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3 years ago

7

Chemistry

1 answer:

DanielleElmas [232]3 years ago

6 0

Answer:

D. The discovery of new evidence.

D is correct because it's the only one that would give proof and science relies on proof.

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Foods that are basic can be identified by what taste

xz_007 [3.2K]

Answer:

Foods that are basic can be identified by its bitter taste. Option C

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3 years ago

How much heat (in kJ) would need to be removed to cool 150.3 g of water from 25.60°C to -10.70°C?

olga_2 [115]

Answer:

Q = -22.9 kJ

Explanation:

Given that,

Mass of water, m = 150.3 g

Water gets cool from 25.60°C to -10.70°C.

The specific heat of water, c = 4.2 J/g°C

The formula for heat needed is given by :

$Q=mc\Delta T\\\\Q=150.3\times 4.2 \times (-10.7-25.6)\\\\Q=-22914.738\\\\or\\\\Q=22.9\ kJ$

So, 22.9 kJ of heat is needed to be removed to cool.

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3 years ago

Balancing word equation can someone help me 7 to 12

GuDViN [60]

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3 years ago

What is the percent composition of hydrogen in a compound if the mass of the initial compound is 276 gram and the mass of collec

mariarad [96]

Answer: The percentage composition of hydrogen in the given compound is 15%.

Explanation:

To calculate the percentage composition of hydrogen in a compound, we use the formula:

$\%\text{ composition of hydrogen}=\frac{\text{Mass of hydrogen}}{\text{Mass of compound}}\times 100$

Where,

Mass of hydrogen = 41.4 grams

Mass of compound = 276 grams

Putting values in above equation, we get:

$\%\text{ composition of hydrogen}=\frac{41.4g}{276}{\times 100$

Percentage composition of hydrogen in a given compound = 15%

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3 years ago

What is the simplest whole number ratio of atoms in a molecule or formula unit called?

astra-53 [7]

The empirical formula

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3 years ago