Answer:
Gravity and Mass.
Explanation:
The Earth has more mass than the moon and therefore a higher force of gravity. Because the Earth has a higher mass and force of gravity the moon is attracted to it.
If an object moves faster and faster, what must change?
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:
Which statement describes the general trends in electronegativity and metallic properties as the elements in Period 2 are considered in order of increasing atomic number?
Answer:
Electronegativity increases and metallic
properties decrease.
Explanation:
The statement which describes the general trends in electronegativity and metallic properties as the elements in Period 2 are considered in order of increasing atomic number are;
Electronegativity increases with increasing atomic number.Metallic properties decreases with increasing atomic number.For electronegativity:
Flourine is the most electronegative of Period 2 elements.For metallic properties:
Lithium is the most metallic of the elements in Period 2.Read more:
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The temperature of 6.24 L of a gas is increased from 25.0°C to 55.0°C at constant pressure. The new volume of the gas is Question 18 options: 2.84 L. 6.87 L. 13.7 L. 5.67 L.
Answer:
Heating this gas to 55 °C will raise its volume to 6.87 liters.
Assumption: this gas is ideal.
Explanation:
By Charles's Law, under constant pressure the volume [tex]V[/tex] of an ideal gas is proportional to its absolute temperature [tex]T[/tex] (the one in degrees Kelvins.)
Alternatively, consider the ideal gas law:
[tex]\displaystyle V = \frac{n \cdot R}{P}\cdot T[/tex].
[tex]n[/tex] is the number of moles of particles in this gas. [tex]n[/tex] should be constant as long as the container does not leak.[tex]R[/tex] is the ideal gas constant. [tex]P[/tex] is the pressure on the gas. The question states that the pressure on this gas is constant.Therefore the volume of the gas is proportional to its absolute temperature.
Either way,
[tex]V\propto T[/tex].
[tex]\displaystyle V_2 = V_1\cdot \frac{T_2}{T_1}[/tex].
For the gas in this question:
Initial volume: [tex]V_1 = \rm 6.24\; L[/tex].Convert the two temperatures to degrees Kelvins:
Initial temperature: [tex]T_1 = \rm 25.0\;\textdegree{C} = (25.0 + {\rm 273.15})\; K = 298.15\;K[/tex].Final temperature: [tex]T_1 = \rm 55.0\;\textdegree{C} = (55.0 + {\rm 273.15})\; K = 328.15\;K[/tex].Apply Charles's Law:
[tex]\displaystyle V_2 = V_1\cdot \frac{T_2}{T_1} = \rm 6.24\;L \times \frac{328.15\; K}{298.15\;K} = 6.87\;L[/tex].
The correct option is b. 6.87 L.
To solve this problem, we can use Charles's Law, which states that the volume of a gas is directly proportional to its temperature in Kelvin at constant pressure. Mathematically, this can be expressed as:
[tex]\[ \frac{V_1}{T_1} = \frac{V_2}{T_2} \][/tex]
where [tex]\( V_1 \) and \( T_1 \)[/tex] are the initial volume and temperature of the gas, respectively, and [tex]\( V_2 \) and \( T_2 \)[/tex] are the final volume and temperature of the gas, respectively.
First, we need to convert the temperatures from Celsius to Kelvin:
[tex]\[ T_1 = 25.0^\circ C + 273.15 = 298.15 \text{ K} \][/tex]
[tex]\[ T_2 = 55.0^\circ C + 273.15 = 328.15 \text{ K} \][/tex]
Now we can rearrange Charles's Law to solve for the final volume [tex]\( V_2 \):[/tex]
[tex]\[ V_2 = V_1 \times \frac{T_2}{T_1} \][/tex]
Substituting the given values:
[tex]\[ V_2 = 6.24 \text{ L} \times \frac{328.15 \text{ K}}{298.15 \text{ K}} \][/tex]
[tex]\[ V_2 = 6.24 \text{ L} \times \frac{328.15}{298.15} \][/tex]
[tex]\[ V_2 = 6.24 \text{ L} \times 1.1007 \][/tex]
[tex]\[ V_2 \approx 6.87 \text{ L} \][/tex]
Therefore, the new volume of the gas after the temperature increase is approximately 6.87 L.
Select the correct answer.
What does the kinetic theory state about the relationship between the speed and temperature of gas molecules?
A.As the temperature increases, the speed of gas molecules remains constant.
B.As the temperature increases, the speed of gas molecules decreases.
C.As the temperature increases, the speed of gas molecules increases.
D. As the speed of gas molecules increases, the temperature becomes constant
E.As the temperature decreases, the speed of gas molecules increases.
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:
Kinetic Molecular Theory states that gas particles are in constant motion and exhibit perfectly elastic collisions. Kinetic Molecular Theory can be used to explain both Charles’ and Boyle’s Laws. The average kinetic energy of a collection of gas particles is directly proportional to absolute temperature only.The following are the basic assumptions of the Kinetic Molecular Theory:
The volume occupied by the individual particles of a gas is negligible compared to the volume of the gas itself. The particles of an ideal gas exert no attractive forces on each other or on their surroundings. Gas particles are in a constant state of random motion and move in straight lines until they collide with another body. The collisions exhibited by gas particles are completely elastic; when two molecules collide, total kinetic energy is conserved. The average kinetic energy of gas molecules is directly proportional to absolute temperature only; this implies that all molecular motion ceases if the temperature is reduced to absolute zero.So, the right choice is:
C. As the temperature increases, the speed of gas molecules increases.
what is the VSEPR theory
Answer:
The VSEPR theory stands for the valence shell electron pair repulsion theory. It is a model used in chemistry to predict the geometry of individual molecules from the number of electron pairs surrounding their central atoms.
Answer:
It predicts individual molecules from electron pairs surrounding the central atom.
Explanation:
Its A Valence Shell Electron Pair Repulsion Theory.
Hope my answer has helped you!
Which of these is a compound
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.
Which of the following is an example of an environmental problem caused by chemicals
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.
Nitrogen is ____ at room temperature. Please fill in the blank and then answer the question. Thank u :)
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.
Which phrase best summarizes how animals get water from the environment
as part of the water cycle?
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:
Describe how is thermometer uses the thermal expansion of a material to measure temperature?
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.
how is the oxidation state of a transition metal determined from the chemical formula ?
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:
The algebraic sum of all oxidation numbers of an atom in a neutral compound is zero. The algebraic sum of all the oxidation numbers of all atoms in an ion containing more than one kind of atom is equal to the charge on the ion.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
Determine which law is appropriate for solving the following problem. What volume will 1.56 liters of a gas at 27°C and 745 mmHg of pressure occupy at 100°C and 700 mmHg of pressure? Law used:
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
In our exercise, we state the initial conditions of the gas, ( keep in mind that this law works only with absolute temperatures, then we need to convert degrees Celsius to the Kelvin scale)P1 = 745 mm Hg
V1 = 1,56 L
T1 = 27°C + 273,17K = 300.15 K
Now we state the final conditions and the parameter we need to calculateP2 = 700 mm Hg
V2 = x (the unknown you're solving for)
T2 = 100°C + 273,15K = 373.15 K
Finally, we take the formula and we isolate the V2 that we are interested in and fill in the rest with the information giving.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
What happens to pressure as temperature increases and temperature decreases
When temperature increases pressure also increases.
When temperature decreases pressure decreases.
That is why you have low tire pressure when it’s cold out
Temperature and Pressure have a direct relationship!
When Temperature increases ↑
Pressure increases ↑
When Temperature decreases ↓
Pressure decreases ↓
There are four time zones in the continental United States.
True
False
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.
What is continental?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.
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what biome has many nocturnal animals that burrow underground during the day that are active at night
Nocturnal animals that burrow underground during the day and are active at night are found in the desert biome.
Explanation: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.
help!!! i need these 3
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
in a redox reaction,how can you tell if an element is being oxidized
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.
what does HNO3 produce when it is placed in a water solution
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.
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.
Explanation: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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Fill in the coefficients that will balance the following reaction:
a0C3H8 + a1O2 → a2CO2 + a3H2O
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.
Name the following compound:
CH2 = CH2 - CH2 - CH3
O Butane
O butyl
O 1-butene
1-butyne
Answer:
The answer is 1-butene
Explanation:
Which of the following statements are true about metallic bonds?
A. They hold together ionic bonds.
B. They bond a metal to a nonmetal.
C. They bond identical atoms together.
D. They hold together atoms with different electronegative.
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:
Today's lunch is related to your overall diet in the same way that today's weather is related to ______________.
A. Precipitation
B. Climate
C. The atmosphere
D. The water cycle
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.
In the sun, hydrogen is converted to ____________________ through nuclear fusion.
helium
carbon
water
Answer:
Helium
In the sun, hydrogen is converted to __Helium__ through nuclear fusion.
Answer:
helium
Explanation:
Give the atomic symbol for an element that exists as a diatomic molecule.
Answer:
carbon monoxide (CO) or nitric oxide (NO),
Explanation:
what does insufficient combustion of carbon produce . mention its impacts
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.
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If a 46 gram sample of a radioisotope, Lead - 189 has a half life of 20 days then how many grams of the sample will remain after 60 days?
Answer:
5.75 g.
Explanation:
It is known that the decay of isotopes of Pb-189 obeys first order kinetics. Also, it is clear that in first order decay the half-life time is independent of the initial concentration. The half life time of Pb-189 decay = 20 days.Thus, 60 hours represent (60/20) 3 half-lives.∴ 46 g →(first half-life) 23 g →(second half-life) 11.5 g →(third half-life) 5.75 g.
So, The amount remained is 5.75 g after 3 half-lives (60 days).
Fill in the coefficients that will balance the following reaction:
a0Ca + a1CO2 + a2O2 → a3CaCO3
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
Classify each property as intensive or extensive. Color, temperature, volume, hardness, mass, boiling point, length, density
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.
Isomers have different ______ formulas. molecular structural empirical chemical
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.
Explanation: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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40 POINTS.will give brainliest happily if helped ASAP
1.
Which of the following muscles are attached to a bone?
Bladder muscles
Cardiac muscles
Skeletal muscles
Stomach muscles
2.
What is the main function of the endocrine system?
To control body activities through the release of chemicals
To help in body movements and maintaining posture
To produce new individuals through fertilization
To exchange gases like oxygen across the body
3.
Which of the following microorganisms is most likely to get its main source of nutrition from a host?
Bacteria
Parasite
T-cell
Virus
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