Can someone please help me​

Answer:

The half-life of Th-232 is 1.4 ∙ 10¹⁰ years.

Answer:

Oganesson!

It is a synthetic chemical element with the symbol Og and atomic number 118. It was first synthesized in 2002 at the Joint Institute for Nuclear Research in Dubna, near Moscow, Russia, by a joint team of Russian and American scientists.

Answer:

the last element is ogasnesson

Answer:

D. gain one electron

Explanation:

In order to become a chemically stable ion, a neutral atom of sodium will gain one electron. Therefore, the correct option is option D.

Chemical stability in chemistry refers to a chemical system's thermodynamic stability. When a system reaches its lowest energy state or in thermodynamic equilibrium with its surroundings, thermodynamic stability occurs.

It could be a spontaneous process when the total number of atoms or molecules in a given shape is conserved despite the fact that individual particles or atoms change forms. In order to become a chemically stable ion, a neutral atom of sodium will gain one electron.

Therefore, the correct option is option D.

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Answer:

5

Explanation:

20/4

Answer:

116g/mol

Explanation:

Mg=24

NO2=46

multiple 46 by 2and then add 24

The molar mass of  Mg(NO₂)₂ is  116.33 g/mol.

To calculate the molar mass of Mg(NO2)2, we need to determine the atomic masses of each element in the compound and multiply them by their respective subscripts.

The atomic masses of the elements involved are:

Mg (magnesium) = 24.31 g/mol

N (nitrogen) = 14.01 g/mol

O (oxygen) = 16.00 g/mol

The compound Mg(NO₂)₂ contains one magnesium atom (Mg), two nitrate ions (NO₂), and each nitrate ion contains one nitrogen atom (N) and two oxygen atoms (O).

Molar mass of Mg(NO₂)₂ :

Mg: 1 × 24.31 g/mol = 24.31 g/mol

N: 2 × 14.01 g/mol = 28.02 g/mol

O: 4 × 16.00 g/mol = 64.00 g/mol

Now, add up the individual masses:

24.31 g/mol + 28.02 g/mol + 64.00 g/mol = 116.33 g/mol

Therefore, the molar mass of Mg(NO₂)₂  is 116.33 g/mol.

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Answer:

A

Explanation:

Answer: signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.

Explanation:

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Answer:

b) ions

Explanation:

Answer: all of the above

Explanation:

Answer:

Invertebrates are animals which do not have vertibral column. They do not debelop it also. For example: Arthropods , Crawfish and Sea Urchin.

Answer:

[Kr] 4d² 5s² option b will be correct answer

Answer:

calcium hydroxide.............

The Alkaline earth metal present in the following materials like lime stone , slaked lime , quicklime and gypsum is Calcium and the Alkaline earth metal present in Epsom salt is Magnesium.

The alkaline earth metals are those elements that correspond to group 2 in the modern periodic table which includes beryllium, magnesium, calcium, strontium, barium, and radium. The elements in this group are quite similar in their physical and chemical properties.

For above information, Calcium is the [tex]20^t^h[/tex]element and Magnesium is the [tex]12^t^h[/tex] element in the periodic table.

Chemically, the given materials which are mentioned above is represented in following manner.

Limestone is Calcium Carbonate -[tex]CaCO_3[/tex]

Slaked Lime is Calcium Hydroxide - [tex]Ca(OH)_2[/tex]

Quicklime is Calcium Oxide - CaO

Gypsum is Calcium Sulfate Dihydrate - [tex]CaSO_4.2H_2O[/tex]

Epsom salt is Magnesium Sulfate - [tex]MgSO_4[/tex]

Thus, the Alkaline earth metal present in the following materials like lime stone , slaked lime , quicklime and gypsum is Calcium and the Alkaline earth metal present in Epsom salt is Magnesium.

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The above question is incomplete. Completed question is Which alkaline earth metal is the components of the following. Materials lime stone , slaked lime , quick lime , gypsum , Epsom salt.

Answer:

[tex]q=8\times 10^{-19}\ C[/tex]

Explanation:

Given that,

The charge of a single proton is [tex]1.6\times 10^{-19}\ C[/tex]

There are 5 protons in the nucleus. The nuclear charge of an atom of boron is given by :

[tex]q=5\times 1.6\times 10^{-19}\\\\q=8\times 10^{-19}\ C[/tex]

So, the required charge is [tex]8\times 10^{-19}\ C[/tex].

Answer:

16

Explanation:

Answer:

its 16

Explanation:

i took the quiz and it was right

Answer:

Reactants have more energy than products

Explanation:

Generally, in an exothermic reaction heat is released. In other words, energy is released. So you start with reactants which have a set amount of stored chemical energy, and you lose some in the reaction. Since energy is 'leaving', the stored chemical energy in the products is less than what we started with in the reactants. When given a graph, you can tell this is true because going from left to right, the line representing the stored chemical energy will start at a higher level than where it ends.

The true statement about an exothermic reaction is that reactants have more energy than products.

An exothermic reaction is one in which the energy of reactants is greater than that of products. As such, energy is given off during the reaction in form of heat.

Thus, the true statement about an exothermic reaction is that reactants have more energy than products.

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Answer:

[tex]\boxed {\boxed {\sf 0.5043 \ mol \ P}}[/tex]

Explanation:

To convert from moles to grams, we must use the molar mass. This is found on the Periodic Table. Look for Phosphorous or P.

We can use this number as a ratio.

[tex]\frac{30.973762 \ g \ P }{1 \ mol \ P}[/tex]

Multiply by the given number of grams: 15.62

[tex]15.62 \ g \ P *\frac{30.973762 \ g \ P }{1 \ mol \ P}[/tex]

Flip the fraction so the grams of phosphorus cancel.

[tex]15.62 \ g \ P *\frac{1 \ mol \ P}{30.973762 \ g \ P }[/tex]

[tex]15.62 *\frac{1 \ mol \ P}{30.973762 }[/tex]

[tex]\frac{15.62 \ mol \ P}{30.973762 }[/tex]

Divide.

[tex]0.504297799 \ mol \ P[/tex]

The original measurement of grams has 4 significant figures, so our answer must have the same.

For the number we calculated, that is the ten thousandth place. The 9 in the hundredth thousandth place tells us to round the 2 to a 3.

[tex]0.5043 \ mol \ P[/tex]

There are 0.5043 moles of phosphorus in 15.62 grams.

Answer:

radio waves

Explanation:

which has the longest wavelength and lowest frequency and energy. Ultraviolet light (UV) is divided into three regions: UV A, wavelength = 400 - 320 nm UV B, wavelength = 320 - 280 nm

Answer:

Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward one another. On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the ocean tides.

Gravity, also called gravitation, in mechanics, the universal force of attraction acting between all matter. ... On Earth all bodies have a weight, or downward force of gravity, proportional to their mass, which Earth's mass exerts on them. Gravity is measured by the acceleration that it gives to freely falling objects

The gravitational force is a force that attracts any two objects with mass. We call the gravitational force attractive because it always tries to pull masses together, it never pushes them apart. In fact, every object, including you, is pulling on every other object in the entire universe!

Gravitational force is the force that attracts to objects with mass. ... This forces tries to pull masses together, that is why attractive in nature. For example: When ball is thrown upwards it always come downwards after a certain height because the ball is pulled or attracted by the Earth's gravitation la force.

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Answer:

Good Question!!! No one has found the answer to that question.

Explanation:

Answer:

A. He sent a cathode ray between electrically charged metal plates

B) 1 and 3

it's the right answer

Answer:

For 3rd question, the answer is option D

The description of the molecules shown is it is unsaturated alkynes. The correct option is A.

Alkynes are unsaturated double bond containing compound that react with hydrogen when a catalyst is present.

The pie bond shows that the hydrogen atoms are lost from the alkanes.

Thus, the correct option is A, unsaturated alkynes.

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Answer:

Given

mass of H2O (m) =35.6g

molarmass (mr) = H2O ), 1x2+16=18g/mol

moles of H2O (n) =?

sln

n=m/mr

n=35.6g/18g/mol

n=1.978moles

the moles of H2O are 1.978moles

Answer:

2.6299

its easy