Which choice is an element?
O sodium chloride
O water
O oxygen
O air

Mass of the liquid is the amount of the liquid counted up or measured in grams to calculate its actual mass.

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Explanation:

12C , 13C , and 14C ARE ALL elemental carbon. Because each isotope has 6 protons , 6 positively charged, massive nuclear protons, and different numbers of neutrons.

Scientists who make contributions to scientific knowledge often come from different backgrounds and live at different times. Option C.

The planets are in elliptical motion around the sun. The figure below shows two orbits with the same semimajor axis, focus, and orbital period. One is a circle with an eccentricity of 0.0. The other is an ellipse with an eccentricity of 0.8. Johannes Kepler was a German mathematician and astronomer who discovered that the earth and planets orbit the sun in elliptical orbits.

He gave his three basic laws of planetary motion. He also did important work in optics and geometry. Johannes Kepler is best known for his three laws of planetary motion. These laws are: Planets move in orbits shaped like ellipses. The lines between the planets and the sun cover equal areas in equal time. He formulated the law of universal gravitation. He identified the first moons of Jupiter. He collected detailed data that led to the proposal of the heliocentric model.

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Answer:

Composition. The ingredients of the solar nebula fell into 4 categories based on their condensation temperatures: metals, rocks, hydrogen compounds (water, methane, ammonia), and light gasses (hydrogen and helium).

Explanation:

The given data is of NMR spectroscopy and the only molecule identified from it is 2,2-dimethyl-1-phenylbutan-1-one.

NMR spectroscopy is an essential technique that uses radio frequency pulses to measure an atomic nucleus' resonant frequency in relation to its chemical or environmental surroundings (for example, the most prevalent stable isotopes 1H, 13C, and 15N).

2,2-dimethyl-1-phenylbutan-1-one (C12H16O, Mol. wt. 176 g/mol) is the only pure organic molecule identified by the data provided (Mass, IR, 1H NMR, and 13C NMR).

Two orthoprotons "a" in 1H NMR spectroscopy produce a signal at 7.8 ppm as a result of interaction with neighboring protons. At 7.5 ppm, a multiplet of one para proton (B) and two meta protons (C) is seen. Methylene protons 'd' pair with nearby three protons to form a quartet of two protons at 1.4 ppm. Singlet at 1.3 ppm is produced by six equivalent protons (proton "e") of methyl groups. Due to interaction with two methylene protons, three protons "f" appear as a triplet at 0.9 ppm.

Carbonyl carbon (C1) appears in 13C NMR spectroscopy at 211 ppm. At 138 ppm, ipso carbon (C2) signals. The other four aromatic carbons provide a stronger signal at 128 ppm and the para carbon (C3) to emerge at 133 ppm (C4). The signal levels for carbons C5, C6, C7, and C8 are 48, 33, 23, and 7 ppm, respectively.

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From the idea that the KCN is made of two ions of opposite charge, then the compound is ionic.

We can say that a compound is ionic if the compound that is in question is composed of ions. Note that ions are species that are positively or negatively charged. As such, ionic compounds are essentially an ion pair and they are different from the covalent compounds.

The compounds that are covalent are the compounds that are forms when two atoms share electrons in a bond. In this case, there are no ions and we do not have species that have a full positive or negative charge as we do have with the ionic compounds that we discussed earlier here.

As we can see, the KCN compound is composed of the potassium ion that is positively charged as well as the cyanide ion that is negatively charged thus the compound must be said to be an ionic compound.

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• The depression in freezing point is given by ΔTF = KF · b · i,

where i depend upon the number of ions produced by the solute in a solution.

• The higher the value of i obtained, the higher the depression freezing point .

• CaCl2 (aq) → Ca2+ (aq) + 2Cl– (aq).....(3 ions)

• and NaCl Na+ and Cl– ions →...............(2 ions )

• Sugar/sucrose doesnt dissociate

• Thus CaCl2 will have similar freezing point as water . Option B

•

An ester local anesthetic known as benzocaine is frequently used as a topical pain treatment or as cough drops. It is marketed under the trade names Orajel and others. Many over-the-counter anesthetic ointments, including those for oral ulcers, contain it as the active ingredient.

8.49 g of CO2 and 2.14 g of H2O are produced upon complete burning of a 3.54 g sample of benzocaine with extra oxygen. We discover that a different sample weighing 2.35 g has 0.199 g of Nitrogen in it.

It is discovered that benzocaine has a molar mass of 165 g>mol.

A fuel and an oxidant, typically atmospheric oxygen, engage in a high-temperature exothermic redox chemical reaction known as combustion, or burning, which results in the production of oxidized, frequently gaseous products in a mixture known as smoke.

Benzocaine topical overdoses may result in potentially fatal side effects such irregular heartbeats, convulsions, unconsciousness, delayed breathing, or respiratory failure (breathing stops).

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When a withering flower is immersed in water, it will be revived as the water pressure in the plant cells rises, and hence the cells pull ups water through osmosis.

Wilting is defined as the loss of stiffness in non-woody plant components. This occurs as a result of the cells containing less water, which causes the turgor pressure in the non-lignified cell to decrease toward zero. If the solution is considerably diluted, meaning that the concentration of water inside the cell is lower than that of the medium surrounding the cell, then in this scenario, osmosis will take place and the cell will osmotically absorb water, and the cell will become turgid.

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1.615304584 ×10⁵⁸ ways can 100 new male students be assigned to these five halls.

A probability is a number that expresses the possibility or likelihood that a specific event will take place. Probabilities can be stated as proportions with a range of 0 to 1, or as percentages with a range of 0% to 100%.

Ways of selecting 10 students out of 100 =  C(100,10) for D1.  

After that 100-10 = 90 students are remaining.

Ways of selecting 5 students out of 90 is C(90,5) for D2.

Ways of selecting 15 students out of 90-5 = 85 is C(85,15) for D3.

Now number of remaining students is 85 -15 = 70.

Now for each of these 70 students we have 2 choices D4 and D5.

So these 70 students can be distributed in 2^70 ways.

So number of ways 100 new male students can be assigned to these five halls is

[tex]\begin{aligned}&=C(100,10) \cdot C(90,5) \cdot C(85,15) \cdot 2^{70} \\&=1.73 * 10^{13} * 43949268 * 1.798 * 10^{16} * 1.1806 * 10^{21} \\&=\mathbf{1 . 6 1 5 3 0 4 5 8 4} * \mathbf{1 0}^{58}\end{aligned}[/tex]

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The practice that would decrease the impact of extracting minerals for smartphones is the properly disposing of mining waste.

Why does manufacturing smartphones have a negative impact?

Most modern smartphones require use of minerals such as copper, tungsten, and cobalt for manufacturing.

These minerals have to be extracted from soil and this has a huge negative impact on ecosystems.

The consequences can include soil erosion, sinkholes, biodiversity loss, and contamination of surface, ground, and freshwater resources by chemicals released during mining operations. Carbon emissions from these activities also have an impact on the atmosphere, which in turn affects biodiversity and human health.

Therefore, the Option D is correct.

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By using Dalton’s law of partial pressure, it is calculated that the [tex]CO_2[/tex]collected in the experiment has a pressure of 725.35 mm Hg.

A gas mixture's total pressure is equal to the total of the partial pressures of its component gases, according to Dalton's law of partial pressures.

Looking at the pressure in a closed container of gas and water is a frequent application of the Dalton's law of Partial Pressures. The pressure that the gas puts on the liquid is the system's overall pressure.

Real gases do not behave in an ideal manner; instead, they behave in an ideal manner only at low pressures and high temperatures. As a result, Dalton's law of partial pressure is only relevant at low pressures and low temperatures; it is not applicable at high pressures and low temperatures.

Given:

Pressure of mixture = 744 mm Hg

Temperature = 21℃

Pressure of Water vapour = 18.65 mm Hg

To find:

Pressure of [tex]CO_2[/tex] = ?

Formula:

Pressure of mixture = Pressure of [tex]CO_2[/tex] + Pressure of water vapour

Pressure of [tex]CO_2[/tex] = 744 - 18.65

P of [tex]CO_2[/tex] = 725.35 mm Hg

Result:

The pressure of [tex]CO_2[/tex] collected in the experiment is 725.35 mm Hg, according to Dalton’s law of partial pressure.

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Answer:

Beta decay is a radioactive decay in which a beta ray is emitted from an atomic nucleus. During beta decay, the proton in the nucleus is transformed into a neutron and vice versa. If a proton is converted to a neutron, it is known as β+ decay. Similarly, if a neutron is converted to a proton, it is known as β– decay.

A rate is what is used when two quantities are in a ratio but have different units. We can predict how one quantity will change as we adjust another using rates.

Volume of a cone = π*r^2*h/3

                              = π*10^2*20/3

                              = 2094.3951 cubic meters.

Volume of water lost when its 8 inches deep = V = π*r^2h/3

                                                                             = π·10^2·12/3

                                                                             = 1256.63706 cubic meters.

Remaining volume = 2094.3951 - 1256.63706

                               = 837.758 cubic meters.

Volume of water lost per minute = 0.5 cubic meters.

Time remaining =  837.758 * 0.5

                          = 7 hours approx.

Volume is a measurement of three-dimensional space that is occupied. It is frequently expressed mathematically using standard or SI-derived units. Volume and the measurement of length are connected.

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Using a stoichiometric calculation, it was determined that 178.43 grams of nitrogen are needed to produce 325 grams of ammonia.

We can use a simple stoichiometric proportion to calculate this. First, we write the reaction:
[tex]N_{2} + 3H_{2}[/tex] → [tex]3 NH_{3}[/tex]

We can see that 1 mole of nitrogen produces 2 moles of ammonia.

Nitrogen's molar mass is 2 * 14 = 28 g/mol.

The molar mass of ammonia is 14 + 3 * 1 = 17 g/mol.

Based on this and the reaction equation, we can say that 28 grams of nitrogen produce 3 mol * 17 g/mol = 51 g of ammonia.

Now, we make a proportion:

28 g of nitrogen : 51 g of ammonia = X : 325 g of ammonia

X = 28 g of nitrogen * 325 g of ammonia / 51 g of ammonia = 178.43 g of nitrogen

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At the end of glucose metabolism, 2 molecules of CO2 remain from the original glucose molecule

 Glucose metabolism occur in three main pathways

1. Glycolytic pathway

Glucose is broken down to produce 2 molecules of pyruvate and ATP

2. Pyruvate Oxidation pathway

Pyruvate is oxidized to produce Acetyl CoA

3. Citric Acid pathway or Kreb's cycle

Acetyl CoA is further broken down to produce 2 molecule of CO2 and 3 molecules of NADP.

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The chemical formula of the substances that has the same number of carbon atoms are:

A chemical or molecular formula is a notation indicating the number of atoms of each element present in a compound.

A subscript, which is a number written below another letter or number, is used to show the number of atoms of each element in a chemical compound.

According to this question, four chemical formulas were given as follows:

However, only C₂H₆O and CH₃CH₂Br contains an equal number of carbon atoms of 2.

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Two different samples of matter are measured in each of these glass containers. Both of the containers show the same measure for both samples of matter. The samples most likely to have volume in common.

The specific inertial and gravitational mass, as well as the volume it takes up, can be used to identify matter. A substance can exist in three basic states: solid, liquid, and gas.

Volume is a three-dimensional measurement that's used to gauge a solid shape's capacity. It implies that a closed form's volume determines how much space it can occupy in three dimensions.

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Answer:

The correct answer is volume

Hope it helps

Explanation:

a) Rubidium: It is a chemical element with chemical symbol Rb.

    Atomic no.: 37

    Group: group 1 and first Alkali metal in the group to have density higher than water.

Discovery: Robert Bunsen and Gustav Kirchhoff

b) Germanium: It is a chemical element with the chemical symbol Ge.

   Atomic no.: 32

   Group: Group 14 Carbon group, a grayish white metalloid in the carbon     group.

   Discovery: Clemens Winkler

c) Magnesium: It is a chemical element with a chemical symbol of

  Atomic no. : 12

  Group: group 2(llA) of the periodic table and the chemical properties with the other five alkaline earth metals.

 Discovery: Joseph Black

d) Titanium: It is a chemical formula with a chemical symbol of Ti

   Atomic no. : 22

  Group : group 4 (IVb) of the periodic table a silver grey white metallic appearance.

  Discovery : William Gregor

e) Iodine : Iodine is a chemical element with a chemical symbol I.

   Atomic no. : 53

   Group: group 7A of the periodic table, which is a non metallic at a standard conditions.

    Discovery: Bernard Courtois

f) Strontium: It is a chemical element with the symbol Sr.

  Atomic no. : 38

 Group : group 2(alkaline earth metal) which is a soft silver white yellowish metallic element.

 Discovery: William Cruickshank

Refer to the attached Periodic Table and link for further information,

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[tex]0.1158 \10^{-3} times[/tex] mol of NaOH  is needed to neutralise  36.1 ml of potassium hydroxide solution.

[tex]To\ determine\ the mass \ of {KHP}$ reaquired. \\we should first determine the number of moles of $\mathrm{NaOH}$ present is $3.21 \mathrm{~mL}$ of $36.1 \mathrm{M} \mathrm{MNaOH}$ solution.Moles of $\mathrm{NaOH}=$ molonity of $\mathrm{NaOH}$ $x$ solution of $\mathrm{NaOH}$ in $(\mathrm{L})$[/tex]

[tex]$$\begin{aligned}&=36.1\frac{\mathrm{mol}}{\mathrm{K}} \times \frac{3.21}{1000} \mathrm{~K} \\&=0.1158 \times 10^{-3} \mathrm{~mol} \text { of } \mathrm{NaOH}\end{aligned}$$[/tex]

moles are the a standard scientific unit used to measure large quantities of very small entities such as atoms, molecules, or other defined particles.  A mole means a very large number of units, 6.0221076 × 1023.

The number of atoms or other particles in a mole is the same for all substances. A mole is related to the mass of an element as follows:

one mole of carbon-12 atoms is 6.0221076 × 1023 atoms and has a mass of 12 grams. By comparison, one mole of oxygen, by definition, consists of the same number of atoms as carbon-12, but has a mass of 15,999 grams. Therefore, the mass of oxygen is greater than the mass of carbon. This reasoning can also be applied to molecular weights or formula weights.

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Answer: The first task is to determine the moles of each gas present. This makes use of the molar masses of each gas. The molar masses are:

Molar Mass Ar = 39.948 grams per mole

Molar Mass Ne = 20.1797 grams per mole

Molar Mass CO2 = 44.01 grams per mole

Calculating for the moles of each gas present, we get.

(In the png attatched.)

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Simple molecular substance presumably small substances smell as the particle the release in the air, the odor they produce. The more volatile substance release particles off more easily hence stronger it smells.

The smells travels through the medium of air by the concept of diffusion.  Diffusion is a method where air particle travels freely in all directions and eventually spread through air around them. The particles in diffusion move from higher concentration to lower concentration.

Different molecules have different smell as their molecular vibrations give them the distinct smell. Odorant compounds is not limited to carbon containing compounds, both organic and inorganic have odor e.g. [tex]NH_{3}[/tex].  

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The volume in m³ needed to store one mole of cube-shaped children's blocks 2.00 cm long on each side is 4.816 * 10¹⁸ m³

The volume of one mole of cube-shaped children's blocks 2.00 cm long on each side is calculated as follows:

The volume, V, of a cube is calculated using the formula: V = s³

where s is the length of one side of the cube.

Length of a side of the cube-shaped children's blocks = 2.0 cm or 0.02 m

The volume of the cube-shaped children's blocks = 0.02 m * 0.02 m * 0.02 m

The volume of the cube-shaped children's blocks = 8 * 10⁻⁶ m³

Volume of one mole of the cube-shaped children's blocks = 6.022 × 102²³ ×  8 * 10⁻⁶ m³

Volume of one mole of the cube-shaped children's blocks = 4.816 * 10¹⁸ m³

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The equation for the beta decay of Beryllium-10 is 10^ 4 Be =0^ -1 β + 10^ 5Be.

In the course of a radioactive decay process called beta decay, an atomic nucleus emits a beta ray. During beta decay, the proton in the nucleus transforms from a proton to a neutron, and vice versa. + decay refers to the conversion of a proton into a neutron. Similar to this, the conversion of a neutron into a proton is known as decay.

It is clear that the negative beta decay is exothermic. However, a proton becomes a neutron in positive beta decay. Due to the discrepancies in the rest masses (1.3 MeV; see Table 2.1), this requires energy, which is supplied by the nucleus' mass reduction.

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Answer:

Plants provide us with food, medicine, wood, fuel, and fiber. In addition, they provide shelter for a multitude of other living beings, produce the oxygen we breathe, maintain the soil, regulate humidity and contribute to climate stability.

Answer:

Explanation:

1. The characteristics of an acid are that it has a sour taste, reacts with metals, and turns blue litmus paper into red.

2. When you add TOO MUCH solute to a solution, the solution becomes saturated at some point. It will not dissolve anymore and will remain solid instead.

3. A mixture contains an acid and a base.

4. You test a liquid, and its pH is 7. This liquid is Neutral.

5. Lemon juice, apple juice, and Vinegar all have pH measurements below seven (7), making them acidic.

6. Ammonia, blood, and drain cleaner all have pH measurements above seven (7), making them basic.

7. Erosion is another word for eating away at material.

8. Vinegar can be an acid or base because it is a good conductor of electricity.

9. Cation is a positive ion and Anion is a negative ion.

10. Two or more substances mixed but not chemically combines are a Mixture.