help me pls
. About how often does the Moon complete an orbit around Earth? ?
Answer:
approximately 27 days
Explanation:
Ca(OH)2 + 2HCl → CaCl2 + 2H2O Which of the following is true about the equation
Answer:
This equation is a double reaction
Explanation:
I hope this is the answer
Answer:
ca(OH)2 is the base and CaCI2 is the salt
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.
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
Which of the following has the largest atomic radius?
Na
CI
C
Mg
Be
Answer:
Na
Explanation:
On the periodic table, the atomic radius of an atom typically decreases when going from left to right and increases when going from top to bottom.
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 set in mathematics
Answer:
i dont get your question Man
In mathematics, a set is a well-defined collection of distinct objects
♥plz give me brain list it would really help a lot♥
♥ お力になれて、嬉しいです！♥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
What is the result of the process that occurs in the image?
Ionic Bonding (the transfer of valence electrons)
Answer:
Ok:
Explanation:
Sodium gives fluorine an electron. This is in part due to electronegativity differences because sodium likes to lose an electron and fluorine likes to gain. As a result, sodium and become positively charged and fluorine negatively charged. This will for electrostatic attraction and the sodium and fluorine will form a bond. This bond is called an ionic bond.
Molecules are related to matter because
Doing Science plz help
Answer:
My guess is b or c but its robably wrong
Explanation:
I just also need points sorry <3
What happens when the thermal energy of a substance increases?
Answer:
Both the motion of the particles in the substance and the temperature of the substance increase.
Answer The motion of the particles in the substance increases, and the temperature of the substance decreases.
Explanation:
A measured sample of argon gas has a volume of 20.0 L at a pressure of 660 mm Hg. What is the final volume
if the pressure is decreased to 550 mmHg?
O A. 5.5 L
O B. 17 L
OC. 24 L
OD. 240 L
Answer:
C . 24 L
Explanation:
Given data:
Initial volume of gas = 20.0 L
Initial pressure of gas = 660 mmHg
Final volume = ?
Final pressure = 550 mmHg
Solution:
The given problem will be solved through the Boly's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
660 mmHg × 20.0 L = 550 mmHg × V₂
V₂ = 13200 mmHg. L/ 550 mmHg
V₂ = 24 L
can you easily make 1-bromopentane as the only product from the reaction of 1 pentene with HBr and why
What are two reasons that ICl has a low melting point?
Answer:
1. It is a covalent bond and all covalent bonds have low melting points
Explanation:
when different atoms bond, the more electronegativity atom attracts electrons more strongly and acquires a slightly negative charge. true or false?
Answer:
Explanation:This unequal distribution of electrons is known as a polar covalent bond, characterized by a partial positive charge on one atom and a partial negative charge on the other. The atom that attracts the electrons more strongly acquires the partial negative charge and vice versa.
Which term answers the question "how fast in what direction"
Question 3 options:
position
distance
velocity
speed
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.
What type of bond occurs between tow nonmetals.
Answer:
covalent bonds............
covalent bonds
Ionic bonds structure when a nonmetal and a steel alternate electrons, while covalent bonds form when electrons are shared between two nonmetals. An ionic bond is a type of chemical bond formed through an electrostatic enchantment between two oppositely charged ions.
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:
what state of matter has more volume?
Answer:
please mark as brainliest
Explanation:
ans: Gas
The particles of matter in the gaseous state are neither close together nor fixed in place. The gas expands to fill its container. Thus, a given number of particles will have the greatest volume in the gas state.30/06/2014
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
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
explain what two-dimensional (2-D) and three-dimensional (3-D) models
are. Give an example of one you've seen recently.
Answer:
2D refers to the term “two-dimensional.”
3D refers to the term “three-dimensional.”
Explanation:
Circle, triangle, square, rectangle, and pentagon are some of the most common examples of 2D shapes.
Cylinder, pyramid, cube, and prism are some of the most common examples of 3D shapes.
NEED ASAP!!!
A rarefaction is a part of a sound wave where the particles are further apart than normal.
True
False
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
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.
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.
If a substance begins with 64 atoms of radioisotope,how many will remain after two half-lives 
54.2 g N
determine the number of moles
Answer:
3.87 mol N
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
54.2 g N
Step 2: Identify Conversions
Molar Mass of N - 14.01 g/mol
Step 3: Convert
[tex]54.2 \ g \ N(\frac{1 \ mol \ N}{14.01 \ g \ N} )[/tex] = 3.86867 mol N
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
3.86867 mol N ≈ 3.87 mol N