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3 years ago

The number of waves that pass a point in one second is called ________________________________

1 answer:

3 0

The characteristics of a wave are given certain names to describe them, and this helps scientists to accurately describe any given wave. The characteristic known as frequency describes the number of waves that pass a point, and it is measured in waves per second, or Hertz, which is given the symbol Hz, but can also be described using the inverse of the SI unit for second, s^-1.

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Write the complete symbol, including mass number and atomic number, for each atom.

Reil [10]

Answer:

a) 58Ni

b) 43Ti

c) 34P

d) 18O

e) 58Ni

f) 43Ti

g)34P

h) 18O

i) 54Cr

Explanation:

a) contains 28 protons and 30 neutrons:

An atom with 28 protons and 30 neutrons has an atomic number of 28 and a mass number of (30+28) = 58.

The atom with atomic number 28 is Ni.

b) contains 22 protons and 21 neutrons:

An atom containing 22 protons and 21 neutrons has an atomic number of 22 and an atomic mass of (22+21) = 43

The atom with atomic number 22 is Titanium (Ti).

This is the 43Ti isotope of titanium

c) contains 15 electrons and 19 neutrons

An atom with 15 electrons would have the same amount of , 15 protons (considering it to be neutral) and has 19 neutrons.

Thus, the atomic number of the atom would be 15 and the mass number would be (15+19) = 34

The atom with atomic number 15 is phosphorus (P).

This is the 34P isotope of phosphorus

d) an oxygen atom with 10 neutrons:

Oxygen has an atomic number of 8, thus there are 8 protons in an atom of oxygen.

The mass number of the oxygen atom with 10 neutrons would be (8+10) = 18

This is 18O - isotope.

e) contains 28 protons and 30 neutrons:

An atom with 28 protons and 30 neutrons has an atomic number of 28 and a mass number of (30+28) = 58.

The atom with atomic number 28 is Ni.

f) contains 22 protons and 21 neutrons:

An atom containing 22 protons and 21 neutrons has an atomic number of 22 and an atomic mass of (22+21) = 43

The atom with atomic number 22 is Titanium (Ti).

This is the 43Ti isotope of titanium

g) contains 15 electrons and 19 neutrons:

An atom with 15 electrons would have the same amount of , 15 protons (considering it to be neutral) and has 19 neutrons.

Thus, the atomic number of the atom would be 15 and the mass number would be (15+19) = 34

The atom with atomic number 15 is phosphorus (P).

This is the 34P isotope of phosphorus

h) an oxygen atom with 10 neutrons:

Oxygen has an atomic number of 8, thus there are 8 protons in an atom of oxygen.

The mass number of the oxygen atom with 10 neutrons would be (8+10) = 18

This is 18O - isotope.

i) The atomic number of Cr is 24

The mass number is given to be 54.

This is the 54Cr isotope and has 24 protons and 30 neutrons

8 0

3 years ago

Determine whether each melting point observation corresponds to a pure sample of a single compound or to an impure sample with m

daser333 [38]

The question is incomplete, the complete question is;

Determine whether each melting point observation corresponds to a pure sample of a single compound or to an impure sample with multiple compounds.

Experimental melting point is BELOW literature value

Experimental melting point is CLOSE to literature value

WIDE melting point range

NARROW melting point range

Answer:

narrow melting point-pure sample of a single compound

experimental melting point is close to literature value-pure sample of a single compound

wide melting point range-impure sample of multiple compounds

experimental melting point is below literature value-impure sample of multiple compounds

Explanation:

The experimental melting point of a pure single compound is sharp and extremely close to the melting point of the substance as recorded in the literature. Usually, a pure substance melts within a narrow range of temperatures.

Impure samples of multiple compounds melt over a range of temperatures. Also if the experimental melting point is well below the record in literature, then the sample is contaminated by other compounds.

4 0

2 years ago

How many atoms of neon (Ne) are in a 1452.96 moles sample of neon?

Firlakuza [10]

Answer:

8749.73× 10²³ atoms of He

Explanation:

Given data:

Number of atoms of neon = ?

Number of moles of neon = 1452.96 mol

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

1452.96 mol × 6.022 × 10²³ atoms of He/ 1 mol

8749.73× 10²³ atoms of He

7 0

3 years ago

(12 points) please please help me thanks

Vedmedyk [2.9K]

Answer: i think its the thired one

Explanation:

6 0

2 years ago

Read 2 more answers

To achieve an octet of valence electrons, a cesium atom will become an ion with what charge?

lesantik [10]

The answer is +1 because it gives up it's electron and becomes positive:)

8 0

2 years ago