Answer:
Si is the answer I hope this help
How many moles of tungsten atoms are there in 9.6×10^25 atoms of bromine
Answer:
There are two questions here;
1. How many moles of tungsten atoms are there in 9.6*10^25 atoms of bromine?
This question is invalid as it is quite impossible to obtain the number of moles of tungsten atoms in another element, bromine. The question would have been written as the number of moles of tungsten atoms in 9.6*10^25 atoms of tungsten or bromine as the case may be.
To solve for the number of moles of an atom; we should recur that
I mole of an atom = 6.02*10^23 atoms
6.02*10^23 atoms = 1 mole
9.6*10^25 atoms = (9.6 *10^25 / 6.02*10^23) moles
= 1.595 *10^2 moles
2. The reaction of 9 moles of O2 will produce -------- moles of H2O in the combustion reaction of propane.
C3H8 + 5O2 -------> 3CO2 + 4H2O
5 moles of O2 produces 4 moles of H2O
9 moles of O2 will produce (9 * 4/ 5) moles of H2O
= 7.2 moles of H2O
9moles of O2 will produce 7.2 moles of H2O.
Consider a reaction in which two reactants make one product (for example, consider the unbalanced reaction ). You know the following: 2.0 mol A (with an excess of B) can produce a maximum of 2.0 mol C 3.0 mol B (with an excess of A) can produce a maximum of 4.0 mol C If you react 2.0 mol A with 3.0 mol B, what is the maximum amount of C that can be produced
Answer: The maximum amount of C that can be produced is 2.0 mol.
Explanation:
The balanced equation will be as follows.
[tex]4A + 3B \rightarrow 4C[/tex]
As we are given that,
moles of C = moles of A = [tex]\frac{4}{3}[/tex] moles of B
When we react 2.0 mol A with 3.0 mol B then the limiting reagent is A as specie A has less number of moles. Therefore, the maximum amount of C which can be produced is as follows.
[tex]\frac{2.0}{4} \times 4[/tex]
= 2.0 mol
Therefore, we can conclude that the maximum amount of C that can be produced is 2.0 mol.
The maximum amount of product C that can be produced when reacting 2.0 mol A with 3.0 mol B is 2.0 mol C.
This is because the stoichiometry of the reaction indicates that 2.0 mol A can produce a maximum of 2.0 mol C, and this is the limiting reactant in the reaction. The information that 3.0 mol B can produce 4.0 mol C is irrelevant in this case since B is in excess and the amount of product C formed is limited by the amount of reactant A.
To understand this, let's consider the stoichiometry of the reaction:
[tex]\[ aA + bB \rightarrow cC \][/tex]
From the given information, we can deduce the following stoichiometric coefficients for the reactants:
[tex]\[ 2.0 \text{ mol A} \rightarrow 2.0 \text{ mol C} \] \[ 3.0 \text{ mol B} \rightarrow 4.0 \text{ mol C} \][/tex]
However, since A is the limiting reactant, we use its stoichiometry to determine the maximum amount of C that can be produced:
[tex]\[ 2.0 \text{ mol A} \rightarrow 2.0 \text{ mol C} \][/tex]
Thus, even though there is excess B that could theoretically produce more C, the actual amount of C produced is constrained by the amount of A present. Therefore, the reaction of 2.0 mol A with 3.0 mol B will yield 2.0 mol C, as A is the limiting reactant.
Which statements describe events that occur during interphase? Check all that apply.
A cell grows to its full size.
The cytoplasm of the cell divides.
The nucleus divides into two identical nuclei.
Two identical cells are formed.
The cell copies its DNA.
Answer:
A cell grows to its full size, The cell copies its DNA
Explanation:
I just did that question
During interphase, a cell grows to its full size and it copies its DNA. Division of the cytoplasm, nuclear division, and formation of two identical cells occur later in the cell cycle, not during interphase.
Explanation:The events that occur during interphase, which is a phase in the cell cycle, include the following:
A cell grows to its full size - This is one of the major processes that occur during the initial part of the interphase (G1 phase).The cytoplasm of the cell divides - This event doesn't occur during interphase. It happens during a later phase called cytokinesis.The nucleus divides into two identical nuclei - This occurs during the mitosis phase, not during the interphase.Two identical cells are formed - This is the result of the whole cell cycle, not just the interphase.The cell copies its DNA - This event happens in the synthesis (S) phase of the interphase, where each chromosome is replicated.Learn more about Interphase here:https://brainly.com/question/30622117
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If it takes 43.2 mL of 0.1 M NaOH to neutralize a 50 mL HCl solution, how many moles of NaOH were added to the HCl solution?
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An apparatus for testing conductivity is placed in a solution. The power supply is turned on and the light bulb glows brightly. This indicates that
a.is saturated.
b.is supersaturated
c.contains an electrolyte.
d.is heterogeneous.
Answer:C
Explanation:
Final answer:
A brightly glowing light bulb in a conductivity apparatus indicates the presence of an electrolyte in the solution, meaning it contains enough ions to conduct electricity.
Explanation:
When a conductivity apparatus is placed in a solution and the light bulb glows brightly, this indicates that the solution contains an electrolyte. An electrolyte is a substance that dissociates into ions when dissolved in water, which allows the solution to conduct electricity.
The brightness of the light bulb in the conductivity apparatus depends on the concentration of ions in the solution. A bright light suggests a high concentration of ions, corresponding to a strong electrolyte, while a dim light would indicate a lower concentration of ions, which would be a weak electrolyte.
The conductance of an aqueous solution containing the substance can be measured to identify if a substance is a strong, weak, or nonelectrolyte. To conduct electricity, the solution must contain freely mobile, charged species. Therefore, when the power supply is turned on and the light bulb in the conductivity apparatus glows brightly, the solution provides a path for the current to flow due to the presence of these charged ions.
Describe the effect of water temperature on the amount of dissolved gases in water.
Polar solute dissolve in polar solvent and non polar solute dissolve in non polar solvent. Solubility is directly proportional o temperature. The solubility increases with temperature.
What is solubility?Solubility shows the extent of solubility of a solute in solvent to make a solution. Solute is substances that is present in small amount. solvent is a substance that is present in large amount. Its SI unit is gram per litre or g/L.
Bond strength affect the solubility of a solute in solvent. weaker the bond strength is, more the solubility is. The weaker bond can be easily broken by water molecule.
The solubility increases with temperature. The increase in kinetic energy that comes with higher temperatures allows the solvent molecules to more effectively break apart the solute molecules that are held together by intermolecular attractions.
Therefore, solubility increases with temperature.
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The solubility of gases in water decreases as the temperature increases, a phenomenon explained by the disruption of attractive forces between gas molecules and water due to added thermal energy. This inverse relationship has significant implications, including the effects of thermal pollution on dissolved oxygen levels in natural water bodies and the principles underlying decompression sickness in divers.
The relationship between water temperature and the amount of dissolved gases follows an inverse pattern. As the temperature of water increases, the solubility of gases decreases. This phenomenon can be explained by examining the nature of molecular interactions and the process of dissolution. When gases dissolve in water, they form attractive interactions with water molecules. Dissolving is generally an exothermic process for gases, meaning it releases heat. However, with the addition of heat to the system—which is what happens when water temperature rises—this thermal energy disrupts the attractive forces between gas molecules and water, leading to a decrease in the gas's solubility.
Temperature, solubility, and dissolved gases are intricately linked. For instance, in natural water bodies, an increase in temperature due to thermal pollution can lead to lower dissolved oxygen levels, impacting aquatic life. Moreover, the principles governing this relationship also explain phenomena such as the release of gases from a carbonated beverage upon opening. This scenario is a direct application of Henry's Law, which states that the solubility of a gas in a liquid at a specific temperature decreases as the partial pressure of that gas above the liquid decreases.
The practical implications of this phenomenon extend to various scenarios, including environmental impacts like thermal pollution and human activities such as diving, where understanding the solubility of gases is crucial to avoiding decompression sickness.
Consider the balanced equation for the decomposition of ozone:
2O3(g) 3O2(g)
Can the rate law for this chemical reaction be deduced from its balanced equation?
A)Yes; since the reactant and product are both oxygen gases, the reaction takes 0 seconds.
B)Yes; the coefficients of the balanced equation determine the order of the reaction.
C)No; the rate law must be determined experimentally.
D)No; the rate will change randomly.
Answer:
C)No; the rate law must be determined experimentally.
Explanation:
Rate Laws are empirical relationships defining rates of reaction. For any given reaction The Empirical Rate Law is the product of the concentration of the reactants raised to the power of their order of reaction. That is, for the hypothetical reaction aA + bB => Products its Empirical Rate Law is ...
Rate = k[A]ᵃ[B]ᵇ where k = the rate constant and a & b are orders of reaction.
Order of reaction is a 'rate trend' when one changes a rate factor such as concentration. This can only be determined by experimental observation by physically increasing or decreasing concentration and observing the change in reaction rate relative to a reference reaction of interest. Typically they are whole numbers but can be decimal fractions.
By graphing experimental outcomes of Rxn Rate vs Change in Concentration one can define the order of reaction. Observations give ...
0-order reactions => change concentration => no change in rate
1st order reactions => change concentration => proportional linear change in rate
2nd order reactions => change concentration => exponential change in rate.
Answer:
The answer is C
Explanation:
I had the question on edg
CK-12 Boyle and Charles's Laws if Mrs. Pa pe prepares 12.8 L of laughing gas at 100.0 k Pa and -108 °C and then she force s the gas into an 855 mL cylinder whe re it warms to room temperature at 22 °C, NC what is the pressure of this gas in kilopascals
Answer:
The answer to your question is P2 = 2676.6 kPa
Explanation:
Data
Volume 1 = V1 = 12.8 L Volume 2 = V2 = 855 ml
Temperature 1 = T1 = -108°C Temperature 2 = 22°C
Pressure 1 = P1 = 100 kPa Pressure 2 = P2 = ?
Process
- To solve this problem use the Combined gas law.
P1V1/T1 = P2V2/T2
-Solve for P2
P2 = P1V1T2 / T1V2
- Convert temperature to °K
T1 = -108 + 273 = 165°K
T2 = 22 + 273 = 295°K
- Convert volume 2 to liters
1000 ml -------------------- 1 l
855 ml -------------------- x
x = (855 x 1) / 1000
x = 0.855 l
-Substitution
P2 = (12.8 x 100 x 295) / (165 x 0.855)
-Simplification
P2 = 377600 / 141.075
-Result
P2 = 2676.6 kPa
24.568 cm of chlorine at 25° C will occupy what volume
at -25°C while the pressure remains constant?
Answer:
20.446cm3
Explanation:
The following were obtained from the question given:
V1 (initial volume) = 24.568 cm3
T1 (initial temperature) = 25°C = 25 + 273 = 298K
T2 (final temperature) = - 25°C = - 25 + 273 = 248K
V2 (final volume) = ?
Since the pressure is constant, the gas is obeying Charles' law. With the Charles' law equation V1/T1 = V2/T2, we can easily calculate the final volume as follow:
V1/T1 = V2/T2
24.568/298 = V2/248
Cross multiply to express in linear form as shown below:
298 x V2 = 24.568 x 248
Divide both side by 298
V2 = (24.568 x 248) /298
V2 = 20.446cm3
From the calculations made above, the volume of the gas at -25°C is 20.446cm3
What is the concentration of fecl3 in a solution prepared by dissolving 10.0 g of fecl3 in enough water to make 275 ml of solution?
Answer:
0.225M of Fecl3
Explanation:
No of mole=mass/molar mass
Molar mass of fecl3= 162g/Mol
No of mole= 10/162= 0.062mol
No of Mol = concentrate × volume
Concentration= n/V = 0.062/0.275
C= 0.225M of FeCl3
Suppose that you have 135 mL of a buffer that is 0.360 M in both propanoic acid ( C 2 H 5 COOH ) and its conjugate base ( C 2 H 5 COO − ) . Calculate the maximum volume of 0.240 M HCl that can be added to the buffer before its buffering capacity is lost.
202.50 ml is the maximum volume of 0.240 M HCl that can be added to the buffer before its buffering capacity is lost.
Explanation:
Data given:
volume of buffer = 135 ml or 0.135 litres
molarity of the buffer = 0.360 M
volume of the acid = ?
molarity of the acid = 0.24 M
the number of moles of conjugate base is
M X V = number of moles
0.360 X 0.135
0.0486 moles of conjugate base
The maximum amount of acid added will equal the amount of conjugate base from the buffer.
So, the volume of acid will be calculated by using the formula:
Molarity = [tex]\frac{number of moles}{volume}[/tex]
volume = [tex]\frac{0.0486}{0.24}[/tex]
= 0.2025 l
202.50 ml is the volume of acid added.
Question 2 (1 point)
A cold glass of water collects water droplets on the outside on a hot summer day.
What is the best explanation for this?
The water vapor in the air releases energy to the cold water in the glass causing
the vapor to become liquid that collects on the sides of the glass.
The water vapor in the air gains energy and collides against the sides of the cold
glass resulting in water droplets forming on the sides of the glass.
The cold water in the glass heats up and then this water collects in droplets on
the sides of the glass.
The cold water in the glass releases energy to the water vapor in the air causing
it to collect on the outside of the glass.
Answer:
The water vapor in the air releases energy to the cold water in the glass causing
the vapor to become liquid that collects on the sides of the glass.
Explanation:
Matter exist in solid, liquid and gaseous states. The energy of particles constituting each state of matter differs. In the gaseous state, the particles that compose matter are highly energetic and move at high speeds. Liquid particles possess lower energy and solid particles are the least energetic.
When water vapour in air comes in contact with a cold glass of water, heat exchange occurs. The energetic gas particles of water vapour looses energy to the cold water particles. This causes the water vapour outside the glass to condense to liquid and collects outside the glass.
The best explanation for water droplets collecting on the outside of a cold glass of water on a hot summer day is: Option (1.)The water vapor in the air releases energy to the cold water in the glass causing the vapor to become liquid that collects on the sides of the glass.
This process is called condensation.
On a hot day, the air is typically humid, meaning it contains a significant amount of water vapor. When the humid air comes into contact with the cold surface of the glass, the temperature of the air near the glass drops. If this temperature drops below the dew point (the temperature at which air becomes saturated with moisture), the water vapor in the air condenses into liquid water. This is because the cold surface of the glass absorbs heat from the water vapor, causing the vapor to lose energy and change from a gaseous state to a liquid state, forming droplets on the outside of the glass.
Cryolite, Na 3 AlF 6 ( s ) , Na3AlF6(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. Balance the equation for the synthesis of cryolite. equation: Al 2 O 3 ( s ) + NaOH ( l ) + HF ( g ) ⟶ Na 3 AlF 6 + H 2 O ( g ) Al2O3(s)+NaOH(l)+HF(g)⟶Na3AlF6+H2O(g) If 17.3 kg of Al 2 O 3 ( s ) , 17.3 kg of Al2O3(s), 52.4 kg of NaOH ( l ) , 52.4 kg of NaOH(l), and 52.4 kg of HF ( g ) 52.4 kg of HF(g) react completely, how many kilograms of cryolite will be produced?
Answer:
The mass of cryolite will be produced = 71247 g or, 71.247 kg
Explanation:
The balanced chemical equation for the synthesis of cryolite
Al₂O₃(s) + 6 NaOH(l) + 12 HF(g) → 2 Na₃AlF₆ + 9 H₂O(g)
Which of the following is not an effect of climate change?
Rising sea levels
Coastal flooding
Increased glacial ice
Extreme weather
Answer:
coastal flooding
Explanation:
Answer:
Increased heat, drought and insect outbreaks, all linked to climate change, have increased wildfires. Declining water supplies, reduced agricultural yields, health impacts in cities due to heat, and flooding and erosion in coastal areas are additional concerns.
Explanation:
If 24.2 g of hydrogen react with excess oxygen and 198 g of water are produced what is the percent yield?
Answer:
90.9% is the percent yield of the reaction.
Explanation:
Mass of hydrogen gas = 24.2 g
Moles of hydrogen = [tex]\frac{24.2 g}{2g/mol}=12.1 mol[/tex]
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
According to reaction, 2 moles of hydrogen gas gives 2 moles of water , then 12.1 moles of hydrogen will give:
[tex]\frac{2}{2}\times 12.1mol=12.1mol[/tex] water
Mass of 12.1 moles of water
= 12.1 mol × 18 g/mol = 217.8 g
Theoretical yield of water = 217.8 g
Experimental yield of water = 198 g
The percentage yield of reaction:
[tex]=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100[/tex]
[tex]=\frac{198 g}{217.8 g}\times 100=90.9\%[/tex]
90.9% is the percent yield of the reaction.
What is parthenolide
Which of these did you include in your response?
A strong electrolyte dissociates or ionizes completely in water.
A weak electrolyte dissociates or ionizes partially in water.
A nonelectrolyte does not dissociate or ionize in water.
The more ions in solution, the better the solution will conduct electricity.
To test each solution, use a conductivity apparatus. If the bulb lights, the solution is an electrolyte. The brighter the bulb, the stronger the electrolyte.
Answer:
Check all of them
Explanation:
All are correct.
- stong electrolytes dissolve completely
- weak disolve partially
- nonelectrolytes do not dissolve
Answer:
Check allExplanation:
1 mole of NaCl is dissolved in a 1000 grams of water and 1 mol CaCl2 is dissolved in a second beaker containing 1000 grams of water. Which statement is MOST accurate?
A) The CaCl2 beaker has more ions in solution.
B) The NaCl solution has more particles dissolved in the water.
C) The CaCl2 has a lower boiling point than the NaCl solution.
D) The NaCl solution has a lower freezing point that the CaCl2 solution,
Answer: the answers is A) The CaCI2 beaker has more ions in solution.
Explanation:
The CaCl2 beaker has more ions in solution. Therefore, the correct option is option A among all the given option.
What is ion?An atom or molecule is said to be an ion if one or more of its electrons in the valence state have been gained or lost, giving it a net positive and negative electrical charge. In other terms, a chemical species has an unbalanced quantity of protons compared to electrons.
Monatomic ions are defined as those made up of just one atom. The hydrogen ion H+ serves as an illustration. Polyatomic ions, also known as molecular ions, on the other hand, are made up of two or more atoms. 1 mole of NaCl is dissolved in a 1000 grams of water and 1 mol CaCl[tex]_2[/tex] is dissolved in a second beaker containing 1000 grams of water. The CaCl2 beaker has more ions in solution.
Therefore, the correct option is option A.
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balance the equation C2H4O2 + O2 → CO2 + H2O
Answer:
Explanation:
[tex]C_{2}H_{4}O_{2}+2O_{2}[/tex] → [tex]2CO_{2}+2H_{2}O[/tex]
The balanced chemical equation is C₂H₄O₂ + (3/2)O₂ → 2CO₂ + 2H₂O.
A balanced chemical equation is an equation that represents a chemical reaction with an equal number of atoms of each element on both sides of the equation. It follows the law of conservation of mass, which states that matter cannot be created or destroyed during a chemical reaction.
In a balanced chemical equation, the coefficients are used to adjust the number of molecules or atoms involved in the reaction. Balancing chemical equations is essential for accurately representing the stoichiometry of a reaction and understanding the ratios of reactants and products involved.
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Problem PageQuestion A chemistry student needs 10.0g of dimethyl sulfoxide for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of dimethyl sulfoxide is ·1.10gcm−3. Calculate the volume of dimethyl sulfoxide the student should pour out.
Answer:
9.09cm3
Explanation:
The following data were obtained from the question:
Mass of dimethyl sulfoxide = 10g
Density of dimethyl sulfoxide = 1.10gcm−3
Volume of dimethyl sulfoxide =?
The density of a substance is simply the mass substance per unit volume of the substance. It is represented mathematically as:
Density = Mass/volume.
With the above formula, we can obtain the volume of dimethyl sulfoxide as follow:
Density = Mass/volume
1.10gcm−3 = 10g/ volume
Cross multiply to express in linear form
1.10gcm−3 x Volume = 10g
Divide both side by 1.10gcm−3
Volume = 10g / 1.10gcm−3
Volume = 9.09cm3
Therefore, the volume of dimethyl sulfoxide the student should pour out is 9.09cm3
Explain how muscles and bones work together to help bend the arm
Answer:
By contracting, muscles pull on bones and allow the body to move. ... For example, the biceps and triceps muscles work together to allow you to bend and straighten your elbow. When you want to bend your elbow, your biceps muscle contracts (Figure below), and, at the same time, the triceps muscle relaxes.
Explanation:
Answer:
When skeletal muscles contract, bones move. But how do muscles make your bones move? A voluntary muscle usually works across a joint. It is attached to both the bones on either side of the joint by strong cords called tendons. A tendon is a tough band of connective tissue that connects a muscle to a bone. Tendons are similar to ligaments, except that ligaments join bones to each other. Muscles move the body by contracting against the skeleton. When muscles contract, they get shorter. By contracting, muscles pull on bones and allow the body to move.
Muscles can only contract. They cannot actively extend, though they can move or relax back into the non-contracted neutral position. Therefore, to move bones in opposite directions, pairs of muscles must work in opposition. Each muscle in the pair works against the other to move bones at the joints of the body. The muscle that contracts to cause a joint to bend is called the flexor. The muscle that contracts to cause the joint to straighten is called the extensor. When one muscle is contracted, the other muscle from the pair is always elongated.
For example, the biceps and triceps muscles work together to allow you to bend and straighten your elbow. When you want to bend your elbow, your biceps muscle contracts (Figure below), and, at the same time, the triceps muscle relaxes. The biceps is the flexor, and the triceps is the extensor of your elbow joint. Other muscles that work together are the quadriceps and hamstrings used to bend and straighten the knee, and the pectorals and trapezius used to move the arms and shoulders forward and backward. During daily routines we do not use muscles equally. For example, we use our biceps more than our triceps due to lifting against gravity.
The biceps help contract the arm, while the triceps help extend the arm
The biceps and triceps act against one another to bend and straighten the elbow joint. To bend the elbow, the biceps contracts and the triceps relaxes. To straighten the elbow, the triceps contract and the biceps relax.
Hope this helps!
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Which of the following is true about the carbon dioxide cycle?
Carbon dioxide is a waste produce of respiration
The atmosphere stores more carbon dioxide than the ocean
Carbon dioxide is added to the atmosphere by burning fossil fuels
Plants use oxygen to make food during photosynthesis
ANSWER QUICK
Answer:
A & C im 99% sure
Explanation:
Answer: A and C is correct.
Explanation:
Mark brainliest please .
A 100.0 mL sample of 0.20 M HF is titrated with 0.10 M KOH. Determine the pH of the solution after the addition of 75.0 mL of KOH. The Ka of HF is 3.5 × 10-4
The pH of the solution after the addition of 75.0 mL of 0.10 M KOH to a 100.0 mL sample of a 0.20 M HF solution is approximately 2.57. This is calculated using the molar concentrations of HF and KOH, the equilibrium expression for HF, and the pH formula.
Explanation:To calculate the pH of a solution after adding KOH to the HF solution, we first need to calculate the produced moles of HF and KOH. The molar concentration of HF is 0.20 M in 100.0 mL which is equal to 0.02 moles. Furthermore, the molar concentration of KOH is 0.10 M in 75.0 mL which is equal to 0.0075 moles.
Since KOH is a strong base and fully ionizes, all the moles of KOH will react with HF to form F- and H2O. This will result in 0.02 - 0.0075 = 0.0125 moles of HF remaining and 0.0075 moles of F- formed.
Next, we use the Ka expression of HF, which is Ka = [H+][F-]/[HF]. Since HF is a weak acid and partially ionizes, we can assume that the concentration of H+ equals that of F- at equilibrium. Substituting the values, we get 3.5 × 10-4 = x^2/0.0125, solving for x which represents [H+], it's about 0.0027 M
Finally, we can use the definition of pH = -log[H+] to find the pH of the solution, which gives a pH of around 2.57 after adding 75.0 mL of KOH to the HF solution.
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I need help I already filled in one of them though
Answer:2.Sulfur?3.Neptune4.outer
Explanation:
Which best describes a force
Answer:
The answer is A. a vector with magnitude and direction
Explanation:
If you're taking the Lesson 11: Motion & Forces Unit Review the answers are:
1. D. 325 kg · m/s
2. C. It is always the same as it was before the collision
3. C. It increases the time it takes for the person to stop
4. C. a 75kg dining table
5. B. The mass of the rocket decreases as fuel is burned, so the acceleration increases.
6. C. An increase in the distance between the objects causes a greater change in the gravitational force than the same increase in mass.
7. D. The hammer hits the ground before the feather on Earth, and the hammer and feather hit at the same time on the moon.
8. C. C
9. C. Surface 1 is blacktop, Surface 2 is gravel, and Surface 3 is ice.
10. B. using shaving cream, rather than shaving on dry skin
11. A. a vector with magnitude and direction
12. B. 10 N
13. B. There is a net force of 15 N allowing Levi and Clara to move the box.
14. D. Finley → Xander → Max
15. C. Carla slowed down in the beginning of her trip, stopped, and then sped up.
16. A. positive
17. B. His speed was 2 m/s, and his velocity was 0.
18. B. His speed was 2 m/s, and his velocity was 0.
19. A. the ocean surface
20. A. Atlanta
21. B. W
22. A. measurement and direction
**17 & 18 are the same question on the review
I just took the review so these are 100% correct :) (btw these are for Connexus... so yeah but I'm pretty sure they're all the same)
hope this helps :)
A force is a push or pull that can change the motion of an object. It has magnitude and direction, and there are different types of forces such as gravitational, frictional, and magnetic. Forces are measured in Newtons.
Explanation:A force can be defined as a push or pull that can change the motion of an object. It is a vector quantity, which means it has both magnitude and direction. For example, when you push a book on a table, you exert a force on it that causes it to move.
There are different types of forces such as gravitational force, applied force, frictional force, and magnetic force. These forces can be measured using units like Newton (N) in the metric system. Understanding forces is essential in studying mechanics and how objects interact with each other.
In summary, a force is a physical interaction that causes a change in motion. It can be represented by vectors and is measured in units of Newtons.
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Can someone answer this please asap
Answer:
Option C. Kc = [CO2] / [C] [O2]
Explanation:
The balanced equation for the reaction is given below:
C(s) + O2(g) <===> CO2(g)
The equilibrium constant for a reaction is simply the ratio of the concentration of the products to the concentration of the reactants.
Thus, the expression for the equilibrium constant for the above equation is given by:
Kc = [CO2] / [C] [O2]
How many liters are needed to make a 1.5 M solution with 2.5 moles of HCL
Answer:
1.7 L
Explanation:
1.5M = 1.5 mol/1L
1.5 M means that 1 L solution has 1.5 mol HCl
1.5 mol HCl ----- 1 L
2.5 mol HCl ---- xL
x=(2.5*1)/1.5 ≈ 1.7 L solution, so we need 1.7 L of water to make 1.7 L of solution.
Final answer:
To make a 1.5 M solution with 2.5 moles of HCl, you would need 1.67 liters of solution.
Explanation:
To calculate the volume needed to make a 1.5 M solution with 2.5 moles of HCl, we can use the formula for molarity (M), which is moles of solute divided by liters of solution. In this case:
M = moles of solute / liters of solution
Rearranging the formula to solve for the liters of solution, we get:
liters of solution = moles of solute / M
By plugging in 2.5 moles of HCl and a molarity of 1.5 M, the calculation becomes:
liters of solution = 2.5 moles HCl / 1.5 M
liters of solution = 1.67 L
Therefore, you would need 1.67 liters of solution to make a 1.5 M solution of HCl.
A tank contains 36.5 g of O₂ and 46.4 g of N₂ at a pressure of 3.64 atm. What is the pressure of O₂ in the tank (in atm)?
Answer:
Partial pressure O₂ = 1.49 atm
Explanation:
We can solve this, by the mole fraction concept.
Mole fraction = Moles of gas / Total moles
We can also define mole fraction as: Partial pressure of a gas / Total pressure
Total moles = Moles of O₂ + Moles of N₂
36.5 g. 1 mol / 32g + 46.4 g . 1mol /28g = 2.79 moles
1.14 moles O₂ + 1.65 moles N₂ = 2.79 moles
Partial pressure O₂ / Total pressure = Moles of O₂ / Total moles
Partial pressure O₂ = (Moles of O₂ / Total moles) . Total pressure.
We replace: (1.14 mol / 2.79 mol) . 3.64 atm = 1.49 atm
Partial pressure O₂ = 1.49 atm
Nitrogen and hydrogen react to form ammonia as described by the chemical equation below:
N2 + 2 H2 → 2 NH3
If you start with 2 moles of N2, how many moles of NH3 can you make?
Fill in the t-chart below to answer the question.
Answer:
4 moles
Explanation:
The balanced equation for the reaction is given below:
N2 + 3H2 → 2NH3
From the balanced equation above,
1 mole of N2 produced 2 moles of NH3.
Therefore, 2 moles of N2 will produce = 2x2 = 4 moles of NH3.
Therefore, if we start with 2 moles of N2, then, we will produce 4 moles of NH3
Based on the balanced chemical equation, 2 moles of nitrogen can produce 4 moles of ammonia when reacted with sufficient hydrogen. The stoichiometric relationship is used to fill out the T-chart, demonstrating how the initial amounts of reactants lead to the production of the product.
The question at hand is regarding the stoichiometry of a chemical reaction in which nitrogen (N₂) and hydrogen (H₂) react to form ammonia (NH₃). Based on the balanced chemical equation N₂ + 2 H₂ → 2 NH₃, we can determine the stoichiometric relationship between nitrogen and ammonia. Each mole of nitrogen can produce two moles of ammonia. Therefore, starting with 2 moles of N₂, you can make 4 moles of NH₃.
Here is the T-chart filled out based on the balanced chemical equation:
Reaction
2 N₂ + 4 H₂ → 4 NH₃
Initial quantity (mol)
N₂: 2
H₂: -
NH₃: 0
Change (mol)
N₂: -2
H₂: -
NH₃: +4
Final quantity (mol)
N₂: 0
H₂: -
NH₃: 4
Cells are present
A. in only humans.
B.
in all living organisms.
C.
in only plants.
D.
in only animals.
Answer:
B
Explanation:
GOOD LUCK!!!