Which element’s symbol could replace the question mark in the diagram?

boron (B)
neon (Ne)
rubidium (Rb)
arsenic (As)

Answer:

long term change

Explanation:

because it takes time

Answer:

D: All of the above

Explanation:

It's all of the above, they are all pretty similar to the accurate answer.

Answer:

D

Explanation:

Answer:

Vanadium

Explanation:

Atomic number increases, thereby changing into an atom of Vanadium

Answer:

Vanadium

Explanation:

Science rocks

Answer:

An atom of Al which has 13 protons and 10 electrons is Al cation (Al⁺³)

Explanation:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other.

For example,

Al atom has 13 protons and 13 electrons. The number of positive and negative charge is equal thus it will be neutral atom.

While the atom of Al which have 13 proton and 10 electron is not neutral. The positive charge is greater than negative by 3. Which means 3 electrons are lose by Al atom and form cation "Al⁺³".

Thus an atom of Al which has 13 protons and 10 electrons is Al cation (Al⁺³)

Answer:

19

Explanation:

Answer:

i have done this before

Explanation:

the bag just starts shrinking after sparkling a little bit

Answer:

H⁺(aq) + OH⁻(aq) = H₂O(l)

Explanation:

To find the net ionic equation start by finding the balanced equation.

2HClO₄(aq) + Ba(OH)₂(aq) ⇒ 2H₂O(l) + Ba(ClO₄)₂(aq)

Then put it into the ionic equation.

2H⁺(aq) + 2ClO₄(aq) + Ba²⁺(aq) + 2OH⁻(aq) ⇒ 2H₂O(l) + Ba²⁺(aq) + 2ClO₄(aq)

Remove all the ions that do not change.

2H⁺(aq) + 2OH⁻(aq) ⇒ 2H₂O(l)

And reduce to the lowest common coefficient.

H⁺(aq) + OH⁻(aq) = H₂O(l)

Answer:

153.6771 amu

Explanation:

From the question given above, the following data were:

Isotope A:

Mass of A = 114.3789 amu

Abundance (A%) = 64.23%

Isotope B:

Mass of B =.?

Abundance (B%) = 100 – A%

Abundance (B%) = 100 – 64.23

Abundance (B%) = 35.77%

average atomic mass of Element Y = 128.4359 amu

The mass of the 2nd isotope (i.e isotope B) can be obtained as follow:

Average atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100]

128.4359 = [(114.3789 × 64.23)/100] + [(Mass of B × 35.77) /100]

128.4359 = 73.4656 + (Mass of B × 0.3577)

Collect like terms

128.4359 – 73.4656 = Mass of B × 0.3577

54.9703 = Mass of B × 0.3577

Divide both side by 0.3577

Mass of B = 54.9703 / 0.3577

Mass of B = 153.6771 amu

Therefore, the mass of the 2nd isotope is 153.6771 amu

newton's first law of motion states than an object motion will not change unless subjected to an external force.

Answer:

the answer is: 10

Explanation:

To find density you do mass divided by volume

Answer:

water

Explanation:

Answer:

c. pizza

Explanation:

Pizza is a heterogeneous mixture because it components are not uniform.

Answer:

A.

Explanation:

give brainlist

Answer:

C, number of protons and neutrons

Answer: air is matter, it has mass and it takes up space

Answer:

The first 3

Explanation:

Eukaryotic cells are usually multicellular, contain a true nucleus, and contain membrane-bound organelles. Hence, options A, B and C are correct.

The eukaryotic cell has a nuclear membrane that surrounds the nucleus, in which the well-defined chromosomes (bodies containing the hereditary material) are located.

Eukaryotic cells are usually multicellular, contain a true nucleus, and contain membrane-bound organelles.

Hence, options A, B and C are correct.

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Answer: close together, moving around one another.

Explanation: to study island answer

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The mass of  C8H18 is 4.788g

In chemistry,

The number of moles of a compound is given as Mass/ Molar mass

For C8H18, The molar mass will be calculated as

C8H18=12 x 8 +1 x 18=96+18=114 g/mol

Putting the value in the equation

Number of moles= Mass/Molar mass

0.042moles =Mass/ 114g/mol

Mass=0.042 x 114=4.788g

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Answer:

a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

Answer:

+6

Explanation:

2(+1)+2x+7(−2)=0

2+2x−14=0

2x=+12

x=+6

Answer: 2

Explanation:

Answer:

It is two

Explanation:

Answer:

Lead tetrachloride

Explanation:

Answer:

Hmmmm,   Z=10   the element is not fluorine, and its not sodium.

Explanation:

If you are doing your chemistry homework, you must have a Periodic Table beside you. You will also be supplied a Periodic Table in every test in Chemistry and Physics you will ever sit. So get your Periodic table, and consider the following. It has 10 electrons, 10 fundamental negative charges. Since the element is neutral, it has 10 fundamental positive charges, 10 protons, in its nucleus. In the nucleus there are also 12 massive, neutral particles, 12 neutrons. The number of protons,  Z, defines the atomic number, and the Periodic Table is arranged according to  Z.

.

Answer:

In a open system, the thermal energy of a system may be changed by adding or removing matter with a different temperature.

Explanation:

The thermal energy of a system can be changed when a new substance of different temperature is introduced into the system

The thermal energy of a system is the amount of heat energy contained in that system.

The quantity of heat in a system is given as;

[tex]Q = mc \Delta \theta[/tex]

where;

[tex]\Delta \theta[/tex] is the change in the temperature of the system

When a new substance is introduced into the system, the temperature of the resulting system changes.

For example;

Thus, the thermal energy of a system can be changed when a new substance of different temperature is introduced into the system.

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Answer:

35.45253819

Explanation:

(0.7578*34.96....)+(0.2422*36.96...)

Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. The average atomic mass of Chlorine is 35.45g.

Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.

Average atomic mass = (mass of first isotope× percent abundance of first isotope)+(mass of second isotope× percent abundance of second isotope)

Substituting the given values

Average atomic mass=(0.7578×34.96....)+(0.2422×36.96...)

Average atomic mass=35.45g

Therefore, the average atomic mass is 35.45g.

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The molecular geometry of molecules is given serially as, tetrahedral,trigonal,tetrahedral,tetrahedral,linear,linear.

Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.

It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.

They provide information about geometry by taking into considerations the vibrational and rotational absorbance of a substance.Neutron and electron diffraction techniques provide information about the distance between nuclei and electron density.

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Answer:

the experimental variable

Explanation:

Answer:

1. Measuring the weight of an apple- scale.

2. Studying a distant object- telescope.

3. Studying a very small object- microscope.

4. Measuring the length of a book- ruler.

5. Measuring the temperature of a cup of tea- thermometer.

Explanation:

1. A scale or measuring scale is used to measure or take the weight of any object. It can be either an analog or digital scale as long as the measurements can be taken from it. So, measuring the weight of an apple can be done on a measuring scale.

2. A telescope is an instrument that is used in scientific, especially in space explorations, to study a distant object in the universe/ sky. It gives a clear image and enables a person to view things closer than they are. So, a telescope can be used to study distant objects.

3. A microscope is used to study very different small objects, such as microbes and other organisms. It enlarges the objects to be viewed and thus, enables them to be studied in detail.

4. A ruler may be used to measure the length of a book. It has indications or marks by which the lengths can be taken.

5. A thermometer is an instrument that is used to measure the temperature of anything, be it a person or even other things such as food and even a cup of tea.  

Answer:

Match each tool on the left with its most likely use on the right by choosing the correct number.

4

ruler

1

scale

2

telescope

5

thermometer

3

microscope

Explanation:

Explanation:

marble is the correct answer

Answer:

Elephant

Explanation:

An elaphant is the option with the most mass.

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