How many cesium atoms are in 21.9 grams?
Does changing the number of neutrons affect the atomic number?
Answer:
awsdxcvawsd
Explanation:
Answer:If you change the number of neutrons in an atom, you get an isotope of the same element. The addition of a neutron can make an atom radioactive. When you change the number of protons in an atom, you will change the atom from one element to a different element.
Explanation:
One of the uses of methanol (CH3OH) in dilute form is as a windshield washer antifreeze. In pure form, methanol has a molar concentration of 24.7M. How many moles are contained in 500 mL of solution?
Mole itself is the number of particles contained in a substance
1 mole = 6.02.10²³ particles
Mole : the ratio of the amount of substance mass and its molar mass
[tex]\large{\boxed{\boxed{\bold{mole=\frac{mass}{molar\:mass}}}}[/tex]
Molarity is a way to express the concentration of the solution
Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]
Molar concentration of methanol=24.7 M
Volume of solution = 500 ml = 0.5 L
[tex]\tt mol=M\times V\\\\mol=24.7\times 0.5\\\\mol=12.35[/tex]
(True or False) Only an odd number of orbitals is possible for any electron sublevel?
Answer:
The statement is true
I found this doing research.
Apparantly, each sub level is made up of one or more orbitals and the orbitals in each sub level are always odd number. Each orbital can only have two electrons and those two electrons will have opposite spin.
Explanation:
Answer:
True
Explanation:
Sciences Grad Bosch Law of Conservation of Mass - Assess it
contents
Target: 10/2001
Science and Enging
Achemical reaction takes place in a closed system. The mass of the reactants before the reaction was
55 watte mass of the products of the reaction be according to the law of conservation
Properties of Matter
Answer:
55
Explanation:
According to the law of conservation properties of Matter in a closed system the mass of reactants is equal to the mass of products. Because there is no lose of matter or energy in closed system
hello nice ppl(ɔ◔‿◔)ɔ ♥
Answer:
Hi
Explanation:
How has your brainly experience been so far? Are you liking?
Answer:
Thx you are sooo noice
Explanation:
UwU U3U
how do i know if they are congruent
In the apple activity you completed which of the following is an example of a constant
Answer: the type of apple because it is an example of a constant
Explanation:
Which of the following is the least likely to remain homogeneous?
. O A. All of these
O B. A supersaturated solution
O C. An unsaturated solution
O D. A saturated solution
Answer:
all
of them
Explanation:
HELP QUICK What is the mass of an object that has a volume of 2 ml and a density of 10g/ml?
Answer:
The answer is 20 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question we have
mass = 10 × 2
We have the final answer as
20 gHope this helps you
define atom and give an example
Answer:
Many atoms consist of a positively charged nucleus composed of protons and neutrons surrounded by a negatively charged cloud of electrons. At its most basic level, an atom is any particle of matter that contains at least one proton. ... Here are some examples of atoms: Neon (Ne) Hydrogen (H)
Explanation:
Burning 1 kg of coal releases about 3 million joules of energy. If you could use all of the chemical energy to lift another kilogram of coal, how high could you lift it?
I could lift 3.06 x 10⁵ m high
Further explanationEnergy is the ability to do work. Energy can change from one energy to another
Potential energy is the energy that an object has because of its position
The potential energy can be formulated:
Ep = m. g. h
E = potential energy of an object, joule
m = object mass, kg
g = gravity acceleration, m / s²
h = height of an object, m
energy of coal = 3.10⁶ J
mass = 1 kg
g = 9.8 m/s²
[tex]\tt h=\dfrac{E}{m.g}\\\\h=\dfrac{3.10^6}{1\times 9.8}=3.06\times 10^5`m[/tex]
Ben makes five paper helicopters with different wing lengths. He drops them the same way from a height of two meters for five trials each. He records the amount of time it takes for each helicopter to fall to the ground. What is the independent variable?
Answer:
Wing length
Explanation:
According to the given excerpt, independent variable is 'wing length' and dependent variable is 'amount of time it takes for helicopter to hit the floor'.
Independent variable refers to the variable that do not undergo any change or shift in the course of the experiment of research. The other variables are measured using the constant independent variable. The value obtained from the independent variable is independent. On the other and, the dependent variable witnesses change with respect to the independent variable.
For lunch you have a glass of sweetened ice tea. The glass contains crushed tea leaves, sugar, a slice of lemon, and both liquid and frozen water (ice cubes). Which of the following categories of matter best describes the contents of the glass? *
Answer:
I think solids
Explanation:
sorry if its not right
Quais são os três tipos de tecidos musculares? E)celulas,estriado esqueletico, estriado liso. B)esttiadi esqueletico, liso, estriado cardiaco c)estriado liso, estriado esqueletico, estriado cardíaco. D)liso, celulas, esteiado cardíaco. ESSA PERGUNTA E DE CIENCIAS MAS NAO TEM VIENCIAS ALI PRA ESCOLHER;-;.
Answer:
c)estriado liso, estriado esqueletico, estriado cardíac
Explanation:
Los 3 tipos de tejido muscular filho cardíaco, liso y esquelético.
O músculo esquelético é responsável pelo movimento dos tons e das outras estruturas. La contracción del músculo cardíaco permite que o corazón bombee sangre. Los músculos lisos permitem que os alimentos se muevan a través del tracto digestivo y también ayudan al cuerpo a absorvedor los nutrientes.
How is the nuclear structure of an atom similar to the non-nuclear structure?
Answer:
It has shells of protons and neutrons.
Explanation:
The nuclear structure of an atom is similar to the non-nuclear structure because has shells of protons and neutrons.
What is an atom?An atom consists of a central nucleus that is usually surrounded by one or more electrons.
The total number of neutrons plus protons in the same both before and after the nuclear process, although the total number of protons and the total number of neutrons may be different before and after.
Hence, the nuclear structure of an atom is similar to the non-nuclear structure because has shells of protons and neutrons.
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A brief explanation to this question: "Why are neon signs/fireworks different colors? Please help me. Do not look up internet
Answer:
when lit, the atoms of different chemical compounds inside the firework absorb energy, when the electrons fall back to lower energy levels, they give off colored light. Depending upon the chemical used, different colors are produced. neon lights or signs are glass tubes filled with neon gas. When the light is plugged in, the electrical energy causes the electrons of neon to jump to higher energy levels, when they go to lower levels, colored light is given off. The neat thing is that the neon never gets used up. The only thing that gets used up is the electricity. The electrons don't get destroyed and can be used over and over again jumping levels. Neon glows with an orange light, but you know that neon signs can be lots of different colors. The variations come when different gases other than neon are used such as argon, or krypton or when the tube is painted so that with the light produced it produces a certain color.
Explanation:
After being excited by high levels of electrical energy (as in neon signs) or heat energy, various elements and molecules will emit their own specific colors of light.
What are basis behind fireworks?Metals burn in a variety of colors. When a copper compound is lit, for example, the flame is blue-green.
Calcium burns red, while potassium burns purple. Metals are combined to produce various colors in fireworks.
The appearance of each firework is determined by the type of stars it contains, as well as the size and quantity of these pellets.
Some stars contain metal salts, which produce brilliant colors, while others contain a variety of chemical compounds that produce dazzling light effects such as strobing, sparkling, and others.
Various elements and molecules will emit their own specific colors of light after being excited by high levels of electrical energy (as in neon signs) or heat energy (as in the fireworks).
Thus, the neon signs or fireworks provide different colors.
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Line M passes through the points (-5, 9) and (-1,9).
12
10-
8
6
2
-12-10-8-6-4-22
2
6 8 10 12 X
6
-10
-12-
Which is true of line M?
Answer:
line m is vertical line with an undefined slopel line correct answer is 6 8 10 12 x
What is a graph?
A graph is a _______________________ representation of the relationship between two quantities.
_______________________ variable (manipulated)
Controlled by experimenter
_______________________________ variable (responding)
Something we observe as the result of the experiment
*Visual
*Independent
*Dependent
10.0 J of energy is required to increase the temperature of 1 g of water by 10oC. What is this value in calories? In kcal?
10 J = 2.39 cal = 2.39 x 10⁻³ kcal
Further explanationThe joule is one unit of energy. energy itself can be expressed in units such as calories, BTU, kg⋅m²s⁻²
An example of energy calculation is the calculation of heat in heat transfer
Heat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
10 J if we convert into calories and kcal
[tex]\tt 1~J= 0.239~cal\\\\10~J=2.39~cal\\\\2.39~cal=2.39\times 10^{-3}~kcal[/tex]
HELP PLEASEE
Name three elements present in the ingredients of the cereal drink which are not listed in the nutrition facts
Answer:
Let's start with the fact that cereals , are made of grains and are mostly carbohydrates. therefore they contain carbon oxygen and hydrogen. They also contain proteins so have nitrogen. Plants have the minerals that are in the soil where they grow, so the list you have is correct. They also generally have added vitamins ad minerals. The vitamins contain C, H, O N, and a few others such as sulfur, The added minerals might contain:copper, iron, zinc, cobalt, selenium, silicon and molybdenum .
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The three elements present in the ingredients of the cereal drink which are not listed in the nutrition facts are Iron, Calcium, and Zinc
Cereals are monocotyledonous grass crops cultivated annually for the purpose of consumption. They are rich in fiber and energy. Examples of them include;
maize, barley, wheat, oat, rye, etc.Cereal drinks are processed drinks extracted from cereal crops through fermentation. They are rich in nutrients as they contain important sources of carbohydrates, dietary protein, and vitamins.
The ingredients present in a cereal drink are composed of essential elements such as:
copper, cobalt, iron, zinc, molybdenum, iodine, chromium, and selenium.Some of which are not listed in the nutrition facts are Iron, Calcium, and Zinc.
Therefore, we can conclude that the elements present in the ingredients of the cereal drink which are not listed in the nutrition facts can be Iron, Calcium, and Zinc.
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The number of shovels and cost per 1000 kg for
Ca(OH)2
Answer:500
Explanation:
As part of a chemistry experiment, Sam notes that the temperature at which liquid mercury
freezes into a solid is -102 Fahrenheit (F). The beaker of liquid mercury provided to him Is
at a room temperature of 68". By how many degrees will Sam have to cool the liquid
mercury for it to freeze into a solid?
-102"F
-34°F
102°F
170°F
o
Answer:
-34¨F
Explanation:
A skittish squirrel is climbing vertically on a tree. Its
motion is shown on the following graph of vertical
position y vs. time t.
6
5+
3
2+
1
→t(s)
2
3
4
5
6
7
8
9
What is the instantaneous speed of the squirrel at time
t=2 s?
Answer: 1
Explanation:
Answer:
-0.1
Explanation:
11. How many moles are in 7.14 X 10 35
molecules of 02?
Answer:
The answer is 1.186 × 10¹² molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
N = 7.14 × 10^35 molecules of O2
We have
[tex]n = \frac{7.14 \times {10}^{35} }{6.02 \times {10}^{23} } \\ [/tex]
We have the final answer as
1.186 × 10¹² molesHope this helps you
When copper is bombarded with high-energy electrons, X rays are emitted. Calculate the energy (in joules) associated with the photons if the wavelength of the X rays is 0.154 nm.
Answer:
E = 12.92 × 10^(-16) J
Explanation:
Formula for energy is;
E = hc/λ
Where;
h is Planck's constant = 6.63 x 10^(-34) J.s
c is speed of light = 3 × 10^(8) m/s
λ is wavelength = 0.154 nm = 0.154 × 10^(-9) m
E = (6.63 x 10^(-34) × 3 × 10^(8))/(0.154 × 10^(-9))
E = 12.92 × 10^(-16) J
The energy associated with the photons of X rays with a wavelength of 0.154 nm is 1.29 × 10⁻¹⁵ J.
When copper is bombarded with high-energy electrons, X rays, with a wavelength of 0.154 nm (λ) are emitted.
We can calculate the energy (E) associated with the photons of these X rays using the Planck-Einstein relation.
[tex]E = \frac{h \times c }{\lambda } = \frac{(6.63 \times 10^{-34}J.s ) \times (3.00 \times 10^{8}m/s ) }{0.154 \times 10^{-9} m } ]= 1.29 \times 10^{-15} J[/tex]
where,
h: Planck's constantc: speed of lightThe energy associated with the photons of X rays with a wavelength of 0.154 nm is 1.29 × 10⁻¹⁵ J.
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How much heat is required to melt 42.0 grams of water at 0*C?
Hurry...
Answer:
Heat required to melt 42 g if ice is 13,860 J
Explanation:
The amount of heat required to melt grams of water at 0°C is given as follows;
The mass of the ice (water), m = 42 g
The latent heat of fusion of ice Δ[tex]H_f[/tex]= 330 J/g
Therefore, heat required to melt 42 grams is given as follows;
Heat required to melt ice = Mass of the ice, m × The specific latent heat of fusion of the ice, Δ[tex]H_f[/tex]
Heat required to melt 42 g if ice = m × Δ[tex]H_f[/tex] = 42 g × 330 J/g = 13,860 J
Heat required to melt 42 g if ice = 13,860 J.
Please help me with this I’ve been on this question for 10 minutes now...
Answer:
A
Explanation:
we know that pangea was when all the continents were connected and the tectonic plates moved, causing pangea to split into multiple pieces. so north america was formed by moving tectonic plates.
i hope this helps :))
1.why does gravity exist?
2.what does the strength of gravity on?
3.what will have stronger force of gravity, jupiter or earth ?
This class is science !!
Answer:
Gravity exists because elementary particles (electrons, quarks, and neutrinos), are NOT static with time and expansion. Matter is dynamic; elementary particles must continually accrete energy (the quanta of space) in order to conserve the continually increasing angular momentum of the expanding universe.
Strength of gravity
9.80665 m/s 2
Jupiter
Determine how you would prepare 220 mL of a 0.500 M potassium hydroxide solution starting with: a) solid potassium hydroxide b) a 1.25 M potassium hydroxide solution
Answer:
a) 6.17 g of solid KOH
b) 88.0 mL of a 1.25 M potassium hydroxide solution
Explanation:
a) We have to determine the mass of solid potassium hydroxide that has to be weighed to prepare 220 mL of a 0.500 M potassium hydroxide solution. We will also require the molar mass of potassium hydroxide, KOH, 56.11 g/mol.
0.220 L × (0.500 mol/L) × (56.11 g/mol) = 6.17 g
b) We will use the dilution rule to determine the volume of the 1.25 M potassium hydroxide solution to be measured.
C₁ × V₁ = C₂ × V₂
V₁ = C₂ × V₂ / C₁
V₁ = 0.500 M × 220 mL / 1.25 M = 88.0 mL