Answer:periodic table
Explanation:
What’s the phase change to solid to gas
How do atoms emit light ?
Answer:
The frequencies of light that an atom can emit are dependent on states the electrons can be in. When excited, an electron moves to a higher energy level or orbital. When the electron falls back to its ground level the light is emitted.
Which amino acid is least likely to produce a hydrogen bond with water or polar molecules?
What's the largest planet on Earth?
Answer:
Asia
Explanation:
Answer:
Asia.
Explanation:
what provides the energy needed to fuel the water cycle
Answer:
Sunlight provides the energy
The sum of the number of protons and neutrons in an atom is called the ________ of the element. 1. Molar Mass 2. Atomic number 3. Average atomic mass 4. Mass number
o2 o4 o3 o1
Answer:
The sum of the number of protons and neutrons in an atom is called the Mass number.
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Cloud is a gas.
ice is a solid.
snow is a solid.
steam is a gas.
rain is a liquid.
A) remove 1.5ml of liquid
B) add 1.5 ml of liquid
C) remove 0.5 ml of liquid
D) add 0.5 mo of liquid
The ground-state electron configuration for an element contains an unpaired 3s electron.
Answer:
Na
Sodium is located in the third row of the periodic table, where the 3s3s3, s orbital is being filled. Because sodium is the first of the two 3s3s3, s elements, its ground-state electron configuration contains a single, unpaired 3s3s3, s electron.
Explanation:
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The ground-state electron configuration for an element contains an unpaired 3s electron is Sodium, Na.
The ground state electron configuration of an element shows a series of how its electrons are arranged in thier orbitals at their lowest energy state.
The element which contained an unpaired 3s electron is the Alkali metal, Sodium.
Sodium, Na has atomic number of 11 and at ground state and will therefore be written as 1s²2s²2p⁶3s¹ We can also write the condensed form since the core electrons is the same with Ne, a noble gas which is [Ne]3s1.
The s orbital should contain at most 2 electrons , since for sodium, it has 1 electron in the 3s orbital, we say it is unpaired.
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What is the percentage by mass of a solution with 30.0g salt dissolved in water to make 650.0g 0f solution?
Please help
Answer:
The percentage by mass of a solution with 30.0g salt dissolved in water to make 650.0g 0f solution is 4.61 %
Explanation:
The mass percentage of a solution is a measure of concentration that indicates the number of grams of solute that there are per 100 grams of solution.
The percent by mass is calculated as the mass of a component divided by the total mass of the mixture, multiplied by 100 to give a percentage.
[tex]percentage by mass=\frac{solute mass}{solution mass} *100[/tex]
In this case:
solute mass: 30 gsolution mass: 650 gReplacing in the definition of percent by mass:
[tex]percentage by mass=\frac{30 g}{650 g} *100[/tex]
Solving:
percent by mass= 4.61 %
The percentage by mass of a solution with 30.0g salt dissolved in water to make 650.0g 0f solution is 4.61 %
How many kinds of atoms are there
Answer:
there are more than 109 different types of atom - one for each element.
What neutral element has the electron configuration described by the Aufbau diagram above.
Answer:
Aluminium.
Explanation:
The above electronic configuration can be written in a simplified form as shown below:
1s² 2s²2p⁶ 3s²3p¹
Next, we shall determine the number of electrons in the atom of the element as follow:
Number electron = 2 + 2 + 6 + 2 + 1
Number of electron = 13
Next, we shall determine the number of protons.
Since the element is in its neutral state,
The number of electrons and protons are equal i.e
Proton = Electron
Number of electron = 13
Proton = Electron = 13
Proton = 13
Next, we shall determine the atomic number of the element.
The atomic number of an element is simply the number of protons in the atom of the element i.e
Atomic number = proton number
Proton = 13
Atomic number = 13
Comparing the atomic number of the element with those in the periodic table, the element with the above electronic configuration is aluminium since no two elements have the same atomic number.
Question 26 (1 point)
Use the periodic table to determine which statement below is true of the element Bromine (Br).
•Bromine will lose 7 valence electrons to become a negative ion.
•Bromine will lose 7 valence electrons to become a positive ion.
•Bromine will gain 1 valence electron to become a negative ion.
•Bromine will gain 1 valence electron to become a positive ion.
Answer:
The correct option is;
Bromine will gain 1 valence electron to become a negative ion
Explanation:
Bromine can be found in period 4 in group 17 of the periodic table and is an halogen
The electron configuration of bromine can be presented as follows;
Electronic configuration 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁵
Therefore, an atom of bromine has 2 + 5 or 7 electrons in its outermost shell, which makes it have one less electron to complete a full octet structure and therefore, bromine has a strong affinity for electron to complete its octet structure and it is thus a strong oxidizing agent.
When bromine enters into a chemical reaction and gains the one valence electron it becomes a negatively charged ion.
What example of scientific thinking does Bohr response best indicate
Answer:
The Bohr model shows the atom as a central nucleus containing protons and neutrons with the electrons in circular orbitals at specific distances from the nucleus (Figure 1). These orbits form electron shells or energy levels, which are a way of visualizing the number of electrons in the various shells
How does peer review affect research?
Experimental results will be trusted by the scientific community only if they have been peer-reviewed. Thus, option A is correct.
What is research?Research is the creation of new knowledge and/or the use of existing knowledge in a new and creative way so as to generate new concepts and understandings.
“Peer-reviewed” means that the paper is analyzed by fellow scientists, who evaluate the logic or methodology that might shed doubt on the findings.
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Consider the electron configuration. A box holds an up and a down arrow. A box holds an up and a down arrow. A box holds an up and a down arrow.A box holds an up and a down arrow.A box holds an up and a down arrow. A box holds an up and a down arrow. A box holds an up and a down arrow.A box holds an up and a down arrow.A box holds an up arrow. 1s 2s 2p 3s 3p Which element has this electron configuration? astatine bromine chlorine fluorine
Answer:
Chlorine
Explanation:
Each arrow represents one electron. Most of the boxes are filled, meaning they have two electrons. The last box only has one arrow, so it only has one electron. If you add it up, you get 17, which is Chlorine.
Find the force if the mass is 6 kg and the acceleration is 12 m/s/s?
Answer:
72 Newton
Explanation:
force=mass x acceleration due to gravity
Force applied on object is 72 Newton
Given that;
mass of thing = 6 kg
Acceleration = 12 m/s²
Find:
Force applied on object
Computation:
Force = mass × acceleration
Force applied on object = 6 × 12
Force applied on object = 72 Newton
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If a gas has a mass of 468 grams and its density is 17 grams per liter, how much volume does it occupy?
Answer:
The answer is
27.53 LitresExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{Density} [/tex]
From the question
mass = 468 g
Density = 17 g/L
Substitute the values into the above formula and solve
We have
[tex]volume = \frac{468}{17} \\ = 27.529411[/tex]
We have the final answer as
27.53 LHope this helps you
True or false: Only liquids can be described as fluids. I NEEED HELPP NOWWW
Answer:
Explanation:
no, as it can also be used to describe a gas- a fluid includes liquids, gases and plasms
Calculate the mass of water if the densityis 1.02 g/mL and the volume is 62 ml. M = (D(V)
.016 mL
60.78 mL
63.24 mL
73.24 mL
Answer:
The answer is
63.24 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 62 mL
density = 1.02 g/mL
The mass is
mass = 1.02 × 62
We have the final answer as
63.24 gHope this helps you
A car travels 350 km in 7 hours. What is the average speed of the car (in km/hr)?
Answer:
50 km/hr
Explanation:
just divide the distance by the time (350/7)
Answer:
50 km/hr
Explanation:
Distance = 350 km
Time = 7 hours
Average Speed = ?
[tex]Average\:Speed = \frac{Distance}{Time} \\\\Average\: speed = \frac{350\:km}{7\:hr} \\\\A.V = 50\:km/hr[/tex]
A wave has a length of 8 meters and a speed of 32 meters per second. What is the frequency of the wave?
Answer:
f=vλ where: f is the frequency of the wave in hertz. v is the velocity of the wave in meters per second. λ is the wavelength of the wave in meters
f= 32*8 = 256 hertz
Explanation:
ANSWER PLEASE!!
Which one of the following explains why the atom in the diagram
is highly reactive?
option c is correct
number of electron in the outermost shell describe the reactivity if the outermost shell is completely filled its mean the reactivity of element is low and if it is completely filled then the element is highly reactive
Which statement best describes how the use of gasoline in a car relates to the discipline of chemistry?
The materials used come from the ground,
The gasoline undergoes a change as it burns
A car uses the gasoline to move
All parts of the car are composed of chemicals.
Answer:
The gasoline undergoes a change as it burns.
Explanation:
Just took the Unit Test review ((:
Answer:
b
Explanation:
because i said so brudda
The compound M-O-H can act both as acid or base depending upon the ionisation
enthalpy of the element M. Justify by taking elements (M) of the third period of the
periodic table.
action
Answer:
Explanation:
A compound that can act both as an acid and a base is called an amphoteric substance. A good example (based on the question) of an amphoteric substance is the Aluminium hydroxide [Al(OH)₃] where Aluminium is the "M" in M-O-H. Aluminium is in the third period of the periodic table. The reaction below shows aluminium can act both as an acid and as a base in different neutralization reactions.
As an acid
Al(OH)₃ + 3NaOH ⇒ Na₃AlO₃ + 3H₂O
As a base
3HCl + Al(OH)₃ ⇒ AlCl₃ + 3H₂O
NOTE: A neutralization reaction is a reaction between an acid and a base to give you salt and water
Which form of heat transfer is the sun heating Earth's atmosphere? *
Answer:
Radiation
Explanation:
Radiation is the transfer of heat energy through space by electromagnetic radiation. Most of the electromagnetic radiation that comes to the earth from the sun is invisible.
Shreya spent $16 on a magazine and some
erasers. If the magazine cost $7 and each
eraser cost $3, then how many erasers did
she buy?
Answer:
she bought 3 erasers an got two dollars back
Explanation:
which compound forms 2 parts of hydrogen and 1 part of oxygen?
Answer:
water
for one molecule of water each atom has the atomic mass unit, u,shown.
Explanation:
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What does the atomic mass come from on the periodic table?
The atomic mass comes from isotopes on the periodic table.
When a scientist analyzes experimental results, the scientist is generally: