Chemistry Review

Chemistry Review

​Stevie is writing an essay for her chemistry class, but she seems to be missing some information. Help Stevie complete her essay by filling in the missing information!

Exploring the Magical World of Atoms and Molecules: A Fun Adventure in Chemistry

By Stevie James

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Introduction:

Welcome, young scientists, to the amazing world of ​

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! Today, we're embarking on an exciting journey to discover the ​

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blocks of everything around us – ​

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and molecules. Get ready to dive into the tiny, yet fascinating ​

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that makes up our world!

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atoms

chemistry

building

universe

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Atomic Structure:

Let's start by zooming in, way in, to the smallest particles of ​

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– atoms! Picture atoms as tiny, busy solar systems, with a ​

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at the center and ​

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zooming around like planets. The nucleus is made up of even tinier particles called ​

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and neutrons, while the electrons whirl around in energy levels or ​

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.

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matter

nucleus

electrons

protons

shells

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Subatomic Particles:

Now, let's meet the stars of our atomic show – the ​

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particles! Protons carry a ​

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charge, ​

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have no charge (they're neutral), and ​

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are negatively charged. These tiny particles work together to give each atom its unique ​

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.​

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subatomic

positive

neutrons

electrons

properties

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Molecules, Compounds, and Elements:

Atoms are like LEGO blocks, and when they join together, they form ​

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. If the molecules are made of just one ​

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of atom, we call them ​

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. But if different types of atoms come together, they create ​

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. For example, water is a compound made of two ​

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atoms and one oxygen atom.

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molecules

type

elements

compounds

hydrogen

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Atomic Number, Atomic Mass, and Element Symbol:

Every atom is like a secret agent with its own ID card. The atomic ​

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tells us the number of ​

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in an atom's ​

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, while the atomic ​

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is the total number of protons and neutrons. Each element has its own ​

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, like "H" for hydrogen and "O" for oxygen, making it easier for scientists to communicate about them.

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number

protons

nucleus

mass

symbol

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The Periodic Table of Elements:

Imagine a big family reunion where all the elements gather together – that's the ​

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! It's like a giant puzzle, organizing ​

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based on their ​

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. You can find metals, nonmetals, and metalloids, all neatly arranged in rows called ​

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and columns called ​

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.

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elements

properties

periods

groups

periodic table

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Atomic Behavior:

Atoms are like tiny magnets, with ​

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protons attracting ​

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electrons. This attraction keeps the electrons buzzing around the nucleus. But atoms are also like social butterflies – they love to share or steal electrons to become ​

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. This behavior determines how atoms interact with each other and form ​

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.

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positive

negative

stable

compounds

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Positive or Negative

An atom usually has a ​

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charge because the number of ​

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equals the number of electrons. So the atom has a balanced number of protons and electrons, canceling out each other's charges and resulting in a charge of zero. But sometimes, an atom ​

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one or more electrons, leaving it with more protons than ​

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. This imbalance gives the atom a ​

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charge, turning it into a positive ion.

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neutral

protons

loses

electrons

positive

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Reactants and Products in a Chemical Equation:

Chemical reactions are like magical transformations where reactants turn into products. A chemical equation is like a ​

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, showing us what ​

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(reactants) are needed and what ​

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(products) are formed. For example, when hydrogen gas reacts with ​

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gas, they produce ​

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!

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recipe

ingredients

new substances

water

oxygen

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Chemical Change vs. Physical Change:

Imagine baking a cake – mixing ​

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, baking in the oven, and voila! You have a delicious treat. ​

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changes are like baking a cake – ​

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are formed, and it's hard to go back to the original ingredients. Physical changes, on the other hand, are like ​

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– the substance changes form, but its identity remains ​

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.

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new substances

melting ice

the same

ingredients

Chemical

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Synthetic Materials in Chemistry:

Chemistry isn't just about natural substances – we can also create ​

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materials! From plastics to medicines, synthetic materials are made through ​

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reactions in ​ labs. It's like playing mad scientist and inventing new stuff! ​

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is the most widely used synthetic material in the world but also one of the most environmentally ​

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. Its manufacture alone is responsible for about 5% of global ​

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(CO2) emissions.

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synthetic

chemical

Concrete

unfriendly

carbon dioxide

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The numbers placed in ​

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of formulas to balance equations are called ​

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, and they multiply all the atoms in a ​

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. Thus, the symbol “2NaHCO₃” indicates ​

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units of sodium bicarbonate, which contain 2 Na atoms, 2 H atoms, 2 C atoms, and 6 O atoms (2 X 3= 6, the coefficient times the subscript for O).

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front

coefficients

two

formula

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Particle Motion When Energy is Added or Removed:

Picture atoms as tiny dancers at a party – when we ​

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energy (like heat), they start moving ​

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and bumping into each other. This can lead to changes in ​

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, like melting or boiling. ​

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energy (cooling things down) ​

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the dance, causing freezing or condensation.

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add

faster

state

Removing

slows down

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The Driving Force Behind Matter Changing State:

​

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is like the DJ at the atomic dance party – it controls the energy level of the atoms. When temperature rises, atoms ​

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energy and change ​

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, like melting from a solid to a liquid. When temperature ​

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, atoms lose energy and ​

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or condense.

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Temperature

gain

state

drops

solidify

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Exothermic and Endothermic Reactions:

Chemical reactions can ​

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or absorb energy. ​

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reactions give off ​

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or light, like a cozy fire warming us up. ​

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reactions absorb energy, making things feel colder, like an ice pack cooling a bruise. However, baking a cake is also considered endothermic because it involves the ​

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of heat from the oven.

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release

Exothermic

Endothermic

heat

absorption

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Thermal Energy Applied to Chemistry:

Thermal energy is directly related to the motion of particles in a substance. The ​

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the particles move, the more thermal energy they have. This is because thermal energy is the total kinetic energy of all particles in a substance. So, when the particles move faster, they have more kinetic ​

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, which increases the ​

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energy. Conversely, if the particles ​

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, they have ​

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kinetic energy and the thermal energy decreases.

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faster

energy

thermal

slow down

less

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Thermal Energy Applied to Chemistry:

Thermal energy is directly related to the motion of particles in a substance. The ​

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the particles move, the more thermal energy they have. This is because thermal energy is the total kinetic energy of all particles in a substance. So, when the particles move faster, they have more kinetic ​

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, which increases the ​

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energy. Conversely, if the particles ​

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, they have ​

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kinetic energy and the thermal energy decreases.

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faster

energy

thermal

slow down

less

Conclusion:

Congratulations, young scientists, you've just unlocked the secrets of the atomic world! From the tiniest particles to the grand periodic table, chemistry is all around us, shaping the world we live in. So keep exploring, keep experimenting, and who knows – maybe you'll discover the next big breakthrough in chemistry!