Answer:
Cathode rays are made up of negatively charged particles.
Atoms contain negatively charged particles.
Explanation:
Answer:
B. Cathode rays are made up of negatively charged particles
C. Atoms contain negatively charged particles
Explanation:
Edge 2021
If it takes 38.70cm³ of 1.90 M NaOH to neutralize 10.30cm³ of H2SO4 in a battery, What's the Molarity of the H2SO4 ?
Answer:
Volume of acid Va = 38.70cm3,
Concentration of acid Ca = 1.90M
Volume of Base Vb = 10.30cm3
Concentration of base Cb = ?
Equation of the reaction
H2SO4 + 2NaOH = Na2SO4 + 2H2O
No of mole of acid Na = 1
No of mole of base Nb = 2
CaVa/CbVb = Na/Nb
Cb = CaVaNb/VbNa
Cb = 1.9*38.7*2/10.30*1
Cb = 14.2777M
Explanation:
The molarity of H2SO4 in the question is calculated using the stoichiometry of the neutralization reaction and the definition of molarity, yielding a result of 3.57 M.
Explanation:According to the neutralization reaction, one molecule of H2SO4 reacts with two molecules of NaOH. This gives us a stoichiometric ratio of mol NaOH: mol H2SO4 = 2:1.
The moles of NaOH used in the reaction can be calculated using its molarity and volume: 1.90 mol/L * 38.7*10- 3 L = 0.07353 mol.
This means there were 0.07353/2 = 0.036765 mol H2SO4 in the 10.30cm³ of solution.
The molarity of H2SO4 can then be calculated using its definition (mol/L) as 0.036765 mol / 10.3*10-3 L = 3.57 M
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How many atoms are found in 3.45 g of CO2?
To find the number of atoms in 3.45 g of CO2, we use the concept of moles and Avogadro's number. The number of atoms is approximately 4.71 x 10^22 atoms.
Explanation:To determine the number of atoms in 3.45 g of CO2, we need to use the concept of moles. Firstly, we need to find the molar mass of CO2, which is approximately 44 g/mol. Next, we can use the formula:
No. of moles = mass / molar mass
Substituting the given values, we get:
No. of moles = 3.45 g / 44 g/mol ≈ 0.078 mol
Finally, we can use Avogadro's number, which states that 1 mole of any substance contains 6.022 x 10^23 particles (atoms or molecules):
No. of atoms = No. of moles x Avogadro's number ≈ 0.078 mol x 6.022 x 10^23 atoms/mol ≈ 4.71 x 10^22 atoms
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Which phrases describe all the outer planets' motion? Check all that apply.
no rotation
fast rotation
slow revolution
opposite revolution
north to south rotation
what is a non example of a galaxy?
Answer:
A non example of a galaxy is a star
For each example of a phase change, identify whether heat is absorbed from the surroundings or
released into the surroundings.
A popsicle melts on a hot day.
Rubbing alcohol evaporates from the surface of the skin.
Lava solidifies when it erupts from a volcano.
In case of popsicle and alcohol, heat is absorbed from the surrounding.
In case of lava heat is emitted into the surrounding.
Explanation:Melting of popsicle is just a change of state from solid to liquid. This is the phenomenon which occurs when the popsicle gets the heat from the surrounding and it absorbs the heat, thereby turning into liquid. So it absorbs heat from the surrounding.
The alcohol when spread on the skin evaporates into vapour. This is the phenomenon of evaporation which occurs when alcohol absorbs heat from the surrounding and thereby turning into vapour.
Similarly, when lava solidifies into solid, the change of state occurs. As lava emits heat into the surrounding, the temperature of the lava goes down, thereby changing it into solid. So it emits heat into surrounding.
Explanation:
hope this helps :)
edge 2021
what happened between kl and copper sulphate
Answer:
you mean KI? kI potassium K must be a uppercase.
Explanation:
CuSO4 + KI = CuI + I2 + K2SO4Thats what happened.
CuI is insoluble is water.So Its a precipitation.I2 (iodine) is purple gas...
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Calculate the molarity of a solution containing 50.0g of CaBr2 in a 750.0mL solution?
Answer: 0.33M CaBr2
Explanation: Molarity is expressed in moles of solute over liter solution.
M= n solute / L solution
Solution:
First convert mass of CaBr2 to moles using its molar mass
Ca = 40
Br = 80 x 2 answer is 200 g CaBr2.
50.0g CaBr2 x 1 mole CaBr2 / 200 g CaBr2 = 0.25 moles CaBr2
Next convert mL to L
750.0 mL x 1L / 1000mL
= 0.75 L
Substitute the values for M.
M= 0.25 moles CaBr2/ 0.75 L
= 0.33 M CaBr2
3. Where are the metals and nonmetals located on the periodic table? What are some
properties of each?
Metals are located on the left of the periodic table, and nonmetals are located on the upper right.
Explanation: Metals: Lustrous (shiny)
Good conductors of heat and electricity.
High melting point.
High density (heavy for their size)
Malleable (can be hammered)
Ductile (can be drawn into wires)
Usually solid at room temperature (an exception is mercury)
Opaque as a thin sheet (can't see through metals)
Nonmetals: High ionization energies.
High electronegativities.
Poor thermal conductors.
Poor electrical conductors.
Brittle solids—not malleable or ductile.
Little or no metallic luster.
Gain electrons easily.
Dull, not metallic-shiny, although they may be colorful
Which of the following is a property of a pure substance?
A.) it can be chemically separated If it is a compound.
B.) it’s components can be separated with ease.
C.) it is made up of two or more types of compounds .
D.) The original components retain their individual properties
Answer:
D.) The original components retain their individual properties
Explanation:
A pure substance is a substance of constant chemical composition throughout its mass some of the examples of the pure substances are iron, water, oxygen gas, nitrogen gas etc.
A pure substance can in the form of solid, liquid or gas which have constant property. Two or more pure substances combines together to from a mixture after which is not said to be pure substance
For example the one or more atom of the same element is said to be pure but the molecule of two different elements is not said to be a pure substance as they have different property of both of the elements like H2 and H2O where H2 is a pure substance and H2O is not a pure substance.
The pure shows their individual property if they are not combined with other elements or substance as it will not posses individual property.
The health codes cover all issues, except:
Workers health & safety
Exporting foods
Importing foods
Food service complaints
Answer: The health code covers all issues except Exporting foods
Explanation: Health codes are a set of standards established and enforced by government for health requirements. It is a model for safeguarding public health and ensuring food is unadulterated and honestly presented when offered to the consumer.
Food and Drug Administration is the regulatory body in charge in the USA and their jurisdiction is only limited within the country.
The Code establishes definitions; sets standards for management and personnel, food operations, and equipment and facilities; and provides for food establishment plan review, permit issuance, inspection, employee restriction, and permit suspension.
Health codes address a plethora of public health issues, including measures for workers' health and safety, regulations for importing and exporting foods, and how to handle food service complaints.
Explanation:Health codes cover a vast range of issues and regulations that relate to the health and safety of the public. This includes workers' health and safety, importing and exporting foods, and food service complaints. These codes aim to uphold hygiene, safety, and good practice in the food service industry, which includes ensuring safe practices are being followed by staff members (workers' health & safety), the quality and integrity of foods being exported/imported, as well as addressing customer complaints regarding the service of food.
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A 90 lb person is prescribed a drug in the amount of 50mg/kg body per day to be delivered in 2 doses per day. Each tablet contains 250mg of the medicine. How many tabletes should be given per dose?
Answer:
4 tabletes/dose
Explanation:
mass person = (90 Lb)×(Kg/2.20462 Lb) = 40.823 Kg body
amount of medicine = 50 mg/Kg body.day
frecuency = 2 dose/day
⇒ amount of medicine/day = (50 mg/kg body.day)×(40.823 Kg body) = 2041.168 mg/day
⇒ mg medicine/dose = (20141.168 mg/day)×(day/ 2 dose) = 1020.584 mg medicine/dose
∴ mg medicine/tablet = 250 mg medicine/tablet
⇒ # tabletes/dose = (1020.584 mg medicine/dose)×(tablet/250 mg medicine) = 4.082 tabletes/dose
⇒ # tabletes/dose ≅ 4 tabletes/dose
when NaOH(aq) and MgCl2(aq) are mixed, and NaCl(aq) are produced. write the balanced molecular, total ionic and net ionic equations
The balanced molecular reaction is just made of the species as they appear in the chemical equation, with coefficient on the front so we can have the same number of atoms for each elements at the left and the right of the arrow:
2NaOH(aq) + MgCl₂(aq) → Mg(OH)₂(s) + 2NaCl(aq)
The total ionic equation is made by dissociating the ions of the aqueous species:
2Na⁺ + 2OH⁻ + Mg²⁺ + 2Cl⁻ → Mg(OH)₂(s) + 2Na⁺ + 2Cl⁻
The net ionic equation is made by cancelling out the ions that are found at the right and the left of the arrow:
Mg²⁺ + 2OH⁻ → Mg(OH)₂(s)
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How many squares are on 2 x 2 grid
Answer:
4
because
2*2
= 4
Essentially if each square is worth 1 unit then we can multiply to find how many square there will be in a 2 by 2 grid.
2 * 2 = 4
Best of Luck!
Which of the following is true about chemical bonds?
A.
Chemical bonds can form when valence electrons are transferred or shared between atoms.
B.
Chemical bonds do not involve transferring or sharing of valence electrons between atoms.
C.
Chemical bonds can form only when valence electrons are transferred between atoms.
D.
Chemical bonds can form only when valence electrons are shared between atoms.
Answer: A
Explanation: Chemical bonds can form when there is a transfer or sharing of electrons since there are different kinds of chemical bonding and not all involve the sharing or transfer of electrons, as in interstitial bonding, and some coordination compounds.
Child conception begins with the following three events
Answer:
contraception, birth control and condoms
A food worker had safely cooled a large pot of soup to 70 F (21 C) with two hours. What temperature must the soup Reach in the four hours to be cooled properly
The soup should be cooled down to 41°F or lower in the next four hours after being cooled to 70°F in the first two hours. This two-stage cooling method prevents bacterial growth and keeps food safe for consumption.
Explanation:The question you've asked pertains to safe food storage guidelines, particularly cooling temperatures for prepared foods. After a large pot of soup has been cooled to 70°F within two hours, the U.S. Food and Drug Administration (FDA) recommends that the soup must reach a temperature of 41°F or lower within the next four hours. This second stage of cooling is crucial to prevent the growth of bacteria and to keep the food safe for consumption. This is part of the 'two-stage cooling method', which is recommended for foods like soup to go from their cooked temperature down to a safe refrigerator-storage temperature (40°F or below) within six hours.
This is important to prevent the growth of harmful bacteria such as C. botulinum, which can be present in foods that have not been cooled properly. Keep in mind that after cooling, proper reheating is required to kill any bacteria that may have grown. The minimum reheating temperature usually suggested is 165°F.
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To properly cool and prevent bacterial growth, the pot of soup must be cooled to below 4 degrees C (40 degrees F) within the next four hours after it has been cooled to 70 F (21 C) within two hours.
Explanation:The temperature the soup must reach to be cooled properly is below 4 degrees C (40 degrees F). According to food safety guidelines, perishable foods should not be left at a temperature between 4 and 60 degrees C (40 and 140 degrees F) for more than two hours. Within four hours of beginning the cooling process, the soup should be cooled to refrigerator-safe temperatures to prevent the formation and multiplication of microorganisms, particularly bacteria that thrive in that mid-range temperature 'danger zone'.
Therefore, if the food worker has cooled the soup to 70 F (21 C) within two hours, they must ensure that it reaches the safe refrigeration temperature of 40 degrees F or lower within the next four hours to adhere to proper cooling practices and maintain food safety.
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would you expect to find clear weather or clouds near fargo, north Dakota
Answer clouds
Explanation: because that’s a really common place where clouds are
3. A Covalent bonds form between atoms
of which type of elements?
Answer:
Atoms with high electro negativity
Answer: Nonmetallic elements
Explanation: Covalent bonding happens on two nonmetallic elements in which they exhibit sharing of valence electrons to become octet or stabe
What is diffusion?
A. The mixing of gas molecules due to random motion
B. The force created when gas molecules hit their container
C. The total number of molecules within a volume of gas
D. The space occupied by gas molecules moving around
Answer: The mixing of gas molecules due to random motion (a)
Explanation:
The molecules and the particles of the substances move due to diffusion. It involves the mixing of gas molecules due to random motion. Thus, option A is correct.
What is diffusion?Diffusion is the process of spreading and mixing the particles of the matter from a region of high to lower concentration. The process of diffusion depends on pressure and concentration.
The molecule passes from a higher region of concentration by passing a membrane to a region that has a lower region of the gaseous particles.
The concentration gradient plays an important role in the diffusion and is a random movement that allows the net flow of the particles based on the concentration of the solute.
Therefore, option A. the mixing of molecules due to random motion is diffusion.
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This is a PERCENTAGE COMPOSITION by mass problem.
What is the approximate percent by mass of the water in the hydrated salt?
Select one:
a. 98%
b. 88%
c. 2.5%
d. 12%
Answer:
I think it will be d 12% it will be true
Answer:
12%
Explanation:
Determine the mass of strontium iodate when excess rubidium iodate reacts with 240 grams of strontium nitrate. (stoichiometry)
Answer:
The mass of strontium iodate = 496.07 grams
Explanation:
The balanced equation for the reaction is :
[tex]2RbIO3+Sr(NO_{3})_{2}\rightarrow 2RbNO_{3}+Sr(IO_{3})_{2}[/tex]
Molar mass = mass of substance present in 1 mole of the compound , is called the molar mass.
Here RbIO3 = rubidium iodate
Sr(NO3)2 = strontium nitrate
Sr(IO3)2 = strontium iodate
Molar mass of Sr(NO3)2 = 211.63 g/mol
1 mole Sr(NO3)2 = 211.63 g
Molar mass of Sr(IO3)2 = 437.43 g/mol
1 mole of Sr(IO3)2 = 437.43 g
According to the balanced equation ,
2 mole RbIO3 = 1 mole Sr(NO3)2 = 2 mole RbNO3 = 1 mole Sr(IO3)2
Hence
1 mole of Sr(NO3)2 is producing = 1 mole Sr(IO3)2
211.63 gram of Sr(NO3)2 will produce = 437.43 gram Sr(IO3)2
1 gram of Sr(NO3)2 will produce:
[tex]=\frac{437.43}{211.63}[/tex]
240 grams of Sr(NO3)2 will produce:
[tex]=\frac{437.43}{211.63}\times 240[/tex] grams of Sr(IO3)2
= 496.07 grams of Sr(IO3)2
The mass of strontium iodate = 496.07 grams
Molar mass calculation :
Sr(NO3)2 = Mass of Sr + 2(Mass of N)+ 6(Mass of O)
= 87.62 +2(14)+6(16)
=211.63 gram/mole
What evidence have you discovered to explain the impact of the Moon's tilted orbit on eclipse formation?
The Giant Impact Hypothesis posits that the Moon was formed from the debris from a collision between Earth and a Mars-sized object 4.5 billion years ago, which impacted the Moon's orbit and tilt. This tilt affects the occurrence of eclipses because it prevents the Moon, Earth, and Sun from always aligning perfectly. Without the tilt, there would be an eclipse during every full and new moon phase.
Explanation:The Giant Impact Hypothesis suggests that the Moon was formed from the debris resulting from a collision between the Earth and a Mars-sized object about 4.5 billion years ago. This event is thought to have caused significant effects on the Moon's orbit and its characteristics, including its tilt. This tilt affects the occurrence of eclipses.
During a solar eclipse, the Moon, Earth, and Sun align in a straight line. However, because the Moon's orbit is tilted at about 5 degrees to the Earth's orbit, it does not always cast a shadow on the Earth when it passes between the Earth and the Sun. This is also the case in a lunar eclipse where the Earth is between the Sun and the Moon.
Without this tilt, we would experience a solar and lunar eclipse with every full and new moon phase respectively. Therefore, the Moon's tilted orbit plays a crucial role in the formation of solar and lunar eclipses.
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plzzzz HELPPPP!!!!!!!
Explanation:
one molecule of H2 I think
Explanation:
Seems to me like you have 8H and 2N. You need 3H for every N so 6H total. 8H-6H=2H which is one molecule of H2.
Which substance is the least likely to dissolve in water?
A. Methanol (polar)
B. Methane (gas)
C. Vegetable oil (nonpolar)
D. Table salt (ionic)
Answer:
Vegetable oil
Explanation:
because it is nonpolar object
Why are chemical equations balanced?
Answer:
Chemical equations need to be balanced so that they follow the law of conservation of mass.
Which of the following is and example of a chemical change
Answer:
Baking a cake
Explanation: Baking a cake causes chemical changes, which heat activates the leavening agents such as flour, which produces gas bubbles, causing the cake to rise.
Which of the following is an example of a chemical change?
A. Holding two magnets together
B. Breaking glass
C. Baking a cake
D. Boiling water
Charles's law describes the relationship of the volume and temperature of
gas at a constant mass and pressure. According to this law, what would
happen to the volume of the gas if its temperature decreased from 400 K to
300 K?
O
A. The volume would be 4/3 of its original value.
B. The volume would decrease from 400 mL to 300 mL.
O
C. The volume would increase by 100 mL.
O
D. The volume would be 3/4 of its original value.
Answer:
C it is increasing the amount of 400 to 300 by taking away 100
Final answer:
When the temperature of a gas decreases from 400 K to 300 K according to Charles's law, the volume would decrease proportionally to 3/4 of its original value.
Explanation:
According to Charles's law, which describes the relationship between the volume and temperature of a gas, the volume is directly proportional to its temperature on the Kelvin scale when pressure is constant. This means that if the temperature of the gas decreases, the volume will also decrease proportionally. Thus, if the temperature decreases from 400 K to 300 K, which is a reduction to ⅔ (or 3/4) of the original temperature, the volume will similarly decrease to 3/4 of its original value. Therefore, the correct answer to what would happen to the volume of the gas is:
D. The volume would be 3/4 of its original value.
How many electrons does a Copper atom have?
Answer:
27 electrons
Explanation:
A copper ion with a charge of +2 has 29 protons and 27 electrons. The atomic number of an element is equal to the number of protons in the nucleus of each atom of that element.
Answer:
A Carbon atom has 29 electrons
Explanation: The number of protons of any given element is equal to the number of electrons. In this case there are 29 protons in the Carbon atom, so in return there are 29 electrons.
For the oxidation of glucose (C6H12O6 + 602 + 6H20 + 6CO2), how many moles of
oxygen will it take to consume 6 moles of glucose?
Answer: 36 moles O2
Explanation:
Do stoichiometry between glucose and oxygen using the mole to mole ration found in the balanced equation:
mole to mole ratio:
1 mole C6H12O6 : 6 moles O2
6 moles C6H12O6 X 6 moles O2 / 1 mole C6H12O6
= 36 moles O2
The moles of oxygen required to consume 6 moles of glucose has been 36 moles.
The balanced chemical equation for the oxidation of glucose has been:
[tex]\rm C_6H_1_2O_6\;+\;6\;O_2\;\rightarrow\;6\;H_2O\;+\;6\;CO_2[/tex]
According to the balanced chemical equation, for oxidation of 1 mole of glucose, 6 moles of oxygen has been required.
Computation for the moles of oxygenThe available moles of glucose has been 6.
The moles of oxygen required has been:
[tex]\rm 1\;mol\;glucose=6\;mol\;oxygen\\ 6\;mol\;glucose=6\;\times\;6\;mol\;oxygen\\ 6\;mol\;glucose=36\;mol\;oxygen[/tex]
Thus, the moles of oxygen required to consume 6 moles of glucose has been 36 moles.
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What evidence would you look for that would tell you that stationary object is involved in a contact interaction
Answer:
A change in speed and direction between atleast one of the objects
Explanation:
Final answer:
To find evidence of a stationary object's contact interaction, check for changes in motion, identify contact forces, use collision mechanics and momentum conservation laws to infer interactions, and examine the object's boundary for contact points.
Explanation:
To determine whether a stationary object is involved in a contact interaction, there are several pieces of evidence you can look for. Contact forces must touch or be in contact with an object to cause a change. Some signs of contact interactions include observing a change in an object's state of motion, such as a stationary object starting to move, or a moving object changing direction or speed after an interaction.
Examples of contact forces are normal reaction, friction, tension, and applied forces. For instance, during a collision, two objects exert forces upon each other, and these forces can affect their respective velocities. This interaction conserves momentum if no external forces are acting.
If you cannot directly observe an interaction, you can infer it has occurred by examining the evidence left behind. For example, if you have a scenario where an object of known mass m2 is initially stationary, and after an interaction with another mass m1, you see that m1 has been deflected at a certain angle with a specific speed, you can use conservation of momentum and kinematics to deduce the magnitude and direction of mass m2's velocity post-collision.
Another way to identify contact interactions is by making a drawing of the object and drawing a dashed boundary line around it that separates it from its environment. By examining points on this boundary line, you can identify where other objects might have come into contact with it, indicative of contact forces. Additionally, checking for the presence of a normal force or frictional force will also suggest a contact interaction has occurred.