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Intro to periodic table and chemical reactions!! Yr 8 Flashcards | StudBud
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Intro to periodic table and chemical reactions!! Yr 8
Intro to periodic table and chemical reactions!! Yr 8
20 terms
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a quiz about #elements, the #periodictable and #chemicalreactions for Vic Year 8's
Flashcards
20 cards
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Questions
20
Answers
1
What are the signs that a chemical reaction has taken place?
you need to clean up afterwards
bubbles, precipitate, change in colour or temperature
an explosion
it smells different
2
What is the Atomic Number of an atom?
the number of electrons
the number of charges
the number of neutrons
the number of protons
3
An exothermic reaction produces....
heat
oxygen
fire
rust
4
Combustion reactions
are?
a substance reacts with oxygen and carbon dioxide released
a substance reacts with carbon dioxide and heat is released
a substance reacts with air and heat is released
a substance reacts with oxygen and heat is released
5
What is the periodic table for?
to display and organise all of the currently known elements
to help visualise that some elements are similar
to create confusion with descriptions of made-up things
to group the elements by the number of atoms they have
6
What is a chemical change?
a change that creates something new
a change that is usually not reversible
a change that is permanent
a change that is reversible
7
An element is..
a substance made of two or more types of electrons
a substance made of one type of atom
a substance made of two or more types of atom
a substance made of two or more types of compounds
8
In our bodies, which element is the most abundant?
carbon
hydrogen
oxygen
neutrons
9
Which element is the most common on Earth?
carbon
nitrogen
radon
hydrogen
10
What is the charge on a proton?
neutral
positive
science hasn't discovered this yet
negative
11
What happens to the atoms in substances that take part in chemical reactions?
electrons are shared but no new substances are formed
electrons are attracted to other atoms
atoms split and new combinations of atoms are formed
bonds are fixed and new bonds cannot be formed
12
What are reactants?
they are the ingredients of a prac
substances that react together
people who overreact to things
substances that are produced by a reaction
13
The nucleus of an atom contains...
protons, neutrons and electrons
protons and neutrons
protons and electrons
electrons and neutrons
14
What is the chemical formula for carbon dioxide?
C6H12O6
C2O2
CO2
CO
15
When a metal reacts with hydrochloric acid, the products are?
hydrogen gas and metals
a salt and oxygen gas
a salt and hydrogen gas
a salt and halogen gas
16
In the chemical equation 2Hg + 2O2 → 2HgO which part is the product?
mercury oxide
hydrogen
HgO
Hg
17
What is a chemical formula?
a chemical reaction written as chemical symbols
a chemical reaction that makes a new substance
a chemical reaction written as words
a special liquid that has chemicals in it
18
What is a physical change?
any change that involves molecules
any change that requires exercise
any change that creates something new
any change in shape, state or size
19
Which two elements, when combined, form water?
hydrogen and oxygen
hydrogen and sulphur
oxygen and carbon
oxygen and arsenic
20
Why do you have to act safely in the science lab?
so that you don't accidentally hurt yourself or others
so that you get to participate in every prac
so that you don't damage school property
so that you get to wear lab coat and goggles
