Answer:
Use appropriate cut-resistant gloves to handle broken glass. Use forceps, tongs, scoops, or other mechanical devices for removing or retrieving broken glass from the work area or a fume hood. A dustpan and brush should be used to clean up shards/small pieces of broken glass, Pasteur pipettes, or shards of glass.
Explanation:
Answer:
Step away from the mess and have a teacher/gaurdian access the situation.
What is the difference between weight and mass?
Weight depends on density and mass depends on gravity.
Mass depends on gravity and weight depends on volume
O Weight depends on gravity and mass is constant.
Both weight and mass are constant
Key differences between Mass and Weight
The weight may vary, but the mass is constant.
The mass is measured in kilograms (kg), while the weight is measured in newtons (N).
Mass refers to the amount of matter an object has, but the weight refers to the force of gravity acting on an object.
Answer:
C. Academic English
Explanation:
just a side note, it'd be alot easier if you put the answers like this:
A. Urban English
B. Standard English, and et
Explanation:
Fe₂O3 + 2Al →Al₂O3 + 2Fe
How many grams of aluminum oxide are produced
in the reaction?
Given balanced equation:
Fe₂O₃ + 2Al → Al₂O₃ + 2Fe
Molar masses:
Fe₂O₃: 159.69 g/mol
Al: 26.98 g/mol
Al₂O₃: 101.96 g/mol
The equation tells us that 1 mole of Fe₂O₃ reacts with 2 moles of Al to produce 1 mole of Al₂O₃.
Step 1: Calculate the number of moles of Al₂O₃ produced:
Using the mole ratio from the balanced equation, we find that the number of moles of Al₂O₃ is equal to the number of moles of Fe₂O₃ used.
So, the moles of Al₂O₃ produced = moles of Fe₂O₃ used = 1 mole.
Step 2: Convert moles to grams:
To convert moles of Al₂O₃ to grams, we multiply by the molar mass of Al₂O₃.
Grams of Al₂O₃ produced = moles of Al₂O₃ produced × molar mass of Al₂O₃
Grams of Al₂O₃ produced = 1 mole × 101.96 g/mol
Grams of Al₂O₃ produced = 101.96 grams
Therefore, 101.96 grams of aluminum oxide (Al₂O₃) are produced in the reaction.
What is the volume of a cube with dimensions 11.0 cm × 11.0 cm × 11.0 cm in m3?
Answer:
1.33 × 10⁻³ m³
Explanation:
Step 1: Given data
Side of the cube (d): 11.0 cm
Step 2: Calculate the volume of the cube (V)
We will use the following expression.
V = d³
V = (11.0 cm)³
V = 1.33 × 10³ cm³
Step 3: Convert "V" to m³
We will use the conversion factor 1 m³ = 10⁶ cm³.
1.33 × 10³ cm³ × (1 m³ / 10⁶ cm³) = 1.33 × 10⁻³ m³
How can scientific theories be changed ?
Which of the following is an ionic compound?
Select one: a. H2S b. NH3 c. I2 d. KI e. CCl4
Answer:
D
Explanation:
H2S is covalent
NH3 is covalent
I2 is covalent
KI is ionic
CCl4 is covalent
5.
The apparatus below was used to make carbon dioxide. Dilute hydrochloric acid was added
to calcium carbonate.
A
0
O
B
о
water
con
calcium carbonate
(a) Identify the pieces of apparatus labelled:
A.....
B. conical Flask
Which of the following is most likely a homogeneous mixture?
A. Chunky peanut butter
B. A vanilla milkshake
C.chocolate chip cookies
D. A tossed vegetable salad
Answer:
a vanilla milkshake
Explanation:
a homogeneous mixture is a mixture that is equal in all parts. a tossed salad may have some parts with more lettuce. a chocolate chip cookie might have more chocolate chips in one area. and chunky peanut butter is really chunky.
hope this helps<3
What masses of sodium chloride, magnesium chloride, sodium sulfate, calcium chloride, potassium chloride, and sodium bicarbonate are needed to produce 1 L of artificial seawater for an aquarium? The required ionic concentrations are [Na+] = 3.28 M; [K+] = 0.0094 M; [Mg2+] = 0.0693 M; [Ca2+] = 0.0115 M; [HCO3−] = 0.0015 M; [Cl−] = 3.32 M; [SO42−] = 0.0652 M.
Answer:
NaCl: 184g
MgCl₂: 6.60g
Na₂SO₄: 9.26g
CaCl₂: 1.28g
KCl: 0.70g
NaHCO₃: 0.13g
Explanation:
To convert these concentrations to masses we need to convert molarity to moles and moles to grams using molar mass of each salt:
[CaCl₂] = [Ca²⁺] = 0.0115M
[HCO₃⁻] = [NaHCO₃] = 0.0015M
[SO₄²⁻] = [Na₂SO₄] = 0.0652M
[Mg²⁺] = [MgCl₂] = 0.0693M
[K⁺] = [KCl] = 0.0094M
And using the concentration of Cl⁻:
[Cl⁻] = [NaCl] + 2[MgCl₂] + 2[CaCl₂] + [KCl]
[3.32] = [NaCl] + 2[0.0693] + 2[0.0115] + [0.0094]
[NaCl] = 3.149M
The masses you need are:
NaCl (Molar mass: 58.44g/mol):
3.149mol/L * 1L * (58.44g/mol) =
184g NaClMgCl₂ (Molar mass: 95.211g/mol):
0.0693mol/L * 1L * (95.211g/mol) =
6.60g MgCl₂Na₂SO₄ (Molar mass: 142.04g/mol):
0.0652mol/L * 1L * (142.04g/mol) =
9.26g Na₂SO₄CaCl₂ (Molar mass: 110.98g/mol):
0.0115mol/L * 1L * (110.98g/mol) =
1.28g CaCl₂KCl (Molar mass: 74.55g/mol):
0.0094mol/L * 1L * (74.55g/mol) =
0.70g KClNaHCO₃ (Molar mass: 84g/mol):
0.0015mol/L * 1L * (84g/mol) =
0.13g NaHCO₃Name the three particles that make up an alom and describe the charge oleach atomo
particle
Answer:
Protons, neutrons, and electrons
Explanation:
protons- a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
neutrons- a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
electrons- a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
Tell me if u can and i wamt a Real answer
Answer:
a) Does not describe an element
b) Not possible to tell
c) Describes an element
d) Does not describe an element
e) Describes an element
f) Describes an element
Explanation:
I need helppppo it’s timeddddddddd
Ni2+(aq) + SO42–(aq) + 2Na+(aq) + S2–(aq) NiS(s) + 2Na+(aq) + SO42–(aq) net ionic equation ?
To get the net Ionic equation we must get rid of spectator ions, I.E. the ions that repeat on either side of the equation.
So...!
[tex]Ni_{2}[/tex][tex](aq)^{+}[/tex] + [tex]SO_{4}(aq)^2-[/tex] + [tex]2Na(aq)^+[/tex] + [tex]S_{2} (aq)^{2} -[/tex] → [tex]2NiS(s)[/tex] + [tex]2Na(aq)^{+}[/tex] + [tex]SO_{4}(aq)^{2-}[/tex]
This becomes the following net ionic.
[tex]Ni_{2}[/tex][tex](aq)^{+}[/tex] + [tex]S_{2} (aq)^{2} -[/tex] → [tex]2NiS(s)[/tex]
Baseballs pitched by a machine have a horizontal velocity of 30 meters/second. The machine accelerates the baseball from 0 meters/second to 30 meters/second in 0.5 seconds. If a baseball has a mass of 0.15 kilograms, the force the machine exerts is newtons. Use F = ma, where a = v − u t .
The machine exerts a force of 9 newtons on the baseball to accelerate it from 0 m/s to 30 m/s in 0.5 seconds.
To calculate the force exerted by the machine on the baseball, we can use Newton's second law of motion, which states that force (F) is equal to the product of mass (m) and acceleration (a).
In this case, the acceleration can be determined using the formula a = (v - u) / t, where v is the final velocity, u is the initial velocity, and t is the time taken for the acceleration.
Given:
Mass of the baseball (m) = 0.15 kg
Initial velocity (u) = 0 m/s (as the baseball starts from rest)
Final velocity (v) = 30 m/s
Time (t) = 0.5 s
First, let's calculate the acceleration:
a = (v - u) / t
a = (30 m/s - 0 m/s) / 0.5 s
a = 60 m/s^2
Now, we can use the calculated acceleration and the given mass to determine the force:
F = m * a
F = 0.15 kg * 60 m/s^2
F = 9 N
The machine exerts a force of 9 newtons on the baseball. This force is calculated using Newton's second law of motion, which states that force is equal to mass multiplied by acceleration.
By determining the acceleration of the baseball using the formula a = (v - u) / t and substituting the given values, we find that the acceleration is 60 m/s^2. Multiplying the mass of the baseball (0.15 kg) by the acceleration gives the force exerted by the machine as 9 newtons.
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The mass number of a fluorine (F) atom is 19 . How many neutrons does it have
pH is defined as the negative log10 of the hydrogen ion activity, aH+, although general chemistry texts commonly express it in terms of the hydronium ion concentration. Thus, pH = −log10 [H3O+], where [H3O+] represents the concentration of H3O+ in units of moles per liter (M). Calculate the pH or [H3O+], as required, for the following solutions.
{H3O+}= 5.79 X 10^-4M
Answer:
The pH value is 3.23
Explanation:
Given that,
[tex][H_{3}O^{+}]=5.79\times10^{-4}\ M[/tex]
We know that,
pH is defined as the negative log10 of the hydrogen ion activity,
We need to calculate the pH
Using formula of pH
[tex]pH=-log_{10}[H_{3}O^{+}][/tex]
Put the value of [tex][H_{3}O^{+}][/tex]
[tex]pH=-log_{10}(5.79\times10^{-4})[/tex]
[tex]pH=3.23[/tex]
Hence, The pH value is 3.23
The curved movement of air or water is the result of which action?
the friction that slows down winds near Earth’s surface
the rotation of Earth on its axis
the different air movements north and south of the equator
winds spinning off the equator
Answer: the rotation of Earth on its axis
Explanation: I just did the quiz in my schoolwork right now and got it right so it is correct!
Have a wonderful day!
Answer:
the rotation of earth on its axis
Explanation:
ya gurl took da test
Which reaction will proceed faster? Why?
H
HBr
+ H2O
Br
H
NaBr
+ NaOH
Br
II
Answer:
H2O i think.................................
4. What is the difference between an open system and a
closed system?
Systems can exist in three ways as open systems, closed systems, and isolated systems. The main difference between open and closed system is that in an open system, matter can be exchanged with the surrounding whereas, in a closed system, matter cannot be exchanged with the surrounding.
btw why not just look it up on google? btw btw brainliest plz
When is it best to use the displacement method to determine the volume of a solid? Select all that apply.
when the solid is insoluble in liquid
when the solid has straight edges of a common shape
when the solid has an irregular shape
when the solid dissolves in the liqui
Answer:
when the solid has an irregular shape
when the solid dissolves in the liquid
Explanation:
what is rises when boilings happen?
Answer:
Temperature and Boiling
When boiling occurs, the more energetic molecules change to a gas, spread out, and form bubbles. These rise to the surface and enter the atmosphere. It requires energy to change from a liquid to a gas (see enthalpy of vaporization).
A volume of 40.0 mL of a 0.320 M HNO3 solution is titrated with 0.340 M KOH. Calculate the volume of KOH required to reach the equivalence point
Answer:
Koh of 60 and a half
Explanation:
what is the mass of one mole of bricks
Answer:
2.4 x 1027 g
Explanation:
the mass of 1 mole of brick is 2.4 x 1027 g.
All of the following statements are true except:
a. elements are made of the same of atom
b. elements can be made of atoms or molecules
c. elements and compounds are listed on the periodic table
d.elements are symbolized by letters
What is 4.07 cm x 2.3cm, rounded to the correct number of significant figures
Answer:9.361
Explanation:
BALANCE:
__ Fe2O3 ---> __FeO + O2
after balancing find:
how many moles of FeO are produced from 8 moles of Fe2O3
SHOW WORK
According to the balanced equation 4Fe2O3 -> 6FeO + O2, we find that 4 moles of Fe2O3 produce 6 moles of FeO. Using this ratio, we can calculate that 8 moles of Fe2O3 will produce 12 moles of FeO.
To balance the equation:
Fe2O3 -> FeO + O2
We need to ensure that the number of atoms of each element is equal on both sides of the equation. Here's the balanced equation:
4Fe2O3 -> 6FeO + O2
From the balanced equation, we can see that 4 moles of Fe2O3 produce 6 moles of FeO.
To find how many moles of FeO are produced from 8 moles of Fe2O3, we can set up a proportion:
4 moles Fe2O3 / 6 moles FeO = 8 moles Fe2O3 / x moles FeO
Cross-multiplying and solving for x:
4 * x = 6 * 8
x = (6 * 8) / 4
x = 12
Therefore, 8 moles of Fe2O3 will produce 12 moles of FeO.
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A certain gas consists of a mixture of two elements. The absorption spectrum of the gas is shown in the image. Which of the following could be the emission spectra of the two elements in the gas? Select all the correct answers.
Answer:
the second and fourth one
Explanation:
i just know lol
The emission spectra of the two elements in the gas is second and third one.
Emission spectra refer to the distinct patterns of light emitted by a substance when it is energized or excited. When atoms or molecules absorb energy, typically in the form of heat or light, their electrons move to higher energy levels. As these excited electrons return to their lower energy levels, they release the excess energy in the form of light. The emitted light consists of a series of discrete wavelengths or colors, which can be separated and observed as a spectrum.
Emission spectra are unique to each element or compound and can be used to identify and characterize them. They provide information about the energy transitions occurring within the atoms or molecules and can be measured using various techniques such as spectroscopy. The emitted wavelengths correspond to specific energy differences between electron energy levels, and the resulting spectrum can appear as a series of distinct lines or bands depending on the nature of the emission process.
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What should you do if your hypothesis proves false during an experiment?
A change the data to fit the hypothesis
B form a new hypothesis and plan a new experiment
C repeat the experiment until the results support the hypothesis
D change the procedure to get the
results you want
D because you can easily make mistakes but keep goin to get it right.
1. A student observed a silver, shiny, ductile metal during a lab. Which type of property did
the student observe?
A.Physical property
B.Chemical property
C.Both A and B
D.Neither A or B
Answer:
ok
Explanation:
Answer:
B
Explanation:
Sorry if wrong, brainliest if right please
2.
Which compound is ionic?
a.
CF4
b.
SO3
C.
H2S
d.
BaCl2
e.
C12H22011
D_____________________₩_
5000kg of ammonium nitrate per square kilometer of cornfield per year. how much nitric acid would be needed to make the fertilizer needed for 1km2 of cornfield orr year
[tex]NH_3+HNO_3-> NH_4NO_3[/tex]
1 mole of nitric acid produce 1 mole of ammonium nitrate.
moles in 5000 kg of ammonium nitrate :
[tex]n=\dfrac{5000\times 1000}{80}\\\\n=62500\ moles[/tex] ( molecular mass of ammonium nitrate is 80 gm/mol )
So, number of moles of nitric acid required are also 62500 moles.
Mass of 62500 moles of nitric acid :
[tex]mass = 62500\times 63 \\\\mass = 3937500\ gram\\\\mass = 393.75\ kg[/tex]
Hence, this is the required solution.
