Answer:
Mark me brainliest
Explanation:
Standards help avoid confusion and ambiguity when taking measurements. For example, a meter will always be the same length, no matter who is taking the measurement or where it is being taken.
The Periodic Table is a chart of elements arranged in rows and columns according to their what
physical properties.
chemical properties.
name.
place of origin.
Use the information below to explain why the atomic radius decreases down a group.
Answer:
Detail is given below
Explanation:
Atomic radii trend along group:
As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
As the size of atom increases the ionization energy from top to bottom also decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.
In A we can see that there is one positive charge and force of attraction is 2.30×10⁻⁸ N and distance is 0.10 nm
In B we can see that negative charge is further away from nucleus because of greater distance thus force of attraction will be less. 0.58×10⁻⁸ N
In C this distance further increases and force also goes in decreasing 0.26×10⁻⁸ N.
a large office building is 1.07x10^2m long,31m wide. and 4.25x10^2m high. what id the volume?
If a large office building is 1.07 x 10^2 meters long, 31 meters wide. and 4.25 x 10^2 meters high, then the volume of the building would be 1409725 meters cube.
What is density?It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.
As given in the problem we have to calculate the volume of a large office building having the dimensions of 1.07 x 10 ^2 meters long, 31 meters wide, and 4.25 x 10^2 meters high.
The volume of the office building = length × width × height
=107 × 31 × 425
=140925 meters cube
Thus, the volume of the building would be 140925 meters cube.
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What is the density of a metal with a mass of 20 g and a volume of 4 cm^3
Answer:
5 g/cm^3
Explanation:
density = mass/volume
20/4 = 5
1.As with any grid, the periodic table has ________ (left to right) and __________ (up and down).
2.Every row is called a ___________.
3.All the elements in the same period have the same number of _______.
Each column is called a __________.
4.The elements in each group have the _________ number of electrons in the outer orbital (or valence electrons).
5.Noble gases and helium are considered “happy” because their ______________ shell is ___________.
this was not a multiple-choice its about the periodic table
Answer:
rows and columnsperiodatomic orbitalsvalence electrons4.similar properties
5.electrons are very reactive
the outermostWhich pair is classified as pure substances? a. compounds and solutionsc. elements and mixtures b. mixtures and solutionsd. compounds and elements
Answer:
d. compounds and elements
Explanation:
a pure substance is when something is made up of one type of thing, whether it be elements, where they are made up of one type of atom or a compound, where its atoms are chemically bonded and cannot be broken down by physical means
5. (4 points) “She’s singing higher than he is” is a statement related to:___
A. Volume
B. Pitch
Answer:
It's pitch
Explanation:
I play violin and it would be the same. Pitch is how high a note is. A B in treble clef is higher than a G
why sodium is active element...
Answer:
here is your answer
Explanation:
1. sodium sodium is very reactive metal
2. when it exposed in air it automatically form Na2O.
3. when when it put in water it reacts visoroustly and start burning on water.
( due to this it is called active element)
A 57.9 gram mass has a volume of 3 cm 3. What is the density of the mass?
Answer:
The answer is 19.3 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume}\\[/tex]
From the question
mass = 57.9 g
volume = 3 cm³
We have
[tex]density = \frac{57.9}{3} \\ [/tex]
We have the final answer as
19.3 g/cm³Hope this helps you
Please pray for healing and my name is Fairouz
Answer:
I hope everything gets better
Explanation:
Answer:
I hope you are better now
what's the answer plz help
Answer:
C.. one enegry level..
Help please! Plates of the lithosphere float on top of the gooey part of the mantle called the:
A. atmosphere
B. crust
C. asthenosphere
D. core
Answer:
C. Asthenosphere
Explanation:
You need to determine the
volume piece of chalk using water
displacement. The graduated cylinder
filled with water measures 8.7 mL
before the chalk is added. After the
chalk is added the water level rises
and now reads 12.4 mL. Determine the
volume of the piece of chalk in mL.
Answer:
3.7 mL
Explanation:
Step 1: Given data
Volume of water before the chalk is added: 8.7 mL
Volume of water after the chalk is added: 12.4 mL
Volume of the chalk: ?
Step 2: Calculate the volume of the chalk
The volume of the chalk is equal to the volume of water after the chalk is added minus the volume of water before the chalk is added.
V = 12.4 mL - 8.7 mL = 3.7 mL
2 Which thing has the most mass?
O marble
elephant
O fork
Obaseball
Explanation:
marble is the correct answer
Answer:
Elephant
Explanation:
An elaphant is the option with the most mass.
Hope this helps! Please makr brainliest! Stay safe, God bless and happy studying!
How many significant figures are in 0.00030
The mass spectrum of the element Sb is most likely represented by which of the following?
A. 122 Atomic Mass
B. 121 and 123 Atomic Mass
C. 120, 123 and 124 Atomic Mass
D. 120,121 and 124 Atomic Mass
The correct answer is B: 121 and 123 Atomic Mass.
Mass spectrometers only detect stable isotopes.
Almost all elements exhibit isotopy. Isotopy is a phenomenon whereby atoms of the same atomic number have different atomic masses. The relative atomic mass of each element is the weighted average of the masses of all its isotopes.
Owing to the phenomenon of isotopy, the relative atomic mass of elements are not whole numbers.
The isotopes recorded by a mass spectrometer are stable isotopes of an element. The two stable isotopes of antimony are Sb-121 and Sb-123. These two appear in its mass spectrum.
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Please help me!! Look at the picture to understand the question please!
Which of these red outlined elements is most similar to Chlorine (CL)?
A. He
B. I
C. AI
Answer:
C. I
Explanation:
The elements are categorized in groups and periods. The periods are horizontal and the groups are vertical. The elements in the same group (vertical) have very similar characteristics.
How many electrons does chlorine need to obtain a full outer energy level of electrons? A) 1 B) 2 C) 3 D) 4
You just need one to reach full energy. (A)
Only one electrons does chlorine need to obtain a full outer energy level of electrons. Thus, option A is correct.
What is an electron?An electron is defined as a subatomic particle which is charged negatively either bounded to an atom or not it means free. The nucleus of an atom is made up of electron, proton and neutron. The electron is a basic particle and electron is not made of anything.
The nature of electron is free it means they are present freely in nature and consist of an atom.The main function of electron is that they play the role of negatively- charged component of an atom.
The electrons are primary source of current conducting and electrons number as well as atomic number of an element is always same or equal. There is no size of electron but the mass of electron is 9×10^-31.
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what is dimensional analysis?
Answer:
the analysis of the relationships between different physical quantities by identifying their base quantities and units of measure and tracking these dimensions as calculations or comparisons are performed.
Explanation:
George has several plants in his garden once in a while he adds fertilizer to the soil then leaves absorb the nutrients in the fertilizer and you look healthy if a cell is compared to a plant which organelle helps transport fertilizer from the soil to leaf?
A. lysosome
B. mitochondrion
C. vacuole
D. vesicle
What is the molecular geometry of PBr3? A. trigonal pyramidal B. trigonal planar C. linear D....
The geometry of PBr₃ is trigonal pyramidal. Therefore, option A is correct.
Trigonal pyramidal geometry refers to the molecular geometry around a central atom in a molecule or ion where there are three bonded atoms and one lone pair of electrons. This geometry is commonly found in molecules with a central atom surrounded by three bonding pairs and one non-bonding pair of electrons.
The term "trigonal" refers to the arrangement of the three bonding pairs, which are positioned in a flat, triangular shape around the central atom. The term "pyramidal" indicates that the lone pair of electrons occupies the fourth position, giving the molecule a three-dimensional pyramid-like shape.
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What is the step that usually comes last in solving numeric problems
What is the main type of energy present in a cordless power saw?
Answer:
chemical energy
Explanation:
cordless power saw has rechargeable battery attached to it.
and we know storage energy in battery is chemical hence cordless power saw has chemical energy present in it.
When the saw is operated, the chemical energy is converted into electrical energy which causes the motor fitted in power saw to move.
Thus,
in cordless power saw
chemical energy is converted into electrical energy
electrical energy is converted into mechanical energy.
Would the following configuration represent
ground or excited state: 15²2s22p03823p®4s'3d"
Excited
Ground
Answer:
Excited state
Explanation:
n a chemical reaction the ______of reactants and products are always equal.
Answer:
mass
Explanation:
As given by the law of conservation of mass. Hopes this helps!
An object starts from rest and exhibits the motion represented by the graph. The object’s average velocity during the 3 second to 5 second time interval is approximately –
8.4 m/s
3.2 m/s
4.8 m/s
.0125 m/s
Answer:
8.4 m/s
Explanation:
Initial velocity of the object is 0 as it was at rest.
We need to find the object’s average velocity during the 3 second to 5 second.
We can see from the graph that from 3 s to 5 s, the graph is a straight line. If we take the slope we can find the average velocity during the 3 second to 5 second.
Displacement between 3 s to 5 s is :
D = 24.8 m - 8 m = 16.8 m
Time = 5 s - 3 s = 2 s
Now,
Average velocity,
[tex]v=\dfrac{\Delta y}{\Delta x}\\\\y=\dfrac{16.8\ m}{2\ m}\\\\y=8.4\ m[/tex]
So, the object’s average velocity during the 3 second to 5 second is 8.4 m/s.
electronegativity of argon element
Answer:
argon is 18 2-8-8 since it has octet circle and fully stable you can say it has no electro negativity
Which row in the chart below best
describes asexual reproduction?
3
2
1
4
Answer:
1
Explanation:
Asexual reproduction is the ability of an organism to produce offspring identical to themselves.
In asexual reproduction, the number of parents is one, and the generation of offspring is genetically identical to a single parent. Therefore, row (1) best describes asexual reproduction.
What is asexual reproduction?Asexual reproduction can be described as a mode of reproduction in which a new offspring is generated by a single parent. The new individuals generated are genetically and physically identical to each of their parents. Asexual reproduction can be defined as the mode of reproduction in which the production takes place of offspring by a single parent.
Asexual reproduction can be observed in both multicellular and unicellular organisms. This process does not include gamete fusion and no change in the number of chromosomes either. Asexual reproduction will inherit the same genes as the parent.
Characteristics of Asexual Reproduction are single parent, no fertilization takes place, occurs in a very short time, and grows rapidly. The offspring in asexual reproduction is genetically similar.
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Is a single piece of evidence enough to show that a hypothesis is not supported?
Answer:
no
Explanation:
What happened to the rate of the reaction when the concentration was increased?
Explain the effect of concentration on reaction rate in terms of collision theory. Your answer should include at least four complete sentences.
Answer:
If you increase the concentration of a reactant, there will be more of the chemical present. More reactant particles moving together allow more collisions to happen and so the reaction rate is increased. The higher the concentration of reactants, the faster the rate of a reaction will be.
