Answer:
56.2÷6.02×10^23
=9.34×10^23
Explanation:
Divide the given mass of the atom by the mass of an Atom (the avogadro's constant) to find the number of atoms in the given mass.
6. List two (2) ethical issues that the healthcare provider has a public duty to report.
Answer: Communicable diseases, abuse gunshot wounds and forensic medicine
Explanation:
Heat is the measure of the average kinetic energy of particles; temperature is the measure of the transfer of thermal energy .
true or false
What is the molar concentration (molarity) of 1.0 mol of KCl dissolved in 750 mL of
solution?
Answer:
Molarity is moles per liter. You have one mole in 0.750 liters
Explanation:
You are given a 1.55 g mixture of calcium nitrate and calcium chloride. You dissolve this mixture in 20 mL of water and add an excess of 0.300 M silver nitrate. You collect and dry the resulting precipitate and determine it has a mass of 0.535 grams. Calculate the percent calcium chloride in the original mixture.
Answer:
13.4 (w/w)% of CaCl₂ in the mixture
Explanation:
All the Cl⁻ that comes from CaCl₂ (Calcium chloride) will be precipitate in presence of AgNO₃ as AgCl.
To solve this problem we must find the moles of AgCl = Moles of Cl⁻. As 2 moles of Cl⁻ are in 1 mole of CaCl₂ we can find the moles of CaCl₂ and its mass in order to find mass percent of calcium chloride in the original mixture.
Moles AgCl - Molar mass: 143.32g/mol -:
0.535g * (1mol / 143.32g) = 3.733x10⁻³ moles AgCl = Moles Cl⁻
Moles CaCl₂:
3.733x10⁻³ moles Cl⁻ * (1mol CaCl₂ / 2mol Cl⁻) = 1.866x10⁻³ moles CaCl₂
Mass CaCl₂ -Molar mass: 110.98g/mol-:
1.866x10⁻³ moles CaCl₂ * (110.98g/mol) = 0.207g of CaCl₂ in the mixture
That means mass percent of CaCl₂ is:
0.207g CaCl₂ / 1.55g * 100 =
13.4 (w/w)% of CaCl₂ in the mixture!!MARKING BRAINLIEST!! Please help this is due at midnight!! No websites please just help me! :(
Answer:
I'll do the first one for you. The reason why I'm not going to do the rest is because this is pretty simple stuff. I'll explain how I got the answer, please read it ^^ the rest of the problems should be a breeze.
1. 5.454285714285714 liters, or approx. 5.45 liters
Explanation:
P1V2 = P2V2
P1 refers to the original pressure. V1 refers to the original volume, or the amount of space the gas takes up.
P2 and V2 refer to the final pressure or volume, accordingly.
You insert the values into the equation, like so:
(8.3)(46) = (70)(x)
Now, multiply.
381.8 = 70x
Use inverse operations to find the value of x. Divide 381.8 by 70 to isolate x.
381.8/70 = x
5.454285714285714 = x
The volume of the gas when the pressure is increased to 70.0 mm Hg is approximately 5.45 liters. Don't forget about the units at the end, when you write your final answer.
Important! When pressure increases, volume decreases, and vice versa. Volume and pressure for gases are inversely proportional. So even though the pressure increased, that doesn't mean the volume increases, too.
You can check your answers easily!
Just multiply your final answer by its corresponding pressure or volume and compare it to the other. I hope that made sense. Like so:
5.454285714285714 x 70 = 381.8
8.3 x 46 = 381.8
That makes P1V2 DOES equal P2V2, and your answer is correct.
I hope this helped in time for you to submit it before the deadline! Good luck.
Tips!
For #2: I'm pretty sure the mentioning of the temperature (25.0 °C) doesn't matter. You can ignore it, it won't affect your calculations.
For #4: the standard pressure in mm Hg (millimeters of mercury) is 760 mm Hg. That's your P2.
Which traits do you think are passed down from alien parents to their offspring, and which traits are not? Explain.
Answer:
things like hair color, eye color, skin color, size of lips, curly or straight hair, are things that could be passed down to an offspring. Things like tattoos wont be passed down.
Explanation:
things like hair color, eye color, etc. get passed down because those are inheritable traits and things like tattoo aren't.
A drought hits the habitat of a semi-aquatic bird population. All ponds dry up, and fish populations decline. There are two groups of birds in the population that differ in leg length and diet. Long-legged birds eat fish, while short-legged birds eat insects. The drought has little effect on insect populations.
Answer:
The population of the long-legged birds decreases.
Explanation:
The population of the short-legged birds increases whereas the population of long-legged birds decreases due to availability of food in that environment. The long-legged birds feed on fish whose population decreases due to drought conditions so the population of long-legged birds also decreases while on the other hand, the population of short-legged birds increases or remain the same because they feed on the insects and the insects are available in large amount and less affected by the drought conditions.
____________ are traits characteristics or features of an organism that are passed from parent to offspring
Answer:
Heredity, also called inheritance or biological inheritance, is the passing on of traits from parents to their offspring; either through asexual reproduction or sexual reproduction, the offspring cells or organisms acquire the genetic information of their parents.
Explanation:
Plss markk mee brainlistt
A rod, X has a positive charge of 8. An otherwise identical rod, Y has a negative charge of 4. The rods are touched together, and then separated.
1.When they touch, what particles move between them?
2.Did the particles move from "X" or "Y" or from "Y" to "X"?
Answer:
1. electrons
2. From "Y" to "X"
Explanation:
1. Electrons move between the rod since the electrons are the only charge carriers which are free to move.
2. The particles move from from "Y" to "X" since the electrons are the only charge carriers which are free to move. The positive charge on rod x is due to a deficit of electrons while the negative charge on rod Y is due to the excess of electrons. When the rods come together, the electrons move from "Y" to "X" since the electrons are the only charge carriers which are free to move.
I need help on this question
Answer:
I only
last answer
Explanation:
Baby oil is _?_ and will not mix with water.
What makes sound waves different from light waves?
Answer:
Light waves are electromagnetic waves while sound waves are mechanical waves. light waves are transverse while sound waves are longitudinal. sound waves require a material medium to travel, and hence, cannot travel in a vacuum. the speed of light in a medium is constant.
Explanation:
Hope this helped Mark BRAINLIEST!!
Use the drop-down menu to complete the statement. This is why they have similar Atoms of elements in the same group have the same number of chemical properties.
Answer:
valence electrons
Explanation:
i just took the test
How is thermal energy transferred between two objects that are at different temperatures?
Group of answer choices
Heat flows from the object that has more thermal energy to the object with less thermal energy.
The object at a lower temperature pulls heat from the warmer object.
Heat flows from the warmer object to the cooler object until they reach the same temperature.
Heat flows back and forth between the two objects untl they reach the same temperature.
Answer:
heat flows from the object that has more thermal more energy to the object with less thermal energy
The concentration of sugar in Coke is approximately 10%, or 100 ppt. If you drink
a single can of coke, which holds 355 ml, how much sugar have you consumed?
Answer:
35.5g of sugar
Explanation:
To solve this question we must assume the density of coke = Density of water = 1g/mL
Thus, in a single can of coke, the mass is 355g. Now, the 10% of this coke is sugar. That means the amount of sugar you are consuming is:
355g * (10/100) = 35.5g of sugar
10/100 = 10%
(Please help 15 points the assignment is late) (multiple questions) (everything is virtual task )
Part 1 What do you think will happen when an effervescent tablet is placed in the water under each inverted glass?
Part 2 Note the changes in the water level and the air space in both glasses, and write down your observations.
Part 3 Did your prediction match your observation?
Part 4. When a substance easily dissolves in a liquid, it has high solubility in that liquid. When a substance does not easily dissolve in a liquid, it has low solubility in that liquid. Solubility of a gas in water describes how well the liquid can “hang on” to gas, instead of releasing it into the air. Based on the results of your experiment, do you think that CO2 has a higher solubility in hot water or cold water? Why?
Part 5 Soda pop is carbonated with CO2. Mark puts one bottle of soda pop in the refrigerator and leaves the other out in the hot sunlight. After one hour, he opens both bottles. Which bottle will likely have more fizzing and bubbles? Why?
Part 6 One result of climate change is that ocean temperatures are increasing. If the temperatures continue to rise, what effect will that have on the oceans’ ability to retain CO2? How might this change affect the atmosphere?
The dissolution of gases in water is exothermic therefore oceans will dissolve less CO2 as their temperatures rise.
What is effervescence?
The term effervescence refers to the rise of a gas in a system or simply put, it is the evolution of gas. When an effervescent tablet is placed in the water under each inverted glass, a gas will rise in each glass.
The air space in the hot glass is greater than the air space in the cold glass We can see that the gas has a lower solubility in hot water than in cold water. This is because, solubility of gases is exothermic.
The bottle that is left in the hot sun will have more fizzing because the CO2 does not dissolve owing to the higher temperature.
The rise in ocean temperature means that the oceans will dissolve less CO2 in the future and reduce the CO2 holding capacity of the oceans.
Learn more about CO2: https://brainly.com/question/867804?
Which of the following statements are true about a strong base and a weak base at a pH of 11?
A. The weak base will require less HCl to bring the pH to 7 than the strong base.
B. The strong base will require less HCl to bring the pH to 7 than the weak base.
C. Both bases require the same amount of HCl to reach pH 7 because they are both at the same initial pH.
D. HCl will not bring the pH of either solution to pH 7.
Answer:
A, C, D
Explanation:
Write a balanced equation for the reaction between chromium metal and hydrochloric acid to form chromium(III) chloride
and a reactive gas.
Answer: Cr(s) + HCl(aq) ⇒ CrCl3 (aq) + H2(g)
Explanation:
1. Which graph represents the endothermic reaction?
2. Which graph represents the exothermic reaction?
Could someone please care to explain what the answer is
Calculate the percentage composition of Ca(MnO4)2.
Firstly, we see how many atoms are there for each element in the formula.
Ca= 1 atom
Mn= 2 atoms
O= 8 atoms
Next, we are going to consult our periodic table for the atomic mass of each element.
Ca= 40
Mn= 55
O= 16
Then, we have to find the molar mass for the compound..
Here is the formula for calculating molar mass of an element:
Molar Mass= ( no. of atoms of the element × atomic mass of the element)
Now, we have to calculate the atomic mass of the compound. So using the molar mass formula for an element, we calculate the molar mass for each element then we sum up their molar masses to get the compounds molar mass.
Molar mass (Ca)= 1× 40
(Ca)= 40
Molar mass (Mn)=2×55
(Mn)= 110
Molar mass (O)= 8×16
(O)= 128
Now: Molar mass( compound)= (Ca)+(Mn)+(O)
= 40+ 110 128
= 278
This is everything we need to calculate our percentage composition for each element..
* The example says to find the percentage composition for Ca. So we only find for Ca, Which is already done using the formula and the answer is 14.39%.
To prove that your answer is correct, find the percentage composition for Mn and O as well. Then you add up their percentage compositions.
If you do and you get 100 as your answer, then your percentage compositions are correct.
Why don't you try finding the percentage composition for Mn and O, then add up all the three percentage compositions. If you 100 as their sum, then your percentage composition for each of the elements are correct.
Determine the pH, pOH, [H+], and [OH−] of a solution in which 0.300 g of aluminum hydroxide is dissolved in 184 mL of solution.
Answer:
[OH⁻] = 0.0627M
pOH = 1.20
pH = 12.8
[H⁺] = 1.59x10⁻¹³M
Explanation:
To solve this question we must, as first, find the molarity of Al(OH)₃ in the solution -Molar mass Al(OH)₃: 78.00g/mol-:
0.300g * (1mol/ 78.00g) = 3.846x10⁻³ moles
In 184mL = 0.184L:
3.846x10⁻³ moles / 0.184L = 0.0209M Al(OH)₃. Three times this molarity = [OH⁻]:
[OH⁻] = 0.0209M * 3
[OH⁻] = 0.0627MpOH = -log [OH⁻] =
pOH = 1.20pH = 14 - pOH
pH = 12.8And [H⁺] = 10^-pH
[H⁺] = 1.59x10⁻¹³MWhat is Chemical bond ?
Answer:
Chemical bonding, any of the interactions that account for the association of atoms into molecules, ions, crystals, and other stable species that make up the familiar substances of the everyday world.
Explanation:
Have a nice day:)
Answer: A connection between two surfaces or objects that have been joined together, especially by means of an adhesive substance, heat, or pressure.
Explanation: The bond may result from the electrostatic force or attraction between oppositely charged icons as in iconic bonds or through the sharing of electrons as in covalent bonds.
what is the atomic weight of Na?
Answer:
22.989769 u
Explanation:
The atomic weight of any atom can be found by multiplying the abundance of an isotope of an element by the atomic mass of the element and then adding the results together. This equation can be used with elements with two or more isotopes: Carbon-12: 0.9889 x 12.0000 = 11.8668. Carbon-13: 0.0111 x 13.0034 = 0.1443.
calculate how many Liters of 0.50 M silver nitrate solution you will need to provide the 2.4x10^-3 moles of silver nitrate
Answer:
4.8x10⁻³ Liters are required
Explanation:
Molarity is an unit of concentration in chemistry defined as the ratio between moles of solute (In this case, silver nitrate) and liters of solution.
The 0.50M solution contains 0.50 moles of silver nitrate per liter of solution.
To provide 2.4x10⁻³ moles Silver nitrate are required:
2.4x10⁻³ moles * (1L / 0.50 moles) =
4.8x10⁻³ Liters are requiredCould someone please care to explain what this is please
Answer:
cierra los ojos que me vengo o me vengo
Explanation:
cierra los ojos que me vengo o me vengo cierra los ojos que me vengo o me vengo cierra los ojos que me vengo o me vengcierra los ojos que me vengo o me vengoo
How are bones important to the lymphatic system?
Do bananas have seeds?
Answer:
no they dont
Explanation:
Which statement correctly describes extreme weather?
O A. Extreme weather events follow normal climate patterns.
o O B. Extreme weather events are random occurrences.
O C. Extreme weather events started with global warming.
O D. Extreme weather events are unpredictable until they strike.
Answer: A
Explanation:
Extreme weather events follow normal climate patterns.
Brainliest and a free hug :) thank you!!
The mass in a chemical reaction is found in
the energy produced by the reaction
the explosion produced by the chemical reaction
the atoms involved in the chemical reaction
the bonds involved in the chemical reaction
Answer:atoms involved in reaction. Mass remains same in reaction
Explanation: hug would be fine!
Deep & Thought Provoking Questions to Ask Yourself (& Others)
When was the last time you tried something new? ...
Who do you sometimes compare yourself to? ...
What's the most sensible thing you've ever heard someone say? ...
What gets you excited about life? ...
What life lesson did you learn the hard way?
Answer:
Am I supposed to answer these on brainly?
Explanation: