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3 years ago

What is this number in standard notation, 8.2x10^2

Chemistry

1 answer:

Ne4ueva [31]3 years ago

3 0

Either 8.2 x 10^5 or 820,000

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The law of constant composition states: All atoms of a given element have a constant composition and are different than atoms of

Airida [17]

Answer:

Explanation:

The law proves C. For examples no matter how water you have it will always have a 1:2 ratio of oxygen to hydrogen. :)

7 0

2 years ago

I need it done asap as fast as possible

Lubov Fominskaja [6]

Answer:

1. B

2. D. the form of a substance changes but not its identity

3. C

4. D

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2 years ago

A rectangular solid is 2.3 cm wide, 12.2 mm long and 0.75 inch thick. What is the volume of the piece?

Step2247 [10]

V=abc

a = 2,3cm
b=12,2mm = 1,22cm
c = 0,75inch = 1,905cm

V = 2,3cm*1,22cm*1,905cm ≈ 5,35cm³

5 0

3 years ago

How many milliliters of 2.19 M H2SO4 are required to react with 4.75 g of solid containing 21.6 wt% Ba(NO3)2 if the reaction is

Setler [38]

Answer:

1.7927 mL

Explanation:

The mass of solid taken = 4.75 g

This solid contains 21.6 wt% $Ba(NO_3)_2$ , thus,

Mass of $Ba(NO_3)_2$ = $\frac {21.6}{100}\times 4.75\ g$ = 1.026 g

Molar mass of $Ba(NO_3)_2$ = 261.337 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$Moles= \frac{1.026\ g}{261.337\ g/mol}$

$Moles= 0.003926\ mol$

Considering the reaction as:

$Ba(NO_3)_2+H_2SO_4\rightarrow BaSO_4+2HNO_3$

1 moles of $Ba(NO_3)_2$ react with 1 mole of $H_2SO_4$

Thus,

0.003926 mole of $Ba(NO_3)_2$ react with 0.003926 mole of $H_2SO_4$

Moles of $H_2SO_4$ = 0.003926 mole

Also, considering:

$Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}$

Molarity = 2.19 M

So,

$2.19=\frac{0.003926}{Volume\ of\ the\ solution(L)}$

Volume = 0.0017927 L

Also, 1 L = 1000 mL

<u>So, volume = 1.7927 mL</u>

5 0

3 years ago

Matter can undergo chemical reactions and nuclear reactions. Which statement is true only for nuclear reactions?

Irina18 [472]

Answer:

B - The energy of reactants is conserved.

D - the nuclei of atoms changes completely ( if that's the option)

6 0

1 year ago