A scientific model is a specific set of steps that a scientist follows to reach a conclusion

Mass is defined as anything that can be observed

a substance is mattered that has a definite composition

The steps of the scientific method must be followed in order every time an experiment is carried out

A sample’s color is a qualitative measurement

Qualitative measurements involve numerical measurements while quantitative measurements record descriptions

The goal of all experiments is to prove the hypothesis correct

The conditions of an experiment that do not vary from sample to sample are called controls

Safe laboratory practices should be followed by all chemists and other scientists

And object has the same weight regardless of its location on earth

A control is the part of the experiment that the other results will be compared to

Chemistry is the study of matter and the changes it undergoes

Contact lenses should be worn instead of glasses so that your glasses do not get scratched

If the temperature of water increases as you heat it the temperature is the independent variable

The volume of a balloon increases as it is heated. the volume of the balloon is the dependent variable

Ozone is a chemical produced in the atmosphere that is harmful to living organisms

Chlorofluorocarbons are made in the atmosphere by the reaction of Ozone with ultraviolet light

When conducting an experiment you should only manipulate one variable at a time

If an accidental discovery is made it means something went wrong with the experiment and the results should be discarded

If you wear glasses already you do not need to wear safety goggles

The ozone layer is mostly located in the stratosphere

Chlorofluorocarbons do not pose a threat to the environment because they are stable

The mass of an astronaut remains the same on earth and the moon

in systematic steps of approach used in a scientific study a scientific law comes after a hypothesis

If the distance covered by a car at constant speed varies for different intervals of time then distance is a dependent variable

Molina and Rowland hypothesized that CFCs in the atmosphere are depleting the ozone layer. Their work is categorized as an applied research

It is advisable to wear contact lenses while working in a chemistry lab

While preparing an acid solution always add water to the acid

Earth attracts all objects to its surface due to gravity. This is a hypothesis

A base unit is made up of several other units combined together

The prefix for one millionth is micro

When moving from a small unit to a larger unit the numerical value will increase

A best fit line connects all of the data points in a line graph

If the slope of a best fit line is negative the dependent variable tends to decrease as the independent variable increases

A circle graph is most commonly used when the data is in the form of percentages

In most line graphs the dependent variable is placed along the X axis

In determining the percent error only the size of the difference matters, not whether the measured value is above or below the excepted value

A measurement of 5.685×10 to the -6 is equivalent to .0000005685

Solids can be recognized because they are hard and rigid

A solid cannot be compressed because its particles are tightly packed

The terms gas and vapor can be used interchangeably

And intensive physical property is one that depends on the amount of matter present

A change in state of matter is a physical change

A change of state is a chemical change because ice and water do not resemble one another

When a chemical change occurs the products have a greater mass than the reactants

Compounds can be separated into their component elements by a series of physical changes

The properties of a compound are the same as the properties of the element that is present in the largest proportion of the compound

Mixtures can be separated by a series of physical changes

Crystallization is a separation technique used to produce rock candy from a sugar solution

The periodic table organizes elements into a grid of vertical columns known as periods

Milk is a homogeneous mixture

Seawater is a substance

The magnetization of an iron rod is an example of a chemical change

A change in the color of tree leaves in the fall is an example of a physical change

Mendeleev’s original periodic table could accommodate elements that did not even exist

Which is the part of an experiment that serves as the point of comparison for the results

Which precaution should you take when you see this symbol

Which precaution should you take when you see this symbol

Which precaution should you take when you see this safety symbol

Which precaution should you take when you see this safety symbol

Which precaution should you take when you see this safety symbol

Which is a qualitative measurement

Which is a quantitative measurement

If three solid blocks are made of the same material and have the exact same dimensions which block has the greatest mass

Which describes what happens when you fly 10 km above Earth’s surface

Which is not a harmful result of UVB exposure

Which is true of the earths atmosphere

Which is the part of the experiment that is the measurable outcome

Which is the part of the experiment that the researcher manipulates

Which of the following appliances increase CFCs in the atmosphere

Which of the following properties of matter can be explained on a submicroscopic level

Earth attracts all objects to its surface. This statement is a(n)

In the atmosphere, which reacts with free chlorine atoms

Contrast a molecule of oxygen with a molecule of Ozone

Which layer of the atmosphere contains most of the earths atmospheric Ozone

What do scientists call a summary of accepted facts of nature

Which of the following series of scientific steps is most likely in the correct order

Which term is used for the measurement of the average kinetic energy of the particles of a substance

Which unit is determined by the frequency of the radiation given off by Cesium-133

Which is not an appropriate unit for measuring density

Which term describes the amount of mass contained per unit of volume

Which value has only four significant digits

The excepted value for a quantity is 5.67 g. If the measured value is 5.89 g what is the percent error

Which is the correct value for the prefix deci

Which is the value associated with the prefix nano

Which is the correct conversion for a temperature of 67.3°C

Which is the sum of these values, to the appropriate number of significant digits? 17.358+3.502+20.14

Which is the product of these numbers, to the appropriate number of significant digits? 56.2×9.2057

How many significant digits are in the value 530,405,000

How many significant digits are in the value 0.0050340

A bottle contains 3.100 mL of a liquid. The total mass of the bottle and the liquid together is 6.300 g. The mass of the empty bottle is 4.240 g. What is the density of the liquid

What is the distance that light travels through a vacuum in 1/299,792,458 of a second

According to rounding rules for addition, the sum of 27.1, 34.538, and 37. 68 is

The product of 2×10^4 cm and 4×10^-12cm expressed in scientific notation is

Which of the following quantities is incorrectly matched with its SI base unit

A meniscus must be considered when making which of the following measurements

Which is the state of matter that has a definite shape and definite volume

Which is the state of matter that has an indefinite shape and definite volume

Which is the state of matter that has an indefinite shape and indefinite volume

Which is an extensive physical property

Which is an intensive physical property

What is the change of state in which a solid becomes a liquid

What is the change of state in which a gas becomes a liquid