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3 years ago

Please help. Thank you:)

Chemistry

1 answer:

bearhunter [10]3 years ago

5 0

These are guesses because there is no word bank or anything

A. Water
B. Housing
C. Plants
D. Animals
E. Warmth

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When a glow stick is crushed and shaken, the two liquids mix and the stick glows.

Mars2501 [29]

Answer:

A chemical change has occurred, with energy being given off.

Explanation:

The liquids mix and the stick gives off energy in light form

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3 years ago

helium-filled balloon at sea level has a volume of 2.1 L at 0.998 atm and 36°C. If it is released and rises to an elevation at w

elena55 [62]

the new volume of the balloon would be 2.3 L

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3 years ago

The word eclipse most closely means to

Gennadij [26K]

Answer:

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3 years ago

A 0.4272 g sample of an element contains 2.241 x 10 ^21 atoms . what is the symbol of the element?

grin007 [14]

Answer:

Likely $\rm In$ (indium.)

Explanation:

Number of atoms: $N = 2.241 \times 10^{21}$ .

Dividing, $N$ , the number of atoms by the Avogadro constant, $N_A \approx 6.023 \times 10^{23} \; \rm mol^{-1}$ , would give the number of moles of atoms in this sample:

$\begin{aligned} n &= \frac{N}{N_{A}} \\ &\approx \frac{2.241 \times 10^{21}}{6.023 \times 10^{23}\; \rm mol^{-1}} \approx 3.72 \times 10^{-3}\; \rm mol \end{aligned}$ .

The mass of that many atom is $m = 0.4272\; \rm g$ . Estimate the average mass of one mole of atoms in this sample:

$\begin{aligned}M &= \frac{m}{n} \\ &\approx \frac{0.4272\; \rm g}{3.72 \times 10^{-3}\; \rm mol} \approx 114.82\; \rm g \cdot mol^{-1}\end{aligned}$ .

The average mass of one mole of atoms of an element ( $114.82\; \rm g \cdot mol^{-1}$ in this example) is numerically equal to the average atomic mass of that element. Refer to a modern periodic table and look for the element with average atomic mass $114.82$ . Indium, $\rm In$ , is the closest match.

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3 years ago

Ello! lovely jewels ~ please help me with these questions ฅ^•ﻌ•^ฅ Thanks in advance

QveST [7]

Answer:

<h2>#1</h2><h3>Which process is used for preparation of Sodium Carbonate? </h3>

<h2>Solvey process</h2><h3>is used for the preparation of Sodium Carbonate.</h3>

<h2>#2</h2><h3>How many water of crystallisation are there in Washing Soda?</h3>

<h2>Ten Molecules.</h2><h3>As Washing Soda has formula NaCO3.10H2O . So it has ten molecules of water crystallisation.</h3>

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2 years ago