NEW
Font size
WorksheetsEOC Language Practice - (ACT Practice Test: Snowflakes)
Total questions: 15
Worksheet time: 8mins
Snowflakes form from tiny water droplets, following a specific process of chemical bonding as they freeze, which results in a six-sided figure.
NO CHANGE
form, from tiny, water droplets,
form from tiny, water, droplets
form, from tiny water droplets
The rare "triangular" snowflake, similarly, confounded scientists for years because it apparently defied the basic laws of chemistry.
NO CHANGE
for example,
additionally,
however,
The seemingly triangular shape of those snowflakes suggests that forming through a different process of chemical bonding.
NO CHANGE
the manner in which formation
which had formed
that they form
By re-creating snowflake formation, a discovery has revealed to scientists Kenneth Libbrecht and Hannah Arnold the cause of this apparent variation.
NO CHANGE
the discovery of the cause of this apparent variation has been made by scientists Kenneth Librecht and Hannah Arnold.
scientists Kenneth Libbrecht and Hannah Arnold have discovered the cause of this apparent variation.
the cause of this apparent variation has been discovered by scientists Kenneth Libbrecht and Hannah Arnold.
Snowflakes begin to form when water in the atmosphere freezes it causes the water molecules to bond into a hexagonal shape.
NO CHANGE
freezes, causing
freezes, it causes
freezes, this causes
During the flake's descent from Earth's upper atmosphere, other water vapor molecules bumps into the hexagonal structure.
NO CHANGE
has bumped
bumped
bump
Bypassing the liquid water phase, those molecules condense directly onto the established hexagonal pattern.
If the writer were to delete the underlined portion (adjusting the capitalization as needed), the sentence would primarily lose:
an explanation of the process water molecules undergo to change from liquid to vapor to solid.
a detail that mentions a step some water molecules skip in changing from vapor to solid.
a visual description of what water vapor molecules look like.
an explanation of how molecules react to various air temperatures.
In 2009, Libbrecht and Arnold's experiments revealed that triangular snowflakes begin with the same process of chemical boning and forms a hexagonal shape.
NO CHANGE
were they to form
if they formed
form
The triangular shape is an illusion resulting from one significant addition to the process dust.
NO CHANGE
process is
process:
process;
The greater the pressure from the wind, causes bonds to form quick at this edge than in the rest of the snowflake.
NO CHANGE
pressure from the wind, which
the pressure, as the wind
pressure from the wind
The greater the pressure from the wind, causes bonds to form quick at this edge than in the rest of the snowflake.
NO CHANGE
more quickly
most quickly
quickest
The resulting snowflake has three long sides and three sides that are so short they are difficult to detect. Although these snowflakes appear to have a triangular shape–they actually have a hexagonal pattern.
NO CHANGE
shape,
shape;
shape:
Such snowflakes offer evidence that even when impurities interfere, the basic laws of chemistry still apply.
Which choice most effectively concludes the sentence and the essay.
NO CHANGE
scientists can be certain that a solution to even the most confusing event will be found.
snowflakes will still fall if atmospheric conditions are favorable.
snowflakes come in many different shapes and sizes.
The writer is considering adding the following sentence to the essay:
This growth can take the form of either branching (which forms stable, symmetrical shapes) or faceting (which forms unstable, complex shapes).
If the writer were to add this sentence, it would most logically be placed at Point:
A in Paragraph 1.
B in Paragraph 1.
C in Paragraph 2.
D in Paragraph 4.
Suppose the writer's primary purpose had been to offer an example of a discovery that changed the way scientists viewed the basic laws of chemistry. Would this essay accomplish that purpose?
Yes, because it describes how the observation of triangular snowflakes has led scientists to discover that their understanding of the basic laws of chemistry is flawed.
Yes, because it describes how scientists have applied the knowledge they've gained through studying snowflakes to other areas of chemistry.
No, because it focuses on how scientists are struggling to determine how triangular snowflakes are formed.
No, because it explains that triangular snowflakes appeared to, but don't actually, violate the basic laws of chemistry.
