Which substance has a melting point greater than room temperature
O A. argon
O B. oxygen
O
C. mercury
O D. aluminum

Answer:

c. protons and neutrons are found in the nucleus

d. protons and neutrons have approximately the same mass

Explanation:

There are three fundamental particles within an atom which are the protons, neutrons and electrons.

The protons are the positively charged particles within an atom

Neutrons do not carry any charges

Electrons are the negatively charged particles.

Answer:

I have made it in above figure hope it helps

Answer:

C. 414 kJ

Explanation:

Given parameters:

Mass of copper  = 2kg

Unknown:

Amount of energy required to melt the copper  = ?

Solution:

To solve this problem, we use:

       Q  = m L

m is the mass

L is the latent heat of fusion of copper  = 207kJ/kg

So;

        Q = 2 x 207  = 414kJ

Answer:

2 hydrogen and 1 oxygen

Explanation:

H2O

Hydrogen has the coefficient so you multiply 1 by 2 and it equals 2

Oxygen does not have any sub or coe so its automatically 1

Answer:

λ  =  1.5 m

Explanation:

Given data:

Speed of wave = 1500 m/s

Frequency of sound = 1000 Hz

Wavelength of sound = ?

Solution:

Speed of wave = frequency × wavelength

by putting values,

1500 m/s  = 1000 Hz ×  λ

λ  =  1500 m/s  / 1000 s⁻¹     (Hz =  s⁻¹ )

λ  =  1.5 m

Answer: 1.5

Explanation:

Well first you do

1500/ 1000= 1.5 which mean

The wavelength is 1.5

Answer:

Answer:

B.) conclusion

Answer:

2.No. because in an open system, gas will blow up & so, if it's measured, it won't have the equal amount of the reactant. But, if you arrange this reaction in a closed system, then it will be the same.

3.2SiO2+4Cl2= 2SiCl4+O2

Explanation:

Answer:

1280L

Explanation:

Given parameters:

Initial pressure  = 0.727atm

Temperature  = 26.9°C

Initial volume  = 726mL  = 0.726L

New pressure  = 0.412atm

Unknown:

New volume of the gas sample  = ?

Solution:

To solve this problem, we apply boyles law;

            P1V1  = P2V2

P and V are pressure and temperature

1 and 2 are initial and new state

             0.727 x 0.726  = 0.412 x V2

                   V2  = 1.28mL  = 1280L

Answer: i think it is 144.16

Explanation:

Answer:

4.99 ×10²³ molecules

Mass = 28.22 g

Explanation:

Given data:

Mass of H₂O₂ produced = ?

Mass of water react = 14.86 g

Number of molecules of H₂O₂ produced = ?

Solution:

Chemical equation:

2H₂O + O₂        →     2H₂O₂

Number of moles of water:

Number of moles = mass/molar mass

Number of moles = 14.86 g/ 18 g/mol

Number of moles = 0.83 mol

Now we will compare the moles of water and H₂O₂.

                   H₂O          :               H₂O₂

                    2              :                2

                  0.83           :             0.83

Mass of H₂O₂:

Mass = number of moles × molar mass

Mass = 0.83 mol × 34 g/mol

Mass = 28.22 g

Number of molecules:

1 mole = 6.022×10²³ molecules

0.83 mol × 6.022×10²³ molecules / 1 mol

4.99 ×10²³ molecules

Answer:

no

Explanation:

it is condensation not physical change

Answer:

Theoretically not directly describing, .Atoms vs Ions an ion is an electrically charged particle produced by either removing electrons from a neutral atom to give a positive ion or adding electrons to a neutral atom to give a negative ion. When an ion is formed, the number of protons does not change.

Neutral atoms can be turned into positively charged ions by removing one or more electrons. A neutral sodium atom, for example, contains 11 protons and 11 electrons. By removing an electron from this atom we get a positively charged Na+ ion that has a net charge of +1.

Atoms that gain extra electrons become negatively charged. A neutral chlorine atom, for example, contains 17 protons and 17 electrons. By adding one more electron we get a negatively charged Cl- ion with a net charge of -1.

The gain or loss of electrons by an atom to form negative or positive ions has an enormous impact on the chemical and physical properties of the atom. Sodium metal, for example, which consists of neutral sodium atoms, bursts into flame when it comes in contact with water. Neutral chlorine atoms instantly combine to form Cl2 molecules, which are so reactive that entire communities are evacuated when trains carrying chlorine gas derail. Positively charged Na+ and negatively charged Cl- ions are so unreactive that we can safely take them into our bodies whenever we salt our food.

Explanation:

mark brainlist

Answer:

B.9

Explanation:

Answer:

The answers to your question are given below

Explanation:

The equation for the reaction is given below:

2KClO₃ —> 2KCl + 3O₂

The total number of each atoms present in the reactants and products can be obtained by doing a head count as illustrated below:

Reactants >>>>>> Number of atoms

Potassium (K) >>> 2 × 1 = 2

Chlorine (Cl) >>>> 2 × 1 = 2

Oxygen (O) >>>>> 2 × 3 = 6

Products >>>>>>> Number of atoms

Potassium (K) >>> 2 × 1 = 2

Chlorine (Cl) >>>> 2 × 1 = 2

Oxygen (O) >>>>> 3 × 2 = 6

Answer:

(1) 25.0cal/g (2) 540cal/g (3) 327 cal/g (4) 8,180 cal/g 82 If 11 grams of a gas occupies 5.6 liters at STP, what is its gram molecular mass? (1) 11 g/mol (2) 22 g/mol

Answer:

b

Explanation:

The total number of moles of CO2 formed : 10

Further explanation

Given

Reaction

CaCO3(s) + 2HCl(aq) ⇒CaCl2(aq) + H2O( ) + CO2 (g)

20. moles of HCl

Required

moles of CO2

Solution

The reaction coefficient in the chemical reaction equation shows the mole ratio of the elements in the reactants and products

From the equation, mol ratio of HCl : CO2 = 2 : 1, so mol CO2 :

= 1/2 x mol HCl

= 1/2 x 20

= 10 moles

Answer:

27.3% of Carbon (C), 72.7% of Oxygen (O).

Answer:

Alkenes contain a double bond that is composed of one sigma and one pi bond between two carbon atoms. The sigma bond has similar properties to those found in alkanes , while the pi bond is more reactive. The carbon atoms in the double bond are sp² hybridized , forming a planar structure.

Explanation:

Believe it!!!

Answer:

64.642

Explanation:

To find the miles per hour of each trip, you would divide the miles by the amount of time, in hours, driven. So that leaves you with the first trip being 65 miles per hour on average, and the second trip being about 64.285.

Then, to find the average for both stops, or the entire trip, you would add those two numbers together (65 and 64.285), divide by two (because that's the total number of numbers in the series), and you'd get 64.64!

Finding the Average:

To find the average of a series of numbers, simply add them all together and then divide by the amount of numbers there are.

Answer:

Hello  there!

The first answer is hot

The second answer is sunshine!

Explanation:

Those make the most sense

Have a great day!

Answer:

bran fart is kewl

Explanation:

yes

Answer:

B. 6

Explanation:

Isotope given:

                      ¹⁴₆C

In specie written as this;  

  Superscript  = Mass number

  Subscript  = Atomic number

To find the protons, it is the same as the atomic number;

               Protons  = Atomic number  = 6

Neutrons have no charges;

Neutrons  = Mass number - Atomic number  =

 Neutrons  = 14 - 6  = 8

The number of electrons is the same as the atomic number = 6

Answer:

Explanation

whats your question

Answer:

A

Explanation:

In simple terms: Hammer goes one way, air goes the other way.

Answer:

d

Explanation:

i took the test

Answer:

a

Explanation:

Answer:

D

Explanation:

The frequency : f = 4.478 x 10¹⁴ /s

Given

wavelength = 670 nm = 670 x 10⁻⁹ m = 6.7 x 10 ⁻⁷ m

Required

The frequency

Solution

Wavelength : from the crest to the crest of the next wave or the trough to the trough

Frequency (f): number of waves in one second

Can be formulated :

 v = λ x f

f = v / λ

So the frequency is inversely proportional to the wavelength

v = 3 x 10⁸ m/s(speed of light)

Input the value :

f = 3 x 10⁸ m/s : 6.7 x 10 ⁻⁷ m

f = 4.478 x 10¹⁴ /s

Answer: I think that trains move faster then cars! Buttt, The trains are much stronger and bigger, then cars or trucks. Even if they move slowly they can still crush something smaller then them.

Explanation: ( didnt really understand the question, but i tried)

Answer:

1)2kclo3=2kcl+3o2

2)2NaCl+F2=2NaF+cl2

3)Pb(OH)2+2HCl=2H2O+PbCl2

4)2Albr3+3k2so4=6kbr+al2(so4)3

5)CH4+2O2=CO2+2H2O