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BaLLatris [955]
3 years ago
5

Which of the following is an example of a compound? CaCl2 Na Nd Cu

Chemistry
1 answer:
madam [21]3 years ago
5 0
CaCl2

All of the other choices are elements
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When a person looks at a bright light, tiny muscles in the eye contract so less light can enter the eye.
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involuntary, attached to the eyeball, nonstriated.

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A directory of relatives' phone numbers

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Which of the following represents a decomposition reaction? A. AC + B → AB + C B. A + B + C → ABC C. ABC → A + B + C D. AB + CD
Kryger [21]

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C

Explanation:ABC is being broken down into A, B, C

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3 years ago
A gallon of water has a mass of 3.79 kg. how many moles of water (18.02 g/mol) is this?
garik1379 [7]
First, we will convert the mass of the gallon to grams:
a gallon of water has a mass of 3.79 * 1000 = 3790 grams of water

number of moles can be calculated using the following rule:
number of moles = mass / molar mass
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number of moles = 3790 / 18.02 = 210.32 moles
3 0
3 years ago
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A single penny is 1.52 mm thick. The distance to the next nearest star other than our own (Alpha Centauri) is 4.22 light-years.
crimeas [40]

Answer:

2.29 × 10⁴ times

Explanation:

A single penny is 1.52 mm thick. The distance covered by 1 mole of pennies (6.02 × 10²³ pennies) is:

6.02 × 10²³ p × (1.52 mm/1 p) = 9.15 × 10²³ mm = 9.15 × 10²³ × 10⁻³ m = 9.15 × 10²⁰ m

The distance to the next nearest star other than our own (Alpha Centauri) is 4.22 light-years. Considering 1 ly = 9.46 × 10¹⁵ m, this distance in meters is:

4.22 ly × (9.46 × 10¹⁵ m/1 ly) = 3.99 × 10¹⁶ m

The times that the stack would go between the earth and Alpha Centauri are:

9.15 × 10²⁰ m / 3.99 × 10¹⁶ m = 2.29 × 10⁴

8 0
2 years ago
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