Answers
Answer:
a) the atomic number is 15
b) the mass number is 15+16 = 31
c) element is phosphorus
d)Group 15 period 3
Related Questions
250J of heat was added to a 2 g block of metal. The temperature of the metal was increased by 139.4K. What is the specific heat capacity of the metal?
Use the below equation to calculate specific heat capacity.
Include three decimal places and do not use units in your answer.
cmetal = Q/mΔT
Answers
Answer:
0.897
Explanation:
Balance the following reaction
HgO → _ Hg +_ 02
Answers
Answer:
reeeeeeeeeeeeeeeeeeeee
Explanation:
cancer
When a strong acid is placed into water, what percentage of hydrogen ions (H+) will dissociate into the solution?
Answers
A student measures out 5 mL of calcium chloride solution into a small container and 5 mL of sodium carbonate solution in another small container. The total mass of both chemicals and the containers they are in is 15.5 g. When the student combined the two clear liquids, a gooey, cloudy precipitate formed. What would the total mass of the products and the two containers be after this reaction took place?
Answers
Answer:
15.5g
Explanation:
"The total mass of both chemicals and the containers they are in is 15.5 g." After a chemical reaction, by conservation of mass, the total mass of the products and the two containers after reaction is the same at 15.5g.
Answer:
15.5
Explanation:
in a chemical reaction, mass is conserved
so mass after reaction = mass before reaction = 15.5 g
HELP!! ASSIGNMENT DUE TODAY! PLEASE HELP!!! I'LL GIVE 21 POINTS!!!!
Respiration occurs in the cytoplasm and _________ of cells.
Answers
mitochondria
im not 100% sure but it makes sense
The nucleus in the center of an atom contains ___ and __ ?
Answers
Answer:
protons and neutrons
Explanation:
The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).
Which of the following gas samples would have the largest volume, if all samples are at the same temperature and pressure?
1) 5*10^23 molecules of O2
2) 263 grams of Xe
3) 0.403 moles CH4
4) they would all have the same volume
Answers
Answer:
d
Explanation:
they would all have the same volumes
List the following elements from increasing electronegativity: boron, magnesium, calcium, chlorine, argon
Answers
Answer:
The list of elements from increasing electronegativity: Calcium < magnesium < chlorine < argon < boron.
Explanation:
In the periodic table if you move from left to right there would be an increase in the electronegativity of the elements. If you move from the bottom to the top of the groups in the periodic table the electronegativity increases and if u move to the bottom from down its decreases.
Calcium is in the 2nd group below magnesium so calcium is the least electronegative among given elements then magnesium and then chlorine as it is top of magnesium then argon, as it is right to the chlorine, and boron has the most electronegativity as it is above rest of the elements.
Students place paper clips on a desk and then hold a magnet under the desk. What evidence would BEST show that the
magnetic field was able to pass through the desk?
O A The top of the desk is made of a kind of plastic.
OB. The paper clips move when the magnet is moved under the desk.
OC. The magnet they are using is the largest one in the classroom.
OD. The students were able to pick up these paper clips with a magnet.
Answers
Answer:
B
Explanation:
got it right on test
Answer:
Yes the correct answer is B
Explanation:
Have a good day!!!
GAS LAW:
If 2.2 liter of hydrogen are heated from 0 degrees celsius to 95 degrees celsius at the constant pressure what is the new volume?
Answers
Answer:
bh yftd5xsdcfvgbhnjm
Explanation:
8. What is involved in building and running the mine
Answers
Answer:
Explanation:
minimizing environmental effects.
ensuring public health and safety.
preserving water quality.
establishing new landforms and vegetation.
removing waste and hazardous material.
stabilizing land to protect against erosion.
What is the name of this hydrocarbon
Answers
Answer:
the IUPAC name of the following compound is 2,3 dimethyl pentane!
What is the [OH-] in a solution that has a pH = 9.23? *
O 1.7x10^5
O 8.2x10^-9
1.7x10^--5 M.
Answers
Answer: 1.7x10^-5
Explanation:
pH + pOH = 14
14 - pH = pOH
14 - 9.23 = 4.77
pOH =4.77
[OH-] = 10^-pOH
= 10^-4.77
= 1.698243x10^-5
= 1.7x10^-5
For a constant waves speed,wavelength,of the wave increases with a(n)______
Answers
Answer:
higher frequency
Explanation:
A 2.25 mol sample of oxygen occupies 1.80 L at 25.0°C. What volume will
it occupy with 3.7 moles?
Answers
Answer:
2.96 L
Explanation:
We apply the Ideal Gases Law to determine this:
P . V = n . R . T
Firstly we need to know the pressure for the 2.25 moles
P . 1.80L = 2.25 mol . 0.082 L.atm/mol.K . 298K
(We convert T°C to T°K, 25°C + 273 = 298K)
P = (2.25 mol . 0.082 L.atm/mol.K . 298K) / 1.80L
P = 30.5 atm
So now, we apply the pressure value for the new conditions:
30.5 atm . V = 3.7 mol . 0.082 . 298K
V = (3.7 mol . 0.082 . 298K) / 30.5atm = 2.96 L
1 point
Calculate the [H+] in a solution with a pH of 3.71, and identify the solution
as acidic, basic or neutral. *
1.9x10^-4 M ; acidic
5.12x10^-10; acidic
02.4x10^-3 M ; basic
Answers
Answer:
I don't have any idea of this question
6. Too much rainwater can cause a slope or hillside to collapse through a process called a
(6 Points)
mudslide
snowslide
o avalanche
storm
Answers
Answer:
mudslide
Explanation:
a mass of mud and other earthy material that is falling or has fallen down a hillside or other slope
What is the pH of a solution that is 100x more acidic than a solution with a pH of 5?
Answers
Answer:3
Explanation:
If anyone is taking Integrated Physics and Chemistry (2014) on sos can u pls help me w something !! Thanks
Answers
I am so sorry i cant help but good luck
Can someone help me out with why is the outer core of Earth is important in you’re own words?! A mini paragraph plsss
Answers
Answer:
the outer core is important because the outer core is responsible for earth's magnetic field which protects earth from harmful particles that comes from sun and also contains some natural metal like nikle and iron.
is this much paragraph enough comment down below..
hope this helps you ☺️☺️
How many molecules are in 88g of carbon dioxide?
Answers
therefore no. of molecules =
therefore no.of molecules= 12.046*10^23
Answer:there are 44 grams
What is the initial reactant for a fusion reaction in the sun?
a) Iron-56
b) Hydrogen-1
Answers
Hydrogen
Pog Pog Pog I'm a PogChamp
Hydrogen-1 serves as the starting reactant in fusion reactions in the sun. This is due to the sun's composition, which is around 70% hydrogen and 28% helium with 2% heavier components. As a result, hydrogen-1 is both the most prevalent and most likely to be employed in a fusion process in the sun.
What is the way to make helium-4 ?Two hydrogen-1 nuclei are fused together to create a helium-4 nucleus in the sun's fusion reaction, which releases energy in the process. This is the most significant energy source in the sun and is known as the proton-proton chain reaction.
When two hydrogen-1 nuclei collide to generate a deuterium nucleus, a gamma ray is released as a result, starting the reaction. Then, this deuterium nucleus strikes another.A helium-3 nucleus is created from a hydrogen-1 nucleus, which also produces a gamma ray.
The reaction is finally finished when two helium-3 nuclei meet to produce a helium-4 nucleus, producing two gamma rays in the process. Since hydrogen-1 is the most prevalent element in the sun and the element that is most likely to be employed in the proton-proton chain reaction, it is the first reactant for a fusion process in the sun.
A deuterium nucleus is created by the collision of two hydrogen-1 nuclei, which is followed by a sequence of further processes that ultimately result in the development of a helium-4 nucleus.
Learn more about fusion reaction at:
https://brainly.com/question/4837991
#SPJ3
this refers to the speed of an object at a specific moment in time
Answers
Answer:
Instantaneous speed is the speed of an object at a specific moment in time
What is the concentration of a solution with a volume of .45 L that contains .9 moles of Iron (II) chloride?
Answers
Answer:
the concentration of the solution is 2 mol/L.
Explanation:
Molarity is defined as the concentration of a solution expressed in terms number of moles of solute per liter of solution.
Mathematically Molarity is expressed as follow;
[tex]Molarity = \frac{Moles \ of \ solute}{Liters \ of \ solution} \\\\[/tex]
Given;
Volume of the solution, V = 0.45 L
Moles of the solute, n = 0.9 moles
The concentration of the solution [tex]= \frac{0.9}{0.45} = 2 \ mol/L[/tex]
Therefore, the concentration of the solution is 2 mol/L.
PLEASE HELP!!!! Assuming a lacrosse ball weighs 5.5 ounces and is made of mainly rubber which has a mass of 82.2 g/mol, how many particles are in a lacrosse ball?
Answers
EXPLANATION:
5.5 oz = 155.92 g
155.92 g x (1 mol/82.2 g) = 1.8956 mol
(6.02 x 10^23) x 1.8956 = 11.412 x 10^23
Which term describes the following group of planets: Jupiter, Saturn, Uranus, and
Neptune?
Answers
Answer:
Gas giants.
Explanation:
Jupiter, Saturn, Uranus, and Neptune are the gas giants of our solar system.
"Reduce, reuse, recycle." Give examples of how one or more of
these ideas can be applied to the issues and practices of hydraulic
fracturing for the acquisition of shale gas.
Answers
Answer:
Examples of how the ideas can be applied to the issues and practices of hydraulic fracturing for the acquisition of shale gas are;
Reuse; The produced water in obtained from oil and gas well production are reused for fracking, drilling, and if the water is good enough, it can be used for farming
Reduce; The use of recycled brine and water in drilling and fracking process reduces the application of freshwater in the those processes and reduces pollution of natural water sources
Recycle; Recycling involves creating products from waste. In the hydraulic fracturing process approximately 13 percent of the water produced and the flowback water are recycled to be used more than once thereby reducing the net consumption of freshwater
Explanation:
In hydraulic fracturing, also known informally as fracking, is the drilling method used in oil and gas well development process that makes use of water sand and chemical injection through the well bore to open and widen cracks in the bedrock formations in the areas around the wellbore.
Science there’s a picture
Answers
Answer:
D)
Explanation:
seems like the most logical option out of all listed.
Which of the following equations is balanced?
2H2 + O2 + 4H20
4Na + O2 - 2Na20
Fe2O3 + H2 - 2Fe + 3H20
CH4 + O2 - CO2 + H20
Answers
Answer:
4Na + O2 - 2Na20Is the balanced equations .
What type of reaction is this?
Answers
Answer:
Decomposition