Answer:
The function of the cathode ray tube is to convert an electrical signal into a visual display. Cathode rays or streams of electron particles are quite easy to produce, electrons orbit every atom and move from atom to atom as an electric current.
In the periodic table, elements that have similar properties are grouped in horizontal rows.
True or False?
your answer is False because they elements in the same period row have different properties of the Elements in a same group column have similar properties
What happens to the coefficients in a reaction when writing the equilibrium constant expression?
A. They become exponents in the equilibrium constant expression
B. They disappear
C. They become multipliers in the equilibrium constant expression
D. They become coefficients in the equilibrium constant expression
Answer:
D
Explanation:
They become coefficients in the equilibrium constant expression
They become coefficients in the equilibrium constant expression. Hence, option A is correct.
What is equilibrium constant expression?At equilibrium, the relationship expressed between the amounts of concentration of products and reactants in a reversible chemical reaction is known as the equilibrium constant.
Consider the equation below:
aC + bD <=> eF
Where
C and D are reactants
F is the product
a, b and e are coefficients
Thus the equilibrium constant (K) is written as follows:
K =[tex][F]^e[/tex] / [tex][C]^a[D]^b[/tex]
From the above illustration, we can see that the coefficients are exponent in the equilibrium constant expression.
Thus, we can conclude that the correct answer to the question is Option A. They become exponents in the equilibrium constant expression.
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Which of these is the smallest particle to retain the properties of an element?
Group of answer choices
a molecule
an electron
a proton
an atom
Answer:
A molecule
Explanation:
Because that is what I think ^^~
HELP!!!!!
Find the volume of a gas at STP (STP is 0oC and 1atm), if its volume is 80.0 mL at 109 kPa and –12.5oC.
(I will give brainliest. Thank you so much!)
Answer:
90.6 mL.
Explanation:
Recall the ideal gas law:
[tex]\displaystyle PV = nRT[/tex]
Where P is the pressure; V is the volume; n is the number of moles of gas; R is the universal gas constant; and T is the absolute temperature.
Because only P, V, and T changes, we can rearrange the equation to:
[tex]\displaystyle \frac{PV}{T}= nR[/tex]
The right-hand side is some constant. In other words:
[tex]\displaystyle \frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}[/tex]
The initial measurements are 109 kPa, -12.5 °C, and 80.0 mL.
Convert kPa to atm:
[tex]\displaystyle 109\text{ kPa} \cdot \frac{1\text{ atm}}{101.3 \text{ kPa}} = 1.08\text{ atm}[/tex]
And convert temperature to kelvins:
[tex]\displaystyle T_k = (-12.5) + 273.15 = 260.6\text{ K}[/tex]
STP is given by 1 atm pressure and 0 °C (273.15 K). Hence, substitute:
[tex]\displaystyle \frac{(1.08\text{ atm})(80.0\text{ mL})}{(260.6\text{ K})} = \frac{(1\text{ atm})V_2}{(273.15\text{ K})}[/tex]
Solve for volume:
[tex]\displaystyle V_2 = 90.6\text{ mL}[/tex]
In conclusion, the volume of the gas at STP is 90.6 mL.
Check: Volume is indirectly proportional to pressure and directly proportional to temperature. Because we decreased the pressure (1.08 atm to 1.00 atm) and increased the temperature (260.6 K to 273.15 K), we should expect an overall increase in volume.
Student
# Hours
Student
# Hours
Twenty students were surveyed to find out how
many hours of TV they watch during a school
week. The results are shown to the right. Answer
the following questions and round your answers to
the nearest half hour.
1
2
11
4
2.
5
12
1
3
3
13
2.
The mode of the data is I hours.
4
5
14
6
DONE
5
1
15
2
6
4
16
3
7
6
17
10
8
12
18
10
9
2
19
8
10
6
20
7
Does it is a complete qwestion? It
is not clearef
the first one is "5" and "4.5"
the second one is "2" and "11"
then after that the multiple choice one is "mean" and "median" in other words A and B
your welcome
What is the molecular formula of a compound with an empirical formula of CFBrO and a molar mass of 254.7 grams per mole?
The molecular formula of a compound with an empirical formula of CFBrO and a molar mass of 254.7 grams per mole is C₂F₂Br₂O₂.
What is molecular formula ?Chemical element symbols, numbers, and occasionally additional symbols like parentheses, dashes, bracket, commas, and plus and minus signs are used in a chemical formula to represent information about the chemical proportions of the atoms that make up a certain chemical compound or molecule.
A molecule's molecular formula reveals which atoms and how many of each kind are included inside it. No subscript is used if there is just one atom of a certain kind. A subscript is added to the symbol for an atom if it contains two or more of a certain type of atom.
Its original definition, "the smallest unit of a material that yet preserves the qualities of that substance," was intended to be included by this designation.
Thus, The molecular formula of a compound with an empirical formula of CFBrO and a molar mass of 254.7 grams per mole is C₂F₂Br₂O₂.
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PLEASE HELP
Use the periodic table to determine which of the following could be an isotope of bromine (Br). Check all that apply.
Z = 79, A = 196
Z = 35, A = 79
A = 79, N = 44
Z = 44, N = 44
Explanation:
The answer is:
z=35,A=79
and also
A=79,N=44
According to the statements of the question, atoms Z = 35, A = 79 (option B) and A = 79, N = 44 (option C) are isotopes of bromine.
Isotopes are atoms from the same element which has a different number of neutrons in their nucleus.
Bromine has an atomic number (Z) of 35 and an atomic mass (A) of 80. The number of neutrons of this atom is:
[tex] A = Z + N [/tex]
[tex] N = A - Z = 80 - 35 = 45 [/tex]
For an element to be an isotope of bromine, it must have the same Z (35) and a different value of N.
From the given options, the only one that has the same atomic number is option B (Z = 35, A = 79).
The number of neutrons of this isotope is:
[tex] N = A - Z = 79 - 35 = 44 [/tex]
Hence, option B is an isotope of bromine.
Option C is also an isotope because it is the same as option B, the number of neutrons is 44 and the atomic mass is 79. So, this isotope is the same as option B.
The other options, A (Z = 79, A = 196) and D (Z = 44, N = 44), are not isotopes of bromine because they are different elements, gold (Au) and ruthenium (Ru), respectively.
Therefore, options B and C are isotopes of bromine.
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HELP
which listed elements would form metallic bonds? Check all that apply
- Bi
- Xe
- I
- Ag
- Li
Answer:
Bi (Bismuth)
Ag (Silver)
Li (Lithium)
Explanation:
Xe (Xenon) and I (Iodine) are non-metals. They cannot from a metallic bond because metallic bonds are bonds between metals only.
24 g of sodium chloride at 25 °C are mixed with 272 g mercury at 50 °C. Find the
system's final temperature.
Answer:
the correct ans
Explanation:
The quantitative amount of energy that is necessary to provide to a substance whose temperature has to be increased is depicted as heat capacity. When the temperature is changed by one degree Celsius and the amount is fixed to one gram, then the heat capacity is depicted as specific heat capacity.
elements in the alkali metals tend to make ions with a charge of
Answer:
I believe the answer is positive ions :/
Plz help! I don't want internet answers plz :D
1. What determines weight?
2. What does Homogeneous mean?
9) A solid magnesium flare has a mass of 2300 g and a volume of 703 cm3. What is the density of the
g
magnesium?
Answer:
siks creo que creo que siks
What was the first animal on the endangered species list?
bald eagle
Great white shark
Saber tooth tiger
humpback whale
Answer:
Saber tooth tiger
Explanation:
Saber tooth tiger is pretty dangerous and around the world are few meaning were killed
Scientific theories are usually
A.
unable to change as new data or technology emerges.
B.
supported by evidence and widely accepted by the community.
C.
based on opinions and feelings.
D.
claims posed by individuals.
Answer:
B
Explanation:
Cuz they are supported once discovered and then widely spread then accepted
Answer:
B.
Explanation:
A scientific theory is a broad explanation that is widely accepted because it is supported by a great deal of evidence. Because it is so well supported, a scientific theory has a very good chance of being a correct explanation for events in nature. Because it is a broad explanation, it can explain many observations and pieces of evidence. In other words, it can help connect and make sense of many phenomena in the natural world.
How many atoms does the formula 2HgO have?
Answer:
4
Explanation:
2HgO
2 * 1 Hg atom = 2 Hg atoms
2 * 1 O atom = 2 O atoms
2+2 = 4 atoms total
How do I balance _Zn+_HCl➡️_ZnCl_+H2
Answer:
Zn+2HCL➡️ZnCl2+H2
Explanation:
1 zn+ 2 hcl ➡️ 1 zn +2cl and 2 hcl(2hcl)
what is the molarity (M) of cobalt (II) nitrate?
Answer:
182.94 g/mol is the correct
Explanation:
hope this helps
Answer:
Your answer would be:
182.94 g/mol
Explanation:
Have a great rest of your day
#TheWizzer
1.
How much of the radiation from the sun reaches Earth’s surface?
50%
25%
70%
100%
2.
Which method of heat transfer is responsible for a person burning their hand on a stove?
convection
conduction
radiation
thermal energy
3.
Why is noon not the hottest part of the day if the sun is directly overhead?
The ground absorbs the solar radiation and releases it throughout the later afternoon.
The solar radiation is more direct at later times in the day.
The cloud cover at noon prevents solar radiation from reaching Earth’s surface.
The ground continues to absorb radiation until the sun goes down and releases it all at night.
4.
Which stage of the water cycle occurs when water vapor exits plants through their leaves?
transpiration
evaporation
condensation
precipitation
5.
Identify the method of heat transfer responsible for warm air masses rising, then cooling and condensing.
convection
radiation
thermal energy
conduction
6.
Identify the type of cloud that is associated with thunderstorms, hail, heavy rains, lightning, and tornadoes.
cirrostratus
cumulonimbus
altostratus
stratocumulus
7.
Earth’s albedo determines which of the following properties?
reflectivity of Earth’s atmosphere
reflectivity of Earth’s surface
amount of solar radiation that passes through the atmosphere
amount of heat absorbed by clouds
8.
What is the relationship between temperature and air pressure?
As temperature increases, air pressure increases.
As temperature increases, air pressure decreases.
There is no relationship between temperature and air pressure.
As temperature decreases, air pressure decreases.
9.
Identify the layer of the atmosphere that protects Earth from meteors.
troposphere
stratosphere
thermosphere
mesosphere
10.
What factors affect global winds?
jet streams, Hadley cells, and trade winds
Hadley cells, pressure belts, and the Coriolis effect
convection cells, pressure belts, and the Coriolis effect
convection cells, polar westerlies, and the greenhouse effect
11.
Which method of heat transfer do you experience when you put your hands near a fire and feel the warmth?
thermal energy
convection
radiation
conduction
12.
Which of the following choices is not a particulate that is found in the atmosphere?
water vapor
pollen
dirt
ash
13.
Which phenomenon is responsible for the blue color of the sky?
scattering
albedo
absorption
radiation
14.
Which layer of the atmosphere is the hottest layer?
thermosphere
troposphere
stratosphere
mesosphere
15.
Answer the question below.
Compare and contrast the four main types of clouds and the weather they indicate. Use details to support your answer.
16.
Which phenomena causes Earth’s winds to deflect as they move around the globe?
the Coriolis effect
the tradewinds
the greenhouse effect
uneven solar heating
17.
Which factor does not affect the amount of solar radiation that an area receives?
the location’s latitude
the time of year
the cloud cover in the area
the sun’s temperature
18.
Which type of cloud is associated with fair weather and appears long and wispy?
cumulus
stratus
alto
cirrus
19.
The rise of oxygen in the atmosphere allowed which of the following to form?
iron ores in the crust
cyanobacteria
UV radiation
the ozone layer
20.
Answer the question below.
Explain how global winds are created. Use details to support your answer.
21.
Which gas makes up the largest percentage of the atmosphere?
oxygen
methane
water vapor
nitrogen
22.
Identify the hypothesis that early life arose from organic compounds forming in the atmosphere because of the combination of gases present and lightning.
the Miller-Urey hypothesis
the Oparin-Urey hypothesis
the meteorite hypothesis
the Oparin-Haldane hypothesis
23.
Which example below would not be found on primitive Earth?
volcanoes
lightning storms
ammonia gas
oxygen gas
24.
Which type of cloud indicates that rain, snow, or thunderstorms are on the way?
cirrus
stratus
alto
cumulus
25.
How is absolute humidity measured?
It determines the mass of oxygen in a volume of air.
It determines the mass of water in a volume of air.
It determines the ratio of water in a volume of air to the total amount that the volume of air can hold.
It determines the percent of water vapor in the air.
I will mark brainliest.
Answer:
1) 70
2) conduction
3) The ground absorbs the solar radiation and
releases it throughout the later afternoon.
4) transpiration
5) convection
6) cumulonimbus
7) reflectivity of Earth’s surface
8) As temperature increases, air pressure
increases.
9) thermosphere
10) convection cells, pressure belts, and the
Coriolis effect
11) radiation
12) pollen
13) scattering
14) thermosphere
15) The different types of clouds are:
cumulus: Cumulus clouds are clouds which have flat bases and are often described as "puffy", "cotton-like" or "fluffy" in appearance. Their name derives from the Latin cumulo-, meaning heap or pile.
cirrus: Cirrus is a genus of atmospheric cloud generally characterized by thin, wispy strands, that typically appear white or light grey. The name is derived from the Latin word cirrus, meaning 'ringlet' or 'curling lock of hair'. Such a cloud can form at any altitude between 5,000 and 13,700 m above sea level.
stratus: Stratus clouds are low-level clouds characterized by horizontal layering with a uniform base, as opposed to convective or cumuliform clouds that are formed by rising thermals.
nimbus: Nimbostratus clouds are dark, grey, featureless layers of cloud, thick enough to block out the Sun and produce persistent rain. Height of base: 2,000 - 10,000 ft. Shape: Bands or areas of individual cells. Latin: nimbus - rainy cloud; stratus - flattened or spread out. Precipitation: Continuous rain or snow likely.
16) the tradewinds
17) the location’s latitude
18) Cirrus clouds
19) the ozone layer
20) Global winds are created by both the spin of
the Earth (Coriolis effect) and the differences
in temperature between the equator and
the polar areas. These winds are often
grouped together as trade winds, easterlies,
and westerlies.
21) nitrogen
22) the Miller-Urey hypothesis
the Oparin-Haldane hypothesis
23) ammonia gas
24) cumulus
25) It determines the mass of water in a volume of air
Explanation:
please please please mark me as brainliest
HELP PLEASE!!!!!!!!!
Answer:
the answer is letter D
Explanation:
I hope you like it my love
please can someone tell me the answer and explain
11
A 1 mole sample of hydrogen gas has the same number of hydrogen atoms as a 2 mole
sample of water molecules (H20).
Answer:
what is the question in this case
The number of atoms in one mole of hydrogen is 6.022 × 10²³. 2 moles of water contains 4 moles of hydrogen thus, 1.2 × 10²⁴. Hence, the statement is false.
What is one mole?Any substance containing 6.022 × 10²³ number of atoms is called one mole of the substance. This number is called Avogadro number. Therefore one mole of every elements contains Avogadro number of atoms.
Thus, one mole of hydrogen gas contains 6.022 × 10²³ H₂.
One mole of water contains 6.022 × 10²³ water molecules. One water molecule is made of two hydrogens and one oxygens. One mole of water contains 6.022 × 10²³ molecules.
Therefore, two moles of water contains 2 × 6.022 × 10²³ = 1.2 × 10²⁴ H₂ Therefore, the number of hydrogen atoms in one mole of H₂ gas and two moles of water are not equal.
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What is an energy level? Apex
Answer:
An energy level is the average distance of an electron from the nucleus. 01 ...
Answer:
The energy possessed by an electron at a set distance from the nucleus.
Explanation:
Word for word (apex)
Which element has chemical properties that are most similar to the chemical properties of sodium?
Answer:
Lithium
Explanation:
So, the elements with similar properties to sodium (Na) are all of those elements in the same Group. The ones "most" similar would be the ones closest in mass as well. Those would be Lithium (Li) and Potassium (K)
How many grams of FeS are formed from 7.62g of Fe reacted with excess S?
Answer:
12.2g
Explanation:
I took the quiz :)
Calculate the wavelength (m) of light that has a frequency of 2.17 x 10^11 s-1
please help !!
Answer: I’m guessing ibhs and mr Kadda right?
Explanation:I’m stuck too
please help me
law of conservation of matter facts or characteristics explain in your own words
I agree with the above answer.
How many g of CO2 is made from 5.75 g
of NaHCO3?
Explanation:
the answer of this question is 1.5 grams CO2
A weather balloon containing 59.5 L of helium is released at sea level, where the atmospheric pressure is 101.3 kPa. When it gets to an altitude of 4000 m above sea level, the pressure is only 61.7 kPa. What volume will the balloon now occupy, assuming the temperature is the same?
Pls SHOW WORK
Answer:
V2 = 97.7 L
Explanation:
The solve this question, we need to follow the equation below
P1V1 = P2V2
V1 = 59.5L
P1 = 101.3 kPa (because 1 atm equals 101.3 kPa so this one we don't have to do anything) = 1 atm
P2 = 61.7 kPa (must be converted to atm by dividing by 101.3) = 0.609 atm
V2 = ?
P1V1 = P2V2
1 x 59.5 = 0.609 x V2
59.5 = 0.609 x V2
(Dividing both sides by 0.609 to get rid of it)
V2 = 97.7 L
Need help im kinda stuck ;-;
Answer:
the answer is the third figure from left
Which of the following could occur as a result of
decreasing the heat energy of a gas?
A. condensation
B. evaporation
C. radiation
D. vaporization
Answer:
A
Explanation:
Because, condensation occurs due to the drop in the temperature of the gas therefore turning into liquid.