Answer:
Wag kang tatalon Kasi malayu ang talunan mo
Students in Ms. Brown demonstrated several chemical reactions but the data did not represent the law of conservation of matter in
any of the four experiments. Kai and Maria are about to add 3 grams of magnesium (Mg) to a test tube of 30 grams of hydrochloric
acid (HCI). They covered their container with a balloon as a seal. If the girls expect a chernical change as well as evidence of the
Law of conservation of matter, choose ALL of the predictions that are appropriate?
A)
There will be a rapid evolution of gas.
B)
The mass of the products will equal 339.
The solid magnesium metal will disappear.
D)
The balloon covering the container will expand.
E)
There will be a dramatic change in temperature,
Answer:
Answer: everything except E
Explanation: There was no dramatic change in temperature and i just took the assignment.
According to the law of conservation of matter, matter cannot be created not be destroyed. In this experiment, no matter loss will occur but there will be rapid evolution hydrogen gas and the balloon will expand.
What is conservation of matter?According to conservation of matter, matter can neither be created nor be destroyed but its state and properties can be changed. The total mass of the reactants will be equal to the total mass of the products.
Magnesium is a second group element and is a metal. Metal reacts with hydrogen halides to form metal halides and hydrogen gas as the reaction written below:
[tex]Mg +2 HCl \rightarrow MgCl_{2} +H_{2}[/tex]
The evolved hydrogen gas in this reaction tries to diffuses out the sealing and thus the balloon cover expands. And thus the solid magnesium metal disappears to form magnesium chloride.
The evolution of gases is exothermic and therefore, the temperature outside increases suddenly. There we can see bubbles of hydrogen in the reaction system.
Therefore, the changes that occur in the experiments are, rapid evolution of gases, solid metal disappears, sealing cover expands and there occur a rapid change in temperature. Thus options A,C,D,E are correct.
To learn more about of conservation of matter, refer the link below:
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85. Compare a mole of Ag-108 and a mole of Pt-195 using
atoms, protons, electrons, and neutrons.
Explanation:
1 mol of an atom (irregardless of the element) contains the Avogadro's number of atoms. This is given as;
1 mol = 6.022 * 10^23 atoms
For a neutral atom;
NUmber of protons = Number of electrons
The relationship between proton and neutron is given as;
Mass Number = Protons + Neutrons
Ag-108
Atoms = 6.022 * 10^23 atoms
Protons = Atomic Number = 47
Electrons = 47
Neutrons = Mass Number - Protons = 108 - 47 = 61
Pt-195
Atoms = 6.022 * 10^23 atoms
Protons = Atomic Number = 78
Electrons = 78
Neutrons = Mass Number - Protons = 195 - 78 = 117
Of the following choices, which is the best way to help Earth's water supply
last for future generations?
A. Build thermal power plants.
B. Reduce residential water use.
C. Promote private swimming pool construction.
D. Avoid drip irrigation systems on farms.
The best way for helping the earth water supply that should be last for future generations should be considered option b. where it decrease the residential water usage.
What is residential water?The average American family should be used for more than 300 gallons of the water per day at home. Approximately 70% of the use should arise indoors,
Moreover, outdoor water should be accounted for 30% of household that should be high in drier parts for the country and it should be more water intensive landscape.
Therefore, the option b is correct.
Learn more about water here: https://brainly.com/question/20229458
I NEED HELP PLZ HELP ME PLZ I WILL GIVE BRAINLESTTTTTTTTTTTTTTTTTTTTTTTT
I NEED HELP PLZ HELP MEEEEEEEEEEEEEEEEEEEEEEEEEEEEE I REALLY NEDDDDDDDDDDDDDDDDDDDDDDDDDD HELP PLZZZZZZZZZZZZZZZZZZZZZ HELP MEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE PLZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
Answer:
a
Explanation:
Explain the difference between ionic and covalent bonding using the following term(s)
A. Electronegativities
B. Types of atoms bonding
Answer:
R we gonna say what letter if were gonna say it its A
Explanation:
SBc Its Our Lesson Today In Science
Knowing that the molar mass of the compound is 46.069 grams/mole, use the formula weight calculated in part C to
determine the molecular formula.
Select the correct answer from each drop-down menu.
С_H_O_
Answer:
C2H2O1
Explanation:
I got it right on plato :>
C2H6O1 is the correct answer.
q=The+diagram+below+represents+the+building+block+of+a+DNA+molecule+which+is+a+type&rlz=1CATPIA_enUS942&sxsrf=ALeKk02q0TrtMmY64OTcRfnI6UtHtyfVwg:1614616724451&source=lnms&tbm=isch&sa=X&ved=2ahUKEwi2l7yCxI_vAhVjg-AKHXaSCVcQ_AUoAXoECBIQAw&biw=1517&bih=726#imgrc=YTAoiVTgM8UvnM
Answer:
we need to see the diagram
Explanation:
A 200 g block of a substance requires 520 J of heat to raise its temperature from 25°C to 45°C.
Use the table to identify the substance.
The answer is gold.
Explanation:Substance: Specific Heat (C) in joules per gram/degrees centigrade:
Water (ice) 2.05
Iron 0.46
Aluminium 0.90
Gold 0.13
Copper 0.39
Ammonia (liquid) 4.70
Ethanol 2.44
Gasoline 2.22
Water (liquid) 4.18
Water (vapor) 2.08
Air (25 degrees Celsius) 1.01
Oxygen 0.92
Hydrogen 14.30
To know that we clear the equation q=m*C*Δt for the specific heat (C) and solve the equation. Keep in mind that we need to use the heat (520 J) in Joules since the values from the question and the table are in Joules.
q/m∗ΔT = C = 520J/200g∗(45degC−25degC) =
0.13J/gdegC
As you can see, the substance that has this specific heat is GOLD.
The value of specific heat for the given data in the question will be for gold:-
[tex]C= 0.13\ \dfrac{J}{g^oC}[/tex]
What will be the Specific heat of the material?Specific heat can be defined as the amount of heat one kg or gram substance can absorb or release for a unit temperature difference.
The formula for the heat will be:-
[tex]Q=mc\Delta T[/tex]
m= Mass of substance
c= specific heat of the substance
[tex]\Delta T[/tex]= Temperature difference
Now the given data is
m= 200 g
Q= 520 J
[tex]\Delta T[/tex]= (45-25)=20
[tex]Q=mc\Delta T[/tex]
[tex]520=200\times C\times 20[/tex]
[tex]C= \dfrac{520}{200\times 20} =\dfrac{520}{4000} =0.13\ \dfrac{J}{g ^oC}[/tex]
Since the value of specific gold is [tex]0.13\ \dfrac{J}{g ^oC}[/tex]
Thus the value of specific heat for the given data in the question will be for gold:-
[tex]C= 0.13\ \dfrac{J}{g^oC}[/tex]
To know more about Specific Heat follow
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What volume do 78 grams of magnesium occupy?
Identify the reaction
In photo
Answer:
single displacement
Explanation:
The diagrams P, Q and R show the atoms in a compound, an element and a mixture,
but not necessarily in that order.Which row of the table correctly identifies P, Q and R?
look at the photo
Answer:
C.
Explanation:
A mixture contains two or more substances.
A compound contains elements in a fixed ratio.
P = Element
Q = Compound
R = Mixture
The correct order is C.
an object that is moving will stop when
Answer:
factor
Explanation:
Answer:
something pushes or pulls it to a stop.
What are some goals for science class virtual learning
Answer:
It wouldn't let me post it for some reason. Its all in the picture.
Really hope it helps!!:)
PLS ANSWER THIS FOR ME ILL GIVE BRAINLIEST
ok so pls watch episode 18 (Eureka Videos is the channel) and then answer all these
When molecules evaporate they are gaining enough _______ to break the forces of __________ holding them together. This might be compared to the popping of popcorn.
Why can't we see the vapour molecules that have escaped?.
How does increasing the heat affect the rate of molecules popping out into the vapour state?
The colder molecules get, the _________ they move
In the lewis structure for a molecule of ammonia (NH3), how many lone pairs of electrons does nitrogen have? PLEASE HELP
d) 0.
5 out of 8 would be paired already because it has 5 electrons, then the other 3 would be filled by the 3 hydrogens.
Antarctica is a frozen land so cold and I see no changes in Wheeler scientist have discovered fossils
Answer:
The correct answer is - due to the movement of plates it is relocated.
Explanation:
Antarctica is a very cold part of the earth, it is so cold that there is no growth of trees or such vegetation. Even though there are no or less vegetation scientists found fossils of the trees.
It is relocated from the north where the conditions were warmer and easy for tree growth. It is then moved due to plate movements to the south pole. This is the reason behind the fossils scientist found.
Calculate the pH of a 0.002M acetic acid solution if it is 2.3% ionised at this dilution, ka=1.8×10^-5.
Answer:
3.11 is the pH of the solution
Explanation:
The ionised form of the acetic acid is the acetate ion. To solve this problem we need to solve H-H equation:
pH = pKa + log [A⁻] / [HA]
Where pH is the pH of the buffer
pKa = -log Ka = 4.74
[A⁻] = Concentration of acetate ion = 0.002M * 2.3% = 4.6x10⁻⁵M
[HA] = Concentration of acetic acid = 0.002M *(100-2.3)% = 0.001954M
Replacing:
pH = 4.74 + log [4.6x10⁻⁵M] / [0.001954M]
pH = 3.11 is the pH of the solution
The outpost structure of the bacteria cell is the.
Explain why laboratory safety rules are important.
it's for a essay please help!!!!!!
Answer:
Laboratory safety rules are important because there can be many dangerous chemicals in a lab. Safety rules help people stay safe when they are in close contact with these chemicals. Over the past few years, lab safety rules have prevented many deaths. It's important to follow these rules because you could get seriously injured if you don't.
Hope that helps! Good luck! :)
state the kinetic theory of matter
Answer:
The kinetic theory of matter (particle theory) says that all matter consists of many, very small particles which are constantly moving or in a continual state of motion.
Which element is in the same group as carbon?
look at the attached photo
Answer:
B. Germanium
Explanation:
Since the carbon group element consists of carbon, germanium, etc. Germanium is in the same group as carbon.
Metion two common types of flames and conditions under which each is produced
Answer:
natural flame,oxidising flame
explain what keeps the electrons confined in the space surrounding the nuleus
Answer:
Electrons are trapped inside the atom because of the attraction forces with positively charged protons that are found in the nucleus.
What type of music do people like
Answer:
pop, emotional, heart touching, freestyle and rap music is what I LOVE!!!!!
when a substance like sugar dissolves in water, the particles intermingle. This is possible because the particles of sugar
a)have spaces between them
b)have strong attractions to eachother
c)are pure
d)are vaporized
Answer:
A
Explanation:
What causes rocks to change and form into new types of rocks?
Answer:
The three main rock types are igneous, metamorphic and sedimentary. The three processes that change one rock to another are crystallization, metamorphism, and erosion and sedimentation. Any rock can transform into any other rock by passing through one or more of these processes. This creates the rock cycle.
what are the good and bad effects of bacteria
Answer:
they are bacteria
Explanation:
Answer:
Good bacteria keeps you healthy by supporting your immune function and controlling inflammation. Certain types of good bacteria can also: Help your body digest food. Keep bad bacteria from getting out of control and making you sick.
Explanation:
I hope this helps and pls mark me brainliest :)
Which of Earth's five spheres is involved when a volcano erupts?
Answer:
[;
Explanation:
Mudflows (geosphere) and flooding may occur downstream from volcanoes and may inundate streamside communities (biosphere).
5. How many grams of Al2O3 are dissolved in 852 g of water in a 0.329 m solution of Al2O3?
Answer:
Al2o3 grams to moles
Explanation:
You can view more details on each measurement unit: molecular weight of Al2O3 or grams This compound is also known as Aluminium Oxide. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Al2O3, or 101.961276 grams.
1 point
7) While preparing a temporary mount of cheek cells, teacher asked Rohit
to pick up the stain. He had four bottles A, B, C and D containing Methylene
blue, glycerin, distilled water, Canada balsam respectively. Which one
should he pick? *
А
B
C
D