Chem fall exam

Ace your homework & exams now with Quizwiz!

A bicycle has a speed of 6 m/s. What is its speed in km/h? (1 km=1000 m)

21.6 km/h

What is the definition of matter?

Anything that has mass and takes up space

John Dalton stated:

Atoms are tiny, invisible particles, Atoms of one element are all the same, Atoms of different elements are different, Compounds form by combining atoms

He developed the planetary model of the atom

Bohr

Which scientist developed the atomic theory

Dalton

What is the formula for Mass?

Density x Volume

A formula with the lowest whole # ratio of elements in a compound is called

Empirical Formula

Predict the product(s) of this reaction (Don't worry about balancing)Pb(NO3)2 + KI →

PbI2 + KNO3

Ernst Rutherford discovered which part of the atom through the use of gold foil?

Proton

Atoms are made up of three basic parts, which are -

Protons, neutrons, electrons

The scientist responsible for "discovering" the nucleus is:

Rutherford

3Ca + 2AlCl3 --> 3CaCl2 + 2Al

Single Displacement

When two or more parts are mixed together and chemically combine so that you cannot see the different parts (or different ingredients), it is called a ______________.

Solution

What is the smallest unit of matter in the world?

an atom

The symbol for a substance dissolved in solution is ______

aq

The smallest unit of a pure substance that has the properties of that substance

atom

A physical change...

changes the physical properties of an object, but does not create a new substance.

Cr2O3

chromium (III) oxide

A mixture contains cobalt metal, copper metal, and tin metal. This mixture is mixed with nickel nitrate. Which metals, if any, will react?

cobalt

I am 2 or more elements chemically bonded.

compound

What process takes place when a gas becomes a liquid?

condensation

Name the compound CuO

copper (II) oxide

A chemical change

creates a new substance and cannot be undone.

What is the name for P2O5?

diphosphorus pentoxide

What did Thomson discover?

electron

Where electrons are likely to be found as they travel around the nucleus

electron cloud

If an object has a density of .6 g/mL and you put it into water, will it sink or float?

float

What units are used to measure Density?

g/cm3

What state of matter has molecules that bounce around at high speeds and are not close together?

gas

What units are used to measure mass?

grams

M&Ms

heterogeneous

When a measurement is repeatable and consistent it is said to have...

high precision

air

homogeneous mixture

When is the prefix mono not used?

never on the first element

What will be the result of the following:Br2 + NaF ->

no reaction will occur

What are covalent compounds made up of?

nonmetals

Protons have this charge -

positive

A set of data are all close to each other, but they are not close to the actual value. This set of data can be described as...

precise

How do you calculate mass number?

protons + neutrons

The nucleus is made up of -

protons and neutrons

In covalent bonds elements ____________ electrons.

share

7.82 x 10-6 is an example of scientific notation. The exponent of -6 tells you your number will be very ________.

small

When using scientific notation, a negative exponent means ...

the standard number is less than one

Why do ice cubes float in a glass of water?

the water is more dense than the ice cubes

Rutherford's gold foil experiment provided evidence that...

there is a dense positively charged nucleus at the center of an atom.

Neutrons have this charge

neutral

Isotopes of an element have a different number of...

neutrons

Convert this number to standard notation: 1.4 x 10-2

0.014

The students measured length during a science experiement, they got 12 cm. But the actual measurement was 14.25 cm. What was the percent error?

15.79%

What is the molar mass of fluorine gas?(beware!)

38 g/mol

Bromine-80 has how many neutrons?

45

How many significant figures: 100.000 cL

6

Write 6,700 in scientific notation.

6.7 x 103

Convert this number into scientific notation: 0.068

6.8 x 10^-2

6 kg = _____ g

6000

Jack has a rock. The rock has a mass of 14g and a volume of 2cm3. What is the density of the rock?

7 g/cm3

Convert this number to standard notation: 7.1 x 104

71,000

Convert this number into scientific notation: 950,000

9.5 x 10^5

How close a measurement is to the true value is called..

Accuracy

What scientist is best known for his "Plum Pudding" model of the atom?

J.J Thompson

Aluminium is more reactive than ....

Lead and Iron

Predict the product(s) of this reaction (don't worry about balancing): Li + H2O →

LiOH + H2

What is the formula for Volume?

Mass/density

12 protons and 13 neutrons

Mg-25

Predict the product(s) of this reaction (don't worry about balancing): Mg + HCl →

MgCl2 + H2

What is the name for NI3?

Nitrogen Triiodide

A tiny but very dense, positively charged portion of the atom that holds most of the atomic mass

Nucleus

What do silver, platinum, and gold have in common?

They react very easily.

Unlike Ionic compounds, Covalent compounds require what when naming them?

a prefix

A set of data are not close to each other, but the average of the data is very close to the actual value. This set of data can be described as...

accurate

What state of matter has molecules spaced apart from one another and changes its shape depending on its container?

liquid

Name the following ionic compound: MgSO4

magnesium sulfate

The amount of matter something contains is its ______________.

mass

What two types of measurements make up DENSITY?

mass and volume

What is the formula for density?

mass/volume

Anything that has weight and takes up space is called

matter

When two or more things are mixed together and you can see the different parts or could easily take it apart, it is called a _______________.

mixture

When two or more atoms come together, they form a what?

molecule

Electrons have this charge -

negative

An atom's overall charge is ________.

neutral


Related study sets

ARTTest# i don't even know anymore this is so hard

View Set

Exam 1 Human Development 6931 - USF

View Set

Adult 1 Unit 6: Chapter 64 Practice Questions

View Set

Human Lifespan Development Exam 2 (Ch, 6-10)

View Set