Answer:
39.095
Explanation:
this is because all this isotopes belong to a single element thus
(38.96×93.26)+(39.96×0.012)+(40.96×6.73)
answer of that divided by 100%
Which statement correctly describe the nucleus of the atom
Protons,neutrons,electrons
Write balanced equations for the reaction of Mg(OH)2 with stomach acid (HCl). Express your answer as a chemical equation. Identify all of the phases in your answer.
Answer:
Mg(OH)₂(s) + 2HCl(aq) ----> MgCl₂(aq) + 2H₂O(l)
Explanation:
Magnesium hydroxide is a white solid that is sparingly soluble in water. It is a basic hydroxide, therefore it neutralizes acids to form salt and water.
Magnesium hydroxide commonly used as an antacid, for example milk of magnesia, because it reduces stomach acid, and increases water in the intestines which may induce bowel movements. It also relieves indigestion, sour stomach, and heartburn. Magnesium hydroxide is also used as a laxative to relieve occasional constipation.
The equation for the reaction between magnesium hydroxide and stomach acid, HCl, is as follows:
Mg(OH)₂(s) + 2HCl(aq) ----> MgCl₂(aq) + 2H₂O(l)
What happens to the energy of gas particles when an elastic collision takes place?
Answer:
Kinetic energy might transferred from one particle to another during an elastic collision, but i don't think that there is going to be any change in the total energy of the colliding particles. Because there are no forces of attraction or repulsion between gas particles .
Explanation:
3. Calculate the mass of the candle burned during this experiment.
4. Calculate the molar mass of candle wax (C24H) using the formula from question 1.
5. Calculate the moles of candle wax burned
Answer:
suthu naaye mairu poda
If you stretch a rubber band between your fingers and pluck it, the rubber band makes a sound from the vibration. True Or False
Answer:
True
Explanation:
All solutions
are mixtures; but
all mixtures are
not solutions.
why?
All solutions are mixtures of two or more substances, but unless the mixture has a homogeneous distribution of solutes in the solvent, then the mixture is not a solution. Therefore, all mixtures are not solutions.
Balanced or Unbalanced
K+2MgBr=KBr+Mg
This item is used for small cuts and peeling.
1-Chef Knife
2-Pizza Cutter
3-Kitchen Shears/Scissors
4-Paring Knife
2)
MgCl2 + Li,CO, → Mgco, + 2 LICI
Answer:
double replacement
Explanation:
A sample of radioactive material starts with 80 grams. After 3 half-lives have passed, how much radioactive sample remains?
Answer:
After 3 half lives 10 g of radio active material left.
Explanation:
Given data:
Total amount of radio active material = 80 g
Amount left after 3 half lives = ?
Solution:
At time zero = 80 g
At first half life = 80 g/2 = 40 g
At 2nd half life = 40 g/2 = 20 g
At 3rd half life = 20 g/2 = 10 g
Thus, after 3 half lives 10 g of radio active material left.
A gene is being copied to be passed from a parent to an offspring. While being copied from the parent, a
small change happens to the gene so that it is not the same. A copying error. What is it called when this
occurs?
Mitosis
Mutation
Carrier
Clone
Can someone answer 3’for me please?
4. Look at the equation below and determine what fitsI in the empty box.
14 C --> 4 N+
?
re
c. en TH
What belongs in the empty box?
A.
В.
e
D.
Answer:
Beta particles
Explanation:
A beta emission is said to occur when a neutron is converted into a proton. When a beta emission takes place, the daughter nucleus increases it's atomic number by 1. A neutrino is also produced.
Since the mass number remain the same but the daughter nucleus has it's atomic number increased by 1, then the particle is a beta particle.
Density = Mass
Volume
To find the density of a solid:
Find the mass of the block.
Find the volume of the block using (length x width x height)
Use the equation to find density.
#1 #2 #3 #4 #5 = (2x3x4) #1/#5
Block #
Mass (g)
Length (cm)
Width (cm)
Height (cm)
Volume
(cm3)
Density (g/cm3)
1
75
6
3
4
72
1.04
2
3
4
5
6
7
8
Follow up questions:
Which two blocks were made out of the same material?
How do you know?
Does a larger block always have a higher density?
Answer:
what is it all about???
You take a balloon with fixed volume and submerge it in a hot tub for a few minutes. What would you expect to happen to the pressure of the balloon after you take it out? Explain.
Answer:
pressure will be high because the temp is high, the gas is gonna expand
Explanation:
when temp increases it causes gas to expand which causes high pressure. this is because pv=nrt, p=pressure in atmosphere, v is volume in liters, n is number of particles in moles, t is temp in kelvin is r is ideal gas constant
The impact on the pressure should be high since the temperature should be high due to which the gas should be expanded.
What is pressure?Pressure refer to the force applied that should be perpendicular to the surface of an object per unit area so that the force is distributed. In the case when the temperature should be increased so here gas should be expanded that resulted into the high temperature.
Here the following formula should be applied
pv = nrt
Here p = pressure
v means the volume
n means no of particles in moles
r means the ideal gas constant
learn more about pressure here: https://brainly.com/question/4417455
An object is placed at 0 on a number line. It moves 3 units to the right, then 4 units to the left, and then 6 units to the right. What is the displacement of the object? 1 5 7 13
Answer:
5
Explanation:
Edge
Answer:
5
Explanation:
The list identifies various properties of four elements:
Element 1 is a gas at room temperature.
Element 2 is a solid which conducts electricity.
Element 3 is a gas with an effective nuclear charge of +7.
Element 4 is malleable and can take the form of a shiny solid sheet.
Based on this list, which elements are metals?
A. Elements 1 and 3
B. Elements 1 and 4
C. Elements 2 and 3
D. Elements 2 and 4
Answer: D
Explanation: I guessed it and got it right
A fundamental object that is difficult to divide into smaller bits is known as an element. Therefore option D is correct.
What is element ?An element is a species of atoms, including the pure material made entirely of that species, that have a specific number of protons in their nuclei. Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.
An element is a material that cannot be broken down by non-nuclear processes in chemistry and physics. A discrete component of a larger system or collection is referred to as an element in computers and mathematics.
Metals, nonmetals, and metalloids are the Periodic Table's three main groupings. Each group's constituent elements share comparable physical and chemical characteristics. Among the physical characteristics used to separate the three groups are, A substance's capacity to reflect light is referred to as luster.
Thus, option D is correct.
To learn more about element follow the link below;
https://brainly.com/question/13025901
#SPJ2
The image seen here is caused by events __________ Earth's surface.
A) above
B) at
C) on
D) under
A sample of gas occupies a volume of 350.0 mL at 840mm Hg and 33°C. Determine the volume of this sample at 600 mm By and 52°C
Answer:
V₂ = 520.42 mL
Explanation:
Given data:
Initial volume = 350.0 mL
Initial pressure = 840 mmHg
Initial temperature = 33°C (33 +273 = 306 K)
Final temperature = 52°C (52+273 = 325 K)
Final volume = ?
Final pressure = 600 mmHg
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 840 mmHg × 350.0 mL × 325 K / 306 K × 600 mmHg
V₂ = 95550000 mmHg.mL.K /183600 K.mmHg
V₂ = 520.42 mL
Identify three things that change about particles and their interactions, during phase changes.
Answer:
you knsiebedi djd dud ud dud djd du dud djd did d
Answer:
change of state,solutiom(dissolving substances),mechanical changes
The Earth and the spaceship both have mass. The astronaut is attracted to Earth by gravity, but he is not attracted to the spaceship. Explain.
How many molecules are in 5 moles of O2?
Answer: 6.02 × 10^24
Explanation:
A mixture of 10.0 g of Ne and 10.0 g of Ar has a total pressure of 1.6 atm. Estimate the partial pressure of Ne in this mixture.
Answer:
1.0atm is partial pressure of Ne
Explanation:
Partial pressure of a gas is mole fraction times total pressure. To find mole fraction of Ne we need to convert mass of Ne and Ar to moles using the molar mass of each atom and with the formula:
Mole fraction Ne = Moles Ne / (Moles Ne + Moles Ar)
We can solve for mole fraction of Ne and its partial pressure:
Moles Ne -molar mass: 20.1797g/mol-:
10.0g * (1mol / 20.1797g) = 0.496 moles of Ne
Moles Ar -Molar mass: 39.948g/mol-:
10.0g * (1mol / 39.948g) = 0.250 moles of Ar
Mole fraction of Ne:
0.496 moles Ne / (0.496moles + 0.250moles) = 0.665
Partial pressure Ne:
1.6atm * 0.665 =
1.0atm is partial pressure of Ne
I need help on my homework I don’t know this answer
Answer:
I believe the answer would be
b.) valence electrons, all thw electrons that surround the nucleus of an atom
Explanation:
You're welcome
Occurs when the membrane surrounds a large substance and engulfs it.
) Active Transport
O Diffusion
O Endocytosis
Exocytosis
A 22.6 gram sample of krypton gas has a volume of 904 milliliters at a pressure of 2.71 atm. The temperature of the Kr gas sample is:_____
Answer:
110.78 K
Explanation:
First we convert 22.6 g of krypton gas (Kr) to moles, using its molar mass:
22.6 g Kr ÷ 83.798 g/mol = 0.270 mol KrThen we use the PV=nRT formula, where:
P = 2.71 atmV = 904 mL ⇒ 904/1000 = 0.904 Ln = 0.270 molR = 0.082 atm·L·mol⁻¹·K⁻¹T = ?2.71 atm * 0.904 L = 0.270 mol * 0.082 atm·L·mol⁻¹·K⁻¹ * T
And solve for T:
T = 110.78 Ka gas occupies 600.0 ml at 20.00 degrees C and 70.00kPa what will be the pressure at 40.00 degrees C and 150.0mL?
Answer:
P₂ = 299.11 KPa
Explanation:
Given data:
Initial volume = 600 mL
Initial pressure = 70.00 KPa
Initial temperature = 20 °C (20 +273 = 293 K)
Final temperature = 40°C (40+273 = 313 K)
Final volume = 150.0 mL
Final pressure = ?
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
P₂ = P₁V₁ T₂/ T₁ V₂
P₂ = 70 KPa × 600 mL × 313 K / 293K ×150 mL
P₂ = 13146000 KPa .mL. K /43950 K.mL
P₂ = 299.11 KPa
How many moles of hydrogen are needed to completely react with 2.41 moles of nitrogen
Which of the following is an example of balanced forces?
O a ball rolls down the street
O a car drives backwards
O a tug-o-war game where neither team is able to gain an advantage
O a tug-o-war game where the team on the left pulls the other team over the line
Answer:
C. tug-o-war game where neither team is able to gain an advantage
Explanation:
All living things are made up of one or more
O A) Chloroplasts
OB) Prokaryotes
OC) cells
OD) Units
Answer:
c cells
Explanation:
learned that in 7th grade
