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# Tenth Grade (Grade 10) Chemistry Questions

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Carbohydrates are made up of the three elements of
1. nitrogen, oxygen, and hydrogen.
2. carbon, hydrogen, and oxygen.
3. sulfur, hydrogen, and oxygen.
4. nitrogen, phosphorus, and oxygen.
To balance a chemical equation, you may adjust the
1. coefficients.
2. subscripts.
3. formulas of the product.
4. either of coefficients or subscripts.
Grade 10 Periodic Table and Elements
The atomic number of an atom is always equal to
1. the number of neutrons
2. the number of electrons
3. the number of protons
4. the number of protons plus neutrons
Which macromolecule holds genetic information?
1. nucleic acids
2. carbohydrates
3. lipids
4. proteins
Grade 10 Molecules and Compounds
What is the correct name for the compound $MgO$?
1. magnesium trioxide
2. dimagnesium trioxide
3. magnesium oxide
4. magnesium oxygen
Grade 10 Periodic Table and Elements
The alkaline earth metal in period 5 is
2. Niobium
3. Rubidium
4. Strontium
A carbohydrate is an organic compound because it contains
1. phosphorus.
2. carbon.
3. hydrogen.
4. oxygen.
Grade 10 Quantum Physics and the Atom

This question is a part of a group with common instructions. View group »

Which of the following represents a correct ground-state electron configuration for a silicon atom?
1. $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2$
2. $1s^2 2s^2 2p^4 3s^2 3p^4$
3. $1s^2 2s^2 2p^6 3s^2 3p^2$
Grade 10 Atomic Structure
Which of the following atoms has the fewest electrons?
1. ${::}_53^127I$
2. ${::}_52^128Te$
3. ${::}_51^123Sb$
4. ${::}_50^121Sn$
Grade 10 Properties of Matter
The color of a substance is called a                  .
1. physical property
2. chemical property
3. physical change
4. chemical change
Grade 10 Atomic Structure

This question is a part of a group with common instructions. View group »

In a famous experiment conducted by Ernest Rutherford, positively charged alpha particles were scattered by a thin gold foil. Which of the following is a conclusion that resulted from this experiment?
1. The nucleus is negatively charged.
2. The atom is a dense solid and is indivisible.
3. The mass is conserved when atoms react chemically.
4. The nucleus is very small and the atom is mostly empty space.
Grade 10 Biochemical Pathways
Living things get the energy they need from
1. oxygen.
2. $NAD^+$.
3. food.
4. air.
Grade 10 Periodic Table and Elements
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