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3 years ago

Animals adapted for lack of water and extremes in temperature are found in which biome?

Chemistry

2 answers:

nika2105 [10]3 years ago

8 0

The desert because there is a huge lack of water and very extreme temperatures of heat.

Arturiano [62]3 years ago

7 0

Answer:

Tundra.

Explanation:

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Which of these equations is balanced?

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It looks like A is balanced

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3 years ago

Which particles in atoms have a negative electric charge?

Verdich [7]

Answer:

Electrons

Explanation:

Atoms both have negative and positive particles

Protons are positive

Electrons are negative

Neutrons are neutral

Nuclei is where you find both neutrons and protons in an atom

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3 years ago

When electrons have moved from one element to another, what type of bond has formed?

aliya0001 [1]

A covenant bond is formed when electrons move from one element to another.

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3 years ago

1. (a) What are the possible interactions between two charged objects?

lord [1]

Answer:

the attractive force between two objects with opposite charges, two objects that are of like charge will repel each other. That is, a positively charged object will exert a repulsive force upon a second positively charged object.

Explanation:

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4 years ago

Gold has an atomic weight of 196.97 g/mol, and a density of 19.3 g/cm3. Approximately how many atoms are in a spherical gold nan

ale4655 [162]

Answer: The number of atoms in spherical gold nano particle are $26.918\times 10^4$

Explanation:

To calculate the volume of sphere, we use the equation:

$V=\frac{4}{3}\pi r^3$

where,

r = radius of the sphere = $10nm=10^{-6}cm$ (Conversion factor: $1nm=10^{-7}cm$ )

Putting values in above equation, we get:

$V=\frac{4}{3}\times 3.14\times (10^{-6})^3\\\\V=4.19\times 10^{-18}cm^3$

To calculate mass of of the substance, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

Volume of gold = $4.19\times 10^{-18}cm^3$

Density of gold = $19.3g/cm^3$

Putting values in above equation, we get:

$19.3g/cm^3=\frac{\text{Mass of gold}}{4.19\times 10^{-18}}\\\\\text{Mass of gold}=8.0867\times 10^{-17}g$

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Mass of gold = $8.8067\times 10^{-17}g$

Molar mass of gold = 196.97 g/mol

Putting values in above equation, we get:

$\text{Moles of gold}=\frac{8.8067\times 10^{-17}g}{196.97g/mol}=4.47\times 10^{-9}moles$

According to mole concept:

1 mole of an element contains $6.022\time 10^{23}$ number of atom

So, $4.47\times 10^{-19}$ moles of gold will contain = $4.47\times 10^{-19}\times 6.022\times 10^{23}=26.918\times 10^4$ number of atoms.

Hence, the number of atoms in spherical gold nano particle are $26.918\times 10^4$

8 0

3 years ago