What is the mass of 2.9 moles of calcium? Explain please

Answer:

Here are a few more examples:

Smoke and fog (Smog)

Dirt and water (Mud)

Sand, water and gravel (Cement)

Water and salt (Sea water)

Potassium nitrate, sulfur, and carbon (Gunpowder)

Oxygen and water (Sea foam)

Petroleum, hydrocarbons, and fuel additives (Gasoline)

Heterogeneous mixtures possess different properties and compositions in various parts i.e. the properties are not uniform throughout the mixture.

Examples of Heterogeneous mixtures – air, oil, and water, etc.

Examples of Homogeneous mixtures – alloys, salt, and water, alcohol in water, etc.

Explanation:

Answer:

smog,mud, cement?

Explanation:

Smoke and fog (Smog)

Dirt and water (Mud)

Sand, water and gravel (Cement)

Answer:

[tex]\boxed {\boxed {\sf +4}}[/tex]

Explanation:

Lead (Pb) has 2 positive oxidation states, +4 and +2.

Sulfur (S) has 3 oxidation states: +6, +4, and -2. Since lead creates a positive ion, sulfur must be a negative ion to balance the charges.

There are 2 atoms of sulfur, each with a charge of -2. Therefore, their overall charge is -4, because 2* -2= -4.

A compound has a net charge of 0. To achieve this, lead must have a charge of +4 to balance out the -4 charge of sulfur.

Lead has a +4 ionic charge in PbS₂

Answer:

0.0986M is the concentration of the Na₂S₂O₃ solution

Explanation:

Potassium iodate, KIO₃, reacts with sodium thiosulfate, Na₂S₂O₃, as follows:

KIO₃ + 6Na₂S₂O₃ +5KI + 3H₂SO₄ → 3H₂O + 3K₂SO₄ + 3Na₂S₄O₆ + 6NaI

To solve this question we must find the moles of sodium thiosulfate that reacts as follows:

Moles KIO₃:

0.0250L * (0.0100mol / L) = 2.5x10⁻⁴moles KIO₃

Moles Na₂S₂O₃:

2.5x10⁻⁴moles KIO₃ * (6mol Na₂S₂O₃ / 1mol KIO₃) = 1.5x10⁻³ moles Na₂S₂O₃

Molar concentration:

1.5x10⁻³ moles Na₂S₂O₃ / 0.01521L =

Answer:

it's easy u just have to put them in a calculator the way they are it will give you your answer atleast I think so hope this helps

Answer:

By strengthening the weak coral that is on the reef.

Answer: To encourage plants and animals to set up homes there to increase biodiversity.

Answer:

I guess it WATER

Answer:

a baseball soaring through the air

Explanation:

According to the passage, “Work occurs whenever something is moved and an object is put into motion.” A baseball soaring through the air is an object in motion.

An example of a situation where work occurs is a baseball soaring through the air. Therefore, option D is correct.

Work is defined as the energy that is applied to or removed from an object by applying force along a displacement. In its simplest form, it equals the product of the force's magnitude and the distance traveled for a constant force directed in the same direction as the motion.

Inertia law. Its name derives from an object's propensity to resist any change in motion up until an out-of-balance force acts on it.

A force that opposes motion is friction. Friction occurs when two moving objects come into touch and operates in the opposite direction.

The angle between force and displacement determines the kind of work that is done. Positive work occurs when a force is applied and an object is moved in that direction.

Thus, option D is correct.

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Answer:

The metamorphic rock and sedimentary rock were already at this location and magma flowed into other rocks

Explanation:

Answer:

[tex]Ka=4.71x10^{-4}[/tex]

Explanation:

Hello there!

In this case, according to the Henderson-Hasselbach equation, it is possible to write:

[tex]pH=pKa+log(\frac{[A^-]}{[HA]} )[/tex]

Next, since we are given the pH and the [A–]/[HA] ratio, we can solve for the pKa as shown below:

[tex]pKa=pH-log(\frac{[A^-]}{[HA]} )[/tex]

Now, we plug in the values to obtain:

[tex]pKa=3.92-log(0.41 )\\\\pKa=3.33[/tex]

Next, Ka is:

[tex]Ka=10^{-pKa}=10^{-3.33}\\\\Ka=4.71x10^{-4}[/tex]

Best regards!

Answer: 1.00×10^26=1000×10^23

1000×10^23/6.022×10^23=166.05×10^23 moles of water.

HOPE IT HELPS ☺️

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Explanation:

Answer:

What is the key difference between gases and liquids? EZZZZZ. The particles in a liquid are attracted to one another; the particles in a gas *are not attracted *.

Explanation:

Info gathered by site below:

Liquids

denser than gases

have a definite volume

attractive forces not strong enough to keep molecules from moving allowing liquids to hold shape of container

Thanks to:

Source: https://chem.libretexts.org/Bookshelves/General_Chemistry/Map%3A_Chemistry_-_The_Central_Science_(Brown_et_al.)/11%3A_Liquids_and_Intermolecular_Forces/11.S%3A_Liquids_and_Intermolecular_Forces_(Summary)

So dont thank me. thank the website.

Answer:

Explanation:

i think the anwer would be that its elliptical orbit and the tilt an its axis.

Answer:

C and B are the correct answers

Answer:

it is logic: everybody

Explanation:

that's the song

Answer:

The claim is incorrect because the exact position of matter is always visible or can be determined.

Answer:

Mars and jupiter

Explanation:

Similarities

-both circle the sun

-both have atmospheres

- both have moons

Differences

-mars is red and rocky

-jupiter is the largest planet

-mars is most like our earth

- jupiter has rings

Answer:

A

Explanation:

Answer:

an ecosystem

Explanation:

it compromises of living and non living things in an environment.

Answer:

pH = 9.475

Explanation:

Hello there!

In this case, according to the basic ionization of the hydroxylamine:

[tex]HONH_2+H_2O\rightarrow HONH_3^++OH^-[/tex]

The resulting equilibrium expression would be:

[tex]Kb=\frac{[HONH_3^+][OH^-]}{[HONH_2]} =1.1x10^{-8}[/tex]

Thus, we first need to compute the initial concentration of this base by considering its molar mass (33.03 g/mol):

[tex][HONH_2]_0=\frac{1.34g/(33.03g/mol)}{0.500L} =0.0811M[/tex]

Now, we introduce [tex]x[/tex] as the reaction extent which provides the concentration of the hydroxyl ions to subsequently compute the pOH:

[tex]1.1x10^{-8}=\frac{x^2}{0.0811-x}[/tex]

However, since Kb<<<<1, it is possible to solve for [tex]x[/tex] by easily neglecting it on the bottom to obtain:

[tex]x=[OH^-]=\sqrt{1.1x10^{-8}*0.0811}= 2.99x10^{-5}[/tex]

Thus, the pOH is:

[tex]pOH=-log(2.99x10^{-5})=4.525[/tex]

And the pH:

[tex]pH=14-4.525\\\\pH=9.475[/tex]

Regards!

Answer:

2.49 M

Explanation:

Step 1: Given data

Step 2: Calculate the moles AlCl₃ (solute)

The molar mass of AlCl₃ is 133.34 g/mol.

150. g × 1 mol/133.34 g = 1.12 mol

Step 3: Calculate the molar concentration of AlCl₃

Molarity is equal to the moles of solute divided by the liters of solution.

M = 1.12 mol/0.450 L = 2.49 M

Answer:

Glow sticks  and match would be light emission, slime would be preciptate, and cookies would be gas.

Explanation:

QWERTYUIOPASDFGHJKLZXCVBNM

Answer:

Explanation

The energy exists in many different forms. Each form of energy can be converted or changed into the other forms. The geothermal energy denotes the thermal energy.

The energy produced from the sun is called the solar energy. The heat and light which come from the sun is the solar energy. The solar energy play an important role in reducing the emissions of green house gases and also control the climate change.

The biomass is known as the fuel obtained from the organic matter waste of the living organisms such as plant waste, animal waste and municipal wastes. It is the fuel developed from plants.

The hydropower is the largest source of renewable energy which uses the moving water to produce electricity. The energy which is generated from the heat within the earth is called the Geothermal energy.

Thus,

Solar - sun's rays

Moving water - Hydropower

Plants - Biomass

Nuclear reactions - Geothermal

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Answer:

When these atoms gain electrons, they acquire a negative charge because they now possess more electrons than protons. Negatively charged ions are called anions. Most nonmetals become anions when they make ionic compounds. A neutral chlorine atom has seven electrons in its outermost shell.

Explanation:

Hope this helps!

Answer:

The molecular formula of this compound is (2) C2H4O2.

Explanation: