Answer:
C
Explanation:
What was the first property used to organize the periodic table?
Answer:
Explanation:
atomic mass
In 1869, Mendeleev published the first periodic table of the elements. In his periodic table, Mendeleev arranged elements in rows by increasing atomic mass. Within a row, elements with lower atomic masses were on the left. Mendeleev started a new row every time the chemical properties of the elements repeated.
Use these images to identify each state of matter.
Match each image with the correct state of matter.
A:
B:
C:
A
B
С
Answer:
Just too clarify its actually
A: gas
B: solid
C: liquid
Answer:
She is correct the answerts above
Explanation:
brainliest good luck !!!
What type of fossil dating is the most accurate?
O Radiometric
O Dating
O Relative
O Approximate
DNA bases are attached to _____.
sugar molecules
both sugar and phosphate molecules
phosphate molecules
Answer:
sugar molecules......
How does the ionosphere affect radio frequencies?
Group of answer choices
FM frequencies are not reflected and shortwave frequencies are bounced off the ionosphere and back to Earth several times.
FM frequencies are bounced back to Earth and back several times.
Shortwave radio frequencies are absorbed by the ionosphere and FM frequencies pass through.
Shortwave radio frequencies are not affected and pass through the ionosphere.
Answer:Shortwave radio frequencies are not affected and pass through the ionosphere.
Explanation:
What is the name of the acid CH3COOH
Answer:
CH3COOH is Acetic acid.
Which are characteristics of metals that result from their bonding? Check all that apply.
are brittle
conduct electricity
in a gaseous state
are malleable
Answer:
B. Conduct electricity and D. Are malleable
Explanation:
Edge 2020 :)
Answer:
b and d on edge
Explanation:
edge 2021
give thanks please
Choose the correct answer. The color of the iguana is an adaptation to its:
A) food B) predators C) climate D) habitat
Explain your answer(s) in 1-2 complete sentences.
Answer:
B
Explanation:
so that way they can hide away from the predators
Explain how atoms are held together in covalent bonds. Give an example of a covalent compound.
Answer:
Explanation:
Atoms are held together by covalent bonds when they share electrons between themselves.
Covalent bonds are bonds that are formed between non-metals usually with a low electronegative difference between them. In this bond type, two non-metals donate electrons which are shared between the combining atoms and this makes them both like the corresponding noble gases. The shared electrons is what forms the covalent bonds.
An example of covalent bond is HCl, H₂S, SO₂, CO₂, O₂ etc
Hey I need help with 84-88
Answer:
84. 3
85. 6
86. 3
87. 6
Explanation:
84. 3
85. 6
86. 3
87. 6
3. The basic unti of matter *
proton
neutron
electron
atom
Answer:
Your answer is ATOM
Explanation:
Atoms consist of a nucleus made of protons and neutrons orbited by electrons. Atoms are the basic units of matter and the defining structure of elements.
Basically, they are the building block of life because everything made of matter has atoms
What is a "period"? What does it represent?|I
Answer: The end of a sentence
Explanation:
Answer:
it ends a sentence
Explanation:
I am 16 years old.
How many grams are there in 9.4 x 1025 molecules of H2?
Answer:
Mass = 312 g
Explanation:
Given data:
Number of molecules of H₂ = 9.4 × 10²⁵
Mass in gram = ?
Solution:
First of all we will calculate the number of moles of H₂.
1 mole of H₂ contain 6.022× 10²³ molecules
9.4 × 10²⁵ molecules × 1 mol / 6.022× 10²³ molecules
1.56× 10² mol
156 moles of H₂:
Mass in gram:
Mass = number of mole × molar mass
Mass = 156 mol × 2 g/mol
Mass = 312 g
How long does it take a p wave to travel 8,000 km
Answer:
11 minutes and 20 seconds
Explanation:
hope this helped:)
Consider the balanced chemical equation. H2O2(aq) + 3 I^-(aq) + 2 H+(aq) S I3^-(aq) + 2 H2O(l) In the first 10.0 seconds of the reaction, the concentration of I^- drops from 1.000 M to 0.868 M.
(a) Calculate the average rate of this reaction in this time interval.
(b) Predict the rate of change in the concentration of H (that is, ∆[H ]>∆t) during this time interval.
Based on the data provided, the rate of the given reactions are:
a. reaction rate = 0.0132 M/sec
b. rate of change of [H⁺] = 8.8 * 10⁻³ M/sec
What is the reaction rate?Reaction rate = change in concentration of reactant or product/ time taken
Change in concentration of I⁻ = 1.000 M - 0.868 M= 0.132
time taken = 10 s
reaction rate = 0.132/10
Rate of reaction = 0.0132 M/sec
Rate of change of [H⁺]From the equation of the reaction 3 moles of I⁻ are used up for every 2 moles of H⁺
Hence, the rate of change of [H⁺] = 0.0132 M/sec * 2/3
rate of change of [H⁺] = 8.8 * 10⁻³ M/sec
Therefore, the rate of the given reactions are:
a. reaction rate = 0.0132 M/sec
b. rate of change of [H⁺] = 8.8 * 10⁻³ M/sec
Learn more about reaction rate at: https://brainly.com/question/24795637
A family from Ottawa turned off the heat before flying to Florida for a winter holiday. When they came home, all of their water pipes had burst. What do you think happened?
Explanation:
In the extreme winters , the water inside pipes freeze, on freezing it's(water molecule) density decreases and volume increases and therefore, the ice then expands and pushes the water towards the faucet, causing high pressure buildup in the pipe and after a limit the pipe burst. This is what happened to the family in Ottawa, where winters are chilly.
Answer:
Since their family turned off the heat, it should be cold, the pipes must be freezing, and there is water in the pipes which means the water in the pipes is freezing causing it to burst.
Which statement BEST describes elements that would create the MOST polar bonds?
A) Elements from the top left and the bottom right of the periodic table.
B) Elements from the bottom left and the top right of the periodic table.
C) Elements from the top left and the top right of the periodic table.
D) Elements from the bottom left and the bottom right of the periodic table.
Answer: It is B) Elements from the bottom left and the top right of the periodic table.
Explanation: Elements from bottom left and top right will create the most polar bonds. electronegativity generally increased from bottom left to top right of the periodic table
Which is a homogeneous mixture?
a. pure substance
b. element
c. solution
d. compound
please help asap 18 points if help and right answer please
Answer:
Lithium = 8%
Bromine = 92%
Explanation:
To calculate percent composition, you must:
- Calculate the molar mass.
- Divide the subtotal for each element's mass by the molar mass.
- Convert to a percentage
With that being said, given LiBr (Lithium Bromide), calculate the molar mass:
Lithium has an atomic weight of 7, and there is one Lithium atoms in LiBr. Bromine has an atomic weight of 80, and there is one Bromine atom in LiBr:
[tex]1(7)\\1(80)[/tex]
Add the two products:
[tex]80+7[/tex]
[tex]=87[/tex]
The molar mass of LiBr is about 87 grams.
With that information, divide the subtotal of Lithium by the molar mass, and then multiply by 100 to convert to a percentage:
[tex]\frac{7}{87}[/tex] × [tex]100=[/tex]
8.0459%
(Round to nearest percentage):
8%
Therefore, the percent composition of Lithium in the compound Lithium Bromide is about 8%.
Now, divide the subtotal of Bromine by the molar mass, and then multiply by 100 to convert to a percentage:
[tex]\frac{80}{87}[/tex] × [tex]100=[/tex]
91.9540
(Round):
92%
Therefore, the percent composition of Bromine in the compound Lithium Bromide is about 92%.
Which substance is most likely to form in a precipitation reaction?
A) calcium nitrate
B) copper(I) nitrate
C) iron(I) chloride
D) iron(II) sulfide
E) potassium sulfate
Answer:
(d) Iron (II) sulfide (FeS) is precipitated most likely and is an renowned ore of iron. (e) Potassium sulfate (K₂SO₄) is like to remain mostly in its ionic form and has less tend to precipitate. Thus FeS will be more likely to be precipitated.
Explanation:
Brainliest please?
What is carbonization?
Answer:Carbonization is the conversion of organic matters like plants and dead animal remains into carbon through destructive distillation.
HOPE IT HELPS
For the people that can’t find the answer for this here it is
Answer:
wow
Explanation:
when the n quantum number equals 1 we are in what orbital
A)d
B) f
C)p
D)s
i think it is D i hope this helps yall
what element is this atom? need the answer in 30 minutes. Feel free to answer the other questions. NEED HELP!
Answer:
fluorine
Explanation:
I used the number of electrons to determine it.
Answer:
Ya, definetly fluorine if you want confirmation!
A 0.250 g sample of hydrocarbon (containing only carbon and hydrogen) undergoes complete combustion to produce 0.845 g of CO2 and 0.173 g of H2O. What is the empirical formula of this compound?
Answer:
CH
Explanation:
We have to obtain the mass of carbon and hydrogen in CO2 and H2O respectively.
For carbon in CO2;
0.845 * 12/44 = 0.23 g
For hydrogen in H20;
0.173 * 2/18 = 0.019 g
We convert the masses to moles of carbon and hydrogen
For carbon - 0.23/ 12 = 0.019 moles
For hydrogen - 0.019/1 = 0.019 moles
Dividing by 0.019 moles for carbon and hydrogen we have the emperical formula of the compound as CH
Chem please help theres a photo attatched
Answer:
the top one is 100.000 and bottom one is 100.000
Explanation:
HELP I NEED HELP!!!
Please I have 5 minutes left
Answer:
Engineering, I believe
What is the cause of discoloring of Taj Mahal
Answer:
Fossil fuels and biomass combustion.
Explanation:
The mass combustion of fossil fuels and biomass results in the vast release of Black Carbon (BC) and Brown Carbon (BrC) and dust. These Black Carbon, light absorbing organic Brown Carbon and dust cause the discolouring and yellowing of the surface of Taj Mahal building.
Answer:
Acid rain causes discoloring Taj Mahal
Explanation:
A calorimeter holds 125 g water at 22.0°C. A 45 g sample of silver at 130.0°C is added to the water, and the final temperature of the water and silver is 24.2°C. The specific heat of water is 4.18 J/g°C. What is the specific heat of silver?
Group of answer choices
0.241 J/g°C
2.16 J/g°C
51.8 J/g°C
558 J/g°C
Answer:
3
Explanation:
When Dora's Father puts oil in the car, he is protecting the engine from what force? a. Inertia b. Friction c. Velocity d. Motion btw its not chemistry its science-
Answer:
Friction
Explanation:
In the research scenario, Dora's father uses engine oil to shield engine pumps from friction and injury. Friction is a force among contact objects that slip or threaten to slide over each other.
