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3 years ago

2. What is an element?

Chemistry

2 answers:

olga55 [171]3 years ago

6 0

C because atoms is an element

yawa3891 [41]3 years ago

5 0

Answer: the answer is c i looked it up please give me brainliest pleaseeee

Explanation:

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Which planet is sometimes called Uranus’s twin? Saturn Pluto Jupiter Neptune

sattari [20]

Neptune.

Because the size, mass, composition and rotation of Neptune and Uranus are very similar they're sometimes refered to as planetary twins.

7 0

3 years ago

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How will it move ? quiz2 can yall help me with this quiz.

olga55 [171]

How will what move? What, exactly, are you asking?

3 0

3 years ago

Which has more atoms, 6.0 g of silicon (Si:28) or 6.0 of iron (Fe:56)?

vovangra [49]

Answer: 6.0 g of silicon has more atoms

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the moles, we use the equation:

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

a) $\text{Number of moles of silicon}=\frac{6.0g}{28g/mol}=0.21moles$

1 mole of Si contains = $6.023\times 10^{23}$ atoms

0.21 moles of Si contains = $\frac{6.023\times 10^{23}}{1}\times 0.21=1.26\times 10^{23}$ atoms

b) $\text{Number of moles of iron}=\frac{6.0g}{56g/mol}=0.11moles$

1 mole of Fe contains = $6.023\times 10^{23}$ atoms

0.11 moles of Fe contains = $\frac{6.023\times 10^{23}}{1}\times 0.11=0.66\times 10^{23}$ atoms

Thus 6.0 g of silicon has more atoms

3 0

3 years ago

Gamma-ray bursters emit pulses of gamma rays with high energies. The frequency of the most energetic pulses has been measured at

Novosadov [1.4K]

The wavelength of these gamma rays will be 1x1 $10^{-13}$ m.

How do you define wavelength?

The distance between two successive troughs or crests is known as the wavelength. The peak of the wave is the highest point, while the trough is the lowest.

The wavelength is also defined as the distance between two locations in a wave that have the same oscillation phase.

The length of a wave is measured in its propagation direction. The wavelength is measured in meters, centimeters, nanometres, and other units since it is a distance measurement.

The relationship between the wave's wavelength, frequency, and speed is given as

wavelength = speed of light ÷ frequency

wavelength = $\frac{3 X10^8}{3.0 X10^{21}}$