If 45.0 grams of magnesium hydroxide is heated, the amount of water that will be produced would be 13.90 grams
Stoichiometric calculationsFrom the equation of the reaction:
Mg(OH)₂ → MgO + H₂O
The mole ratio of Mg(OH)₂ to H₂O is 1:1
Mole of 45 grams Mg(OH)₂ = 45/58.33 = 0.77 moles
Thus, the equivalent mole of H₂O produced would also be 0.77 moles.
Mass of 0.77 moles H₂O = 0.77 x 18.02 = 13.90 grams
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Gadolinium (Gd) is element 64 on the periodic table. A sample contains 4.56×1022 atoms of Gd. What amount (mol) of Gd is present in a sample containing 4.56×1022 atoms?
Answer:
.757 moles of Gd is present in a sample containing 4.56x10^22 atoms of Gd.
Explanation:
Atoms --> Moles
1. Take the given number and put it over 1
(4.56x10^22 atoms/1)
2. Multiply by 6.022x10^23 to go from atoms to moles
(4.56x10^22 atoms/1) (1mol Gd/6.022x10^22 atoms)= .757223513...
3. Round by sigfigs
4.56 has three sigfigs
=.757 mols
3. A submarine fills a special storage area known as a ballast with water in order to
increase its density. This allows it to dive deeper in the ocean. When a submarine
needs to rise rapidly, compressed air is used to push the water out of the ballast.
What effect does replacing the water in the ballast with air have on the submarine?
A. The submarine's volume increases, lowering its density.
B. The submarine's mass decreases, lowering its density.
C. The submarine's mass increases, raising its density.
D. The submarine's volume decreases, decreasing its density.
Answer:
B; The submarine volume increases, lowering its density.
Explanation:
My teacher told me.
Chose the options that would be the proper procedures for cleaning up an acid spill?.
Answer:
Acid Spills (hydrochloric or sulfuric acid):
Neutralize spill with sodium bicarbonate/baking soda 2. Wait until bubbling/fizzing has stopped 3. When using a neutralizing spill kit, the kits are buffered and will not have a bubbling action.
Control and Containment of Spill
The first step in cleaning up a chemical spill should involve the control and containment of the spill. Before commencing the clean-up of a chemical spill, all personnel must be wearing the appropriate PPE including safety goggles, gloves and long-sleeve lab coats.
Jon is riding his bicycle around town. Which part of his ride shows the result of balanced forces? A. when he rides at a constant speed up a hill B. when he speeds up going down a hill C. when he rides at a constant speed while turning D. when he slows down on a level sidewalk
Answer:
d. when he slows down on a level sidewalk
Explanation:
that's a balanced force.
c. What is oxidized in the reaction? What is reduced? (2 points)
d. In this simple electrochemical cell, what functions as the anode? What is
the cathode? (1000000)
Answer:
Oxidation: a type of chemical reaction where one or more electrons are lost.
Oxidation State / Number: a number assigned to an atom describing its degree of oxidation, meaning how many electrons it has gained or lost.
Reduction: a type of chemical reaction where one or more electrons are gained.
Oxidation-Reduction Reaction: a chemical reaction where oxidation and reduction occurs simultaneously
Explanation:
Reduction always occurs at cathode
Oxidation always occurs in anode
These two process occurs in same way independent of nature of cell whether voltaic or electrolytic.
i need help badly
what is the individual element that make up HCI
Answer:
It is two elements, Hydrogen and Chlorine
Explanation:
Hydrochloric Acid is made with 1 hydrogen atom and 1 chlorine atom bonded with a single covalent bond
Answer: hydrochloric acid
Explanation: It is a compound of the elements hydrogen and chlorine, a gas at room temperature and pressure. And the solution of the gas in water is called hydrochloric acid. :) hope that helps
A chemist has 2.0 mol of methanol (ch3oh). the molar mass of methanol is 32.0 g/mol. what is the mass, in grams, of the sample? 16 grams 30 grams 32 grams 64 grams
The mass, in grams, of the sample of methanol is 64 grams.
What is relation between mass and moles?Mass of any substance will be calculated by using their moles as:
n = W/M, where
W = required mass
M = molar mass = 32.0 g/mol
n = moles = 2 moles
Now we put all these value on the above equation to calculate the mass of methanol as:
W = (2mol)(32g/mol)
W = 64g
Hence, correct option is (4) i.e. 64 grams.
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The answer to this question is option D: 64 grams
Explanation: Got 90% on the quiz on edge and got this answer right
a sample of gas with a volume of 30 ml with a temperature at 25
Answer: 55? I think
Explanation:
Clouds form from liquid water and ice True Or False ? IF U ANSWER QUICK I WILL GIVE U A BRAINLIEST
Answer:
False
Explanation:
from gas such as vaporization
is my ***** longer than yours?
A: Yes
B: No
PLS ANSWER FAST AHAH
distilled water is a pure substance
true or false ?
Answer:
True
Explanation:
If you see distilled water, it's a pure substance. That means that there are only water molecules in the liquid. A mixture would be a glass of water with other things dissolved inside, like one of those powders you take if you get sick or Kool-Aid.
URGENT!! 50 Points Please Help!! Will mark brainliest!! Assignment due in 30 minutes.
2.) Round off each of the answers correctly.
a.) 8.7g + 15.43g + 19g = 43.13g
b.) 4.32cm × 1.7cm = 7.3444[tex]cm^{2}[/tex]
c.) 853.2L - 627.443L = 225.757L
d.) 38.732[tex]m^{2}[/tex] ÷ 0.421m = 92.02375m
e.) 5.40m × 3.21m × 1.871m = 32.431914[tex]m^{3}[/tex]
f.) 5.47[tex]m^{3}[/tex] + 11[tex]m^{3}[/tex] + 87.300[tex]m^{3}[/tex] = 103.770[tex]m^{3}[/tex]
3.) Make the following conversions:
a.) 157cs to seconds
b.) 42.7L to milliliters
c.) 261nm to millimeters
d.) 0.065km to decimeters
e.) 642cg to kilograms
f.) 8.25 × [tex]10^{2}[/tex]cg to nanograms
a) The least number of decimal points is 0 so you should round the answer to 43.
b) The least number of significant figures is 2 so round to 7.3
c)The least number of decimal places is 1 so round to 225.7
d) The least number of significant figures is 3 so round to 92.0
e) The least number of significant figures is 3 so round to 32.4
f) The least number of decimal places is 0 so round to 104m^3
Basically, for addition and subtraction round to the least number of decimal places found in the factors, and for multiplication and division round to the least number of significant figures found in the factors.
I hope the picture is there this time, help asap
pretty sure its easy but i cant-
Answer:
Tryptophan is an essential amino acid that can be found in the genetic code of humans
1•) What is the universe made of?
2•) How did life begin?
3•) Are we alone in the universe?
4•) What makes us human?
5•) What is consciousness?
6•) Why do we dream?7 Why is there stuff?
8•) Are there other universes?
Mg + 2HCl --> H2 + MgCl2 How many moles of H2 will form from 20 moles of HCl
According to Reference Table I, which reaction has a heat of reaction equal
to -283 kJ/mole at 25°C and I atmosphere?
A) C(s) + O2(g) + CO2(g)
B) CO(g) + O2(g) + CO2(g)
C) N2 +102 + NH3(g)
D) 20 + 3H2 → CzH6
Phases of Matter—Comic Strip Template
Instructions: Create a comic strip detailing the adventure of your character as the character is exposed to thermal energy, causing it to undergo phase changes from a solid, to a liquid, to a gas. Place drawings inside the boxes and written content on the lines below each box.
Your presentation must include the following:
• title and introduction of your character, including what substance it is made of
• source of thermal energy your character encountered (conduction, convection, and/or radiation)
• detailed description and/or diagram of the particle transformation from solid to liquid phase
• detailed description and/or diagram of the particle transformation from liquid to gas phase
Title of your comic strip: James thermal energy Adventure__________________________
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Answer:
This will be a story. (comic can also be done with this. In fact it is better)
The title is the journey of the ice cube. (change it if you want)
Main character - ice cube
There was an ice cube made by the water from the freezer in an ice shop.
The ice cube, with a bunch of other ice cubes, were taken to be packed and sold to a restaurant. The ice cube was excited to where he was going while the other ice cubes are just meh. Now that the ice cubes arrived, a restaurant worker stores the ice cubes in a cooler and later used to put ice in a lemonade. While the lemonade in a glass cup was carried outside the porch of the restaurant by the waiter, the ice cube was fascinated by the environment of the restaurant. The waiter finally serves the thirsty customer and the customer drank almost half of the lemonade but the ice cube did not get in the man's mouth. Instead the other ice cubes went. The ice cube feared the person. Shortly after checking his phone, the customer was about to reach on to the glass until the hands accidentally pushes the glass over and falls. The ice cube and the remaining ice cubes spread away with the wasted lemonade liquid. No one bothered cleaning up the ice cubes, only the glass shards because the floor is a smooth concrete. Outside was really hot from the sun anyways so it would melt the ice cube and sooner evaporate. As it was in liquid form, the "ice cube" was feeling relaxed because it was just chilling on the floor. And when it evaporates, the ice cubes becomes more fascinated since it goes up to the sky while having a sky-view from above.
If Earth's mass doubled
without changing its size,
your weight would
Answer:
Answer: It will double our mass too .
Explanation: Because the gravitational force will be more and it will attract us more towards its surface which will result to more weight gain .
Explanation:
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A bicycle tire is filled with air to a pressure of 100. psi at a temperature of 19C. Riding the bike on asphalt on a hot day increases the temperature of the tire to 58?C. The volume of the tire increases by 4.0%. What is the new pressure in the bicycle tire?
Considering the direct relationship between pressure and temperature, the new pressure in the bicycle tire would be 63.01 psi
Gas lawThe general gas laws is given by:
P1V1/T1 = P2V2/T2
Where P1 = initial pressure V1 = initial volume T1 = initial temperature, P2 = final pressure, V2 = final volume, and T2 = final temperature.
In this case, P1 = 100 psi, V1 = 1, T1 = 19+273 = 292, P2 = ?, V2 = 1.4, T2 = 58+273 = 331
P2 = P1V1T2/T1V2
= 100x1x292/331x1.4
= 63.01 psi
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How does height affect the speed of a falling object?
How does height affect the speed of a falling object?
Answer :-Equation:- v²-u² = 2aS
let the case of body be dropped
u = zero ( initial velocity ) a = g ( constant falling under gravity)S = initial height of the body from the groundv = final speed of the bodyby further solving :-
v²-0 = 2aS
v² = 2aS
2a is constant
so :-
v is directly proportional to the √S
so we can say that speed of the falling body increase with increase in the square root of the height from which is dropped or falling
If a kitchen washcloth harbors microbes that can be transmitted to an individual to cause disease, then the washcloth is considered
an endospore.
a virus.
a biofilm.
a pathogen.
a fomite.
Answer:
it's fomite
Explanation:
hope it helps
Someone please answer quick.
How many molecules are in 5.5 mol of a ZnCL2 sample
Answer:
The answer is 136.286.
mr cleann
anybody know the answer
Answer:
i think c
Explanation:
If the molar mass of zinc is 65.39 g/mol. you have a 65.2g piece of zinc. how many moles of zinc are present?
Answer:
By dividing the two, we can determine the mol. And I have also inserteed the formula below
Explanation:
Moles of zinc present in the sample that have a mass of 65.2 g are 0.997 moles.
What are moles?
Moles are used to calculate the amount of substance to measure the small entity. It is calculated as:
[tex]\rm moles = \rm \dfrac{mass}{molar\; mass}[/tex]
Given,
Molar mass of zinc = 65.39 g/mol
Mass of zinc = 65.2 g
Moles are calculated as:
65.2/65.39 = 0.997 moles
Therefore, 0.997 moles of zinc are present.
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Give three examples of stimuli.
Answer: Hit the skin with a needle or pin is a good example of stimulus. The sudden removing of the hand is the response.
When somebody bangs a door you jump if you were unaware because of the sound. ...
Holding a hot plate we fling hand away from it.
Explanation: Hopefully this helps!
The bond angles around a carbon in a
double bond are______
and it
is______
hybridized.
A) 109. 5, sp^2
B) 120, sp ^3
C) 120, sp ^2
D) 109. 5, sp^3
Answer:
C. 120, sp²
Explanation:
3.0X1024 atoms of Au to moles
Answer:
5 moles Au
Explanation:
To convert atoms to moles, simply divide the given number of moles by Avogadro's number , ( 6.022 * 10^23 )
Given number of atoms of Au : 3.0 x 10^24
Number of moles : 3.0 x 10^24 / 6.022 x 10^23 = 5 moles ( rounded )
A rapid reaction between oxygen and fuel that results in fire.
Which of the below options is not a type of chemical bond?
magnetic attraction
ionic bond
covalent bond
polar bond
Answer:
magnetic attraction
Explanation:
Magnetic attraction is not a type of chemical bond while ionic bond, covalent bond and polar bonds are types of chemical bonds.
What is an ionic bond?Ionic bond or electrovalent bond is a type of bond which is formed between two elements when there is an exchange of electrons which takes place between the atoms resulting in the formation of ions.
When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge and forms an ion called the anion.
As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond.Compounds with ionic bonds are hard and have high melting points.These bonds usually exist in crystals.
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