Lab Safety
Properties of matter
Percent Error
Label properties of matter
Calculating Density,mass and volume mixtures
100

What are key lab safety procedures 

Wearing protective equipment, dispose chemicals properly, keep a clean woke area

100

What property of matter describes its resistance to flow 

Viscosity 

100

How do you solve percentage error 

The absolute value of the difference of the measured value and the actual value divided by the actual value and multiplied by 100

100

What type of matter is a food product label

PET film, vinyl, polypropylene, acrylic 

100

What tools are used to measure mass

Balances, scales, and mass spectrometer

200

What should you do before starting any experiment 

Clean the work area, tie hair up, wear goggles 

200

How does the density of a substance relate to its buoyancy in a liquid 

The density of a substance determines its buoyancy in a liquid. If the density of the substance is greater than that of liquid, it will sink. Conversely, if the density of the substance is less than that of liquid it will float

200

How do you calculate the percent error 

Percent error= (Estimated number-Actual number)/Actual number)x100

200

What other substances, in addition to water, can exist naturally on earth in at least three states of matter

Mercury and water

200

What unites are used to measure mass

Grams and kilograms

300

What should you do if you spill a chemical on your skin in the lab 

Immediately rinse the affected area with water for at least 15 minutes and notify your instructor or supervisor 

300

How does the density of a substance change with temperature 

Generally, as temperature increase, the density of a substance decreases because the molecules move faster and occupy a larger volume resulting in decreased density. Conversely as temperature decreases the density of a substance increases as molecules move slower and occur a small we volume, leading to increased density 

300

A student measures the density of a substance in a lab experiment and obtains a value of 8.5 g/mL. The accepted value for the density of the substance is 9.0 g/mL. Calculate the percent error of the percent measurement 

Percent error=5.56%

300

What substance can exist naturally in two different states 

Liquid and solid 

300
what is the definition of volume?

The amount of space occupied by any three- dimensional solid 

400

Why is it important to properly label chemical containers in a laboratory 

It reduces the risk of accidents or mishaps

400

What changes do heating and cooling cause?

Chemical changes in which atoms alter their bonding to form a new substance 

400

Explain how to calculate percent error in an experiment, and why it’s important to consider in scientific analysis 

Percent error is calculated by taking the absolute value of the difference between the experimental value and the accepted value, dividing it by the accepted value and Then multiplying by 100. It’s important in scientific analysis Because it helps assess the accuracy of experimental results by quantifying the deviation from the true or accepted value. This allows researches to identify and correct sources of error. 

400

What properties can be used to identify matter?

density, colour, mass, volume, length, etc

400

What tools are used to measure volume

Beakers, burettes, pipettes, etc

500

Describe the hierarchy of controls in laboratory safety and provide an example of each 

Describe the hierarchy of controls in laboratory safety consists of elimination, substitution, engineering and personal protective equipment

500

How can materials be alike and different 

All materials are made up of atoms or combination of same or different atoms 

500

A student conducts an experiment to measure the density of a substance and obtains a value of 8.5g/cm^3. The accepted value from a reliable source is 8.0g/cm^3

Percent error= 0.5/8.0x100%=6.25%

500

Liquids Are easy to compress (T OR F)?

True

500

What units are used to measure volume

Liters, milliters,and cubic meters(m^3)

M
e
n
u