Answers
Answer:
5
Explanation:
The atomic number is the number of protons in an atom. Protons are the positively charged particles in the nucleus. The number of protons define the identity of an element. An element with 5 protons is Boron, no matter how many neutrons may be present.
The atomic number of the atom shown in the diagram is 5.
What is the atomic number?The atomic number of an element refers to the number of protons in the nucleus of its atoms. It uniquely identifies an element and determines its chemical properties.
In the diagram, there are 5 proton numbers in the nucleus of the atom. In other words, this means that the atomic number of the atom is 5.
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Related Questions
Suggest a way that a scientist could create an even more accurate model of universe expansion
Answers
Answer:
Between galaxies, retake the measurement.
Explanation:
Among both galaxies, reiterate the measurements. Instead of utilising a balloon, a scientist might create a model that shows in which everything really is and how cosmos is expanding rather than expanding. By inflating up the atmosphere to 1/2, 3/4, and full size, continue the operation.
How many electrons are in an ion of sulfur (82)?
The Periodic Table
O A. 2
B. 16
O
C. 8
D. 18
Answers
Answer:
B 16
Explanation:
the atomicnumber =protons of the atom =electrons do keep in mind that they are charged negatief
which one of the following is not a mixture?Air,mercury ,milk,cement
Answers
mercury is not a mixture it is a element
Answer:
mercury
Explanation:
what is meant by reactive elements
Answers
Answer; relative elements are most reactive elements and compounds may ignite spontaneously or explosively. They generally burn in water as well as the oxygen in the air
Explanation:
Answer:
Reactive elements are the elements which are ready to gain electrons because they have incompletely filled outermost shell.
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Assertion: Atomic mass of aluminium is 27 Reason: An atom of aluminium is 27 times heavier than 1 / 12th of the mass of the C – 12 atoms.
Answers
Answer:
i is the correct answer.
Explanation:
the RAM of aluminum is indeed 27. And since the RAM of substances are measured in terms of the C-12 isotope then R indeed explains why the RAM Al is 27.
Arrange the steps in order to describe how photons and carbon dioxide (CO2) contribute to the warming of Earth.
CO2 in the atmosphere absorbs infrared
photons.
CO2 in the atmosphere emits infrared photons back toward Earth.
Photons from the Sun strike Earth and become infrared photons.
Earth radiates infrared photons into the atmosphere
The Sun radiates sunlight (visible)
photons
Answers
The Sun radiates sunlight (visible) photons
Photons from the Sun strike Earth and become infrared photons.
Earth radiates infrared photons into the atmosphere
CO2 in the atmosphere absorbs infrared photons.
CO2 in the atmosphere emits infrared photons back toward Earth.
Certain gases are known to contribute towards global warming. Such gases are called greenhouse gases. The infrared rays from the sun are absorbed by these gases as they are re-emitted from the earth and re-emitted.
The sun radiates photons to the earth which is re-radiated into outerspace from the earth's surface. CO2 and other greenhouse gases absorbs these gases and re-emit them to the earth thereby causing a gradually rise in the temperature of the earth called global warming.
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Jane wants to study how a person's heart and lungs respond to intense
exercise. She measures the heart rate and breathing rate of 10 people before,
during, and after a 5K race. Which body systems is she studying?
A. Cardiovascular and respiratory
B. Skeletal and urinary
C. Digestive and nervous
D. Muscular and reproductive
SUBMIT
Answers
Câu 1: Trong các dung dịch sau, dung dịch nào làm quỳ tím đổi màu xanh?
A. HCl B. H2SO4 C. NaOH D. NaCl
Câu 2: Bazơ nào dưới đây là bazơ không tan?
A. KOH B. NaOH C. Cu(OH)2 D. Ca(OH)2
Câu 3: Trong các chất sau đây, chất nào không phải là muối?
A. HCl B. KCl
Answers
C. NaOH
C. Cu (OH)
A. HCl
Aniline involves an amine, which is a Choose... functional group. When an aqueous acid solution is added to an organic solution including aniline, the aniline appears in the Choose... layer in its Choose... form. Then, a base is added to Choose... the aniline.
Answers
Answer:
Basic
Aqueous
Protonated
Reconstitute
Explanation:
Aniline contains the -NH2 group in which the hydrogen atom bears a lone pair of electrons which is capable of accepting a proton hence aniline is basic.
This lone pair makes it possible for aniline to be protonated to yield an ionic substance which enters into the aqueous phase.
Addition of a base leads to the reconstitution of the aniline.
UM UM UM HELP AGAIN. which of the following would increase the pressure of a gas
a. letting out air of an air mattress
b. taking a breath of air
c. lying on an air mattress
d. throwing a balloon into the air
Answers
Answer:
I think c) laying on an air mattress
3g of clean mg ribbon and 8g of clean copper metal was burnt separately in equal volume of air and both mass reacted completely with air state and explain where they was greater change in mass??
Answers
Answer:
gshshs
Explanation:
bshsjskskehhshs
The copper metal is heated in the air. The magnesium ribbon emits a brilliant light and magnesium oxide, which is white. When oxygen is passed over copper (in the presence of heat), an oxidation reaction occurs, resulting in the formation of black copper oxide. The greater change in mass observed when they start to burned.
What is copper metal ?Copper is a mineral and an element that is essential to our daily lives. It is a significant industrial metal due to its high ductility, malleability, thermal and electrical conductivity, and corrosion resistance. It is a necessary nutrient in our diet.
Metals are a class of materials that have high electrical and thermal conductivity, as well as malleability, ductility, and high light reflection. Copper (Cu), aluminium (Al), and other metals are examples.
The combustion of magnesium ribbon is a combined reaction. This is due to the fact that magnesium reacts with oxygen to form the single product magnesium oxide. When magnesium ribbon is burned in air, it reacts with the oxygen in the air to form magnesium oxide.
Thus, 3g of clean mg ribbon and 8g of clean copper metal were burnt separately in equal volume of air and both mass reacted completely with air the greater change in mass observed when they start to burned.
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Aluminum hydroxide containing medicine is used for gastric why
Answers
Answer:
Aluminum Hydroxide, Magnesium Hydroxide are antacids used together to relieve heartburn, acid indigestion, and upset stomach. They may be used to treat these symptoms in patients with peptic ulcer, gastritis, esophagitis, hiatal hernia, or too much acid in the stomach (gastric hyperacidity).
Answer:
wow it's a very nice question
3. Determine the pH value for calcium hydroxide, Ca(OH), with concentration of
0.05 mol dm3. [pH + pOH = 14).
Answers
Explanation:
Ca(OH) is a base
pOH = -Log[OH]
[OH] = 0.05
pOH = -Log(0.05)
pOH = 1.3
pH + pOH = 14
pH = 14 - pOH
pH = 14 - 2
pH = 12.7
What is the shape around each carbon atom in ethylene, H C CH ? The represents a double bond.
linear
trigonal planar
V shaped
tetrahedral
trigonal pyramidal
bent
Answers
Answer:
I'm not 100% sure,but I think its trigonal pyramidal
Which factor would speed up a chemical reaction? (Choose all that apply)
Decreasing particle size
Increasing the temperature
Decreasing the temperature
Increasing particle size
Answers
Answer:
Increasing the temperature
Increasing particle size
Explanation:
Increasing the temperature allows for particles and molecules to move faster (because there is an increase in energy) and allows for more collisions.
∴ Increasing the temperature would be an answer.
Increasing the particle size allows for more surface area and a greater chance for particles to collide with each other.
∴ Increasing particle size would be an answer.
Topic: AP Chemistry
Unit: Kinetics
For each pair (4), choose the stronger bond:
1. H–F (single bond) or H–Cl (single bond)
2. C–C (single bond) or C=C (double bond)
3. F–F (single bond) or H–F (single bond)
4. O=O (double bond) or C=C (double bond)
Answers
Answer:
line 3
Explanation:
let me know if you have any questions
What unusual physical property does liquid sulfur exhibit from about 113∘C to 230∘C? Select the correct answer below: A. Its vapor pressure decreases with increasing temperature. B. Its vapor pressure increases with increasing temperature. C. Its viscosity decreases with increasing temperature. D. Its viscosity increases with increasing temperature.
Answers
Answer:
C. Its viscosity decreases with increasing temperature
Explanation:
The liquid Sulphur is a liquid that turs yellowish green. At a temperature of 120 it tends to melt and has a lower viscosity.A 100 g sample of potassium chlorate, KCIO3(s), is completely decomposed by heating:
2 KCIO3(s) 2 KCl(s) + 3 O2(g)
The oxygen is collected at 89 kPa and 23°C. Calculate the volume, in litres, of oxygen that would be
produced during the decomposition of this sample.
Answers
In order to be able to calculate the volume of oxygen gas produced by this reaction, you need to know the conditions for pressure and temperature.
Since no mention of those conditions was made, I'll assume that the reaction takes place at STP, Standard Temperature and Pressure.
STP conditions are defined as a pressure of
100 kPa
and a temperature of
0
∘
C
. Under these conditions for pressure and temperature, one mole of any ideal gas occupies
22.7 L
- this is known as the molar volume of a gas at STP.
So, in order to find the volume of oxygen gas at STP, you need to know how many moles of oxygen are produced by this reaction.
The balanced chemical equation for this decomposition reaction looks like this
2
KClO
3(s]
heat
×
−−−→
2
KCl
(s]
+
3
O
2(g]
↑
⏐
⏐
Notice that you have a
2
:
3
mole ratio between potassium chlorate and oxygen gas.
This tells you that the reaction will always produce
3
2
times more moles of oxygen gas than the number of moles of potassium chlorate that underwent decomposition.
Use potassium chlorate's molar mass to determine how many moles you have in that
231-g
sample
231
g
⋅
1 mole KClO
3
122.55
g
=
1.885 moles KClO
3
Use the aforementioned mole ratio to determine how many moles of oxygen would be produced from this many moles of potassium chlorate
1.885
moles KClO
3
⋅
3
moles O
2
2
moles KClO
3
=
2.8275 moles O
2
So, what volume would this many moles occupy at STP?
2.8275
moles
⋅
22.7 L
1
mol
=
64.2 L
what is chemical formula of water ? how it is composed
Answers
Answer:
H2O
Explanation:
it is composed of 2 atoms of Hidro and 1 atom Oxy
Answer:
The chemical formula for water is H2O..it is composed by the bonding of 2 molecules of hydrogen and one molecule of oxygen,a covalent bond to be specific.
I hope this helps
You go fishing and obtain some lead weights for your trip. Since you are the smartest chemistry student
in the land, you know that lead's density is 11.34 g/mL. If there are 50 weights in a 250. mL box, what is
the mass of each weight?
Pls show work if u can!
Answers
Answer:
56.7g
Explanation:
Density = mass/volume
According to this question, some lead (Pb) of certain weights was obtained on a fishing trip. The density of lead is given as 11.34g/mL. If the 50 weights are placed in a 250. mL box, the mass of the lead are as follows:
Density = mass ÷ volume
11.34g/mL = mass/250mL
mass = 250 × 11.34
mass = 2835g
Since the 50 weight of lead weighs 2835g, then the mass of each weight is calculated as follows:
= 2835/50
= 56.7g
What are the characteristics of ionosphere?
Answers
Explanation:
The ionosphere is a shell of electron and electrically charged atoms and molecular that surrounds, the earth.
breaking larger molecules into smaller molecules and carbon
Answers
Answer: catabolism
Explanation:
Catabolism refers to the set of metabolic pathways which is necessary for the breaking down of molecules into smaller units. This is then oxidized for the release of energy or can be used to perform other anabolic reactions.
Catabolism is regarded as the opposite direction of anabolism which is simply the building-up of molecules. It should be noted that anabolism and catabolism work together in every living organisms and perform functions such as the production of energy and the repair of cells.
2HNO3+ Cu O -> Cu (NO3)2 + H₂O
Answers
Answer:
it is already balanced bro
hii pls help me to balance the equation thanksss
Answers
▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓
[tex]\pmb{\red{\boxed{\sf{Na_{2}O(s)+H_{2}O(l)\dashrightarrow 2NaOH(aq) }}}}[/tex]
▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓
****URGENT****
I need help!!!
the answers are there, i need someone to explain please!
Answers
Explanation:
your answer was correct
(a) How many significant figures should be reported for
the volume of the metal bar shown below? (b) If the
mass of the bar is 104.7 g, how many significant figures
should be reported when its density is calculated using
the calculated volume? [Section 1.5]
Answers
The number of significant figures will be four (4)
cual es la importancia de los solidos en la vida ?
Answers
Answer:
La comida es un sólido y no podemos vivir sin comida. Algunos sólidos son buenos conductores de calor y electricidad; otros son aislantes. Los sólidos se utilizan todos los días en la vida.
Which statement describes the periodic law?
Help please now!
Answers
Answer:
Answer is: elements in the same group have similar chemical properties. Periodic law is the arrangement of the elements in order of increasing atomic number.
What’s the name of this compound?
Answers
which of the following represents a beta particle?
Answers
Answer:
[tex]{ \sf{A. \: \: { _{ - 1}{}^{0} e }}}[/tex]
A beta particle is an electron.
Explanation:
[tex]{ \tt{ {}^{4}_{2}He \: \: is \: an \: alpha \: particle.}} \\ { \tt{ \gamma \: \: is \: gamma \: rays}} \\ { \tt{ \alpha \: is \: same \: as \: alpha \: particle}}[/tex]
The beta particles are the high energy electron radiations, with the representation as as [tex]\rm ^0_{-1}e[/tex].
What are nuclear reaction radiations?The nuclear radiations result in the release of the mass in the form of varying types of particles. The particles ejected in nuclear reaction are alpha, beta, or gamma particles.
Beta particles are high energy particles with the presence of negative charge with the loss of electron.
The beta particle can be represented as [tex]\rm ^0_{-1}e[/tex]. Thus, option A is correct.
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