Answer:
The mass number is the sum of protons and neutrons. This means to find the number of neutrons you subtract the number of protons from the mass number. On the periodic table, the atomic number is the number of protons, and the atomic mass is the mass number.
Explanation:
Answer:
Use the equation N=M-n
Explanation:
N=neuron
M=atomic mass
n=atomic munber
What volume, in mL, of carbon dioxide gas is produced at STP by the decomposition of 0.242 g calcium carbonate (the products are solid calcium oxide and carbon dioxide gas). Report your answer to 4 sig figs
Answer:
54.21 mL.
Explanation:
We'll begin by calculating the number of mole in 0.242 g calcium carbonate, CaCO3.
This is illustrated below:
Mass of CaCO3 = 0.242 g
Molar mass of CaCO3 = 40 + 12 +(16x3) = 40+ 12 + 48 = 100 g/mol
Mole of CaCO3 =?
Mole = mass /Molar mass
Mole of CaCO3 = 0.242/100
Mole of CaCO3 = 2.42×10¯³ mole.
Next, we shall write the balanced equation for the reaction. This is given below:
CaCO3 —> CaO + CO2
From the balanced equation above,
1 mole of CaCO3 decomposed to produce 1 mole CaO and 1 mole of CO2.
Next, we shall determine the number of mole of CO2 produced from the reaction.
This can be obtained as follow:
From the balanced equation above,
1 mole of CaCO3 decomposed to produce 1 mole of CO2.
Therefore,
2.42×10¯³ mole of CaCO3 will also decompose to produce 2.42×10¯³ mole of CO2.
Therefore, 2.42×10¯³ mole of CO2 were obtained from the reaction.
Finally, we shall determine volume occupied by 2.42×10¯³ mole of CO2.
This can be obtained as follow:
1 mole of CO2 occupies 22400 mL at STP.
Therefore, 2.42×10¯³ mole of CO2 will occupy = 2.42×10¯³ x 22400 = 54.21 mL
Therefore, 54.21 mL of CO2 were obtained from the reaction.
Help :(
Convert 539 dag/dm3 to cg/mm3.
Answer: 5390 cg/mm³.
Explanation:
To convert: 539 dag/dm³ to cg/mm³.
Since 1 dag = 1000 cg ( where dag= Dekagram and cg = Centrigram)
and 1 dm = 100 mm (where dm = decimetre , mm= millimetre)
Then,
[tex]539\text{ dag/dm}^3=\dfrac{539\times1000}{100}\text{ cg/mm}^3\\\\=5390\text{ cg/mm}^3[/tex]
Hence, 539 dag/dm³ = 5390 cg/mm³.
The half-life of radium-226 is 1590 years. if a sample contains 100 mg, how many mg will remain after 1000 years?
Answer:
64.52 mg.
Explanation:
The following data were obtained from the question:
Half life (t½) = 1590 years
Initial amount (N₀) = 100 mg
Time (t) = 1000 years.
Final amount (N) =.?
Next, we shall determine the rate constant (K).
This is illustrated below:
Half life (t½) = 1590 years
Rate/decay constant (K) =?
K = 0.693 / t½
K = 0.693/1590
K = 4.36×10¯⁴ / year.
Finally, we shall determine the amount that will remain after 1000 years as follow:
Half life (t½) = 1590 years
Initial amount (N₀) = 100 mg
Time (t) = 1000 years.
Rate constant = 4.36×10¯⁴ / year.
Final amount (N) =.?
Log (N₀/N) = kt/2.3
Log (100/N) = 4.36×10¯⁴ × 1000/2.3
Log (100/N) = 0.436/2.3
Log (100/N) = 0.1896
Take the antilog
100/N = antilog (0.1896)
100/N = 1.55
Cross multiply
N x 1.55 = 100
Divide both side by 1.55
N = 100/1.55
N = 64.52 mg
Therefore, the amount that remained after 1000 years is 64.52 mg
A cylinder container is filled with air. Its radius is 6.00 cm and
its height is 3.50 cm. What is the volume of air inside? (Use 3.14
for it)
Answer:
395.84cm³
Explanation:
V= π r² h
V= 3.14 6² 3.5
V= 3.14 36 3.5
V= 395.84
The volume of the air inside the cylinder is 395.64 cubic centimeters.
Given:
A cylinder container is filled with air. Its radius is 6.00 cm and its height is 3.50 cm.
To find:
The volume of the air inside the cylinder.
Solution:
The radius of cylinder = r = 6.00 cm
The height of the cylinder = h = 3.50 cm
The volume of the cylinder = V
The volume of the cylinder is given :
[tex]V=\pi r^2 h\\\\V=3.14\times (6.00 cm)^2\times 3.50 cm\\\\V=395.64 cm^3[/tex]
The volume of the air in cylinder = V = [tex]395.64 cm^3[/tex]
The volume of the air inside the cylinder is 395.64 cubic centimeters.
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what do you understand by Project of National Pride
Answer:
National Pride Projects are a set of infrastructure projects by the government of Nepal based on the proposal by the National Planning Commission.
what property of the wood would you need to know to predict how fast the wood would start to burn?
Answer:
The chemical property of combustion.
Explanation:
Combustion is a chemical reaction that occurs between a combustible material, a substance that causes or favors the combustion of other substances that is oxidizer and oxygen, all this accompanied by outgoing energy in the form of heat (exothermic energy) and incandescent energy.
In this case, wood is the combustible material, and combustion is generated by separate energy, fire, phosphors, sparks.
We have that There is no particular property of wood that allows us to predict is combustion
There is no particular property of wood that allows us to predict is combustion but this is what can be said.
Wood combustion is dependent on so may variable e,g
WeatherTemperatureHumidityBut Wood of small size tends to ignite faster than those with larger density
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How do scientists determine the energy and frequency of photons?
Answer:
We can calculate the energy of a photon in two ways. If you already know the frequency, f, of the photon in Hz, then use E = hf. Another form of Planck's equation uses the simple relationship that c = λ f, where λ is the wavelength of the photon
hope this helped good luck!
Answer:
Explanation:
the energy of photon can be determined by the formula that is
E=hf where h is plancks constant and its value is 6.63*10^-34 j.s and f is the frequency of photon to find out the frequency we have to divide the energy of photon by plancks constant
f=E/h
How many moles are in 1 gram of potassium chloride
0.0134 moles.
Explanation:
We will use conversion factors to solve this problem.
Potassium chloride has the chemical formula KCl.
1 gram of KCl is written on the left side of the conversion factor equation.
KCl has a molar mass of 74.5513 g/mol. This is found by adding together the atomic mass of each element. This means that 1 mole of KCl = 74.5513 grams
The conversion factor will look like this. To solve the equation we start with what is on the left, 1 gram. 1 is multiplied by the number in the numerator, and divided by the number in the denominator. When 1 is divided by 74.5513 it equals .0134. The unit grams cancel giving us our final answer in moles.
I hope this satisfied your request. Feel free to ask any questions. I apologize, my handwriting is a bit messy.
An engineering team designs a new rocket that is faster and lighter than any other model being produced. However, the materials end up being so expensive that no company can afford to buy them. Which step of the engineering process should have addressed this problem?
Answer:
Evaluate the answer or Know the background may be the answer. Same question was asked by a person name razielhernandez10 and he got these answers.
Evaluate the answer that should address this problem.
The answer is option A.
What is the correct order of the engineering process?Engineering layout Loop: the stairs of the design technique encompass: identifying the need, studying the trouble, increasing possible solutions, picking out the maximum promising solution, assembling a prototype, checking and examining the prototype, speaking the layout, and redecorating.
The engineering layout method starts off evolved via defining a problem and completing heritage studies at the hassle. Requirements are targeted and a solution is selected. A prototype of the solution is constructed after which examined. If the answer built meets the necessities then the outcomes may be shared.
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Density is the ratio of a substance ___ to its volume
A. Force B. Mass C. Thickness D. Weight
Answer:
Mass
Explanation:
how does chemistry affect our world?
Answer:
Research is constantly deepening our understanding of chemistry, and leading to new discoveries. Chemistry will help us solve many future problems, including sustainable energy and food production, managing our environment, providing safe drinking water and promoting human and environmental health.Chemistry is a big part of your everyday life. You find chemistry in daily life in foods you eat, air you breathe, soap, your emotions and literally every object you can see or touch. ... Food is made from chemicals. Many of the changes you observe in the world around you are caused by chemical reactions.By observing chemical reactions, we are able to understand and explain how the natural world works. Chemical reactions turn food into fuel for your body, make fireworks explode, cause food to change when it is cooked, make soap remove grime, and much more.
where are chemicals found at work? answer 1- in every work area answer 2-only in food preperation answer 3-only in carpets or paint answer 4- only in cleaing products
Answer:
In every work area
1. Which of the following best describes the relationship
between cells and living things in general? *
O A The larger the living thing, the larger are its cells.
O B All living things are made up of one or more cells.
O c The number of cells in all living things is the same.
O D There is one kind of cell of which all living things are made.
Convert -32 F into K
Answer:
-32 Fahrenheit converts to 237.594 Kelvin
If the density of mercury is 13.6g/ml, what is the mass in grams of 3426 ml of the liquid?
A copper cylinder, 12.0 cm in radius, is 44.9 cm long. If the density of copper is 8.90 g/cm^3, calculate the mass in grans of the cylinder. (Assume pi=3.14
Answer:
1. 46593.6g
2. 177065.856g
Explanation:
1. 13.6*3426=46593.6g
2. [tex]\pi r^{2}[/tex] = [tex]12^{2}[/tex] * 3.14=452.16 [tex]cm^{2}[/tex] (area of circle)
452.16*44.0=19895.04 [tex]cm^{3}[/tex] (volume of cylinder)
8.90*19895.04=177065.856g
≈177065.9g
Hope this helps.
Which of the following is an example of a chemical change? A. Boiling water B. Burning paper C. Dissolving sugar in water D. Melting gold
Answer:
burning paper
Explanation:
all the other choices dont actually affet the item itself in a chemical way only physically. Any time a substance is burned it causes combustion therefor a chemical reaction takes place.
What is component of John Dalton’s atomic theory?
Answer:
•Matter is made up of smallest indivisible particle named as atom.
•All atom of same element have equal atomic mass and identical properties.
•Compounds are made up two or more different types of atoms.
•In a chemical reaction rearrangement of atoms takes place.
•Atoms of different elements differ in mass and size.
What two units are typically shown on thermometers?
Answer:
Fahrenheit and Celsius
Explanation:
Express 66.3 L to milliliters.
Answer:66300
Explanation:
1 Liter is equal to 1000 mL, so you would multiply 66.3(1000)
A 1.0-gram sample of solid iodine is placed in a tube and the tube is sealed after all of the air is removed. The tube and the solid iodine together weigh 27.0 grams. The tube is then heated until all of the iodine evaporates, filling the tube with iodine gas. After heating, the total mass will be:
Answer:
27.0
Explanation:
Because Mass can neither be created nor be destroyed hence total mass of sample of iodine and tube remain equal as it is sealed.
state their effects of aqueous solution of AL2(SO4)3 on litmus paper
Answer:
Turns blue litmus paper red
Explanation:
Aluminium sulphate Al₂(SO₄)₃ is a water soluble salt. It dissolving in water in an exothermic process to form an acidic solution. Solid aluminium sulfate could have a corrosive effect on metals, while aluminium sulfate in aqueous form has a pH lower than 7
Due to its acidic nature, aluminium sulfate can be added to garden soil to reduce its pH by forming dilute sulfuric acid, H₂SO₄ and crystals of aluminium hydroxide, Al(OH)₃.
A rock occupies a volume of 20 cm and has a mass of 54 g. Find the density of
this rock.
Answer:
Hey there!
Density=Mass/Volume
Density=54/20
Density=2.7 g/cm^3
Let me know if this helps :)
You are planting flowers in large pots. You plan to plant flowers in 10 pots. 15 cups of potting soil will fill one pot. A bag of potting soil contains 25 cups. How many bags of potting soil do you need? show work
Answer:
I will need six (6) bags of potting soil
Explanation:
Since you plan on planting in 10 pots and need 15 cups of potting soil per pot, the total amount of potting soil you need (in cups) is 10 X 15 = 150 cups of potting soil.
We have that a bag contains 25 sups. to get the number of bags needed, we have to divide 150 by 25. This will give us 150 / 25 = 6 bags.
Therefore, I will need six (6) bags of potting soil
Perform the following mathematical operations and express each result to the correct number of significant figures. a. 97.381 ÷ 4.2502 + 0.99195 b. 171.5 + 72.915 – 8.23 c. 1.00914 ÷ 0.87104 + 1.2012 d. 21.901 – 13.21 – 4.0215
Answer:
The answer is below
Explanation:
When estimating significant numbers, the following applies:
i) All non zero digits are significant
ii) Zeros before non zero digits are not significant
iii) Zeros placed between non zero digits are significant
iv) Trailing zeros to the right of decimals or trailing zeros in whole number are significant.
When estimating, we use the number with the highest number of significant figure.
a) 97.381 ÷ 4.2502 + 0.99195
=22.912098 + 0.99195 = 23.90405 to 5 s.f
b) 171.5 + 72.915 – 8.23 (72.915 has 5 s.f)
= 236.185 to 3 s.f
c) 1.00914 ÷ 0.87104 + 1.2012 (1.00914 has 6 s.f)
= 2.35975 to 6 s.f
d) 21.901 – 13.21 – 4.0215 (21.901 has 5 s.f)
= 4.4895 to 5 s.f
Definition of science
Answer: science is the systematic way of gaining knowledge about nature
HELP! WILL MARK BRAINLIEST!! please in your own words!! due today!! doesn't need to be long!!
Answer:
A Drug That Slowly Cures Cancer
Explanation:
They create a lot of drugs so maybe a drug that would slowly kill off the cancer in the person's body. It would save many lives.
Answer:Chemists analyze substances. They determine what is in a substance, how much of something is in a substance, or both. ...
Chemists create, or synthesize, new substances. ...
Chemists create models and test the predictive power of theories. ...
Chemists measure the physical properties of substances.
i WOULD LIKE Nanopesticides
Nano-formulated pesticides can deliver active ingredients where they are needed without polluting the environment or – like neonicotinoids have been accused to do – indiscriminately kill essential wildlife. And more efficient agrochemicals are urgently needed to support a global population that will reach 10 billion by 2050.
So far, only a few studies have shown that nanoagrochemicals are actually more efficient than their traditional counterparts, and none of them have been tested in the field yet.
1.what causes a fire tornado to form ?
2. how are firefighters expected to deal with them ?
3. why are fire tornadoes rare ?
Someone please quickly help
please help me I need this answered ASAP. You take a 10-day trip across the country by car. At the beginning of the trip you zero the odometer and every evening you write down the odometer reading At the end of the trip you make a graph of cumulative miles travelled vs the day the measurement was taken
Which of the following do you think is true?
a) The mileage is the independent variable and the day is the dependent variable.
b) The day is the independent variable and the mileage is the dependent
variable.
C) Neither variable is independent or dependent
The image to the right is an odometer, which measures the number of miles traveled based on the rotation of the car's wheels This car traveled 91.308 miles
explain your reasoning
The day is the independent variable and the mileage is the dependent variable. Thus option B is correct.
What are the types of variables in experiment ?
Variables are the measurable parameter can be manipulated and controlled in research. For example person's eye color, its value can be changed from brown to blue depend on different factors.
An independent variable is a single character where Age is an example of an independent variable and dependent variable depend on other variable like it can be changed by other components.
Control variable remain constant and show no effect on other variables. It is used to prevent bias in an experiment. An intervening variable or mediator variable is another variable can modify the relationship between dependent and independent variables.
Thus option B is correct.
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Complete the statement about the environment and its components.
An environment is when its components, such as forests, parks, houses, and schools, contribute favorably to the people living in that environment.
Reset
the environment is Healthy