Anyone Can help me this question ‍♂️ please ?

Answer:

In explanation.

Explanation:

Physical changes are generally changes in states of matter. So, the water going from liquid to gas is a phase change and therefore physical. (It's still water, just in a different form). Im not sure about the second piece of evidence though. Unless you are talking about the Mac and Cheese which in that case is also a physical change as the two ingredients cheese and macaroni stay the same when cooked just become softer and edible.

Answer:

3,4,5,6,7,8

Explanation:

Groups 13  - 18 are the main group on the periodic table

The group number corresponds the number of valence electrons they contains.

Valence electrons are the number of electrons in the outermost shell of an atom.

So group 13 - 18 corresponds to a valency of 3,4,5,6,7,8.

Groups with a valency of 8 are the noble gases.

Answer:

i think it would be c

Explanation:

sorry if it is wrong

Answer:

2NaClO₃ -> 2NaCl + 3O₂

Explanation:

The number of atoms in the reactants has to equal the number of atoms in the products.

Hope that helps.

Answer:

Webbed Feet

Explanation:

Webbed Feet Benefits:

Most animals with webbed feet are aquatic animals who live in, on, or near the water. Webbed feet help them move quickly through the water when they're chasing food or trying to escape from predators.

Answer:

A. catalyst.

Explanation:

Catalyst is something that causes things to decay. I think catalyst is the right answer from what i know from Miraculous Ladybug... Did you know the show was originally going to be an anime?

Answer:

2Al + 6HCl -----> 2AlCl3 + 3H2

Reaction of acid with metals

Cu(OH)2. -----> H2O. + CuO

Dissociation of coper hydroxide / dissociation of base

Explanation:

Answer: Body plans change as new challenges arise.

Explanation:

The mollusks are the invertebrate animals. They live marine environment. They live in shallow waters. They have been found in variety of marine habitats so this indicates their adaptiveness to different conditions. They have body plan that comprises of shell, mantle, radula and muscular foot that helps in survival and adaptation in different conditions. The shell and mantle are hard structures which protect these animals from predators and also help them to camouflage. Also the muscular foot helps in locomotion. Radula helps in feeding. Oysters, snails are some examples of mollusks.

Answer:

3.51m/s

Explanation:

Given parameters:

Distance   = 20miles

         Miles to meters:

             1 mile  = 1609m

              20miles  = 20 x 1609  = 32180m

Time  = 153minutes

             1 min  = 60s

           153min  = 60 x 153  = 9180s

Unknown:

Average speed  = ?

Solution:

To solve this problem;

        Average speed  = [tex]\frac{distance }{time taken}[/tex]  

         Average speed  = [tex]\frac{32180}{9180}[/tex]   = 3.51m/s

Answer:

yes

Explanation:

Answer:

wave length=speed*frequency

=36*6

=216 m

Answer:

??????????????????

Explanation:

)??

Answer:

have different properties from the elements they are made from

Explanation:

Compounds have different properties from the elements they are made from. Compounds are substances composed of two or more kinds of atoms/elements joined together in a definite grouping.

Answer:

Que?

Explanation:

Answer:

Mg(NO4)2 is 180.3 g/mol

Explanation:

First find the substance formula.

Magnesium Nitrate.

Magnesium is a +2 charge.

Nitrate is a -1 charge.

So to balance the chemical formula,

We need 1 magnesium atom for every nitrate atom.

2(1) + 1(-2) = 0

So the substance formula is Mg(NO4)2.

Now find the molar mass of Mg(NO4)2.

Mg = 24.3 amu

N = 14.0 amu

O = 16.0 amu

They are three nitrogen and twelve oxygen atoms.

So you do this: 24.3 + 14.0(2) + 16.0(8) = 180.3 g/mol

So the molar is mass is 180.3 g/mol.

The final answer is Mg(NO4)2 is 180.3 g/mol

Hope it helped!

Answer:

See explanation

Explanation:

Given that;

E = hc/λ

h = 6.63 * 10^-34 Js

c = 3 * 10^8 ms-1

λ = ?

E = 3.978 * 10^-19 J

λ = hc/E

λ = 6.63 * 10^-34 * 3 * 10^8 /3.978 * 10^-19

λ = 19.89 * 10^-26/3.978 * 10^-19

λ = 5 * 10^-7 m The colour is green

2. E = hc/λ

E=  6.63 * 10^-34 * 3 * 10^8 /1000 * 10^-9

E = 1.989 * 10^-19 J

But

E = hf

f = E/h

f =  1.989 * 10^-19/6.63 * 10^-34

f = 3 * 10^14 Hz The radiation is infrared

3. E = hc/λ

λ= hc/E

λ= 6.63 * 10^-34 *  3 * 10^8 /2.0 * 10^-14

λ= 995 * 10^-14 m This is gamma radiation

4. E = hc/λ

E=6.63 * 10^-34 *  3 * 10^8 /620 * 10^-9

E = 3.2 * 10^-19 J

5. E = hf

E= 6.63 * 10^-34 * 2 * 10^17

E = 1326 * 10^-19 J

E = hc/λ

λ= hc/E

λ= 6.63 * 10^-34 * 3 * 10^8 /1326 * 10^-19 = 15 * 10^-9

This is ultraviolet radiation

Answer:

is there a picture or something?

Explanation:

Explanation:

Your question is incomplete please update it.

Answer:

UMMMMMMMMMMM

Explanation:

Answer:

3729

Explanation:

The mole fraction of cation (Al)=0.4

Given

1 M of Aluminium sulphate​

Required

The mole fraction of cation

Solution

Ionization of the Aluminum sulfate solution( assume 1 L solution ) :

mol Al₂(SO₄)₃ = M x V = 1 M x 1 L = 1 mol

Al₂(SO₄)₃⇒2Al³⁺ + 3SO₄²⁻

1 mol          2 mol   3 mol

From this equation, total mol in solution = 2+3 = 5 moles

Mol fraction Al(as a cation) :

= 2/5=0.4

Answer:

B) Eating a antacid to calm your upset stomach.

Explanation:

Answer:

The manner in which objects will move is determined by the answer to this question. Unbalanced forces will cause objects to change their state of motion

Explanation:

Since these two forces are of equal magnitude and in opposite directions, they balance each other.

Answer:

balance force are those force whose resultant force is zero and unbalanced force are those whose resultant are non zero

Answer:

C

Explanation:

Answer:

Answer 1: The correct answer is b. convergent continental-continental boundary.

A convergent continental-continental boundary refers to a convergent plate boundary where two continental plates meet or come together. When this happens, a forceful collision occurs, and structures like mountains start to form. The Himalaya mountain range is formed as a result of the convergence of the Indian and Eurasian continental plates.

Answer 2: The correct answer is d. convergent oceanic-oceanic boundary.

Volcanic island arcs refers to a curved line of volcanoes formed from the subduction (sinking) of one oceanic plate below another plate. Examples of volcanic island arcs include Japanese Islands and Alaskan Islands

Kp/Kc = RT

Given

Reaction

A(g) ⇌ C(g)+B(g)

Required

Kp/Kc

Solution

For reaction :

pA + qB ⇒ mC + nD  

[tex]\large {\boxed {\bold {Kc ~ = ~ \frac {[C] ^ m [D] ^ n} {[A] ^ p [B] ^ q}}}}[/tex]

While the equilibrium constant Kp is based on the partial pressure  

[tex]\large {\boxed {\bold {Kp ~ = ~ \frac {[pC] ^ m [pD] ^ n} {[pA] ^ p [pB] ^ q}}}}[/tex]

The value of Kp and Kc can be linked to the formula '  

[tex]\large {\boxed {\bold {Kp ~ = ~ Kc. (R.T) ^ {\Delta n}}}}[/tex]

R = gas constant = 0.0821 L.atm / mol.K  

Δn=moles products - moles reactants or

number of product coefficients-number of reactant coefficients  

For reaction :

A(g) ⇌ C(g)+B(g)

number of product coefficients = 1+1=2

number of reactant coefficients   = 1

Δn= 2 - 1 =1

So Kp/Kc = RT

Answer:

KBr

Explanation:

A metal has a very high melting point. Aluminum is a metal.

Ionic solids do not conduct electricity in the solid state. However, when the solids are melted, they conduct electricity.

KBr is an ionic substance, it can only conduct electricity in molten form because the ions are locked up in the solid.

Answer:

436.55841 grams.

Explanation:

The molecular formula for Iron(III) Iodide is FeI3. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Iron(III) Iodide, or 436.55841 grams.

You use the 1 / 436.55841 conversion rate. This is different for each element, according to the stoichiometry tables. Iron(II) oxide would be 2/3 of the 1/436.55841 conversion rate, that is, multiplying the fraction to denominator.

Answer:

3.41 g

Explanation:

A chemist adds 260.0 mL of a 0.0832M potassium permanganate solution to a reaction flask. Calculate the mass in grams of potassium permanganate the chemist has added to the flask. Round your answer to 3 significant digits.

Step 1: Given data

Volume of the solution (V): 260.0 mL (0.2600 L)

Concentration of the solution (C): 0.0832 M (0.0832 mol/L)

Step 2: Calculate the moles (n) of potassium permanganate added

We will use the following expression.

n = C × V

n = 0.0832 mol/L × 0.2600 L = 0.0216 mol

Step 3: Calculate the mass corresponding to 0.0216 moles of potassium permanganate

The molar mass of potassium permanganate is 158.03 g/mol.

0.0216 mol × 158.03 g/mol = 3.41 g

Answer: Explain how the biogeochemical cycles are essential for life

Biogeochemical cycles are critical to the existence of life, transforming energy and matter into usable forms to support the functioning of ecosystems, as noted previously. ... Carbon is an essential element in the bodies of all living organisms and an essential source of energy for many organisms.

Answer: D

Explanation: I took the quiz! Module 04.06! Have a good day!

Answer: Water level remains same as there is no difference in concentration gradient.

Explanation: When concentration inside and outside of the cell membrane is the same, no transport takes place and the levels will remain the same.