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3 years ago

A mental weight has a mass of 1kg and a volume of 900cm3. what is density

Chemistry

1 answer:

Art [367]3 years ago

6 0

The answer is 0.12 kg/m^3

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3 years ago

The outermost shell of an atom in known as ??

melisa1 [442]

Answer:

The answer is valance shell.

Valance shell is the outermost shell of an atom which contains valance electrons on it of an atom of an elements. 

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3 years ago

Data for the decomposition of hydrogen peroxide at some set temperature T is provided below. The rate law depends only on the co

Viktor [21]

Answer:

$0.00442 s^{-1}$ is the value of the rate constant.

Explanation:

$2 H_2O_2\rightarrow 2 H_2O + O_2$

Let the order of the reaction be x.

The rate law of the reaction can be written as:

$R=k[H_2O_2]^x$

1. Rate of the reaction when concentration changes from 0.882 M to 0.697 M in 0 seconds to 60 seconds.

$R=-\frac{0.697 M-0.882 M}{60 s-0 s}=0.00308 M/s$

$0.00308 M/s=k[0.697 M]^x$ ..[1]

2. Rate of the reaction when concentration changes from 0.697 M to 0.566 M in 240 seconds to 360 seconds.

$R=-\frac{0.236M-0.372M}{120s-60 s}=0.00227 M/s$

$0.00218 M/s=k[0.236 M]^x$ ..[2]

[1] ÷ [2]

$\frac{0.00308 M/s}{0.00227 M/s}=\frac{k[0.697 M]^x}{k[0.236M]^x}$

Solving fro x:

x = 0.92 ≈ 1

$R=k[H_2O_2]^1$

$0.00308 M/s=k[0.697 M]^1$

$k=\frac{0.00308 M/s}{[0.697 M]^1}=0.00442 s^{-1}$

$0.00442 s^{-1}$ is the value of the rate constant.

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4 years ago

What Element is named for the inventor of dynamite

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Nobelium discovered in Berkeley California

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3 years ago

Will mark brainliest

leonid [27]

Answer:

1. Calcium and fluorine

Symbol Ca F

Charges +2 1−

Formula CaF

2. Hydrogen and sulphur

Symbol H S

Charges 1+ 2−

Formula H

3. Nitrogen and hydrogen

Symbol N H

Charges 3− 1+

Formula NH

4. Carbon and chlorine

Symbol C Cl

Charges 4+ 1−

Formula CCl

5. Sodium and oxygen

Symbol Na O

Charges 1+ 2−

Formula Na

6. Carbon and oxygen.

Symbol C O

Charges 4+ 2−

i. e.

Formula CO

Explanation:

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6 0

3 years ago

A mental weight has a mass of 1kg and a volume of 900cm3. what is density​

A mental weight has a mass of 1kg and a volume of 900cm3. what is density