Which of the statements is correct regarding catalysts ( click 4 that apply )

Catalyst increase the rate of reaction

Catalyst decrease the rate of reaction

Catalyst increase the activation energy needed to start a reaction

Catalyst decrease the activation energy needed to start a reaction

They are used up in the reaction

They are not used up in the reaction

Catalyst are very specific

Catalyst are not very specific

Answer:

positively charged (+2).

4th element on the periodic table

I don't know what else to say srry if I failed my mission :')

An atom with 4 protons and 2 electrons can be expressed as a cation with a charge of 2⁺ if it has lost electrons or as a neutral atom if it hasn't undergone any electron changes.

An ion is an atom or molecule that has gained or lost electrons, resulting in an electrical charge. In this case, you've provided an atom with 4 protons and 2 electrons. To express this as an ion, we need to determine whether it has gained or lost electrons and the resulting charge.

If the atom has lost electrons:

An atom loses electrons when it becomes positively charged (cation).

In this scenario, with 4 protons and 2 electrons, it has lost 2 electrons.

This results in a net positive charge of 2⁺. So, the ion is written as:

Ion: Cation with a charge of 2⁺

For example, this could be a helium atom (He) that has lost its 2 electrons, becoming He²⁺.

If the atom has gained electrons:

An atom gains electrons when it becomes negatively charged (anion).

In this case, with 4 protons and 2 electrons, it has not gained or lost any electrons, maintaining a neutral charge.

Ion: Neutral Atom

So, depending on whether the atom gained or lost electrons, it can either be a cation with a charge of 2⁺ (if it lost electrons) or simply a neutral atom (if it maintained its original electron count).

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Answer:

Photosynthesis

Explanation:

Photosynthesis:

It is the process in which in the presence of sun light and chlorophyll by using carbon dioxide and water plants produce the oxygen and glucose.  The oxygen produced during photosynthesis is used in cellular respiration.

The sun light is converted into chemical energy in the form of sugar.

Word equation:

Carbon dioxide + water + energy →   glucose + oxygen

water is supplied through the roots, carbon dioxide collected through stomata and sun light is capture  by chloroplast.

Chemical equation:

6H₂O + 6CO₂ + energy  →   C₆H₁₂O₆ + 6O₂

it is known from balanced chemical equation that 6 moles of carbon dioxide react with the six moles of water and created one mole of glucose and six mole of oxygen.

Answer:

Heat required to melt 26.0 g of ice at its melting point is 8.66 kJ.

Explanation:

Number of moles of water in 26 g of water: 26× [tex]\frac{1}{18.02}[/tex] moles

                                                                      =1.44 moles

The enthalpy change for melting ice is called the entlaphy of fusion. Its value is 6.02 kj/mol.

we have relation as:

                                           q = n × ΔH

where:

q  = heat

n  = moles

Δ H  = enthalpy

So calculating we get,

                                        q= 1.44*6.02 kJ

                                        q= 8.66 kJ

We require 8.66 kJ of energy to melt 26g of ice.

In polymer science, the backbone chain of a polymer is the longest series of covalently bonded atoms that together create the continuous chain of the molecule.

Thermal energy

Mechanical energy

Chemical energy

Answer:

electromagnetic

Explanation:

Absolute time is measured using fixed units, with early methods involving hourglasses using sand, and modern methods using atomic oscillations. Calendars derive from celestial motions, with years, months, and days based on Earth and the Moon's movements.

Absolute time is the measurement of time in fixed units such as seconds, minutes, days, and years. There are two main ways to record or measure absolute time: one is based on the duration of events, and the other is through periodic motion.

Early methods of measuring time duration included devices like hourglasses that used the flow of sand to measure the passing of time. Today, precise measurement of time uses the oscillation of physical phenomena, such as the vibration of a cesium atom to define a second.

As for periodic motion, our common calendar is derived from celestial movements: years from Earth's orbit around the Sun, months from the Moon's orbit around Earth, and days from Earth's rotation on its axis. These are fundamental in tracking the passage of time in our daily lives.

The _HIGHER__ vapor pressure at high altitudes causes a liquid to boil at a _LOWER___ temperature.

Explanation:

Vapor pressure is the pressure applied by the molecule of a liquid at the surface of the liquid as it transitions into a gaseous phase. When the vapor pressure exceeds the atmospheric pressure, this is when the liquid begins to boil. Therefore when the atmospheric pressure is low, then the liquid will boil at lower temperatures, because the vapor pressure of the liquid will overcome the atmospheric pressure at lower temperatures.

Answer:

The reduced vapor pressure at high altitudes causes a liquid to boil at a lower temperature.

Explanation:

A liquid will change its form when its vapor pressure higher than the atmospheric pressure. At higher altitudes, the air pressure will be lower since there will be less air above your head compared to the sea level. This means the atmospheric pressure will be lower, and the vapor pressure needed for the liquid will be reduced.  

The pressure is directly proportional to temperature. Since the vapor pressure required is lower, the liquid can start to boil at a lower temperatures.

Answer:

Density=1.25g/dm^3

Explanation:

Density=mass/volume

Mass of nitrogen gas is 2(14)=28g

Volume at STP=22.4dm^3

Density=28/22.4=1.25g/dm^3

The mass is the molar mass of N₂ (28.01 g) and the volume is 1.25 L

To calculate the density of nitrogen gas at STP using the molar volume of a gas at STP, you can follow these steps:

1. Understand the concept: Molar volume of a gas at STP (Standard Temperature and Pressure) is 22.4 L/mol.

2. Determine the molar mass of nitrogen: The molar mass of nitrogen (N2) is approximately 28.02 g/mol.

3. Use the ideal gas law: The ideal gas law states that PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature.

4. Calculate the number of moles: Since the molar volume at STP is 22.4 L/mol, and the volume is equal to 22.4 liters, the number of moles of nitrogen gas is 1 mole.

5. Calculate the density: Density (ρ) is defined as mass divided by volume. Since we have one mole of nitrogen gas, which weighs 28.02 grams, we can calculate the density as follows:

Therefore , the density of nitrogen gas at STP is 1.25 g/ L

Answer:

The molar mass of the gas is 32.03 g/mol

Explanation:

Pressure of gas = P = 0.961 atm

Volume occupied by gas = V = 1.00 L

Temperature = T = 27[tex]^{\circ}C[/tex] = 300 K

Assuming M g/mol be the molar mass of the gas and the gas behaves as an ideal gas.

The ideal gas equation is shown below

[tex]\textrm{PV} =\textrm{nRT} \\\textrm{PV} = \displaystyle \frac{m}{M}\textrm{ RT } \\0.961 \textrm{ atm}\times 1.00 \textrm{ L} = \displaystyle \frac{1.25 \textrm{ g}}{M}\times 0.0821 \textrm{ L.atm.mol}^{-1}.K^{-1}\times 300\textrm{K} \\M = 32.03 \textrm{ g/mol}[/tex]

Molar mass of given sample of gas = 32.03 g/mol

Answer:

What picture

Explanation:

Final answer:

Analyzing a photograph involves considering the context, motivations, and physical evidence within the image to determine why certain events are depicted. The underlying causes for events, whether in human behavior or natural processes, such as global warming from carbon dioxide, are critical for understanding the scene. The perspective of the photographer and the choice of images by editors also significantly influence the narrative constructed around the photograph.

Explanation:

Understanding the event depicted in a photograph requires analyzing various factors such as the context of the image, the physical and emotional states of any subjects present, and the environment. For example, a photo capturing a table with items like a cup, saucer, newspaper, and tickets might suggest a moment of daily life, perhaps the morning routine of an individual. However, these items could also indicate a broader story, perhaps of travel plans (suggested by the tickets), a reflection of personal habits or interests (indicated by the newspaper choice), or even the socioeconomic status of the individual (suggested by the type of cup and saucer).

Furthermore, understanding why certain events occur, whether in human behavior or physical sciences, involves identifying the underlying causes. For instance, the example of carbon dioxide trapping heat in the atmosphere to warm the planet serves as a clear illustration of how and why certain events, like global warming, occur.

In the case of human behavior captured in photographs, motivations such as love, hate, envy, greed, or a desire for power could play a crucial role in explaining the scene. The choice of angle and perspective by the photographer, as well as the decision by a newspaper editor to publish a particular image, further add layers of meaning, revealing not just the moment captured but also the storytelling intent behind it.

Final answer:

To find the new volume of the gas when the pressure changes from 99.6 kPa to 93.3 kPa, one applies Boyle's Law, resulting in a new volume of 4.53 L.

Explanation:

The question involves using Boyle's Law, which states that for a given mass of ideal gas at constant temperature, the product of pressure and volume is constant. In the given example, the initial condition is a volume of 4.23 L of gas at a pressure of 99.6 kPa. When the pressure changes to 93.3 kPa, we want to find out what the new volume of the gas will be, assuming temperature and amount remain constant. We can use the equation:

P1 * V1 = P2 * V2

Where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume respectively. Plugging in the initial conditions and solving for V2 gives us the formula:

V2 = (P1 * V1) / P2

Inserting the values:

V2 = (99.6 kPa * 4.23 L) / 93.3 kPa = 4.53 L

So the new volume of the gas will be 4.53 L after the pressure has been adjusted to 93.3 kPa.

Cadaverine, a foul-smelling substance produced by the action of bacteria on meat, contains 58.55% C, 13.81% H, and 27.40% N by mass. The empirical formula of cadaverine is C2H7N.

Cadaverine is a foul-smelling substance produced by the action of bacteria on meat. It contains 58.55% C, 13.81% H, and 27.40% N by mass, and its molar mass is 102.2 g/mol.

To determine the empirical formula of cadaverine, we need to find the ratio of the number of atoms in the compound. We can assume a 100 g sample, which means we have 58.55 g of carbon (58.55% of 100 g), 13.81 g of hydrogen, and 27.40 g of nitrogen.

To find the moles of each element, we divide the mass by its molar mass:

Now, we divide each mole value by the smallest mole value (1.96) to get the simplest whole number ratio:

Since we can't have fractions in a molecular formula, we round each ratio to the nearest whole number:

Therefore, the empirical formula of cadaverine is C2H7N.

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Final answer:

Cadaverine is a diamine with a strong odor, resulting from bacterial decarboxylation of lysine in decaying meat. It is composed of C, H, and N, with a foul smell characteristic of decomposing animal matter. Aromatic amines, unlike cadaverine, are toxic and used industrially.

Explanation:

Cadaverine is a foul-smelling substance that is produced by the action of bacteria on meat. It contains 58.55% carbon (C), 13.81% hydrogen (H), and 27.40% nitrogen (N) by mass, and has a molar mass of 102.2 g/mol. This compound, along with another diamine called putrescine, is a result of the decarboxylation of amino acids, ornithine and lysine. These processes are part of what gives decaying animal matter its characteristic unpleasant odor. Amines like cadaverine are formed during the breakdown of proteins and often have odors associated with decay or putrefaction.

In contrast, aromatic amines are generally toxic and can be absorbed through the skin, requiring careful handling. They are used in industry in products like dyes and drugs but can be potent carcinogens.

Answer :

(i) The number of atoms present in 7 g of lithium are, [tex]6.07\times 10^{23}[/tex]

(ii) The number of atoms present in 7 g of lithium are, [tex]1.204\times 10^{24}[/tex]

(iii) The number of moles of [tex]F_2[/tex] is, 1 mole

The number of moles of [tex]CO_2[/tex] is, 0.5 mole

The number of moles of [tex]OH^-[/tex] is, 1 mole

Explanation :

Part (i) :

First we have to calculate the moles of lithium.

[tex]\text{Moles of }Li=\frac{\text{Mass of }Li}{\text{Molar mass of }Li}[/tex]

Molar mass of Li = 6.94 g/mole

[tex]\text{Moles of }Li=\frac{7g}{6.94g/mol}=1.008mole[/tex]

Now we have to calculate the number of atoms present.

As, 1 mole of lithium contains [tex]6.022\times 10^{23}[/tex] number of atoms

So, 1.008 mole of lithium contains [tex]1.008\times 6.022\times 10^{23}=6.07\times 10^{23}[/tex] number of atoms

Thus, the number of atoms present in 7 g of lithium are, [tex]6.07\times 10^{23}[/tex]

Part (ii) :

First we have to calculate the moles of carbon.

[tex]\text{Moles of }C=\frac{\text{Mass of }C}{\text{Molar mass of }C}[/tex]

Molar mass of C = 12 g/mole

[tex]\text{Moles of }C=\frac{24g}{12g/mol}=2mole[/tex]

Now we have to calculate the number of atoms present.

As, 1 mole of carbon contains [tex]6.022\times 10^{23}[/tex] number of atoms

So, 2 mole of carbon contains [tex]2\times 6.022\times 10^{23}=1.204\times 10^{24}[/tex] number of atoms

Thus, the number of atoms present in 7 g of lithium are, [tex]1.204\times 10^{24}[/tex]

Part (iii) :

To calculate the moles of [tex]F_2[/tex] :

[tex]\text{Moles of }F_2=\frac{\text{Mass of }F_2}{\text{Molar mass of }F_2}[/tex]

Molar mass of [tex]F_2[/tex] = 38 g/mole

[tex]\text{Moles of }F_2=\frac{19g}{19g/mol}=1mole[/tex]

Thus, the number of moles of [tex]F_2[/tex] is, 1 mole

To calculate the moles of [tex]CO_2[/tex] :

[tex]\text{Moles of }CO_2=\frac{\text{Mass of }CO_2}{\text{Molar mass of }CO_2}[/tex]

Molar mass of [tex]CO_2[/tex] = 44 g/mole

[tex]\text{Moles of }CO_2=\frac{22g}{44g/mol}=0.5mole[/tex]

Thus, the number of moles of [tex]CO_2[/tex] is, 0.5 mole

To calculate the moles of [tex]OH^-[/tex] ions :

[tex]\text{Moles of }OH^-=\frac{\text{Mass of }OH^-}{\text{Molar mass of }OH^-}[/tex]

Molar mass of [tex]OH^-[/tex] = 17 g/mole

[tex]\text{Moles of }OH^-=\frac{17g}{17g/mol}=1mole[/tex]

Thus, the number of moles of [tex]OH^-[/tex] is, 1 mole

1. The number of atoms in 7 g of Li is 6.02×10²³ atoms

2. The number of atoms in 24 g of carbon is 1.204×10²⁴ atoms

3. The number of mole in 19 g of fluorine is 1 mole

4. The number of mole in 22 g of carbon dioxide is 0.5 mole

5. The number of mole in 17 g of Hydroxide ion is 1 mole

From Avogadro's hypothesis,

1 mole of Li = 6.02×10²³ atoms

But,

1 mole of Li = 7 g

Thus,

7 g of Li = 6.02×10²³ atoms

From Avogadro's hypothesis,

1 mole of C = 6.02×10²³ atoms

But,

1 mole of C = 12 g

Thus, we can say that

12 g of C = 6.02×10²³ atoms

Therefore,

24 g of C = (24 × 6.02×10²³) / 12

24 g of C = 1.204×10²⁴ atoms

Mole = mass / molar mass

Mole of fluorine = 19 / 19

Mole of fluorine = 1 mole

Mole = mass / molar mass

Mole of CO₂ = 22 / 44

Mole of CO₂ = 0.5 mole

Mole = mass / molar mass

Mole of OH¯ = 17 / 17

Mole of OH¯ = 1 mole

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Answer:

The Earth spins on its axis, but it also precesses about that same axis - it wobbles - and the Earth’s temperature is affected. A Desert makes a terrible heat; look at Arabia - it was once COVERED IN LUSH greenery - that is where The oil came from, millions of years of pressure on all that detritus. Britain was once very famous (2000 years ago) for all its wines - not so much now, huh?

Explanation:

Final answer:

The sun's energy affects Earth's climate through its intensity and distribution due to natural cycles and Earth's orbital dynamics, contributing to weather patterns and temperature variations.

Explanation:

Claims, Evidence, and Reasoning on Sun's Energy and Climate:

Here's a claim about how the sun's energy affects the climate of an area: The intensity and distribution of solar energy directly influence Earth's climate, leading to variations in temperature and weather patterns across the globe. The evidence supporting this claim includes the observation of the sun's natural 11-year cycle, which brings about small changes in the energy output that can affect climate patterns minimally. Additionally, scientific data shows that changes in Earth's orbit, tilt, and axial position can significantly alter the distribution of sunlight, leading to seasonal climate changes and potentially contributing to longer-term climate variations.

The reasoning behind this claim lies in the understanding of the greenhouse effect and how it modulates global temperatures. Gases in Earth's atmosphere trap heat from the sun, which can be intensified by stronger solar intensity resulting in global warming or reduced with weaker solar intensity leading to global cooling. The interactions among Earth's climate system components also regulate the overall climate, with the sun being the primary source of energy driving these interactions.

Subsoil is the layer of soil under the topsoil on the surface of the ground.

Answer:

Subsoil is the layer of soil under the topsoil

Explanation:

Answer:

Hello, Your answer will be B,C,E, And F.

Explanation:

An element is a substance whose atoms have same number of protons which means all atoms in an element have same atomic number. Elements are simplest substances which cannot be broken down by physical changes or chemical reactions. Elements are classified by their names and symbols. Hope That Helps!

Answer:

your answer would be A,B and E

Explanation:

i got it right on edge

This statement is TRUE.

Explanation:

Due to the high heat capacity of water, it takes much more energy to have a gram of water raised by one degree compared to one gram of land. This is why during a hot day, the ground gets hotter faster than the adjacent oceans or adjacent lakes. It also takes water to lose the same amount of energy to have its temperatures drop by one degree as compared to land. During the night, therefore, this is why adjacent water bodies remain relatively warmer than land.

Answer: 1. P1V1 = P2V2

2. P stands for pressure

3. Units for Pressure are atm and Pa

4. V stands for volume

5. Units for volume is in mL

Explanation: Boyle's Law is a gas law that states the relationship between pressure and volume of a gas.

1. P₁V₁ = P₂V₂

2. P stands for pressure

3. Units for Pressure are atm and Pa

4. V stands for volume

5. Units for volume in mL

The volume of a gas at constant temperature varies inversely with the pressure exerted on it. It is given by:

P₁V₁ = P₂V₂

Where,

P is the pressure and

V is the Voulme

The units can be given in volume is measured in litres; pressure in atmospheres; and temperature in degrees Kelvin.

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Answer:

The  Final Temperature of water = 54.48°C.

Explanation:

Given,

Volume of water = 202 mL.

Initial Temperature T₁ = 32°C

Heat energy absorbed = 19 kJ = 19000 Joules

Final Temperature T₂ = ?

Final temperature can be calculated using the formula,

Q = (mass) (ΔT) (Cp)

Here  ΔT = T₂ - T₁

Cp = specific heat of water = 4.184 J/g°C.

For finding the mass, we use the formula,

Density = Mass/Volume

Since, Density of water =  1 g/mL.

Mass of water = 202 grams.

Now Substituting all values in the formula Q = (mass) (ΔT) (Cp)

19000 = (202)(T₂ - T₁)(4.184)

Solving, we get,

(T₂ - T₁) = 22.48°C

Therefore,  T₂ = 22.48°C + 32°C = 54.48°C.

Therefore, Final Temperature of water = 54.48°C.

Felsic magma, with its high silica content and high gas levels, leads to the most explosive volcanic eruptions due to the build-up of pressure and difficulty for gases to escape.

The type of magma that would produce the most explosive volcanic eruption is felsic magma. This kind of magma has high viscosity due to a higher silica content of around 70% SiO2 and contains a large amount of gas, making it quite thick. These characteristics prevent gases from escaping easily, resulting in a build-up of pressure within the magma chamber. When the pressure becomes too great, the magma breaks through the surface in a catastrophic explosion, sending rock, ash, and pyroclastic debris into the atmosphere. The explosiveness of felsic eruptions can be enhanced if there is rapid melting of ice or snow on a volcano, which can lead to devastating mudflows known as lahars.

Answer:

Match each image with the correct state of matter.

A: Gas

B: solid

C: liquid

Explanation:

hope this helps

Answer:

Mass, M is 440.883g

Explanation:

Given the following;

Moles=4.5moles

Molar mass of H3PO4=

Atomic mass of Hydrogen H=(1*3)=3

Atomic mass of Phosphorus P=30.974

Atomic mass of Oxygen O=(16*4)=64

Therefore, Molar mass is;

H3PO4=3+30.974+64=97.974g/mol

[tex]{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]

Mass M = Number of moles × Molar mass

M = 4.5 × 97.974

M = 440.883g

The volume of neon when the pressure is reduced to 93.3 kPa is 519 mL.

Explanation:

The kinetic theory of gases is mostly based on Boyle's law. From the Boyle's law, the pressure experienced by any gas molecules is inversely proportional to volume of the gas molecules. Also this inverse relation is obeyed if and only if the number of moles and temperature of the gas molecules remained constant.

So,[tex]P=\frac{1}{V}[/tex]

So if there is a change in pressure then there will be inverse change in volume. That means if there is decrease in the pressure of gas molecules then there will be increase in the volume and vice versa.

So the Boyle's law is combined as [tex]P_{1} V_{1} = P_{2} V_{2}[/tex]

As here the initial pressure or [tex]P_{1}[/tex] is 1 atm or 101.3 kPa and the initial volume is 478 mL. Similarly, the final pressure is 93.3 kPa and the final volume will be

[tex]101.3*10^{3}*478*10^{-3} = 93.3*10^{3} * V_{2}[/tex]

[tex]V_{2} = 519 mL[/tex]

So, the volume of neon when the pressure is reduced to 93.3 kPa is 519 mL.

Answer:

Explanation:

Use a upper case to identify the dominant allele and lower case to identify recessive allele.

A homozygous pea plant would be YY or gg. The homozygous recessive pea pleant would be gg (YY is dominant).

A heterozygous pea plant would be Yg (or gY which is the same).

The Punnett Square for the cross between a homozygous recessive pea plant (gg) and a heterozygous pea plant (Yg) would be:

                 g        g

       Y      Yg      Yg

       g      gg      gg

Hence, the offspring will have two Yg, which would be yellow pods, and two gg which would be green pods.

That is, 50% of the offspring will have yellow pods and 50% will have green pods.

Answer:3

Explanation:

Answer:

a

Explanation:

The difference between asexual and sexual is one letter "a". this is becuase if you subtract the first letter a off of asexual then you get sexual.

Answer:

1. dividing the mass of water lost by the mass of hydrate used is equal to the fraction of water in the compound. Multiplying this fraction by 100 gives the percent water in the hydrate.

2. hydrate or compounds that incorporate water molecules into the fundamental solid structure in a hydrate which usually has a Pacific crystalline form a Define number of water molecules are associated with each formula unit on the primary material Gypsum is a hydrate with two water molecules present for each formula unit of caso4 the chemical formula for Gypsum is caso4 . H2O

Answer:

45.4% and 54.6%

Answer:

Percentage of water = 2%

Percentage of water = 21%

Percentage of water = 77%

Explanation:

Given data:

Number of molecules of glucose = 20

Number of molecules of hemoglobin = 210

Number of molecules of water = 770

Solution:

To calculate the percentage 1st of all we will determine the total number of molecules.

Total number of molecules = Number of molecules of water + hemoglobin + glucose

Total number of molecules = 770 + 210 + 20

Total number of molecules = 1000

Percentage of water:

Percentage of water = 770/1000 ×100

Percentage of water = 0.77 ×100

Percentage of water = 77%

Percentage of hemoglobin:

Percentage of water = 210/1000 ×100

Percentage of water = 0.21 ×100

Percentage of water = 21%

Percentage of hemoglobin:

Percentage of water = 20/1000 ×100

Percentage of water = 0.02 ×100

Percentage of water = 2%