CHEMISTRY HIGH SCHOOL

An atom with 9 protons and 10 neutrons in its nucleus and 9 electrons in movement around the nucleus would be an atom of which element?A: Beryllium
B: Neon
C: Fluorine
D: Potassium

Answers

Answer 1
Answer:

Answer: The element is Fluorine.

Explanation:

Atomic number is defined as the number of protons or electrons that are present in a neutral atom.

Atomic number = number of protons = number of electrons

Atomic mass is defined as the sum of number of protons and neutrons that are present in an atom.

Atomic mass = Number of protons + Number of neutrons

We are given:

Number of protons = 9 = Atomic number

Number of electrons = 9

Number of neutrons = 10

Mass number = 9 + 10 = 19

The element having atomic number equal to 9 and mass number equal to 19 is fluorine.

Hence, the element is Fluorine.
Answer 2
Answer: The correct answer is C.  We know this is true since the number of protons an atom has is its atomic number.  Since this atom  has 9 protons, look for the element on the periodic table that has an atomic number of 9.  The element that has an atomic number of 9 is flouring.

I hope this helps.

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Calculate the heat energy for this scenario: You are repeating the food experiment we did in class with a different food snack. At the beginning of this experiment, you started with 25 grams of water at 22 deg * C At the end of the experiment, the final temperature of the water is 45°C. The specific heat of water is 4.18J / (deg) * CSub and solve

Answers

Answer:

Mass of water (m) = 25 grams = 0.025 kg (since 1 g = 0.001 kg)

Specific heat of water (c) = 4.18 J/(g°C) = 4.18 J/(kg°C)

Initial temperature (T_ {initial}) = 22°C

Final temperature (T_(final) )= 45°C

Change in temperature (ΔT):

ΔT=T_(final)-T_ {initial}=45°−22°=23°

Now, calculate the heat energy (Q)

Q=mass×specific heat×ΔT

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Q≈2.44kJ

So, the heat energy for this scenario is approximately 2.44 kilojoules (kJ).

How can states of matter be helpful in life?

Answers

you will know that there is a long period where the temperature stays the same before any change in state of matter, and will not appear stupid in conversations

States of matter is useful in life because without solids we would have no cups shoes or tables and without liquids we wont be able to survive because we need water aka LIQUID to survive and without gases we wouldnt be able to breathe.

Is a euglena abiotic or biotic

Answers

I think it is biotic. hope this helps.

Which formulas represent two polar molecules?(1) CO2 and HCl (3) H2O and HCl
(2) CO2 and CH4 (4) H2O and CH4

Answers

Answer is: 3) H2O and HCl.

Polar molecules are water (H₂O) and hydrochloric acid (HCl).

Nonpolar molecules are carbon(IV) oxide (CO₂) and methane (CH₄).

Carbon(IV) oxide is nonpolar because CO₂ is linear molecule and the oxygen atoms are symmetrical (bond angles 180°).

Water is polar because of the bent shape of the molecule.

Hydrochloric acid has polar covalent chemical bond where hydrogen has oxidation umber +1  and chlorine oxidation number -1.

In molecule of methane (CH₄) all the atoms around the central element (carbon) are equivalent (four hydrogens) and it has a net dipole moment of 0 (vectors of dipole moments cancel each other, dipole moment is zero).
The answer to ur question would acutually be number 3 H20 and HCI hope i helped

Chlorine melts at 172 k what is chlorines melting point in C

Answers

<HTML><META HTTP-EQUIV="content-type" CONTENT="text/html;charset=utf-8"> <p class="answer-detail Fw-n" id="yui_3_17_2_3_1463589225479_1149"><SPAN class="ya-q-full-text" id="yui_3_17_2_3_1463589225479_1148" itemprop="text">K = 273.15 + C <BR><BR>K = 172 so substitute <BR><BR> 172 = 273.15 + C <BR><BR> C = 172 - 273.15 = -101.15</SPAN> </DIV>

Which compound would most likely turn litmus paper to a red color?a. CH₃CH₂CH₂OH 
b. CH₃CH(Br)CH(Br)CH₃
c. CH₃CH₂CH(Br)CH₃
d. CH₃CH₂CH₂COOH 
e. CH₃CH₂CH₂CH₃

Answers

answer D, because it's acid
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