label each as a physical or chemical change & explain your reasoning.

Answer:

36

orrr

20

Explanation:

36 explanation:18x2=36

20 explanation:18+2=20

The volume of the object : 9 ml

Given

The density of an object : 2 g/ml

Mass : 18 g

Required

The volume

Solution

Density is a quantity derived from the mass and volume  

Density is the ratio of mass per unit volume  

Density formula:  

[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]

ρ = density  

m = mass  

v = volume

V=m : ρ

V = 18 g : 2 g/ml

V = 9 ml

320 g IF₇

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Step 1: Define

7.3 × 10²³ molecules IF₇

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of I - 126.90 g/mol

Molar Mass of F - 19.00 g/mol

Molar Mass of IF₇ - 126.90 + 7(19.00) = 259.9 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

315.056 g IF₇ ≈ 320 g IF₇

Answer:

See explanation

Explanation:

Before the advent of the wave-particle duality theory proposed by Louis de Broglie, there was a sharp distinction between mater and waves.

However, Louis de Broglie introduced the idea that mater could display wave-like properties.  Erwin Schrödinger developed this idea into what is now known as the wave mechanical model of the atom.

In this model, electrons are regarded as waves. We can only determine the probability of finding the electron within certain high probability regions within the atom called orbitals.

This idea has been the longest surviving atomic model and has greatly increased our understanding of atoms.

Answer:

Volumic mass is the density of a substance in its mass per unit volume. The symbol most often used for density is p.

The theoretical yield : = 28.34 g Al₂O₃

Given

15 g of Aluminum react

Required

The theoretical yield

Solution

Reaction

4Al(s) + 3O₂ (g)⇒ 2Al₂O₃(s)

mol of Aluminum :

mol = mass : Ar Al

mol = 15 g : 26.98 g/mol

mol = 0.556

From the equation, mol ratio of Al : Al₂O₃ = 4 : 2, so mol Al₂O₃ :

= 2/4 x mol Al

= 2/4 x 0.556

= 0.278

Mass Al₂O₃ :

= mol x MW Al₂O₃

= 0.278 x 101.96

= 28.34 g

Answer: The atom count for each element on the reactant side of a balanced chemical equation is equal to the atom count for each element on the product side of the same equation

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products formed must be equal to the mass of reactants taken.

In order to get the same mass on both sides, the atoms of each element must be balanced on both sides of the chemical equation.

[tex]2H_2+O_2\rightarrow 2H_2O[/tex]

Thus there are 4 atoms of hydrogen on reactant as well as product side.

Also there are 2 atoms of oxygen on reactant as well as product side.

Answer:

metric system

Explanation:

In the metric system, the basic unit of length is the meter. A meter is slightly larger than a yardstick, or just over three feet. The basic metric unit of mass is the gram. Finally, the basic metric unit of volume is the liter.

Answer:

yesyeysesyesyesyesteys

Answer:

4H₂O(l) → 4H₂(g) + 2O₂(g)

Balancing equations

1. 3Fe(s) + 4H₂O(g) → Fe₃0₄(s) + 4H₂(g)

2. 2AlBr₃(aq) + 3Cl₂(g) → 2AlCl₃(aq) + 3Br₂(l)

3. 2HNO₃(aq) + Ba(OH)₂(aq) → Ba(NO₃)₂(aq) + 2H₂O(l)

4. 2Al(s) + 3Pb(NO₃)₂ → 2Al(NO₃)₃(aq) + 3Pb(s)

5. 3NaOH(aq) + Fe(NO₃)₃ → Fe(OH)₃(s) + 3NaNO₃(aq)

Explanation:

From the question given, I have been able to balance the chemical equations correctly.

In balancing chemical equations, the chemical equation must have equal number of atoms for each element that are both in the reactant side and in the product side.

For the above to be achieved, the number of atoms in each element will have to be multiplied and added.

A look at the balanced chemical equation above, you will discover that each element has the same number of atoms both in the reactant side and in the product side.

Tubular organism with tentacles surrounding its mouth; a cnidarian

Hydra

SORRY I DON'T KNOW CORRECT BUT

I THOUGHT THATH THIS IS A CATEPILLAR

PLEASE THANKS THIS ANSWER

Answer:

Thunder!! Hope this helps!!

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:

Mercury

Explanation:

mercury, and it's the only metal that normally exists on Earth as a liquid.

Answer: aerobic respiration converts about 40% of the available energy of glucose into ATP!!!

The acceleration : 0.25 m/s²

Given

mass = m = 24 kg

Force = F = 6 N

Required

The acceleration

Solution

Newtons' second law :

Newton's 2nd law explains that the acceleration produced by the resultant force on an object is proportional and in line with the resultant force and inversely proportional to the mass of the object

ΣF =  m x a

[tex]\large {\boxed {\bold {a = \frac {\sum F} {m}}}[/tex]

Input the value :

6 N = 24 kg x a

a = 6 : 24

a = 0.25 m/s²

Answer:

0.25

Explanation:

its 0.25

Answer:

2. volume

Explanation:

Answer:

volume

Explanation:

Answer:

Mass and Velocity

Explanation:

hope this is the right answer might wrong tho

Answer:

its velocity and mass

Explanation:

I got it right on edg

Answer:

1) Non metals

2) The melting point increase as we go down the group.

3) The boiling point also increase as we go down the group.

4) The halogens grow darker as we move down the group.

5) The same happens for Iodine as the boiling point and melting point increase as we go down the group.

6) Bromine is more reactive than Iodine as because the size of iodine is greater than that of Bromine.

7) The size of atoms become bigger and larger.

8) Nucleus of every atoms of different elements contain neutron and proton and the nucleus is covered by shells.

9) Because they are placed vertically second from the right in the periodic table.

queries comment me!!

Answer:

1) Non metals

2) The melting point increase as we go down the group.

3) The boiling point also increase as we go down the group.

4) The halogens grow darker as we move down the group.

5) The same happens for Iodine as the boiling point and melting point increase as we go down the group.

6) Bromine is more reactive than Iodine as because the size of iodine is greater than that of Bromine.

7) The size of atoms become bigger and larger.

8) Nucleus of every atoms of different elements contain neutron and proton and the nucleus is covered by shells.

9) Because they are placed vertically second from the right in the periodic table.

Explanation:

Answer:2097.5998675091255

Explanation:

Answer:

It is a solid or gas

Explanation:

solid or gas flow to the bottom of its container

Answer:

b

Explanation:

im doing a test about it

Answer:

b

Explanation:

Volume of solution : = 3083.3 ml = 3.0833 L

Given

a 6.0% w/v

185 g of glucose

Required

Volume of solution

Solution

% w/v : the mass of solute in a volume of solution or 1 g solute in 100 ml of solution

Can be formulated :

% w/v = (mass solute(g) : volume solution(ml)) x 100

Mass of solute = mass of glucose = 185 g

The volume of solution :

= 185 g : 0.06

= 3083.3 ml

= 3.0833 L

Answer:

C

Explanation:

Fluorine has a smaller atomic radius than oxygen.

hydrogen, helium, oxygen, nitrogen, argon, neon, fluorine, chlorine, krypton, xenon and radon i believe >__< not in any order ahaha

Answer:

hydrogen, helium, oxygen, nitrogen, argon and neon, fluorine, chlorine, krypton, xenon and radon

Explanation:

Answer:

Helium Nucleus

Explanation:

Answer:

Helium Nucleus

Explanation:

Answer:

it would become darker. there would be a higher level of water pressure. and there would be less animals, or different alimals.

Answer: Geotropism allows the plants to correctly orient themselves for growth.

Explanation: