How do catalysts affect a chemical reaction?(1 point)

Responses

provide activation energy

increase activation energy

lose activation energy

lower activation energy

51 answers

lower activation energy
What happens during rusting of an iron nail?(1 point)
Responses

Sulfur, iron, and oxygen combine to form iron sulfoxide.

Iron and sulfur combine to form iron sulfide.

Iron and oxygen combine to form iron oxide.

Sulfur and oxygen combine to form a sulfur dioxide coating.
Iron and oxygen combine to form iron oxide.
What does the forward arrow in a chemical equation mean?(1 point)
Responses

The reaction yields something.

The reaction proceeds quickly.

The reaction is reversible.

The reaction proceeds slowly.
The reaction is reversible.
Which kind of reaction is photosynthesis?(1 point)
Responses

light-independent

endothermic

temperature-independent

exothermic
endothermic
Photosynthesis requires which kind of energy?(1 point)
Responses

thermal energy

mechanical energy

light energy

heat energy
light energy
How do you show the group of digits that repeat in a repeating decimal?(1 point)
Responses

by putting a bar over them

by printing them in italics

by underlining them

by putting them in parentheses
by putting a bar over them
How many digits long could the repeating cycle of a repeating decimal be if the denominator of the rational number is 7?(1 point)
Responses

any finite length

up to six digits long

up to seven digits long

infinitely long
up to six digits long
Convert 0.27
to a rational number in simplest form.(1 point)
Responses

27/100

1/27

3/11

27/99
27/100
To convert 0.264 to a rational number, you would set x equal to 0.264 and then multiply both sides of the equation by what number?(1 point)
Responses

10

100

1,000
1,000
If a repeating decimal has a repeating cycle of three digits, it will convert to a rational number with what denominator? (1 point)
Responses

100

99

1,000

999
999
How many digits are in the repeating cycle of 17/27
The repeating cycle of 17/27 is 1 digit long.
What are the three main operating systems?

(1 point)
Responses

Chrome, Firefox, and Bing

Amazon, Facebook, and Apple

Microsoft, Google, and Adobe

Windows, macOS, and Linux
Windows, macOS, and Linux
Carla wants to learn more about how CPUs work. Which of these videos would be the MOST useful to her?

(1 point)
Responses

“How Input Devices Work”

“Storage Devices for Beginners”

“Computer Output Devices 101”

“Introduction to Computer Processing”
“Introduction to Computer Processing”
Which of these is an example of an input device?

(1 point)
Responses

a mouse

a screen

a printer

a 3-D printer
a mouse
Which part of the computing process occurs before storage is used?

(1 point)
Responses

input

networking

output

updating
input
What is the main difference between the earliest computers and modern computers?

(1 point)
Responses

Early computers didn’t use electricity.

Early computers were very slow.

Modern computers don’t use electricity.

Modern computers are physically larger.
Modern computers are physically larger.
Which of the following statements BEST describes a computer?

(1 point)
Responses

It is a thinking machine.

It is a mathematical machine.

It is a mechanical converter.

It is a quantum technology.
It is a mathematical machine.
Which statement is MOST accurate?

(1 point)
Responses

Faster memory is more expensive.

All kinds of memory cost the same.

Slower memory is easier to find.

In the cloud, memory is free.
Faster memory is more expensive.
Which of these is faster than RAM?

(1 point)
Responses

file paths

L caches

input devices

cloud memory
L caches
What is the MAIN advantage of solid-state drives?

(1 point)
Responses

They are very easy to fix.

They are very affordable.

They are very fast.

They are very secure.
They are very fast.
Which of these BEST describes a built-in solid-state drive?

(1 point)
Responses

an input device

an output device

a storage device

a processing device
a storage device
What is a computer’s primary memory MOSTLY used for?

(1 point)
Responses

communicating with peripherals

loading the operating system

providing short-term storage

managing the solid-state drive
providing short-term storage
Which of these is an output device?

(1 point)
Responses

a 3-D printer

a keyboard

a mouse

a camera
a 3-D printer
Which computing component is responsible for coordinating memory management?

(1 point)
Responses

the hardware

the operating system

the applications

the user
the operating system
What is the MAIN advantage of a hard drive?

(1 point)
Responses

It offers the fastest way to access data.

It doesn’t require magnetization.

It is the most secure storage method.

It is very affordable.
It is very affordable.
What is the difference between hardware and software?

(1 point)
Responses

Software is physical; hardware is not.

Hardware is physical; software is not.

Software is open-source; hardware requires a license.

Hardware is open-source; software requires a license.
Hardware is physical; software is not.
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