Answer:
R we gonna say what letter if were gonna say it its A
Explanation:
SBc Its Our Lesson Today In Science
Identify the reaction
In photo
Answer:
single displacement
Explanation:
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.
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B. Fill in the blanks with the correct answer. Choose from the choices inside the box.
1. The bones that protect the delicate organs of the body.
2. It is a long flat bone at the middle of the chest and attached to the ribs,
3. They are the bones that protrude at the base of the neck.
4, This bone connects the backbone and the legs.
5. This bone protects our brain.
6. This system of the body gives structural support and shape.
7. These muscles are connected to the bones and are responsible for movements.
8. These are involuntary muscles that are not attached to the bones.
9. These muscles are moving rhythmically, contracting and relaxing alternately to generate force to
pump blood throughout the body.
10. A system of the body that supports the skeleton and responsible for body movement.
Muscular system
skeletal system
smooth muscles
cardiac muscles
Skeletal muscles
hipbone
collarbone
axial skeleton breastbone
skull
Answer:
Answer:
Asan po yung choices?
5. Name three different waves you use on a daily basis, Explain how you use them
Answer:
We use radio waves for communicating or a for television and radio. We use Heat waves to heat things. We uses heat waves everyday for heat up food in the microwave and drying clothing when using the dryer or when drying our hair with a hairdryer. Infrared light is used by electrical heaters, cookers for cooking food, and by infrared cameras which detect people in the dark.
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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.
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.
determine the kinetic energy of an 833.0 kg roller coaster car moving at a speed of 20.0 m/s
Answer:
166,600J
Explanation:
Kinetic energy (K.E), which is the energy due to motion of a body, can be calculated by using the formula;
K.E = 1/2 × m × v²
Where;
K.E = kinetic energy (joules)
m = mass of body (kg)
v = speed or velocity (m/s)
According to this question, the mass of the roller coaster is 833.0 kg while its velocity/speed is 20.0m/s.
K.E = 1/2 × 833 × 20²
K.E = 1/2 × 833 × 400
K.E = 1/2 × 333200
K.E = 166,600
Therefore, the kinetic energy of the roller coaster car is 166,600J.
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
A 5.0 balloon containing nitrogen gas is cooled from 25 degrees to 5°C. What is the final volume of the balloon?
Answer:
5.4
Explanation:
V1=5.0
T1=25+ 273=298
V2= z(unknown)
T2=5+273=278
V1/T1 =V2/T2
V2=V1T2/T1
=5*298/278
=5.4
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
is the measure of this flow? its for thermal energy transfer interactive
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.
How many atoms are in 355 mol Na?
Answer:
2.138 x 10^26 atoms Na
Explanation:
atoms Na = 355 mol Na x (6.022 x 10^23 atoms Na/1 mol Na) = 2137.81 x 10^23 atoms Na = 2.138 x 10^26 atoms Na
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.
How many atoms are in 4.25 g of Ag?
Group of answer choices
2.76 x 10^26 atoms
2.37 x 10^23 atoms
2.76 x 10^23 atoms
2.37 x 10^22 atoms
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:
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What type of music do people like
Answer:
pop, emotional, heart touching, freestyle and rap music is what I LOVE!!!!!
Similes and metaphors are poetic devices. What does this
mean?
Answer:
Both similes and metaphors are a poetic device because authors can be seen using them while writing their poem to give the reader a deeper understanding of the character and the setting. Metaphor is a figure of speech that talks about one this but refers to another. On the other hand, a simile is a figure of speech that compares two things together. Usually using the work "like" or "as".
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Will give brainliest
Answer:
12.5
1.95x10^-10
1.5
0.5
in that order
Explanation:
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:
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
What volume do 78 grams of magnesium occupy?
I need help in this problem for an assignment. Please
Answer:
1) increases
2)increases
3) Decreases
4) increases
5) increase
6) decreases
Explanation:
Let us remember that in a solid, the molecules of the substance are trapped in fixed positions hence the entropy of a solid is less than that of liquid as well as less than the entropy of a gas.
Reaction (1) and (2) deal with a change of state from solid to liquid or gas leading to increase in entropy.
In reaction (3) the aqueous reactants convert into a liquid product leading to a decreases in entropy.
Reaction (4) and (5) has to do with change of a solid to a gas as well as an increase in volume leading to an increase in temperature.
For reaction(6), a solid is formed so entropy decreases
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:
A molecule of glucose is comprised of 6 atoms of carbon, 12 atoms of hydrogen, and 6 atoms of oxygen.
According to the information given above, what is the molecular formula of glucose?
Answer:
C6H12O6 the third choice
According to the given information , the molecular formula or the chemical formula of glucose is C₆H₁₂O₆.
What is chemical formula?Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called empirical formula.
It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.
There are four types of chemical formula:
1)empirical formula
2) structural formula
3)condensed formula
4)molecular formula
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NH4NO3->N2O+2H2O How many grams of NH4NO3 are required to produce 33.0 games of N2O
Answer:
the moles of N2O are 33/(14.2 + 16) = 0,75 (mol)
NH4NO3 -----------> N2O + 2H2O
0.75 <--- 0.75
=> The moles of NH4NO3 are 0,75 mol
=> m = 0,75(14.2 + 4 + 16.3) = 60 (g)
Explanation:
Answer:
60 grams of NH4NO3
Explanation:
2222222c is right, but here's a better visualization of the answer!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
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).
3. How many grams of water will be produced from 15.0 grams of Methane? *
CH4 +2 02 → CO2 + 2H2O
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Answer:
a
Explanation: