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;
Recognize that chemical formulas are used to identify substances and determine the number of atoms of each element in chemical formulas containing subscripts; and
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 1/10
Score 0
Which statement correctly describes the location and charge of the electrons in an atom?
30
The electrons are outside the nucleus and have no charge.
The electrons are outside the nucleus and have a negative charge.
The electrons are inside the nucleus and have a negative charge.
The electrons are inside the nucleus and have no charge.
Q 2/10
Score 0
How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178?
30
178 protons, 250 neutrons, 72 electrons
72 protons, 106 neutrons, 72 electrons
72 protons, 178 neutrons, 106 electrons
106 protons, 72 neutrons, 106 electrons
10 questions
Q.
Which statement correctly describes the location and charge of the electrons in an atom?
1
30 sec
8.5a
Q.
How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178?
2
30 sec
8.5a
Q.
When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically. Which property of the unknown element determines the other elements it reacts with?
3
30 sec
8.5b
Q.
The atoms of a certain element each contain 11 protons and 1 valence electron. Which statement correctly identifies this element and describes its chemical reactivity?
4
30 sec
8.5b
Q.
A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass. Which element should the researcher select for the experiment?
5
30 sec
8.5c
Q.
The periodic table is organized into groups and periods of elements. The characteristics of a certain group of elements are listed. Which of these elements is in this group?
6
30 sec
8.5c
Q.
Which information could a student determine from only the chemical formula of a protein?
7
30 sec
8.5d
Q.
In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
8
30 sec
8.5d
Q.
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
9
30 sec
8.5e
Q.
During an investigation, a student combined the two clear, colorless solutions shown below. The student observed that the temperature changed from 25°C to 23°C when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?
