Suppose you mix Na2SO4 and KCl solutions according to the given equation.
Na2SO4 (aq) + 2 KCl(aq) + 2 NaCl(aq) + K2SO4 (aq)
What evidence of a reaction do you expect to see?
Select one:
A precipitate should form.
A gas should form.
Water should form.
Ο Ο
No reaction should occur.

Answer:

Al2O3 + 3Cl2 + 3 C → 2 AlCl3 + 3 CO

Explanation:

Answer:

D

Explanation:

The nucleus was postulated as small and dense to account for the scattering of alpha particles from thin gold foil, as observed in a series of experiments performed by undergraduate Ernest Marsden under the direction of Rutherford and German physicist Hans Geiger in 1909.

Answer: Europe

Explanation: it’s in germany

Answer: Gravity

Explanation:

A PE X

Answer:

25 mL

Explanation:

Step 1: Given data

Step 2: Calculate the volume of the concentrated NaCl solution

We will use the dilution rule.

C₁ × V₁ = C₂ × V₂

V₁ = C₂ × V₂ / C₁

V₁ = 0.1 M × 0.500 L / 2 M

V₁ = 0.025 L = 25 mL

Answer:

A consumer

Explanation:

Organisms, such as plants, that produce their own food by methods such as photosynthesis are called producers.

Organisms that need to consume other organisms as their food source, including all animals, are consumers. Some consumers consume plants (primary consumers, or herbivores) but other consumers eat other consumers (secondary consumers, or carnivores)

Answer:

124.56 moles of Hydrogen atoms.

Explanation:

We'll begin by calculating the number of moles of ethane that contains 1.25×10²⁵ molecules. This can be obtained as follow:

From Avogadro's hypothesis, 1 mole of any substance contains 6.02x10²³ molecules. This implies that 1 mole of ethane also contains 6.02x10²³ molecules.

Thus, 6.02x10²³ molecules are present in 1 mole of ethane.

Therefore, 1.25×10²⁵ molecules are present in = 1.25×10²⁵/6.02x10²³ = 20.76

Therefore, 20.76 moles of ethane contains 1.25×10²⁵ molecules.

Finally, we shall determine the number of mole of Hydrogen in 20.76 moles of ethane. This can be obtained as follow:

Ethane has formula as C2H6.

From the formula, 1 mole of ethane, C2H6 contains 6 moles of Hydrogen atoms.

Therefore, 20.76 moles of ethane will contain = 20.76 × 6 = 124.56 moles of Hydrogen atoms.

Therefore, 1.25×10²⁵ molecules of ethane contains 124.56 moles of Hydrogen atoms.

Explanation:

ur answer okkkkkkkkkkkkkkkkll

Answer:

Atoms consist of a nucleus made of protons and neutrons orbited by electrons. Atoms are the basic units of matter and the defining structure of elements. The term "atom" comes from the Greek word for indivisible, because it was once thought that atoms were the smallest things in the universe and could not be divided

Explanation:

Answer:

Matter is classified into two broad categories, namely, pure substances and mixtures. Mixtures can be separated into pure substances by physical methods. Pure substances are further divided into categories as elements and compounds. ... A pure substance can be either an element or a compound.

Explanation:

Answer:

The answer is

Explanation:

To find the number of entities or particles given the number of moles of a substance we use the formula

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question

n = 3.4 mol

We have

N = 3.4 × 6.02 × 10²³

We have the final answer as

Hope this helps you

Answer:

Argon-40

the reason this is abundent is because this is a more common isotope

Explanation:

Answer:

option c

Explanation:

neutros equal to mass num - atomic num

An atom can be defined by its properties:

An isotope is represented by the general notation of [tex]_Z^A\textrm{Y}[/tex], where X is the symbol of an element.

Mass number = Numer of protons + Number of neutrons

Put the value in the above formula.

[tex]\Rightarrow \text{Mass number}=3+5[/tex]

[tex]\Rightarrow \text{Mass number}=8[/tex]

The isotopic representation of the chemical specie is [tex]_3^8\textrm{Li}[/tex]. So, the correct option is C.

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A crest of a wave with an amplitude of 5 meters intersects the through of another wave with an amplitude of 2 metre . the resulting amplitude is

A. 3 meters

The resultant amplitude will be 7 meters.

We have crests of two different waves.

We have to find the resulting amplitude when both the waves intersect.

A crest point on a wave is the maximum value of upward displacement within a cycle.

According to the question -

Amplitude of wave 1 = 5 meters.

Amplitude of wave 2 = 2 meters.

Assuming that both waves are in phase, when the two waves which are

in-phase interfere, they interfere constructively. The final amplitude will be -

A(f) = A[1] + A[2] = 5 + 2 = 7 meters.

Hence, the resultant amplitude will be 7 meters.

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Answer:

Volume of hydrogen gas formed = 3.1 L

Explanation:

Given data:

Mass of magnesium = 3.00 g

Temperature = room = 27°C (27+273 = 300 K)

Pressure = 1 atm

Volume of hydrogen gas formed = ?

Solution:

Chemical equation:

Mg + H₂SO₄    →       MgSO₄ + H₂

Number of moles of Mg:

Number of moles = mass/molar mass

Number of moles = 3.00 g/ 24 g/mol

Number of moles = 0.125 mol

Now we will compare the moles Mg with hydrogen.

                    Mg             :             H₂

                     1                :              1

                   0.125          :          0.125

Volume of hydrogen:

PV = nRT

1 atm × V = 0.125 mol  ×  0.0821 atm.L /K.mol × 300 k

V = 3.1atm.L/1 atm

V = 3.1 L

Answer:

Protons carry a positive electrical charge and they alone determine the charge of the nucleus. Adding or removing protons from the nucleus changes the charge of the nucleus and changes that atom's atomic number. For example, adding a proton to the nucleus of an atom of hydrogen creates an atom of helium.

i hope this helps!

Answer: A homogeneous mixture is a solid, liquid or gaseous mixture that has the same proportions of its components throughout any given sample.

Explanation:

A homogeneous mixture is composed of different parts that are indistinguishable in their color, texture, or appearance.

The extent of the elements' mixing together and the uniformity of their composition distinguish heterogeneous mixtures from homogeneous ones.

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Answer:11.35 g/cm 3

Explanation:

Length

= 2.0 dm = 20 cm

Breadth

= 8.0 cm

Height

= 35 mm = 3.5 cm

Volume of block

V = ℓ ⋅ b ⋅ h = 20 cm × 8.0 cm × 3.5 cm = 560 cm

3

Density of lead is

Density

=

Mass

Volume

=

6356 g

560 cm

3

=

11.35 g/cm

3

Explanation:

Answer:

37548.55

Explanation:

3.7500*10^4+9.7100*5

3.7500*10000+9.7100*5

37500+48.55

37548.55

Answer:

We are given the following equation:

C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g)

we can see that the number of moles of H2O is 4/3 time the moles of CO2

So, the easiest way to find the number of moles of H2O is to find the number of moles of CO2 and multiply it by 4 / 3

Moles of CO2:

Molar mass of CO2 = 44 grams / mol

Moles of CO2 = Given mass / Molar mass

Moles of CO2 = 16.3 / 44 moles

Moles of H2O:

Moles of H2O = Moles of CO2 * 4 / 3

Moles of H2O = 16.3 * 4 / 3 * 44

Moles of H2O = 16.3 / 3 * 11

Moles of H2O = 16.3 / 33

Moles of H2O = 0.5 moles (approx)

Therefore, along with 16.3 grams of CO2, 0.5 moles of H2O will also be formed

Answer:

I think it is liquid's only.

Explanation:

Answer:

Liquids only i am not sure but i think its A

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

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

From the question

mass = 123 g

density = 12.8 g/mL

We have

[tex]volume = \frac{123}{12.8} \\ = 9.609375...[/tex]

We have the final answer as

Hope this helps you

Answer:

It is the second answer; A dark solid formed on the zinc.

Explanation:

This is the correct answer because when a solid is formed it is called a precipitate, which is commonly known as a chemical reaction.

The evidence that supports the student's inference is a dark solid formed on the zinc.

When zinc is added to copper sulphate (CuSO4) solution, due to more reactivity of zinc, copper is replaced by zinc and forms zinc sulphate precipate.

Thus, the student is correct, there will be a chemical reatcion between the zinc and  copper sulphate (CuSO4) solution, producing a dark solid substance.

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Answer: A

Explanation:

it had wings that flapped, similar to birds' wings.

Answer:

Bromine

Explanation:

Cuz it has bro in it :)

Answer:

120876

Explanation:

Answer:

1.62 g of Al contain the same number of atoms as 6.35 g of cadmium have.

Explanation:

Given data:

mass of cadmium = 6.35 g

Number of atoms of aluminum as 6.35 g cadmium contain = ?

Solution:

Number of moles of cadmium = 6.35 g/ 112.4 g/mol

Number of moles of cadmium = 0.06 mol

Number of atoms of cadmium:

1 mole = 6.022×10²³ atoms of cadmium

0.06 mol × 6.022×10²³ atoms of cadmium/ 1mol

0.36×10²³ atoms of cadmium

Number of atoms of Al:

Number of atoms of Al = 0.36×10²³ atoms

1 mole =  6.022×10²³ atoms

0.36×10²³ atoms × 1 mol   /6.022×10²³ atoms

0.06 moles

Mass of aluminum:

Number of moles = mass/molar mass

0.06 mol = m/ 27 g/mol

m = 0.06 mol ×27 g/mol

m = 1.62 g

Thus, 1.62 g of Al contain the same number of atoms as 6.35 g of cadmium have.

Answer:

Change in temperature = ΔT = 26.8°C

Explanation:

Given data:

Heat absorbed = 600 j

Mass = 25.0 g

Specific heat capacity = 0.897j /g°C

Change in temperature = ΔT= ?

Solution:

Formula:

q = mcΔT

600 j =  25.0 g ×0.897 j/g°C×ΔT

600 j =  22.425 j/°C×ΔT

ΔT = 600 j /22.425 j/°C

ΔT = 26.8°C