🧬🧪🔭🔬 SCIENCE FINAL

common lets grind

What tool is used to measure the mass of an object?

Triple beam balance/digital balance

What tool is used to measure temperature?

Thermometer

What is the basic metric unit of length?

Meter

 Mass is defined as:

the amount of matter in an object

What should you do if there is an accident or injury in the lab?

Raise your hand and tell the teacher

What are the building blocks of all matter?

atoms

he length of a highway would most likely be measured in what metric units?

Kilometers

Write the chemical symbol for: oxygen:

 O

Write the chemical formula for carbon dioxide:

CO₂

Which one (oxygen or carbon dioxide) is an element?

 Oxygen

How do you know?

 Represented by a single capital letter

The density of water is 

1.0 g/ml

An object with a density of 0.9g/mL will _ in water.

 float

 How do you know if an object will float in water?

If it has a density of less than 1.0 g/ml 

 Round the following numbers to the nearest tenth (0.1). 

444.444- 444.4     33.33- 33.3    55.55- 55.6    79.0- 79.0 

Which phase of matter is characterized by definite shape and a definite volume? 

Solid

 Which phase of matter is characterized by having neither definite shape nor definite volume?

 Gas

In which phase of matter would water molecules have the most energy?

gas

What is the electrical charge of a proton?

positive

What is the electrical charge of a neutron?

neutral / no charge

What is the electrical charge of an electron?

Negative

 What does the atomic number tell you?

The total number of protons

The small positively charged center of an atom is called the

Nucleus

 In a neutral atom, the number of protons must equal

the number of electrons

List the Noble Gases

Helium, Neon, Argon, Krypton, xenon, and radon 

Are the noble gasses reactive?

No they have a full number of valence electrons

What part of an atom is involved during chemical bonding?

Electrons

On the periodic table, where are the metals found?

 On the left side

 In a chemical equation, the arrow represents the word-

Yield

A form of shorthand using symbols and formulas to represent a chemical reaction is called a

chemical equation

 A strong base could have a pH of

8-14.

A strong acid could have a pH of

0-6.

 A neutral substance has a pH of

 7

The universal solvent is

 water

A substance that changes color in the presence of an acid or a base is called a/an

indicator 

What is the mass of a proton?

1 amu

 What is the mass of a neutron?

____1amu____

What is the mass of an electron?

0.54 amu

Where are protons found in the atom?

In the nucleus

Where are neutrons found in the atom?

In the nucleus

Where are electrons found in the atom

Outside the nucleus along orbitals  in the electron cloud 

What do we call the very small center core of an atom?

Nucleus 

Where are the most reactive metals found?

Group 1 and Group 2

.List 3 properties of metals

Conductors, malleable and luster ( metallic)

Three ways in which the solution rate can be increased are

crush it , heat it, and stir it. 

 What is an amorphous solid?

A solid object with no definite shape

 Examples of chemical reactions include

digestion, and combustion

A change from a solid to a liquid is called

melting 

A change from a liquid to a solid is called

 freezing 

Air, saltwater, and raisin bran are all example of

mixtures

List 3 properties of acids

Sour in taste, turns litmus paper red, Contains Hydrogen (h+) ions 

 List three properties of bases

bitter in taste, turns litmus paper blue, contains hydroxide Ions (OH)

What is the freezing point of water?

0⁰C

boiling point of water

100⁰C

What do the following prefixes mean:

  kilo- 1000   centi- 1/100   milli- 1/1000

Matter is anything that

 has a mass and takes up space

An educated guess is called a

hypothesis

In a controlled experiment, the factor being tested or changed is the

Independent variable

The universal solvent is

water

Pure water is classified as a

compound

Of the following, which has the most amount of mass?

Neutron

On the periodic table, where are the most reactive metals?

Group 1 and group 2

On the periodic table, where are the most reactive nonmetals

Group 17

On the periodic table, where are the least reactive elements?

Group 18

 Signs of a chemical change include

color change, bubbling or fizzing  and a change in temperature 

What is the density of a 40 gram object with a volume of 10mL?

4.0 g/ml

If an atom has an atomic number of 3 and a mass of 7, how many neutrons does this atom have?How many protons?

4  neutrons  3 protons

Why does a heated gas rise?

Hot air/ gas is less dense than cold air/gas

What instruments would be needed to find the density of an object?

Triple beam balance, graduated cylinder 

Why does oil float on top of water?

They have different densities

An atom with an atomic number of 12 would have how many electrons in the first energy level?

2

 An atom with an atomic number of 12 would have electrons would this atom have in the second energy level?

8

What is the basic unit of electric charge?

Amperes or amp

 Name two types of electric charge

Positive or negative

What happens when you rub a balloon on your hair?

 You create static electricity 

What is an electric current?

A loop in which electrons are able to move producing electricity.

What are the three main components of a simple electric circuit?

 Power source, load and conductive pathway (wire)

 What's the difference between a conductor and an insulator? Give an example of each.

Conductors allow the flow of electricity through it where insulators do not. An example of a conductor  is copper, aluminum. An example of an insulator is rubber, plastic and glass.  

How does a light bulb work in a circuit?

Uses electrical currents that move through the wire to heat apart of the light bulb that will glow and produce light

What are the two poles of a magnet called?

North and south poles 

 Do like poles attract or repel each other?

repel

What is the name of the area around a magnet where its force can be detected?

 Magnetic field

Name three materials that are attracted to magnets.

 Iron, Cobalt and Nickel

How can you make an electromagnet?

Wrap an insulated wire around a magnetic object 

What is the relationship between electricity and magnetism?

Moving electrical charges produces magnetic fields, and changing magnetic fields can produce electrical currents 

 What type of wave is a sound wave?

Longitudinal

What does the frequency of a sound wave determine?

The number of cycles per second of wave in a given period of time 

What does the amplitude of a sound wave determine?

The amount of energy the wave possesses

Through which medium does sound travel fastest: air, water, or solid?

 Solid

What happens to sound waves when they hit a hard surface?

They bounce off

How are sound waves produced by musical instruments?

Through vibrations in the molecules

  What type of wave is a light wave?

Transverse wave

What is the speed of light in a vacuum?

3 x 10^8 

What are the colors of the visible light spectrum in order?

ROYGBIV

What happens when light hits a mirror?

The image is inverted or backwards and is reflected back at you 

What is refraction?

The bending of light through an object

What is reflection ?

The bouncing back of light waves 

What is lowest point  on a transverse wave called: 

Trough

what is the highest on a transverse wave called: 

crest

thats all 100

GOOD JOB