Which phrase describes the movement of air in general?

A. from high pressure to low pressure
B. from north to south
C. from south to north
D. from low pressure to high pressure

Answer:

To determine whether a substance is an acid or a base, count the hydrogens on each substance before and after the reaction. If the number of hydrogens has decreased that substance is the acid (donates hydrogen ions). If the number of hydrogens has increased that substance is the base (accepts hydrogen ions

Explanation:

The claim that hydrogen chloride (HCl) would be much stronger than nitric acid (HNO3) due to opposing dipole forces is incorrect.

Both HCl and HNO3 are strong acids, meaning that they dissociate completely in water to produce H+ ions. The strength of an acid is determined by the degree to which it dissociates in water. In other words, the stronger the acid, the more H+ ions it produces in water.

The dissociation of HCl and HNO3 in water can be represented as follows:

HCl + H2O → H+ + Cl-

HNO3 + H2O → H+ + NO3-

As we can see, both HCl and HNO3 produce H+ ions in water. Therefore, the strength of an acid cannot be solely determined by its dipole forces.

In addition, it's important to note that HCl is a much more volatile and corrosive acid than HNO3. It can cause severe respiratory and skin irritation when it is inhaled or comes into contact with skin. Therefore, switching HNO3 for HCl could be dangerous and should not be done without proper precautions and expert knowledge

Arsenic contamination of groundwater is a form of groundwater pollution which is often due to naturally occurring high concentrations of arsenic in deeper levels of groundwater.Arsenic contamination of ground water is found in many countries throughout the world, including the US.

To determine the volume of N2(g) produced by the complete decomposition of 1 mole of nitroglycerin (C3H5N3O9), we need to consider the balanced chemical equation for the decomposition reaction.

The balanced equation for the decomposition of nitroglycerin is as follows:

4 C3H5N3O9(s) → 12 CO2(g) + 10 H2O(g) + 6 N2(g) + O2(g) From the balanced equation, we can see that for every 4 moles of nitroglycerin, 6 moles of N2(g) are produced. Since we are considering the decomposition of 1 mole of nitroglycerin, we can use this ratio to determine the moles of N2(g) produced, which is 6/4 = 1.5 moles of N2(g). Now, at STP (Standard Temperature and Pressure), 1 mole of any ideal gas occupies 22.4 liters. Therefore, 1.5 moles of N2(g) would occupy approximately 33.6 liters

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Answer:

the answer would be b

Explanation:

the body sytsem needs to depend on eah other in order to work

Body systems are like runners in a marathon, who each run alone and don't need the other runners to finish the race, is not a good way to describe a body system, hence option B is correct.

Your digestive tract takes nutrients and water from the food you eat in to your body. The body's cells receive oxygen, water, and nutrients through your circulatory system.

Your skin, excretory system, and respiratory system all function to remove wastes from your cells.

Your body's many systems depend on one another to function properly. While your heart's muscles require oxygen from your lungs to beat, your respiratory system depends on your circulatory system to distribute the oxygen it collects.

Therefore, option B is correct.

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Answer:

Iodine has an atomic number of 53 meaning 53 electrons and it gain 1 electron when reacting with a metal. We know the element is a non metal as is gains an electron

Ion is fluoride (F⁻), gaining 1 electron for a stable electron structure like noble gas neon (Ne).

Fluorine (F) is an element with 9 electrons in its neutral state. By gaining 1 electron, it forms the fluoride ion (F⁻) with 10 electrons. This allows the ion to achieve a stable electron configuration, following the octet rule.

Fluoride ions are highly reactive due to their electron configuration and tend to form ionic compounds. They play essential roles in various chemical and biological processes, such as dental health, where fluoride compounds are added to prevent tooth decay.

Fluoride ions' stability and reactivity make them important in various industrial and scientific applications, including the production of fluorine-containing compounds used in refrigerants, plastics, and pharmaceuticals.

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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L}\\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{7.13 \times {10}^{28} }{6.02 \times {10}^{23} } \\ = 118438.538...\)

We have the final answer as

Hope this helps you

Isotopes are the atoms of the same element which have the same atomic number but different mass numbers.

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons. For example, carbon-12, carbon-13, and carbon-14 are three isotopes of the element carbon that all have the same number of protons but differing numbers of neutrons in their atomic nuclei. Since isotopes have the same number of protons, they also have the same atomic number, but because they have different numbers of neutrons, they differ in mass number.

In summary, isotopes are the atoms of the same element which have the same atomic number but different mass numbers.

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Complete combustion of Hydrocarbons with Oxygen will produce CO₂ and H₂O

Combustion of butane (C₄H₁₀) :

\(\tt 2C_4H_{10}+26O_2\rightarrow 8CO_2+10H_2O\)

2.46 g water(H₂O) were produced​

\(\tt \dfrac{2.46}{18}=0.137\)

\(\tt \dfrac{2}{10}\times 0.137=0.0274\)

MW : 58,12 g/mol

\(\tt mass=mol\times MW\\\\mass=0.0274\times 58.12\\\\mass=\boxed{\bold{1.592~g}}\)

8.60 × 1017 photons are produced in a laser pulse of 0.338 J at 505 nm.

The energy of photons is given by E = hc/λ, where E is the energy of the photons, h is Planck’s constant, c is the speed of light, and λ is the wavelength of the light.

To find the number of photons produced, we must first determine the energy of each photon.

The energy of a photon of 505 nm light is given byE = hc/λ = (6.626 × 10-34 J s) (2.998 × 108 m/s)/(505 × 10-9 m)= 3.93 × 10-19 JThus, one photon of 505 nm light has an energy of 3.93 × 10-19 J.

The number of photons produced in a laser pulse of 0.338 J at 505 nm can be found by dividing the total energy of the pulse by the energy of each photon:N = E/EA = 0.338 J / 3.93 × 10-19 J/photonA ≈ 8.60 × 1017 photonsTherefore,

approximately 8.60 × 1017 photons are produced in a laser pulse of 0.338 J at 505 nm.

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Answer: 40cm^3

Explanation:

Since the The air today is approximately one-fifth oxygen, the approximate volume of oxygen in 200cm3 of air would be:

= 1/5 × 200

= 40cm

The answer is 40cm^3

Answer:

Answer:

112.625 mL

Explanation:

Applying,

ML = M'L'.................... Equation 1

Where M = Initial molarity or concentration of calcium chloride, L = initial volume of calcium chloride, M' = Final molarity of calcuim chloride, L' = Final volume of calcuim chloride.

make L the subeject of the equation

L = M'L'/M................ Equation 2

From the question,

Given: M = 1.60 mol/L, M' = 0.34 mol/L, L' = 530 mL

Substitute these values into equation 2

L = (0.34×530)/1.60

L = 112.625 mL

The mass of H2O2 dissolved is not directly provided in the given information. Additional calculations or data are required to determine the mass of H2O2 dissolved.

The mass of hydrogen peroxide (H2O2) dissolved in 100 ml of water is calculated to be approximately X grams.

To determine the mass of H2O2 dissolved, we can use the balanced chemical equation for the reaction between hydrogen peroxide and potassium permanganate:

5H2O2 + 2KMnO4 + 3H2SO4 → 5O2 + 2MnSO4 + 3H2O + K2SO4

From the balanced equation, we can see that the mole ratio between H2O2 and KMnO4 is 5:2.

Given that 21 ml of 1.68 M KMnO4 solution was required for the titration, we can calculate the number of moles of KMnO4 used:

Volume of KMnO4 solution = 21 ml = 0.021 L

Molarity of KMnO4 solution = 1.68 M

Number of moles of KMnO4 = Molarity × Volume

= 1.68 M × 0.021 L

= 0.03528 moles

Using the mole ratio, we can determine the number of moles of H2O2:

Number of moles of H2O2 = (5/2) × Number of moles of KMnO4

= (5/2) × 0.03528 moles

To convert moles of H2O2 to grams, we need to multiply by its molar mass. The molar mass of H2O2 is approximately 34.02 g/mol.

Mass of H2O2 = Number of moles of H2O2 × Molar mass of H2O2

= (5/2) × 0.03528 moles × 34.02 g/mole

The mass of hydrogen peroxide (H2O2) dissolved in 100 ml of water is approximately X grams. This value was determined by titrating the H2O2 solution with a 1.68 M KMnO4 solution, and the titration required 21 ml of the KMnO4 solution. The calculation involved using the balanced chemical equation, molar ratios, and the molar mass of H2O2 to convert the volume of KMnO4 used to the mass of H2O2 dissolved.

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Answer:

The same number of atoms of each element must appear on both sides of a chemical equation. However, simply writing down the chemical formulas of reactants and products does not always result in equal numbers of atoms. You have to balance the equation to make the number of atoms equal on each side of an equation.

Explanation:

1. An ion are atoms or groups of atoms that have a positive or negative charge. 2. When Calcium loses 2 electrons it will have a positive charge. 3. S-2is called the Sulphur ion. 4. A monoatomic ion is made up of a single atom. 5. A molecule is an electrically neutral group of atoms that act as a unit. 6.A covalent compound tends to have low melting and boiling points.

For the neutral atom, the number of protons and electrons are equal. But, they are unequal when the atoms present in the form of ions or the atom has some charges.

When an unequal number of electrons and protons then it leads to the formation of ionic species.

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The rate of chemical reaction in the body is controlled by enzymes

Chemicals go into the body. They enter the body through the mouth, the throat, or (less frequently) the skin. Several are essential to the procedures mentioned above. Some can cause illness or disease because they are "foreign" to the body.

Chemical substances go through typical chemical reactions within the body, including neutralization, hydrolysis, oxidation, and reduction. But they are not random.

Each, however, is a component of a metabolic process. Anabolism, in which the body builds molecules via anabolic pathways, and catabolism, in which the body breaks down molecules through catabolic pathways, are two different types of metabolism.

All are regulated by an assembly of proteins known as enzymes. Biochemical catalysts are called enzymes to change the rate at which reactions occur. But unlike the majority of chemical catalysts, enzymes are extremely selective, promoting just certain responses.

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A weak acid buffer with a strong acid added to it will match option D. The conjugate base neutralizes the hydronium ions.

A weak acid buffer with a strong base added to it will match option A. The acid neutralizes the hydroxide ions.

A weak base buffer with a strong acid added to it will match option B. The base neutralizes the hydronium ions.

A weak base buffer with a strong base added to it will match option C. The conjugate acid neutralizes the hydroxide ions.

A buffer solution is described as an acid or a base aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa.

We know the concept  that buffers work by utilizing their conjugate acid-base pairs to maintain the pH of a solution.

The specific interactions between the components of a buffer and the added strong acid or base is a determining factor on  how they stabilize the pH.

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a) vapor, b) saturated liquid, c) saturated liquid, d) compressed liquid, e) compressed liquid, f) compressed liquid, g) compressed liquid, h) compressed liquid.

The phase of substances in different states using Thermodynamic Properties Tables (in Appendix B) is given below:

a) The phase of water at 60∘C and 60kPa is vapor.

b) The phase of water at 100∘C and 60kPa is saturated liquid.

c) The phase of water at 100∘C and 500kPa is saturated liquid.

d) The phase of water at 25∘C and 120kPa is compressed liquid.

e) The phase of ammonia at -25∘C and 120kPa is compressed liquid.

f) The phase of ammonia at 25∘C and 120kPa is compressed liquid.

g) The phase of R-134a at -25∘C and 120kPa is compressed liquid.

h) The phase of R-134a at 25∘C and 120kPa is compressed liquid.

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Answer:

drying up

agricultural chemicals

Explanation:

The calorimeter constant Ccal for the coffee cup calorimeter is 23.562 J/°C. Option A is correct.

The heat gained by the cooler water is equal to the heat lost by the warmer water when they mix, and can be calculated using the formula:

q = m × c × ΔTwhere:

q =heat gained or lost (in Joules, J)

m = mass of the water (in grams, g)

c = specific heat of water (in Joules per gram per degree Celsius, J/g°C)

ΔT = change in temperature (in degrees Celsius, °C)

We can start by calculating the heat lost by the warmer water:

q₁ = m₁ × c × ΔT₁

where:

m₁ = 25.000 g (mass of the warmer water)

ΔT₁ = (45.00 - 31.40) = 13.60°C (change in temperature of the warmer water)

c = 4.184 J/g°C (specific heat of water)

q₁ = (25.000 g) × (4.184 J/g°C) × (13.60°C) = 1427.872 J

Similarly, we can calculate the heat gained by the cooler water:

q₂ = m₂ × c × ΔT₂

where:

m₂ = 25.00 g (mass of the cooler water)

ΔT₂ = (31.40 - 20.30) = 11.10°C (change in temperature of the cooler water)

c = 4.184 J/g°C (specific heat of water)

q₂ = (25.00 g) × (4.184 J/g°C) × (11.10°C) = 1167.144 J

Since the heat lost by the warmer water is equal to the heat gained by the cooler water, we have:

q₁ = q₂

1427.872 J = 1167.144 J + Ccal × ΔT

where:

ΔT = (31.40 - 23.56) = 7.84°C (change in temperature of the calorimeter and any other contents)

Solving for Ccal, we get:

Ccal = (1427.872 J - 1167.144 J) / (7.84°C)

= 23.562 J/°C

Hence, A. 23.56 is the correct option.

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--The given question is incomplete, the complete question is

"25.000 grams of water at 45.00oC was added to 25.00 grams of water at 20.30oC in a coffee cup calorimeter. Upon mixing, the equilibrium temperature attained by the system was 31.40oC. The specific heat of water is 4.184 J/goC. What is the calorimeter constant Ccal in J/oC for the coffee cup calorimeter?Choice: A) 23.56 B) 232.8 C) 47.14 D) 465.1 "--

Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl

To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7.  Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.

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Answer:

D or C.

Explanation:

Sorry if its wrong

Answer:

A. Rocks along the coast are broken up by waves crashing into the shore.

Explanation:

When an electrolyte dissolves in water, the resulting solution conducts an electric current.

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!

The same conditions of temperature and pressure, three different samples of the same uniform substance will have the same density.

The correct option is 2.

The mass of a specific material per unit volume is known as density. The equation for density is d = M/V, where d represents density, M is mass, and V is volume. Density is often expressed in grams per cubic centimeter.

Absolute density and relative density are the two main types of density. Relative density, also referred to as specific gravity, is the ratio of a product's density to the density of a reference material.

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