How many electrons does carbon have?

Answer:

Sodium Sulphide.

Explanation:

The chemical name is sodium sulphide. The valency of the sulphide ion is 2 while the valency of sodium is 1 . That is why the molecule contains 2 sodium ions.

Answer: sodium sulphide.

Explanation:

[tex]Na_2S[/tex] is an ionic compound because sodium element is a metal and sulphur element is a non-metal. The bond formed between a metal and a non-metal is always ionic in nature.

The nomenclature of ionic compounds is given by:

1. Positive is written first.

2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.

Hence, the name of [tex]Na_2S[/tex] is sodium sulphide.

Therefore, the correct answer is sodium sulphide.

Answer: The number of tablets that can be made for the given mass of aspirin is 14938

Explanation:

We are given:

Total mass of aspirin = 1.21 kg = 1210000 mg    (Conversion factor: 1 kg = 1000000 mg)

Mass of aspirin in 1 tablet = 81 mg

To calculate the number of tablets, we divide the total mass of aspirin to the mass of aspirin in 1 tablet, we get:

[tex]\text{Number of tablets}=\frac{\text{Total mass of aspirin}}{\text{Mass of aspirin in 1 tablet}}[/tex]

[tex]\text{Number of tablets}=\frac{1210000mg}{81mg}=14938.3\approx 14938[/tex]

Hence, the number of tablets that can be made for the given mass of aspirin is 14938

14938 low dose aspirin tablets can be made from 1.21kg aspirin.

CONVERSION FACTOR:

Conversion factor: 1 kg = 1000000 mg

Hence, 1.21kg = 1.21 × 1000000

= 1210000 mg

= 1210000 ÷ 81

= 14938.27

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Answer:

creating a hypothesis.

Explanation:

you need to have a hypothesis to then start designing the exp.

Answer:

its c)creating a hypothesis.

Explanation:

just took quiz

In the nuclear fusion reaction energy is produced due to remaining mass of the nuclei and in nuclear fission it is released due to breaking of bonds of the nucleus.

Nuclear reactions are those reactions in which nuclei of two atoms are involved in the reaction.

These are of two types:

Hence, energy is produces by the change in mass and breaking of bonds in the nuclear reactions.

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Iodine's chemical properties include solubility in various solvents to form violet or brown solutions, and its ability to act as a weak Lewis acid towards iodide ions. It is also the least reactive halogen and does not oxidize other halide ions.

Iodine exhibits several chemical properties. It is soluble in chloroform, carbon tetrachloride, carbon disulfide, and many hydrocarbons, forming violet solutions. It dissolves slightly in water, giving brown solutions. Iodine is also soluble in aqueous solutions of iodides, where it forms brown solutions due to its ability to act as a weak Lewis acid towards the iodide ion. In addition, iodine is the least reactive halogen and does not oxidize other halide ions.

Answer:

V = 48.7 L

Explanation:

We can calculate the volume V, by using the ideal gas law:

P V = n R T

Where we have:  

P is the pressure, V is the volume, and T is the temperature T, R is the gas constant, and n is the number of moles of the gas.  

According to the international unit systems R is 8.314 J / K. mol.  

With this value the P unit will be Pa and the V unit will be m³.  

Then,  

V = (n R T)/ P  

V = [(36/18) × 8.314 × 293] / (100 * 1000)  

V = 0.0487 m³  

And the volume by litter unit is:  

V = 48.7 L

Answer:

The rate of forward reaction increases.

Explanation:

Increasing the volume of oxygen:

will increase the concentration of oxygen (reactants), so the equilibrium will be shifted to the right side (products side) to suppress the effect of increasing the volume of oxygen.

So, the right choice is: The rate of forward reaction increases.

Answer:

Cellular respiration creates an energy molecule when glucose is broken down. B.

Answer:

Deforestation, increase wildlife extinction, ecosystem imbalances, soil erosion, migration and loss of species.

Explanation:

Global warming is warming the earth's surface temperature, which causes the changes in our ecosystem like deforestation, soil erosion, climate changes, migration and loss of species etc.

Global warming is caused by the 'Greenhouse effect', major gases are carbon dioxide(9-26%), methane(4-9%), water vapour(36-70%) ozone(3-7%) and nitrous oxide.    

Global warming affects on the ocean include rising sea level, meiting glaciers, thermal expansion and ice sheets. It also cause the bird migration which carries high cost of predation and mortality.

Answer:

D. altered ecosystems

Explanation:

Deforestation, increase wildlife extinction, ecosystem imbalances, soil erosion, migration and loss of species are all effects of global warming. These are under the umbrella of consequences from global warming.

Answer:

First one is 5.0 M ammonia and the Second one ?

Explanation:

Lydia and Damian will select bases with low kb that are present in highly concentrated solutions in the storage cabinet.

In a chemical process, bases are compounds that can accept hydrogen ions (H+). They often taste bitter, are slippery to the touch, and have the ability to change the color of litmus paper from red to blue. Typical examples of bases are sodium hydroxide (NaOH), ammonia (NH3), and baking soda (sodium bicarbonate, NaHCO3). Acids, which cause a chemical reaction to release hydrogen ions (H+), are the opposite of bases.

The ability of a base to accept hydrogen ions determines the strength of the base. While weak bases, such as ammonia, have a low affinity for hydrogen ions and can only partially dissociate in water, strong bases, such as sodium hydroxide, have a high affinity for hydrogen ions and can dissociate completely in water. Alkalis play an important role in many chemical processes.

Therefore, Lydia and Damian will select bases with low kb that are present in highly concentrated solutions in the storage cabinet.

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Answer:

It completely dissociates in water.

Explanation:

The characteristic of a strong acid is that it completely dissociates when dissolved in water to form ions.

Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste. Compounds such as  HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.

According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic  acids  depending on the number of protons which are liberated on dissociation.

Acids are widely used in industries  for  production of fertilizers, detergents  batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.

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For a manual transmission, park in first gear when facing uphill, and in reverse when facing downhill, always using the parking brake and turning the wheels away from the curb when parked uphill.

When parking uphill in a car with a manual transmission, it is generally recommended to park with the transmission in first gear if you are facing uphill and reverse gear if you are facing downhill. This helps to ensure that if your parking brake fails, the engine will help prevent the car from rolling. However, always remember to use the parking brake regardless of the gear used. It is also advisable to turn your wheels away from the curb when parking uphill, so in the event your car begins to roll, it will roll into the curb which can help stop the car.

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Answer:

[tex]\boxed{\text{0.56 g}}[/tex]

Explanation:

The half-life of Na-24 (15 h) is the time it takes for half of it to decay.  

After one half-life, half (50 %) of the original amount will remain.  

After a second half-life, half of that amount (25 %) will remain, and so on.  

We can construct a table as follows:  

  No. of                 Fraction          Mass

half-lives   t/da   Remaining   Remaining/g

      0             0           1                      18

       1            15            ½                    9.0

      2           30            ¼                    4.5

      3           45            ⅛                    2.2

      4           60            ⅟₁₆                   1.1

      5           75            ⅟₃₂                   0.56

      6           90           ⅟₆₄                   0.28

We see that  [tex]\boxed{\textbf{0.56 g}}[/tex] remain after five half-lives (75 h).

The half-life of Sodium-24 is 15 hours. Using this information, you can determine that approximately 0.5625g of the initial 18g of Sodium-24 will remain after 75 hours.

In order to determine the amount of Sodium-24 remaining after 75 hours, we first need to know the half-life of Sodium-24, which is approximately 15 hours. The term 'half-life' refers to the period of time it takes for half of the initial amount of a radioactive substance to decay.

After one half-life (15 hours), half of the 18g of Sodium-24 would remain, which is 9g. After the second half-life (30 hours), half of the 9g would remain, which is 4.5g. After the third half-life (45 hours), half of 4.5g would remain, which is 2.25g. After the fourth half-life (60 hours), half of 2.25g would remain, which is about 1.125g. Finally, after the fifth half-life (75 hours), half of 1.125g would remain, which is approximately 0.5625g. Thus, after 75 hours, 0.5625g of the initial 18g of Sodium-24 would remain.

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Answer:

[tex]\boxed{\text{378 mL}}[/tex]

Explanation:

The temperature and amount of gas are constant, so we can use Boyle’s Law.

[tex]p_{1}V_{1} = p_{2}V_{2}[/tex]

Data:

[tex]\begin{array}{rclrcl}p_{1}& =& \text{172 kPa}\qquad & V_{1} &= & \text{?} \\p_{2}& =& \text{85.0 kPa}\qquad & V_{2} &= & \text{765 mL}\\\end{array}[/tex]

Calculations:

[tex]\begin{array}{rcl}172V_{1} & =& 85.0 \times 765\\172V_{1} & = & 65 025\\V_{1} & = &\textbf{378 mL}\\\end{array}\\\text{The original volume was } \boxed{\textbf{378 mL}}[/tex]

Final answer:

Using Boyle's Law, which states that at a constant temperature the pressure and volume of a gas are inversely related, the original volume of hydrogen in the container can be calculated to be approximately 2211 mL.

Explanation:

To find the original volume of the hydrogen gas, we apply Boyle's Law, which states that the pressure of a gas multiplied by its volume is constant at constant temperature (P1V1 = P2V2). In the given problem, we have an initial pressure (P1) of 172 kPa, an unknown original volume (V1), a final pressure (P2) of 85.0 kPa, and a final volume (V2) of 765 mL.

Using the formula, we have:

172 kPa × V1 = 85.0 kPa × 765 mL

Now we solve for V1:

V1 = (85.0 kPa × 765 mL) / 172 kPa

V1 = 380.25 kPa·mL / 172 kPa

V1 = 2210.7558 mL

Therefore, the original volume of the hydrogen gas was approximately 2211 mL.

Answer:

Explanation:

Method 1 proportion

1 mole of chromium is 52 grams

11.9 moles = x grams

1/11.9 = 52/x                    Cross multiply

x = 11.9 * 52

x = 618.8                         grams

Now I have used an approximate mass for Chromium. The answer you get here is expected to reflect the weigth given on your periodic table Use that to get your answer. You should give a number very close to mine. Round to 3 places as in 619.

Method Two  Formula

mols = given mass / molecular mass

11.9 = given mass /  51.9961          Multiply both sides by  51.9961

11.9 *51.9961  = given mass            

given mass = 618.75

given mass = 619

Answer:

Boiling point

Explanation:

If the liquids have different boiling points, you can separate them by distillation.

You must carefully control the temperature, so only the liquid with the lower boiling point evaporates, and you can collect it using a condenser.  

The boiling points should differ by at least 40 °C for a simple distillation to give good separation.

Answer:

mixture of sand gravel and crushed stone

Answer:

A natural mixture of sand, gravel, and crushed stone.

Explanation:

An aggregate refers to a composite material commonly used in construction, made up of a collection of particles, including sand, gravel, and crushed stone. These materials are often used in the production of concrete, asphalt, and other building materials to provide structural stability and durability. Aggregates are sourced from natural deposits or quarried from larger rock formations and are essential in the construction industry due to their versatility and availability.

Answer:

02 is a product

Explanation:

it doesnt take part in chemical reaction so its not reactant.02 doesnt alter rate of chemical reaction so it cannot be catalyst. it is gas it is not solid so it is a product.

Answer: D. Product

Explanation:

C) the basic unit of inheritance

The amount of heat needed to vaporize the given amount of water is the product of the amount in grams and the latent heat of vaporization in cal per gram. That is,

                              H = (540 calories / gram)( 500 grams) = 270,000 cal

Thus, the heat needed is 270, 000 calories. The answer is letter C.

Hope this helps :) thats just a sh

Answer:

270,000 cal

Explanation:

In order to calculate the calories needed to completely vaporize 500 grams of water we just have to use the formula of the latent heat of vaporization, we know that it takes 540 calories to vaporize a gram of water, so we just multiply that by the number of grams:

(500 grams of water)(540 calories/gram)= 270,000 calories

It would taje 270,000 calories to vaporize 500 grams of water.

Answer:

Explanation:

Observation leads to drawing of inferences not the other way round. If no observation is made, then there is no basis of making inferences and testing them out.

Observations helps to gather facts and data through which patterns can be deduced and meaningful inferences made out. Observation is made using our five senses. Without first observing and pooling together some data, the basis of a scientific inquiry would falter along the line.

Inferences gives an arching overview to observations made. Inferences are made using prior experiences or knowledge. A times, we can notice some patterns in the data we have gathered and inferences can be made from them.  

It's C that's correct.... (the are both magnetic north and south poles)

Earth is like a bar magnet, there are both magnetic north and south poles. Therefore, option (C) is correct.

A magnet can be defined as an object that has a north pole and south magnetic pole and a magnetic field.  The idea that Earth is a magnet, was first proposed in 1600 by a British physician William Gilbert. He represented the earth as a magnet with help of a spherical magnet.

With a compass, the spherical magnet causes a compass needle to behave in a similar way that Earth causes a compass needle to behave. This indicated that a spherical magnet is a good model to represent that the Earth is a magnet.

Earth has north and south magnetic poles from which the North Pole is located at about 80° north latitude. The magnetic field is strongest at the poles, and magnetic field lines of magnetic force move from the north pole to the south magnetic pole.

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Answer:

2-pentanone

Explanation:

The oxygen atom is attached to the 2nd carbon atom in the longest linear chain, thus the prefix 2. the longest continuous carbon chain has five carbon atoms giving it the prefix pent-. the chemical is a ketone thus the suffix none.

Answer:

CH2.

Explanation:

The mass of C in the CO2 =  2.49 * 12/(12+32) =  0.6791 g

The mass of Hydrogen in the water = 2 * 1.008 / (2.016 + 16) = 0.1119 g.

Ratio of H to O is 0.1119/ 1.008 : 0.6791/12

= 0.111 : 0.0566

= 2 : 1

The empirical formula is CH2

acidic tap water form green layer ofcarbonate on copper surface which prevent it from corrosion but iron when react to water and oxygen form rust

also fe lies above than cu in activity series

The chemical reactivity of copper is less than iron and with the formation of stable copper oxide, copper pipes are less likely to corrode.

The corrosion or  rusting is the chemical phenomenon given by an element that results in the decomposition of the metal into stable oxide.

The copper metal in the presence of oxygen  forms the more stable and unreactive copper oxide that protect the metal from corrosion.

The chemical equation for the formation of copper oxide is:

4 Cu + O₂ → 2 Cu₂O

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Answer: 1 = 1e-5

Explanation: Divide the pressure value by 100000

Answer:

Since this is an ionic compound, you must balance the charges so that overall charge of the compound is neutral. Sodium, an alkali metal, has a tendency to lose one electron. As a result sodium normally carries a positive one charge. Sulfur, a nonmetal, has a tendency to gain 2 electrons.

Explanation:

Answer:

Sodium commonly forms a

+

I

ion.

Explanation:

And thus the chemical formula for sodium sulfide is

Na2S , i.e. two sodium ions are required to form a neutral salt with

S2-

The reaction to form NH3 is : N2 + 3H2-> 2NH3 12,33g NH3 is 12,33/17,03=0,3 =0,724 moles of NH3 moles NH3. So you need 1,5*0,724 = 1,086 moles H2 1,086*2,016 = 2,189 g of H2 is needed ro form 12,33 g NH3

Answer: option B is correct. im gonna turn u into a balloon

Explanation:

The answer is B positively charged hair

Answer:

0.9925 atm.

Explanation:

We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm (P = ??? atm).

V is the volume of the gas in L (V = 42.5 L).

n is the no. of moles of the gas in mol (n = 1.52 mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 65°C + 273 = 338.0 K).

∴ P = nRT/V = (1.52 mol)(0.0821 L.atm/mol.K)(338.0 K)/(42.5 L) = 0.9925 atm.