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Answer:

Helium

In the sun, hydrogen is converted to __Helium__ through nuclear fusion.

Answer:

helium

Explanation:

Answer:

Intensive properties can be used to help identify a sample because these characteristics do not depend on the amount of sample, nor do they change according to conditions.

Explanation:

Intensive properties are bulk properties, which means they do not depend on the amount of matter that is present. Examples of intensive properties include:

Boiling Point

Density

State of Matter

Color

Melting Point

Odor

Temperature

Refractive Index

Luster

Hardness

Ductility

Malleability

Explanation:

When amount of matter changes in a substance then a physical property that does not change due to this is known as an intensive property.

For example, density, color, boiling point, hardness etc are all intensive properties.

Whereas  property of a substance that changes due to change in amount of matter of a substance is known as extensive property.

For example, temperature, volume etc are all extensive properties.

Hence, we can conclude that given properties are classifies as follows.

Intensive property : color, hardness, boiling point, density, temperature.

Extensive property : length, volume, mass.

Answer:

C₃H₈₍g₎ + 5O₂₍g₎→  3CO₂₍g₎ + 4H₂O₍l₎

Explanation:

Propane is an alkane that burns in enough oxygen to produce carbon (iv) Oxide and heat as the only by products. Balancing the equation: The number of atoms of each kind on either side should be equal. Hydrogen on the left has eight atoms same as the right side after balancing, oxygen has 10 while carbon has 3 on each side.

Answer:The value of the coefficients are:

[tex]a_o=1,a_1=5,a_2=3,a_3=4[/tex]

Explanation:

Number written in front of the molecule or element in balanced chemical reaction is known as stoichiometric coefficient.

[tex]a_oC_3H_8 +a_1O_2 \rightarrow a_2CO2 +a_3H2O[/tex]

The balance chemical reaction will be given by:

[tex]1C_3H_8 + 5O_2 \rightarrow 3CO2 + 4H2O[/tex]

[tex]a_o=1,a_1=5,a_2=3,a_3=4[/tex]

1 mole of octane reacts with 5 moles of oxygen gas to gives 3 moles of carbon dioxide and 4 moles of water as a product.

Answer:

We use the general gas law or the combined gas law to solve this kind of problem

Explanation:

The general gas law is a combination of both Boyle's law and Charle's law. It is expressed as:

                      [tex]\frac{ P₁V₁}{T₁}[/tex] =  [tex]\frac{ P₂V₂}{T₂}[/tex]

The unkown is V₂ which can be derived by substituting in the equation above.

The general gas law assumes that, n, the number of mole is 1

Answer:  To determine the final Volumen of the gas we use the Combined gas law

Explanation:

The combined gas law combines three gas laws: Boyle's Law, Charles' Law, and Gay-Lussac's Law, this law links pressure, volume, and temperature of a giving gas, from initial conditions ( expressed with the number 1) to final conditions (expressed with the number 2)

P1V1 / T1 = P2V2 / T2

P1 = 745 mm Hg

V1 = 1,56 L

T1 = 27°C + 273,17K = 300.15 K

P2 = 700 mm Hg

V2 = x (the unknown you're solving for)

T2 = 100°C + 273,15K = 373.15 K

V2 = (P1 V1 T2) / (P2 T1)

V2= (745 mm Hg  .  1,56 L . 373.15 K) / ( 700 mm Hg  . 300.15 K )

V2 =  2,06 L

Answer:

1 is Cardiac muscles

2 is To control body activities through the release of chemicals

3 is Bacteria

Explanation:

Answer:

1. Skeletal Muscles

2. To control body activities through the release of chemicals

3. Parasite

Answer:

The answer is 1-butene

Explanation:

Answer:

C. As the temperature increases, the speed of gas molecules increases

Answer:

C. As the temperature increases, the speed of gas molecules increases.

Explanation:

The following are the basic assumptions of the Kinetic Molecular Theory:

So, the right choice is:

C. As the temperature increases, the speed of gas molecules increases.

Answer:

Explanation:

                   aCa + bCO₂ +  cO₂ →  dCaCO₃

Chemical reactions obey the law of conservation of matter. The law states that  "matter is neither created nor destroyed in the course of a chemical reaction". From this, we can deduce that the total mass of the products and reactants are equal.

To balance a chemical reaction, we can do so by inspecting the atoms/compounds involved and putting the appropriate coefficients at the back of the reactants and products. For equations in which inspection might not easily work, we can use a mathematical approach.

By inspecting the reaction above, we can easily balance it

Using the mathematical approach:

The coefficients are a,b,c and d. They are needed to conserve the atoms. So:

For Conservation of Ca: a = d                        (i)

                                  C: b = d                       (ii)

                                  O: 2b + 2c = 3d            (iii)

if we assume that a = 1, then d = 1

                               b = 1

                    from (iii): 2c = 3d -2b

                                    2c = 3- (2 X 1)

                                     2c = 1

                                        c = [tex]\frac{1}{2}[/tex]

Therefore we have a = 1

                                  c = [tex]\frac{1}{2}[/tex]

                                  b = 1

                                   d = 1

                              aCa + bCO₂ +  cO₂ →  dCaCO₃

                           Ca + CO₂ + [tex]\frac{1}{2}[/tex]O₂ → CaCO₃

Nocturnal animals that burrow underground during the day and are active at night are found in the desert biome.

The biome that has many nocturnal animals that burrow underground during the day and are active at night is the desert biome. In the desert, animals like rodents, reptiles (such as lizards and snakes), and insects have adapted to the extreme temperatures by being active during the cooler nights and seeking shelter from the sun during the day. Examples of nocturnal animals in the desert biome include kangaroo rats, fennec foxes, and scorpions.

Final answer:

The desert biome is characterized by nocturnal animals that burrow during the day to avoid heat and are active at night when temperatures drop.

Explanation:

The biome that you're referring to, where many nocturnal animals burrow underground during the day and are active at night, is likely the desert biome. Nocturnal animals, such as bats, foxes, and coyotes, are active at night partly because the temperature is cooler and more manageable, which is particularly important in the hot desert environment. These animals have adapted to their warm habitats by being active during the cooler nocturnal hours to conserve water and energy. Additionally, nocturnality may help them avoid predators and take advantage of the nighttime ecology, such as different prey species that are also active at night.

Nitric acid does NOT react with water, water disassociates the molecules into those ions (above). ... Water,Being a polar solvent,…makes HNO3 ionise or dissociate or simply break down into Hydronium ions, i.e,H+ or H3O+ ions and nitrate NO3- ions..that's all.

-Google

HNO3, or nitric acid, when placed in water, ionizes completely, producing hydronium ions (H3O+) and nitrate ions (NO3-). It can also engage in neutralization reactions with bases to form water and a salt.

When nitric acid (HNO3) is placed in a water solution, it ionizes completely to produce hydronium ions (H3O+) and nitrate ions (NO3-). In this reaction, nitric acid acts as a strong acid. This can be represented by the following equation: HNO3 + H2O → H3O+ + NO3-.

Nitric acid can also react with other substances in water. For example, when HNO3 reacts with a base like Ba(OH)2, a neutralization reaction occurs to form water and a salt (Ba(NO3)2): Ba(OH)2 (aq) + 2HNO3(aq) → Ba(NO3)2(aq) + 2H2O(l).

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Kilometer - km - 1,000

Hectameter - hm - 100

Decameter - dam - 10

Millimeter - mm - 0.001

The table provides clear prefix rules.

The prefixes can be used for most (if not all) units such as grams (kg,mg...).

Hello there i hope you are having a good day :) Answer :

Prefix with the base unit meter :   Symbol :        Number of meters  :

. (kilometre)                                       (Km)              =   1000 m

. (Hectometre)                                   (HM)             =   100 m

. (Decameter)                                    (Dam)            =   10 meters

. (Millimetre)                                       (mm)             =   0.001 meters

Hopefully this help you :)

Answer:

CO2 is a compound of carbon and oxygen.

Answer:

CO2

Explanation:

A compound is a  substance  that consists molecules that are formed by atoms from different elements that are bond together. According to this, from the options given, the compound is CO2.

The other options are not right because they only have one element.

Answer:

3. a.) BECAUSE the positive protons and negative electrons must balance each other’s charges out

4. a.) BECAUSE the number of protons must stay the same even if the number of neutrons changes (atoms are partially defined by their number of protons)

5. b.) BECAUSE there are 3 atoms (2 hydrogen and 1 oxygen) and 10 electrons shared between them

Answer:

The red liquid in a thermometer tells you what temperature the thermometer has. So when you dip that thermometer in a warm substance, the red liquid (generally mercury) rises because the warmth makes the liquid expand or jump. The vice versa occurs with a cold substance. That's why you see the liquid going down when you put the thermometer on an ice cube.

Explanation:

Final answer:

A thermometer measures temperature by relying on the thermal expansion and contraction of a substance such as mercury or alcohol within a reservoir. The liquid's volume changes are visible along a graduated scale, providing a temperature reading. Material properties like specific heat and thermal conductivity are critical in thermometer design for performance and accuracy.

Explanation:

A thermometer operates on the principle of thermal expansion, which is the tendency of a substance to change in volume in response to a change in temperature. When a substance is heated, its particles move more vigorously, causing it to expand. Conversely, when the substance is cooled, the particles lose energy and move less, leading to contraction. This behavior is harnessed in a thermometer.

In the case of a mercury or alcohol thermometer, the liquid inside the reservoir expands as it is heated and contracts when it cools. This causes the visible level of the liquid to rise or fall along a calibrated scale, corresponding to the temperature. It's important that the material used for this liquid has uniform thermal expansion properties over the temperature range of interest. This ensures that the thermometer provides a reliable measurement of temperature changes.

When designing a thermometer, aspects such as specific heat and thermal conductivity must be considered. A material with high specific heat requires more energy to change its temperature, which can slow down the response time of the thermometer. On the other hand, thermal conductivity impacts how quickly the material reaches thermal equilibrium with its surroundings, which affects the speed of the reading as well.

Answer: I believe the question being asked upon is the 5.2.5 Quiz: Interactions in Ecosystems, which the answer would be, by drinking and by eating other living things, or species.

Explanation: Animals rely on rivers, lakes, and streams for water, which is apart of over environment. Furthermore, animals contain nutrients and water. Therefore, the answer would be, by drinking and by eating other living things. As a student, I read the study, or text, the study goes more in depth regarding the answer to this question in pages 11-18. Have a good day, and make sure to study! ♡︎ P.s. Also added a picture!

Answer:Interactions in Ecosystems, which the answer would be, by drinking and by eating other living things, or species.

Explanation:

Answer:

Gas

Explanation:

Nitrogen is an element. It's a gas at room temperature. Nitrogen makes up about 78% of the Earth's atmosphere. Liquid nitrogen is very cold, so it is often used to freeze food.

Answer:

carbon monoxide (CO) or nitric oxide (NO),

Explanation:

Answer:

B. They bond identical atoms together

Explanation:

Metallic Bond:  This is the bond that exists among the atoms of the metal.  This is a type of electrostatic attraction between conduction electrons of metallic atom and their positively charged metal ions.

                                        (figure attached)

Example:  

Copper is a metallic element and its atoms consist of metallic bond among their selves.  

Options A, B, D are not correct as all states for a kind of ionic bond formation.

Ionic bond:  

It form by the complete transfer of electron from one atom to other

It is formed among two atoms of different electronegativities.

Also metals are electro-positive and non -metals are electro-negative so they form ionic bond.

Example is NaCl where sodium is a metal and Chloride is non-metal and they from ionic bond.

Answer:

C. They bond identical atoms together.

Explanation:

Answer:

A

Explanation:

All of the other options are ways that could help the environment from the chemicals, but if they just continue to use the chemicals then it would hurt the environment

Final answer:

Environmental problems caused by chemicals often involve contamination of ecosystems and food supplies, with substances like DDT and PCBs serving as examples of harmful environmental alterations.

Explanation:

An environmental problem caused by chemicals can manifest in various forms, including contamination of ecosystems and food supplies with harmful chemical agents. For example, chemicals such as DDT and its breakdown product DDE, or industrial chemicals like polychlorinated biphenyl (PCB), have contaminated food sources and adversely affected the environment. Persistent organic pollutants, introduced into the environment without a natural occurrence or in unnatural ratios, are known to cause environmental alterations, with their full scale of effects being difficult to calculate. This kind of problem highlights the significant role of chemists and chemical engineers in addressing the challenges posed by these substances, fostering environmentally beneficial chemistry and responsible manufacturing practices.

Answer:

True

Explanation:

There are four time zones in the continental United States: Eastern, Central, Mountain and Pacific.

There are four time zones in the continental United States. Hence, option A is correct.

A continent is a large continuous mass of land conventionally regarded as a collective region.

There are actually six time zones in the USA.

The four main ones are Eastern, Central, Mountain, and Pacific Standard Time.

Hence, option A is correct.

Learn more about the continental here:

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Hello There!

Your answer is In Image Provided.

Answer:

B . Climate

Explanation:

lunch is temporary to diet is long lasting so , weather is temporary and climate is long lasting  

Today's weather is related to climate, where weather indicates the short-term atmospheric conditions and climate represents long-term patterns, similar to a single meal in relation to an overall diet.So,option B is correct.

Today's lunch is related to your overall diet in the same way that today's weather is related to climate. While the individual meal you eat today is a single occurrence that contributes to your dietary pattern over time, today's weather refers to the specific atmospheric conditions present at a given moment. In contrast, the climate refers to the long-term, predictable atmospheric conditions of a specific area. Weather can be considered the short-term variation, just like one meal is to an overall diet, while climate represents the long-term trends in weather patterns, similar to how a diet represents long-term nutritional habits.

Answer:

Explanation:

In a chemical formula, the oxidation state of transition metals can be determined by establishing the relationships between the electrons gained and that which is lost by an atom.

We know that for compounds to be formed, atoms would either lose, gain or share electrons between one another.

The oxidation state is usually expressed using the oxidation number and it is a formal charge assigned to an atom which is present in a molecule or ion.

To ascertain the oxidation state, we have to comply with some rules:

For example, let us find the oxidation state of Cr in Cr₂O₇²⁻

This would be:  2x + 7(-2) = -2

                          x = +6

We see that the oxidation number of Cr, a transition metal in the given ion is +6.

Answer: it's total charge of something I already forgot

Explanation: finished quiz don't listen to Einstein above me why do u think he got little votes and likes

CO+2 H2=CH3OH

2.85 mol Co x (2mol H2/1 mol Co)=5.70 mol just concert to grams

5.70 mol H2 x (2 g H2/1 mol H2) =11.40 grams of H2

To react with 2.85 moles of CO, 11.4912 grams of hydrogen gas (H₂) are necessary based on the balanced equation 2 H₂ + CO → CH₃OH.

To determine how many grams of hydrogen are necessary to react with 2.85 mol of CO, we need to refer to the balanced chemical reaction equation that hydrogen and CO might participate in. One such reaction is the synthesis of methanol:

2 H₂ + CO → CH₃OH

According to this equation, 2 moles of hydrogen gas (H₂) react with 1 mole of carbon monoxide (CO) to produce methanol (CH₃OH). Therefore, to react with 2.85 moles of CO, we would need 5.70 moles of hydrogen gas (2 x 2.85 moles of CO). To convert moles of hydrogen to grams, we multiply by the molar mass of hydrogen (approximately 2.016 g/mol for H₂).

5.70 moles H₂ x 2.016 g/mol = 11.4912 g of H₂

Thus, 11.4912 grams of hydrogen are necessary to react with 2.85 moles of CO.

Answer:

During incomplete combustion of hydrocarbons/carbon carbon monoxide, water and carbon are produced as byproducts instead of CO2. Insufficient combustion usually takes place when the supply of air or oxygen is inadequate.

The general reaction of insufficient combustion:

Hydrocarbon + oxygen → carbon monoxide + carbon + water

In this reaction, carbon is produced as soot. Carbon monoxide is an air pollutant.

Impacts:

1- Incomplete combustion causes suffocation and ultimately death.

2- CO is taken inside the lungs and combines with hemoglobin molecules and reduces the oxygen-carrying capacity of the blood.

Answer:

5.75 g.

Explanation:

∴ 46 g →(first half-life) 23 g →(second half-life) 11.5 g →(third half-life) 5.75 g.

When reduction occurs, an element gains electrons and its oxidation number decreases or is reduced (becomes more negative). To determine if a redox reaction has occurred and to identify the element oxidized and the element reduced: . Compare oxidation numbers from the reactant side to the product side of the equation.

the thing that must change Speed

Answer:

The Speed of the object must change in order to keep moving or stop moving so your answer would be A. Only its speed

Explanation:

Answer:

Structural

Explanation:

Isomerism is the existence of two or more compounds with the same molecular formula but different molecular structures due to the difference in the arrangement of atoms or spatial orientation of atoms.

Isomers have the same molecular formula but differs in their structural arrangement.

In organic chemistry, Isomerism can orginate from different arrangement of atoms.

It can be carbon chain length known as chain isomerism. Here, the carbon length is changed and arranged in different ways.

We can also have position isomerism which entails the position of the functional group in the structure.

It can also be functional group isomerism which deals with the possible arrangement of the group on the chain.

Isomers have the same molecular formulas but different structural formulas. This different structural arrangement leads to differences in the physical and chemical properties of the isomers.

Isomers are molecules that have the same molecular formula, meaning the same number and type of atoms, but different arrangements of atoms within the molecule. Hence, isomers have different structural formulas, which are used to represent the three-dimensional arrangement of atoms in a molecule. For instance, the compounds butane and isobutane both have the formula C4H10, but in butane, all four carbon atoms are arranged in a row, while in isobutane, three carbon atoms form a branch off a central carbon atom. Therefore, the structural formulas of these compounds differ, even though the molecular formula is the same.

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