The half life of Uranium-238 is 4.5 billion years and the age of earth is 4.5 X 109 years. What fraction of Uranium-238 that was present when Earth was formed still remains?

Answer:

Plant A

Explanation:

This is because Plant A is what you will compare to the other plants. Because it has no fertilizer is is the independent variable.

Answer:

All known vaccine molecules must be tested to find the right one.

Explanation:

I took the test

Answer:

Chemical energy to kinetic energy and gravitational potential energy

Explanation:

The kinetic and potential energy is collectively known as the mechanical energy. When you eat a large meal and then hike up a hill the energy change taking place is Chemical energy to kinetic energy and gravitational potential energy. The correct option is A.

The physical quantity which is transferred from one object to another to perform work or to heat the object is defined as the energy. The SI unit of energy is Joule and it is a derived unit.

The energy possessed by a moving body due to its motion is defined as the kinetic energy. The energy stored by an object due to its position is called the potential energy.

When we eat food, our body uses the chemical energy of food and during climbing, the body gets moved so the kinetic energy gets converted into gravitational potential energy.

Thus the correct option is A.

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Answer:

Water pipes sometimes burst during the winter because the cold causes the water to expand when frozen so the pipes cant exactly stretch causing stress on the pipe until it inevitably bursts

Based on the flow rate data provided for the 6 M sulfuric acid solution;

The molar mass of sulfuric acid is obtained from the molar atomic masses of it component elements.

Molar mass of H2SO4 = (2 × 1) + (32 × 1) + (16 × 4)

Molar mass of H2SO4 = (2 = 98 g/mol

Based on the flow rate data provided:

Moles of 6 M sulfuric acid in 100 L = molarity × volume

Moles of 6 M sulfuric acid in 100 L = 6 M × 100 L = 600 moles

molar flow rate = 600 mol/min

Mass of 600 moles sulfuric acid = moles × molar mass

Mass of 600 moles sulfuric acid = 600 × 98 = 58.8 kg

Mass flow rate = 58.8 kg/min

Mass of sulfuric acid in 100 L solution = volume × density

density of sulfuric acid = 1.34 g/cm^3 = 1.34 kg/L

Mass of sulfuric acid in 100 L solution = 1.34 kg/L × 100 L = 134 kg

Therefore, total mass flow rate = 134 kg/min

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Answer:

An atomic element is an element which exists independently as atoms and can still react with other elements forming a compound

Answer:

The relationship between the boxer crab and the anemone is a form of symbiosis, called mutualism.

Explanation:

The boxer crab —Lybia tesselata— receives its name because it carries anemones in its anterior claws, in the form of boxing gloves, constituting a symbiotic association of a mutual type.

Mutualism is an interspecific relationship where two individuals of different species benefit from each other.

The anemone —usually of the genus Triactis or Bunodeopsis— has tentacles capable of secreting a stinging substance that contributes to the defense of the crab against its natural predators. On the other hand, the crab helps the anemone to transport and feeds on the food remains left by the crab.

This problem is providing the masses of both toluene and butan-1-ol and the vapor pressure of the latter when pure. Thus, it asks for the vapor pressure of this alcohol in the mixture, therefore the answer turns out 812 Pa.

In chemistry, when two pure liquids are mixed, their properties as a mixture differ from those when pure, for that reason we use the Raoult's law in order to quantify these properties as pure substances, or when mixed with other substances.

In such a way, one can write this law for butan-1-ol as follows:

[tex]P_{but}=P_{but}^{pure}*x_{but}[/tex]

Where we know its vapor pressure as 885 Pa and we want to calculate its partial pressure but first its molar fraction with the given masses converted to moles as follows:

[tex]x_{but}=\frac{n_{but}}{n_{but}+n_{tol}} \\\\n_{but}=136.2g*\frac{1mol}{74.121g}=1.838mol\\ \\n_{tol}=15.6g*\frac{1mol}{94.14g} =0.166mol\\\\x_{but}=\frac{1.838mol}{1.838mol+0.166mol}=0.927[/tex]

Finally, we solve for its partial pressure:

[tex]P_{but}=885Pa*0.917\\\\P_{but}=812Pa[/tex]

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There don't seem to be any H atoms in that formula. All I see is Hg, which is mercury.

Answer:

800 grams

Explanation:

Density = mass/volume  =>  mass = Density x Volume

Density = 0.80 g/ml

Volume = 1.0 Liter = 1000 ml

mass of 1.0 liter = 0.80 g/ml X 1000 ml = 800 grams

Answer:

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Vitamin A is a fat-soluble vitamin and an essential nutrient for humans. It is a group of organic compounds that includes retinol, retinal (also known as retinaldehyde), retinoic acid, and several provitamin A carotenoids (most notably beta-carotene (β-carotene).

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Answer:

Drier air over land than water

                   OR

A:warmer air over land than water

In the complete combustion of 5.75 L of CH₄ at 710 K, 5.75 L of CO₂ and 11.5 L of H₂O.

Combustion is a high-temperature exothermic redox chemical reaction between a fuel and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.

CH₄(g) + 2 O₂(g) ⇒ CO₂(g) + 2 H₂O(g)

According to the balanced equation, the volume ratio of CH₄ to CO₂ is 1:1.

5.75 L CH₄ × 1 L CO₂/1 L CH₄ = 5.75 L CO₂

According to the balanced equation, the volume ratio of CH₄ to H₂O is 1:2.

5.75 L CH₄ × 2 L H₂O/1 L CH₄ = 11.5 L H₂O

In the complete combustion of 5.75 L of CH₄ at 710 K, 5.75 L of CO₂ and 11.5 L of H₂O.

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The term that identifies the amount of heat needed to raise the temperature of 1 gram of a substance by 1 degree Celsius is Specific heat capacity.

Specific heat capacity is the quantity of heat needed to raise the temperature of 1 gram of a substance by 1 degree Celsius. The unit of specific heat capacity is joule per gram per degree Celsius (J/g⁰C).

Specific heat capacity is heat required to raise the temperature of a unit mass of a substance while heat capacity is the quantity of heat required to raise the temperature an entire mass of a substance.

Heat capacity is measure in Joules (J) while specific heat capacity is measured in joule per gram per degree Celsius (J/g⁰C).

Thus, the term that identifies the amount of heat needed to raise the temperature of 1 gram of a substance by 1 degree Celsius is Specific heat capacity.

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The term that identifies the amount of heat needed to raise the temperature of one gram of a substance by one degree Celsius is : ( A ) Specific heat

Specific heat also known specific heat is the amount of heat that is added to 1 unit ( gram ) of a substance in order to raise its temperature by one ( 1 ) degree Celsius of temperature.

Hence we can conclude that The term that identifies the amount of heat needed to raise the temperature of one gram of a substance by one degree Celsius is Specific heat

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Answer:

sp2 = Bent, trigonal plannar

ap3=Bent, trigonal bipyramidal

Explanation:

right on edge 2021

Answer:

sp2 bent

trigonal planar

sp3 bent

tetrahedral  

Explanation:

Answer:

Galeras has erupted more than 20 times since the 1500s. Volcanic activity has been frequent in the last five years, including an eruption in January 1993 that killed nine people on a scientific expedition to the volcano summit. Chuck Wood of VolcanoWorld was on Galeras at that time but was not injured

Explanation:

Galeras has erupted more than 20 times since 1500s. Volcano activity has been frequent in the last 5 years,including an eruption in January 1993 that killed nine people on a scientific expedition to the volcano summit.

Answer:

Thx

Explanation:

Answer:

A

Explanation:

This group includes beryllium, magnesium, calcium, strontium, barium, and radium. All group 2 elements have two valence electrons

The number of electrons in the atom in its neutral state will be equal to 12. Therefore, option (2) is correct.

A neutral atom can be defined as one in which the number of the positive charge will be equal to the number of the negative charge. Therefore, the overall electrical charge on such an atom is zero and that type of atom is called a neutral atom.

For a neutral atom, commonly say that the number of electrons is equal to the number of protons. All chemical elements present in the modern periodic table are neutral.

Given, the electrical charge of the nucleus of an atom is equal to + 12. It means the given atom has 12 protons. As the number of protons and electrons in the neutral atom is the same, therefore the number of electrons in the given atom is equal to 12.

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Answer: 8

Explanation:

Answer:

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Redox is a type of chemical reaction in which the oxidation states of atoms are changed.

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Answer:

Infrared radiation has longer waves than red light, and thus oscillates at a lower frequency and carries less energy. Ultraviolet radiation has shorter waves than blue or violet light, and thus oscillates more rapidly and carries more energy per photon than visible light does.

Explanation:

1. The limiting reactant in the reaction is NH₃

2. The mass of the excess reactant remaining is 0.49 g

3. The mass of NO produced from the reaction is 3.35 g

4NH₃ + 5O₂ —> 4NO + 6H₂O

Molar mass of NH₃ = 14 + (3×1) = 17 g/mol

Mass of NH₃ from the balanced equation = 4 × 17 = 68 g

Molar mass of O₂ = 16 × 2 = 32 g/mol

Mass of O₂ from the balanced = 5 × 32 = 160 g

Molar mass of NO = 14 + 16 = 30 g/mol

Mass of NO from the balanced equation = 4 × 30 = 120 g

SUMMARY

From the balanced equation above,

68 g of NH₃ reacted with 160 g of O₂ to produce 120 g of NO

From the balanced equation above,

68 g of NH₃ reacted with 160 g of O₂

Therefore,

1.90 g of NH₃ will react with = (1.90 × 160) / 68 = 4.47 g of O₂

From the calculation made above, we can see that only 4.47 g out of 4.96 g of O₂ given is needed to react completely with 1.90 g of NH₃.

Therefore, NH₃ is the limiting reactant.

Mass of excess reactant (O₂) remaining = 4.96 – 4.47

Mass of excess reactant (O₂) remaining = 0.49 g

In this case, the limiting reactant (NH₃) will be used.

From the balanced equation above,

68 g of NH₃ reacted to produce 120 g of NO

Therefore,

1.90 g of NH₃ will react to produce = (1.90 × 120) / 68 = 3.35 g of NO.

Thus, 3.35 g of NO were obtained from the reaction.

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Answer:

Explanation:

Your circulatory system carries oxygen, water, and nutrients to cells throughout your body. Wastes from the cells are eliminated by your respiratory system, your excretory system, and your skin. Your nervous system controls all these activities with electrical impulses.

Answer: ionic bonds, covalent bonds

Explanation:

Got it right on my test.

Metals can forms ionic bond with non-metals by losing electrons from metals to the non-metals. They can also form metal metal bonds when they make metallic complexes and dimers. Thus option 4 is correct.

Ionic bond is the strongest type of bond formed between metals and nonmetal. Metals are electron rich and thus they are electropositive. They can donate electrons to non-metals.

Electronegative non metal atoms gain one or more electrons from the metals and thus forms the ionic compounds. Hence, ionic compounds are formed between atoms of high electronegativity difference.

Non metals like oxygen, nitrogen , halogens etc are highly electronegative and withdraw electrons from metals. Ionic compounds can have polarity if there occurs a charge separation between atoms.

Metals can also form metal-metal bonds with other metals in the case of coordination compounds and organometallic compounds. Hence, option 4 is correct.

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Your question is incomplete. But your complete question probably was:

Metals can be involved in _______ ?

1, Covalent bonding

2.Ionic bonding

3. Metal-metal bond

4. Two of the above.

Answer:

the compound contains C, H, and some other element of unknownidentity, so we can’t calculate the empirical formula

Explanation:

Mass of CO2 obtained = 3.14 g

Hence number of moles of CO2 = 3.14g/44.0 g = 0.0714 mol

The mass of the carbon in the sample = 0.0714 mol × 12.0g/mol = 0.857 g

Mass of H2O obtained = 1.29 g

Hence number of moles of H2O = 1.29g/18.0 g = 0.0717 mol

The mass of the carbon in the sample = 0.0717 mol × 1g/mol = 0.0717 g

% by mass of carbon = 0.857/1 ×100 = 85.7 %

% by mass of hydrogen = 0.0717/1 × 100 = 7.17%

Mass of carbon and hydrogen = 85.7 + 7.17 = 92.87 %

Hence, there must be an unidentified element that accounts for (100 - 92.87) = 7.13% of the compound.

Answer: Particles are moving from regions of high concentration to low concentration.

Explanation:

Diffusion is driven by differences in concentration. When chemical substances such as perfume are let loose in a room, their particles mix with the particles of air. The particles of smelly gas are free to move quickly in all directions. They eventually spread through the whole room from an area of high concentration to an area of low concentration. This continues until the concentration of the particles of smelly gas is the same throughout the room. Remember that the particles still move, even when the smell is evenly spread.

Answer:

Answer: Particles are moving from regions of high concentration to low concentration.

Explanation:

right on edge 2021

Explanation:

|2x-1|=x+1

√(2x-1)²= x+1

(2x+1)²=(x+1)²

4x²-4x+1=x²+2x+1

3x²-6x=0

x²-2x=0

x(x-2)=0

x=0 or x=2