Answer:
the answer is 2 valence electrons
CaCO3
How many atoms of oxygen are in one
molecule of calcium carbonate?
A 1
B3
C5
D6
Answer:
B. three atoms of oxygen
What is a Physical reaction?
Examples of physical change include?
A. Melting
B. Boiling
C. Freezing
D. All of these are examples of physical change
Answer:
All of these examples are physical changes.
Explanation:
Physical changes are changes affecting the form of a chemical substance, but not its chemical composition.
Which are examples of harmful mutations? Check all that apply. One that causes a person to have a light patch of hair color one that changes a mouse's eye shape but not its eyesight O one that allows a moth to blend into its environment one that reduces a bean plant's ability to make food one that increases the plants susceptibility to disease
Answer:
one that reduces a bean plant's ability to make food
one that increases the plants susceptibility to disease
Explanation:
Genetic mutation refers to the changes in the arrangement of the bases that make up a gene. This sudden change may have positive or negative consequences for the individual specie.
Some genetic mutations actually alter a gene's sequence of bases but do not alter the function of the particular protein that the gene in question makes.
The two options chosen in the answer shows situations in which a genetic mutation causes harm to the organism involved.
Answer:
2, 4, and 5
Explanation:
what is chemistry about
Answer:
Explanation:
Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything.
Answer:
its the science that deals with the properties, composition, and structure of substances like elements and compounds, the transformations they undergo, and the energy that is released or absorbed during these processes
Which statement best describes how entrepreneurship affects a society's
economy?
A. It encourages people to take risks to create new products.
B. It organizes the people who help a business operate.
C. It provides the raw materials needed to produce goods.
D. It supplies businesses with the tools they need to function.
Answer:it’s a
Explanation:cause
A scientist is studying the liquid shown here. She thinks the liquid is a mixture. Describe an investigation she could do to demonstrate that the liquid is in fact a combination of substances.
( please help it’s due today lol! i will mark your answer as brainliest or whatever .)
Answer: Measure the density
Explanation: pretty sure the density could identify if it is a mixture or a pure substance
What element have 5 energy levels of electrons. Which as an atom the last electron is found in the 5p^3
Answer:
I hope this answer is correct
Explanation:
Element having electronic configuration 1s
2
,2s
2
,2p
6
,3s
2
,3p
6
,3d
10
,4s
2
,4p
6
,4d
10
,5s
2
,5p
3
which element has an atom with the following composition? 24 protons, 28 neutrons and 24 electrons.
a screwdriver has a volume of 0.418 cubic centimeters. it also has the mass of 2.3 grams. what is the screwdrivers density
Answer:
The answer is 5.50 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{2.3}{0.418} \\ = 5.50239234...[/tex]
We have the final answer as
5.50 g/cm³Hope this helps you
Answer:
Comets are cosmic snowballs of frozen gases, rock and dust that orbit the Sun. When frozen, they are the size of a small town. When a comet's orbit brings it close to the Sun.
Explanation:
Is carbon dioxide a polar molecule? Why or Why Not?
Explanation:
Carbon dioxide isn't a polar molecule because
same nature of charge appears in opposite direction which cancel each other. So, carbon dioxide is non-polar molecule.
How many molecules are in 1.35 mol of CS2
Answer:
There are there are 8.13-10^25
Explanation:
N(CS2)= 1.35* (times) 6.02-10^ 25= 3.13-10^25 molecules
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 8.12×10²³ molecules are in 1.35 mole of CS[tex]_2[/tex].
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample. There are so many formula for calculating mole.
we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number
number of atoms/molecules=number of moles × 6.022×10²³(Avogadro number)
number of moles of CS[tex]_2[/tex] = 1.35 mol
Substituting all the given values in the above equation, we get
number of atoms/molecules= 1.35 × 6.022×10²³
number of atoms/molecules=8.12×10²³ molecules
Therefore, 8.12×10²³ molecules are in 1.35 mole of CS[tex]_2[/tex].
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If a boulder sits at rest on top of a mountain what conclusion can be made about the forces acting on the
A boulder sits at rest on top of a mountain. What conclusion can be made about the forces acting on the boulder? The forces acting on the boulder are balanced (net force equals zero).
If a boulder sits at rest on the top of the mountain , the forces acting on the boulder are zero as it is in the state of rest.
What is a 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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43. Why is the geometric structure of a molecule
important, especially for biological molecules?
Answer:
A slight change can change the molecule’s usefulness to the cell.
Explanation:
who Organized elements into four groups based on propertie
Alien Periodic Table
Answer:
IT IS REAL
Look it up
Answer:
look close the answers are circled in blue
the answer to number 2 is element #14, Yorkel
Which of the following is not a gas in the Earth's atmosphere? A. oxygen B. carbon dioxide C. sulfur D.nitrogen 1
Help meh, please !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
volume of 200mL, density shows it weighs .789 grams for every mL. .789*200= 157.8 grams
Explanation:
PLEASE HELP 30 POINTS
Because the rock is irregularly shaped, you used the displacement method to measure its volume.
You used (______) to indirectly find the (_____) of the objects.
Options for the 1st fill in the blank:
- a balance
- calculations
- a graduated cylinder
Options for the 2nd fill in the blank:
- density
- mass
- area
Answer:
balance for the 1st and mass for the 2nd
(this is 6th grade science so that’s the closet subject I could find) Do you know an adult who drinks coffee, tea, or soda pop? Think about that person and picture them in your mind. Write a description to help that person understand how they can smell their favorite beverage even though it’s a liquid.
Answer:
Well you could boil the liquid, That would make steam from the liquid. Noramlly you can smell steam.
Explanation:
anwser this ASAP please
Answer:
Its D :)
Or not i haven't done this in a while-
Calculate the maximum mass of potassium sulfate, K2SO4, that could be formed when 4.9 g of sulfuric acid reacts with excess potassium hydroxide.
H2SO4 + 2KOH → K2SO4 + 2H2O
Answer:
From 4.9 g of sulfuric acid 8.175 g of potassium sulfate is formed.
Explanation:
Given data:
Mass of H₂SO₄ = 4.9 g
Mass of K₂SO₄ formed = ?
Solution:
Chemical reaction:
H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
Number of moles of H₂SO₄:
Number of moles = mass/ molar mass
Number of moles = 4.9 g/ 98.1 g/mol
Number of moles = 0.05 mol
Now we will compare the moles of H₂SO₄ with K₂SO₄ .
H₂SO₄ : K₂SO₄
1 : 1
0.05 : 0.05
Mass of K₂SO₄:
Mass = number of moles × molar mass
Mass = 0.05 mol × 174.3 g/mol
Mass = 8.715 g
Thus, from 4.9 g of sulfuric acid 8.175 g of potassium sulfate is formed.
1. Which family of elements is most likely to lose electrons?
2. Which family of elements is most likely to gain electrons?
Answer:
Elements that are metals tend to lose electrons and become positively charged ions called cations.
Elements that are nonmetals tend to gain electrons and become negatively charged ions called anions.
Hope it helps:)
Metal are the family of elements which is most likely to lose electrons. Non metals are the family of elements which is most likely to gain electrons.
What is element?The quantity of protons an element has defines it. An element's atoms all contain the same amount of protons, but its electron and neutron counts might vary. Ions are produced by altering the electron to proton ratio, whereas isotopes are produced by altering the neutron count.
118 known elements are present. A study is being done to create element 120.1. The periodic table will have to be modified to include element 120 after it has been created and validated. Metal are the family of elements which is most likely to lose electrons.
Therefore, metal are the family of elements which is most likely to lose electrons.
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please anyone help me with this
Answer:
matter is anything that takes up space while elements are subtanxes that can be broken down
19. Chemical properties can be used to
(1) differentiate between two compounds
(2) determine the temperature of a substance
(3) determine the density of a substance
(4) differentiate between two neutrons
Answer:differentiate between two compounds i think!
Explanation: taking a test!
Answer:(1) differentiate between two compounds
Explanation:
A Chemical property tells us the characteristics of a particular matter or substance after a chemical change. This property helps us to differentiate a compound from another or differentiate elements or substances. Examples of a Chemical property are acidity, reactivity and heat, etc .
For example to differentiate between Water H2O and Hydrogen peroxide, H202
Even though they are made up of oxygen and hydrogen. Hydrogen peroxide (H2O2), has more(1) oxygen than water (H2O).
Using Acidity as a chemical property to differentiate these substances
Water, H20 is amphoteric in nature ie having both acidic and basic properties, while H202 is a weak acid.
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Metamorphic means “________________.”
A}to turn into rock
B]to make into minerals
C]to change form
D]to press down
In Greek metamorphic means 'to change form ' . Hence the answer to this question will be ;
C) To change form
What is the stable end product of the decay of uranium 238
Lead
Explanation:
by emission of alpha particles
The end product of the decay of uranium 238 is Pb-206.
Heavy elements are generally grouped into four decay series which are; Thorium series, Uranium series and actinium series and Neptunium series.
These heavy elements decay via a series of α and β emissions until a stable nucleus is finally achieved. All these decay series usually terminate in a lead nucleus.
Uranium 238 belongs to the uranium decay series and terminates at Pb-206.
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can you guys help me please? I dont get what im supposed to do here.
Urgent please help!!
Which of these is a chemical property of a substance?
A) texture
B) ductility
C) reactivity
D) conductivity
Answer:
reactivity
Explanation:
Can anyone explain to me how I solve 3x10^8 / 3.82x10^-7
I know the answer due to referring to the key but I'm not sure how they got it. Answer was 7.85x10^14
Answer:
You have to do this on a calculator. So when you put it in the calculator you will get 7.85x10^14.
3x10^8 is the speed of light. 3.82x10^-7 is the number in the question.
You can solve it like this
3x10^8
------------------
3.82x10^7
But you would do this on a calculator.