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WorksheetsChemistry Quiz
Total questions: 22
Worksheet time: 12mins
Serotonin is a chemical substance that acts as a neurotransmitter. It helps relay messages to the brain. One molecule of serotonin is shown below: C₁₀H₁₂N₂O. How many TOTAL ATOMS are in one molecule of serotonin?
24
25
26
27
The chemical formula for sodium sulfate is shown below. Na₂SO₄. How many sulfur atoms are in this compound?
2
1
0
6
Which of the following accurately describes the number of total aluminum and total oxygen atoms in this compound?
4Al2O3
6 atoms of aluminum and 7 atoms of oxygen
2 atoms of aluminum and 3 atoms of oxygen
8 atoms of aluminum and 12 atoms of oxygen
8 atoms of aluminum and 3 atoms of oxygen
The chemical formula for the mineral dolomite is CaMg(CO₃)₂. How many atoms of carbon are present in dolomite?
2
3
6
8
A student is using colored beads to make a model of aluminum sulfate Al₂(SO₄)₃. Aluminum atoms are represented by blue beads. Sulfur atoms are represented by yellow beads. Oxygen is represented by green beads. What combination of beads should the student use for the model?
6 blue, 3 yellow, 7 green
2 blue, 1 yellow, 8 green
6 blue, 3 yellow, 12 green
2 blue, 3 yellow, 12 green
A student completes the following graphic in a science journal. Which statement correctly identifies location A in this graphic?
Determines the number of molecules in a chemical formula
Identifies the number of elements in a chemical formula
Indicates that the coefficient and subscripts must be multiplied
Determines the number of atoms of a specific element are in the formula
Four students were asked to write a chemical formula using the information provided. Which student formulated the correct chemical formula for this substance?
Student A: So₂SO₄
Student B: Na₂SO₄
Student C: SoSO
Which description correctly identifies the substance below? 5Ca(OH)₂
5 atoms of calcium, 10 atoms of oxygen, and 2 atoms of hydrogen
8 total atoms
5 molecules, each containing 1 calcium atom, 2 oxygen atoms, and 2 hydrogen atoms
10 atoms of calcium, 2 atoms of oxygen, and 2 atoms of hydrogen
A chemical formula is presented below and represents 5 molecules of caffeine.
5C8H10N4O2
How many atoms of Nitrogen are in one molecule of caffeine?
20
9
8
4
The chemical equation for photosynthesis is shown below.
How many total oxygen atoms are on the product side?
12
4
36
18
A group of students are generating a statement that accurately describes the chemical formula displayed below. C₃H₇NO₂ What information would accurately complete the statement? Move ONE correct answer to each box. There are ___ elements and ___ total atoms involved in the chemical formula displayed.
3 elements and 9 total atoms
2 elements and 12 total atoms
4 element and 13 total atoms
3 elements and 12 total atoms
As part of a demonstration, Mr. Wadlow took a flat copper wire (Cu), wrapped it around a pencil to make a coil, and then placed the coiled copper wire into a beaker of clear silver nitrate (2AgNO₃) solution.
After thirty minutes, gray particles collected on the copper, and the solution turned blue.
The formula shows the reaction: Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag.
What happened during Mr. Wadlow's demonstration?
The atoms in the silver nitrate solution and copper (II) nitrate solution rearranged as they reacted, producing copper particles and silver particles.
The atoms in the copper and silver nitrate solution rearranged as they reacted, producing silver particles and copper (II) nitrate solution.
The atoms in the silver and copper (II) nitrate solution rearranged as they reacted, producing copper particles and silver nitrate solution.
The atoms in the silver and copper rearranged as they reacted, producing silver nitrate solution and copper (II) nitrate solution.
Which of the following equations follows the law of conservation of mass? There are 2 correct answers
AgNO₃ + H₂S → Ag₂S + 2HNO₃
C + H₄ → 4CH
Fe₂O₃ + H₂ → 2Fe + 3H₂O
3Zn(OH)₂ + 2H₃PO₄ → Zn₃(PO₄)₂ + 3H₂O
Mg(ClO₃)₂ → MgCl₂ + 3O₂
A student was studying chemical reactions in class and wrote the equation below: Cu + 2AgNO₃ → 2Ag + Cu(NO₃)₂. The student is asked to determine the number of elements in the equation. Enter the correct answer in the box.
(a)
Which of the following contains the greatest number of elements?
S₈
CH₄
AlCl₃
HNO₂
Use the chemical formula below to complete the following statements by selecting the correct answers from the drop-down menus. H₃PO₄
The chemical formula displayed above contains ___ different elements and ___ total atoms. There are ___ more oxygen (O) atoms than phosphorus (P) atoms.
3 different elements, 8 total atoms, 3 more oxygen atoms
4 different elements, 9 total atoms, 2 more oxygen atoms
3 different elements, 7 total atoms, 4 more oxygen atoms
2 different elements, 8 total atoms, 3 more oxygen atoms
Two solutions are mixed and react to produce the solid precipitate AgCl. The chemical reaction is shown by the balanced chemical equation. AgNO₃ + NaCl → AgCl + NaNO₃ What happens to the total mass as the reaction takes place?
The mass increases.
The mass decreases.
The mass remains constant.
The mass first decreases and then increases.
The pictures below were taken of Reginald the Robot before and after he got stuck outside in the rain. What has the rain most likely done to Reginald?
It caused a chemical reaction that combined the atoms in his metal body, causing it to melt.
It caused a chemical reaction that heated up the atoms in his metal body, causing it to burn.
It caused a chemical reaction that rearranged the atoms in his metal body, causing it to rust.
It caused a chemical reaction that destroyed the atoms in his metal body, causing it to decay.
Ling measured out 45 grams of vinegar and 10 grams of baking soda. When she mixed them together, bubbling occurred. After the bubbling stopped, she weighed the mixture and found that it weighed 54 grams. Which of the following best explains why the mixture weighs less than the original ingredients?
Some of the vinegar evaporated during the experiment.
The new solution is less dense than vinegar or baking soda.
The baking soda is floating on top of the vinegar.
The chemical reaction created a gas that left the mixture.
Which of the following could be the hypotheses for an experiment that demonstrates the law of conservation of mass in relation to chemical equations?
If the equation is balanced, then mass will be the same before and after the reaction.
If the equation is unbalanced, then mass will be the same before and after the reaction.
If the equation is balanced, then mass will be different before and after the reaction.
If the equation is balanced, then volume will be different before and after the reaction.
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