Answer:
a )0.05 moles of O₂
b) 1.1207 dm³
c) 0.3× 10²³ atoms of oxygen
d) 1.6 g
Explanation:
Given data:
Number of molecules of O₂ = 3.01 × 10²² molecules
Number of moles of O₂ = ?
Volume of oxygen at ATP = ?
Number of oxygen atoms = ?
Mass of oxygen = ?
Solution:
The given problem will solve by using Avogadro number.
"It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance". The number 6.022 × 10²³ is called Avogadro number.
Moles of oxygen:
1 mole = 6.022 × 10²³ molecules
3.01 × 10²² molecules × 1 mol / 6.022 × 10²³ molecules
0.05 moles of O₂
Number of atoms of oxygen:
1 mole = 6.022 × 10²³ atoms
0.05 mol × 6.022 × 10²³ atoms /1 mol
0.3× 10²³ atoms of oxygen
Volume of oxygen:
1 mole of oxygen at STP occupy 22.414 dm³
0.05 mol × 22.414 dm³ / 1mol
1.1207 dm³
Mass of oxygen:
Mass = number of moles × molar mass
Mass = 0.05 mol × 32 g/mol
Mass = 1.6 g
Name two test substances that would react with each other to produce water and salt
Compound Lattice Energy (kJ/mol) Compound Lattice Energy (kJ/mol) LiF 1030 NaCl 788 LiCl 834 MgCl2 2326 LiI 730 AlCl3 5376 Lattice Energy 1 Lattice Energy 2 For the lattice energies given above … in Lattice Energy 1, explain why LiF has a greater lattice energy than LiI in Lattice Energy 2, explain why NaCl has a smaller lattice energy than AlCl3
Answer:
The lattice energy decreases down the group and increases across the period, therefore, the lattice energy of LiF > lattice energy of LiI, and the lattice energy of NaCl < the lattice energy of AlCl₃
Explanation:
The given parameters are;
Compound [tex]{}[/tex] Lattice Energy (kJ/mol)
LiF [tex]{}[/tex] 1030
NaCl [tex]{}[/tex] 788
MgCl₂ [tex]{}[/tex] 2326
LiI [tex]{}[/tex] 730
AlCl₃ [tex]{}[/tex] 5376
Lattice is the energy that must be added in order to split one mole of a ionic solid compound into gaseous ions
Given that the force of attraction between charges is inversely proportional to the square of the distance separating the charges, we have that as the atomic radius increases progressively down the group, the lattice energy decreases, therefore, LiF which has a shorter inter nuclear distance than LiI due to fluorine, F, being higher up on the periodic table than iodine, I, has a greater lattice energy than LiI
Similarly, given that the atomic radius decreases across the period, and that sodium, Na, comes before aluminum, Al, as we move across period 3, of the periodic table, the inter nuclear distance between atoms of in NaCl is larger than the internuclear distances between the atoms of AlCl₃, as well as the presence of more chlorine atoms in AlCl₃ than in NaCl, the lattice energy of NaCl is smaller than the lattice energy of AlCl₃.
Suppose 50.0 grams of compound AB reacts completely with 100.0 grams of compound CD, how many grams of products will be formed, according to the Law of Conservation of Matter?
a. 50
b. 100
c. 150
d. 200
Answer:
Option C = 150
Explanation:
First of all we will understand what is law of conservation of mass.
Law of conservation of mass:
This law stated that, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
In given photosynthesis reaction:
6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂
there are six number of carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of chemical equation so this reaction followed the law of conservation of mass because mases are same on both side.
In given chemical reaction:
AB + CD → X
50 g + 100 g = 150 g
Thus option c is correct.
A student was performing a series of experiments to verify the density of a liquid. The table shows the results of four experiments. Which of these statements is correct?
Experiment No. Density (g/cc)
1 0.70
2 0.81
3 0.80
4 0.81
A) The mean of the data is 0.7.
B) The mean of the data is 0.8.
C) The median of the data is 0.70.
D) The median of the data is 0.81.
Answer:
0.8
Explanation:
since when you add them up you get 3.12 and divide it you get 0.78. Round and you will get 0.8
Fill in the [?]: 12,341 us = [?] S
Please answer correctly..
will give the brainliest!
Urgent!!!!!!
Which element has a greater atomic radius? Fluorine or Potassium
Answer:
An atom is a basic unit of a chemical element, such as hydrogen, helium ... a fluorine atom since the three additional protons the fluorine has will pull its ... As an example, potassium (K) has a larger average atomic radius (
what is the diference between weather. and climate
Answer:Whereas weather refers to short-term changes in the atmosphere, climate describes what the weather is like over a long period of time in a specific area. Different regions can have different climates. ... Weather tells you what to wear each day. Climate tells you what types of clothes to have in your closet.
Explanation:well bc i am in 10th grade this kinda easy lol hoped i helped
Answer:
Explanation:
Weather is the current state of weather while, climate is the most common weather of that region over a time of 30 years.
Use the periodic table to determine the charge of the ions below. Select the correct answer from the drop-down menus.
A lithium ion has a charge of ______
A calcium ion has a charge of _______
An aluminum ion has a charge of ______
A fluorine ion has a charge of _______
An oxygen ion has a charge of ________
Answer:
A lithium ion has a charge of +1.
A calcium ion has a charge of +2.
An aluminum ion has a charge of +3.
A fluorine ion has a charge of -1.
An oxygen ion has a charge of -2.
Below, the correct charges of the elements are listed;
A lithium ion has a charge of +1 A calcium ion has a charge of +2 An aluminum ion has a charge of +3 A fluorine ion has a charge of -1 An oxygen ion has a charge of -2The ionic or electrical charge of an element is the new state the element acquires because of losing or gaining an electron.
When elements lose their electrons, they tend to attain a positive charge and when they gain an electron, they tend to acquire a negative charge. To easily identify the charge of the ions, the periodic table should be used.
Elements (metals) found on the left side of the periodic table tend to have a positive charge while elements (non-metals) on the right side of the table usually assume a negative charge.
Learn more here:
https://brainly.com/question/18734103
Obsidian is a best fit to which of the following categories?
O Mineral
O Rock
O Mineraloid
O Mineralistic
limestone is a common building block used in texas and is a type of rock that forms in shallow marine settings due to selective precipitation some of the dissolved ions present in the marine setting are sodium potassium calcium nitrate chloride carbonate which ions form limestone
Answer:
Ca^+ and CO3^2-
Explanation:
Limestone is CaCO3. It is an important component of the shell of many species that have shells.
Limestone contains th calcium ion (Ca^+) and the carbonate ion (CO3^2-).
Limestone is used as a building material. It is usually mined as deposits below the ground.
Assess It!
#4
Which two elements are
most likely to bond with
each other?
A. Oxygen and Boron
B. Nitrogen and 3 atoms of
Hydrogen
C. Chlorine and Calcium
D. Neon and Sodium
Answer:
c
Explanation:
i hope this helps
The two chemical elements that are most likely to bond with each other are: C. Chlorine and Calcium.
A chemical bond refers to the forces of attraction existing between ions, crystals, atoms or molecules and that are typically responsible for the formation of new chemical compounds.
In Chemistry, there are three (3) main types of chemical bonds and these are:
I. Hydrogen bonds.
II. Covalent bonds.
III. Ionic bonds.
An ionic bond can be defined as a chemical bond which involves a metallic element transferring one or more electrons to a non-metallic element.
In this scenario, the element Chlorine which have seven valence electrons would accept an electron from Calcium (Alkali metal) to form a chemical compound called calcium chloride.
In conclusion, two chemical elements that are most likely to bond with each other by forming an ionic bond are Chlorine and Calcium.
Read more: https://brainly.com/question/24605723
Plz help! The best answer will be marked as brainliest!
Make a funny sentence for flammability and compounds for Magnesium
Here is an example for Mercury, it HAS to for Magnesium
“I love to travel but I do corrode aluminum so we won’t be flying off on adventures in airplanes planes anytime soon”
Answer:
I literally just answered this question
Explanation:
Give me a brainliest
PLS HELP NOW!!
1. List the functions of the respiratory system. - [Answer]
2. Describe the path that a molecule of oxygen takes as it moves from the air into the alveoli. - (Answer)
3. Explain what happens to carbon dioxide in the blood that flows through the capillaries in the alveoli. - [Answer]
4. Why does air rush into your body when you inhale? - (Answer]
5. When there is a lot of dust in the air, people often cough and sneeze Fynliniul
Answer:
1:Gas Exchange – oxygen and carbon dioxide.
Breathing – movement of air.
Sound Production.
Olfactory Assistance – sense of smell.
Protection – from dust and microbes entering body through mucus production, cilia, and coughing.
Explanation:
What is the movement of particles in gas?
Answer:
The movement is random
Explanation:
How many non metals are there in benzoic acid?
Answer:
There are 3 non-metals in benzoic acid.
Explanation:
They are Hydrogen, Oxygen, and Carbon.
A graduated cylinder is filled with 50.7 mL of water. If a 10.0 g piece of zinc metal is added to the water, and the volume rises to 52.1 mL, what is the density of the metal?
Answer:
The answer is 7.14 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 10 g
volume = final volume of water - initial volume of water
volume = 52.1 - 50.7 = 1.4 mL
We have
[tex]density = \frac{10}{1.4} \\ = 7.142857...[/tex]
We have the final answer as
7.14 g/mLHope this helps you
5. Why does saliva production in the mouth decrease demineralization?
When all the values in a data set are written in order from least to greatest, the value that is in the middle, wth an equal number of values below it and equal number of values above it, is called the Omedian O mean O mode Orange
Option A, median is the correct answer
NEED ANSWER FAST✴️✴️✴️✴️
What do phytoplankton do for the carbon cycle? Choose all that apply.
A. They take in oxygen for photosynthesis.
B. They take in carbon dioxide for photosynthesis.
C. When they die, the carbon left in them can be sequestered (stored) in the ocean bottom.
D. They are food for many animals, including some whales.
Find the number of moles of 49.0 grams of H3PO4
Given parameters:
Mass of H₃PO₄ = 49g
Unknown:
Number of moles = ?
Solution:
To find the number of moles of a given specie;
number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass = 3(1) + 31 + 4(16) = 98g/mol
Input the parameters and solve;
Number of moles = [tex]\frac{49}{98}[/tex] = 0.5mole
The number of moles is 0.5mole
How many protons, neutrons, and electrons does the atom above have?
-12 protons, 7 neutrons, 1 electron
-7 protons, 12 neutrons, 1 electron
-12 protons, 5 neutrons, 7 electrons
-7 protons, 5 neutrons, 8 electrons
-7 protons, 5 neutrons, 1 electron
-7 protons, 12 neutrons, 8 electrons
-5 protons, 7 neutrons, 8 electrons
Answer:
Nitrogen has 7 protons, 7 neutrons, and 7 electrons.
So, I'm not entirely sure about the choices you provided :)
Do you know when the transfer of heat/thermal energy has ended
Which of the following resources carries a high potential for environmental damage
A:wind
B:trees
C:geothermal
D:nuclear
Answer:
Nuclear
Explanation:
Nuclear is a un-natural and newer type of energy source that can spread lethal toxins into the air causing living things to die. On top of that is it sometimes very unstable and sometimes if it's not disposed correctly it can cause high levels of radiation.
The atomic number equals:
O The number of protons and the number of neutrons.
O The number of protons and the number of electrons.
The number of electrons and the number of neutrons.
O The number of protons plus the number of neutrons.
Answer:
B- the number of protons and the number of electrons.
Explanation:
The atomic number equals the change on the nucleus. It therefore also equals the number of protons in the nucleus and also equals numerically the number of electrons in thw neutral atom. The atomic number has the symbol Z.
State two function of blood in our
body?
Answer:
transporting oxygen and nutrients to the lungs and tissues
forming blood clots to prevent excess blood loss
carrying cells and antibodies that fight infection
Explanation:
.......(◍•ᴗ•◍).......
Using the enlarged metric ruler segment shown below, what is the length of the
blue line in centimeters?
Answer:
1.8 cm
Explanation:
To measure length, use a metric ruler. It is separated into centimeter-sized units. One centimeter is represented by each number on the ruler. The longest mark is the centimeter.
What is the enlarged metric ruler segment?A metric scale is used to quantify traits or variables. Interval scales, ratio scales, and absolute scales are all grouped under the phrase “metric scale.”
The majority of statistical calculations and comparisons are possible with quantitative numerical values.
To the nearest tenth of a centimeter (0.1 cm), a metric ruler, for instance, may measure length. Using a separate metric ruler, you can measure lengths to the nearest 0.05 centimeters (0.05 cm).
The measurement with the lowest degree of uncertainty (0.05 cm) is more accurate.
Therefore, 1.8 cm is the length of the blue line in centimeters.
Learn more about metric ruler segment here
https://brainly.com/question/14397307
#SPJ2
Typically, water runs through the baseboard copper tubing and, therefore, fresh hot water is constantly running through the piping. However, consider a pipe where water was allowed to sit in the pipe. The hot water cools as it sits in the pipe. What is the temprature change, (ΔT), of the water if 210.0 g of water sat in the copper pipe from part A, releasing 3178 J of energy to the pipe? The specific heat of water is 4.184 (J/g)⋅∘C.
Answer:
-3.617 °C
Explanation:
Step 1: Given data
Mass of water (m): 210.0 g
Energy released in the form of heat (Q): -3178 J (the minus sign corresponds to energy being released)
Specific heat of water (c): 4.184 J/g.°C
Temperature change (ΔT): ?
Step 2: Calculate the temperature change
We will use the following expression.
Q = c × m × ΔT
-3178 J = 4.184 J/g.°C × 210.0 g × ΔT
ΔT = -3.617 °C
Count the number of electrons in the innermost shell for helium, chlorine and potassium. How
many are there?
Answer:
Helium is 2 electrons
Chlorine is 7 electrons
Potassium is 1 electron
and also Potassium is going to give chlorine an electron and do ionic bonding because chlorine is missing one electron and potassium has only 1 electron in valence
Explanation:
Outermost shell is the outermost ring so just count black dots on there for each one
!DUE SOON PLEASE HELP!
Classify the chemical equations as being balanced or not balanced.
CaO + 3C → CaC2 + CO
Na + H2O → 2NaOH + H2
4Fe + O2 → 2Fe2O3
2Mg + O2 → 2MgO
Answer:
balanced;
unbalanced;
unbalanced;
balanced;
Explanation:
CaO + 3C → CaC2 + CO //all elements are balanced
Na + H2O → 2NaOH + H2 //Na is not balanced on the left
4Fe + O2 → 2Fe2O3 //O is not balanced on the left
2Mg + O2 → 2MgO //left is equal to right, balanced