Answer:
Explanation:
A new Material is formed.
Basically, Chemical changes differ from Physical changes because in chemical changes, Substances have the ability to become a different substance.
Example:
Water to ice is a physical change because it is still water despite being a solid from liquid.
A Magnesium strip placed in CuSO4 solution made the Mg strip turn into a new substance which is MgSO4. this is a Chemical change because Mg has now become a different substance called MgSO4.
Draw the orbital notation for the element Boron
Answer:
I can't draw but you could draw 2 electrons in the first orbit and 3 electrons in the second orbit.
Explanation:
Answer:
Your talking about this correct?
Explanation:
Molecules are formed from ?
Please help me I’ll mark you the brainiest! Please do NOT answer if you don’t know it.
Answer: It is B
Explanation:
EAZYYYY
How can an igneous rock become a sedimentary rock?
On the surface, weathering and erosion break down the igneous rock into pebbles, sand, and mud, creating sediment, which accumulates in basins on the Earth's surface. As successive layers of sediment settle on top of one another, the sediment near the bottom is compressed, hardens, and forms sedimentary rock.
help please! it’s due in a few
Answer:
C
Explanation:
Electrons are negatively charged with a charge of -1e. They can move between atoms while protons stay in the atom.
Which is more dense:
(b)Oxygen or air?
Answer:
I think air is more denser than oxygen
11.) If the total mass of the products of a reaction is 250 grams, what was the total mass
of the reactants?
Answer:
Total
Hxbdvdbdj
125 grams
2.
How many moles are contained in 0.800 g of calcium chloride (CaCl2)?
Even a small sample of matter may contain millions and millions of atoms, molecules or ions. To represent these entities the unit mole is used. The number of moles in 0.800 g of CaCl₂ is
What is number of moles?One mole of a substance is defined as that amount of it which contains as many particles or entities as there are atoms in exactly 12 g of Carbon - 12 is called the mole.
The equation which is used to calculate the number of moles is:
Number of moles (n) = Given mass / Molar mass
The mass of one mole of molecules of a substance is called the molar mass.
Here the given mass of CaCl₂ is 0.800 g and the molar mass is 110.98 g/mol. Then,
n = 0.800 g / 110.98 g / mol = 0.0072 mol
Thus the number of moles is 0.0072 mol.
To know more about moles, visit;
https://brainly.com/question/15209553
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When 1.008 g of hydrogen reacts with chlorine in a calorimeter containing 500.00 g water, the
temperature rises from 25.00 °C to 29.24 °C. Calculate water for the process. (Remember,
change in T determines (1) the number of significant digits and (2) the sign of your
answer.)
H2(g) + Cl2(9) --> 2HCl(g)
A) -8.870 kJ
B) +8870 J
C) -8870 J
D) +8.870 kJ
The heat released by reaction : C) -8870 J
Further explanationGiven
1.008 g of hydrogen
500.00 g water
The temperature rises 25.00 °C to 29.24 °C
Required
energy required
Solution
Q absorbed by water :
Q = m.c.Δt
Q = 500 g x 4.18 J/g C x (29.24-25)
Q = 8870.08 J
The reaction to produce HCl is an exothermic reaction (releasing heat), so that Q is negative
Q water = -Q HCl = -8870.08 J
The name is As2S5 is?
Answer:
i dont no......
Explanation:
...........
Determine if the individual bonds in each compound are polar or nonpolar.
Include electronegativity values and the difference to show your work.
EXAMPLE: Se=2.4 O= 3.5 3.5-2.4=1.1 Polar
1. SCl2
2. H2S
3. CF4
4. PC15
5. CHA
6. CaBr2
7. SF2
8. CO2
9. NH3
10. Na s
Answer:
See explanation
Explanation:
For SCl2
S = 2.8, Cl = 3.16 difference = 0.4 polar
H2S
H = 2.2 S= 2.8 difference = 0.6 polar
CF4
C = 2.55, F= 3.98 difference = 1.43
This compound is nonpolar irrespective of the difference in electronegativity because the molecule is symmetrical
PCl5
P= 2.19, Cl= 3.16 difference = 0.97
This compound is nonpolar irrespective of the difference in electronegativity because the molecule is symmetrical
CH4
C = 2.55 H = 2.2 difference = 0.35 the molecule is nonpolar
CaBr2
Ca= 1 Br= 2.96 difference = 1.96
The compound is not just polar but ionic in nature due to large electronegativity difference between the bonding atoms
SF2
S = 2.8 F= 3.98 difference = 1.18
The molecule is polar
CO2
C= 2.55 O= 3.44 difference = 0.89
This compound is nonpolar irrespective of the difference in electronegativity because the molecule is symmetrical
NH3
N= 3.04 H = 2.2 difference =0.84
The molecule is polar
NaS
Na= 0.93 S = 2.8 difference = 1.87
The compound is not just polar but ionic in nature due to large electronegativity difference between the bonding
A gas with a volume of 4.0L at a pressure of 205 kPa is allowed to expand to a volume of 12000 mL. What is the pressure in atmospheres in the container if the temperature remains constant?
Answer: The pressure in atmospheres is 0.674 in the container if the temperature remains constant.
Explanation:
Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.
[tex]P\propto \frac{1}{V}[/tex] (At constant temperature and number of moles)
[tex]P_1V_1=P_2V_2[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 205 kPa
[tex]P_2[/tex] = final pressure of gas = ?
[tex]V_1[/tex] = initial volume of gas = 4.0 L
[tex]V_2[/tex] = final volume of gas = 12000 ml = 12 L (1L=1000ml)
[tex]205\times 4.0=P_2\times 12[/tex]
[tex]P_2=68.3kPa=0.674atm[/tex] (1kPa=0.0098atm)
Therefore, the pressure in atmospheres is 0.674 in the container if the temperature remains constant.
Answer:
P2=68.33 mm Hg
Explanation:
P1V1=P2V2
PLUG IN
CONVERT mL TO L (12000mL=12L)
(205)(4)=(P2)(12)
DIVIDE BOTH SIDES BY 12
P2= 68.33 kPa
0.3 / 48 tsps x 100 =
help mee
Answer:
0.625
Explanation:
i hope this is correct! and that it helps!! c:
PLS HELP I REALLY NEED IT IM ON THE VERGE OF TEARS
How many liters of O2 at STP will react with 8.7 grams of C2H4 to form CO2 and H2O?
C2H4 + 3 O2 -------> 2 CO2 + 2 H2O
the answers could be
22
21
2.3
I though the answer would be 26.1 PLSPLSPLS HELP
The volume of O₂ : 21 L
Further explanationGiven
8.7 grams of C₂H₄
Required
Volume O₂
Solution
Reaction
C₂H₄ + 3 O₂ ⇒ 2 CO₂ + 2 H₂O
mol C₂H₄(MW= 28 g/mol) :
= mass : MW
= 8.7 g : 28 g/mol
= 0.311
From the equation, mol O₂ :
= 3/1 x mol C₂H₄
= 3/1 x 0.311
= 0.933
At STP, 1 mol gas=22.4 L, so for 0.933 mol :
= 0.933 x 22.4 L
= 20.899 L ≈ 21 L
Answer this for 100 points.
Answer:
A I think
Explanation:
Answer:
I am definitly sure that the answer is C
Explanation:
potential energy is the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.
Plz help ! confused
Answer:
b.a convex lens forms a smaller,real image.
Hello, I need some help writing a paragraph about the water cycle! If u can write a paragraph EXPLAINING the water cycle i would be so happy. But if u do that make sure you use all of the Vocabulary! Please help
Answer:
The water cycle, also known as the hydrologic cycle or the hydrological cycle, describes the continuous movement of water on, above and below the surface of the Earth. The mass of water on Earth remains fairly constant over time but the partitioning of the water into the major reservoirs of ice, fresh water, saline water and atmospheric water is variable depending on a wide range of climatic variables. The water moves from one reservoir to another, such as from river to ocean, or from the ocean to the atmosphere, by the physical processes of evaporation, condensation, precipitation, infiltration, surface runoff, and subsurface flow. In doing so, the water goes through different forms: liquid, solid (ice) and vapor. Hope this helps, mark as brainliest please!
How many grams is 4.15 liters of O2 at stp?
Answer:
Mass = 5.92 g
Explanation:
Given data:
Volume of O₂ = 4.15 mol
Temperature and pressure = standard
Mass in gram = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
By putting values,
1 atm × 4.15L = n ×0.0821 atm.L /mol.K × 273.15 k
4.15 atm.L = n ×22.43 atm.L /mol
n = 4.15 atm.L / 22.43 atm.L /mol
n = 0.185 mol
Mass in gram:
Mas = number of moles × molar mass
Mass = 0.185 mol ×32g/mol
Mass = 5.92 g
Which behavior is an example of how animals defend their territory?
O A. Rhinoceros males urinate to mark the area where they live.
OB. Several dolphins swim around a school of fish and take turns feeding.
OC. Hyenas and lions compete for prey. O D. A bee shares the location of food with other bees.
Answer: A
Explanation: because It shows how they mark there territory by unreining
Answer: O A. Rhinoceros males urinate to mark the area where they live.
Explanation:
O B. Is an example of animals working to together.
O C. This is competition rather than defending territory.
O D. Again an example of animals working together.
Make sure to study, as the text provided for A. P. E. X is extremely helpful! Don’t stress, make sure to stay hydrated, have self care, and remember self care isn’t just proper hygiene make sure you take care of your well being while making sure you’re mindful that you are just a person, have a good day! I love ya’ll and I’m proud of ya!
To clarify the answer is correct as I have the same Test (CST): Response to Stimuli:
HELP MEEEEEEEEEE!!!!
URGENT!!!!!
At the beginning of the 20th century, the convention wisdom is that the universe is static
and __________________.
Group of answer choices
mortal
stationary
momentary
eternal
Answer:yeet
Explanation:more yeet
Answer:
stationary is the answer
Explanation:
hope this helps u
There are many types of energy. Potential energy is the name for energy that is stored and can be converted into motion, heat, or electricity.
Which of the following is an example of stored energy?
A.
an automobile engine
B.
a compressed spring
C.
a campfire
D.
a hot stove
How do you write the formula for a salt?
Answer:
NaCl (sodium chloride)Explanation:
...
What does it mean when a cell is multicellular? I only have 5 minutes so please help.
a magnet has a north and south pole labeled in the drawing student A thinks that if you cut a magnet in half each ew parts will separate into either the north or the south poles is the student correct
Answer:
The student is Incorrect
Explanation:
Even if you break a magnet the poles still remains same. There is no
difference in the magnet Both north and south pole will be there even if you
cut it in to small pieces when you cut it into pieces, if suppose you break 2
magnets and put north and north together it will repel whereas if there are
different poles like north and south it will attract, so even if you break one
single magnet the different poles will attract, Hence the student is incorrect.
Please mark me as brainliest
Thank you :)Calculate the mass percent of Calcium Chloride in
5.00g of CaCl2 in 95.0 g of water
Answer:
5%
Explanation:
Given parameters:
Mass of calcium chloride = 5g
Mass of water = 95g
Unknown:
Mass percent of calcium chloride in solution = ?
Solution:
The mass percentage is the mass of the solute component divided by the total mass of the mixture multiplied by 100%.
So;
Mass of mixture = mass of calcium chloride + mass of water = 95g + 5g = 100g
Mass percentage of calcium chloride = [tex]\frac{5}{100}[/tex] x 100 = 5%
What is an air pressure system?
Answer:
"The number of air molecules above a surface determines air pressure. As the number of molecules increases, they exert more pressure on a surface, and the total atmospheric pressure increases. By contrast, if the number of molecules decreases, so too does the air pressure."
-
FeCl2 +
Cl2 →
FeCl3
How do I balance this?
Answer:
2FeCl2+Cl2→2FeCl3
Explanation:
A scientist is trying to develop a more efficient way to recycle paper this type of chemistry is known as
Answer:
Green chemistry
Explanation:
Green chemistry is the design of chemical products and processes that reduce or eliminate the use or generation of hazardous substances. Green chemistry applies across the life cycle of a chemical product, including its design, manufacture, use, and ultimate disposal(EPA, 2017).
Green chemistry, also called sustainable chemistry, is an area of chemistry and chemical engineering focused on the design of products and processes that minimize or eliminate the use and generation of hazardous substances(wikipedia).
Thus, any research in chemistry geared towards waste reduction(such as more efficient methods of paper recycling) and recycling of other materials as well as placing less demands on the natural sources of materials is known as green chemistry or sustainable chemistry.
Please help, I will give brainliest.
Answer:
A. manganese change from +7 to +2
Explanation:
Reduction means a gain of electrons, which means the oxidation number will go down or the charge goes down basically or become more negative charge. On the left, Mn has +7 in MnO4-. On the right, it has 2+, so it has been reduced.
please help :) thanks
Explanation:
it is the one you have selected because it is the only solid one
