Which of the following elements form +1 ions?
A sodium, magnesium, aluminum
B strontium, magnesium, calcium
C lithium, sodium, potassium

Answer:

71%

Explanation:

Answer:

jj

Explanation:

Darwin proposed that natural selection leads to evolution over a long period, while other scientists had different mechanisms or beliefs.

Charles Darwin, an eminent biologist, naturalist, and geologist, is renowned for his theory of evolution and the concept of natural selection.

His groundbreaking ideas revolutionized the scientific community. Darwin's theory differs from other scientists' studies on natural selection in several ways:

1. Darwin proposed that natural selection leads to evolution, a gradual and slow process occurring over an extended period.

He postulated that certain traits are inherited and can impact an organism's survival in a specific environment. These changes accumulate over millions of years, resulting in the evolution of species.

According to Darwin, the fittest organisms that adapt well to their environment have a higher chance of survival and reproduction.

2. Darwin's theory challenged the prevailing belief of creationism, which asserted that all living beings were created in their present form.

Many scientists and religious leaders of the time rejected the concept of evolution, advocating instead for the unique and separate creation of each species.

Creationism failed to explain the diversity of life and the evidence found in the fossil record.

3. Darwin's theory introduced the mechanism of natural selection as the driving force behind evolution, distinguishing it from alternative theories.

For instance, Lamarck proposed the inheritance of acquired traits, while Darwin emphasized the inheritance of only innate traits.

This distinction was significant in shaping the understanding of evolutionary processes.

Darwin's theory of evolution laid the foundation for further scientific advancements, including Gregor Mendel's discovery of the principles of inheritance,

Which further refined our understanding of how traits are passed down through generations.

To know more about Darwin's ideas here: https://brainly.com/question/32821238

#SPJ11

A. The mass of iron that reacted can be calculated by subtracting the mass of excess iron from the total mass of iron used:

Mass of iron that reacted = Total mass of iron used - Mass of excess iron

Mass of iron that reacted = 2.00 g - 1.65 g

Mass of iron that reacted = 0.35 g

B. The moles of bromine that reacted can be calculated using its molar mass:

Molar mass of Br = 79.90 g/mol

Moles of bromine that reacted = Mass of bromine used / Molar mass of Br

Moles of bromine that reacted = 1.00 g / 79.90 g/mol

Moles of bromine that reacted = 0.0125 mol

C. The moles of iron that reacted can be calculated using its molar mass:

Molar mass of Fe = 55.85 g/mol

Moles of iron that reacted = Mass of iron used / Molar mass of Fe

Moles of iron that reacted = 0.35 g / 55.85 g/mol

Moles of iron that reacted = 0.00627 mol

D. The empirical formula can be determined by dividing the moles of each element by the smallest number of moles. The smallest number of moles is 0.00627 mol, which corresponds to iron:

Iron: Moles = 0.00627 mol / 0.00627 mol = 1

Bromine: Moles = 0.0125 mol / 0.00627 mol = 1.99 ≈ 2

Therefore, the empirical formula of iron bromide is FeBr2.

Visit here to learn more about bromine brainly.com/question/29028678

#SPJ11

Answer:

\(V_{base}=6.0mL\)

Explanation:

Hello there!

In this case, by considering that the reaction between sodium hydroxide and hydrochloric acid is in a 1:1 mole ratio of these two reactants, we are able to use the following equation relating the concentration and volume of each one:

\(M_{acid}V_{acid}=M_{base}V_{base}\)

In such a way, by solving for the volume of the base, we will obtain:

\(V_{base}=\frac{M_{acid}V_{acid}}{M_{base}} \\\\V_{base}=\frac{0.5M*24mL}{2.0M}\\\\V_{base}=6.0mL\)

Regards!

The required quantum numbers are;

The term quantum number is used to describe the position of an electron in an atom. Now we know that each electron in atom is defined by four sets of quantum numbers.

Now;

For the circled electron in the arsenic atom, the four quantum numbers are;

Learn more about quantum numbers:https://brainly.com/question/16979660

#SPJ1

Explanation:

First find the mass of 1 mole of water (Molecular mass)

\( H_{2} O = 2H + O \)

\(

= 2(1) + 32 \)

\(

= 34 \: grams

\)

Hence 1 mole of water is 34 g

Compare

1 mole = 34 g

1.33 mole = x g

\( \frac{x}{34} = \frac{1.33}{1} \)

\(

x = 1.33 \times 34 \)

\(

\color{blue}{\boxed{x = 45.2}} \: \: \: \: to \: 3 \: s.f.

\)

Therefore 1.33 moles of water is 45.2 grams

The mass of the substances can be given by the molar mass and the moles of the substances. The mass of 1.33 mole of water is expressed in grams as, 23.94 grams.

The mass has been defined as the product of the moles of the substance and the molar mass in grams per mole. The mass is given in grams and has a formula,

Moles = mass ÷ molar mass

Mass = molar mass × moles

Given,

Moles = 1.33 moles

Molar mass of water (H₂O) is calculated as = 2 (1) + 16= 18 grams per mole

Using the formula of mole, mass is calculated as:

Mass = molar mass × moles

mass = 1.33 × 18

= 23.94 grams

The mass of the substance can be calculated if the value of the molar mass and the moles of the substance has been known. The molar mass of the substance can be calculated by adding the mass of the individual masses of the element in a molecule.

Therefore, 1.33 mol of water contains 23.94 grams.

Learn more about mass, here:

https://brainly.com/question/20970268

#SPJ2

Answer:

1618.2

Explanation:

235+75=310×75=1618.2

Answer:oxygen Explanation:The medical condition described here is anaemia. It is a blood cell disorder whereby the red blood cell doesn't function properly and hence doesn't carry enough oxygen to the tissues. This is usually caused when ones body is deficient of iron.The symptoms that may occur to such patients are weakness, fatigue, headache and pale skin.Based on the explanation, the answer is oxygen

Explanation:

Answer:

H2

Explanation:

Hydrogen gas isn't a compound but it is diatomic when found naturally hence the 2

Answer:

C

Explanation:

Mitochondria provides energy (ATP) for cells to use

Nucleus provides genetic code (DNA)

Ribosomes assemble amino acids chains based on the DNA from nucleus to form proteins

Answer:

c

Explanation:

A hygroscopic substance absorbs moisture or promotes the retention of moisture.

Hygroscopic substances can be found in various forms, including solids, liquids, or even gases. Common examples of hygroscopic substances include salt, sugar, silica gel, certain types of wood, and many chemicals used in industries or laboratories.

The absorption or retention of moisture by hygroscopic substances can have practical applications. For instance, in food preservation, hygroscopic substances can help maintain the moisture content of food products and prevent them from drying out. In pharmaceuticals, hygroscopic ingredients are used to stabilize and control the moisture content of medications.

Overall, hygroscopic substances play a crucial role in moisture management and preservation across various industries and applications.

To know more about the hygroscopic substance refer here :

https://brainly.com/question/31524625#

#SPJ11

The specific exergy of the system is 718 kJ/kg.

Given data:

Mass of Hydrogen (H2) = 3 pounds

Temperature of Hydrogen (H2) = 70 °C

= (70+273.15)

= 343.15 K

Pressure of Hydrogen (H2) = 1.2 MPa

Dead state temperature = 20 °C = (20+273.15) = 293.15 K

Dead state pressure = 101.325 kPa

Properties of hydrogen and water:

Here, we need to calculate the specific exergy of the system by using dead state temperature and pressure.

The specific exergy is defined as the maximum work obtainable when a system is brought to the dead state.

The formula for specific exergy is given as:

Exergy = h - hds

Where,h = specific enthalpy of the system

hds = specific enthalpy of the system at the dead state

We need to first calculate the specific enthalpy of Hydrogen (H2) at 70 °C and 1.2 MPa using the following table:

Hydrogen 70°C, 120k Pa 3162 54.7 4578 11.8

Here, Specific enthalpy of Hydrogen (H2) at 70 °C and 1.2 MPa

(h) = 4578 kJ/kg

Similarly, we need to calculate the specific enthalpy of Hydrogen (H2) at dead state conditions of 20 °C and 101.325 kPa:

Hydrogen 20°C, 101.325 kPa 2650 53.13 3860 11.94

Here,

Specific enthalpy of Hydrogen (H2) at dead state conditions of 20 °C and 101.325 kPa (hds)

= 3860 kJ/kg

Therefore, the specific exergy of the system is:

Exergy = h - hds

Exergy = 4578 - 3860

Exergy = 718 kJ/kg

Therefore, the specific exergy of the system is 718 kJ/kg.

To know more about specific exergy visit:

https://brainly.com/question/13040305

#SPJ11

the actual quantity of nitrogen, phosphorus, and potassium guaranteed to be applied to the maize field is 50 kg, 50 kg, and 25 kg, respectively.

For Nitrogen (N):

The percentage of nitrogen in the fertilizer is 20%. Therefore, the amount of nitrogen applied can be calculated as:

Nitrogen = (20/100) * 250 kg

Nitrogen = 0.2 * 250 kg

Nitrogen = 50 kg

For Phosphorus (P):

The percentage of phosphorus in the fertilizer is also 20%. Thus, the amount of phosphorus applied can be calculated as:

Phosphorus = (20/100) * 250 kg

Phosphorus = 0.2 * 250 kg

Phosphorus = 50 kg

For Potassium (K):

The percentage of potassium in the fertilizer is 10%. So, the amount of potassium applied can be determined as:

Potassium = (10/100) * 250 kg

Potassium = 0.1 * 250 kg

Potassium = 25 kg

learn more about irrigation:

https://brainly.com/question/30090075

#SPJ4

To solve this problem, we can use the combined gas law, which states:

(P1 * V1) / T1 = (P2 * V2) / T2

where:

P1 and P2 are the initial and final pressures of the gas (assumed to be constant)

V1 and V2 are the initial and final volumes of the gas

T1 and T2 are the initial and final temperatures of the gas

In this case, the pressure is assumed to be constant, so we can simplify the equation as follows:

(V1 / T1) = (V2 / T2)

Rearranging the equation to solve for T2, we have:

T2 = (V2 * T1) / V1

Now, let's plug in the given values:

V1 = 9.950 L

T1 = 79.50 °C = 79.50 + 273.15 K (convert to Kelvin)

V2 = 8.550 L

T2 = (8.550 * (79.50 + 273.15)) / 9.950

Calculating the expression, we find:

T2 ≈ 330.07 K

Therefore, the new temperature is approximately 330.07 K.

To know more about combined gas law refer here

https://brainly.com/question/30458409#

#SPJ11

Answer:

It's a Sodium Atom

The density of the cube with sides of 2cm and a mass of 100g is 12.5 g/cm³.

How to calculate the density of the cube?

The density of the object is defined as its mass-per-unit volume. In this case, we know the mass of the cube and we can calculate its volume as the cube of the length of its sides.

The volume of the cube is:

V = (2 cm)³ = 8 cm³

Next, The density can be calculated using the following formula:

Density = mass / volume

Density = 100 g / 8 cm³ = 12.5 g/cm³

Therefore, the density of the cube is 12.5 g/cm³.

To learn more about density, visit: https://brainly.com/question/28348989

#SPJ1

A: Negatively charged ions

B: Hydrophollic molecules

Facilitated diffusion is the spontaneous passive transport of molecules across the biological membrane through the help of a membrane protein. This type of diffusion occurs in the molecules that cannot cross the membrane freely and requires a molecule to enter and leave the membrane.

Negatively charged ions and hydrophobic molecules require facilitated diffusion.

Therefore, option A and B are correct.

Learn more about facilitated diffusion here:

https://brainly.com/question/11240277

Among the given options, only (option ii)  HCl can experience dipole-dipole interactions as a pure substance.

Co₂ and CCl₄ are nonpolar molecules and do not possess permanent dipole moments, hence they cannot undergo dipole-dipole interactions.

Dipole-dipole interactions occur between polar molecules due to the attraction between the positive end of one molecule and the negative end of another. In HCl, the electronegativity difference between hydrogen and chlorine creates a polar bond, resulting in a permanent dipole moment. As a result, HCl molecules can align with each other, attracting the positive end of one molecule to the negative end of another, and experience dipole-dipole interactions.

On the other hand, CO₂ and CCl₄ are both symmetrical molecules with polar bonds, but their molecular geometries result in the cancellation of dipole moments. CO₂ has two polar C=O bonds, but its linear geometry makes the dipole moments of each bond cancel each other out. Similarly, CCl₄ has four polar C-Cl bonds, but its tetrahedral shape leads to the overall cancellation of dipole moments. Therefore, neither CO₂ nor CCl₄ can exhibit dipole-dipole interactions as pure substances.

To learn about more substance click here:

brainly.com/question/13320535

#SPJ11

Answer:

Explanation:

weighs equal to 22 g. Find out its molecular mass .  Molecular mass of gas = 44 amu

The major distinction between emission and absorption spectra is that an emission spectrum has various colored lines, whereas an absorption spectrum contains dark-colored lines. When electrons return to their original energy levels, this is called emission. When electrons absorb energy, they leap to higher energy levels. When ground-state atoms absorb energy from a radiation source, atomic absorption spectra are created. When neutral atoms in an excited state return to the ground state or a lower-energy state, they release energy, resulting in atomic emission spectra.

1930 Coulombs of   charge or electricity are used when a current of 0.2 A is passed through dilute sulphuric acid for 9650 s.

An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is measured as the net rate of flow of electric charge through a surface or into a control volume.The moving particles are called charge carriers, which may be one of several types of particles, depending on the conductor. In electric circuits the charge carriers are often electrons moving through a wire.

Charge is calculated as Q=It=0.2×9650=1930 C.

Learn more about charge,here:

https://brainly.com/question/19886264

#SPJ1

Answer:

12 and 20 moles ratios, respectively.

Explanation:

Note that the number of mole ratios you can write for a chemical reaction involving a total of n substances is (n)(n–1). Thus, for reactions involving four and five substances, you can write 12 and 20 moles ratios, respectively.

*** HOPE IT HELPS! :)

Answer:

please where are the rest of the questions you want to ask

Answer: A

Explanation:

It is used in the design of engines, where changes in pressure and temperature are used to convert thermal energy into mechanical work. It is also used in meteorology to predict weather patterns and in the study of the Earth's atmosphere.

Pressure and temperature are two fundamental physical quantities that are closely related in many physical processes. Understanding the relationship between these two quantities is essential in many scientific and engineering fields. This relationship can be described by the ideal gas law, which states that the pressure of an ideal gas is directly proportional to its temperature when the volume and number of particles are constant. In other words, when the temperature of a gas increases, its pressure increases, and vice versa. This can be explained by the kinetic theory of gases, which assumes that gases are made up of a large number of small particles that are in constant motion. The speed of these particles is proportional to the temperature of the gas. As the temperature of the gas increases, the particles move faster and collide more frequently with the walls of the container, resulting in an increase in pressure. Similarly, when the temperature of the gas decreases, the particles move slower and collide less frequently with the walls of the container, resulting in a decrease in pressure. This relationship between pressure and temperature is essential in many scientific and engineering applications.

for more questions on meteorology

https://brainly.com/question/16565664

#SPJ8

Answer:

8.9x1023

Explanation:

Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

The pH after the following volumes of titrant have been added 0 ml 20 mL 59. 1 mL 60. 0 mL 71. 4 mL 73. 4 mL are 11.89, 11.89, 8.45, 8.45, 7.98, 8.95 respectively.

The reaction between NH3 and HCl can be represented by the following equation: NH3 + HCl → NH4+ + Cl-

To calculate the pH after different volumes of titrant have been added, we need to determine the amount of titrant that has reacted with the analyte and the resulting concentration of the products.

A. 0 mL of titrant (initial state)

At the start, there is no titrant added to the analyte, so the concentration of NH3 is 0.050 M. NH3 is a weak base, so we can use the Kb expression to calculate the concentration of OH-:

\(Kb = [NH4+][OH-] / [NH3]\)

\(1.8 * 10^{-5} = x^2 / (0.050 - x)\)

initial concentration of NH3 is much greater than the initial concentration of HCl, we can assume that the concentration of NH3 does not change significantly during the titration.

\(Kb = x^2 / 0.050\\x = \sqrt{Kb * 0.050} = 1.3 * 10^{-3} M\)

The concentration of OH- is equal to \(1.3 * 10^{-3} M\), so we can calculate the pH:

\(pH = 14 - pOH = 14 - (-log[OH-]) = 11.89\)

Therefore, the pH at the start of the titration is 11.89.

B. 20 mL of titrant

After adding 20 mL of 0.025 M HCl, the volume of the solution is 50 mL (30 mL NH3 + 20 mL HCl). The moles of HCl added is:

moles of HCl = volume x concentration = 0.020 L x 0.025 mol/L = 5 x 10^-4 mol

Since the reaction is a 1:1 reaction, the moles of NH3 remaining is equal to the moles of HCl added.

concentration of NH3 = moles of NH3 / volume of NH3 = (0.050 mol/L x 0.030 L - 5 x 10^-4 mol) / 0.030 L = 0.048 mol/L

Since the concentration of NH3 has decreased, we need to recalculate the concentration of OH- using the new concentration of NH3:

\(Kb = [NH4+][OH-] / [NH3]\\1.8 * 10^{-5} = x^2 / (0.048 - x)\)

Solving for x, we get:

\(x = 1.3 * 10^{-3} M\)

The concentration of OH- is still \(x = 1.3 * 10^{-3} M\), so we can calculate the pH:

pH = 14 - pOH = 14 - (-log[OH-]) = 11.89

Therefore, the pH after adding 20 mL of titrant is still 11.89.

Similarly for  C. 59.1 mL of titrant

The pH after adding 59.1 mL of titrant is 8.45.

D. 60 mL of titrant

The pH after adding 60 mL of titrant is 8.45.

E. 71.4 mL of titrant

The pH after adding 71.4 mL of titrant is 7.98.

F. 73.4 mL of titrant

The pH after adding 73.4 mL of titrant is 8.95.

For more question on pH click on

https://brainly.com/question/12609985

#SPJ11

The work function of the metal is obtained as 5.1 eV

The cutoff frequency is the frequency below which photo electric effect can not occur as electrons are not removed from the metal surface.

Now;

fo = 1.22 x 10^15 Hz

Wo = hfo

Wo = 6.6 * 10^-34 * 1.22 x 10^15

Wo = 8.1 * 10^-19 J

If 1 eV = 1.60 x 10-19 J

x eV = 8.1 * 10^-19 J

x = 8.1 * 10^-19/ 1.60 x 10-19

x = 5.1 eV

Learn more about cutoff frequency:https://brainly.com/question/14378802

#SPJ1