3 years ago

True or False

Chemistry

1 answer:

Darina [25.2K]3 years ago

3 0

The answer would be true

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Which substance is a compound iron or nitrogen oxide

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Which of these events leaves small pieces of rocks in new places? (4 points)

icang [17]

A. deposition

this means that it was moved from one place to another and can be transported by ice, water, gravity, or wind.

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2 years ago

The density of methanol is 0.7918g/mL. Calculate the mass of 89.9mL of this liquid.

Novosadov [1.4K]

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3 years ago

Determine the mass in grams of 3.75 x 10^21 atoms of zinc. (the mass of one mole of zinc is 65.39 g)

Nastasia [14]

Answer: The mass in $3.75 \times 10^{21}$ atoms of zinc is 0.405 g.

Explanation:

Given: Atoms of zinc = $3.75 \times 10^{21}$

It is known that 1 mole of every substance contains $6.022 \times 10^{23}$ atoms. So, the number of moles in given number of atoms is as follows.

$Moles = \frac{3.75 \times 10^{21}}{6.022 \times 10^{23}}\\= 0.622 \times 10^{-2}\\= 0.0062 mol$

As moles is the mass of a substance divided by its molar mass. So, mass of zinc (molar mass = 65.39 g/mol) is calculated as follows.

$Moles = \frac{mass}{molar mass}\\0.0062 mol = \frac{mass}{65.39 g}\\mass = 0.405 g$

Thus, we can conclude that the mass in $3.75 \times 10^{21}$ atoms of zinc is 0.405 g.

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What is a Control trial

AleksandrR [38]

It is a trial aimed to reduce bias during an experiment. An example would be a sugar pill, something that has no real effect so that the results of the true trial can accurately be compared. Its like a control group.

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