CHEMISTRY HIGH SCHOOL

How many (s) sublevels are present in calcium atom (Ca)?

Answers

Answer 1

Answer:

Answer:

nineteen atoms

Explanation:

nineteen atoms

Related Questions

Electrically charged atoms or combinations of atoms are called ________.
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Which statements describe elements?- Elements can be separated using physical means.- Elements are made of atoms with the same atomic number.- Elements cannot be separated using ordinary chemical means.- Elements may be represented by chemical symbols.- Elements are made of two or more different types of atoms.
According to the following reaction, how many moles of carbon monoxide will be formed upon the complete reaction of 23.1 grams of benzene (C6H6) with excess oxygen gas?benzene (C6H6) (l) + oxygen (g) carbon monoxide (g) + water (g)
High levels of cholesterol can first lead directly to __________.a. strokes b. arteriosclerosis c. heart attacks d. heart failure

Which of the following steps is important to critical thinking?

Answers

Answer:

utilizing facts

Explanation:

Critical thinking helps you come up with solutions to problems.

Of all boron atoms, 19.9%% are boron-10, which have a mass of 10.01294 amu. The other 80.1% of boron atoms are boron-11 and these have a mass of 11.00931. Calculate the average atomic mass of boron.

Answers

Answer:

10.81 amu

Explanation:

The average atomic mass of Boron can be calculated as follows :

$A=19.9\%\ \text{of}\ 10.01294 +80.1\%\ \text{of}\ 11.00931\n\nA=(19.9)/(100)* 10.01294 +(80.1)/(100)* 11.00931\n\nA=10.81\ \text{amu}$

So, the average atomic mass of boron is 10.81 amu.

In the unit cell of galena, six square faces of equal size each form 90 degree angles with every adjacent face. What type of crystal system is this?tetragonal
hexagonal
triclinic
cubic

Answers

Answer : The correct option is, Cubic.

Explanation :

As there are seven types of crystal systems which are cubic, tetragonal, orthorhombic, monoclinic, triclinic, rhombohedral and hexagonal.

A unit cell is characterized by the axial length (a, b and c) and axial angle $(\alpha ,\beta ,\gamma )$ parameters which decide the size and shape of the unit cell.

In tetragonal crystal system, $a=b\neq c$ and $\alpha=\beta=\gamma=90^o$

In hexagonal crystal system, $a=b\neq c$ and $\alpha=\beta=90^o,\gamma=120^o$

In triclinic crystal system, $a\neq b\neq c$ and $\alpha\neq \beta\neq \gamma=90^o$

In cubic crystal system, $a=b=c$ and $\alpha=\beta=\gamma=90^o$

Hence, the correct option is, Cubic.

Which equation is a decomposition reaction?a. Li2CO3 ---> Li2O + CO2

b. Zn + HCl ---> ZnCl2 + H2

c. Na2O + CO2 ---> Na2CO3

d. C6H12O6 + O2 ---> CO2 + H2O

please help asap

Answers

Answer : (a) $Li_2CO_3\rightarrow Li_2O+CO_2$ is a decomposition reaction.

Explanation :

(a) $Li_2CO_3\rightarrow Li_2O+CO_2$ is a decomposition reaction.

Decomposition reaction : It is a type of chemical reaction in which a single compound decomposes into two or more compounds.

(b) $Zn+2HCl\rightarrow ZnCl_2+H_2$ is a displacement reaction.

Displacement reaction : It is a type of reaction in which a most reactive element displaces the least reactive element in a compound.

(c) $Na_2O+CO_2\rightarrow Na_2CO_3$ is a combination reaction.

Combination reaction : It is a type of reaction where two or more compounds combine to form a single compound.

(d) $C_6H_(12)O_6+6O_2\rightarrow 6CO_2+6H_2O$ is a combustion reaction.

Combustion reaction : It is a type of reaction where a hydrocarbon react with the oxygen to produced carbon dioxide and water.

Therefore, option (a) is a decomposition reaction.

The reaction in which reactant breaks down into more than one constituents is called decomposition reaction. So option A. Li2CO3 ---> Li2O + CO2 is correct.

Substance A is mixed with water and donates 0.4% of its H+ ions. Which of the following BEST describes Substance A?A.
It is a strong base and a very poor conductor of electric current.

B.
It is a strong acid and a very good conductor of electric current.

C.
It is a weak base and a very good conductor of electric current.

D.
It is a weak acid and a poor conductor of electric current.

Answers

Substance A is mixed with water and donates 0.4% of its H⁺ ions, therefore given substance is a weak acid & show poor conduction of electric current.

What are acids?

According to the Arrhenius theory of acids and bases, acids are those species which gives H⁺ ion to the solution.

In the question it is given that, substance A is mixed with water and it donates H⁺ ion, from this it is clear that given substance is acid. It is also mention that it donates only 0.4% of its H⁺ ion means partial dissociation is observed, so we conclude that this acid is weak in nature. And due to weak dissociation and less number of available H⁺ ion it did not conduct electricity effectively.

Hence, option (D) is correct i.e. it is weak acid and a poor conductor of electric current.

To know more about acids, visit the below link:

brainly.com/question/12916250

Answer:

Explanation:

Length is a fundamental quantity. give reason.

Answers

Answer:

Explanation:

There is a fundamental length, the Planck length. It is the length that light (a photon) travels in a unit of time called the Planck time and conforms to the way to measure length in general, as given by the equation

L = ct

Where L is length (or distance), c the speed of light (3 X 10^8 meters/sec), and t the time the light travels in. The Planck length is exceedingly small (magnitude 10^-35 meters because the Planck time is short (10^-44 sec)

The Planck length, or any length based on the speed of light, is not subject to the imprecision we would find by measurement with a physical ruler, for example, because a ruler can expand or shrink or be bent or warped, etc.

Rather, length based on c (in a vacuum) is constant. This concept is another gift from Einstein’s theory of special relativity. It’s also the central concept in spacetime, though it would take some explaining for me to say why it is so.

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Which is a redox reaction?A) 2KBr + F2 ---> 2KF + Br2 B) 2HCL + Mg(OH)2 --> 2HOH + MgCl2 C) 2NaCl + H2SO4 --> Na2SO4 + 2HCl D) Ca(OH)2 + Pb(NO3)2 --> Ca(NO3)2 + Pb(OH)2 I know the answer is A, but confused as to why that is. Can someone explain this for me? Thanks.