Answer:
A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus and minus signs.
Explanation:
8. Which of the following elements reacts like calcium (Ca) but with less atomic
mass?
Potassium (K)
Magnesium (Mg)
Strontium (Sr)
Scandium (Sc)
Answer:
Magnesium (Mg)
Explanation:
An element with a lower atomic mass than Calcium that has similar chemical property is the element Magnesium (Mg).
This because, elements in the same group or family on the periodic table has similar chemical properties.
Magnesium belongs to the same group as Calcium, other elements are:
Be Mg Ca Sr Ba Ra
The group is made of the alkaline earth metals. They have two valence electrons in their outer shell.
2Al+3Cl2---> 2AlCl3 (i cant remember if this is balanced equation or not if not can you do that too? thank you i appreciate it.)
If I have 5.0 g Aluminum how much AlCl can I produce?
Step 1 convert grams Al to moles Al: (the dashes resemble a fraction)
5.0 g Al
----------- times -------------- =
Step 2: convert mol al to mol AlCl3
0.19 mol Al
---------------- times --------------- =
1
step 3: convert MOL AlCl3 to GRAMS AlCl3
0.19 mol AlCl3
--------------------- times ---------------- = 25.4 g AlCl3
1
THIS FIRST # PART PROBLEM IS STOICHEMITRY for chemistry if you know please help me out I have been struggling on this for a week now..thank you so much.
This next part is LIMITING REACTANTS:
If Al produces 25.4 g of AlCl3 and Cl2 gas produces 20.0 g AlCl3 what is my limiting reactant, Al or C2??
How do i determine my percent yeild if my actual yeild is 19.5g???
i put a link to the picture!!
Answer:
the equation is balanced bro
What is the percentage of each element? Mg(NO3)2
Please give an explanation!!
Answer:
Magnesium (Mg) is 1, Nitrogen is 2, and Oxygen is 6
Explanation:
the reason Nitrogen is 2 and Oxygen is 6, is because the number after the parenthesis means you have multiple whatever is inside the parenthesis by that number.
How is cosmic microwave background radiation evidence for the Big Bang?
Answer:
In explanation,
Explanation:
Tests of Big Bang: The CMB. The Big Bang theory predicts that the early universe was a very hot place and that as it expands, the gas within it cools. Thus the universe should be filled with radiation that is literally the remnant heat left over from the Big Bang, called the “cosmic microwave background", or CMB.
Which term answers the question "how fast in what direction"
Question 3 options:
position
distance
velocity
speed
Help Plzz Will give all points
Answer:
reqirured mediem
Explanation:
Answer:
reqirure a mediem
Explanation:
help me pls
. About how often does the Moon complete an orbit around Earth? ?
Answer:
approximately 27 days
Explanation:
Calculate the mass (in g) of 2.1 x 1026 atoms of Os.
Answer:
66326.8 g Os
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
2.1 × 10²⁶ atoms Os
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of Os - 190.2 g/mol
Step 3: Convert
[tex]2.1 \cdot 10^{26} \ atoms \ Os(\frac{1 \ mol \ Os}{6.022 \cdot 10^{23} \ atoms \ Os} )(\frac{190.2 \ g \ Os}{1 \ mol \ Os} )[/tex] = 66326.8 g Os
Step 4: Check
We are given 2 sig figs. Follow sig fig rules and round.
66326.8 g Os ≈ 66000 g Os
The mass of a sample of silver(Ag) is 53.93 g. How many atoms does it contain?[Ag=107.86]
Answer:
3.01 × 10²³ atoms
Explanation:
Given data:
Mass of sample of silver = 53.93 g
Number of atoms of silver = ?
Solution:
Number of moles of silver:
Number of moles = mass/ molar mass
Number of moles = 53.93 g/ 107.86 g/mol
Number of moles = 0.5 mol
Number of atoms of silver:
1 mole = 6.022 × 10²³ atoms
0.5 mol × 6.022 × 10²³ atoms /1 mol
3.01 × 10²³ atoms
what is part of the modern atomic model but no previous model.
A) a nucleus
B)circular electron paths
C)A positive particle
D) electron clouds
Answer: D
Explanation:
I don’t have an explanation. I got the answer wrong, I put “Circular electron paths”, when really it’s Electron Clouds.
Answer:D : Electron Clouds
Explanation:
is defined mathematically, describing a region with a high probability of containing electrons
Helium (He) and neon (Ne) are elements in Group 8A of the periodic table. How do the electron dot diagrams of these elements compare?
The electron dot diagram of helium has six fewer dots than the electron dot diagram of neon.
The electron dot diagram of helium has eight fewer dots than the electron dot diagram of neon.
Both the electron dot diagram of helium and the electron dot diagram of neon have two dots.
Both the electron dot diagram of helium and the electron dot diagram of neon have eight dots.
Answer:
The electron dot diagram of helium has six fewer dots than the electron dot diagram of neon.
Explanation:
Answer:
Answer:
The electron dot diagram of helium has six fewer dots than the electron dot diagram of neon.
Explanation:
Explanation:
can someone just plz answer the question I just posted there is no time please
Answer:
yes
Explanation:
were is it
Which of the following is a compound?
A. Ne
B. N2
C. NaCl
D. O2
Answer:
C
Explanation:
Answer:
NaCl
Explanation:
Because it's sodium chloride
Which of the following statements are true about effusion of gases.
A. At the same temperature, lighter molecules move at a higher velocity than heavier ones.
B. Diffusion and effusion are similar because both involve the motion of gas molecules from
regions of higher concentration to lower concentration.
C. Effusion involves the movement of gas molecules through a small hole in a container.
D. According to Graham's Law, the relative rates of effusion of two gases is directly proportional
to the squares of their molar masses.
Effusion refers to the movement of a gas through a small hole. It is different from diffusion which involves the movement of a gas from a region of higher concentration to a region of lower concentration.
The effusion of a gas is described by Graham's law. According to Graham's law, the rate of effusion of a gas is inversely proportional to the square root of the molar mass of the gas.
The following are true regarding the effusion of a gas;
At the same temperature, lighter molecules move at a higher velocity than heavier ones.Effusion involves the movement of gas molecules through a small hole in a container.Learn more: https://brainly.com/question/8804761
can you easily make 1-bromopentane as the only product from the reaction of 1 pentene with HBr and why
How does electroplating use electrolysis
Answer:
Electroplating is the process that uses electric current to reduce dissolved metal ions by the use of electrolysis, to obtain the dissolved metal ions at the other electrode, mostly in the format of a uniform coating.
how can we tell a piece of metal is hot
Answer:
touch it :)
Explanation:
Answer: I Believe The answer to this question is to hover your hand over the piece of Metal, life what'd you do in a house fire to tell if the doorknob is hot.
Explanation:
A rock _____ can get polished from water running over it?
A. in between other rocks
B. in a river
C. On top of a mountain
D.Under a sidewalk
Answer:
The answer is B. A river is a body of water, therefore, there will always be some water running over the rock.
Answer:
The answer is: B
Explanation:
The reason for this is because when a rock is underwater (the river, in this case), the water runs across it non-stop until the rock is removed from the water. The only way it can be polished if it is submerged under the water for quite some time (years and years).
I hope this helped! :))
Why
are the physical properties of isotopes differ slightly from each other?
Answer:
Isotopes of an element have different physical properties.
Hope I can help you have a nice day.
A given sample of a gas has a volume of 3 liters at a
pressure of 4 atmospheres. If temperature remains
constant and the pressure is changed to 6
atmospheres, the P x V product will equal
A). 9 B) 12 C) 18 D) 24
Answer:
B) 12
Explanation:
Given parameters:
Initial volume = 3L
Initial pressure = 4atm
Final pressure = 6atm
Unknown:
Final volume = ?
Solution:
To solve this problem, we apply Boyle's law which states that "the volume of a fixed mass of a gas varies inversely as the pressure changes if the temperature is constant".
P₁V₁ = P₂V₂
P and V are pressure and temperature values
1 and 2 are initial and final states.
PV product = 3 x 4 = 12
The [tex]P \times V[/tex] product of this given sample of gas is equal to: B) 12 atm.
Given the following data:
Initial volume = 3 Liters Initial pressure = 4 atm. Final pressure = 6 atm.To determine the [tex]P \times V[/tex] product of this given sample of gas, we would apply Boyle's law:
Boyle's law states that when the temperature of an ideal gas is kept constant, the pressure of the gas is inversely proportional to the volume occupied by the gas.
Mathematically, Boyle's law is given by the formula;
[tex]PV = k\\\\P_1V_1 = P_2V_2[/tex]
Where;
P is the volume of a gas.V is the pressure of a gas.Substituting the given parameters into the formula, we have;
[tex]P \times V = 4 \times 3\\\\P \times V = 12\;atm[/tex]
Find more information: https://brainly.com/question/1437490
Which has the higher average temperatures, white dwarfs or supergiants?
Answer:
White dwarfs are hotter
Explanation:
Can you divide II by another factor and still have it be correct? Why or why not?
Answer:
no, because factors can not be divided
Explanation:
The energy released in cellular respiration helps an athlete perform. How do you think an athlete might be able to increase cellular respiration?
Answer:
by eating healthy food and having a balanced diet also by exercising
An athlete might be able to increase their cellular respiration through the consumption of a balanced diet along with a regular exercising pattern.
What is Cellular respiration?Cellular respiration may be defined as a process through which organisms break down the molecules of glucose within the cell in order to avail energy in form of ATP for metabolic and cellular processes.
As we all know that glucose molecules and oxygen are the reactants for cellular respiration. So, a better level of glucose can be availed by a healthy and balanced diet and a standard oxygen level can be availed through a regular exercising pattern.
Therefore, an athlete might be able to increase their cellular respiration through the consumption of a balanced diet along with a regular exercising pattern.
To learn more about Cellular respiration, refer to the link:
https://brainly.com/question/2809259
#SPJ2
If the molecules of two different substances have a similar size but the molecules of one substance are polar while the molecules of the other substance are nonpolar, what is most likely true about the substances? The polar substance has a lower boiling point than the nonpolar substance. The nonpolar substance has a lower boiling point than the polar substance. Both substances have similar volatilities. Both substances have similar solubilities.
Answer:
The nonpolar substance has a lower boiling point than the polar substance
Explanation:
What causes polarity is how the electrons of the molecules in each substance are being shared. To have a polar substance/molecule it means that the electrons are not equally shared and when there is non-polar molecule we have that the electrons are shared evenly.
For instance, let's say we have a chemical Compound AB. If AB is polar it means that the electrons here are not evenly distributed, thus we will have one of the molecules to be positive and the other to be negative, say A^- and B^- = A^-B^-. Hence, they have polar bonds.
The bonds in polar substance are stronger than the one in non polar substance thus we have lower boiling point in non-polar substance(the bonds are held together by weak forces) and a high boiling point in a polar substance.
Answer:
B.) The nonpolar substance has a lower boiling point than the polar substance
Explanation:
edge 2021
The picture shows two lightbulbs powered by a solar cell. Describe the
energy transfers that make the bulbs light, starting with energy from the
Sun.*
Answer:
light energy --> electric energy ----> light and heat energy by the bulb
Explanation:
The energy transfers that make the bulbs light, starting with energy from solar energy to electrical energy and from electrical energy to heat & light energy.
What is energy transfer?Transfer of energy is a process in which one form of energy will convert into other form of energy, and total energy during this conversion is conserved. When the solar energy comes from the Sun and falls on the solar panel, then PV cells that are present in the panel will absorb this solar energy and generate electrical charge. This electrical charges are responsible for the flow of internal electricity inside the cell.This generated electricity used by the bulbs to generate light energy as well as heat energy.
Hence, Solar energy will convert in to electrical energy which in turn converts into light and heat energy.
To know more about conservation of energy, visit the below link:
https://brainly.com/question/166559
calculate the amount in moles of so3 form when 0.36mol so2 react with excess o2
Answer:
0.36 moles
Explanation:
Given data:
Number of moles of SO₃ form = ?
Number of moles of SO₂ react = 0.36 mol
Solution:
Chemical equation:
2SO₂ + O₂ → 2SO₃
Now we will compare the moles of SO₃ with SO₂.
SO₂ : SO₃
2 : 2
0.36 : 0.36
Thus, from 0.36 moles of SO₂ 0.36 moles of SO₃ formed.
The lead pipe has a mass of 200 g, how much will be left after 6 months?
Answer:
33g
Explanation:
200 divided by 6=33.33
If a substance begins with 64 atoms of radioisotope,how many will remain after two half-lives 
which state of matter has the highest kinetic energy
Answer:
gases
Explanation:
Their atoms are the least far apart
635 mL of a gas is at a pressure of 8.00 atm. What is the volume of the gas at standard pressure (1 atm) (STP)? (Boyle)
Answer:
5080 mLExplanation:
The volume of the gas at standard pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
From the question we have
[tex]V_2 = \frac{635 \times 8}{1} \\ [/tex]
We have the final answer as
5080 mLHope this helps you