Which ones are elements, compounds I’ll give brainliest.

Answer:

It is soft and white. It has a low melting and boiling point, a good conductor electricity, and reacts with water. Furthermore, it is also highly reactive, malleable, and ductile.

Explanation:

Hope I helped!

Answer:

silvery-white and waxy

Explanation:

Properties means the observations you can make just by looking at it or the qualities that the object has.

So when I looked at the sodium I saw a silvery-white metal (sodium is a metal), that has this waxy appearance to it.

Answer: i think it is 144.16

Explanation:

Answer:

B. 3+

Explanation:

When Fe²⁺ loses an electron, it becomes an Fe³⁺ ion.

   The loss of an electron in an atom makes the atom becomes positively charged. Further losing electrons makes the atom more positive.

 For the given ion;

 Fe²⁺   if it loses an electron more, it becomes Fe³⁺.

The expression is given as:

         Fe²⁺    →    Fe³⁺  +  e⁻

Answer:

I just looked up the types of matter energy has.

Explanation:

I believe the answer is D.

Sally's list of matter that have energy is not complete as all the types of matter have energy as all matter have mass , and mass and energy are related, so she should have added gases and solids to her list.

Matter in chemistry, is defined as any kind of substance that has mass and occupies space that means it has volume .Matter is composed up of atoms which may or not be of the  same type.

Atoms are further made up of sub atomic particles which are the protons ,neutrons and the electrons .The matter can exist in various states such as solids, liquids and gases depending on the conditions of temperature and pressure.

The states of matter are inter convertible into each other by changing the parameters of temperature and pressure.

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Answer:

It is a Physical change, have a great day :)

Explanation:

A chemical change is a permanent change. A Physical change affects only physical properties i.e. shape, size, etc. ... Some examples of physical change are freezing of water, melting of wax, boiling of water, etc. A few examples of chemical change are digestion of food, burning of coal, rusting, etc.

The molecular formula of a compound gives the actual number of atoms of various elements present in one molecule of the compound. The molecular mass is 92 g/mol. The correct option is C.

The empirical formula of a compound can be defined as the formula which gives the simplest whole number ratio of atoms of various elements present in one molecule of the compound.

The molecular formula of a compound is a whole number multiple of its empirical formula.

Molecular formula = n × Empirical formula

The value of 'n' can be obtained from the relation:

n = Molecular mass / Empirical formula mass

Here the value of n = 2. Then,

Molecular mass = n × Empirical formula mass

Empirical formula mass of NO₂ = 45.8 g

2 × 45.8 = 91.6 ≈ 92 g/mol

Thus the correct option is C.

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Answer:

Apollo 11 made a capsule landing

Explanation:

Answer: i don’t know what type of landing you mean

Explanation:

They did a lunar landing then reentry and then capsule landing.

Answer:

oxygen makes up 21 percent of the atmosphere

Explanation:

Touching or tasting these unknown substances could be lethal or cause severe burns to your skin, so it is advisable to use other methods to identify substances.

It would be Ionic Compounds.

Answer:

Nitrogen and Oxygen make up 99% of the Earths atmosphere. Then Argon makes up the rest of the atmosphere.

Answer:

Explanation:

The reaction expression is given as:

           ⁴⁰₁₈ Ar   →   X  +  ⁰₁B  

To solve this problem, we must bear in mind that both mass number and atomic number must be conserved.

 So;

For the mass number:

               40  = A + 0

                 A  = 40

For atomic number:

                 18  = Z + 1

                  Z = 18 - 1  = 17

An atom is identifiable by the atomic number. Since the atomic number of X is 17 then it is Cl, chlorine

Answer:

T₁ = 563.19 K

Explanation:

Given data:

Initial volume = 359 mL

Final volume = 269 mL

Final temperature = 422 K

Initial temperature = ?

Solution:

The given problem will be solve through the Charles Law.

Charles Law:

According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

T₁ = V₁T₂ / V₂

T₁ = 359 mL × 422 K / 269 mL

T₁ = 151498 mL.K / 269 mL

T₁ = 563.19 K

Answer:hope this help

Explanation:

Answer:

[tex]Distance = 40km[/tex]

Explanation:

Given

[tex]Speed = 80km/hr[/tex]

[tex]Time = 0.5hr[/tex]

Required

Determine the distance covered

Distance is calculated as:

[tex]Distance = Speed * Time[/tex]

Substitute values for Speed and Time

[tex]Distance = 80km/hr * 0.5hr[/tex]

[tex]Distance = 80km * 0.5[/tex]

[tex]Distance = 40km[/tex]

Hence, you travelled 40km

Answer:

B

Explanation:

Answer:

NaCl and Br2

Explanation:

Edge 2020

Answer:

The Answer is C: Na and Br3

Explanation:

Answer:

21.25

Explanation:

Answer: Convection Currents

Explanation:

Due to the different   temperature occurring at the  upper and lower layers  of the mantle, it causes  heat transfer to occur. One of such heat transfer is the Convection currents which causes  warmer, less dense rock material in the core to rise through the mantle. Also, the cooler rocks in the higher mantle move slowly towards the core.The movement caused by these  Convection current in the Earth are  called plate tectonics which are responsible for earthquakes and volcanoes.

Answer:

electrical --> light

Explanation:

Answer:

0.1mole

Explanation:

Given parameters:

Pressure = 0.0884atm

Temperature  = 6°C  = 6 + 273  = 279K

Volume occupied  = 26.5L

Unknown:

Number of moles  = ?

Solution:

To solve this problem, we are going to use the ideal gas equation:

           PV  = nRT

P is the pressure

V is the volume

n is the number of moles

R is the gas constant  = 0.082atmLmol⁻¹k⁻¹

T is the temperature.

  Insert the parameters and solve for n;

     0.084 x 26.5  = n x 0.082 x 279

              n  = 0.1mole

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:

A) Abosrbed

Explanation:

The change is endothermic, meaning the material absorbs energy when it changes its phase from a solid to a liqiud.

Answer:

[tex]1.167\times 10^{-3}\ \text{mol/h}[/tex]

Explanation:

[tex]R_1[/tex] = Rate of diffusion of [tex]CO_2[/tex] = [tex]9.31\times 10^{-4}\ \text{mol/h}[/tex]

[tex]R_2[/tex] = Rate of diffusion of [tex]N_2[/tex]

[tex]M_1[/tex] = Molar mass of [tex]CO_2[/tex] = 44.01 g/mol

[tex]M_2[/tex] = Molar mass of [tex]N_2[/tex] = 28.0134 g/mol

From Graham's law we have the relation

[tex]\dfrac{R_1}{R_2}=\sqrt{\dfrac{M_2}{M_1}}\\\Rightarrow R_2=\dfrac{R_1}{\sqrt{\dfrac{M_2}{M_1}}}\\\Rightarrow R_2=\dfrac{9.31\times 10^{-4}}{\sqrt{\dfrac{28.0134}{44.01}}}\\\Rightarrow R_2=1.167\times 10^{-3}\ \text{mol/h}[/tex]

The rate of effusion of the [tex]N_2[/tex] gas would be [tex]1.167\times 10^{-3}\ \text{mol/h}[/tex].