Atoms and their structure.
True or false: Atoms are the smallest unit alive, and they are made of tissue and organelles.
False, atoms are not alive, and are not made up by tissue and organelles, their made of protons, neutrons and electrons.
*You need to have your periodic table for this one* What is the symbol of the element of Hydrogen?
The symbol for the element of hydrogen is H
Pure gold is an element, compound or mixture?
Pure gold is an element.
Melting and freezing are examples of a...
A. physical change
B. chemical change
Melting and freezing are examples of a physical change
Is steel a homogenous or heterogenous type of mixture?
Which subatomic particle defines the identity of an element?
A. Protons
B. Electrons
C. Compounds
A. Protons
*You need to have your periodic table for this one*
In which family is Helium?
Hint: Element with symbol He, atomic number of 2 and is on the upper right corner of the table
Helium is in the family Noble Gases.
The type of substance which is always made up of a single type of atom is an...
A. Element
B. Compound
C. Mixture
A. Element
Is a baking soda and vinegar reaction a physical or chemical change?
It is a chemical change, because there is fizzling, heating, etc...
Is an Ice cream with chocolate chips an homogenous or heterogenous mixture and which type is it?
an Ice cream with chocolate chips is and heterogenous type of mixture being a suspension type.
What is the charge of an atom that has 4 electrons and 2 protons?
it has a charge of -2.
*You need to have your periodic table for this one*
What information can NOT be found in a periodic table about an element:
A. Name and symbol of the element.
B. Family and number of valence electrons of element.
C. Compounds the element can make
D. Number of orbitals of the element.
A (normal) periodic table does not include the compounds the element can make, so the answer is:
C. Compound the element can make.
Select which one is a compound, which one is an element and which one is a mixture: Air, oxygen and carbon dioxide?
Air is a mixture; Oxygen is an element and carbon dioxide is a compound.
An example of a chemical change is:
A. Burning wood
B. Cutting paper
C. Tearing (breaking and changing shape) a paper.
An example for a chemical change is A. Burning Wood.
*Really Hard*
Jonathan made strawberry juice made with pulp, he knows that the juice is an heterogenous type of mixture, but he doesn't know if it is a suspension or colloid, which one is it?
*Answer if strawberry juice with pulp is a colloid or suspension*
The strawberry juice made with pulp would be an heterogenous, suspension type of mixture, this is because a suspension is a mixture that contains particles that are large enough that they settle over time.
*It is a heterogenous suspension type of mixture*
Name one of the atom models proposed.
Example answers: John Dalton´s solid sphere model or Thomson´s plum pudding model
*You need to have your periodic table for this one*
Which element has the biggest atomic number: Boron, Oxygen or Hydrogen?
Oxygen has a biggest atomic number, being of 8.
True or false: a compound is two or more ELEMENTS chemically combined that can ONLY be chemically broken down.
This statement is TRUE
What are 2 signs that show us that a chemical reaction is happening?
Example Answer: 2 Signs that a chemical reaction is happening are fizzling and heating or cooling (exothermic and endothermic reactions).
True or false: an alloy is a mixture of a chemical element(s) where the primary component is a metal.
The answer is true; an alloy Is a mixture of chemical elements where the primary component Is metal.
Ex: Bronze: 78-95% copper to 5-22% tin.
What is the difference between 2 or more isotopes of the same element?
Each isotope from the same element has a different number of neutrons.
*You need to have your periodic table for this one*
What is the family and atomic number of Krypton?
Krypton is on the Noble Gases Family, having an atomic number of 36.
Which one of this is a compound: H2O+CO2, a juice made with pulp, NaCl (table salt) or milk?
The NaCl (table salt) is the compound.
*REALLY HARD: 600 points for this one*
Miss Ana and Miss Priscila are making an experiment to see what happens when Zinc and hydrochloric acid are combined in a test tube, The starting weight of the mixture is 20 grams (Counting the zinc and hydrochloric acid together) but then when the reaction starts happening and the test tube heats, bubbles form and then the mixture´s weight goes down by 10 grams, at last the mixture ends up in 10 grams of total of weight, can you explain to Miss Ana and Miss Priscila why this occurred?
Example Answer: The 10 grams of weight didn't disappear but evaporated when the chemical reaction started happening, I know this was a chemical reaction because of the heat and fizzling produced so the missing 10 grams probably evaporated when the reaction happened.
Is milk an heterogenous or homogenous type of mixture?
The milk is an heterogenous type of mixture, being a colloid.