6. {THROWBACK!!) A sample of CO2 gas has a volume of 145 Lat STP. How many grams of CO2 are in this sample?

Large crystals are formed when igneous rocks cool very slowly.

Answer:

igneous rocks cool very slowly

Explanation:

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The balanced reaction is 3 Ca ( s ) + N 2 ( g )  →  Ca 3 N 2 ( s ).

Explanation:

A chemical equation is said to be balanced when the total number of atoms present on the reactants side is equal to the total number of atoms present on the product side.

The unbalanced chemical equation is as follows,

                             Ca ( s ) + N 2 ( g )  →  Ca 3 N 2 ( s )

To balance this equation, you need to look at how many atoms of each element are present on each side of the chemical equation.

 Calcium has  1  atom on the reactant and  3  on the products side. To balance the reaction we need to multiply the calcium atom by  3  on the reactants side.

                            3 Ca ( s ) + N 2 ( g )  →  Ca 3 N 2 ( s )    

Now  Nitrogen has a coefficient of  2  on both sides of the reaction. Hence the balanced chemical equation will thus be

                              3 Ca ( s ) + N 2 ( g )  →  Ca 3 N 2 ( s )

Answer:

A substance that produces hydrogen ions in solution is AN ACID.

Explanation:

Explanation:

Energy

It is ability to do work .

There are so many forms of energy .

out of which mechanical energy is also one of the form .

Mechanical energy

It is the energy possessed by the body by virtue of its motion and state .

It is of two types :

Kinetic energy

It is the energy possessed by the body by virtue of its motion .

Its expression is :

K.E=1/2mv²

Here in above question it is given that :

mass = 2Kg

V=10m/sec

K.E will be = 1/2 x 2 x 10 x 10

K.E=100 J

Answer:

The electrochemical series is an arrangement of metals in such order that any metal in the list is displaced from its compounds by any metal above it, but displaces any metal below it. The higher up the list a metal is, the greater its activity. Knowing a metal’s placement on this chart can help you understand the activity of the metal, especially in regard to its ability to displace hydrogen in acids. Any items on the list far above hydrogen will do a good job at displacing it, those near it won’t do such a good job, and those below it won’t displace it from acids at all.

Explanation:

I got this answer straight from Penn foster.

Electrochemical series has been the arrangement of metals based on reactivity. It has been important in understanding the reactivity of metals.

Electrochemical series has been the arrangement of the metals in the order of decreasing order of the reactivity. The arrangement has been mediated in the metals arranged above are more reactive and able to displace the lower metals in the series.

The electrochemical series has been important for understanding metals as for the reaction, the compound formed and most reactive compound has been determined easily.

Thus, electrochemical series has been the arrangement of metals based on reactivity. It has been important in understanding the reactivity of metals.

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Answer:

takes in carbon dioxide, puts out oxygen.

Explanation:

The true characteristics of respiration are that it produces ATP, occurs constantly, and responds to temperature changes. Respiration does not happen in chloroplasts, depend on light, or involve taking in carbon dioxide and releasing oxygen.

The true characteristics of respiration include: produces ATP, occurs around the clock, and responds to changes in temperature. Respiration is a biochemical process where cells break down glucose and other molecules to produce ATP (adenosine triphosphate), which provides energy for various cell processes. It happens continuously, regardless of whether it's day or night, hence it 'occurs around the clock'. Although it doesn't directly depend on external temperature, respiration rates can vary with temperature changes because enzymes involved in this process are sensitive to temperature.

However, it is not true that respiration 'takes place in the chloroplasts' or that it 'is dependent on light'. These characteristics are related to photosynthesis, not respiration. Additionally, respiration 'takes in oxygen and puts out carbon dioxide', not the other way round.

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Answer:

Element:

Zinc case

Carbon rod

Compound:

Bitumen

ammonium chloride

Mixture:

Brass cap

carbon and manganese oxide

Explanation:

Elements are considered as pure substances that are made up of only one atom. A zinc case is made up of the metal zinc, which has a negative electrical polarity, that works as the anode in a battery.  The carbon rod is also a component you can find in a battery that serves as the cathode.

Compounds are pure substances as well that are made up of two or more atoms chemically bonded. They cannot be separated through physical means. Examples would be bitumen (pitch) which is a hydrocarbon. Ammonium chloride, is an inorganic compound. It is a salt that can be used as a diuretic.

Mixtures are made up of two or more substances or solutions. They are not chemically bonded, so that means that there are physical ways to separate them. A brass cap is a mixture of different metals, specifically zinc and copper.

Carbon and manganese is a powdered mixture that can be found inside a battery or a dry cell as well. When the battery is powered up, this mixture is then converted into a compound called manganese dioxide.

NaHCO₃ + HCl → NaCl + H₂O + CO₂

Explanation:

NaHCO₃ + HCl → NaCl + H₂O + CO₂

When Sodium bi carbonate (NaHCO₃) reacts with hydrochloric acid (HCl), it forms table salt (NaCl), water ( H₂O ) and Carbon di oxide (CO₂) gas is evolved.

Here base reacts with acid to form salt and it is the neutralization reaction.

Q.No. 1:

            You have 20.0 g of CaCO₃. You decompose it by heat, and weigh the calcium oxide that  remains. You have 10.3 grams. What is the % yield?

Answer:

               %age Yield = 92.37 %

Solution:

               The balance chemical equation for given decomposition reaction is;

                                           CaCO₃ → CaO + CO₂

Step 1: Calculate Moles of CaCO₃:

                Moles  =  Mass / M.Mass

                Moles  =  20.0 g / 100.08 g/mol

                Moles  =  0.199 moles of CaCO₃

Step 2: Calculate theoretical amount of CaO produced;

According to equation,

              1 moles of CaCO₃ produced  =  1 mole of CaO

So,

           0.199 moles of CaCO₃ will produce  =  X moles of CaO

Solving for X,

                     X  =  0.199 mol × 1 mol / 1 mol

                     X  =  0.199 mol of CaO

Also,

         Mass  =  Moles × M.Mass

         Mass  =  0.199 mol × 56.07 g/mol

         Mass  =  11.15 g of CaO

Step 3: Calculate %age Yield as;

         %age Yield  =  Actual Yield / Theoretical Yield × 100

         %age Yield  =  10.3 g / 11.15 g × 100

         %age Yield = 92.37 %

___________________________________________

Q.No. 2:

            A student makes sodium chloride by buming 2.3 grams of sodium in chlorine  gas. If the yield is 90%, how much sodium chloride is made?

Answer:

               Actual Yield =  5.785 g of NaCl

Solution:

               The balance chemical equation for given decomposition reaction is;

                                           2 Na + Cl₂ → 2 NaCl

Step 1: Calculate Moles of Na:

                Moles  =  Mass / M.Mass

                Moles  =  2.3 g / 23 g/mol

                Moles  =  0.10 moles of Na

Step 2: Calculate theoretical amount of NaCl produced;

According to equation,

              2 moles of Na produced  =  2 moles of NaCl

So,

           0.10 moles of Na will produce  =  X moles of NaCl

Solving for X,

                     X  =  0.10 mol × 2 mol / 2 mol

                     X  =  0.10 mol of NaCl

Also,

         Mass  =  Moles × M.Mass

         Mass  =  0.10 mol × 58.44 g/mol

         Mass  =  5.844 g of NaCl

Step 3: Calculate Actual Yield as;

         %age Yield  =  Actual Yield / Theoretical Yield × 100

Or,

         Actual Yield  =  %age Yield × Theoretical Yield ÷ 100

         Actual Yield  =  99 × 5.844 g ÷ 100

         Actual Yield =  5.785 g of NaCl

___________________________________________

Q.No. 3:

            For the chemical reaction Mg(s) + 2 HCl (aq) → H₂ (g) + MgCl₂ (aq) calculate the  % yield if 100 grams of magnesium react with excess HCl to produce 310 grams of MgCl₂.

Answer:

               %age Yield = 79.13 %

Solution:

               The balance chemical equation for given decomposition reaction is;

                                           Mg + 2 HCl → MgCl₂ + H₂

Step 1: Calculate Moles of Mg:

                Moles  =  Mass / M.Mass

                Moles  =  100 g / 24.30 g/mol

                Moles  =  4.11 moles of Mg

Step 2: Calculate theoretical amount of MgCl₂ produced;

According to equation,

              1 mole of Mg produced  =  1 mole of MgCl₂

So,

           4.11 moles of Mg will produce  =  X moles of MgCl₂

Solving for X,

                     X  =  4.11 mol × 1 mol / 1 mol

                     X  =  4.11 mol of MgCl₂

Also,

         Mass  =  Moles × M.Mass

         Mass  =  4.11 mol × 95.21 g/mol

         Mass  =  391.73 g of MgCl₂

Step 3: Calculate %age Yield as;

         %age Yield  =  Actual Yield / Theoretical Yield × 100

         %age Yield  =  310.0 g / 391.73 g × 100

         %age Yield = 79.13 %

Answer:

A

Explanation:

Answer:

Evaporation

Explanation:

I just took the quiz

Explanation:

In the given figure we need to find the total resistance and total voltage .

We know that :

So, in this circuit : R1=12 ohm

R2=8 ohm

R3=10 ohm

Ammeter reading = 10A

so, they are in series therefore ,

Total R = R1 + R2 +R3

R=12 +10+8=30 ohm

To find voltage we have : V=IR

                                          V =10 x 30=300Volts

Answer:

The total resistance in this circuit is 30 ohms.

The battery voltmeter should read 300 volts.

Explanation:

I got it right. hope this helps !! :DD

Answer:When frozen, water molecules take a more defined shape and arrange themselves in six-sided crystalline structures. The crystalline arrangement is less dense than that of the molecules in liquid form which makes the ice less dense than the liquid water. When water freezes, the volume expands by approximately 9%.

Explanation:

Temperature decreases, molecular motion decreases, volume decreases, and shape becomes more defined  Temperature decreases, molecular motion increases, volume decreases, and shape becomes less defined Temperature increases, molecular motion decreases, volume decreases, and shape becomes less defined Temperature decreases, molecular motion increases, volume increases, and shape becomes more defined

Answer:

Explanation:

Final answer:

When water vapor condenses into liquid water, A) Temperature decreases, molecular motion decreases, volume decreases, and shape becomes more defined compared to the gas.

Explanation:

The correct statement to describe when a sample of water vapor condenses into liquid water is A) Temperature decreases, molecular motion decreases, volume decreases, and shape becomes more defined. When water vapor cools down, the molecules lose kinetic energy and move less vigorously, which allows them to come closer together and form liquid water, a process known as condensation. This is also associated with a decrease in volume since the molecules are now more closely packed than they were in the gaseous state. Additionally, the shape becomes more defined because liquids have a definite volume but no definite shape, conforming to the shape of their container, unlike gases that fill the entire space available to them.

Answer:

Bleach and seawater are identified wrong.

Explanation:

Acids have an pH that is lower than 7 and bases have a pH of higher than 7 and (pH 7 is neutral)

We can observe from the table that bleach has a pH of 13 which is higher than 7 and shows basic characteristics

As for seawater the table shows it has a pH of 8 which is also a base. Therefore the answer is 3rd option "Bleach and seawater should be identified as bases".

Answer:

when humans burn fuel or cut down trees , the increase level of carbon dioxide in the atmosphere

Answer:

The valency is 1.

Explanation:

Answer: Al20

Explanation:

Al2O3, or aluminum oxide, has a higher percentage of aluminum content (~52.9%) than Al(NO3)3, aluminum nitrate (~12.7%). This is due to Al2O3 containing two aluminum atoms in its formula, whereas Al(NO3)3 contains only one.

To determine which compound has a higher percentage of aluminum, we need to compare the aluminum content in Al2O3 and Al(NO3)3.

In Al2O3, also known as aluminum oxide, there are two aluminum atoms and three oxygen atoms. The molar mass of Al2O3 can be calculated by adding the atomic masses of 2 aluminum atoms (2x27 g/mol) and 3 oxygen atoms (3x16 g/mol), which amounts to 102 g/mol. The mass of aluminum in the compound is 54 g/mol (2x27 g/mol), resulting in an approximate aluminum content of 52.9% by mass for Al2O3.

For Al(NO3)3, aluminum nitrate, it contains one aluminum atom and three nitrate groups. The molar mass of Al(NO3)3 is comprised of the mass of one aluminum atom (27 g/mol) plus the mass of three nitrate ions (3x(14+3x16) g/mol), which sums up to 213 g/mol. Here, the aluminum's mass percentage is about 12.7%.

Comparing these percentages, Al2O3 has a higher percentage of aluminum than Al(NO3)3.

Answer: 5,242 J

Explanation:

Step by step:

The formula for this is Q=mcΔT

Find out your values and then plug-and-play.

Q= unknown (energy amt we need to find out)

m= 167g

c= 2.093 J/go°C

ΔT= -20.0° + 15° would give you  -5.0°

Plug into the equation for Q=(167g)(2.093 J/g°C)(15°C).

Solve and you get 5,242 J.

hope this helps!!

The heat required to change the temperature of 167 g of ice from -20.0 °C to -5.0 °C is approximately 5246.2 Joules.

To find the amount of heat required to change the temperature of an object, we use the formula:
q = mcΔT
where:
- q is the heat energy (in joules),
- m is the mass of the substance (in grams),
- c is the specific heat capacity of the substance (in J/g°C), and
- ΔT is the change in temperature (in °C).

Here, the mass of the ice (m) is 167 g, the specific heat capacity of ice (c) is 2.093 J/g°C, and the change in temperature (ΔT) is -5.0°C - (-20.0°C) = 15.0°C.

Substitute the values into the formula:
q = (167 g)(2.093 J/g°C)(15.0°C) = 5246.205 J
Therefore, the heat required is about 5246.2 Joules.

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Answer:

Crossing over, or recombination, is the exchange of chromosome segments between nonsister chromatids in meiosis. Crossing over creates new combinations of genes in the gametes that are not found in either parent, contributing to genetic diversity.

Explanation:

What is Crossing over?

How can crossing over lead to the expression of new traits?

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Answer: Ba(CN)2 + (NH4)2SO4 => BaSO4 + 2 NH4CN

Explanation: The reaction will produce BaSO4 Barium sulfate and NH4CN Ammonium cyanide.

Answer:

                       41.51 g of CO

Explanation:

                      The balance chemical equation for given double displacement reaction is,

                                     Fe₂O₃ + 3 CO → 2 Fe + 3 CO₂

Step 1: Calculate moles of Fe₂O₃:

Moles = Mass / M.Mass

Moles = 78.9 g / 159.68 g/mol

Moles = 0.494 moles

Step 2: Calculate moles of CO:

According to equation,

                   1 mole of Fe₂O₃ reacted with  =  3 moles of CO

so,

                 0.494 moles of Fe₂O₃ will react with  =  X moles of CO

Solving for X,

                      X  =  0.494 mol × 3 mol ÷ 1 mol

                      X =  1.482 moles of CO

Step 3: Calculate Mass of CO as:

Mass = Moles × M.Mass

Mass = 1.482 mol × 28.01 g/mol

Mass = 41.51 g of CO

Answer:

                      0.2934 g of N₂

Explanation:

                    The balance chemical equation for given reaction is as follow;

                              2 NH₃ + 3 CuO → 3 Cu + N₂ + 3 H₂O

Step 1: Calculate Moles of CuO as;

                Moles  =  Mass / M.Mass

                Moles  =  2.5 g / 79.54 g/mol

                Moles  =  0.0314 moles of CuO

Step 2: Find out moles of N₂ as;

According to equation,

                      3 moles of CuO produced  =  1 mole of N₂

So,

                0.0314 moles of CuO will produce  = X moles of N₂

Solving for X,

                       X =  0.0314 mol × 1 mol / 3 mol

                      X =  0.0104 moles of N₂

Step 3: Calculate Mass of N₂ as;

                    Mass  =  Moles × M.Mass

                    Mass  =  0.0104 mol × 28.01 g/mol

                    Mass  = 0.2934 g of N₂

Answer:

1 is the the earth and 2 is all of the above

Explanation:

Answer:

The answer is for 1. Earth.   2. Burrows

These imprints give scientists clues as to how these animals lived.

Explanation:

Answer:

(a bit of heat) and light

Explanation:

it has the resistance in it so it will give heat when surpassed by a high tension

Answer:

35 percent

Explanation:

Answer:92%

Explanation:

Answer:

it could be a B. egg cell or C. A stem cell but im pretty sure the answer is egg cell

hopes it helps!

The cell which is formed by the process of Meiosis is called as an egg cell. The correct option is B.

Meiosis is a type of cell division that produces four daughter cells, each with half the number of chromosomes as the original cell. This process is essential for sexual reproduction, where haploid gametes, such as egg and sperm cells, are produced. Meiosis is called as reductional division type of cell division.

Through the process of Meiosis, four daughter cells are formed which are not exactly same or identical to the parent cell.

Bacterial cells do not undergo meiosis as they reproduce asexually through binary fission. Stem cells and brain cells are also not formed by meiosis but by mitosis, a type of cell division that produces identical daughter cells with the same number of chromosomes as the original cell.

Therefore, the correct option is B.

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The flow of ocean currents is most directly affected by winds, with the Coriolis Effect also playing a significant role. Other factors like seawater density, affected by temperature and salinity, as well as geographical features and the conservation of potential vorticity, also influence current patterns.

The factor that most directly affects the flow of ocean currents is the wind. Surface ocean currents are primarily driven by prevailing winds, which are influenced by global weather patterns and the Earth's rotation, an effect known as the Coriolis Effect. These currents are responsible for transporting heat from tropical regions towards higher latitudes and affect regional weather cycles.

Moreover, the density of seawater, determined by temperature and salinity, influences the movement of deep ocean currents, known as thermohaline circulation. Changes in the water's density, such as from melting ice caps and warming surface waters, can disrupt this circulation and impact climate and weather patterns globally, which is part of the larger Global Conveyor Belt system.

Another aspect is the geographical configuration of coastlines and the seafloor, which can lead to the creation of unique patterns such as gyres and eddies. These physical features can redirect the flow of currents and lead to the convergence or divergence of water masses.

Moreover, the vorticity of water, which is a measure of the local rotation at a certain point in the fluid, can influence ocean currents through mechanisms like the conservation of potential vorticity and the interplay with underwater landscapes.

Overall, while winds are the primary driver of surface currents, the interplay of multiple factors such as the Earth's rotation, temperature, salinity, geological features, and vorticity all contribute to the complex flow patterns of ocean currents.

The correct answer is B differences in temperature is the factor that MOST directly affects the flow of ocean currents.

The temperature variations are the most fundamental factor that sets the ocean in motion, creating density differences and driving the circulation patterns that we see as ocean currents.

The other option is incorrect:

Option A is wrong because Differences in pressure: While pressure differences can influence currents, they are often a result of temperature variations.

Option C is wrong because  Earth's revolution round the Sun: Earth's revolution does have some influence on tides and ocean movements, but its effect on overall current flow is less direct.

Option D is wrong because The Moon's revolution round Earth: the Moon's gravity plays a major role in tides, but its influence on overall current flow is less significant compared to temperature variations.

The complete question is

Which factor MOST directly affects the flow of ocean currents?

A) differences in pressure

B) differences in temperature

C) Earth's revolution round the Sun

D) The Moon's revolution round Earth

Answer:

The volumes of 1 mol of CO2 and 1 mol of N2, gases are the same.

Explanation:

1 mole of a gas occupy 22.4L at stp. This is true for all gases. So,

1mol of CO2 = 22.4L

1mole of N2 = 22.4L

From the above illustration, 1mole of CO2 and 1mole N2 have the same volume at stp

Answer: The volumes of 1 mol of CO2 and 1 mol of N, gases are the same.

Explanation:

Answer:

6.25 hours

Explanation:

From the question;

We need to determine the time it will take for her to knit 300 rows

4 rows = 5 minutes

300 rows = ?

= (300 × 5 ) ÷ 4

= 375 minutes

But, 1 hour = 60 minutes

Therefore;

= 375 ÷ 60

= 6.25 hours

Thus, it will take penny 6.25 hours to knit 300 rows

It will take her 6.25 hours to knit 300 rows.

Given:

Penny can knit 4 rows in 5 minutes

4 rows = 5 minutes

To find:

Time for knitting 300 rows=?

Time = (300 × 5 ) ÷ 4

Time = 375 minutes

As we know, 1 hour = 60 minutes

Thus,

Time= 375 ÷ 60

Time= 6.25 hours

So, it will take 6.25 hours to knit 300 rows.

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