Which biome has a cold climate, with very little precipitation?



a


Rain Forest


b


Tundra


c


Grassland


d


Taiga

Answer:

nitric acid + iron=iron+[nitric acid ] 2 hydrogen

The net ionic equation will be Fe → \(Fe^{2+}\).

The net ionic equation would be a chemical equation which only indicates the elements, compounds, as well as ions instantly involved in a chemical reaction.

The given chemical equation is:

HNO3+Fe → Fe(HNO3)2 +H2​

It can be written in term of ionic equation.

\(H^{+}\) + \(NO_{3}^{-}\)+Fe → \(Fe^{2+}\) + \(H^{+}\) + \(NO_{3}^{-}\)

Hydrogen ion and nitrate ion will be canceled each other.

Hence, the net ionic equation will be

Fe → \(Fe^{2+}\)

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Answer:

3850g

Explanation:

Solubility is the amount of solute dissolved in a solvent.

Solubility is mass of solute÷mass of solvent

The solvent is 35grams

Solute?

Solubility of solute is 110

110=x/35

= 110 × 35

The amount of residue solute is 3850g

Explanation:

Space exploration was aided most by the use of liquid fuel.

Hope this helps..

Explanation:

For us to answer these questions, we have to know two formulas:

Therefore:

a) particles of Na = 1.50 mol × (6.022 × 10²³) particles/mol

                            = 9.033 × 10²³ particles

b) particles of Pb = 6.755 mol × (6.022 × 10²³) particles/mol

                            = 4.068 × 10²⁴ particles

c) particles of Si

             = (7.02 g ÷ 28.085 g/mol) × (6.022 × 10²³) particles/mol

             = 1.51 × 10²³ particles

Answer: C

Explanation:

Don’t trust the other person it’s not A

*view photo for answer*

pay attention! the answer choices aren't always in the same order!

Answer: Your teacher is correct, although yes not every element has a charge of 0.

Explanation:

Atoms are electrically neutral because they contain equal quantities of positively charged protons and negatively charged electrons. Electrons and protons have equal but opposite charges, so the result is no net charge.

Approximately 71.54% of the mass of galantamine is composed of carbon atoms. Galantamine is a compound used to treat Alzheimer's disease.

To determine the percentage of carbon by mass, we first need to calculate the molar mass of the compound.

The molar mass of carbon (C) is 12.01 g/mol, hydrogen (H) is 1.01 g/mol, nitrogen (N) is 14.01 g/mol, and oxygen (O) is 16.00 g/mol. Using these values, we can find the molar mass of galantamine:
Molar mass = (17 × 12.01) + (19 × 1.01) + (14.01) + (3 × 16.00) = 204.17 + 19.19 + 14.01 + 48.00 = 285.37 g/mol

Now that we have the molar mass, we can calculate the percentage of carbon by mass in the compound:
Percentage of carbon = (Mass of carbon in the compound / Total molar mass) × 100
Percentage of carbon = [(17 × 12.01) / 285.37] × 100 = (204.17 / 285.37) × 100 ≈ 71.54%

Thus, approximately 71.54% of the mass of galantamine is composed of carbon atoms.

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Answer:

c

Explanation:

1 mole of an alcohol are needed to react with 1 mole of an aldehyde to form a hemiacetal.

Alcohol and ether are joined to the same carbon atom as hemiacetals. Hydrogen is positioned at the fourth bonding position. To create a hemiacetal, 1 mole of an alcohol must react with 1 mole of an aldehyde. When an aldehyde and an alcohol interact, a hemiacetal is created. This can happen in one of two ways: as a neutral reaction or catalyzed by an acid. Only the alcohol and the aldehyde are involved in the neutral reaction. The carbon is attacked by the alcohol. The oxygen is forced to receive those extra electrons. Therefore, the ether has a positive charge while the oxygen has a negative charge. In order to create the hemiacetal, the additional proton (hydrogen) on the ether can then be transferred to the oxygen.

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During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil.

Once the carbon dioxide takes up the plant, the process starts with the help of sunlight and water. During this procedure, the plant combines carbon dioxide with water to let the plant extract what it needs for food.

So which statement best explain the movement of carbon dioxide and oxygen during photosynthesis so uh carbon dioxide literally moves into a plant, whereas oxygen will move out and we know this is very major for us because we release carbon dioxide, and then plants release oxygen.

So we can conclude that Carbon dioxide and oxygen cannot pass through the cuticle, but proceed in and out of leaves through an aperture called stomata.

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Answer: The added pressure could cause pilots to become disorinated

Explanation:

Answer:

When sound molecules stack up in front of high-speed flights, loud noises are produced that can damage the ears.

Answer:

This is because water molecules are made of atoms. Atoms may have special ends that attract to each-other magnetically, causing the water to look like it merges into 2 different drops.

To determine the pH of a solution using a pH indicator paper, you need a color chart or a color scale that corresponds to different pH values.

This color chart or scale is used to compare the color of the pH indicator paper after it has been immersed in the solution. The pH indicator paper is impregnated with a universal pH indicator, which is a chemical compound that changes color depending on the acidity or alkalinity of the solution.

The indicator undergoes a chemical reaction with the hydrogen ions (H+) or hydroxide ions (OH-) present in the solution, resulting in a color change.

By comparing the color of the pH indicator paper with the color chart or scale, you can determine the approximate pH of the solution. The color chart usually provides a range of colors corresponding to different pH values, allowing you to match the observed color to the nearest pH value.

In the hypothesis mentioned, the aim is to calibrate a cabbage pH indicator using the pH values obtained from a universal pH indicator. Therefore, in addition to the pH indicator paper and color chart, you would also need a range of solutions with known pH values to establish a calibration curve specific to the cabbage pH indicator.

In summary, to determine the pH of a solution using a pH indicator paper, you need a color chart or scale that correlates the observed color of the pH indicator paper with different pH values. This chart or scale serves as a reference for interpreting the color change and determining the pH of the solution.

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Answer: COLOR KEY

Explanation: CS

Answer:

An object has potential energy (stored energy) when it is not in motion. Once a force has been applied or it begins to move the potential energy changes to kinetic energy (energy of motion).

Therefore, true. (Also would u mind giving brainliest, you don't have to hehe)

The statement "molecules move in random directions when heated in a heat engine, and because of the lack of uniformity in the direction of molecular movement" is true.

When a heat engine is heated, molecules absorb heat energy and their kinetic energy increases. The kinetic energy of molecules causes them to move around. However, this movement is not uniform, and the molecules move in random directions.

A heat engine is a device that converts thermal energy into mechanical energy. Heat engines operate on the principle of thermodynamics.

They work by taking in thermal energy from a high-temperature reservoir, converting some of it into mechanical energy, and then releasing the remaining thermal energy to a low-temperature reservoir.The internal combustion engine in a car, the steam engine in an old locomotive, and the turbine in a power plant are all examples of heat engines. They all convert heat energy into mechanical energy to perform work.

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Answer:

The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element. ... The sum of the atomic number Z and the number of neutrons N gives the mass number A of an atom.

Answer:

Atoms of each element contain a characteristic number of protons. In fact, the number of protons determines what atom we are looking at (e.g., all atoms with six protons are carbon atoms); the number of protons in an atom is called the atomic number.

Explanation:

Answer:

the electrons in them can move around easily

Explanation:

Answer:

The electrons in them being able to move around easily, and them being able to carry heat from one part to another.

The physical changes that are taking place at points X and Z are melting and vaporization respectively.

The melting point of sodium chloride added to this substance will increase.

The relationship between the supply temperature of the heating system and the outside air temperature is known as the heating curve.

In a heating curve of a pure solid, the two points of phase change are the melting point when the solid melts and the boiling point when the liquid vaporizes.

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The conjugate acid has one more H+ ion than the base and its chemical formula is written with H+ as the cation.

In order to draw the conjugate acid for a base, it is important to understand the concept of Bronsted-Lowry acids and bases. According to the Bronsted-Lowry theory, an acid is a substance that donates a proton (H+) and a base is a substance that accepts a proton.To draw the conjugate acid for a base, you need to add a proton to the base. The conjugate acid will have one more H+ ion than the base and its chemical formula will be written with H+ as the cation. For example, NH3 is a base and its conjugate acid is NH4+.

Here are a few steps to draw the conjugate acid for a base:

1. Identify the base that you want to draw the conjugate acid for.

2. Add a proton (H+) to the base.

3. Write the chemical formula for the conjugate acid, with H+ as the cation.

For example, let's say the base is OH-. The conjugate acid will be H2O, since H+ will be added to OH- to form H2O.OH- + H+ → H2O

Therefore, the conjugate acid for the base OH- is H2O.In conclusion, the conjugate acid for a base is obtained by adding a proton to the base.

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Answer:

a

Explanation:

Answer:

B

Explanation:

Formal charges represent the actual charges on atoms in a molecule.

The formal charge can be used to determine the most plausible Lewis structure for a given compound.

A formal charge is defined as the charge that is assigned to an atom in a molecule in which we assume that electrons in all chemical bonds are shared equally between two atoms without relative electronegativity. The formula for assigning formal charge to atoms in the Lewis structures is given below:

Formal charge = Number of valence electrons - (number of lone-pair electrons + half number of bonding electrons).

''Lone pair electrons" are also called "nonbonding pairs" or "unshared pairs".  When an atom has several bonds and a complete octet shell, then its formal charge is 0. Formal Charge is the charge of an atom in a molecule or ion in which all of the bonding electrons were divided between atoms in the bond equally.

So we can conclude that options A and C are the correct answer.

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When the temperature is decreased to 150 K while keeping the pressure constant at 1.5 atm, the new volume would be 1.15 L. The volume decreases from the initial volume of 2.3 L to the new volume of 1.15 L.

According to the ideal gas law, the relationship between pressure (P), volume (V), and temperature (T) of a gas is given by;

PV = nRT

Where; P = pressure (in atm)

V = volume (in liters)

n = number of moles of gas

R = ideal gas constant (0.0821 L·atm/(mol·K))

T = temperature (in Kelvin)

In this case, the pressure is constant at 1.5 atm. The initial temperature is 300 K, and the initial volume is 2.3 L. The chemist then decreases the temperature to 150 K while keeping the pressure constant.

To determine the new volume, we can use the combined gas law, which relates the initial and final conditions of pressure, volume, and temperature;

(P₁ × V₁) / T₁ = (P₂ × V₂) / T₂

Substituting the given values;

(1.5 atm × 2.3 L) / 300 K = (1.5 atm × V₂) / 150 K

Simplifying the equation;

(1.5 × 2.3) / 300 = 1.5 × V₂ / 150

0.0115 = 1.5 × V₂ / 150

V₂ = (0.0115 × 150) / 1.5

V₂ = 1.15 L

Therefore, the new volume would be 1.15 L.

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The empirical formula for calcium bromide has been \(\rm CaBr_2\).

The empirical formula has been given with the simplest whole number ratio of the chemical formula.

The moles of calcium in calcium bromide has been:

\(moles=\dfrac{mass}{mwt}\)

\(moles_C_a=\dfrac{0.2}{40} \\moles_C_a=0.005\)

The moles of bromine in calcium bromide has been:

\(moles_B_r=\dfrac{0.8}{80} \\moles_B_r=0.01\)

The simplest whole number ratio for Br and Ca has been given by dividing moles of Ca and Br with moles of Ca.

\(\rm Ca=\dfrac{0.005}{0.005} \\Ca=1\)

\(\rm Br=\dfrac{0.01}{0.005} \\Br=2\)

From the whole numbers, the empirical formula for calcium bromide has been \(\rm CaBr_2\).

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The nearest electron would need to be approximately 0.7000000001 meters away in the scale model.

To determine the distance between the nucleus and the nearest electron in the scale model, we can use the given variables and proportions. Let's consider the nucleus diameter as d = 1.4 m. In the scale model, the radius of the nucleus would be half of the diameter, so the radius would be 0.7 m (half of 1.4 m).

The distance between the nucleus and the nearest electron can be approximated by adding the orbital radius of an electron to the radius of the nucleus. Therefore, the distance would be approximately:

\(0.7 m + 10^{(-10)} m = 0.7 m + 0.0000000001 m\) ≈ 0.7000000001 m.

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Answer:27

Explanation:

Took the test

Answer:

30 slices of pie

Explanation:

10 colleges = 30 essays

30 essays= 60 hours of work

60 hours = ( 500*60)

30,000 calories expended = 30 slices of pie

I wouldn't recommend eating that much pie.

The mass of Cl ion present in 300 mL of water is 5.1 mg.

Given data,

The concentration of Cl ion in a sample of water = 17 ppm

Volume of the water sample = 300 mL

To find the mass of Cl ion present in the given water sample, we can use the formula of the concentration of a solution which is given as;

Concentration of a solution = Mass of the solute / Volume of the solution

In the given problem, the concentration of Cl ion in the solution is given as 17 ppm, so we can convert it to the concentration in grams by dividing it by 1000000.

Hence the concentration of Cl ion in the solution can be written as;17 ppm = 17/1000000 g / mL

To find the mass of Cl ion present in the given water sample of 300 mL we will use the formula of concentration of the solution;

Mass of Cl ion = Concentration of Cl ion × Volume of solution Mass of Cl ion = 17/1000000 g / mL × 300 mL Mass of Cl ion = 5.1 × 10⁻³ g = 5.1 mg

Therefore, the mass of Cl ion present in 300 mL of water is 5.1 mg. Hence option (c) is correct.

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Answer: Non living things are inanimate objects or forces with the ability to influenceshape alter a habitatand impact its life.

Explanation:

Some examples of nonliving things include rocks water weather climate and natural events such as rockfalls or earthquakes.