Answer:
Summary. To summarize, the periodic table is important because it is organized to provide a great deal of information about elements and how they relate to one another in one easy-to-use reference. The table can be used to predict the properties of elements, even those that have not yet been discovered.
If a car has a force of 490 N forward and encounters a backwards force of
180 N, what will the net force be?
Describe the structure and properties of an atom.
Name 10 elements and their chemical symbols.
Describe the three types of bonds.
Describe the pH scale and differences between acids and bases.
Describe the different states of matter on Earth.
Explain the law of conservation of matter and the law of conservation of energy.
1. Structure of an atom:-
The basic structure of an atom includes a tiny, relatively massive nucleus, containing at least one proton and usually one or more neutrons.Outside of the nucleus are energy levels (also called shells), which contain one or more electrons.
Properties of an atom:-
The neutrons have the greatest mass and have no charge. The protons have slightly less mass than the neutrons and are positively charged. The electrons have almost no mass and are negatively charged. The chemical properties of the atom are determined by the number of protons, in fact, by number and arrangement of electrons.
2. Elements and their chemical symbols :-
1) Sodium - Na
2) Carbon - C
3) Magnesium - Mg
4) Aluminium - Al
5) Silicon - Si
6) Chlorine - Cl
7) Potassium - K
8) Calcium - Ca
9) Copper - Cu
10) Iron - Fe
3. ionic bond
Covalent bond
Metallic bond
4. pH scale used to specify the acidity or basicity of an aqueous solution. Acidic solutions are measured to have lower pH values than basic or alkaline solutions
5. There are four natural states of matter: Solids, liquids, gases and plasma.
6. Law of conservation of mass :
The 'law of conservation of mass' says that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. The mass of the products in a chemical reaction must equal the mass of the reactants.
Law of conservation of energy :-
According to the law of conservation of energy, energy can only be transformed from one form to another. It can neither be created nor destroyed. The total energy before and after the transformation always remains constant.
Make a suggestion on how you will deal with the problem..
Answer:
and the last name then select a City the solution if they are getting elimination method if I can tell u that is telling you about me to this email and delete this email and any attachments may contain confidential information and rupees hundred years ago the pair in the solution if I can tell you my story of my teacher not respond please ask me to this email and any attachments is intended only for the independence of Bangladesh and what is the correct answer is yes we have to come at your earliest convenience and what is the correct answer
Answer:
If you are asking to suggest a method to preserve the extinction of this species of pigeon then
1. Governments should derive a law that will prevent hunting of these pigeons.
2. These pigeons should be given a place in sanctuaries with hospitable habitat made available.
3. If someone sees a bird of this kind care should be taken not to harm it intentionally or accidentally.
4. Breeding this type of Birds should be Promoted to increase their number
help me please, i have 20 auestions
Answer:
B
Explanation:
PE=m*delta(h)*g
So 0.75*1.5*9.8 equals PE
=11.025 so round up
right
a force of 20 newtons (N).
Mass 10 kg
Force
20 N
22. Using the equation below, calculate the acceleration of
the cart in meters per second squared (m/s 2)
Force = Mass X Acceleration
m/s 2
Which element has the most metallic characteristics?
O Selenium (Se)
Arsenic (As)
O Germanium (Ge)
O Gallium (Ga)
Answer:
(Ge)
Explanation:
I'm just taking a wild guess really!
Question 5 of 10
SO3 is an empirical formula for which of the following?
A. S04
B. S203
C. S402
D. S206
a boy and a girl are pulling a heavy crate at the same time with 7 units of force each what is the net force on the object is the object balanced or unbalanced
Answer:
Net force= 0N or 0units
Object is balanced
Explanation:
Net force refers to all the sum total of all forces acting upon an object. In this case, a boy and a girl are pulling a heavy crate at the same time with 7 units of force each.
- This means that the force exerted on the crate by the boy is F1 = 7units
- The force exerted on the crate by the girl is F2 = -7units
Hence, the Fnet = F1 + F2
Fnet = 7 + (-7)
Fnet = 0 units
An object which possess a net force is said to be unbalanced, while an object with no net force i.e 0 units or N. Hence, the heavy crate in this case being pulled by a net force of 0units is BALANCED.
The force applied on the object is a balanced force since the object is at equilibrium.
The given parameters;
force applied by the boy, F₁ = 7 N
force applied by the girl, F₂ = 7 N
The net force on the object is the resultant of the two equal both opposite directed force.
Let the boy's direction be positive
Let the girl's direction be negative
The resultant of the two forces is calculated as;
[tex]\Sigma F_x = F_1 + F_2\\\\\Sigma F_x = (7 \ N) + (-7 \ N)\\\\\Sigma F_x = 0[/tex]
Thus, the force applied on the object is a balanced force since the object is at equilibrium.
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3. The manipulation of living organisms to produce desired products or results is known as...
a. Sustainability
b. Biotic Factor
c. Biotechnology
d. Abiotic Factor
Answer:
C. Biotechnology
Explanation:
In its broadest definition, biotechnology is the application of biological techniques and engineered organisms to make products or modify plants and animals to carry desired traits. This definition also extends to the use of various human cells and other body parts to produce desirable products.
relate the concepts of isotope and mass number
Answer:
Explanation:
Forms of the same atom that differ only in their number of neutrons are called isotopes. Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons. ... A property closely related to an atom's mass number is its atomic mass.
Which describes any compound that has at least one element from group 17?
How many moles are present in 4.50 L of fluorine gas (F2) at Standard Temperature and
Pressure?
Answer:
4.50 L gas of fluorine at STP contain 0.2 moles.
Explanation:
Given data:
Volume of gas = 4.50 L
Number of moles F₂ gas = ?
Temperature of gas = standard = 273.15 K
Pressure of gas = standard = 1 atm
Explanation:
Formula:
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will put the values in formula.
1 atm × 4.50 L = n × 0.0821 atm.L/ mol.K × 273.15 K
4.50 atm.L = n × 22.43 atm.L/ mol.
n = 4.50 atm.L / 22.43 atm.L/ mol.
n = 0.2 mol
4.50 L gas of fluorine at STP contain 0.2 moles.
3
In which of the following states of matter are the particles very far apart so they can fill their containers?
A.
gases only
ОВ.
solids, liquids, and gases
solids and liquids only
C.
D.
solids only
Answer:
A
Explanation:
With the given choices, A would be correct for this question. But, both liquids and gases have particles that are far apart so that they can fill their containers.
HELP ASPAP!!!!!!!!PLEASE PLEASE
Answer:
what do you need help with?
Explanation:
Describe a few abiotic factors found within the taiga that limit its biodiversity.
Answer:
Some abiotic factors of the taiga are temperature, precipitation, soil, and sunlight.
Explanation:
emperature affects the taiga because the winter temperature range is -65*F to 30*F (-54*C to -1*C), while the temperature range in the summer is 20*F to 70*F (-7*C to 21*C)
Precipitation affects the taiga because there's some precipitation that falls [30-85 cm. (12-33 in.)].
Soil affects the taiga because there's some acidic and low-in-nutrients soil, and some fertile soil.
Sunlight affects the taiga because there are small amounts of it that reach the ground.
The taiga biome's abiotic components include temperature, sunshine, soil, air, water, etc. Cold arctic air predominates in the taiga environment. The taiga receives more light in the summer, which causes the days to be hotter.
What are abiotic components ?Abiotic elements, also known as abiotic factors, are non-living chemical and physical elements of the environment that have an impact on the health of living things and the operation of ecosystems. Biology as a whole is supported by abiotic causes and the phenomena that go along with them.
Biotic and abiotic components, such as rainfall, in that order. The taiga is the biggest biome on Earth's surface and features a diversity of migratory and resident creatures. It also has long, cold, and dry winters and short, warm, and moist summers.
The Taiga biome is restricted by four primary criteria. Fire, temperature, the quantity of nutrients in the soil, and sunshine are the four limiting elements. Because certain plants, like the Jack Pine, recover after fire, it is a limiting element in the Taiga biome.
Thus, The taiga biome's abiotic components include temperature, sunshine, soil, air, water, etc.
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Why do you need to use a roman numeral with transition metals, but not with the alkali and alkali earth metals?
Answer:
Because they have variable oxidation states
Explanation:
Transition metals are designated with roman numerals because they have variable oxidation states.
They do not form a single ionic ion as seen by the main group elements.
Transition metals are known for their variable ions they form in ionic state. They belong to the d-block on the periodic table. They are also known to from colored solutions.I have a rock with the mass of 4.8 and a volume of 2.3.
What is the Density?
Theres no select the answer, i have to type it, and i have no clue. 18 points, brainliest if you can tell me three things along with the density of the rock: 3 more answers of density that are close to the real answer.
+Brainliest, Friend request, 18 points, thanks, and 5 star rating!
Answer:
Density = 2.08695652174
Explanation:
Density = Mass ÷ Volume
Answer if you know the answer //Which of the following is an unusual property of water?
A. Its atoms are bound by ionic bonds.
B. It doesn't exist in the gaseous state on Earth.
C. Its charge is balanced evenly around the atom.
D. It's a polar molecule.
H2O is covalent so A is false.
Water is in clouds so B is false.
Water is polar so C is false.
D is correct H2O has an imbalance of e- so it is polar. [tex]+H-O(-)-H+[/tex]
An unusual property of water is a polar molecule. Therefore, option D is correct.
What is polar molecule ?When two atoms form a covalent bond but do not share their electrons equally, polar molecules are created. A dipole is created when a portion of the molecule has a slight positive charge and a slight negative charge.
Because the electrons of the hydrogen atoms are "drawn" toward the electrons of the oxygen atom, water (H2O) is a polar molecule. As a result, the hydrogen atoms have a positive charge, whereas the opposite end of the molecule has a negative charge.
Polarity is one of the special characteristics of water because it is composed of polar molecules. Each water molecule has one oxygen atom and two hydrogen atoms (H2O). Polar covalent bonds are created by these compounds. The atoms of hydrogen are positively charged.
Thus, option D is correct.
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1) Equal masses of different substances have the same volumes.
Answer:
True
Explanation:
Which element will be more reactive - Mg (magnesium) OR Se (Selenium)? *
Answer:
magnesium
Explanation:
magnesium is in Group 2, in the periodic table. this means that it has 2 valence electrons. the less valence electrons an element or atom has, the more reactive. Selenium has 6 valence electrons. as a result, Mg is more reactive
What is the density of a sample of the alloy pewter, (a mixture of tin and copper or lead) if a 7.11 cm3 sample has a mass of 53.137g?
Answer:
The answer is 7.47 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 53.137 g
volume = 7.11 cm³
We have
[tex]density = \frac{53.137}{7.11} \\ = 7.473558368...[/tex]
We have the final answer as
7.47 g/cm³Hope this helps you
how do birds fly in the south
Answer:
with there wings
Explanation:
birds have wings that flap up and down when they fly and this process repeats over and over
What directions do periods go on a periodic table
Answer:
left to right
The periods go on a periodic table, left to right. The periodic table is the systematic arrangement of elements in row and column.
What is a periodic table ?The chemical elements are arranged in rows and columns in the periodic table, sometimes referred to as the periodic table of the elements. It is often used in physics, chemistry, and other disciplines, and is frequently regarded as a symbol of chemistry.
Because of the orderly arrangement of the elements, it is known as the periodic table. Periods refers to the horizontal rows, and Groups to the vertical columns.
The most significant role of hydrogen in the human body is to maintain your level of hydration, making it the most significant element on the periodic table.
All known elements are grouped together in the periodic table of elements into groups with related characteristics. It becomes a crucial tool for chemists, nanotechnologies, and other scientists as a result. You can forecast how chemicals will behave if you learn to utilize and comprehend the periodic table.
Thus, The periods go on a periodic table, left to right.
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(PLS HELP!) Explain the layout of the modern periodic table, including rows, columns, groups, and blocks. Be sure to explain what’s in each part of the periodic table.
Answer: The rows of the periodic table represent the highest energy level of that element.
The columns represent how many valence electrons that element has.
Groups are the same thing as columns, they represent how many valence electrons am element has.
The blocks of the periodic table represent what sublevel(s) the valence electrons fill.
Explanation: Yes
Answer:
I can help!
Explanation:
Blocks
Atomic symbol is the one- or two-letter symbol for each element.
Atomic number is the number of protons in the nucleus, which determines the order of elements on the periodic table. This is also the total number of electrons in neutral atoms of the element.
Atomic mass is the mass in grams of 1 mole of atoms. Note that 1 mole contains 6.022·1023 atoms.
Groups
The first two groups of the periodic table(Alkali metals and Alkali Earth metals) are the s-block. Note that helium, in the last column of the table, is also part of the s-block. The outermost electrons of these elements are in s orbitals.
The transition metals make up the d-block, with electrons filling d orbitals. The lanthanides and actinides make up the f-block, with electrons filling f orbitals.
Groups 13 through 18,(post transition metals, metalloids, Reactive nonmetals, and Noble gases-)except for helium, make up the p-block. The outermost electrons of these elements are in p orbitals.
Sections
Metals are more likely to lose valence electrons
nonmetals are more likely to accept electrons.
Metalloids may act like metals or nonmetals, either losing or gaining valence electrons depending on the situation.
Transition metals(groups 3-12) behave somewhat differently because they can lose electrons from their outermost s or d orbitals.
Noble gases are the elements in group 18 that don’t tend to react with other elements. Noble gases have completely filled outer electron shells, as you can see because they’re at the end of each period. The electrons in these elements are stable, making the elements unreactive.
Periods and Groups
Groups of elements have similar properties in terms of how they react with other elements.
All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor.
Hope this helps!!
Changes in ________ move matter from one state to another.
Answer: energy
Explanation:hope this helps.
Answer:
Temperature
Explanation:
what kind of bond is between a halogen and an alkali metal
How many moles are in 234.4 grams of oxygen
Answer:
7.325 mol.
Explanation:
use the formula n=m/mr
so that makes:
234.4/16*2
which is 7.325 mol.
Please answer this it’s due tomorrow I’ll give you brainliest
Answer:
The answer is the last one
Explanation:
1. Give
2.me
3. Brainliest
4.please
Answer:
Explanation:
I’m not sure friend but my best guess would be 2 and 4. If it’s wrong I’m sorry but that seems the most reasonable to me. Good luck :)
A little boy places an ice cube in his hot bowl of stew and then walks out of the room. When he returns, the ice cube is gone.
Based on the law of conservation of mass, what happened to the ice cube in the scenario?
a. The extreme temperature difference between the stew and the ice cube caused the ice cube's mass to be converted into energy.
b. The extreme temperature difference between the stew and the ice cube caused the stew's mass to destroy the ice cube's mass.
c. The extreme temperature difference between the stew and the ice cube caused the ice cube to change state while its mass remains the same or constant.
d. The extreme temperature difference between the stew and the ice cube caused the ice cube's mass to shrink to a barely noticeable amount.
Answer:
It's actually C
Explanation:
The Ice's mass was never destroyed, just converted therefore it would be C, which states the mass never disappeared, just changed to water.
A. Can you use mass alone to predict whether an object will sink or float?
Answer:
yess
Explanation:
