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3 years ago

I need help asap on this 25 min quiz

Chemistry

1 answer:

lyudmila [28]3 years ago

4 0

Answer:

D. It only exsists in liquid and solid form

Explanation:

this false bc water exsists in liquid, solid, AND gas form

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Calculate the average atomic mass of B. The isotopes and abundances are 10B, 19.80% and 11B, 80.20%. Round answer to 3 significa

timama [110]

Given,

The two isotopes of B are 10B and 11B

% abundance of 10B = 19.80

% abundance of 11B = 80.20

Average atomic mass of B

= $\frac{(mass of 10B)(abundance of 10B) + (mass of 11B)(abundance of 11B)}{100}$

= $\frac{(10)(19.80) + (11)(80.20)}{100}$

= $\frac{198 + 882.2}{100}$

= $\frac{1080.2}{100}$

= 10.802

Therefore, the average atomic mass of B is 10.802 u

8 0

4 years ago

Read 2 more answers

If you took a wire, connected one end to a rechargeable battery, and connected the other end to the leaf of a plant, would you b

astraxan [27]

Answer:

No bcz it is insulator it will not conduct electric

7 0

3 years ago

A laboratory analysis of a 100 g sample finds it is composed of 1.8 g hydrogen, 56.1 g sulfur, and 42.1 g oxygen. What is its em

Neporo4naja [7]

Answer: The empirical formula is $H_2S_2O_3$

Explanation:

If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mas of H = 1.8 g

Mass of S = 56.1 g

Mass of O = 42.1 g

Step 1 : convert given masses into moles.

Moles of H = $\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{1.8g}{1g/mole}=1.8moles$

Mass of S = $\frac{\text{ given mass of S}}{\text{ molar mass of S}}= \frac{56.1g}{32g/mole}=1.8moles$

Moles of O= $\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{42.1g}{16g/mole}=2.6moles$

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For H = $\frac{1.8}{1.8}=1$

For S = $\frac{1.8}{1.8}=1$

For O = $\frac{2.6}{1.8}=1.5$

Converting to whole number ratios

The ratio of H: S: O= 2: 2: 3

Hence the empirical formula is $H_2S_2O_3$

7 0

3 years ago

In a redox reaction, which particles are lost and gained in equal numbers

Anna35 [415]

In a redox reaction electrons are lost and gained in equal numbers. The species that is oxidized gives electrons to the species that is reduced. I hope this helps. Let me know if anything is unclear.

5 0

4 years ago

The cubic centimeter (cm' or cc) has the same volume as a

snow_lady [41]

The answer is B milliliter

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3 years ago