Calculate the following:)​

Answer:

Nope, not a chemical change.

Explanation:

i hope this helps ok bye luv!!!!!!!!!!!!!!!!!!!!

Answer:

New pressure = 7.51 atm

Explanation:

Given that,

Initial pressure, P₁ = 4.5 atm

Initial temperature, T₁ = 100°C = 100+273 = 373 K

Final temperature, T₂ = 350°C = 350 + 273 = 623 K

We need to find the new pressure. Using the below relation as follows :

[tex]\dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}\\\\P_2=\dfrac{P_1T_2}{T_1}\\\\P_2=\dfrac{4.5\times 623}{373}\\\\P_2=7.51\ atm[/tex]

So, the new pressure is 7.51 atm.

Answer:

Mg (NO3)2+ K2CO3 ⇒ Mg CO3 + KNO3

Mg=1 ,N =2, O =6 +3 9 ,K =2 ,C=1 ,  (reactant side)

Mg =1, C = 1  ,O = 3+3 = 6 , K= 1., N =1 (product side)

Mg(NO3)2 + K2CO3  ⇒ Mg CO3 + 2KNO3

Mg =1 , C = 1, O =3+6=9, K = 2 IN product side

ANS:

Mg (NO3)2 +K2CO3 ⇒ MgCO3 +2 KNO3

Explanation:

Answer:

The molecular formula lists the symbol of each element within the compound followed by a number (usually in subscript). The letter and number indicate how many of each type of element are in the compound. If there is only one atom of a particular element, then no number is written after the element.

Answer:

We learn in school that matter is made of atoms and that atoms are made of smaller ingredients: protons, neutrons and electrons. Protons and neutrons are made of quarks, but electrons aren’t. As far as we can tell, quarks and electrons are fundamental particles, not built out of anything smaller.

Answer:

The recent discovery declared that the finding is very close to the ultimate particle called Higgs particle. This is believed to be the basic building block of the universe.

Explanation:   hope this help

Answer:

The mass is 20, 89 grams of He.

Explanation:

We calculate the weight of 1 mol of He, from the atomic weight of each element obtained from the periodic table: Weight 1 mol He= 4, 0020602 g. 1 mol He-----4, 0020602 g. 5,22 mol He---x= (5,22 mol He x4, 0020602 g)/ 1 mol He= 20, 89 g

hope this helps also can i get brainliest

The mass of 5.22 mol of He will be 20.84 grams.

We have 5.22 mol of He.

We have to calculate its Mass.

Helium is a chemical element with the symbol He and atomic number 2. It is a gas which is colorless, odorless, tasteless, non-toxic, inert and monatomic.

According to the question -

Number of moles of Helium = 5.22 mol

Now, I mole of Helium will have its mass equal to its Atomic weight. Therefore -

Mass of 1 mole of He = 4.002602 g

So, the mass of 5.2 mol of He will be = 5.2 x 4.002602 = 20.84 grams

Hence, the mass of 5.22 mol of He will be 20.84 grams.

To solve more questions on Mole concept, visit the link below-

https://brainly.com/question/15374113

#SPJ2

Answer:

The higher the temperature the faster the air molecules move. / The lower the temperature the slower the air molecules move.

Explanation:

Both answers work. Higher temp = more energy = moving faster, and the opposite applies. Lower temp = less energy = moving slower.

Answer:

17.21°C

Explanation:

Using the following formula;

Q = m × c × ∆T

Where;

Q = amount of heat in joules

m = mass of substance in grams

c = specific heat capacity of water (4.184 J/g°C)

∆T = final temperature - initial temperature

According to the information provided in this question,

Q = 1,785 cal

1 cal = 4.184 J

1785 cal = 7468.4J

m = 343grams

c = 4.18J/g °C

initial temperature = 12°C

Using Q = m × c × ∆T

7468.4 = 343 × 4.18 × (T - 12)

7468.4 = 1433.74(T - 12)

7468.4 = 1433.74T - 17204.88

7468.4 + 17204.88 = 1433.74T

24673.28 = 1433.74T

T = 24673.28 ÷ 1433.74

T = 17.21°C

Answer:

Explanation:

its a compound

Answer:

A

Explanation:

It's smaller hole

Answer:

I would say A.

Explanation:

Similar to Cohesion, adhesion is the attraction between molecules of different substances . Water uses adhesion when it's attraction to another substance is greater than the water's attraction to itself. if you have ever dropped a cup of water on a hardwood floor,you know that it spreads out instead of foaming beads.

Answer:

we need the picture

Explanation:

Answer:HNO3 + Al(OH)3 → Al(NO3)3 + H2O

Word equation: Nitic acid + Aluminum hydroxide → Aluminum nitrate + water

Type of Chemical Reaction: For this reaction we have a neutralization reaction.

Balancing Strategies: In this neutralization reaction we have HNO3 reacting with Al(OH)3.

Be sure to carefully count the O and H atoms on both sides of the equation, otherwise this will be a difficult equation to balance.

Hint 1

Start by balancing the N atoms.

Hint 2

Next balance the H atoms.

This is the balence form of it

3HNO3+ Al(OH)3 = Al(NO3)3 +3H2O

Explanation:

Answer:

no. Because there is always that one person who doesn't want to

Answer:

C I believe

Explanation:

Answer:

Explanation:

The valency of chlorine is 1 .It means that chlorine has seven valence electrons in its valence shell so it gains one electron from others to be stable during chemical reaction. so its valency is 1.

hope it helps :)

Answer:

294mL

Explanation:

We can use this equation to find the unknown volume:

[tex]P_1V_1=P_2V_2[/tex]

To solve, plug in the values we have and solve for the unknown value:

[tex](1.10atm)(507mL)=(1.90atm)V_2\\\frac{(1.10atm)(507mL)}{1.90atm} =V_2\\V_2=293.53mL[/tex]

Rounding to three significant figures gives you the value of 294mL

Answer:

Latitudes are used to indicate a precise location of any feature on the earth's surface.

Temperature changes with latitudes .At higher latitudes, the Sun's rays are less direct. The farther an area is from the Equator, the lower its temperature. At the poles, the Sun's rays are least direct.Near the equator sun's rays are perpendicular resulting into very high temperatures. Generally, around the world, it gets warmer towards the equator and cooler towards the poles.

Answer:

I think its the length of its year

Answer:

the length of its year

Explanation:

Answer:

F,Cl,N,I,Se,H

Explanation:

polarity increases as electronegativity increases i guess so that is supposed to be the answer

Answer:

D) red litmus turns blue​

Explanation:

Took this test, hope it helps! :)

Answer:

if im not mistaken that's a jetstream

Answer:heat-,7

Explanation:According to table P, heat- is an organic prefix used to represent 7 carbon atoms

Hept-7 is an organic prefix matched with the number of carbon atoms that it represents.

The correct option is A.

The prefix is the words that are attached prior to the words to modify their meaning.

In organic chemistry, prefixes are added to show the number of carbon present in any compound.

Hepta is used for 7, the same Octa is for eight, Penta is for five, Hexa is for six, and so on.

Thus, the correct option is A, Hept-7.

Learn more about organic prefix

https://brainly.com/question/14161952

Answer:

15 L

Explanation:

From the question given above, the following data were obtained:

Initial volume (V₁) = 10 L

Initial pressure (P₁) = 1140 torr

Final pressure (P₂) = 1 atm

Final volume (V₂) =?

Recall:

1 atm = 760 torr

The new (i.e final) volume of the gas can be obtained as follow:

Initial volume (V₁) = 10 L

Initial pressure (P₁) = 1140 torr

Final pressure (P₂) = 760 torr

Final volume (V₂) =?

P₁V₁ = P₂V₂

1140 × 10 = 760 × V₂

11400 = 760 × V₂

Divide both side by 760

V₂ = 11400 / 760

V₂ = 15 L

Therefore, the new volume of the gas is 15 L

Answer:

True.

Explanation:

When water is decomposed into hydrogen and oxygen, chemical bonds are broken, chemical energy is released, and two new substances are formed from one.

c. H-I>Se-N>Cl-F

that is the answer i think...

Explanation:

The two half equations are;

3e + HNO3 → NO

S→ H2SO4 + 6e

When balancing half equations, we have to make sure the number of electrons gained is equal to the number of electrons lost.

Which factor will you use for the top equation?

We multiply by 2 to make the number of electrons =  6e

Which factor will you use for the bottom equation?

We multiply by 1 to make the number of electrons = 6e

Answer:

2

1

Explanation: