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Exam (elaborations)

CRT Science Exam Questions & Answers 2024/2025

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CRT Science Exam Questions & Answers 2024/2025 What is the smallest unit of an element that still has the properties of that element? - ANSWERSAn atom Pure water is neutral and has a pH of 7. When lemon juice is added to water the pH will become lower than 7 and turns litmus paper red. L...

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  • August 26, 2024
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • CRT Science
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CRT Science Exam Questions &
Answers 2024/2025

What is the smallest unit of an element that still has

the properties of that element? - ANSWERSAn atom



Pure water is neutral and has a pH of 7. When lemon

juice is added to water the pH will become lower than

7 and turns litmus paper red. Lemon juice is - ANSWERSan acid.



A student has two unknown substances that must be

classified into states of matter. Which properties

would be used? - ANSWERS. Shape and volume



. Which of the following describes the differences

between solids and liquids? - ANSWERSSolids have a definite volume and shape, but

liquids only have a definite volume.



5. According to the Law of Conservation of Mass, the

number of iron atoms needed to complete the

following reaction is

___Fe + 3O2 2Fe2O - ANSWERS4



Use a periodic table to answer the following question.

Which group of elements would be expected to have

similar properties? - ANSWERSOxygen, sulfur, selenium

, . How many electrons are in a neutral atom with an

atomic number of 12? - ANSWERS12



The mass number of an element is the total number

of protons and neutrons located in the nucleus. If

carbon has an atomic number of 6 and a mass

number of 12, how many neutrons does it contain? - ANSWERS6



. When salt dissolves in water, the water is the - ANSWERS. solvent.



Which of the following is a chemical property of

matter? - ANSWERSFlammability



Which of the following pairs of compounds contain

the same number of atoms, but different kinds of

atoms? - ANSWERS. CO2 and CaCl2.



When sulfuric acid, H2SO4, is broken down into

separate elements, how many different atoms result? - ANSWERSThree



An oxygen atom has 8 protons, 8 neutrons and 8

electrons. If the oxygen atom gains two electrons to

form an oxygen ion, what will be the magnitude and

sign of the charge? - ANSWERS-2



Atoms of an element contain only one type of atom

because they each contain the same number of - ANSWERSprotons.



A student is given a sample of an unknown liquid to

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