Jose times how long sugar takes to dissolve in warm water. He conducts four trials of his experiment. What should he conclude from his data?Trial Time
1 30 seconds
2 32 seconds
3 10 seconds
4 29 seconds
Sugar does not dissolve in water.
The time recorded for Trial 3 may be inaccurate.
His experiment has very low precision.
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Answer:
His experiment has very low precision
Explanation:
Precision is how close the answers are together. The answers are increasing in time. So, this makes sence. None of the answers are similar to one another.
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7.2 x 1032 kg
2.7 x 108 kg
9.0 x 10-1 kg
7.2 x 10-16 kg
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energy given=8.1 x 10^16 joules
speed of light = 3.00 × 10^8 m/s
plug in the values we'll get mass=9.0 x 10-1 kg
Answer : The mass lost in this reaction will be,
Explanation :
According to the Einstein equation, the energy is equal to the product of mass and the square of the speed of light.
The mathematical expression is :
where,
E = energy released =
c = speed of light =
m = mass lost = ?
Now put all the given values in the above formula, we get the mass lost in the reaction.
Therefore, the mass lost in this reaction will be,
Answers
Here’s how you solve the problem.Calculate the volume of the unit cell.
If the length of an edge of the cell is a, then V = a³.
V = (385 × 10⁻¹² m)³ = 5.71 × 10⁻²⁹ m³Use the density to calculate the mass of the unit cell (The density of TlCl is the same, no matter what volume of TlCl we have).
Mass = 5.71 × 10⁻²⁹ m³ × (7.00 g/1 cm³) × (100 cm/1 m)³ = 3.99 × 10⁻²² gUse the molar mass to convert grams to moles.
3.99 × 10⁻²² g × (1 mol/239.8 g) = 1.67 × 10 ⁻²⁴ molUse Avogadro’s number to calculate the number of formula units.
1.67 × 10 ⁻²⁴ mol × (6.022 × 10²³ formula units/1 mol) = 1.00 formula units
Therefore, 1 unit cell of TlCl contains 1 formula unit.
Final answer:
To determine the formula units in a unit cell, understand the type of the unit cell structure (simple cubic, body-centred cubic, or face-centred cubic) and apply the appropriate calculation for that type.
Explanation:
To determine the number of formula units in a unit cell, one must first understand what these terms mean. A unit cell is the smallest repeating unit of a crystal lattice. There exist several different types that affect formula unit arrangement and quantity, including simple cubic, body-centred cubic, and face-centred cubic.
A crystal lattice is a three-dimensional framework of atoms, ions, or molecules arranged in a repeating pattern. The formula unit is the lowest whole-number ratio of ions represented in an ionic compound. In a simple cubic unit cell, there's one formula unit, in a body-centred cubic cell, there are two, and in a face-centred cubic cell, there are four.
For instance, if you are dealing with a simple cubic arrangement the unit cell is composed of 8 atoms forming the vertices and each one is shared amongst 8 neighbouring cells, you have (8 x 1/8 = 1) formula unit per cell. Similarly, in a body-centred cubic, there is 1 atom in the centre fully inside, and 8 on the corners shared with neighbouring cells, hence (1 + 8 x 1/8 = 2) formula units per unit cell.
Learn more about Unit Cells and Formula Units here:
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Electrons are distributed around the nucleus and occupy almost all the volume of the atom.
The nucleus is made of electrons and protons.
The nucleus is made of protons, electrons, and neutrons.
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The answer is (B) Electrons are distributed around the nucleus and occupy almost all the volume of the atom.
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Answer:
A. Solid
Explanation:
that is what creates a solid state. the particles are moving slowly enough (the matter is cold enough) that stable structures between them can be established. so, they get close together and create e.g. grids.
b) false
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