Give the IUPAC name for the following compound. A) R-1-butyn-3-ol B) S-1-butyn-3-ol C) R-3-butyn-1-ol D) S-3-butyn-1-ol

Answer:

9.0 mol Na2SO4

Explanation:

Answer: 4

Explanation:

Answer:

Helium

Explanation:

Answer:

helium i guess i m not sure

Answer:

B.

Explanation:

Answer:

The moon's surface has been struck with other objects.

Explanation:

Answer 1 - Craters are not a sign of alien life as there is nothing directly showing the crater's are not natural phenomena.

Answer 2 - Craters are (normally) produced by the impact force of a foreign object that is moving quickly and collides with an object of larger size.

Answer 3 - Volcanos form mountains and magma tubes, not craters.

Answer 4 - The formation of mountains does not relate to craters in any meaningful way.

Answer: The moon’s surface has been struck with other objects.

Explanation: because those crates were caused by drifting objects such as asteroid's and meteorite's that caused craters in the moon.

the answer is D

Answer: The statement that theatoms are made up of protons, neutrons, and electrons is not a part of Dalton's atomic theory. Therefore, option c is correct.

Explanation:

In the given compounds, oxygen has an oxidation number of +2 in Na2O.

Oxidation number refers to the degree of oxidation of an atom in a molecule, ion, or formula unit.

It's a vital notion in redox reactions. The oxidation number is designated with either a positive or negative number.The sum of oxidation numbers in any molecule or ion must equal its charge. It's not a real charge, but it has a positive or negative sign depending on whether it's positive or negative ion or molecule.

Let's determine the oxidation number of oxygen in each compound :

Therefore, the oxidation number of O is -2 in F2O.

Therefore, the oxidation number of O is -2 in Cl2O.

Therefore, oxygen does not have an oxidation number of +2 in Na2O3.

Therefore, oxygen has an oxidation number of +2 in Na2O.

So, the compound in which oxygen has an oxidation number of +2 is Na2O.

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Answer:

The answer is Double - Replacement Reactions

Explanation:

Double - Replacement Reactions are two different things that change places with each other.

Answer:

Element is a pure substance that cannot split up into simpler form by chemical means while compound is a substance that is made up by two or more elements in a chemical combination

Periods are horizontal columns of the periodic table which have same number of shell

Groups are vertical columns with the same number of outer most shell

Halogens react with metals to form salts

5b. He arranged elements in order of their increasing atomic masses and by similarities of properties

6. Calcium Ca

Barium Ba

Helium He

Neon Ne

7a. 2NaOH + O2

7c. alkali Will observed

For a reaction  2Na + 2H2O --> 2NaOH + H2,  The moles of Na needed to produce exactly 5.6 liters of H2 is mathematically given as

moles of H2=0.125mole

Generally, the equation for the  Chemical Reaction is mathematically given as

2Na + 2H2O -> 2NaOH + H2(g)

Therefore, since 2Na gives 1H2

PV=nRT

Hence

n=PV/RT

n=1*5.6/0.0821 *273

n=0.249mols

In conclusion,The moles is

2Na=1H2

moles of H2=0.125mole

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Answer: B) the forces in the solid hold the atoms tightly in place

Explanation:This is because there is no room for the atoms to move around much and because they are very close together which makes the phase a solid.

To calculate the amount of \(KCIO_{3}\) that must be reacted to transfer -34.2 kJ of heat, we can use the balanced chemical equation and the given ∆H value: 0.764 moles of \(KCIO_{3}\) must be reacted to transfer -34.2 kJ of heat.

2 \(KCIO_{3}\)(s) → 2 KCl(s) + 3 O2(g) ∆H = -89.4 kJ

We can see from the balanced equation that for every 2 moles of \(KCIO_{3}\) reacted, -89.4 kJ of heat is transferred. To determine the amount of \(KCIO_{3}\) needed to transfer -34.2 kJ of heat, we can set up a proportion:

2 moles \(KCIO_{3}\) / -89.4 kJ = x moles \(KCIO_{3}\) / -34.2 kJ

Solving for x, we get:

x = (2 moles \(KCIO_{3}\) / -89.4 kJ) x (-34.2 kJ) = 0.764 moles \(KCIO_{3}\)

Therefore, 0.764 moles of \(KCIO_{3}\) must be reacted to transfer -34.2 kJ of heat.

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Answer:

Inactive ingredients are components of a drug product that do not increase or affect the therapeutic action of the active ingredient, which is usually the active drug. Inactive ingredients are added during the manufacturing process of pharmaceutical products such as tablets, capsules, suppositories, and injections

Mixing the alkyl halide with ethanol, the solution's pH will become more acidic, causing the phenolphthalein to turn colorless.

When you mix an alkyl halide with ethanol, a chemical reaction can occur where the alkyl halide reacts with the hydroxide ion (OH-) from the ethanol to form an alkoxide ion and a hydrogen halide. The reaction can be represented as follows:

RX + C2H5OH → R-O-C2H5 + HX

where RX is the alkyl halide, C2H5OH is ethanol, R-O-C2H5 is the alkoxide ion, and HX is the hydrogen halide.

The reaction generates HX, which can cause the solution to become more acidic by releasing a proton (H+) into the solution. Therefore, the pH of the solution will decrease when you mix the alkyl halide with ethanol.

To observe this pH change, you can use an acid-base indicator that changes color in response to changes in pH. Phenolphthalein is a commonly used indicator for this purpose. It is colorless in acidic solutions and pink in basic solutions.

When you mix the alkyl halide with ethanol, the solution's pH will become more acidic, causing the phenolphthalein to turn colorless.

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Answer:

B

Explanation:

The soap reduced the surface tension behind the boat, causing both water molecules and the boat to be pulled forward, hence option B is correct.

The water molecules are attracted to the surface tension, which reduces the surface tension behind the boat. The boat goes ahead because water molecules tend to travel towards higher surface tension.

Small items will "float" on the surface of a fluid due to surface tension, as long as they cannot pierce and differentiate the top layer of water molecules.

When there is an object on the fluid's surface, the surface that is under tension will act like an elastic membrane.

Therefore, the boat was dragged forward along with the water molecules as the soap decreased the surface tension behind it.

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The distance between the atoms of H-F in meters is 9.20 x 10⁻¹¹ m.

To convert a distance from angstroms (Å) to meters, we can use the conversion factor 1 Å = 1 x 10⁻¹⁰ m.

Therefore, to convert the distance between the atoms of H-F from Å to meters, we can multiply it by the conversion factor:

0.92 Å x (1 x 10⁻¹⁰ m/1 Å) = 9.2 x 10⁻¹¹ m

Rounding this to three significant figures gives:

Distance between H-F atoms = 9.20 x 10⁻¹¹ m

So the distance between the atoms of H-F in meters is 9.20 x 10⁻¹¹ m.

In summary, we can convert the distance from angstroms to meters by multiplying by the conversion factor 1 Å = 1 x 10⁻¹⁰ m. This gives a distance of 9.20 x 10⁻¹¹ m for the distance between the atoms of H-F.

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The change in entropy (ΔS) when 0.150 mol of potassium melts at 67.8°C (hfus = 2.39 kJ/mol) can be calculated using the formula: ΔS = ΔHfus/T    where ΔHfus is the enthalpy of fusion and T is the temperature at which melting occurs.


ΔHfus for potassium is 2.33 kJ/mol at its melting point of 63.3°C. Since the melting point given in the question is slightly higher (67.8°C), we can assume that the ΔHfus value is also slightly higher.
To calculate ΔS, we first need to convert the temperature to Kelvin by adding 273.15:
T = 67.8°C + 273.15 = 341.95 K
Next, we can use the formula:
ΔS = ΔHfus/T
Substituting the values, we get:
ΔS = (2.39 kJ/mol) / (341.95 K)
ΔS = 0.00699 kJ/(mol·K)
Finally, we can convert the answer to J/(mol·K) by multiplying by 1000:
ΔS = 6.99 J/(mol·K)
Therefore, the change in entropy when 0.150 mol of potassium melts at 67.8°C is 6.99 J/(mol·K).

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The solid that she should use to make her cold pack colder when activated is calcium chloride (option D).

A solid is one of the three fundamental states of matter, along with liquids and gases. In a solid, the atoms, ions or molecules that make up the substance are closely packed together and have a fixed shape and volume. Solids have definite shape and volume, which means they maintain their shape and size under normal conditions, and do not conform to the shape of the container in which they are placed. The particles in a solid are held together by strong intermolecular forces, which makes them vibrate in a fixed position around a mean position.

Here,

Based on the test results, we can see that the final temperature after mixing with calcium chloride was the lowest at 32°C. This indicates that calcium chloride has the highest heat-absorbing capacity among the tested substances, making it the best choice for a cold pack. Ammonium nitrate produced a final temperature of 2°C, but it is not a safe substance to work with due to its explosive properties. Urea and sodium chloride both produced final temperatures that were higher than calcium chloride, indicating that they are not as effective at absorbing heat.

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Answer: C. Na2B4O7•10H2O

Explanation:

Hope this helps :)

The formula is tetrasodium borate-Na2B4O7.10H2O

Given- 0.0132 mol Na2B4O7 and 0.1311 mol H2O

Using the molar mass of the anhydrous Na2B4O7 and its mass percentage, we can calculate the molar mass of the hydrate (if we look at it as 100% of the mass) by stoichiometry.

Molar mass of Na = (22.990 g/mol)

Molar mass of B = (10.811 g/mol)

Molar mass of O = (15.999 g/mol)

Molar mass of Na2B4O7= 2⋅22.990 g/mol +4⋅10.811 g/mol +7⋅15.999 g/mol = 201.217 g/mol

201.217g/mol : 52.8%=x g/mol : 100%

​x g/mol = 201.217 g/mol⋅100%÷52.8 %

x g/mol= 381.093 g/mol

In 381.093 g of hydrate, we have 201.217 g of anhydrous Na2B4O7 , the rest of the mass is water.

381.093g−201.217g= 179.876 g of water

Molar mass of H = 1.008 g/mol

Molar mass of O = 15.999 g/mol

Molar mass of  H2O= 1.008 g/mol+ 15.999g/mol  = 18.015 g/mol

179.876g ÷18.015 = 9.98= 10 moles of water per mole of hydrate.

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One way chemicals can help the environment is by using synthetic pesticides and fertilizers to increase crop yields while minimizing water usage. This helps to reduce the land area needed for farming, which in turn reduces deforestation. It also decreases the need to clear additional land for cultivation, which reduces greenhouse gas emissions and helps to prevent soil erosion. Additionally, some chemicals can be used to clean up contaminated soil and water sources, such as in the case of oil spills or industrial pollution.

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The critical value for an independent-samples t-test is total degrees of freedom. Option C.

Each topic must belong to only one group. There is no relationship between observations in each group. There are no significant outliers in the two groups. The independent-sample t-test is appropriate when the researcher wants to know whether the means of her two population groups differ.

Independent samples t-test tells whether the organization has a statistical difference between her two sets of categories or items, and if there is a statistical difference, the difference is significant.  when the observations in each group are independent of the observations in the other group increase.

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Answer:

great job!!

Explanation:

ALL IS CORRECT :)

Size-exclusion chromatography (SEC) is a suitable chromatographic method for isolating pure a and b chains.

SEC is a technique that separates molecules based on their size. In this case, the a and b chains can be separated from other components based on their molecular weight. SEC columns have porous beads that allow smaller molecules to enter and travel through the beads, while larger molecules are excluded and elute first. By choosing an appropriate SEC column, the a and b chains, which typically have different molecular weights than other components, can be isolated and collected separately. This method ensures the purity of the isolated a and b chains.

Size-exclusion chromatography (SEC) is a useful chromatographic method for isolating pure a and b chains. The technique separates molecules based on their size, and by utilizing a suitable SEC column, the a and b chains can be separated from other components due to their distinct molecular weights. This approach guarantees the purity of the isolated a and b chains, making it an effective method for their isolation.

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Measurement is the number or quantity that shows the size of the object. The measurements from longest to shortest are yards, km, inch, and nm.

Length is measured by various scales that include the distance and the range that can be stated in a unit. The unit yard is the longest and is followed by kilometers, inches, and the nanometer.

Therefore, the order is yards, km, inch, and nm.

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hi these are the answers :)

Answer:

The answer is "6.68 \(\frac{ml} {hr}\)".

Explanation:

It's going to be 18.18 kg to turn body mass to kg.  

Size 1mg / kg / hr, therefore = 1 x 18.18

                                               = 18.18 kg / hr  

now we adding 30 mg / ml of dextrose = 30 x 15

                                                                 \(=\frac{450mg}{15 ml +150 ml}\)

of dextrose, from 15 ml to 150 ml;  

Therefore, now 450 mg in 165m:    

\(= \frac{ 450}{165}\\ \\=2.72 \frac{mg} {ml}\)  

now divide the   18.18 by 2.72:

\(=\frac{18.18}{2.72}\)

= 6.68 \(\frac{ml} {hr}\)

Answer: are transferred

Explanation:

An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element or the metal and the element which accepts the electrons is known as electronegative element or non metal.

A covalent bond is formed when an element shares its valence electron with another element. This bond is formed between two non metals.

Answer:

are transferred

Explanation:

i took the test earlier

Milk

Explanation:

because milk is very thick youknow here I go

The circumference of a circle is 11π cm. Then the area is 30.25 π cm.

The term area is defined as the region bounded by the shape of an object. The area of a shape is the space covered by a figure or any two-dimensional geometric shape in a plane.

The area of a shape is the measurement of its surface. To calculate the area of a rectangle or square, multiply the length and width of the rectangle or square.

C = pi d

Therefore,

11π cm = diameter

Radius is 1/2 the diameter

Then radius = 5.5π cm

Area = πr²

Area = 30.25 π

Thus, The circumference of a circle is 11π cm. Then the are is 30.25 π cm.

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