Answer:
I think you're supposed to answer that yourself because it's asking your personal opinion. I'd personally like to know in advance
The diagram below shows a helium atom and its
corresponding symbol.
Symbol: 4
HE
2
What does the top number in the symbol tell you
about the atom?
This is the mass number A. It shows the number of nucleons (neutrons and protons in the nucleus). It is made up of the atomic number Z and the neutron number N:
A = Z + N
Using the example of helium:
Helium has a mass number A of 4 and the atomic number Z 2, so the atom has 2 neutrons in its nucleus.
A = Z + N
4 = 2 + 2
The two containers are mathematically similar in shape
A quantity of gas has a volume of 250 L, at 290 K and 303.98 kPa of pressure. What volume must the gas be for the gas to be at 273 K and at 101.33 kPa?
The new volume of the gas at a temperature of 273 K and at pressure of 101.33 KPa is 706.01 L
Data obtained from the question Initial volume (V₁) = 250 LInitial temperature (T₁) = 290 KInitial pressure (P₁) = 303.98 KPaNew temperature (T₂) = 273 KNew pressure (P₂) = 101.33 KPaNew Volume (V₂) =? How to determine the new volumeThe new volume of the gas can be obtained by using the combined gas equation as illustrated below:
P₁V₁ / T₁ = P₂V₂ / T₂
(303.98 × 250) / 290 = (101.33 × V₂) / 273
Cross multiply
290 × 101.33 × V₂ = 303.98 × 250 × 273
Divide both side by 290 × 101.33
V₂ = (303.98 × 250 × 273) / (290 × 101.33)
V₂ = 706.01 L
Learn more about gas laws:
https://brainly.com/question/6844441
1. How does Mr. Ravenell describe the essence of the black barbershop? Why
considered a safe haven?
2. What health topics were often discussed in the barbershop?
3. Why does Denny Moe say that a lot of black men trust their barbers more than their doctors?
4. How has Mr. Ravenell's work combined healthcare and barbershops?
5. What are the benefits of training barbers to talk to their clients about health issues and help with their healthcare?
This exercise is from Barbershop can keep men healthy by Joseph Ravenell, and is related to High Blood Pressure.
How does Mr. Ravenell describe the essence of the black barbershop?Mr. Ravenell describes the essence of the black barbershop as a place where there is friendship, trust and cooperation, and peace. (1a)
He considers it a safe haven because is void of stress and societal threats. (1b)
What health topics were often discussed in the barbershop?Some of the health-related topics that were discussed in the barbershop include but are not limited to:
Denny states that black men trust their barbers more than their doctors because most of them relate more with their barbers than with their doctors.
How has Mr. Ravenell's work combined healthcare and barbershops?Mr. Ravenell taught barbers how to measure blood pressure, and how to counsel their customers to go see a doctor if their blood pressure was too high.
What are the benefits of training barbers to talk to their clients about health issues and help with their healthcare?It was discovered that the number of those whose blood pressure were controlled in the 18 shops that were studied for one year were higher in the shops where the barbers had been trained.
Learn more about High Blood Pressure at:
https://brainly.com/question/7603423
WILL GIVE BRAINLIEST AND POINTS
What is a synonym and antonym for Magnetic Field Line?
What is a synonym and antonym for Magnetic Pole?
Answer:
Magnetic field and Magnetic Pole
Explanation:
Synomyns for magnetic field is magnetic flux.
Synonyms for magnetic pole is magnetic rod
Antonyms for magnetic field is magnetic pole
Antonyms for magnetic pole is magnetic voltaic cell
Physician Barry Marshall infected which test subject to investigate the role of Helicobacter pylori in peptic ulcers?
Cats
Dogs
Guinea pigs
Himself
None of the above
What are two costs of using tides for energy?
Answer:
Answer: According to 2019 figures from the US Department of Energy, the average commercial tidal energy project costs as much as $280 per megawatt hour. Wind energy, by comparison, currently costs roughly $20 per megawatt hour and is "one of the lowest-priced energy sources available today," according to the agency.
Explanation:
Answer:
The two cost of using tides for energy is solor and wind.
How does rapidly increasing volume of the gas without a change in the moles or temperature affect the pressure in a gas container
Answer:
pressure decreases
Explanation:
increasing volume means increase the room
imagine tennis balls bouncing around in a room
if the size of the room increases the tennis balls hit the walls less often
ohemfsuedu
Which of Dalton's postulates required revision?
Answer:
Dalton's 5 postulates
All matter consists of indivisible particles called atoms.
Atoms of the same element are similar in shape and mass, but differ from the atoms of other elements.
Atoms cannot be created or destroyed.
Atoms of different elements may combine with each other in a fixed, simple, whole number ratios to form compound atoms.
Explanation:
NEED HELP ASAP
During an experiment, ice and water were placed in a perfectly insulated thermos flask at 0 °C. Describe this system when it phase reaches equilibrium.
By the time thermal equilibrium is attained in the system, ice is completely converted to water.
What is tehrmal equilibrium?Thermal equilibrium is a situation in which two substances are exactly at the same temperature. That is. Heat is no longer flowing beween the bodies.
Recall that an insulated thermos flask implies that heat does not eneter or leave the system. Heat will flow from the water to the ice untill the both attains the same temperature and the ice is completely converted to water.
Learn more about thermal equilibrium: https://brainly.com/question/2637015
Which of the following is a characteristic of a strong base
What is a titration procedure used for?
Question 2 options:
Titrations identify how toxic a solution is.
Titrations test the pH level of an unknown solution by using a known solution.
Titrations determine if a combination of chemicals will react.
Titrations test the pH level of an unknown solution by using a known solution.
What is titration?A titration is a method in which a solution of known concentration is used to find out the concentration of an unknown solution. The titrant which is a known solution is added from a buret to the unknown solution until the reaction is complete.
So we can conclude that titrations test the pH level of an unknown solution by using a known solution.
Learn more about titration here: https://brainly.com/question/186765
help this question im kinda stuck on
Answer:
Explanation:
i think it is the last one. hope it is correct
PLEASE HELP!!!!!!!!!!!!!!!!!!!
Answer: nervous tissue to allow heart
epithelial to transmits
connective to forms like
muscle tissue to support bone
Explanation:
king_n1886
Ice cubes are placed on a table in a warm room. What happens to the ice particles?
1. The particles become larger.
2. The particles move faster.
3. The particles change color.
4. The colors change shape.
B
Explanation:
I rember when I learned this in 3rd grade
Please help me I have a lot of points
Answer: Five moles of CH4 would require ten moles of O2.
Explanation: Start with a balanced equation. You can see from the balanced equation that one mole of CH4 reacts completely with two moles of O2. So five moles of CH4 would require ten moles of O2.
Which is heavier, 0.5 moles of Mg or 5 moles of H2?
Answer:
hydrogen
Explanation:
b/c H= 5×2=10
Mg=0.5×1 =1
Heat transfer through direct contact between molecules
Answer:
This is an example of a form of energy transferring itself. Tons of electrons are passed through the energy itself to you very quickly. That's why when we touch a hot surface and get burned, it's because our skin molecules are touching the heat molecules.
What are some characteristics of Tundra Biomes ?
Answer:
Characteristics of tundra include:
Extremely cold climate.
Low biotic diversity.
Simple vegetation structure.
Limitation of drainage.
Short season of growth and reproduction.
Energy and nutrients in the form of dead organic material.
Large population oscillations.
Explanation:
The unit of area is derived unit why
Answer:
A derived unit is gained by adding two or more base quantities and in this case area is obtained by adding two more base quantities.
Quantity :Area = length(base quantity) × breadth(base quantity)
Derived unit of area = m(SI base unit ) × m(SI base unit) = m²
chemistry balance equations C2H +O2=CO2+H2O
Invalid equation.
..............
Why is potassium nitrate classified as an electrolyte?.
Answer: It is a molecular compound. (2) It contains a metal. (3) It can conduct electricity as a solid.
The percent yield of a chemical reaction is valuable to many industries. Low percent yields can result in the loss of large amounts of money. Which of the following would likely increase the percent yield of a reaction? Check all that apply. Using accurate measurements using pure chemicals performing the reaction under the most ideal conditions adding water to the experiment.
Using accurate measurements, using pure chemicals and performing the reaction under the most ideal conditions is important to get a valuable percent yield.
How we calculate the percent yield?Percent yield of any chemical reaction is define as the ratios of the actual yield to the theoretical yield of the product and multiply by the 100.
To get the high percent yield or actual yield of any reaction, we have to perform the reaction under ideal condition because if we not use the standard condition then we get the low rate of reaction. Reactants should be present in the pure form as impurity make unwanted products and reduce the productivity of main product and accurate amount of reactants also important for the spontaneous reaction.
Hence, options (a), (b) & (c) are correct.
To know more about percent yield, visit the below link:
https://brainly.com/question/8638404
How many kiloliters are in 602,000,000 microliters?
Answer:
0.602
Explanation:
is your answer good sir
Answer:
The correct answer is 0.602 .Mark BRAINLIEST
Thank you ☺️☺️
The wool in a sweater is the result of a physical change? true or false
Answer:
false
Explanation:
still wool. the sweater is wool
Answer:
yes it is
Explanation:
Using the table below, provide a reason as to why the energy needed to heat the
Sample A is significantly less than Sample B.
Mass of
Water
Change
in Temp.
Energy
Needed
Sample A 50 grams
15 °C
3138
joules
Sample B 50 grams
15 °C
19788
joules
Answer:
Explanation:
Both Sample A and B have the same mass (5g) and same temperature change (15°C). What is not said and may explain the difference in energy needed are their initial states and temperature.
For example Sample B may be liquid water at 90°C. Heating it up to 105°C will require additional energy to go from liquid to gas state. If Sample A is water vapor at 105°C at first, it has a lower specific heat and heating it up to 120°C does not involve a state change. So the eneregy needed is less.
GUYS HELPP
Convert the following number of moles of the chemical into its corresponding mass in grams
1. 2.360 moles of lead (II) oxide
Convert the following masses into their corresponding number of moles.
2. 23.5 g of sodium chloride
3. 0.778 g of sodium cyanide
Convert the following number of moles into their corresponding number of particles.
4. 0.0455 moles of hydrochloric acid
[tex]mass = number \: of \: moles \times molar \: mass[/tex]
1)[tex]m = 2.36(223.2) = 526.752 \: grams[/tex]
2)[tex]n = \frac{mass}{molar \: mass} = \frac{23.5}{58.4} = 0.40239 \: moles[/tex]
3)[tex]n = \frac{0.778}{49} = 0.0158775 \: moles[/tex]
4)[tex]n = \frac{number \: of \: particles}{avogadros \: constant} [/tex]
[tex]n \: o \: p = 0.0455 \times 6.02 \times 10 {}^{23} = 2.7391 \times 10 {}^{22} particles[/tex]
Mass in grams of 2.360 moles of lead (II) oxide is 0.0105.
What is mole concept?Avogadro's number is the number of units in one mole of any substance and equals to 6.02214076 × 10²³. The units can be electrons, atoms, ions, or molecules.
No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.
Mass of a particular product is also find out by stoichiometry of a reaction as per the no. of mole given in the reaction.
Given, No. of moles of lead oxide = 2.360 grams
No. of moles = Mass of compound ÷ Molar mass of compound
No. of moles = 2.36 ÷ 223.2
No. of moles = 0.0105
Therefore, Mass in grams of 2.360 moles of lead (II) oxide is 0.0105.
Learn more about mole concept, here:
https://brainly.com/question/31123980
#SPJ2
Wood is mainly cellulose, a polymer produced by plants. One use of wood is as a fuel in campfires, fireplaces, and wood furnaces. The molecules of cellulose are tong chains of repeating units. Each unit of the chain can be represented as C.HOs. The balanced equation below represents a reaction that occurs when C.HOs is burned in air.
C6H1005 + 0₂ → CO₂ + H₂O + heat
5. Balance the chemical equation using the smallest whole number coefficient.
Answer:
C6 H10 O5+ 6O2-----> 6CO2+5H2O+heat
Explanation:
There are 6 carbon atoms in reactants to balance you put coefficient 6.
This makes the oxygen in CO2 12 so to balance put 6 in oxygen in reactants.
There are 10 hydrogen atoms in reactants to balance you put 5 in front of H2O in products.
If u recheck: 6 C atoms in reactants, 6 C atoms in products.
10 H atoms in reactants, 10 H atoms in products.
17 O atoms in reactants, 17 O atoms in products.
60 points and brainliest! please help me i will appreciate it!
what is found on the orbitals outside of the nucleus
Answer:electrons
Explanation: