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yKpoI14uk [10]
4 years ago
6

This is anything with mass that occupies space.

Chemistry
2 answers:
FromTheMoon [43]4 years ago
5 0
the answer is matter
Leno4ka [110]4 years ago
5 0

The answer is matter because it takes up space

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A student does not observe a change when holding a test tube in a flame. However, a change is expected. What is the most likely
dalvyx [7]

The answer is: The reactants were not heated long enough.

For all chemical reaction some energy is required and that energy is called activation energy (energy that needs to be absorbed for a chemical reaction to start).

Activation energy is the minimum energy colliding particles must have in order to react.

By lowering activation energy, reaction need less heat.

In this example, there is not enough heat.

3 0
3 years ago
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What is the number of kilograms of solvent in a 0.70 molal solution containing 5.0 grams of solute?
Leya [2.2K]
Molar mass of solute is 30 g/mol 
molality is defined as the number of moles of solute in 1 kg of solvent 
number of moles of solute - 5.0 g / 30 g/mol = 0.17 mol
molality of solution is 0.70 mol/kg
the mass of solvent when there are 0.7 mol of solute - 1 kg
then the mass of solvent when there's 0.17 mol of solute - 0.17 mol / 0.7 mol/kg
= 0.242 kg
therefore mass of solvent is 0.242 kg
3 0
4 years ago
All of the atoms of argon have the same
Ira Lisetskai [31]

The answer is same atomic number!

3 0
4 years ago
Anthracene is a yellow, crystalline solid found in coal tar. complete this structure for anthracene, c14h10, by adding bonds and
Assoli18 [71]

Anthracene is a polycyclic aromatic hydrocarbon with chemical formula C₁₄H₁₀. The number of fused rings in Anthracene are three in number. This compound is colorful and is used in the formation of different dyes due to its property of deloclization of pi electrons. All the carbon atoms in Anthracene are sp² hybridized with a trigonal planar structure hence, the Anthracene is planar in nature.

Number of Sigma Bonds:

                                         There are 26 sigma bonds (colored in Blue) in Anthracene among which 10 sigma bonds are between carbon and hydrogen atoms while the remaining are between the carbon atoms.

Number of Pi-Bonds:

                                  There are 7 pi bonds in Anthracene (colored in red). All pi bonds are present between carbon and carbon atoms.

Number of Electrons in Sigma Bonds:

                                                             As one sigma bond is formed by 2 electrons hence, 26 sigma bonds will be formed by 52 electrons.

Number of Electrons in Pi Bonds:

                                                       As one pi bond is formed by the side wise overlap of two p orbitals hence one pi bond is formed by two electrons so, 7 pi bonds will be formed by 14 electrons.

7 0
3 years ago
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1. How is the density of a substance calculated? 2. If the shape of an object is irregular, like a stone, how can you measure it
andriy [413]
1. Density is calculated by dividing the object's mass by the volume it occupies. 
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Substituting the known values,
                 D = 10.0 g / 15.625 cm³ = 0.64 g/cm³
5 0
3 years ago
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