Use the periodic table to determine which of the following could be an isotope of bromine (Br). Check all that apply.
Z = 79, A = 196
Z = 35, A = 79
A = 79, N = 44
Z = 44, N = 44

When a sample of radon decays by alpha emission, the number of daughter isotopes is two.

Radioactive decay refers to the process by which the nucleus of an atom decays spontaneously with the emission of radiation and the formation of one or more new daughter atoms with as smaller nuclei.

The emission of an alpha particle during radioactive decay involves the emission of helium nuclei.

The emission of alpha particles by radon is shown below:

²²²₈₆Ra ---> ²¹⁸₈₄Po + ⁴₂He

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Answer:

Explanation:

10.4/.129=80.6201  find the Atomic weight of which element has approx.  80.6201

Br has an atomic number that is closest at 79.904

NaCl is ionic compound and CaO,NO is covalent compound.

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Consider the following equilibrium system:

2HI ⇌ H₂ + I₂ At constant temperature and volume, if the more I₂ is added to the above equilibrium. The equilibrium results from shift to : left with a net decrease in [H₂].

The balanced reaction is given as :

2HI ⇌ H₂ + I₂

if we add more  I₂ in the given equilibrium , then equilibrium will to left side and with the net decreases of  [H₂]. the production HI increase.

Thus, Consider the following equilibrium system:

2HI ⇌ H₂ + I₂ At constant temperature and volume, if the more I₂ is added to the above equilibrium. The equilibrium results from shift to : left with a net decrease in [H₂].

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Answer:

2-pentene

Explanation:

On the 2nd Carbon we see a C=C, carbon with double bonds have the suffix -ene.

The pH of a 0.81 M solution of methylammonium iodide is 0.092.

pH is a figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.

The pH of a substance or solution can be calculated by using the following expression;

pH = - log {H}

Where;

According to this question, 0.81M is contained in a solution of methylammonium iodide.

pH = - log {0.81}

pH = 0.092

Therefore, 0.092 is the pH of the methylammonium iodide.

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The way in which a forensic scientist would best categorize "An imprint of a shoe sole on soil." is as an: A. impression evidence.

In Forensics, there are different types of evidence and these include the following:

An impression evidence can be defined as a type of evidence that comprises any form of markings that are produced when a physical object (body) comes in contact with another physical object (body), thereby, leaving behind an indentation, pattern, sign, or print on its surface.

In this context, we can reasonably infer and logically deduce that an imprint of a shoe sole on a soil would be best categorized as an impression evidence because it leaves behind a pattern.

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Answer:

It's A

Explanation:

The concentration of the dilute sulfuric acid is 0.047  mol dm-3.

We know that a neutralization reaction has to do with the kind of reaction that occurs between an acid and a base. The acid is made to react with the base and the product of the reaction would be salt and water only. We can now be able to find  the concentration of the dilute sulfuric acid in mol dm-3 form the procedure that have been laid down below.

Concentration of the base [tex]C_{B}[/tex] =  0.100mol dm-3

Volume of the base [tex]V_{B}[/tex]=  25.00cm^3

Concentration of the acid [tex]C_{A}[/tex]  = ?

Volume of the acid [tex]V_{A}[/tex] = 26.60cm^3

Number of moles of the acid [tex]N_{A}[/tex] = 1

Number of moles of the base [tex]N_{B}[/tex] = 2

Now;

[tex]C_{A}[/tex] [tex]V_{A}[/tex]/ [tex]C_{B}[/tex] [tex]V_{B}[/tex] =  [tex]N_{A}[/tex]/ [tex]N_{B}[/tex]

[tex]C_{A}[/tex] = 0.100mol dm-3 *  25.00cm^3  * 1/26.60cm^3 * 2

[tex]C_{A}[/tex] = 2.5/53.2

[tex]C_{A}[/tex] = 0.047 M

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The study of analytical chemistry includes Crystal Structures of matter. Therefore, option (C) is correct.

Analytical chemistry can be described as the studies and uses of instruments and methods to identify, separate, and quantify matter. In practice, identification, or quantification can constitute the analysis or be combined with another method.

Qualitative analysis is related to identifying analytes, while quantitative analysis determines the amount or concentration. Analytical chemistry contains classical chemical methods and instrumental methods.

Classical qualitative methods are used for separations such as precipitation, distillation, and extraction. Identification is based on differences in odor, color, melting and boiling point, solubility, radioactivity, or reactivity.

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Answer:

180⁰ bond angle

Explanation:

if a electron is removed from NO², you get the NO²+

it is isoelectronic with CO², having two N=O. Double bonds and nonunpaired electrons, so repulsion between the 2 refions of electron density is minimised but the 180⁰ bond angle, and it is linear , as wirht CO ²

The statement that best describes a concern with using fossil fuels is that burning fossil fuels has a negative impact on the environment (option B).

Fossil fuels are fuels derived from hydrocarbon deposits such as coal, petroleum, natural gas and, to some extent, peat. These fuels are non-renewable, and their burning generates the greenhouse gas carbon dioxide.

When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas, into the air. Greenhouse gases trap heat in our atmosphere, thereby, causing global warming.

This suggests that the burning of fossil fuels yields a negative impact of the environment because it causes a negative effect called global warming.

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Ideal gas law is valid only for ideal gas not for vanderwaal gas. Combined Boyle's and Charles' gas law is used here. Therefore the new volume of gas is 88.7L.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of gas

V= volume of gas

n =number of moles of gas

T =temperature of gas

R = Gas constant = 0.0821 L.atm/K.mol

Combining Boyle's and Charles' gas law

P₁V₁/T₁ = P₂V₂/T₂

{ (0.92atm) (100 ml)} ÷283K ={ (1 atm) (V₂)} ÷273 K

V₂ = 88.7L

Therefore the new volume of gas is 88.7L.

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Answer:

Carbon has the greatest ionization energy in that group.

Explanation:

I don't know if this is helpful but my teacher used ice cream to explain ionization energy to us. Imagine an ice cream cone standing up straight, ionization energy decreases as you go down, just like how the ice cream cone gets smaller as you go down cause the base of the cone is just a small tip. If you imagine an ice cream cone falling over then it could now be sideways and ionization energy increases from left to right across the periodic table, just like the ice cream cone begins small at the tip and as you go to the right it increases in size.

Two different atoms have nine protons each and the same mass. However, one is neutral while the other has a negative charge then the atomic structure of the both atom are of same element but one of them is electrically neutral and other has a stable electronic configuration

An atom is said to be neutral because it has an equal number of electron and proton in it  and if two different atom have nine proton each and same the mass but one is neutral while the other has a negative charge and the mass of an atom is determined by the number of proton and neutron is present in its nucleus and since both the given atom have 9 proton and the same mass and they must also have the same number of neutron

This implies both the atom have the same nucleus but different charges so it can be concluded that they both the atom of the same element but one of them is electrically neutral and other has stable electronic configuration

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The mass of the zinc II hydroxide produced is 22.77 g.

It is common that we use the stoichiometry of a reaction to be able to obtain the parameters that have to do with the reaction. In his case, we already have the balanced reaction equation of this reaction and this is our basic stock in trade for the task that is ahead of us.

Now we have; 2 NaOH(aq) + Zn(NO₃)₂(aq) → Zn(OH)₂ (s) + 2 NaNO₃ (aq)

Number of moles of the sodium hydroxide =  18.5 g/40 g/mol = 0.46 moles

Number of moles of the zinc II nitrate solution = 1.00 M * 0.800 L = 0.8 moles

If 2 moles of the sodium hydroxide reacts with 1 mole of the zinc II nitrate

0.46 moles  of the sodium hydroxide reacts with; 0.46 moles * 1 mole/ 2 moles

= 0.23 moles

Hence the sodium hydroxide is the limiting reactant.

Thus;

2 mole of sodium hydroxide produces 1 mole of zinc II hydroxide

0.46 moles of sodium hydroxide produces 0.46 moles  * 1 mole/2 moles

= 0.23 moles

Mass of the  zinc II hydroxide =  0.23 moles * 99 g/mol

= 22.77 g

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Answer:

crust

Explanation:

it is on the outside so it is exposed to physical weathering

The part of the Earth that experiences physical weathering is the crust. Therefore, option (A) is correct.

Physical weathering is when rocks and minerals break down through mechanical means, but their chemical make-up doesn't change. The topmost layer of the Earth, called the crust, is changed by things like temperature changes, friction, frost action, and the actions of wind, water, and ice.

These things can crack, break, and erode rocks, causing them to break up physically into smaller pieces without changing their chemical makeup. The Earth's mantle, inner core, and outer core, on the other hand, are not directly visible to the surface and do not go through the same physical processes that cause the crust to break down.

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The true about the luminol is it does not affect the DNA of the substance.

Luminol is a type of chemical which does not affect the DNA of the substance. luminol is used in forensic test by the forensic scientist. luminol solution will react with blood and produce the light.  luminol chemical is sensitive to blood.  in forensic test luminol is used to detect the amount of blood at the crime scene. it will react with the iron in the hemoglobin. luminol is insoluble in water.

Thus, The true about the luminol is it does not affect the DNA of the substance.

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As the dry bulb temperature increases with a constant temperature difference, the relative humidity increases.

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Ca2+ as calcium can leave 2 electrons to have an octet config.

The amount of coconut milk added if the final temperature of the soup was found to be 72.0 °C is 430g

The amount of coconut milk added can be found using the equation:

m₁C₁ΔT₁ = m₂C₂ΔT₂

Where m is the mass, C is the specific heat, and ΔT is the change in temperature.

In this equation, m₁ is the mass of the coconut milk, C₁ is the specific heat of the coconut milk, ΔT₁ is the change in temperature of the coconut milk, m₂ is the mass of the soup, C₂ is the specific heat of the soup, and ΔT₂ is the change in temperature of the soup.

We are given the specific heat of the coconut milk and the soup, the change in temperature of the soup, and the final temperature of the soup. This allows us to solve for the mass of the coconut milk, which is m₁.

m₁ = m₂C₂ΔT₁/C₁ΔT₂

m₁ = (1175 g)(3.60 J/g°C)(72.0°C - 90.0°C)/(3.98 J/g°C)(72.0°C - 25.0°C)

m₁ = -427 g

This answer is impossible because the mass of a substance cannot be negative. By solving it in other means we get,

The amount of coconut milk added can be found using the equation

ΔQ = mCΔT

ΔQ is the heat transfer, m is the mass, C is the specific heat, and ΔT is the change in temperature.

We are given the specific heat of coconut milk (Cs = 3.98 J/g°C), the initial temperature of the coconut milk (25.0°C), the final temperature of the soup (72.0°C), and the heat transfer of the soup (ΔQ = 1176 * 3.6*47 = 81168 Joules).

Therefore, the equation becomes:

81168 = m(3.98)(47)

m = 81168 / (3.98 * 47)

m = 81168 / 189.06

m = 429.6 grams

The amount of coconut milk added was 429.6g which could be rounded off as 430g

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The molecular formula is (CH2O)5 when the scale factor is 5 and the empirical formula is CH2O.

Considering the question given above, the following data were obtained:

Empirical formula is CH₂O

Molar mass of compound = 150 g/mol

Scaling factor (n) =?

Empirical formula × n = molar mass

[CH₂O]n = 150

[12 + (2×1) + 16]n = 150

[12 + 2 + 16]n = 150

30n = 150

Divide both sides by 30

n = 5

Therefore, the scaling factor is 5

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Answer:

C 5 H 10 O 5

Explanation:

Answer:D. an increase in temperature and an increase in volume

Explanation: Heat is a reaction, so if you increase the temperature of the system, you increase the amount of reactants. Thus, higher temperature would push equilibrium toward the products, the right. The products, however, have 4 molecules in comparison to the reactants’ 2, and so you have to increase the volume to push equilibrium that way as well.

From the dilution formula, the final concentration of the solution is  1.4 %.

The final concentration is the concentration at the end of the dilution. We know that dilution is the process by which we add more water to the solution.

Now we have the following;

Initial concentration C1 = 5.4 %

Initial volume V1= 53.5 mL

Final concentration C2= ?

Fina volume V2= 205.0 mL

C1V1 = C2V2

C2 =  5.4 *  53.5/205.0

C2 = 1.4 %

Hence, we have a solution that would have a final concentration of 1.4 %.

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Option is the right response because it indicates a synthesis reaction (D) 2Na+Cl2 > 2NaCl.

Synthesis reactions are those that take place when two distinct molecules or atoms interact to create a new chemical or molecule. Whenever a synthesis reaction takes place, energy is often released, as well as the process is exothermic. whenever two or more components (compounds or elements) mix to create a new product, a compound having new qualities. They synthesize to create a new material, which is why the process is known as a synthesis.

Bonds connecting two substances are formed during synthesis reactions. As a result, you may want to think about synthesis reactions as processes that help your body create things. Because of this, we can see that synthesis reactions are crucial for both body growth and tissue healing.

A descriptive statement over ranges of selected variables for input and output is the basis for functional synthesis (FS), which tries to produce an implementation. As is customary, FS tasks were formulated as "all exists" equations, wherein input variables are quantified across the board & output variables are quantified existentially.

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Answer:

C+02 > CO2

Explanation:

hope this helps-

The volume of the water produced is obtained as 0.01422L.

We know that a combustion reaction is one in which a substance is burnt in oxygen. When we burn the substance in oxygen, heat is evolved and this can be seen as a change in the temperature of the system.

Now;

We must find the number of moles of each of the reactants so that we can be able to determine the limiting reactant.

Volume of methanol =  25.0 mL

Density of methanol = 0.850 g/mL

Mass of methanol = Density * volume

= 0.850 g/mL * 25.0 mL

= 21.25 g

Number of moles of methanol= 21.25 g/32 g/mol

= 0.66 moles

Volume of oxygen = 12.5 L

If 22.4 L of oxygen is occupied by 1 mole

12.5 L  is occupied by 12.5 L  * 1 mole/22.4 L

= 0.59 moles

If 2 moles of methanol reacts with 3  moles of oxygen

0.66 moles of methanol reacts with  0.66 moles  * 3 moles/2 moles

= 0.99 moles

Hence oxygen is the limiting reactant.

If 3 moles of oxygen produces 4 moles of water

0.59 moles of oxygen produces 0.59 moles * 4 moles/ 3 moles

= 0.79 moles

Mass of water =  0.79 moles * 18 g/mol = 14.22 g

Volume of the water = mass/density

= 14.22 g/1.00 g/mL

= 14.22 mL or 0.01422L

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The hurricane that will most likely caused the greatest damage is option A: 140.

It is one whose speed is 157 mph or more - There will be catastrophic damage: With complete roof failure and wall collapse, a significant portion of frame homes will be lost. Residential areas will be cut off by downed trees and utility poles. Power outages could linger for several weeks or even months. For several weeks or months, the majority of the area won't be habitable.

The most destructive storms are those in category 5, which have sustained winds of at least 157 mph.

Therefore, here, there is complete roof failure and wall collapse, a significant portion of frame homes will be lost. Residential areas will become isolated by downed trees and power lines. Power outages could linger for several weeks or even months.

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