Answer:
unit formula??
Explanation:
Which group/family contains elements with the smallest radius within the same period?
Answer:
Halogens
Explanation:
From the given choices, the halogens will have the smallest radius within the same period.
The size of an atom is estimated by the atomic radius. This is taken as half of the inter-nuclear distance between two covalently bonded atoms of non-metallic elements or half of the distance between two nuclei in the solid state.
Across a period in the periodic table, atomic radii decrease progressively from left to right. Down a group from top to bottom, atomic radii increase progressively due to the addition of successive shells.Since halogen is the right most group from the choices given, it will have the smallest radius.
As temperature changes, rocks expand and
contract. The rocks eventually break into
smaller pieces. Which process accounts for
this expansion and contraction of rocks?
Answer:
Thermal heating and cooling
Explanation:
This process described results from thermal heating and cooling as a mechanism of mechanical weathering of rock bodies.
It is often more pronounced in the arid regions of the world where there is a significant difference between day and night temperatures. With mechanical weathering, rocks are broken down into fragments by physical disintegration. During the day, the high temperature causes the rock to expand significantly. At night, the rock contracts and on the long run, joints and fractures begins to appear on the rock surface. PLEASE HELP YOU HAVE TO CLICK THE CORRECT ONES PLEASE IM BEGGING YALL IF I FAIL THIS I FAIL MY GRADE....... Directions: Select each correct image. More than one image may be correct.
The diagrams below show interactions between charged particles. The blue particles are negatively charged, and the red particles
are positively charged.
Which of the diagrams shows a correct interaction between the fields of two charged particles?
Answer:
D
Explanation:
Since the negative particles are going towards the negative section and the positive particles are leaving the positive section. Additionally, opposite charges attract each other and like charges repel each other.
There will be attraction between the opposite charges and repulsion among the like charges. Here the diagram D shows a correct interaction between the fields of two charged particles.
What is a electric field?The electric force acting per unit charge is defined as the electric field. They are generally produced by changing the electric charges or magnetic fields. The electric field strength is expressed in volt per meter (V/m).
E = F/Q
In an electric field it is the electric charge which provides the direction of field. If the charge is negative, then the field is directed towards the charge. A field is directed away from the charge if the charge is negative.
All the electric fields start form a positive charge and end on a negative charge. If two positive charges interact then there will be repulsion between them. But if a positive charge interact with a negative charge then there will be attraction among them.
In diagram D there is an attraction between the opposite charges.
Thus the correct option is D.
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What pressure will be exerted by 25 g of CO2 at temperature of 25°C and a volume of .50 L?
Please, i dont know what the brainliest thing is but ill give it.
Answer:
P = 27.9 atm
Explanation:
Given data:
Mass of CO₂ = 25 g
Temperature = 25°C (25+273.15 K = 298.15 K)
Volume of gas = 0.50 L
Pressure of gas = ?
Solution:
Firs of all we will calculate the number of moles of gas,
Number of moles = mass/molar mass
Number of moles = 25 g/ 44 g/mol
Number of moles = 0.57 mol
Pressure of gas :
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
P × 0.50 L = 0.57 mol × 0.0821 atm.L/ mol.K × 298.15 K
P = 13.95 atm.L/ 0.50 L
P = 27.9 atm
In Figure 2.4, what is the total number of electrons that can occupy the n=
3 level? *
3
6
9
18
Answer:
18
Explanation:
The n - level given is 3
To find the number electrons that can occupy this level, we use:
2n²
n - is the energy level.
The energy level here is 3;
2 x 3² = 18
What do we call a cloud that forms right on the surface of the Earth? *
Answer:
that's ur answer cumulus clouds I hope it helps
Explain which has a greater impact on the kinetic energy of an object - the
object's mass or the object's speed?
Answer:
it is the objects mass, I learned this last semester
The object's mass has a greater impact on the kinetic energy of an object as it is the mass the mass on which force is exerted and in which energy is stored to be transformed in to kinetic energy.
What is force?Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.
It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.
The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.
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How are science and technology related
There is no answer, science is about empirical knowledge, technology is the sum of techniques, skills, methods, and processes. I do not believe that you will find a answer for that.
Describe each layer of Earth’s current atmosphere below:
Answer:
exosphere thermosphere mesosphere stratosphere troposphere
What kind of boundary is this boundary is the site of recurring earthquake activity and faulting.
Answer:
Transform boundary
Explanation:
The boundary that is a site of recurring earthquake and faulting activities is the transform boundary.
At a transform boundary, there is a significantly high prevalence of earthquakes and faulting.
In this margin, plates slides past one another laterally along a strike - slip direction. This brings about significant shearing and crushing of rocks. It leads to series of earthquakes and faults One notable example is the San Andreas faultWhat is the destiny of an object that has a mass of 20 grams and a volume of 10 millimeters
Answer:
2gcm⁻³
Explanation:
Given parameters:
Mass of the object = 20g
Volume = 10mL
Unknown:
Density of the object = ?
Solution:
Density of a body is its mass per unit volume;
Density = [tex]\frac{mass}{volume}[/tex]
We need to convert mL to cm³ for the volume
1mL = 1cm³;
10mL is therefore, 10cm³
So;
Density = [tex]\frac{20}{10}[/tex] = 2gcm⁻³
How do you determine if a polyatomic ion needs to be counted together?
Answer:
Calculate from Oxidation Number
The oxidation number of oxygen is -2, and the oxidation number of hydrogen is +1. Add together the oxidation numbers of all the atoms in the polyatomic ion. In the example, -2 +1 = -1. This is the charge on the polyatomic ion.
How many pairs of electrons are shared in a double bond?
A. 1
B. 2.
C. 3
D. 4
Answer:
B. 2
Explanation:
A double covalent bond is where two pairs of electrons are shared between the atoms rather than just one pair
B
A Double bond is when two atoms share two pairs of electrons with each other. It is depicted by two horizontal lines between two atoms in a molecule
A mixture of tea,
lemon juice, and
sugar is an example
of what?
Answer:
Explanation:
That in the liquid, the sugar is completely dissolved. Lemon juice, water, and sugar are combined together and form a solution. A solution is a mixture in which the various types of matter are evenly spread out. Water is considered the solvent of lemonade.
What are some properties of an ice cube that tell you it is a solid? Write at least one property, and explain
how it relates to an ice cube.
Answer:
Well ice cubes are normally liquids but it is frozen water making it a solid. Since they are made of water particles, they wouldn't normally be a solid, but the particles are packed close enough together to make it one. Hope this helps! :D
Explanation:
8. An element that has strong intermolecular forces is most likely to have:
•a boiling point below room temperature
•a melting point below room temperature
•a boiling point very close to its melting point
•a very high melting point
Answer:
a very high melting point answer
A gold chain has a volume of 4cm3. The density of gold is 19.3 g/cm3. Calculate the mass of the gold chain. Which one is it ?
-4.8 grams
-23.3 grams
-0.21 grams
-77.2 grams
what is the mass of an atom that has 8 protons 8 electrons and 10 neutrons
Answer:
15.999 it would turn into 16 then.
Explanation:
If the element has 8 protons that means the atomic number is 8 which is on the periodic table, which shows oxygen has the atomic number of 8. Oxygen has an atomic mass of 15.999 which rounds up to 16, hope this helps.
Look at mah doggo his name is jasper I have another dog but I cant post two pictures
Answer:
☺
Explanation:
Awwww it's so cute
PLEASE ANSWER ASAP ITS TIMED
2Al + Fe ----> Al2O3 +2Fe
For the reaction above, the mole ratio Aluminium to Aluminuim Oxide is
a.1:1
b.2:1
c.1:2
d.2:2
The mole ratio Aluminium to Aluminum Oxide is 2 : 1
Further explanationGiven
Reaction
2Al + Fe ----> Al2O3 +2Fe
Required
The mol ratio
Solution
If we look at the reaction above, there is an element missing from the reactant i.e oxygen, because the number of atoms and elements involved in the reaction should be the same between the reactants and products.
So the possible and balanced reactions are:
2Al(s) + Fe₂O₃ (s) → Al₂O₃ (s)+ 2Fe (s)
From this reaction the ratio of Al: Al₂O₃ can be determined, which is 2: 1
A scientist wants to determine how many gallons of milk the children at her son's elementary school drink per week. She sends out a survey (with approval by the school) and
takes data on how many gallons of milk each student says they drink. What are the independent and dependent variables?
If the boiling point of HCl is -85 (C) and the boiling point of Hl is -36 (C),
what would be a good estimate for the boiling point of HBr? *
help plzzzzzzzzzzzzzzz
Answer:
Blue is the metal Metals react by losing electrons from the outermost shell, which means their outermost electrons and now closer to the nucleus (one shell lower) and thus they get smaller when you go from metal atom to metal ion.
Explanation:
What happens when two magnets rappel each other hehe
Answer:
Every magnet has two sides: a north pole and a south pole. We use these names because if you hang a magnet from a thread, the magnet’s north pole points (almost) towards the north direction.
This is because the Earth’s core (its centre) is a large, weak magnet. Your little, strong magnet lines up with Earth’s magnetic core, so it points north. That’s how a magnetic compass works.
Help Determine the number of lead (Pb) atoms that could fit into a 3.0 L container if the density of lead is 11.34 g/cm3
Show work pls
Explanation: You know that the mass of an individual lead atom is equal to
3.4
⋅
10
−
22
grams.
A substance's density tells you what its mass per unit of volume is. In this case, you know that lead has a density of
11.3 g/cm
3
, which means that each
cm
3
of lead will have a mass of
11.3 g
.
Now, your cube has a volume of
2.00 cm
3
, which means that its mass will be equal to
2.00
cm
3
⋅
density
11.3 g
1
cm
3
=
22.6 g
Now all you have to do is look at the mass of one lead atom and figure out exactly how many lead atoms would be needed to make the total mass of the cube equal to
22.6 g
.
22.6
g
⋅
the mass per atom
1 lead atom
3.4
⋅
10
−
22
g
=
6.647
⋅
10
22
lead atoms
Rounded to two sig figs, the number of sig figs you have for the mass of an individual lead atom, the answer will be
no. of lead atoms
=
6.6
⋅
10
22
atoms
You can double-check this result by using lead's molar mass, which tells you what the exact mass of one mole of lead is.
22.6
g
⋅
1 mole Pb
207.2
g
=
0.1091 moles Pb
Now use Avogadro's number to determine how many atoms of lead you have in that many moles
0.1091
moles
⋅
6.022
⋅
10
23
atoms
1
mole
=
6.57
⋅
10
22
atoms
To two sig figs, you will once again get
no. of lead atoms
=
Which characteristics describe most nonmetals in the solid phase?
1
They are malleable and have metallic luster.
2
They are malleable and lack metallic luster.
3
They are brittle and have metallic luster.
4
They are brittle and lack metallic luster.
Answer:
4
Explanation:
its a non-metal, dont get confused and pick number 1- it may seem like that’s the answer but remember here we are talking abut the solid phase!
Periodic table is divided into three metals, non metals and metalloids. The non metals are kept on the right side of the periodic table. Th correct option is option D.
What are non metals?Non metals are the element that have property to gain electron. When any element gain electron then element attain negative charge and that element is called anion. The examples of non metals are Oxygen, nitrogen, carbon, Fluorine etc.
The properties of non metals are
Non metals are soft.
Non metals are not malleable that is they can be broken into thin sheets.
Non metals are not ductile they can not be broken into thin wires.
Non metals are brittle in nature that is they can be broken down easily.
Non metals are not lustrous.
Therefore the correct option is option D.
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How many Molecules are in 20 grams of CO?
Answer:
2.74 x 1023 molecules of CO2.
Explanation:
There are 2.74 x 1023 molecules of CO2.
a base is defined as a compound that produces
What is the wavelength of an electromagnetic wave that travels at 3 x 10^8 m/s and has a frequency of 60 mhz? (1 mhz = 1,000,000 hz)?
Answer:
5m
Explanation:
Given parameters:
Speed of wave = 3 x 10⁸m/s
Frequency = 60mhz = 60 x 10⁶Hz
Unknown:
wavelength = ?
Solution:
To solve this problem;
we use the expression:
V = F ∧
V is the velocity
F is the frequency
∧ is the wavelength
Now insert the parameters and solve;
3 x 10⁸ = 60 x 10⁶ x ∧
So;
∧ = 5m
Which of the following gases was NOT part of Earth’s original atmosphere?
Answer:anser choices
Explanation:
Answer:oxygen hahah
Explanation: