3 years ago

How can you make an observation?

Chemistry

1 answer:

ahrayia [7]3 years ago

6 0

Answer:

A is definitely one of them.

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What can cells create

liraira [26]

Cells are the basic structures of all living organisms. Cells provide structure for the body, take in nutrients from food and carry out important functions. Cells group together to form tissues, which in turn group together to form organs, such as the heart and brain.

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3 years ago

Table salt is considered a(n) ______________ because it conducts electricity in water. A) electrolyte B) electrolysis C) nonelec

kodGreya [7K]

A) electrolyte the others either describe a process, the opposite, or a whole different thing

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4 years ago

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Hypothesis 2 (Particle size): If you ___ the particle size of a reactant, then the reaction rate will increase because ___ of th

vfiekz [6]

Answer: decrease / more

Explanation:

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3 years ago

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The zinc within a copper-plated penny will dissolve in hydrochloric acid if the copper coating is filed down in several spots (s

Mrac [35]

Answer:

Mass of hydrogen gas evolved is 0.0749 grams.

Explanation:

Total pressure of the gases = p = 758 mmHg

Vapor pressure of water = 23.78 mmHg

Pressure of hydrogen gas ,P = p - 23.78 mmHg = 758 mmHg - 23.78 mmHg

P = 734.22 mmHg = $\frac{734.22}{760} atm=0.966 atm$

Temperature of of hydrogen gas ,T= 25°C =298.15 K

Volume of hydrogen gas = V = 0.949 L

Moles of hydrogen gas =n

PV = nRT (Ideal gas equation )

$n=\frac{PV}{RT}=\frac{0.966 atm\times 0.949 L}{0.0821 atm L/mol K\times 298.15 K}$

n = 0.03745 mol

Moles of hydrogen gas = 0.03745 mol

Mass of 0.03745 moles of hydrogen gas = 0.03745 mol × 2 g/mol = 0.0749 g

Mass of hydrogen gas evolved is 0.0749 grams.

3 0

4 years ago

A rock weighing 32.0 g is placed in a graduated cylinder displacing the volume from 12.3 mL to 16.8 mL. What is density of the r

Ierofanga [76]

Answer:
Density = 7.11 g.cm⁻³

Solution:

Density is given as,

Density = Mass / Volume --------- (1)

Data Given;
Mass = 32 g

Volume = 16.8 mL - 12.3 mL = 4.5 mL = 4.5 cm³

Putting values in equation 1,

Density = 32 g / 4.5 cm³

Density = 7.11 g.cm⁻³

8 0

3 years ago