1. _______ are atoms that carry an electric charge.

Chemistry

2 answers:

alexgriva [62]3 years ago

8 0

Protons carry a positive charge. Neutrons carry no charge. Electrons carry a negative charge

horrorfan [7]3 years ago

6 0

Atoms that carry an electric charge because they gained or lost electrons are called ions.

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An object at a distance of 30 cm from a concave mirror gets its image at the same point. The focal length of the mirror is

Nimfa-mama [501]

The focal length of the mirror is 15 cm

From the question given above, the following data were obtained:

Object distance (u) = 30 cm

Image distance (v) = 30 cm

<h3>Focal length (f) =? </h3>

The focal length of the mirror can be obtained as follow:

$\frac{1}{f} = \frac{1}{v} + \frac{1}{u} \\\\\frac{1}{f} = \frac{1}{30} + \frac{1}{30}\\\\\frac{1}{f} = \frac{2}{30} \\\\\frac{1}{f} = \frac{1}{15} \\\\$

<h3>Invert </h3><h3>f = 15 cm</h3>

Therefore, the focal length of the mirror is 15 cm

Learn more: brainly.com/question/1392083

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<span>85% ethanol | 25% ethanol | 50% ethanol
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use x and y because you don;t know how much she needs.

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85% is 85/100 or 0.85, and you need that much of x, same goes for the 25% and 50% mixtures so now you can make up 2 equations
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so our values for x and y work
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