Suppose 4.0 g of hydrogen reacts completely with 32.0 g of oxygen to form one product what is the mass of the product?

Answer:

The number of electrons in the outermost shell of an atom determines its reactivity.

Explanation:

Answer:

The number of electrons in the outermost shell of an atom determines its reactivity. Noble gases have low reactivity because they have full electron shells. Halogens are highly reactive because they readily gain an electron to fill their outermost shell.

Explanation:

Answer:

graph a shows acceleration and b does not

Explanation:

the velocity increases in graph a, but stays constant in graph b

Answer:

graph a shows acceleration and b does not

Explanation:

Answer: Water as its the universal solvent

Answer:

1.8×10²² atom of Rn contain 0.03 moles of Rn.

Explanation:

Given data:

Number of atoms of Rn = 1.8×10²² atoms

Number of moles = ?

Solution:

we will solve this problem through Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

For example,

1 mole of Rn = 6.022 × 10²³ atoms of Rn

1.8×10²² atoms of Rn × 1mol /  6.022 × 10²³ atoms of Rn

0.3×10⁻¹ moles of Rn

0.03 moles of Rn

Answer:

will i think the 21.0cm

Answer: I believe the answer is A

Answer:

A- Speed = distance/time

Explanation:

Would make sense and that's what I remember

Answer:

O nome "transição" vem da posição dos elementos na tabela, representando a transição do grupo 2 ao 13, pela sucessiva adição de elétrons ao orbital d. Elementos de transição externa (ou somente elementos de transição):

Answer:

Yes

Explanation:

It was Dmitri Mendeleev, a Russian chemist and teacher.

Answer:

No, it wasn't. On Feb.17 in 1869, a very intelligent Russian professor of chemistry, Dimitri Ivanovich Mendeleev created his first part of the periodic table. I hope that helps you.

Explanation:

Answer:

a)

[SO2]: The concentration increases

[O2]: The concentration increases.

[SO3]: The concentration decreases.

b)

[SO2]: The concentration decreases.

[O2]: The concentration decreases.

[SO3]: The concentration increases.

c)

[SO2]:There is no change.

[O2]: There is no change.

[SO3]: There is no change

Explanation:

For an exothermic reaction, increase in temperature decreases the concentration of products and increases the concentration of reactants since increase in temperature shifts the equilibrium position to the left hand side.

Increase in pressure and decrease in volume will shift the equilibrium position towards the right hand side which means more SO3 in the system.

Catalyst increases the rate of forward and reverse reaction simultaneously hence at equilibrium, the concentration of reactants and products remain unchanged.

Answer:

25.6 Explanation:

Answer:

Explanation:

The percentage error of a certain measurement can be found by using the formula

[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]

From the question

actual mass = 35 g

error = 35 - 33.95 = 1.05

We have

[tex]p(\%) = \frac{1.05}{35} \times 100 \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

The moon

Explanation:

The moon pulls on the earth, causing the tides to raise as the water is being pulled by the moon.

Answer:

Amount = 0.0027 mol

Explanation:

The molecular formula of vitamin C is: C₆H₈O₆. Therefore, its molar mass will be:

Molar Mass = 6(Mass of carbon) + 8(Mass of Hydrogen) + 6 (Mass of Oxygen)

Molar Mass = 6(12 g/mol) + 8(1 g/mol) + 6(16 g/mol)

Molar Mass = 176 g/mol

Molar Mass = 176000 mg/mol

Now, for the amount of Vitamin C in 1 tablet

Amount = Mass of Tablet/Molar Mass

Amount = (475 mg)/(176000 mg/mol)

Amount = 0.0027 mol

Answer:

b solution

Explanation:

Answer:

Number of molecules = 2.61  x 10²³

Explanation:

Given:

Volume of tetra-chloride = 42 ml

Density = 1.59 g/ml

Find:

Number of molecules

Computation:

Mass = Volume of tetra-chloride x Density

Mass = 42 x 1.59

Mass = 66.78

Molecular mass of tetra-chloride = 154 g/mol

Moles = 66.78 / 154

Moles = 0.4337

0.4337 mole = 0.4337 x Avogadro number

0.4337 mole = 0.4337 x 6.022 x 10²³

Number of molecules = 2.61  x 10²³

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 500 kg

volume = 0.026 m³

We have

[tex]density = \frac{500}{0.026} \\ = 19230.769230...[/tex]

We have the final answer as

Hope this helps you

Answer:

Human activities are at the root of this phenomenon.

Explanation:

Answer:

The given metal sample is not aluminum because its density is 3.0 g/cm³ while density of aluminum is  2.7 g/cm³.

Explanation:

Given data:

Density of aluminum = 2.7 g/cm³

Mass of metal sample = 52.0 g

Volume of metal sample = 17.1 cm³

which sample is that = ?

Solution:

The given problem will be solve through density formula.

d = m/v

d = density

m = mass

v= volume

Now we will put the values in formula.

d = 52.0 g/ 17.1 cm³

d = 3.0 g/cm³

It is given in question the density of aluminum is 2.7 g/cm³. The given metal sample is not aluminum because its density is 3.0 g/cm³.

Answer:

Enery transformation is when a forn of energy changes into another.

Explanation:

An example of this would be a lamp. The lamp gets its energy through electricity. This electricity is later turned into light energy. Electrical energy to light evegy.

Answer:

The nitrogen atom has 5 electrons in the outermost shell, so it can accept 3 electrons to fulfil the octet structure. Therefore the valency of nitrogen is 3.

Answer:

1.7

Explanation:

The formula to be used here is;

pH = -log[H⁺]

To determine the concentration of H⁺ of the nitric acid (HNO₃), formula for molarity is used

Molarity = number of  moles/volume (in dm³ or L)

number of moles (n) = given mass/molar mass

Molar mass of HNO₃ = 1 + 14 + (16 x 3)

= 63g

given mass (in grams) = 320mg⇔0.32g (where 1000mg = 1g)

Thus; n = 0.32/63

n = 0.0051 moles

Volume of acid = 290 mL ⇔ 0.29 L (where 1000 mL = 1L)

Molarity = n/volume;

0.0051/0.29

Molarity = 0.018M

pH = -log 0.018

pH = 1.7

The elements in a group containing similar physical properties are

Pair 1 -- K and Li

Pair 2 -- S and Te

Pair 3 -- Br and F

To learn more periodic properties visit:

brainly.com/question/2396573

#SPJ1

Given parameters:

Heat of fusion of water  = 334j/g

Mass of ice  = 45g

Temperature of ice =  0.0°c

Unknown:

Amount of heat needed to melt = ?

Solution:

This is simply a phase change and a latent heat is required in this process.

  To solve this problem; use the mathematical expression below;

             H  = mL

where m is the mass

            L is the heat of fusion of water;

              H  = 45 x 334  = 15030J

Answer: the igneous intrusion is 325 million years old

Explanation:

In the sample of the igneous intrusion

Number of Potassium-40 atoms (parent atom) = 1682

Number of Argon-40 atoms (daughter atom) = 318

Half-life of the Potassium40- Argon40 radioactive pair = 1.3 billion years = 1.3 × 10⁹ years

We now want to know the absolute age of the igneous intrusion.

At t = 0

i.e. when the igneous intrusion took place there will be no daughter atom (Ar-40).

So the number of parent (K-40) will be 1682 + 318 = 2000 atoms

Total number of atoms = parent + daughter = 2000 + 0 = 2000

Now after a given time

Number of Parent atom (K-40) = 1682

Number of Daughter atom (Ar-40) = 318

percent of parent atom (K-40)

= (Number of parent atom / total number of atoms) × 100

= (1682/2000) × 100

= 84.1 %

percentage of daughter atom (Ar-40) = 100 - % of K-40 atoms

= 100 – 84.1

= 15.9 %

Now from the table of “decay parameters for all radioactive decay pairs”  which is uploaded along this answer

When Parent atom = 84.1 % and daughter atom = 15.9 %

then Age is given as 0.250T_1/2

THEREFORE  age of the igneous intrusion

= 0.250 × 1.3 × 10⁹ years

= 0.325 × 10⁹ years

= 325 million years.

SO the igneous intrusion is 325 million years old

The appearance and physical states of the material given is described below please look at it.

Baking soda: It is a white solid.

Salt: it is white in color having a solid physical state.

Sugar: It is white in color having crystals or solid in physical state.

Flour: It is creamish white in color having solid particles.

Vinegar: It is transparent in color.

Cooking oil: It is a yellowish emulsion.

Find more information about Solid state here:

brainly.com/question/13503697

Answer:

a. First order.

b. [tex]k=3.7x10^{-3}s ^{-1}[/tex]

c. [tex]t_{1/2}=187.3s[/tex]

d. [tex][A]=0.111M[/tex]

Explanation:

Hello.

a. In this case since the slope is in s⁻¹ we can infer that the lineal form of the rate law is:

[tex]ln[A]=-kt+ln[A]_0[/tex]

Which is also:

[tex]y=mx+b[/tex]

It means that the reaction is first-order as slope equals the negative of the rate constant which also has units of first-oder reaction.

b. Since the slope is −3.7 x 10−3 s−1 the rate constant is:

[tex]k=-m\\\\k=-(-3.7x10^{-3}s ^{-1})\\\\k=3.7x10^{-3}s ^{-1}[/tex]

c. For first-order reactions, the half-life is:

[tex]t_{1/2}=\frac{ln(2)}{k}\\ \\t_{1/2}=\frac{ln(2)}{3.7x10^{-3}s^{-1}}\\\\t_{1/2}=187.3s[/tex]

d. In this case, since the integrated first-order rate law is:

[tex][A]=[A]_0exp(-kt)[/tex]

The concentration once 220 seconds have passed is:

[tex][A]=0.250Mexp(-3.7x10^{-3}s^{-1}*220s)\\\\[/tex]

[tex][A]=0.111M[/tex]

Regards.