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Worksheets6th Grade Science 1st 6-Weeks 2021-2022 Test #1
Total questions: 20
Worksheet time: 20mins
6.5A Hydrochloric acid, HCl , is one of the substances found in gastric acid, which helps break down food in the digestive system. What is hydrochloric acid?
A mixture of hydrogen and chlorine atoms
A compound of hydrogen and chlorine atoms
An element made of hydrogen and chlorine atoms
A precipitate made of hydrogen and chlorine atoms
8.5A Which statement correctly describes the location and charge of the electrons in an atom?
The electrons are inside the nucleus and have no charge.
The electrons are outside the nucleus and have no charge.
The electrons are inside the nucleus and have a negative charge.
The electrons are outside the nucleus and have a negative charge.
8.5B Atoms of which two elements have a combined total of 23 protons?
Sodium, Na, and magnesium, Mg
Boron, B, and carbon, C
Copper, Cu, and zinc, Zn
None of these
8.5D Barium sulfate, BaSO₄ , is a white crystalline solid that is insoluble in water. It is used by doctors to diagnose problems with the digestive system. Barium hydroxide, Ba(OH)₂, is also a white crystalline solid and is used in wastewater treatment. How many more oxygen atoms are represented in the formula for barium sulfate than in the formula for barium hydroxide?
(a)
6.5C The table beside describes two experiments. What can the student conclude about the experiments?
Experiment 1 shows a physical change because no new substances were produced, and experiment 2 shows a chemical change because a new substance was produced.
Experiments 1 and 2 show physical changes because no new substances were produced.
Experiment 1 shows a chemical change because bubbles were produced, and experiment 2 shows a physical change because a liquid turned into a solid.
Experiments 1 and 2 show chemical changes because bubbles were produced.
8.5E For a laboratory investigation some students put a strip of shiny metal into a beaker of blue solution and then stored the beaker on a shelf overnight. The next morning, the students recorded observations about the metal and the solution in the box below. Based on their observations, can the students correctly conclude that a chemical reaction occurred?
No, because the metal strip was still visible
Yes, because a new material of a different color formed on part of the metal strip
No, because the solution stayed blue
Yes, because the volume of the blue solution stayed the same
8.5B 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 beside. Which student’s responses are correct?
Student 1
Student 2
Student 3
Student 4
8.5A 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?
(a)
8.5E Which statement best describes evidence that a chemical reaction occurs as a cake bakes?
The water in the cake batter evaporates.
The cake rises as gas bubbles form in the baking cake.
The cake takes the shape of the container in which it is baked.
The water in the cake batter is used to keep the cake moist as it bakes.
8.5D A compound secreted by honeybees to paralyze intruders in their hive is known as 2-heptanone. The formula for this compound is shown.
CH₃ C₄ H₈ COCH₃
How many atoms of each element are in one molecule of 2-heptanone?
4 carbon atoms, 11 hydrogen atoms, and 1 oxygen atom
7 carbon atoms, 14 hydrogen atoms, and 1 oxygen atom
7 carbon atoms, 11 hydrogen atoms, and 8 oxygen atoms
6 carbon atoms, 14 hydrogen atoms, and 3 oxygen atoms
8.5A How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178?
72 protons, 178 neutrons, 106 electrons
72 protons, 106 neutrons, 72 electrons
178 protons, 250 neutrons, 72 electrons
106 protons, 72 neutrons, 106 electrons
6.6A A student is trying to classify an unidentified, solid gray material as a metal or a nonmetal. Which question will best help the student classify the material?
Is the material malleable or ductile?
Does the material feel hard to the touch?
Will the material float in water?
Does the material feel rough or smooth?
8.5C Four students were asked to complete a table for a science assignment. Each student selected one chemical element from each of four groups in the periodic table and then classified each element as a metal, a nonmetal, or a metalloid. Which table was completed correctly?
8.5D In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
H₃PO₄
H₂SO₄
HCIO₃
H₂O
8.5E A silver ring reacts with compounds containing sulfur in the air to form silver sulfide, a black substance that makes up the tarnish on the surface of silver objects. To remove the tarnish from the ring, students placed it in a pan lined with aluminum foil and added hot water. Baking soda was added to the hot water and stirred. Students made observations about the process. Which observation of this process provides evidence of a chemical reaction?
Hot water heated the aluminum foil.
The liquid solution changed color.
The pan was lined with aluminum foil.
The hot water cooled.
8.5B The diagram shows a model of an atom. The model has four different symbols on it. Each symbol represents a different role for one of the particles within the atom.
Particle W
Particle X
Particle Y
Particle Z
8.5C Students were asked to identify the location of elements in the periodic table based on clues printed on game cards. Based on the data, which periodic table shows the correct location of the four elements?
8.5D The table shows the chemical formulas for four substances. Which substances have the same number of carbon atoms?
Substances 1 and 2
Substances 2, 3, and 4
Substances 2 and 3 only
Substances 1 and 3
8.5C A scientist performs tests on a sample of an element. The element is a shiny solid that conducts electricity and heat. The scientist is able to bend and flatten the sample when pressure is applied to it. Based on this information, the element could NOT be a member of which group on the periodic table?
Group 2
Group 8
Group 12
Group 18
8.5C 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?
The two elements are in the same period, with Element R the first element in the period and Element Q the last element.
The two elements are side by side in the same period, with Element Q to the left of Element R.
The two elements are in the same group, with Element R just above Element Q.
The two elements are in the same group, with Element Q at the top of the group and Element R at the bottom.
