Sodium borohydride (NaBH4) is a very selective reagent. Which functional groups can sodium borohydride reduce? Choose all that apply.
I. Ketone
II. Aldehyde
III. Ester
IV. Carboxylic Acid

Answer:

metal or non metal

Explanation:

this is the answer

Answer:

Boron Carbonate; B₂(CO₃)₃

Explanation:

For names, carbonide does not exist; that rules out the first option. Carbide refers to just a carbon atom, not carbon and oxygen as in the polyatomic ion carbonate. That rids us of the third option. We are left with boron carbonate with the formula BCO or boron carbonate with the formula B₂(CO₃)₃.

Recall the carbonate polyatomic ion's formula: CO₃²⁻

Thus BCO cannot be the formula.

Option 4 is your answer, Boron Carbonate; B₂(CO₃)₃.

To further check your answer, observe the oxidation states of boron and the polyatomic ion carbonate. Boron can exist in oxidation states of either 2+ or 3+, and carbonate is only 2-; in this formula, boron will exhibit a 3+ state to balance out with carbonate.

2x3+ = 6+; 3x2- = 6-

6+ + 6- = 0; balanced

Answer:

. Name a soluble compound that could be added to precipitate all of the iron ions from the solution.

Sodium Hydroxide.

7.3g of NaOH are required to produce 16 g of H2O

What are molecular weight ?

The entire mass of the atoms required to form a molecule per mole, expressed in grams, is what makes up the molar mass, also known as the molecular weight. Grams per mole are used to measure molecular mass. To determine molecular weight, count the atoms in each element and increase the result by the element's atomic weight.

Caustic soda or lye are two other names for sodium hydroxide. It is a typical ingredient in soaps and cleansers. Sodium hydroxide is a colorless, odorless solid at room temperature. Sodium hydroxide is a white, odorless liquid.

39 g of NaOH gives 18g of H2O

? g of NaOH gives 16g of H2O

i.e 18*16/39g

i.e. 7.3g of NaOH are required to produce 16 g of H2O

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Lavoisier's Law states:

'Mass is neither created nor destroyed' in chemical reactions.

Answer:

The second part of the Dalton's atoms

theory says all atoms of a given element are identical in mass and properties.

Answer:

c

Explanation:

Answer:

cement is actually an ingredient of concrete. Concrete is a mixture of aggregates and paste. ... Cement comprises from 10 to 15 percent of the concrete mix, by volume.

Answer:

See explanation

Explanation:

Electronegativity is the ability of an atom in a compound to attract the shared electron pair of a bond towards itself.

Electronegativity is one of the periodic trends. It decreases down the group and increases across the period. This implies that as you move from left to right in the periodic table, atoms of elements become more electronegative.

Remember also that non-metallic property increases from left to right in the periodic table. This means that as you move from left to right, metallic properties such as thermal conduction decreases.

It then follows that as electronegativity increases, electrical conductivity decreases from left to right in the periodic table.

There is the formation of intermolecular hydrogen bonding in ethanol as shown in the model below.

Intermolecular interactions can arise when ethanol, a common alcohol, is liquid. These interactions result from the ethanol molecule's polarity and hydrogen bonding propensity.

Two carbon atoms, five hydrogen atoms, and one oxygen atom make up the compound ethanol (C2H5OH). Because the oxygen atom is more electronegative than the carbon and hydrogen atoms, they are bound together by a polar covalent bond.

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A science project in Chemistry that students can carry out is the construction of an electrochemical cell.

Science projects are projects which  are carried out by students as part of their assessment or to improve and enhance their knowledge and ideas about scientific concepts.

A science project in Chemistry that students can carry out is the construction of an electrochemical cell.

An electrochemical cell is a cell that coverts chemical energy to electrical energy.

In conclusion, science projects helps students to develop their own skills in scientific research.

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Answer:

What is the difference between the number of electrons in an atom of Tin (Sn) which has an atomic number of 50, and the number of electrons in an atom of Chlorine (Cl) which has an atomic number of 17. Which statement accurately describes the atoms of a specific element?

Explanation:

Answer:

Explanation:

Because you only have one repeat unit, n=1. 2n-1 becomes 2(1)-1 which is equal to one, meaning one molecule of H2O is produced, as is shown by the top condensation polymerisation reaction.

If you had two repeat units, n=2 so 2n-1=3. Three H2O molecules are produced because you would need two molecules of each reactant so three condesation reactions would occur and three molecules of H2O would be released.

The minerals that commonly occur in sedimentary rocks are quartz, calcite, and hematite. So, the correct options would be a, c, and d.

Pyroxene is not a mineral that commonly occurs in sedimentary rocks. This is because it's a mineral that is found in igneous and metamorphic rocks. Quartz, Calcite, and Hematite are important minerals in sedimentary rocks. Below are the detailed explanations of each mineral.

Quartz: It is a common mineral that occurs in sedimentary rocks and is the second-most abundant mineral in the Earth's crust after feldspar. It has a hardness of 7 on the Mohs scale.

Calcite: This is a carbonate mineral that is found in sedimentary rocks. It has a hardness of 3 on the Mohs scale. Calcite is commonly used in the production of lime, cement, and fertilizer.

Hematite: It is an iron oxide mineral that commonly occurs in sedimentary rocks. It has a reddish-brown color and a hardness of 5-6 on the Mohs scale. Hematite is an important ore of iron.

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Answer:

In beta minus decay, a neutron decays into a proton, an electron, and an antineutrino: n Æ p + e - +.

Radioactive waste from fusion reactions becomes less hazardous much sooner than waste from fission reactions, nuclear fusion is much safer than fission because it leaves no radioactive waste behind.

Both processes are natural, but they can also be carried out in a lab. While fusion involves the "crushing" of two atoms to form a single atom of a new element, fission involves the splitting of an atomic nucleus.

We can conclude from this information that radioactive waste from fusion reactions becomes less hazardous much sooner than waste from fission reactions, and nuclear fusion is much safer than fission because it produces no radioactive waste.

It takes a lot of energy to combine protons so that nuclear forces can overcome electrostatic repulsion. The energy released during the fission process is much greater than the energy released during other chemical reactions.

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Answer: The radioactive waste from fusion reactions becomes less hazardous much sooner than the waste from fission reactions.

Explanation:

Complementary base pairing refers to the specific hydrogen bonding interactions between nucleotide bases in a DNA or RNA molecule. The order in which base pairs are arranged is crucial for the structure, replication, and transmission of genetic information.

In DNA, the bases adenine (A) always pairs with thymine (T), and guanine (G) always pairs with cytosine (C). In RNA, thymine is replaced with uracil (U). This pairing follows the rule of A-T/U and G-C base pairing. The specific sequence of base pairs forms the genetic code that determines the unique characteristics and functions of an organism. The importance of the order of base pairs lies in the ability to encode and store genetic information. The sequence of base pairs carries the instructions for protein synthesis, gene expression, and inheritance. The order of base pairs in DNA determines the sequence of amino acids in proteins, which are essential for cellular functions and organismal development.

Any alteration or mutation in the order of base pairs can lead to changes in protein structure or function, potentially resulting in genetic disorders or diseases. Thus, maintaining the correct order of base pairs is vital for the accurate transmission and interpretation of genetic information. Overall, the order of base pairs in DNA and RNA molecules is critical for the storage, expression, and transmission of genetic information, shaping the characteristics and functioning of living organisms.

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Answer:

i think it might be c

Explanation:

i'm not positive though

Answer:

C

Explanation:

Sedimentary rocks can contain fossils because, unlike most igneous and metamorphic rocks, they form at temperatures and pressures that do not destroy fossil remains.

Doping is the process of addition of impurities to the crystal lattice of the semi-conductor in order to increase its conductivity. Semi-conductors have the conductivity between insulators and conductors. Impurity added is called dopant.

Silicon contains 4 valence electrons in it's outermost shell. Adding Phosphorus to the crystal lattice of silicon which contains 5 valence electrons (electron rich impurity) causes bonding between 4 valence electrons of phosphorus and 4 valence electrons of silicon. 1 electron of phosphorus is free to move to the conduction band which is responsible for conduction of electricity. This type of conductor is called n-type conductor.  

While Gallium contains 3 valence electrons (electron deficient impurity) causes bonding to 3 free electrons of silicon and 1 electron of silicon is free thereby causing a hole. This free electron is available for conduction. This type of conductor is called p-type conductor.

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Transport via pipelines is only possible for specialist goods like liquids and gases.

Gas is a state of matter that lacks both a defined shape and volume. Compared to other states pf material, such as liquids and solids, gasses have a lower density. Particles, which have a great deal of kinetic energy but aren't very attracted to one another, are separated by a lot of free space.

The Earth's atmosphere is made up of approximately % ammonia, 21 percent oxygen, 0.93 % argon, 0.04 % carbon dioxide, and small traces of bright blue, helium, methane, krypton, ozone, and hydrogen in the form of water vapor, according to the educational website Vision Starting to learn (opens in new tab).

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Answer:

Its D

Explanation:

Answer:

D

Explanation:

Based on the description of the graph, the law that is based on it is A. Boyle's law.

Boyle's law states that, at a constant temperature, the pressure and volume of a gas are inversely proportional to each other. In other words, as the volume of a gas decreases, the pressure increases, and vice versa, when the temperature remains constant.

The graph described shows a curve that starts high on the horizontal axis (indicating a large volume) and curves toward the origin, indicating a decrease in volume. As the volume decreases, according to Boyle's law, the pressure of the gas would increase. The leveling out of the curve as it approaches the horizontal axis suggests that there is an equilibrium point where the pressure and volume have stabilized.

Therefore, the graph aligns with the behavior predicted by Boyle's law, which establishes the inverse relationship between pressure and volume for a given amount of gas at a constant temperature. Therefore, Option A is correct.

The question was incomplete. find the full content below:

Which law is based on the graph that is shown below?

A graph is shown with pressure on the horizontal axis and volume on the vertical axis. A curve starts high on the horizontal axis, curves toward the origin, and then starts to level out as it approaches the horizontal axis.

A. Boyle’s law

B. Charles’s law

C. Dalton’s law

D. Gay-Lussac’s law

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1) The weighted averages of each of the isotopes are;

a)18.1 amu

b)   0.06 amu

c)  2.03 amu

2) The  average (Total) atomic mass unit of the unknown element is 20.19 amu

3) The element is neon.

Let us note that an atom is composed of the many different isotopes. The isotopes have different mass numbers but they have the same atomic numbers. Recall that the atomic number is the identity of the element. As such, we know that all the isotopes belong to the same element if they all  have the same atomic number.

Now;

The weighted atomic mass unit for each isotope is;

19.992 * 0.9051 = 18.1

20.994 * 0.0027 = 0.06

21.991 * 0.0922 = 2.03

The  average (Total) atomic mass unit of the unknown element =

18.1 +  0.06 + 2.03 = 20.19

Hence the element is neon.

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Answer:

11.22 gm

Explanation:

32.07 gm / mole * .350 mole = 11.22 gm

The mass of 0.350 moles of Sulphur is equal to 11.22 g.

A mole is a standard unit which is used to calculate the huge number of quantities of atoms, molecules, ions, or other particular particles. The mass of the one mole of any element is called atomic mass and that of any compound is called molar mass.

The number of units present in one mole was found to be equal to 6.023 × 10 ²³ which is known as Avogadro’s constant or Avogadro’s number.

Given, the number of moles of sulphur = 0.350 moles

The mass of one mole of sulphur = 32.07 g

Then, the mass of 0.350 moles of Sulphur = 0.350 × 32.07

The mass of 0.350 moles of Sulphur (S) = 11.22 g

Therefore, 11.22 grams is the mass of 0.350 moles of Sulphur (S).

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Answer:

Explanation:

The equation for calculating the amount of heat released is:

q = mcΔT

where:

q = heat released (in joules)

m = mass of the substance (in grams)

c = specific heat capacity (in J/g·°C)

ΔT = change in temperature (in degrees Celsius)

Given:

m = 30 g

ΔT = 96°C - 25°C = 71°C

c = 4.184 J/g·°C (for water)

so

q = (30 g)(4.184 J/g·°C)(71°C) = 8.91*71 = 635.11 J

Therefore, 635.11 J of heat is released when 30g of water cools down from 96 degree celsius to 25 degree celsius

Note that this calculation is valid only if the process is adiabatic or no heat is exchanged with the environment.