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3 years ago

PLEASE HELP ILL GIVE BRAINLIST AND POINTS (I don’t mind how long it needs to be)

Chemistry

2 answers:

lapo4ka [179]3 years ago

3 0

Answer:

When two or more atoms chemically bond together, they form a molecule. When molecules are made from two or more different kinds of atoms, the substances are called compounds. If molecules are made from only one kind of atom, the substances are elements.

Explanation:

<em> gave an explanation in my answer XD anyway hope I helped. Have a good day!</em>

Morgarella [4.7K]3 years ago

3 0

Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.

Please mark brainliest

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Correct first answer= Brianliest!PLEASE WOULD REALLY APPRECIATE IF YOU’D HELP ME OUT:’(

sveticcg [70]

Answer:

The answer to your question is: 2 grams of methane

Explanation:

Data

V = 9.15 l

P = 1.77 atm

T = 57° C = 330 °K

Ar mass = 19 g

CH4 mass = ?

Formula

PV = nRT

Process

$n = \frac{PV}{RT}$

$n = \frac{(1.77)(9.15)}{(0.082)(330)}$

$n = \frac{16.26}{27.06}$

n = 0.6

Argon

40 g of Ar -------------------- 1 mol

19 g --------------------- x

x = 0.475 mol of Ar

moles of CH4 = 0.6 - 0.475

= 0.125

Methane

16 g of CH4 --------------- 1mol

x ---------------- 0.125 mol

x = 2 grams

3 0

3 years ago

Which of the following is an example of kinetic energy? (2 points) Select one: a. chemical energy b. gravitational energy c. nuc

Monica [59]

Thermal energy:
About to submit this quiz ill comment if I'm wrong

7 0

3 years ago

Read 2 more answers

32 Points!!! Match the definition with correct keyword.

Temka [501]

Answer: Okay so here's the order lol from top to bottom

2, 1, 3, 4, 5

Explanation:

5 0

3 years ago

CH4 with pressure 1 atm and volume 10 liter at 27°C is passed into a reactor with 20% excess oxygen, how many moles of oxygen is

BaLLatris [955]

Answer : The moles of $O_2$ left in the products are 0.16 moles.

Explanation :

First we have to calculate the moles of $CH_4$ .

Using ideal gas equation:

$PV=nRT$

where,

P = pressure of gas = 1 atm

V = volume of gas = 10 L

T = temperature of gas = $27^oC=273+27=300K$

n = number of moles of gas = ?

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

Now put all the given values in the ideal gas equation, we get:

$(1atm)\times (10L)=n\times (0.0821L.atm/mol.K)\times (300K)$

$n=0.406mole$

Now we have to calculate the moles of $O_2$ .

The balanced chemical reaction will be:

$CH_4+2O_2\rightarrow CO_2+2H_2O$

From the balanced reaction we conclude that,

As, 1 mole of $CH_4$ react with 2 moles of $O_2$

So, 0.406 mole of $CH_4$ react with $2\times 0.406=0.812$ moles of $O_2$

Now we have to calculate the excess moles of $O_2$ .

$O_2$ is 20 % excess. That means,

Excess moles of $O_2$ = $\frac{(100 + 20)}{100}$ × Required moles of $O_2$

Excess moles of $O_2$ = 1.2 × Required moles of $O_2$

Excess moles of $O_2$ = 1.2 × 0.812 = 0.97 mole

Now we have to calculate the moles of $O_2$ left in the products.

Moles of $O_2$ left in the products = Excess moles of $O_2$ - Required moles of $O_2$

Moles of $O_2$ left in the products = 0.97 - 0.812 = 0.16 mole

Therefore, the moles of $O_2$ left in the products are 0.16 moles.

7 0

3 years ago

Does this equation obey the law of conservation of mass: 2Z + 2HCI ➡️ ZnCI2 + H2

MAXImum [283]

Answer:

2Zn + 2HCI ➡️ ZnCI2 + H2

LHS of equation

Z = 2

H = 2

Cl = 2

RHS of equation

Zn = 1

Cl =2

H =2

as Zn is not equal in number of atoms on both sides of the equation, the equation does not obey the law of conservation of mass

Explanation:

the law of conservation mass states that the mass of an isolated system cannot be created nor destroyed by any chemical reaction or physical transformation. thus, there must be an equal number of atoms of an element present on both sides of the equation.

5 0

3 years ago