Answer:
maybe
Explanation:
you could be high risk for coronavirus if you have asthma and are not safe.
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 :)Identify the group of elements with the same outermost energy level
a)H, He
b)N, P, As, Bi
c)Rb, Sr, Y, Zr
d)B, Si, As, Te, At
Answer:
A
Explanation:
b) N, P, As, Bi
Elements in the same group all have the same number of valence electrons and therefore similar chemical properties. Valence electrons help in predicting chemical reactions.So all the atoms of a given element have the same energy levels because they have the same numbers of electrons and protons.N, P, As, Bi for this group of elements, all these elements belongs to same group i.e. group 15. Group 15 has total 5 valence electrons.Electronic configuration = ns²np³All these elements will have same outermost energy level.Learn more:
brainly.com/question/371590
wood is A)element B)compound C)mixture
-
FeCl2 +
Cl2 →
FeCl3
How do I balance this?
Answer:
2FeCl2+Cl2→2FeCl3
Explanation:
The temperature of a substance is a measure of the
1.
average kinetic energy of its particles
2.
average potential energy of its particles
3.
ionization energy of its particles
4.
activation energy of its particles
Answer:
1. average kinetic energy of its particles
Explanation:
The temperature of a substance is a measure of the average kinetic energy of its particles.
The average kinetic energy of the particles of a substance is directly proportional to its temperature. This is one of the premise of the kinetic theory of gases.
When thermal energy is supplied to a substance, the molecules gains kinetic energy. As the kinetic energy increases so also the temperature of the substance. So, we see that kinetic energy and temperature are connected through the thermal energy acquired by the substance.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
what type of wave is shown ?
For the balanced equation shown below, if the reaction of 77.0 grams of CaCN2 produces 26.1 grams of NH3, what is the percent yield?
CaCN2+3H2O=>CaCO3+2NH3
%yield = 86.93%
Further explanationGiven
Reaction
CaCN₂+3H₂O=>CaCO₃+2NH₃
Required
The percent yield
Solution
mol CaCN₂(MW= 92 g/mol) :
= mass : MW
= 77 g : 92 g/mol
= 0.834
From equation, mol NH₃ :
= 2/1 x mol CaCN₂
= 2/1 x 0.834
= 1.668
Mass NH₃(theoretical):
= 1.668 mol x 18 g/mol
= 30.024 g
% yield = (actual/theoretical) x 100%
%yield = (26.1/30.024) x 100%
%yield = 86.93%
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.
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
#SPJ2
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.
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
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
Which is more dense:
(b)Oxygen or air?
Answer:
I think air is more denser than oxygen
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."
Finish this formula: Speed = _______ divided by time
Answer:
Distance
Explanation:
Speed= Distance/ Time
Answer:
Distance would be the answer! :)
i need help but the answer choice is (A. protists) (B.lichens) C. flagellates) (D.yeast )
Answer:
A
Explanation:
please mark me as brainlist and follów me too
Answer:
The Lichen Symbiosis
Lichens are made up of two or more closely interacting organisms, a fungus, and one or more partners, called photobionts. The photobiont may be an alga and/or cyanobacteria, both of which can produce simple sugars by photosynthesis.
Explanation:
Write down a question about yeast fermentation that can be answered through scientific investigation.
Explanation:
Alcoholic fermentation converts one mole of glucose into two moles of ethanol and two moles of carbon dioxide, producing two moles of ATP in the process. The overall chemical formula for alcoholic fermentation is: C6H12O6 → 2 C2H5OH + 2CO
Answer:
1. If you leave yeast fermentation out for 3 days what happens?
2. If you put yeast fermentation out in the sun will it still work?
Explanation:
These can be answered through scientific investigation.
:)))))))
How do you write the formula for a salt?
Answer:
NaCl (sodium chloride)Explanation:
...
What amount of ice must be added to 250 g of water at 15°c to cool the water to 0°c and have no ice left
Answer:
[tex]\mathbf{m= 47 \ g}[/tex]
Explanation:
The heat needed to melt ice [tex](q_1)[/tex] + heat needed to cool water [tex](q_2)[/tex] = 0
[tex]m\Delta H_{fusion} + mc \Delta T = 0[/tex]
[tex]m \times 333.55 J g^{-1} + 250 \ g \times 4.184 \ Jg^{-1 \ 0 } \times (-15.0 \ ^0 C) = 0[/tex]
[tex]m \times 333.55 J g^{-1} =15690[/tex]
[tex]m=\dfrac{15690 \ J }{333.55 J g^{-1} }[/tex]
[tex]\mathbf{m= 47 \ g}[/tex]
Calculate the mass of 3 moles of CCI4
Answer:
So one mole of ccl4 contains 152 grams. it implies that 3 moles of ccl4 contains 152 * 3 grams. it is equal to 456. grams.
Explanation:
Hope this helps
15. On some occassions, more than half of the moon is dark.
O
a. True
O b. False
Molecules are formed from ?
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.
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:
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!
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.
The name is As2S5 is?
Answer:
i dont no......
Explanation:
...........
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
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
