4 years ago

Which best describes an element?

Chemistry

2 answers:

Alenkasestr [34]4 years ago

7 0

What are the answer choices?

Doss [256]4 years ago

3 0

Answer:

A pure substance

Explanation:

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In which step of a four-stroke engine cycle does the car release CO2, H2O, and CO?

In-s [12.5K]

Answer:

$\boxed{\text{exhaust stroke}}$

Explanation:

The four strokes are

Intake: The mixture of air and fuel enters the cylinder.
Compression: The mixture is compressed by a factor of about 11.
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Exhaust: The combustion products are expelled from the cylinder.

$\text{The cylinder releases CO$_{2}$, CO, and H$_{2}$O during the }\boxed{\textbf{exhaust stroke}}$