Answer:
elements tend not to react with other elements, there were no oxide compounds for Mendeleev to study. –Group 18 elements are generally unreactive. sodium ion is smaller because the sodium atom lost one electron. –An Na+ ion is smaller because it has one fewer electron shell.
Explanation:
can you me as brainliest if its right? i just need a few more to rank up! ^-^
Also have a great day and good luck in your studies!
Identify one cause of the loss of forests that is not intentional.
Answer:
Natural causes are unintentional.
Explanation:
An example would be a wildfire. This natural disaster spreads quickly, especially in forests where wood burns easily. Destroying forests through burning causes nutrients to get depleted, and organisms die.
Based on the electron configuration of the two
atoms, predict the ratio of metal cationic (+) atom
to nonmetal anionic (-) atom in the compound.
Hydrogen 1s
Fluorine 1s22s22p5
A. 2:3
B. 1:2
C. 1:1
D. 3:2
Answer:
1 per 2 berarti a.2:3 berarti bagi bagi 1 22. 22 sama dengan 5
Question 13(Multiple Choice Worth 5 points)
(03.05 MC)
Liquid X has a pH of 7 and Liquid Y has a pH of 8.5. Which statement is true?
Liquid X is a base and Liquid Y is an acid.
Liquid X is an acid and Liquid Y is a base.
Liquid X is neutral and Liquid Y is a base.
Liquid X is an acid and Liquid Y is neutral.
Answer:
Liquid X is neutral and Liquid Y is a base
Explanation:
Acid: pH<7
Neutral: pH=7
Base: pH>7
how many moles of carbonate are there in sodium carbonate
There are 0.566 moles of carbonate in sodium carbonate.
CALCULATE MOLES:The number of moles of carbonate (CO3) in sodium carbonate (Na2CO3) can be calculated by dividing the mass of carbonate in the compound by the molar mass of the compound. no. of moles of CO3 = mass of CO3 ÷ molar mass of Na2CO3Molar mass of Na2CO3 = 23(2) + 12 + 16(3)= 46 + 12 + 48 = 106g/molmass of CO3 = 12 + 48 = 60gno. of moles of CO3 = 60/106 no. of moles of CO3 = 0.566molTherefore, there are 0.566 moles of carbonate in sodium carbonate.Learn more about number of moles at: https://brainly.com/question/1542846
Please help me with this question please just help me with what is this is or synthesis singlereplacement
combustion
decomposition
double replacement
Answer:
1) Combustion
2)Synthesis
3)Single Replacement
4)Decomposition
5)Double Replacement
6)Synthesis
7)Double Replacement
8)Single Replacement
9)Combustion
10)Decomposition
Explanation:
Remeber, decomposisition is breaking things apart, synthesis is building them, cobusion will always make water and CO2 and will always burn O2, single replacemnt will have 1 thing replaced (single) and double replacement will have 2 things replaced (double).
Hope this helps!
using the formula F=ma, what force is required to accelerate a car weighing 642 kg at 13 m/s2
REALLY NEED HELP RN
HELP ME ?
PLEASE!??
Answer:
8,346 kmxm/s2
Explanation:
this is physics not chem but you just multiply 13 by 642 to get 8,346. also I'm sorry but it's easy
LAST ATTEMPT! Covalent compound naming !
S2Cl4 = Disulfur Tetrachloride
C5Br8 = N/A
Cl2O3 = Dichlorine trioxide
H2S3 = Trisulfane
Formula: N4S4 = Trisulfur Tetrafluoride
Formula: CBr4 = Hexanitrogen trisulfide
Formula: SiO2 = Heptasilicon
Carry learning!
Stay safe!
Study hard!
is H2O polar or non polar?
Answer:
Explanation:
H2O is a polar molecule
Answer:
polar covalent molecule
Explanation:
the unequal sharing of electrons between the atoms and the unsymmetrical shape of the molecule means that water has two pole a positive and a negative.
The metal which burns with a white dazzling flame is:
a) silver
b) magnesium
c) gold
d) aluminum
Answer:
MagnesiumMagnesium burns with a dazzling white flame to form magnesium oxide a powdery mass.
Explanation:
Hope this helps you !!Answer:
b) Magnesium
Explanation:
According to G double O gle, it doesn't react with cold water but reacts to hot water/steam to form magnesium. Hydroxide and Hydrogen gas is released into the air!
a. Anna's chemistry class is going to be experimenting with AgNO3 today, which
can stain hands and clothes. Anna is concerned about her jewelry, so as she
gets ready for school, she removes her gold (Au) ring andreplaces it with a
cheaper nickel (Ni) ring. Is this a good idea? Explain your answer. (3 points)
Answer:
No. While gold would not react with a silver nitrate solution, nickel would.
Explanation:
Refer to the metal reactivity series.
Reactivity: [tex]\text{Gold} < \text{Silver} < \text{Nickel}[/tex].
Gold is positioned after silver in the reactivity series, meaning that gold is typically less reactive than silver. Thus, gold would not react with a solution of silver ions to produce silver metal.
However, since nickel is positioned before silver in the reactivity series, it is expected that nickel would react with silver ions in this solution to produce silver metal.
Thus, if the silver nitrate solution comes into contact with the two rings, the nickel ring would likely react with the solution, the gold ring would not.
3 useful applications of alkaline earth metals
Answer:
1 used in paint , toothpaste
2 used in fireworks and magnets
3 used to manufacture alloys
If there is a name/surname you can't make out due to a speaker's manner of speech, what are you supposed to do?
We can call a person by the word gentleman and Sir or from his/her real name.
If there is a name/surname you can't make out due to a speaker's manner of speech then I will call him gentleman or Sir or I will ask him his real name. Gentleman is a word that is used for noble person and Sir word is also used in order to give someone respect.
Call a person with his real name is also comes under the manner of speech so we can conclude that we can call a person by the word gentleman and Sir or from his/her real name.
Learn more about manner of speech here:
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what is the mass number of an atom that has six protons. six electrons, and eight neutrons?
Mass number is the sum of the total number of nucleons (neutrons + protons) present in the atom.
Mass number = Protons + Neutrons
Mass number = 6 + 8
Mass number = 14
_______
Hope it helps ⚜
calculate the mass percentage of each element in aluminum oxide.Then calculate themass of aluminum in a 3.62 gram sample of of aluminum
1. The mass percentage of each element in aluminum oxide Al₂O₃ are:
i. The mass percent of Al in Al₂O₃ is 52.9%
ii. The mass percent of O in Al₂O₃ is 47.1%
2. The mass of Al in 3.62 g of Al₂O₃ is 1.73 g
1i. Determination of the percentage of Al
Molar mass of Al₂O₃ = (2×27) + (3×16) = 102 g/mol Mass of Al of Al₂O₃ = 2 × 27 = 54 gPercentage of Al =?Percentage = mass / mass of sample × 100
Percentage of Al = (54 / 102) × 100
Percentage of Al = 52.9%
1ii. Determination of the percentage of O
Molar mass of Al₂O₃ = 102 g/mol Mass of O of Al₂O₃ = 3 × 16 = 48 gPercentage of O =?Percentage = mass / mass of sample × 100
Percentage of O = (48 / 102) × 100
Percentage of O = 47.1%
2. Determination of the mass of Al in 3.62 g of Al₂O₃.
102 g of Al₂O₃ contains 54 g of Al.
Therefore,
3.62 g of Al₂O₃ will contain = (3.62 × 54) / 102 = 1.73 g of Al.
Thus, 1.73 g of Al is present in 3.62 g of Al₂O₃.
Learn more about percentage composition: https://brainly.com/question/3940233
Convert 23 grams of nitrogen dioxide into moles of nitrogen dioxide.
Answer:
We have to convert the following into moles.
(a) 32 g of oxygen gas = 1 mole
1 gram of oxygen gas = 1/32 mole
Given that 12 g of oxygen gas
No: of moles = given mass / molar mass
= 12 / 32 = 0.375 mole
(b) 18 g of water = 1 mole
1 gram of water = 1/18 mole
Given that 20 g of water
No: of moles = given mass / molar mass
= 20 / 18 = 1.111 mole
(c) 44 g of carbon dioxide = 1 mole
1 gram of CO2 = 1/44 mole
Given that 22 g of carbon dioxide
No: of moles = given mass / molar mass
= 22 / 44 = 0.5 mole
Explanation:
50 PTS!!!! No links pls!
What is a title name for Aerobic cellular respiration?
Answer:
Like another name?
Aerobic cellular respiration is also called aerobic metabolism, cell respiration, and oxidative metabolism.
Explanation:
4 Mg & 3 Cu(NO3)2 + Cu(NO3)2 (aq) + Mg(NO3)2 (aq) + Cu (s)
balance?
Here you go
Mg + 2CuNO3 → Mg(NO3)2 + 2Cu
°ω° Which statement best describes the skier? The skier has potential and kinetic energy. The skier has only potential energy. The skier has only kinetic energy. The skier does not have potential or kinetic energy. °ω°
A compound has the following percentage composition: 40.0% carbon, 6.72% hydrogen, 53.28% oxygen. What is the amount of carbon moles in 200g of the compound?
Answer:
So we're trying to find the number of carbon moles in the compound. We know that we have 200g of the compound and that 40% of it is Carbon. and 40% of 200 is 80g (change 40% into a decimal and multiply it by 200 and you get 80g)
So 80g of the compound is carbon. In order to find the moles of Carbon, I have to divide the mass by the molar mass of the element.
We know from our periodic table that the molar mass for carbon is 12g/mol
[tex]\frac{80}{12} = 6.67\ mol[/tex]
Therefore we have 6.67 moles of carbon in the compound
Answer:
6.67 moles of carbon in compound
Determine the frequency of light with a wavelength of 2.672 x 10^-7cm
Answer:
Determine the frequency of light with a wavelength of 2.775⋅10−7 cm. Answer in units of Hz?❤
why brain remembers picture better than words?
Answer:
your brain processes ever detail in a picture rather than words for for example a picture of something words doesn't describe it as well as the picture could.
26. Which group in the periodic table contains
an element that can form a blue sulfate
a
compound?
(1) 1
(2)
(3) 11
(4) 17
Answer:
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Answer:
Option (3) 11
Explanation:
Elements in Group 11 of the periodic table are called Noble Metals.Noble metals have high resistance to oxidation and low chemical reactivity.Noble metal includes Gold (Au), Silver (Ag), Copper (Cu).Copper forms a blue sulfate when reacts with Sulphuric Acid.Formula of Copper Sulfate : CuSO4.Since, Copper belongs to the Group 11 elements of the periodic table hence, option (3) is the right answer.For more information:
https://brainly.com/question/569321
Dentists use a soft, clay-like material to make a filling for a cavity. The filling stays soft under the light of the dentist’s lamp, but it hardens when the dentist shines an ultraviolet flashlight on it. Why does light from the ultraviolet flashlight harden the filling when light from the lamp does not?
Answer:
the clay will be melted by the light
Explanation:
because UV rays are hot but in a way, human skin can not feal pain
Describe echolocation. Give an example of an animal that uses echolocation.
dolphin and whales use echolocation
Sort the sentences based on whether they describe the properties of a heterogeneous or a homogenous mixture.
Answer:
Carbonate Sodium Hydrogen
The boiling point of a liquid is tested at 10 different pressures, from 0.5 to 1.4 atmospheres. The results of the tests show that
there is a nearly constant increase in boiling point for each increase in pressure. Which conclusion is reasonable based on this
information? (1 point)
O A boiling point at 1.5 atmospheres could not be predicted with any certainty at all.
O A boiling point at 15 atmospheres could not be predicted with any certainty at all.
O A boiling point at 1.5 atmospheres could be predicted fairly well.
O A boiling point at 15 atmospheres could be predicted fairly well.
Since the increase in boiling point with increasing pressure is fairly constant, then, the boiling point at 1.5 atmospheres could be predicted fairly well.
We say that a substance has reached its boiling point when its pressure equals the atmospheric pressure. Recall that we can be able to make predictions from the results of an experiment.
In this case, we are told that there is a nearly constant increase in boiling point for each increase in pressure. Therefore, it is reasonable to conclude that, a boiling point at 1.5 atmospheres could be predicted fairly well.
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If 2.5 moles of PA react completely, how many
moles of P203 are formed?
Answer:
For every 2 moles of Na used, 2 moles of NaCl are produced.
Explanation:
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How many moles are present in 885.46 grams of sodium bicarbonate NaHCO 3 ) ? Molar mass of sodium bicarbonate ( NaHCO 3 )=84.01 g/mol A. 6.3471 x 10^ 24 moles; 0.9877 * 10 ^ - 2 * m * o * l * e * s C. 10.540 moles D 84.007 moles
Answer:
C. 10.540 moles
Explanation:
divide grams by molar mass to get moles
how many sightings of fish in spongebob were there, person who gets it right will get brainliest on god on everything
a sample of glucose contains 1.250x10^21 carbon atoms, how many atoms of hydrogen does it contain?
Answer:
Hydrogen = 2.5 * 10^21
Explanation:
Chemical Formula Glucose: C₆H₁₂O₆
One of the ways you could do this is to notice that for every carbon atom there are two Hydrogen atoms. You can state this more formally by using the formula to set up a ratio: 12/6 = hydrogen to Carbon
So if there are 1.250 * 10^21 Carbon atoms in the Glucose sample, then there will be twice as many hydrogen atoms.
H = 2 * 1.25 * 10^21 = 2.5 * 10^21 atoms
You could do this more formally by setting up a proportion.
6 Carbon / 12 Hydrogen = 1.25*10^21 / x Cross Multiply
6*x = 12 * 1.25*10^21 Combine the right
6x = 1.5 * 10^22 Divide by 6
x = 2.5 * 10^21
