Answer:
A reflected ray always comes off the surface of a material at an angle equal to the angle at which the incoming ray hit the surface. In physics, you'll hear this called the law of reflection. You've probably heard this law stated as "the angle of incidence equals the angle of reflection
Explanation:
element A it's valance number is 3 and element B it's valance number is 6 make it compound
Answer:
A2B
Explanation:
A = 3
B = 6
exchange valencies
A6B3
A2B
True or false? Covalent molecules are formed when non-metal atoms share electrons with other non-metal atoms.
Answer:
true
covalent bonds are between non metals and nonmetals. and they are sharing electrons.
What is the molecular formula of paradichlorobenzene that has a molar mass of 147.g/mol and an empirical formula of C3CIH2?
Answer:
the molecular formula of paradichlorobenzene is C6H4CL2
Magnesium bromide is prepared in a laboratory using the reaction below. Typically, the magnesium bromide is recoveted as a solid by heating way the remaining water
Mg(s) + 2 HB-(aq) - MgBrac) + H200)
If 0.940 mole of HBr in solution is added to 16.5 grams of Mgo in a beaker and then is heated until dry, what are the expected contents of the beaker?
If you have 90L of water, what is the volume?
Answer:
900
Explanation:
Which of the following is an example of a ball of clay undergoing a physical change?
I. The ball is thrown into the air
II. The ball is broken into two separate halves
lll. The ball is rolled along the ground
lV. The ball is flattened into a pancake like shape
Answer:
II. The ball is broken into two separate halve. The ball is still a ball. It is just in a different form.
IV. This one is also correct because it is only changing the physical state of the ball. The ball is still a ball.
What mass of potassium chloride, KCl, is produced when 12.6 g of oxygen, 02, is produced?
Mass of KCl= 19.57 g
Further explanationGiven
12.6 g of Oxygen
Required
mass of KCl
Solution
Reaction
2KClO3 ⇒ 2KCl + 3O2
mol O2 :
= mass : MW
= 12.6 : 32 g/mol
= 0.39375
From the equation, mol KCl :
= 2/3 x mol O2
= 2/3 x 0.39375
=0.2625
Mass KCl :
= mol x MW
= 0.2625 x 74,5513 g/mol
= 19.57 g
BRIANLIEST!!!!!!
Use the mass to calculate the number of moles in a 347.89 g samples of ammonium
Answer:
20.46 moles
Explanation:
1 mole of NH3 contains 17gm of NH3
so 347.89 gm of ammonia is in,
347.89/17 moles
=20.46 moles
NOTE. There should be ammonia instead of ammonium in question because ammonium is an ion not a compound.
HELP HELP HELP HELP HELP HELP HELP HELP HELP
Answer:
3
Explanation:
I got this i am very smart
Answer:
The answer is 3) same mass more volume
Explanation:
Mass measures the amount of matter in a substance or an object.
Volume measures the amount of space that a substance or an object takes up.
PV=nRT is an example that deacribes the relationship between pressuee, volume,moles and temperature of a gas. This is an example of a
Answer:
This is an example of Avogadro equation
Plz help I need the answer now!! Which statement is best supported by the evidence on the map?
A. Oil is produced mostly in the southern part of Africa.
B. Gold is found in every country in Africa.
O
C. Iron ore is found mostly in northern Africa.
D. Each country in Africa has about the same amount of each natural
resource.
Answer:
I'd say C. You can eliminate the rest of the answers and get C. Most of the iron is found up North on the map.
Explanation:
Use the periodic table to determine the molar mass of each of the following elements. Use the correct number of significant figures.
Potassium (K):
g/mol
Osmium (Os):
g/mol
Manganese (Mn):
g/mol
Answer:
Potassium (K): 39.10 g/mol
Osmium (Os): 190.23 g/mol
Manganese (Mn): 54.94 g/mol
Explanation:
Just got it right on Edge 2021
The molar mass of the following elements are
Potassium (K): 39.10 g/mol
Osmium (Os): 190.23 g/mol
Manganese (Mn): 54.94 g/mol
What is molar mass?The molar mass of a substance is grams of one mole of that substance.
It can be calculated by dividing the atomic weight of the element, and the number of atoms found in that element.
Manganese is a transition metal with the atomic number 25.
Potassium is an essential mineral that is an alkali metal and its atomic number is 19.
Osmium is also a transition metal whose atomic number is 76.
Thus, the molar mass of the elements are, Potassium (K): 39.10 g/mol
Osmium (Os): 190.23 g/mol
Manganese (Mn): 54.94 g/mol
Learn more about molar mass
https://brainly.com/question/12127540
Be able to describe the relationship between Freedom of Movement and phase change.
Ion knoe Wdym by “be able to describ’ so ima put it in my own words idr lol:)
if you talm bout some kentic energy or sum ok but other Dan dat ion knoe tbh
I can explain how transferring kinetic energy in and out of a substance can cause a change
How do you solve -8r=240
Answer:
You solve that dividing beach term by -8 and simplifying which for this answers will give you r=-30
Explanation:
Pls correct me if I’m wrong.
Hope this helps :)
If the price of peaches increases, what can be expected?
More peaches will be sold.
Fewer peaches will be sold.
The number of peaches sold will be unaffected.
Peach orchards will produce less fruit.
Answer:
fewer peaches will be sold
Explanation:
if the price increases less people will want to buy it, but the orchards would still get money so they wouldnt be affected
Answer:
fewer peaches
Explanation:
Chromosomes _____. (Choose all that apply)
1.) Are tightly coiled bundles of DNA
2.) Carry many genes
3.) Are found inside the nucleus of eukaryote
4.) Can be used to diagnose genetic disorders
5.) Outnumber genes in a cell
Answer:
1.) Are tightly coiled bundles of DNA
2.) Carry many genes
3.) Are found inside the nucleus of eukaryote
4.) Can be used to diagnose genetic disorders
Explanation:
A chromosome is a thread-like structure made up of DNA. The chromosomes are made of DNA which are tightly coiled around protein.
Chromosomes carry hundreds and thousands of genes. The number of genes in a cell outnumbers the number of chromosomes.
In eukaryotic cells, all the chromosomes are found inside the nucleus of eukaryote.
The chromosomes and DNA can be examined so as to diagnose genetic disorders.
What is the total number of joules required to freeze a 10 g sample of water at 0°C?
show work if possible and will give brainliest
Explanation:
the answer will be 98.4 kJ
As per concept of enthalpy of fusion , 98,397 joules of energy are required to freeze 10 g of water at 0°C.
What is enthalpy of fusion?Enthalpy of fusion is defined as the enthalpy change which results from when a substance changes its state from solid to a liquid at a constant pressure.Heat of solidification is opposite of enthalpy of fusion.During fusion there is a phase transition which takes place, from liquid to solid.
The temperature at which the fusion takes place is called as the fusion temperature. This enthalpy is accompanied without any change in temperature.
Enthalpy of fusion of water=333.55 J/g . This value is for 1 g of water as per definition,hence for 10 g water enthalpy of fusion is 10×333.55=3335.5 J.
Hence, 3335.5 joules are required for freezing 10 g sample.
Learn more about enthalpy of fusion,here:
https://brainly.com/question/17405472
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2
A brick has a mass of 4.0 kg and the Earth has a mass of 6.0 x 10
Use this information to answer the questions below. Be sure your answers have the correct number of significant digits.
What is the mass of 1 mole of bricks?
?
How many moles of bricks have a mass equal to the mass
of the Earth?
Answer:mass of 1mole of brick = mass of 1 brick x avagadro number
= 4 kg x 6.022 x 10^23 bricks = 2.4 x 10^24 kg
No. of moles of bricks have a mass equal to the mass of the earth
= mass of earth / mass of 1 mole of brick
= [ 6 x 10^27 ] / [ 2.4 x 10^24 ]
= 2.5 x 10^3
= 2500 moles
Explanation:
A chemist weighed out 2.9 g of nickel. Calculate the number of moles of nickel she weighed out. Be sure your answer has the correct number of significant digits.
Answer:moles = 2.9 g Ni × 1 mol Ni 58.69 g Ni = 0.0663 mol Ni
At room temperature , 1 mL of water has a mass of 1 gram . What is the percent by mass of a 428 mL magnesium citrate ( solution containing 0.1 mol of magnesium citrate ?
Answer:
5.0% by mass
Explanation:
Percent by mass is 100 times the ratio between the mass of solute (Magnesium citrate) in the mass of solution.
Mass of Magnesium citrate -Molar mass: 214.41g/mol-:
0.1mol * (214.41g/mol) = 21.441g
Assuming the volume of the solution is just due the solvent -Water-, the mass of water is 428g.
Percent by mass is:
21.441g / 428g * 100 =
5.0% by massStoichiometry :
2 AlCl3 + 3 MgSO4 --> Al2(SO4)3 + 3 MgCl2
If 633.1 g AlCl3 reacts, how many moles of MgCl2 are formed?
TRUE OR FALSE
If mechanical energy is conserved, the kinetic energy you end up with always equals the potential energy you lost.
........false.........
Question:
One of the properties we associate with diamonds is their luster. How would you define this
term?
Plz help?!
Answer:
luster means either sheen/glow or reflected light
Explanation:
luster is the appearance of mineral's surface in terms of light-reflective qualities
A _____ is two or more substances that are together in the same place but are not chemically combined.
Answer:
Mixture
Explanation:
A mixture has two or more substances that are together in the same place but are not chemically combined .
HOPE THIS HELPS YOU;)
Help pls thnk you!!!!
Plant cells and animal cells were observed under a microscope. The characteristics of two cells are listed below.
Cell X: Has chloroplast
Cell Y: Does not have a cell wall
Which statement about the two cells is correct? (5 points)
a
Cell X has a cell membrane.
b
Cell X has a small vacuole.
c
Cell Y has a large vacuole.
d
Cell Y has chloroplast.
Answer:
The answer is B
Explanation:
ITs B
Answer:
Cell X has a cell membrane
Explanation:
I took the test and got it right.
y = (x-16)2 A. Shift the graph of y = x2 down 16 units. B. Shift the graph of y= x2 right 16 units. C. Shift the graph of y = x2 left 16 units. D. Shift the graph of y = x2 up 16 units.
Answer:
Uhmm i think i dont know the sent r 6un Dury r in eyeing in d7ue
What is the amount of diamine silver that can be formed when 10.00 g AgCl is mixed with 1.00 L of 0.100 M NH3?
The amount of diamine silver chloride = 8.87 g
Further explanationGiven
10 g AgCl
1.00 L of 0.100 M NH3
Required
the amount of diamine silver
Reaction
AgCl + 2 NH₃ → [Ag(NH₃)₂]Cl
mol AgCl :
= mass : MW
= 10 g : 143,32 g/mol
= 0.0698
mol NH₃ :
= M x V
= 0.1 x 1
= 0.1
NH₃ as a limiting reactant
mol [Ag(NH₃)₂]Cl based on NH₃ :
= 1/2 x mol NH₃
= 1/2 x 0.1
= 0.05
Mass diamine silver :
= 0.05 x 177.3822 g/mol
= 8.87 g
how many grams of ZrCl4 can be produced if 123 g of ZrSiO4 react with 85.0 g of Cl2?
Answer:
153.3 grams of ZrCl₄ are produced
Explanation:
The equation of the reaction is as follows:
ZrSiO₄ + Cl₂ ----> ZrCl₄ + SiO₂ + O₂
molar mass of ZrSiO₄ = (91 + 32 + 16 * 4) = 187.0 g/mol
molar mass of ZrCl₄ = (91 + 35.5 * 4) = 233.0 g/mol
molar mass of Cl₂ = (35.5 * 2) 71.0 g/mol
From the equation of reaction, 1 mole of ZrSiO₄ reacts with one mole of Cl₂ to produce one mole of ZrCl₄
number of moles of ZrSiO₄ present in 123 g = 123/187 = 0.65 moles
number of moles of Cl₂ present in 85.0 g = 85.0/71.0 = 1.19 moles
therefore, ZrSiO₄ is the limiting reactant
123.0 g of ZrSiO₄ will react with excess Cl₂ to produce 123 * 233/187 grams of ZrCl₄ = 153.3 grams of ZrCl₄
Therefore, 153.3 grams of ZrCl₄ are produced
a roller coaster train with a mass of 500 kg stops at the top of a hill if the hill is 110 m high what is the potential energy of the train
Answer:
Answer is 5000
Explanation:
5000 is your answer
Answer:
what the other person says their wright
Explanation:
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