The atomicity of bromine is​

Answer:

Human activities are responsible for almost all of the increase in greenhouse gases in the atmosphere over the last 150 years. The largest source of greenhouse gas emissions from human activities in the United States is from burning fossil fuels for electricity, heat, and transportation.

Answer:

d = 16.96 g/mL

Explanation:

Given that,

Initial water level in graduated cylinder is 47 mL and final water level is 48.35 mL.

The weight of the neclace is 22.89 g.\

We need to find the volume of the necklace. We know that, density equals mass per unit volume. So,

\(d=\dfrac{m}{V_f-V_i}\\\\d=\dfrac{22.89\ g}{(48.35-47)\ mL}\\\\d=16.96\ g/mL\)'

Hence, the density of Terry’s necklace is 16.96 g/mL.

Answer:

A

Explanation:

The new mine means the supply is high and the price is low, so she can afford the necklace

Thompson's model concluded that the atom contained something small and negative. The correct option to this question is C.

Thomson's description of the atomic model is one of many scientific models of the atom. Created by J.J. Thomson in 1904, shortly after the electron was discovered. However, the atomic nucleus had not yet been discovered at that time. So he proposed a model based on the known properties available at the time. Known properties are:

Atoms are neutrally charged

Inside an atom are negatively charged particles called electrons. According to the assumptions of Thomson's atomic model, an atom resembles a positively charged sphere with electrons (negatively charged particles) inside.

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Answer: a.polluted runoff into nearby ponds

Explanation:

Answer:

Aa

Explanation:

Abscisic acid (ABA) is a plant hormone that plays a crucial role in regulating various physiological processes, including seed dormancy, germination, and response to environmental stressors. One of the stressors that cause high concentrations of ABA to travel from the roots to the shoot is water stress.

When a plant experiences water stress, such as during drought conditions, the roots sense the lack of water and produce ABA. The ABA then moves up through the plant's vascular system, reaching the leaves where it triggers the closure of stomata, small pores on the leaf surface.

This closure helps to conserve water by reducing the rate of transpiration, which is the loss of water vapor from the leaves.

In addition to stomatal closure, ABA also plays a role in the synthesis of proteins that protect the plant from damage caused by drought, such as reactive oxygen species. Furthermore, ABA induces the accumulation of compatible solutes, such as proline, which help the plant maintain cellular hydration and turgor pressure under water stress conditions.

In summary, high concentrations of ABA during water stress play a critical role in regulating plant water balance and ensuring survival under drought conditions.

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Answer:

C2H6 +02 ===>Co2 + H20.

Explanation:

Answer:

the electronic configuration of Li is

=》 2, 1

and in spdf configuration it's 1s^2 2s^1

Answer: [He] 2s1

Explanation:

Electrons per shell: 2,1

Atomic number: 3

Electronegativity: 0.98

Atomic mass: 6.941 u

Discoverer: Johan August Arfwedson

Period: Period 2 element

Answer:

single-celled, flagella, fresh water, decaying, psuedepodia, cillia, complex, ditches, algae

Explanation:

Euglena are single-celled protists that live in fresh water and move with flagella. Amoeba are found in fresh water and salt water around a lot of dead and decaying material. They move with a psuedepodia. Paramecium are found in fresh water and move with a cillia. This is a single celled organism but is more complex than other organisms. Volvos are found in ponds, ditches and puddles. They are commonly known as algae.

Hope this helped, however this is definitely not chemistry XD

it's a solution there you go

Answer:

Suspension. I am filling up the rest of the 20 characters needed to post.

Atoms of different elements have unique spectral lines because each element has a unique set of electron orbits. The correct option is C.

Spectral lines are dark or bright lines in the spectrum of an object created by absorption or emission of light of a specific wavelength. Spectral lines are generated when electrons in atoms are excited and move from one energy level to another.

When they return to their original energy level, the energy that was absorbed is released in the form of light. Spectral lines are used by astronomers to examine the composition of stars, galaxies, and other astronomical objects.

Atoms of different elements have unique spectral lines because each element has a unique set of electron orbits. Electrons orbit the nucleus in specific energy levels, and the wavelength of light that is absorbed or emitted when an electron moves from one energy level to another is determined by the element's unique electron configuration.

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Answer:

Explanation:

In general, metals will lose electrons to become a positive cation and nonmetals will gain electrons to become a negative anion. Hydrogen is an exception, as it will usually lose its electron. Metalloids and some metals can be can lose or gain electrons.

Answer:

–253.5 °C

Explanation:

We'll begin by calculating the number of mole in 6 g of CO₂. This can be obtained as follow:

Molar mass of CO₂ = 12 + (2×16)

= 12 + 32

= 44 g/mol

Mass of CO₂ = 6 g

Mole of CO₂ =.?

Mole = mass / molar mass

Mole of CO₂ = 6 / 44

Mole of CO₂ = 0.136 mole

Next, we shall convert 225 mL to L.

1000 mL = 1 L

Therefore,

225 mL = 225 mL × 1 L / 1000

225 mL = 0.225 L

Next, we shall determine the temperature of the gas. This can be obtained as follow:

Pressure (P) = 0.855 atm

Volume (V) = 0.225 L

Number of mole (n) = 0.136 mole

Gas constant (R) = 0.0821 atm.L/Kmol

Temperature (T) =?

PV =nRT

0.855 × 0.255 = 0.136 × 0.0821 × T

0.218025 = 0.0111656 × T

Divide both side by 0.0111656

T = 0.218025 / 0.0111656

T = 19.5 K

Finally, we shall convert 19.5 K to degree celsius (°C). This can be obtained as follow:

T(°C) = T(K) – 273

T(K) = 19.5 K

T(°C) = 19.5 – 273

T(°C) = –253.5 °C

Therefore, the temperature of the gas is –253.5 °C

Answer:

I don't know the answer sorry

The graph of the function y = 2x + 3 is attached. See below for the characteristics of the Linear function.

The function provided exhibits qualities of a linear function, having a domain and range that encompass all real numbers.

Its slope or rate of change has a value of 2, while the intercepts are 3 for the y-axis and (-1.5,0) for the x-axis.

The absence of an axis of symmetry or vertex is indicative that this is not a quadratic function. Projectile motion is a practical example of a quadratic function.

Exponential functions, on the other hand, exhibit growth at a certain rate and are defined for all real numbers, with their range being positive real numbers. By studying exponential functions, one may observe exponential decay or growth as portrayed in the table.

Compound interest is an excellent real-world application of this kind of function.

Linear functions help model relations between two variables, quadratic functions can map parabolic forms, while exponential functions account for various growth/decay patterns.

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Answer:

Answers are given below.

Explanation:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1) 0.680 moles of H₂S

0.680 mol × 6.022 × 10²³ molecules / 1mol

4.09× 10²³ molecules

2) 8.96 moles of KI

8.96 mol × 6.022 × 10²³ molecules / 1mol

53.96 × 10²³ molecules

3) 6.500 moles of KClO

6.500 mol × 6.022 × 10²³ molecules / 1mol

39.143 × 10²³ molecules

4) 0.950 moles of NaOH

0.950  mol × 6.022 × 10²³ molecules / 1mol

5.721 × 10²³ molecules

5) 4.73 moles of Na₂CO₃

4.73  mol × 6.022 × 10²³ molecules / 1mol

28.48 × 10²³ molecules

The compound formed when magnesium oxide reacts with water is magnesium hydroxide (Mg(OH)₂).

Magnesium oxide (MgO) is an ionic compound consisting of magnesium cations (Mg²⁺) and oxide anions (O²⁻). When it reacts with water (H₂O), the oxygen atom in water attracts the magnesium cation, leading to the formation of magnesium hydroxide.

The reaction can be represented as follows:

MgO + H₂O → Mg(OH)₂

In the resulting compound, magnesium hydroxide, there are two hydroxide ions (OH-) for every magnesium ion (Mg²⁺). The chemical formula Mg(OH)₂ represents this ratio.

Magnesium hydroxide is an alkaline compound and is commonly used as an antacid to treat heartburn and indigestion. It is also used in various industrial applications.

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The temperature in degrees Celsius that the reaction will go twice as fast is  32.4 ⁰C.

ln(k₂/k₁) = E/R(1/T₁ - 1/T₂)

where;

when rate is twice faster, k₂ = 2k₁ = 2(0.011) s⁻¹ = 0.022 s⁻¹

ln(0.022/0.011) = (45,500/8.31)(1/294 - 1/T₂)

0.693 = 5475.33(1/294 - 1/T₂)

1.2657 x 10⁻⁴ = 1/294 - 1/T₂

1/T₂ = 1/294 - 1.2657 x 10⁻⁴

1/T₂ = 3.275 x 10⁻³

T₂ = 305.4 K = 32.4 ⁰C

Thus, the temperature in degrees Celsius that the reaction will go twice as fast is  32.4 ⁰C.

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We may leverage the knowledge that the total of the percent abundances of all an element's isotopes must be 100%. Let x and y be the Si-29 and Si-30 percent abundances, respectively.

Based on the facts provided, we can then formulate two equations 92.223% + x + y = 100% (total abundance is 100%). (28.086 amu) = (0.92223)(27.9769 amu) + (x)(28.9765 amu) + (y)(29.9738 amu) (average atomic mass is 28.086 amu) When we simplify the first equation, we get: x + y = 7.777% When we plug this into the second equation and solve for x, we get: (28.086 amu) = (0.92223)(27.9769 amu) + (x)(28.9765 amu) + (0.07777)(29.9738 amu) When we simplify and solve for x, we get: x = 4.684% As a result, the Si-29 percent abundance is around 4.684%, and the Si-30 percent abundance may be estimated. y = 100% - 92.223% - 4.684% = 3.093% So, the percent abundance of Si-30 is approximately 3.093%.

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The pressure measurement equivalent to 2.50 atm is 1.90 x 10^3 torr.

The pressure measurement equivalent to 2.50 atm is 1.90 x 10^3 torr. One atmosphere (atm) is defined as the average atmospheric pressure at sea level, which is approximately 760 torr. To convert between different pressure units, it is necessary to use conversion factors. In this case, 1 atm is equal to 760 torr.

Therefore, to find the equivalent pressure in torr, we multiply 2.50 atm by the conversion factor: 2.50 atm * 760 torr/atm = 1900 torr.

Therefore, 2.50 atm is equivalent to 1.90 x 10^3 torr.

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Answer:

the answer is homologous

Hope you have a good day :)

8.52 m is the height of a barometer column based on 1-iodododecane.

A barometer is described as a scientific instrument that is used to measure air pressure in a certain environment.

For the given question we will use the below formula:

P = dgh, where

g = gravitational force = 9.8 m/s²

h = height

First we calculate the height of the barometer column for the mercury:

Density of mercury = 13.6g/ml (given)

Given pressure = 752 torr =100258.144 N/m²

Height of barometer for mercury = 100258.144 / (13.6×9.8) = 752.23= 0.752

Now we calculate the height of barometer by using the below formula:

d₁h₁ = d₂h₂, where

d₁ = density of 1-iodododecane = 1.20g/mol (given)

h₁ = to find?

d₂, h₂ = density & height with respect to mercury

On putting all values in the above equation we get,

h₁ = 13.6×0.752  / 1.20 = 8.52m

Hence, 8.52m is the height of barometer.

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Complete question:

The compound 1-iodododecane is a nonvolatile liquid with a density of 1.20g/ml. the density of mercury is 13.6g/ml. part a what do you predict for the height of a barometer column based on 1-iodododecane, when the atmospheric pressure is 752 torr ?

Answer:

Argon is a noble gas. Noble gases do not bond with others atoms easily because they already have a full outer electron shell :)

73 grammes of hydrochloric acid and 24.3 grammes of magnesium compound will react.

To calculate the amount of magnesium substance that will react with hydrochloric acid weighing 73 g, we need to know the concentration of the hydrochloric acid and the stoichiometric ratio between magnesium and hydrochloric acid.

Assuming the hydrochloric acid is a standard 1 Molar solution and the stoichiometric ratio is 1:2 between magnesium and hydrochloric acid, the equation for the reaction is:
\(Mg + 2HCl - > MgCl_2 + H_2\)

To calculate the amount of magnesium substance needed, we first need to convert the weight of the hydrochloric acid to moles:
73 g \(HCl\) / (36.5 g/mol \(HCl\)) = 2 moles \(HCl\)

Since the stoichiometric ratio is 1:2 between magnesium and hydrochloric acid, we need half as many moles of magnesium:

2 moles \(HCl\) / 2 = 1 mole \(Mg\)
Finally, we can convert moles of magnesium to grams using its molar mass:

1 mole \(Mg\) * 24.3 g/mol \(Mg\) = 24.3 g \(Mg\)
Therefore, 24.3 grams of magnesium substance will react with 73 grams of hydrochloric acid.

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Answer:

10 g H₂SO₄

General Formulas and Concepts:

Chemistry - Stoichiometry

Explanation:

Step 1: Define

Given:   8 g SO₃

RxN:   SO₃ + H₂O → H₂SO₄

Step 2: Identify Conversions

Molar Mass of S - 32.07 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H - 1.01 g/mol

Molar Mass of SO₃ - 32.07 + 3(16.00) = 80.07 g/mol

Molar mass of H₂SO₄ - 2(1.01) + 32.07 + 4(16.00) = 98.09 g/mol

Step 3: Stoichiometry

\(8 \ g \ SO_3(\frac{1 \ mol \ SO_3}{80.07 \ g \ SO_3} )(\frac{1 \ mol \ H_2SO_4}{1 \ mol \ SO_3} )(\frac{98.09 \ g \ H_2SO_4}{1 \ mol \ H_2SO_4} )\) = 9.80042 g H₂SO₄

Step 4: Check

We are given 1 sig fig. Follow sig fig rules and round.

9.80042 g H₂SO₄ ≈ 10 g H₂SO₄

Answer:

2 Fe + 3 H2SO4 —> Fe2(SO4)3 + 3 H2

I hope I helped you^_^

a) K[Au(OH)₄], Au = +3

b) Na₄[Fe(Cl)₆], Fe = +2

(a) K[Au(OH)₄]

Let the oxidation number of Au be X

(+1) + X + 4(-1) = 0

X + 1 - 4 = 0

X - 3 = 0

X = +3

(b) Na₄[Fe(Cl)₆]

Let the oxidation number of Fe be Y

4(+1) + Y + 6(-1) = 0

4 + Y - 6 = 0

Y - 2 = 0

Y = +2

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Answer:

Mutualism is a symbiotic relationship in which both species benefit. Commensalism is a symbiotic relationship in which one species benefits while the other species is not affected. Parasitism is a symbiotic relationship in which one species (the parasite) benefits while the other species (the host) is harmed

Symbiosis is a close relationship between two species in which at least one species benefits.

Mutualism is a symbiotic relationship in which both species benefit.

Commensalism is a symbiotic relationship in which one species benefits while the other species is not affected.

Parasitism is a symbiotic relationship in which one species (the parasite) benefits while the other species (the host) is harmed.

Answer:

B..

Explanation: Internet

Answer:

valence electrons are the electrons that are located in the outermost electron shell of an element. Knowing how to find the number of valence electrons in a particular atom is an important skill for chemists because this information determines the kinds of chemical bonds that it can form and, therefore, the element's reactivity

Explanation: