sorbitol does.
A molecule of fructose contains four more atoms than a molecule of glutamine does.
A molecule of lactose contains twice as many atoms as a molecule of fructose does.
A molecule of sorbitol contains three more oxygen atoms than a molecule of glutamine does.
Q 2/21
Score 0
A chemist made the table below to record some atomic properties of four elements. Based on the information in the table, which conclusion about the chemical reactivity of these elements is valid?
60
Gallium is the most reactive because it has many more neutrons than protons.
Fluorine is the most reactive because it has 7 electrons in the outer shell.
Boron is the most reactive because it has the most protons.
Silicon is the most reactive because it has an equal number of protons and neutrons.
21 questions
Q.
The table lists some compounds found in foods and their formulas. Based on this information, which of these statements is NOT true?
1
60 sec
8.5d
Q.
A chemist made the table below to record some atomic properties of four elements. Based on the information in the table, which conclusion about the chemical reactivity of these elements is valid?
2
60 sec
8.5b
Q.
Which pair of properties describes the elements in Group 18?
3
60 sec
8.5c
Q.
What is the total number of protons, neutrons, and electrons in a cadmium, Cd, atom that has a mass number of 112? Be sure to use the correct place value.
4
60 sec
8.5a
Q.
5
60 sec
8.5d
Q.
A student is studying calcium, a highly reactive element that humans need for strong bones. Which characteristic of calcium is most closely related to its chemical reactivity?
6
60 sec
8.5b
Q.
A model of a beryllium atom is shown below. What types of particles are found in the cloud surrounding the atom’s nucleus?
7
60 sec
8.5a
Q.
The chemical formula for sodium sulfate is $Na_{2}SO_{4}$ .
How many sulfur atoms are in the formula for sodium sulfate?
8
60 sec
8.5d
Q.
What is the mass number of a potassium (K) atom that has 20 neutrons?
9
60 sec
8.5a
Q.
10
60 sec
8.5d
Q.
A student is studying the ways different elements are similar to one another. Diagrams of atoms from four different elements are shown below. Which two atoms are of elements in the same group in the periodic table?
11
60 sec
8.5c
Q.
The table below lists three characteristics of an atom of an element. An atom of which element is described by the data in the table?
12
60 sec
8.5b
Q.
Element R and Element Q have the same number of valence electrons. These elements both have similar chemical behavior, but Element R has fewer energy levels than Element Q. Which statement best describes the positions of the two elements in the periodic table?
13
60 sec
8.5c
Q.
What is the difference between the number of electrons in an atom of selenium, Se, and the number of electrons in an atom of aluminum, Al? Be sure to use the correct place value.
14
60 sec
8.5a
Q.
Four students were asked to name the parts of an atom that determine the atom’s identity and chemical properties. The students’ responses are shown in the table below. Which student’s responses are correct?
15
60 sec
8.5b
Q.
16
60 sec
8.5d
Q.
17
60 sec
8.5e
Q.
Students in a science class prepared flash cards so that they could quiz one another about the arrangement of the periodic table. One of the flash cards contained information about two elements, Element L and Element M. The students had to use the information on the flash card to determine possible positions of the two elements on a blank periodic table. Which periodic table has the elements placed in locations that match the information on the flash card?
18
60 sec
8.5c
Q.
How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178?
19
60 sec
8.5a
Q.
The table shows the chemical formulas for four substances. Which substances have the same number of carbon atoms?
20
60 sec
8.5d
Q.
Tin, Sn, is a soft white metal. It has a low melting point compared with other metals. Tin is widely used as a coating for cans of food. Which statement accurately describes atoms of tin?
