Separation Of Mixtures

Leslie incorrectly balances an equation as 2C4H10 + 12O2 → 8CO2 + 10H2O. Which coefficient should she change? 2 8 10 12

12

Linh is analyzing a solution in a crime lab. He needs to determine what liquid was used to dissolve the other substances. Which method would best complete the task? evaporation filtration decantation distillation

distillation

Which separation method would be most successful in separating the components of a homogeneous mixture? screening evaporation centrifugation magnetic separation

evaporation

Which method of separating a mixture involves passing a heterogeneous mixture through several layers of different materials? filtration decantation evaporation distillation

filtration

How many chlorine atoms are on the products side of the reaction 2Al + 6HCl → 2AlCl3 + 3H2? 2 3 6 9

6

Which is the correctly balanced equation for the reaction of rust, Fe2O3, and hydrochloric acid, HCl? Fe2O3 + HCl → FeCl3 + H2O Fe2O3 +3 HCl → 2 FeCl3 + H2O Fe2O3 + 6 HCl → 2 FeCl3 + 3 H2O Fe2O3 + 3 HCl → 2 FeCl3 + 3 H2O

Fe2O3 + 6 HCl → 2 FeCl3 + 3 H2O

Maria works in a hardware store. A bin of aluminum nails and a bin of iron nails are knocked over, and the nails get mixed up. Both sets of nails are the same color and size. What makes separating the nails a fairly easy job? Aluminum is heavier and iron is lighter. Iron settles in water, while aluminum floats. Aluminum is magnetic, and iron is non-magnetic. Iron is magnetic, and aluminum is non-magnetic.

Iron is magnetic, and aluminum is non-magnetic.

Suzanne watches a survival skills program on television. She makes a sketch based on what she sees .Which label best describes the purpose of the device and how it works? It filters the cactus pieces from the water. It screens water out of the cactus pieces. It evaporates water out of the cactus pieces. It centrifuges the cactus pieces from the water.

It evaporates water out of the cactus pieces.

Maria examines a mixture that appears to be the same throughout. However, when she looks at a sample using a magnifying lens, she can see small droplets of liquid surrounded by another liquid. Which conclusion best fits her observations? The mixture is a solution because it has the same appearance throughout the sample. The mixture is a suspension because it is composed of two different-appearing substances. The mixture is a heterogeneous mixture because one liquid is dissolved in the other. The mixture is a colloid because two different substances can be seen in a small sample.

The mixture is a colloid because two different substances can be seen in a small sample.

What is the correct classification of a mixture in which both a solid and a liquid are visible? a homogeneous mixture and a solution a homogeneous mixture and a suspension a heterogeneous mixture and a solution a heterogeneous mixture and a suspension

a heterogeneous mixture and a suspension

Analyzing a blood sample usually involves which type of separation method? screening distillation centrifugation filtration

centrifugation

In which situation will screening be used to separate a mixture? if the mixture is a solid suspended in a gas if the components have different boiling points if the mixture is a solid dissolved in a liquid if the components have different colors

if the mixture is a solid suspended in a gas

Liquid 1 reacts with Liquid 2, producing a solid and a gas. Using this scenario, which supports the law of conservation of mass? mass of Liquid 1 + mass of solid = mass of Liquid 2 + mass of gas mass of Liquid 1 - mass of solid = mass of Liquid 2 - mass of gas mass of Liquid 1 - mass of Liquid 2 = mass of solid + mass of gas mass of Liquid 1 + mass of Liquid 2 = mass of solid + mass of gas

mass of Liquid 1 + mass of Liquid 2 = mass of solid + mass of gas

Which best represents the law of conservation of mass? mass of reactants > mass of products mass of reactants < mass of products mass of reactants = mass of products mass of reactants → mass of products

mass of reactants → mass of products

A company has a volume of contaminated water that needs to be separated through evaporation. What would allow the mixture to be separated in the shortest time? placing the water in a single deep pool in a shady spot placing the water in a single deep pool in a sunny spot placing the water in several shallow pools in a shady spot placing the water in several shallow pools in a sunny spot

placing the water in several shallow pools in a sunny spot

Which method is best for separating most of a solid from a gas quickly? distillation filtration screening evaporation

screening

Which mixture can be separated based on differences in particle size of the components? Check all that apply. sweetened tea cereal and milk carbonated drinks smoky air vinegar perfume

smoky air cereal and milk

Cecil writes the equation for the reaction of hydrogen and oxygen below. H2 + O2 → H2O Why does his teacher ask him to balance the equation by including the correct coefficients? to show that most molecules exist in pairs to show that most compounds exist in pairs to show that atoms are conserved in chemical reactions to show that atoms are created in chemical reactions

to show that atoms are conserved in chemical reactions

During which method of separation is one of the components of the mixture lost? distillation magnetic separation screening evaporation

distillation

Dominic made the table below to organize his notes about mixtures. What mistake did Dominic make? The title should read "Properties of Solutions" because some mixtures do not have all of the properties listed. There is a definite recipe to make each mixture, so the composition of a mixture is set. Although it is possible to have more than one state, it is also possible to have only one state. A single substance can be used to make a mixture if the substance is composed of more than one element.

Although it is possible to have more than one state, it is also possible to have only one state.

Why can evaporation be used to separate a mixture? Check all that apply. One or more components has a lower boiling point than the desired component. The desired component has a different density than the other components. The mixture is a solution that contains a substance that will crystallize out. The desired component has the smallest particles in the mixture. The desired component has a higher boiling point than the other components. Heat causes some of the components to change into a gas.

One or more components has a lower boiling point than the desired component. The mixture is a solution that contains a substance that will crystallize out. Heat causes some of the components to change into a gas.

What property allows salt to be collected from ocean water? Salt and water are in different physical states. Salt and water form a heterogeneous mixture. Salt has a higher boiling point than water. Salt has a higher density than water.

Salt has a higher boiling point than water.

While doing a distillation, Farha heats the mixture too fast, and the temperature rises too quickly. If the mixture is composed of two liquids, how will this likely affect the separation of the mixture? The liquids will be separated in reverse order. Both liquids will evaporate and escape into the air. The liquid with the lower density will be collected before the liquid with the higher density. Some liquid with the higher boiling point will be collected along with the liquid with the lower boiling point.

Some liquid with the higher boiling point will be collected along with the liquid with the lower boiling point.

Carlotta adds too much salt to her soup. She recalls that evaporation can be used to separate salt from salt water, so she plans to leave the soup on the stove on low heat until the soup is less salty. Which will most likely happen to her soup? The soup will become saltier because evaporation removes the water and leaves the salt behind. The procedure will make the soup less salty because the salt will evaporate and leave the pot. The saltiness of the soup will not change because both salt and water will evaporate. The heat will cause the soup to become more salty because more salt dissolves in hotter water.

The soup will become saltier because evaporation removes the water and leaves the salt behind.

Different periods in human history are named for the materials used to make tools. Dr. Franklin is searching through layers of soil, looking for tools made by humans. After screening the top layer of soil, he uses a magnet to help speed up the search. Which type of location is Dr. Franklin most likely searching? a cave from before the Stone Age a Stone Age cave a Bronze Age battle site an Iron Age farm

an Iron Age farm

A recipe gives the instructions below. After browning the meat, pour off the fat from the pan.To further reduce fat, use a strainer. What type of separation methods are described in the recipe? decantation and screening distillation and screening decantation and centrifugation distillation and filtration

decantation and screening