Calculate the mass of scheelite that contains a million oxygen atoms

Answer:

I believe B

Explanation:

Hope this helps

Answer:

Which substances are bases? Check all that apply.

NaOH ✔️

KOH ✔️

H3BO3

NaCl

Ca(OH)2 ✔️

Fe2O3

so (a) (b) and (e)

Explanation:

In the design of a new baby diaper, the manufacturer uses two polymers. The polymer that is best suited to the outside of the diaper is polymer I and to the inside is polymer II

Polymers are large molecules made by bonding (chemically linking) a series of building blocks or smaller units called monomers. The word polymer comes from the Greek words for “many parts.”

Polymers don’t have a definite length. They usually don’t form crystals, either. Finally, they usually don’t have a definite melting point

Monomers used to create polymer I is a dicarboxylic acid and for polymer II is an alkene.

They undergo addition polymerization.

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When a nonmetal bonds with a nonmetal, a covalent bond is involved. Details about non-metals can be found below.

A nonmetal is an element, such as phosphorus or chlorine, that does not have the chemical or physical properties of a metal.

A metal is known to lose or donate electrons when it goes into a reaction, hence, an electrovalent bond is usually formed.

However, a nonmetal is known to accept or gain electrons when it goes into reactions. This means that when two nonmetals bonds in a chemical reaction, a covalent bond is formed between them.

Covalent bond is a type of chemical bond where two atoms are connected to each other by the sharing of two or more electrons.

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Since the nucleus houses the neutron and the proton, it then follows that the nucleus is the point where most of the mass of the atom is concentrated.

The nucleus is composed of protons and neutrons. We know that the mass of the proton is 1640 times the mass of the electron. The neutron only contributes to the mass of the atom.

Since the nucleus houses the neutron and the proton, it then follows that the nucleus is the point where most of the mass of the atom is concentrated.

The electron has a negligible mass therefore, the electron does not contribute to the mass of the atom.

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Answer:

18km

Explanation:

5km+2km+9km+2km=18km

Add up all the distances... :)

Answer: Gases have the lowest density of the three, are highly compressible, and completely fill any container in which they are placed. Gases behave this way because their intermolecular forces are relatively weak, so their molecules are constantly moving independently of the other molecules present. Solids, in contrast, are relatively dense, rigid, and incompressible because their intermolecular forces are so strong that the molecules are essentially locked in place.

Explanation:

The demonstration shows that steel wool burned chemically.

From the demonstration, steel wool burned chemically. The supporting evidence is:

1. Combustion: Bunsen burner flame ignited steel wool. A material combines with oxygen to produce heat, light, and gases or new compounds in combustion. Steel wool burning implies a chemical reaction.

2. Steel wool burned for 20 minutes. This prolonged burning signals a chemical process. Shape and size alterations rarely last this long.

3. Failure to Ignite: A piece of charred steel wool held in the flame again did not ignite. This implies that the initial chemical reaction that caused the steel wool to ignite was irreversible. After a chemical reaction consumes the reactants, it may not happen again without replacing them.

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Answer:

The final temperature of the water is 23.92°C.

Explanation:

Given that,

A heater in a hot water tank gives off 20,000 kJ per hour.  

For 1 hour or 60 minutes, heat is 20,000 kJ

For 90 minutes,

\(Q=\dfrac{20000}{60}\times 90\\Q=30000\ kJ\)

Mass, m = 450 kg or 450000 grams

Initial temperature, \(T_i=8^{\circ} C\)

We need to find the final temperature of the water. We know that the specific heat capacity of water is 4.186 J/g- °C

Heat is given by :

\(Q=mc\Delta T\\\\Q=mc(T_f-T_i)\\\\T_f=\dfrac{Q}{mc}+T_i\\\\T_f=\dfrac{30000\times 10^3}{450000\times 4.186}+8\\\\T_f=23.92^{\circ} C\)

Hence, the final temperature of the water is 23.92°C.

Answer:

The asthenosphere is semi-fluid and always in motion. This movement is caused by the heat in Earth and creates convection currents. Convection currents are circular movements based on temperature and density. The heat from deep inside Earth heats up the semi-fluid particles of the asthenosphere. These particles then become less dense and rise. As they rise to the bottom of the crust, they cool off, become denser, and move back toward the core. Back at the core, their temperature will increase again, causing this circular motion to continue.

Convection currents in the asthenosphere cause movement of Earth's tectonic plates. The crust, though rigid, is broken into a series of tectonic plates that fit together like pieces of a puzzle. The plates float on the semi-fluid asthenosphere and move around in predictable directions. It's like a giant conveyor belt moving molten material from one place to another and causing the plates that float on top to slide to new locations.

Explanation:

The false statement below is B. If ?G < 0, the reaction is spontaneous.

The statement is incomplete and not entirely correct. The Gibbs free energy change (?G) of a reaction determines the spontaneity of a reaction at constant temperature and pressure. A negative? G indicates that the reaction is thermodynamically favorable and spontaneous under standard conditions. However, the value of? G can be affected by changes in temperature, pressure, and concentration of reactants and products.

Regarding statement A, NaI is indeed the reducing agent in this reaction. In this reaction, NaI is oxidized to NaIO3, while HOCl is reduced to HCl.

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A disadvantage of disposing of waste polymers through recycling is that

they must first be separated.

Recycling is the process of forming new polymers and compounds as against their disposal .

Recycling involves separating the items into various sections such as paper,

plastic , metal etc. This is because they both undergo different recycling

processes.

The disadvantage of this process is that it's time consuming and also

expensive as a great amount of time and man power is needed to

separate the waste items.

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Graphite has a higher entropy than diamond, which is again a result of the dense crystal lattice of diamond. In comparison to the graphite structure, it is far more organized.

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To calculate the total potential, simply add the reduction potential of the battery cell to the reduction potential of the electrolytic cell.

When one cell acts as a battery to power another as an electrolytic cell, metal plating occurs at the cathode (positive electrode). The metal being plated is the same as the metal used in the anode (negative electrode) of the battery cell.

To determine the total potential, we need to consider the individual potentials of the battery and the electrolytic cell. The total potential is the sum of these two potentials.

1. Identify the metals used in the anode and cathode of the battery cell.
2. Look up the standard reduction potentials for the metals.
3. The metal with the higher reduction potential will be plated onto the cathode.

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Answer:

can i get a pic

Explanation:

If a sodium citrate sample for coagulation is noted to be filled an inch below the fill line, then the specimen is considered unacceptable for coagulation studies. It alters the properties of blood.

Blood coagulation (clotting) is a natural process by which blood cells form a gel known as a blood clot.

The blood clot generates a protective barrier against the entry of harmful substances inside the body.

Sodium citrate can be used in coagulation studies because blood factors V and VIII are relatively more stable in media that contain this substance.

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Answers:

1. Physical; chemical makeup is not altered

2. Chemical; example of combustion which is a chemical reaction

3. Chemical; burning is a chemical reaction

4. Physical; chemical makeup is not altered

5. Chemical; Iron reacts with damp air to create rust, this is creating something that was previously not there

6. Physical; it is still paper

7. Chemical; tarnish is created from a chemical

8. Physical; carbon dioxide remains carbon dioxide

9. Chemical; a flame is created

10. Chemical; burning is a chemical reaction, fumes and gas is created

11. Physical; properties are not chemically altered

12. Physical; wood is still wood when chopped

13. Chemical; the heat of frying changes the properties and composition of an egg

14. Chemical; Vinegar reacts to baking soda and creates a gas

15. Physical; clouds being formed is a phase change and phase changes are physical

16. Chemical; Mold is created and is not originally there

17. Physical; wood is still wood when sanded

Hope this helped!

Answer: Polar Covalent bonds is an unequal sharing of electrons and Non-Polar Covalent Bonds are an equal sharing of electrons.

Explanation: In polar covalent bonds, we can have partial charges, meaning one element is slightly more negative/positive than the other. Non-polar covalent bongs is when there is no partial charges and usually occur between the same elements. For example Cl-Cl bonds.

The Cistercian order split from the Cluniac order to follow the rules of Saint Benedict more strictly.

The Cistercians, formally known as the Order of Cistercians (Latin: (Sacer) Ordo Cisterciensis, abbreviated as OCist or SOCist), are a Catholic religious order of monks and nuns who split off from the Benedictines and adhere to the Latin Rule, which incorporates Bernard of Clairvaux's contributions as well as the Rule of Saint Benedict. As a nod to the color of the "cuculla" or cowl (choir robe) worn by the Cistercians over their habits as opposed to the black cowl used by Benedictines, they are also known as Bernardines, after Saint Bernard himself, or as White Monks.

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Answer:

alcohol

Explanation:

Bad , fad is the answer check

There are a total of 38 atoms in the compound 4(NH3)2NO2.

To determine the number of atoms in the given compound, we first need to break down the formula and identify the number of atoms in each element.

The formula is 4(NH3)2NO2, which can be written as:

4 x 2(NH3) + 1 x 2(NO2)

Each molecule of NH3 contains

Each molecule of NO2 contains

Therefore, the total number of atoms in the given compound is:

4 x 2 x (1 nitrogen atom + 3 hydrogen atoms) + 1 x 2 x (1 nitrogen atom + 2 oxygen atoms)

= 4 x 2 x 4 + 1 x 2 x 3

= 32 + 6

= 38

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Answer:A fossil is the remains or traces of a once-living plant or animal that was preserved in rock or other material before the beginning of recorded history. ... Fossils of single-celled organisms have been recovered from rocks as old as 3.5 billion years. Animal fossils first appear in rocks dating back about 1 billion years.

Explanation:

Five

Five types of fossils: (a) insect preserved in amber, (b) petrified wood (permineralization), (c) cast and mold of a clam shell, (d) pyritized ammonite, and (e) compression fossil of a fern.

Grams of nitrogen, N₂, are in a 5.00-liter container when the gas is under a pressure of 2.00 atmospheres at 50.0 °C is 5.640g

Gram is the unit of mass or weight that is used especially in the centimeter gram second system of measurement

Here given data is

Volume = 5.00-liter

Pressure = 2.00

Temprature = 50.0 °C = 50.0+273 = 323K

We have to calculate grams of nitrogen = ?

So, PV =nRT

PV = m/MRT

M = Molar mass of nitrogen gas = 28 g/mol

R = gas constant 62.3637LmmHgmol⁻¹K⁻¹

Then putting this value

PV = m/MRT

2.00×5.00 = m/28 × 62.3637 × 323K

10 = m/564.01

m = 5.640g

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Answer: A

Explanation:

Extreme weather events follow normal climate patterns.