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3 years ago

Salt dissolving in water is a physical change. (2 points) True False

Chemistry

1 answer:

nydimaria [60]3 years ago

5 0

Answer:

i believe its true

Explanation:

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Kara shines a blue light and a red light onto paper as shown in the figure below. If the paper is

boyakko [2]

Answer:D. neither red nor blue

Explanation:

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3 years ago

The thin outer layer of Earth, called the crust, contains only 0.50 percent of Earth's total mass and yet is the source of almos

Rzqust [24]

Answer:

The mass of silicon in kilograms in Earth's crust is $7.2729\times 10^{21} kg$ .

Explanation:

Mass of Earth = $5.9\times 10^{21} tons$

(1 ton= 2000 lb)

(1 lb =453.6 g)

1 ton = 2000 × 453.6 g =907,200 g

Mass of Earth = $5.9\times 10^{21}\times 907,200 g=5.3524\times 10^{27} g$

Percentage of earth crust = 0.50%

Mass of earth crust = M

$0.50\%=\frac{M}{5.3524\times 10^{27}}\times 100$

$M=2.6762\times 10^{25} g$

Percentage of the silicon in Earth's crust = 27.2 %

Mass of silicon in in Earth's crust = m

$Si\%=\frac{m}{M}\times 100$

$27.2\%=\frac{m}{2.6762\times 10^{25} g}\times 100$

$m = 7.2792\times 10^{24} g=7.2729\times 10^{21} kg$

1000 g = 1 kg

The mass of silicon in kilograms in Earth's crust is $7.2729\times 10^{21} kg$ .

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3 years ago

In addition to canyons,what other kinds of geologic formations might separate similar organisms

serg [7]

The people of Finland, who are secluded to some degree from the rest of the world by water, develop certain diseases due to the lack of genetic material from other ethnicities and races.

Physical barriers prevent fish from one stream from mating with fish from another stream, leading to a less varied gene pool among those fish. As time passes, the fish become unable to successfully mate with other groups.

A mountain range prevents two types of goat from mating, causing the gene pool to become less varied.<span>

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3 years ago

Which best describes nuclear fusion? O A nucleus spontaneously splits and absorbs energy O Two nuclei spontaneously combine and

KIM [24]

Answer: Nuclei combine to form a heavier nucleus, releasing energy. 

Explanation: e.g two deuterium nucleus (Hydrogen-2 isotopes) forms an He nucleus and energy is released.

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2 years ago

What is the molar mass of AgF. 51.9g/mol 198.8g/mol 126.87g/mol 99.7g/mol

lisov135 [29]

Just find Ag and F on periodic table, find g/mol for each one and add them together

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3 years ago