Answer:
increases
Explanation:
The barometer is a device that uses mercury in order to work and be able to measure the air pressure. The mercury reacts to the air pressure, so it either goes up or down. If the mercury goes down, that means that it is pressed more, thus the air pressure has increased, or rather is higher. If the mercury is lifting up, that means that there is less pressure from the air, thus the air pressure has declined, or rather is lower. It is a simple device that manages to do a very important job, and it is one of the most important devices used by the meteorologists for telling the current weather conditions, as well as predicting them for the next few days.
The oxidation number of sulfur in each of the following is +6 except
A) S2O4^2-
B) SO3
C) Na2SO4
D) SO4^2-
Answer:
A
Explanation:
Oxygen always has a -2 oxidation state, sodium always has a +1 Oxidation state
A: 2(S) + 4(-2) = -2 (overall charge)
2S -8 = -2
2S = 6
S = +3
B: S + -6 = 0 (overall charge)
S = +6
C: 2(+1) + S + 4(-2) = 0 (overall charge)
2 + S - 8 = 0
S - 6 = 0
S = 6
D: S + 4(-2) = -2 (overall charge)
S - 8 = -2
S = 6
Answer:
I believe that the answer is A
Element J is 1s 2s 2p 3s . (i) How many unpaired electrons does J have?
(II) is j a good oxidizing agent or a reducing agent?
(III) state reason for the answer.
Answer:6
Explanation:
3+3
Element J has two unpaired electrons and is likely to be a reducing agent since it can easily lose its single 3s electron.
The electron configuration for element J is understood as 1s² 2s² 2p⁴ 3s₁. To determine how many unpaired electrons it has, we can look at the configuration and see there must be two in the 2p orbital since it can hold up to a maximum of six electrons and there is only four present, thus two are unpaired.
(i) Element J has two unpaired electrons.
(ii) As for it being an oxidizing agent or a reducing agent, elements that easily lose electrons tend to be good reducing agents.
(iii) Given that element J readily loses its single 3s electron and has a high ionization energy, it is likely to be a reducing agent, similar to how sodium reacts with oxygen to release energy and oxidize.
Which statement about enzymes is true
Answer:
whats the statment sis
Explanation:
How many atoms are in 2 mol of Iron
Answer:
It is equal to Avogadro's number (NA), namely 6.022 x1023. If we have one mole of water, then we know that it will have a mass of 2 grams + 16 grams = 18 grams. Since we only have 0.001 grams, that means that we have NA * = 3.35*1019 molecules of water!
Explanation:
I'm just smart.
what is the primary purpose of a rate law
Answer:
The rate law or rate equation for a chemical reaction is an equation that links the reaction rate with the concentrations or pressures of the reactants and constant parameters. For many reactions the rate is given by a power law such as.
Explanation:
The other person Goggled it. So, pick me as Brainliest.
The primary purpose of a rate law is to provide a mathematical framework that links the rate of a chemical reaction to the concentration of its reactants.
The primary purpose of a rate law is to provide a mathematical expression that describes the relationship between the rate of a chemical reaction and the concentration of its reactants. Through rate laws, scientists can calculate expected yields, determine optimum conditions for economic chemical processes, and understand the course of individual reactions. The derivation of rate laws is essential as they are not directly obtained from chemical equations for ordinary reactions but rather determined from experimental data involving the measurement of concentrations over time.
To ascertain a rate law, the method of initial rates is commonly employed. This involves conducting experiments under varying reactant concentrations and measuring the reaction rates to deduce the reaction order and rate constant. These parameters are indispensable for formulating a rate law, which in turn allows for the calculation of reaction rates under different conditions and aids in the identification of the reaction mechanism.
15 points!!!
describe the characteristics of a molecule of ammonia (NH3). the lewis structure and table of electronegative are given.
the bond polarities are BLANK, the molecular shape is BLANK 2, and the molecule is BLANK 3.
blank 1 options: nonpolar, polar
blank 2 options: bent, linear, tetrahedral, trigonometry planar, trigonal pyramidal.
Blank 3 options: nonpolar, polar
each blank has one option.
Answer:
The bond polarities are polar, the molecular shape is trigonal pyramidal, and the molecule is polar.
Explanation:
Which of the following is the best name for a compound made from calcium and bromine? (CaBr2) calcium bromide calcium dibromide monocalcium dibromide calcium bromine II
Answer:
Calcium bromide
Explanation:
When naming compounds, the use of prefixes depend on the type of bond made. In this case, calcium and bromine form a ionic bond because calcium is a metal and bromine is a non-metal.
Ionic bonds are not named using prefixes. So no matter how many atoms there are, you will simply write the name of the element for the first element.
For the second element, you name it as well, but only use the root name and end it with -ide.
A circle is centered at the point (5, -4) and passes through the point (-3, 2). The equation of this circle is (x + )2 + (y + )2 = . Reset
Answer:
[tex](x-5)^{2}+(y+4)^{2}=100[/tex]
Explanation:
We have been given the center of the circle as (5, -4) and a point on the circumference as (-3, 2). We first determine the radius of the circle. The radius is the distance from the center to any point on the circumference. Using the distance formula, we have;
[tex]radius=\sqrt{(5--3)^{2}+(-4-2)^{2}}\\radius=\sqrt{64+36}=10[/tex]
The radius of the circle is thus 10 units.
The equation of a circle with center (a,b) and radius r units is given as;
[tex](x-a)^{2}+(y-b)^{2}=r^{2}[/tex]
Plugging in the values given we have;
[tex](x-5)^{2}+(y+4)^{2}=100[/tex]
18.A 2.50 L sample of dry air in a cylinder exerts a pressure of
3.00 atm at a temperature of 25 C. The cylinder is reduced to
1.00 atm. What is the volume of the gas without a change in
temperature?
Answer:
[tex]\boxed{\text{7.50 L}}[/tex]
Explanation:
The temperature and amount of gas are constant, so we can use Boyle’s Law.
[tex]p_{1}V_{1} = p_{2}V_{2}[/tex]
Data:
[tex]\begin{array}{rclrcl}p_{1}& =& \text{3.00 atm}\qquad & V_{1} &= & \text{2.50 L} \\p_{2}& =& \text{1.00 atm}\qquad & V_{2} &= & ?\\\end{array}[/tex]
Calculations:
[tex]\begin{array}{rcl}3.00 \times 2.50 & =& 1.00V_{2}\\7.500 & = & 1.00V_{2}\\V_{2} & = &\textbf{7.50 L}\\\end{array}\\\text{The volume of the gas is } \boxed{\textbf{7.50 L}}[/tex]
Using Boyle's law, which states that pressure and volume are inversely related at a constant temperature, we find that the volume of the dry air sample increases to 7.50 L when the pressure is reduced to 1.00 atm.
Explanation:The question you asked involves the property of gases described by Boyle's law. This law states that at a constant temperature, the pressure and volume of a gas are inversely proportional. In other words, if the pressure of a fixed amount of gas is decreased, its volume will increase accordingly, assuming the temperature remains the same.
To find the new volume of the gas, we can use the formula P1V1 = P2V2, where P1 is the initial pressure, V1 is the initial volume, P2 is the final pressure, and V2 is the final volume we're looking for. We know that P1 = 3.00 atm, V1 = 2.50 L, and P2 = 1.00 atm. Plugging these values into the equation, we get: 3.00 atm * 2.50 L = 1.00 atm * V2. Solving for V2, we find that V2 = 7.50 L. So, the volume of the gas after reducing the pressure to 1.00 atm, without changing the temperature, is 7.50 L.
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Which is a chemical property of soda ash?
A.
It's a highly basic substance.
B.
It's a white crystalline powder.
C.
It can dissolve in water.
D.
It can be separated from water by distillation.
Answer:
A. It is a highly basic substance.
Explanation:
Soda ash is the trade name of sodium carbonate (NaCO₃)
Sodium carbonate is a highly basic substance as 100% of the substance is equivalent to 58.48% of sodium oxide.
Its pH is 10.97
It reacts with acids producing a salt, carbon (Iv) oxide and water.
Na₂CO₃₍s₎ + 2HCl₍aq₎ → 2NaCl₍aq₎ + CO₂ +H₂O₍l₎
How will the rate at which a solid solute dissolves change if the solution is stirred?
The rate at which the solute dissolves will stay the same.
The rate at which the solute dissolves will increase.
The rate at which the solute dissolves will decrease.
The rate at which the solute dissolves will fluctuate.
Answer:
The rate at which the solute dissolves will increase.
Explanation:
If a solution is stirred, the rate at which a solute dissolves would increase substantially provided the solution is not yet saturated.
Stiring would cause more of the solution to come in contact with every part of the solute. It will increase the surface area of contact for the solution to act which will shoot up the rate of reaction. Stiring helps to bring solutes in solutions into a more close contact with the molecules or compounds of the medium.
40dm3 of gas at 760 torr are heated from 5°C to 50°C what is the new volume
Answer:
46.5 dm3
Explanation:
Charles law
V1/T1= V2/ T2
V2= V1 T2 / T1
V2= 40 278 / 323
V2= 11120/ 323
Answer:
[tex]\boxed{\textbf{46 dm}^{3}}[/tex]
Explanation:
The pressure is constant, so we can use Charles' Law to calculate the volume.
[tex]\dfrac{V_{1}}{T_{1}} = \dfrac{V_{2}}{T_{2}}[/tex]
Data:
V₁ = 40 dm³; T₁ = 5 °C
V₂ = ?; T₂ = 50 °C
Calculations:
(a) Convert temperature to kelvins
T₁ = ( 5 + 273.15) = 278.15 K
T₂ = (50 + 273.15) = 323.15 K
(b) Calculate the volume
[tex]\dfrac{40}{278.15} = \dfrac{V_{2}}{323.15}\\\\{ V_{2}} = 40 \times \dfrac{323.15}{278.15}\\\\V_{2} = 40 \times 1.162 = \boxed{\textbf{46 dm}^{3}}[/tex]
Which statement correctly compares and contrasts the information represented by the chemical formula and model of a compound? Both show how the atoms in a compound are connected. Models show how the atoms in a compound are connected. Chemical formulas show how the atoms in a compound are connected.
Answer:
Models show how the atoms in a compound are connected.
I just took this instruction so make sure to press that THANKS button!
Final answer:
A chemical formula indicates the types and numbers of atoms in a compound, while a structural formula also shows how atoms are connected. Models, such as ball-and-stick or space-filling, visually represent the geometric arrangement of atoms, with space-filling models showcasing the relative sizes of atoms.
Explanation:
The correct statement that compares and contrasts the information represented by the chemical formula and model of a compound is that both show how the atoms in a compound are connected, but in different ways. A chemical formula, such as the molecular or empirical formula, shows the types and numbers of atoms in a compound but not how they are linked. For more detailed information on atom connectivity, one would look at a structural formula, which includes lines representing bonds between atoms, indicating how atoms are connected in the molecule.
Models of compounds, including stick, ball-and-stick, or space-filling models, provide a visual representation of the arrangement of atoms. A ball-and-stick model displays the geometric arrangement, with sticks representing bonds and balls representing atoms - though not to scale. A space-filling model also represents the three-dimensional arrangement of atoms in a molecule but shows the relative sizes of atoms more accurately than a ball-and-stick model.
What are moles? (Quantitative Chemistry)
Answer:
Moles are the amount of substance containing the same number of chemical units.
Explanation:
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how many moles of oxygen react with 12 moles of aluminum
Answer:
If, for example, we want to know how many moles of oxygen will react with 17.6 mol ... Write the balanced chemical reaction for the combustion of C 5H 12
Explanation:
Which sentence from Holes contains an implied personality trait?
Stanley and his parents had tried to pretend that he was just going away to camp for a while, just like rich kids do.
He'd just been in the wrong place at the wrong time.
Stanley felt somewhat dazed as the guard unlocked his handcuffs and led him off the bus.
Stanley nodded to show he understood
Stanley and his parents had tried to pretend that he was just going away like rich kids do ( A ) is an implied personality trait
Although the excerpt from Holes is missing from your question an answer is provided based on the principle of implied personality trait
An implied personality trait is used to describe the character of a person based on his actions and thought. also implied personality trait are used to make inferences about an individual.
As seen in the sentence " Stanley and his parents had tried to pretend that he was just going away like rich kids do " the inference /conclusion contained in this sentence is that Stanley and his parents are pretending
Hence we can conclude that ; Stanley and his parents had tried to pretend that he was just going away like rich kids do ( A ) is an implied personality trait
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Complete the following statements to describe
solids,
liquids, and gases. Select the correct answer from each drop-down menu.
A solid
a definite volume and
a definite shape.
A liquid
a definite volume and
a definite shape.
A gas
a definite volume and
a definite shape
Answer : The correct option is,
A solid : a definite volume and a definite shape.
Explanation :
As we know that there are 3 states of matter :
Solid state : It is defined as a state in which the particles are closely packed and does not have any space between them. This state have a definite shape and volume. For example : iron metal
Liquid state : It is defined as a state in which the particles are present in random and irregular pattern. The particles are closely arranged but they can move from one place to another. This state have a definite volume but does not have a fixed shape. For example : water
Gaseous state : It is defined as a state in which the particles are loosely arranged and have a lot of space between them. This state have indefinite volume as well as shape. For example : Any type of gas like, helium gas.
Hence, the correct answer is, a solid has a definite volume and a definite shape.
what tool did Maurice use when studying dna???
Answer:
He used the X-ray tool
Explanation:
Answer:
a x ray
Explanation: mark me brainliest plzzz
How has the scientific community addressed the safety of chemicals?
A. Chemicals are repeatedly tested, even those that have existed for
a long time.
B. Existing chemicals are tested if they have never been tested
before.
c. Chemicals are tested if they are suspected to have caused a
problem.
D. Only new chemicals are tested.
Answer:
A
Explanation:
Chemicals are repeatedly tested, even those that have existed for
a long time.
y =‐1x + 7 If y has a value of ‐24 what is the value of x?
Answer:
x = 31
Explanation:
-24 = -1x + 7
subract 7 from both sides.
-31 = -1x
divide both sides by -1
31 = x
What does standard deviation reveal about data?
A. The average of all the data points
B. Which of the data points is most reliable
C. How spread out the data points are
D. The percent error included in the data
Answer:
A. The average of all the data points
Standard deviation is a statistical measure indicating the spread of data points around the mean; a low value signifies data points clustered close to the mean, while a high value indicates more spread out data.
Standard deviation is a statistical measure that reveals how data points in a set are spread out from the dataset's mean. A low standard deviation indicates that the data points are closely clustered around the mean, suggesting little variation. Option C [how data points in a set are spread out]
Conversely, a high standard deviation suggests a wide spread of data points from the mean, indicating greater variation within the dataset. It is important to note that the standard deviation is always a non-negative value; even if all data points are equal leading to a standard deviation of zero, this merely indicates no variability.
When assessing the reliability and variability of data, the standard deviation serves as a vital tool. It helps in understanding the consistency of the data points and in identifying any potential outliers that may influence the overall dataset. Moreover, the concept of standard deviation is valuable for comparing the spread of different datasets and facilitating statistical analysis across various contexts.
Calculate the molarity of the solution.
6.02 x 1022 molecules of HCI (molecular weight = 36.5 g/mole) in 2.0 liters of water
M
Answer:
ans. is 0.05
Explanation:
molarity=(mole of solute)/(litre of solution)
Answer:
The molarity of the solution is 0.05 [tex]\frac{moles}{L}[/tex]
Explanation:
Molarity (M) is the number of moles of solute that are dissolved in a given volume.
Molarity is determined by the following expression:
[tex]Molarity (M)=\frac{number of moles of solute}{dissolution volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Then you should know the amount of moles of HCL. For that you should know that:
The Avogadro Number or Avogadro Constant is called the number of particles that constitute a substance (usually atoms or molecules) and that can be found in the amount of one mole of that substance. Its value is 6.023 * 10²³ particles per mole. Avogadro's number applies to any substance.
Therefore, applying a rule of three, 6.02*10²² molecules correspond to:
[tex]moles=\frac{6.02*10^{22}*1mole }{6.023*10^{23} }[/tex]
moles=0.1 moles of HCl
Applying the definition of molarity:
[tex]M=\frac{0.1 moles}{2 L}[/tex]
M= 0.05 [tex]\frac{moles}{L}[/tex]
The molarity of the solution is 0.05 [tex]\frac{moles}{L}[/tex]
8. What happens to matter during a chemical reaction
Answer: A new substance(product) is made from different elements(reactants) joined by chemical bonds
Explanation: To have a chemical reaction the chemical properties must change. Atoms are never created or destroyed during chemical reaction but at least one chemical bond is broken or formed. Evidence of a chemical change include: change of odor, change of color (for example, silver to reddish-brown when iron rusts), and change in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat.
Which type of graph would best to represent a budget?
Answer:
Line or a bar graph
Explanation:
Answer:
I'm pretty sure it's the pie chart
Explanation:
A chemical company produces ammonia using the following reaction:
N2 + 3H2 → 2NH3
They run a reaction meant to fill an order for a customer who would like to purchase 500.0g of ammonia. When the reaction is complete, the company finds they produced only 430.0g of ammonia. What it their percent yield for that reaction?
70.00%
86.00%
116.3%
93.00%
HELPPP PLEASE
Answer:
[tex]\boxed{\text{ 86.00\,\%}}[/tex]
Explanation:
[tex]\text{\% yield} = \dfrac{\text{actual yield}}{\text {theoretical yield}} \times\text{100 \%}[/tex]
Data:
Actual yield = 430.0 g
Theoretical yield = 500.0 g
Calculation:
[tex]\text{\% yield} = \dfrac{\text{430.0 g}}{\text {500.0 g}} \times\text{100 \%} = \boxed{\text{86.00 \%}}[/tex]
hat is the best way to compare a concentrated solution to a dilute solution, given the same volume of solution?
Answer:
Using the molarity of the solution
Explanation:
The concentration of the two solutions can be compared by the use of the number of moles of solute present in each of the solutions. The solution with a higher molarity will be concentrated while the solution with a lower molarity will be dilute.
To compare concentrated and dilute solutions, one looks at the amount of solute in relation to the solvent for the same volume. Calculation of the new concentration after dilution can use the [tex]M_1 \times V_1 = M_2 \times V_2[/tex] equation, applying to stock solutions to reach desired dilutions.
To compare a concentrated solution to a dilute solution while maintaining the same volume, one should examine the ratio of solute to solvent present in the solution. A concentrated solution has a higher concentration of solute, meaning there is a large amount of solute relative to the solvent.
On the other hand, a dilute solution contains a smaller amount of solute hence a lower concentration. This concept can be analogous to the process of making juice from concentrate; you add water to the concentrated juice, thereby increasing the volume while reducing the solute-to-solvent ratio.
When performing calculations, you can use the dilution equation [tex]M_1 \times V_1 = M_2 \times V_2[/tex], where M represents molarity and V represents volume, to determine the new concentration after dilution. For instance, if you have 100 mL of a 2.0 M HCl and dilute it to 500 mL, you can calculate the new molarity ([tex]M_2[/tex]) by applying this equation.
The methodology of dilution typically involves taking a measured volume of a stock solution and adding solvent to reach the desired concentration. This process of diluting adjusts the ratio of solute to solvent, creating a solution of lesser concentration.
What is the boiling point in degrees Celsius of water
Answer:
100 degree celsius
Explanation:
The _____ the temperature of an object the faster the molecules vibrate.
a. higher
b. lower
The higher the temperature of an object the faster the molecules vibrate.
• Kinetic energy is the energy of the motion, which is equivalent to thermal energy at the smallest scale, that is, heating up and kinetic energy are considered as similar thing.
• With vibrations, the molecules bump into each other, thus, transferring kinetic energy to other molecules that at certain occasions radiate this energy as heat.
• When the environment in which molecules prevails gets heated, the absorption of kinetic energy takes place by the molecules and thus more vibrations takes place.
Thus, it can be said that when the temperature of an object is higher the faster the molecules will vibrate.
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Which of these is the result of scientific research and not engineering?
A. A new shoe design that features air cushioning for more comfort
and protection
B. The creation of glass with UV protection.
C. A conclusion about diet commonalities among diabetics.
D. The development of a smaller, more compact missile.
Answer:C
Explanation: This is because you did research to find the conclusion, but a new object/invention for the other ones.
Answer:
c. a conclusion about diet commonalities among diabetics.
Explanation:
The goal of this experiment was to answer the
question "What is the effect of a gas' temperature
on its volume?" You formulated the hypothesis
below
To test this hypothesis, you changed the
of the gas between 0 and 100°C
(273 and 373 K) and calculated the resulting
of the gas
DONE
Hypothesis: If a fixed amount of gas is
heated, then the volume will increase because
the heat will cause the molecules of gas to
move faster and further apart.
Answer:
hypothesis is correct, if temp increases particle velocity increases, increasing force and number of collisions therefore, volume increases
Explanation:
Final answer:
The experiment tests Charles's law, which states that the volume of a gas increases with temperature when pressure is constant. This was demonstrated by early scientists like Jacques Charles and is due to the increase in kinetic energy of gas molecules at higher temperatures.
Explanation:
The experiment in question aims to understand the effect of a gas's temperature on its volume, which is a principle demonstrated by Charles's law. Via the controlled experiments of heating a fixed amount of gas and measuring its volume at various temperatures while maintaining constant pressure, we see that the volume indeed increases as temperature rises. This concept was first systematically studied by Jacques Charles and further refined by Joseph-Louis Gay-Lussac, who demonstrated that a plot of volume (V) against temperature (T) at constant pressure is a straight line, confirming that these two variables are directly related.
Charles's initial findings indicated that at a constant pressure, the volume of a gas increases with temperature. This is because, as explained by the kinetic molecular theory, increasing temperature results in gas molecules moving with greater kinetic energy, leading to more frequent and forceful collisions with the container walls, thus expanding the volume unless the pressure is increased. These principles underpin our understanding of gas properties and behaviors and are illustrated in historical graphs and datasets, such as methane gas volume-temperature data graphed in scientific studies.