Answer:she did not do it in the correct order
Explanation:
Lisa violated several lab safety rules. Here are the specific safety protocols that Lisa failed to follow:
1. Wearing a lab coat: Lisa was not wearing a lab coat, which is essential personal protective equipment (PPE) in a laboratory setting. Lab coats protect the skin and clothing from spills and splashes of hazardous substances.
2. Wearing gloves: Lisa did not have gloves on when handling the chemical. Gloves are necessary to prevent skin contact with chemicals, which could cause irritation, burns, or be absorbed through the skin.
3. Wearing safety goggles: Lisa was not wearing safety goggles. Eye protection is crucial to prevent injury from chemical splashes, vapors, or flying objects.
4. Proper disposal of broken glassware: Lisa placed the broken glassware in the regular trash bin. Broken glassware should be disposed of in a designated sharps container to prevent injury to others who may come into contact with the trash.
5. Proper storage of chemicals: Lisa returned the bottle of acetone to the wrong shelf. Chemicals should always be stored in their correct, designated locations to prevent incompatibility reactions (e.g., mixing of acids and bases, oxidizers and flammables) that could lead to fires, explosions, or the release of toxic fumes.
6. Leaving the fume hood open: Lisa left the sash of the fume hood open. The sash should be closed to the proper working level to contain and exhaust fumes and vapors from the laboratory.
7. Using a spatula to transfer chemicals: Lisa used a metal spatula to transfer a solid chemical. Depending on the reactivity of the chemical, a metal spatula could introduce contamination or react with the chemical. It is important to use the appropriate tool for the task, often a plastic or ceramic spatula for corrosive substances.
8. Ignoring the chemical's label: Lisa did not read the label on the chemical bottle before use. It is essential to read and understand the labels and safety data sheets (SDS) for all chemicals to be aware of their properties, hazards, and handling procedures.
9. Not using a pipette bulb or pipette filler: Lisa used her mouth to pipette the solution, which is extremely dangerous. Using the mouth to pipette can lead to ingestion or inhalation of hazardous chemicals. Instead, a pipette bulb or a mechanical pipette filler should be used.
10. Not securing her hair: Lisa's hair was not tied back or covered, which can be a hazard near open flames or when working with volatile chemicals. Hair should be secured to prevent it from catching fire or coming into contact with hazardous materials.
In summary, Lisa's actions in the lab were not in compliance with standard laboratory safety practices, which are designed to protect her and others from potential harm. It is critical for anyone working in a laboratory to adhere strictly to safety guidelines to minimize the risk of accidents and exposure to hazardous materials."
When she dropped a rock into a graduated cylinder of water, Veronica noticed it sank to the bottom. She decided to investigate what it would do if she tossed it into a much larger amount of water. When she tossed it into a lake, the rock sank again. Which statement best explained why this happened?
Answer:
The density of a substance is the same regardless of the amount.
Explanation:
How many moles of TNT would be detonated if you used 539.88 grams of TNT? The structure of TNT is C7H5N3O6. Round your answer to two decimal places.
Answer:
Moles of TNT = 2.38 moles
Explanation:
First , calculate the molar mass of the compound TNT
The formula is : C7H5N3O6
How to calculate molar mass?
Molar mass : It is the mass of substance in grams which is present in 1 mole of the compound.It is calculated by:
Molar mass = Number of atoms x the atomic mass of the element
Atomic mass of the elements are given below :
C = 12.0107
H = 1.0079
N = 14.0067
O = 15.9994
Molar mass of C7H5N3O6 =
= (7 x C) + (5 x H) + (3 x N) + (6 x O)
= 7(12.0107) +5(1.0079) + 3(14.0067) + 6(15.9994)
Molar mass = 227 .13 gram/mole
Mole are calculated using the formula:
[tex]Moles =\frac{given\ mass}{Molar\ mass}[/tex]
Given mass = 539.88 grams
Molar mass = 227.13 g/mole
[tex]Moles =\frac{539.88}{227.13}[/tex]
= 2.3769
Moles = 2.38 moles
The number of moles of TNT in 539.88 g is 2.38. This is found by dividing the mass of TNT by its molar mass.
Explanation:To solve this problem, we need to first calculate the molar mass of TNT (C7H5N3O6). The molar masses of Carbon (C), Hydrogen (H), Nitrogen (N), and Oxygen (O) are roughly 12.01 g/mol, 1.01 g/mol, 14.01 g/mol, and 16.00 g/mol respectively. Thus, the molar mass of TNT is:
(7*12.01 g/mol) + (5*1.01 g/mol) + (3*14.01 g/mol) + (6*16.00 g/mol) = 227.13 g/mol
Then, use the formula to calculate the moles:
moles of TNT = mass(g) / molar mass(g/mol)
Substitute the values:
moles of TNT = 539.88g / 227.13 g/mol = 2.38 mol
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Solve the following equation (y = 1.2345x – 0.6789) for x, given that y = 0.570
Answer:
x = 1.01166
General Formulas and Concepts:
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightEquality Properties
Multiplication Property of Equality Division Property of Equality Addition Property of Equality Subtraction Property of EqualityExplanation:
Step 1: Define
y = 1.2345x - 0.6789
y = 0.570
Step 2: Solve for x
Substitute in y: 0.570 = 1.2345x - 0.6789[Addition Property of Equality] Add 0.6789 on both sides: 1.2489 = 1.2345x[Division Property of Equality] Divide 1.2345 on both sides: 1.01166 = xRewrite/Rearrange: x = 1.01166Final answer:
To solve the given linear equation for x, add 0.6789 to both sides, divide by 1.2345, and then substitute y = 0.570 to find the value of x as 1.012 .
Explanation:
To solve the equation y = 1.2345x - 0.6789 for x, given that y = 0.570, we will isolate x on one side of the equation. First, we add 0.6789 to both sides to get y + 0.6789 = 1.2345x. Then, we divide both sides by 1.2345 to find x:
x = (y + 0.6789) / 1.2345
Substituting 0.570 for y, we get:
x = (0.570 + 0.6789) / 1.2345
x= 1.012
After performing the calculations, we find the value of x to be 1.012 that satisfies the given equation with y equal to 0.570.
Complete the equation
CaCO3+______HCL ↠ _______________
Answer:
Explanation:
CaCO3(s) + 2 HCl(aq) --> CaCl2(aq) + CO2(g) + H2O(l)
Answer:
CaCl2 + CO2 + H2O
Explanation:
CaCO3 + 2HCl -> CaCl2 + CO2 + H2O There is one Calcium atom on the left and one Calcium atom on the right so this is balanced. There is 1 Carbon atom on the left and 1 Carbon atom on the right so this is balanced. There are 3 Oxygen atoms on the left and 3 Oxygen atoms on the right so this is balanced.
Which of the following is true about mixtures and compounds?
A.
A mixture contains different substances that are not chemically combined with one another.
OB. A compound forms when different substances chemically combine to form a new substance.
C. Mixtures and compounds are both made of two or more different substances.
D.
all of these
Answer:option D. All of these
Explanation:
In which substance do the particle move the fastest
Answer:
GAS
Explanation:
The movement of the particles is fast in increasing order of Solid< Liquid< Gas. The particles move faster in fluids which are liquids and gases. The movement of the particles of a substance depends on many factors like temperature, pressure, viscosity of the fluid, density, surface or environment in/on which its flowing.
The rise in temperature of the substance increases the kinetic energy of its particles which makes them to move faster. The increase in temperature of the solids up to a certain point melts them which allows them to flow, causing the particles to move faster than before, also on increasing the temperature of the liquids converts them to gas which makes their particles to move more rapidly and freely.
Particles move the fastest in substances with the least viscosity, meaning they have lower resistance to flow. Gaseous substances, which have weaker intermolecular forces, allow particles to move rapidly, thus, in gas particles move the fastest compared to liquids and solids.
The question asks about the movement speed of particles in different substances. In general, particles move the fastest in substances with the least resistance to flow, which indicates that these substances have the least viscosity. Conversely, particles move slowly in substances with higher resistance to flow, meaning they are more viscous. As particles move faster, there is less curvature in their trajectory. For instance, particles that move at speeds close to the speed of light, such as beta particles emitted by radioactive substances, will exhibit almost straight trajectories.
Substances with stronger intermolecular forces tend to be more viscous and have slower-moving particles, while substances with weaker intermolecular forces have faster-moving particles and lower viscosity.
Within the states of matter, solid particles are mostly rigid with only vibrations, liquid particles are more mobile, and gas particles are the most mobile, moving at high speeds and frequently colliding with each other. Therefore, in the context of states of matter, gas particles move the fastest.
what ions are released when acid is mixed with water
Answer:
carbon dioxide
Explanation:
How many squares are on 2 x 2 grid
Answer:
4
because
2*2
= 4
Essentially if each square is worth 1 unit then we can multiply to find how many square there will be in a 2 by 2 grid.
2 * 2 = 4
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In a crash test, a 2,500 kg car hits a concrete barrier at 1.3 m/s2.
Calculate the amount of force at which the car strikes the barrier.
The car strikes the barrier with a force of
N.
Answer: 3250 N
Explanation: Force can be calculated as the product of mass and acceleration:
F= ma
= 2500 kg x 1.3 m/s²
= 3250 N
Answer:
3250
Explanation:
This is a net gain or loss of electrons
Answer:loss of electrons bucause i dont think it would be the other one at all
Explanation:
If you are referring to a "net gain or loss of electrons" in the context of chemical reactions or electron transfer:
A net gain of electrons occurs when an atom, ion, or molecule receives one or more electrons during a chemical reaction. This is often associated with the reduction half-reaction in redox reactions, where a substance gains electrons and typically reduces in charge or oxidation state.
A net loss of electrons occurs when an atom, ion, or molecule loses one or more electrons during a chemical reaction. This is often associated with the oxidation half-reaction in redox reactions, where a substance loses electrons and typically oxidizes in charge or oxidation state.
In a redox reaction, one substance is oxidized (loses electrons), and another substance is reduced (gains electrons). The net gain or loss of electrons in such reactions depends on the specific substances involved.
If you are referring to a "net gain or loss of electrons" in a broader or more general sense:
A net gain of electrons implies that the total number of electrons in a system has increased, meaning that more electrons are present in the system than before.
A net loss of electrons implies that the total number of electrons in a system has decreased, meaning that fewer electrons are present in the system than before.
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A balloon contains 1.00 mol helium gas at STP. What will the volume of the balloon be if the pressure increases to 2.00 atm? 11.2
A syringe contains 0.10 mol neon gas at STP. What volume does the syringe indicate? 2.24
A chemist adds 0.10 mol argon gas to the syringe. The pressure and temperature remain constant. What will be the volume on the syringe after the argon is added? 4.48 L
The volume of the helium gas will be 11.2L when the pressure increases to 2.00 atm and the volume of the neon gas syringe will be 2.24L at STP. After adding 0.10 mol of argon gas to the syringe, keeping pressure and temperature constant, the volume will increase to 4.48 L.
Explanation:The student is asking about the behavior of gases under different conditions and these questions deal with the application of the ideal gas law. The ideal gas law formula is PV=nRT, where P is pressure, V is volume, n is number of moles, R is gas constant, and T is temperature. We can utilize this formula to solve each of these problems.
1.00 mol helium gas at STP in a balloon: At STP (standard temperature and pressure), 1 mole of any gas occupies 22.4 L. So, if the pressure doubles to 2.00 atm, the volume will reduce to half(by Boyle's Law (P1V1=P2V2)) which is 11.2L.
0.10 mol neon gas at STP in a syringe: At STP, 0.10 mol of gas will occupy a volume of 0.10 mol x 22.4 L/mol = 2.24 L.
Adding 0.10 mol argon gas to the syringe: After adding the argon, the total amount of moles of gas is 0.10 mol neon + 0.10 mol argon = 0.20 mol. At STP, 0.20 mol gas will occupy a volume of 0.20 mol x 22.4 L/mol = 4.48 L. So, the syringe will indicate 4.48 L after the argon is added and the pressure and temperature remain constant.
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How many atoms are found in 3.45 g of CO2?
To find the number of atoms in 3.45 g of CO2, we use the concept of moles and Avogadro's number. The number of atoms is approximately 4.71 x 10^22 atoms.
Explanation:To determine the number of atoms in 3.45 g of CO2, we need to use the concept of moles. Firstly, we need to find the molar mass of CO2, which is approximately 44 g/mol. Next, we can use the formula:
No. of moles = mass / molar mass
Substituting the given values, we get:
No. of moles = 3.45 g / 44 g/mol ≈ 0.078 mol
Finally, we can use Avogadro's number, which states that 1 mole of any substance contains 6.022 x 10^23 particles (atoms or molecules):
No. of atoms = No. of moles x Avogadro's number ≈ 0.078 mol x 6.022 x 10^23 atoms/mol ≈ 4.71 x 10^22 atoms
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3. A Covalent bonds form between atoms
of which type of elements?
Answer:
Atoms with high electro negativity
Answer: Nonmetallic elements
Explanation: Covalent bonding happens on two nonmetallic elements in which they exhibit sharing of valence electrons to become octet or stabe
How many moles of potassium bromide are in 68.5 mL of a 1.65 M solution?
Answer is 0.11
Answer:
Number of moles = 0.116 mol
Explanation:
Given data:
Number of moles of potassium bromide = ?
Volume of solution = 68.5 mL
Molarity of solution = 1.65 M
Solution:
First of all we will convert the mL into L.
68.5 mL × 1 L /1000 mL
0.07 L
Molarity = Number of moles / Volume in litter
we will rearrange the formula:
Number of moles = molarity × volume in litter
Now we will put the values in formula:
Number of moles = 1.65 M ×0.07 L
Number of moles = 0.116 mol
Answer: 0.11
Explanation:
Which property is characterized by the ability to bend?
malleable
lustrous
opaque
conductive
Answer:
Malleable
Explanation:
where would you expect to find a storm
Answer:
There's probably going to have some signs that might lead to the storm.
Explanation:
How many liters of gas are contained in 0.987 mols of Krypton?
Answer:
22.11 L
Explanation:
Data Given:
no. of moles of Krypton = 0.987
Liters of Krypton gas (volume) = ?
Solution:
we will volume of gas
Formula used
no. of moles = Volume of gas / Molar volume
Rearrange the above equation to find volume
Volume of gas = no. of moles x Molar Volume . . . . . . (1)
Where
Molar volume = 22.4 L /mol
Put values in above equation 1
Volume of gas = 0.987 mols x 22.4 L /mol
Volume of gas = 22.11 L
So,
Volume of Krypton gas = 22.11 L
A sample of gas takes up 2.35L of space at room temperature (20.0C) What volume will the gas occupy at -5.00C? (Don’t forget time convert to kelvin’s)
Answer:the volume will be 2.15L
Explanation:
V1 = 2.35L
V2 =?
T1 = 20°C = 20 +273 = 293k
T2 = - 5°C = - 5 + 273 = 268k
V1 /T1 = V2 /T2
2.35 /293 = V2 /268
V2 = (2.35 / 293) x 268
V2 = 2.15L
when NaOH(aq) and MgCl2(aq) are mixed, and NaCl(aq) are produced. write the balanced molecular, total ionic and net ionic equations
The balanced molecular reaction is just made of the species as they appear in the chemical equation, with coefficient on the front so we can have the same number of atoms for each elements at the left and the right of the arrow:
2NaOH(aq) + MgCl₂(aq) → Mg(OH)₂(s) + 2NaCl(aq)
The total ionic equation is made by dissociating the ions of the aqueous species:
2Na⁺ + 2OH⁻ + Mg²⁺ + 2Cl⁻ → Mg(OH)₂(s) + 2Na⁺ + 2Cl⁻
The net ionic equation is made by cancelling out the ions that are found at the right and the left of the arrow:
Mg²⁺ + 2OH⁻ → Mg(OH)₂(s)
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the daily value for phosphorus is a 700 mg how many grams of phosphorus are recommended
The amount of grams of phosphorus that are recommended is 0.700 g
Why?
This is an unit conversion problem. To convert between units we use conversion factors. In this case the conversion factor we want is from mg to g, and this is relatively simple: 1000 mg = 1 g. Now, we arrange the quantities in the following way:
[tex]700 mg P*\frac{1g}{1000mg}=0.700 g[/tex]
Conversion factors are really useful for converting units! Just remember to put the unit you don't want at the bottom, and the one you want at the top.
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Answer:
0.700mg
Explanation:
Elemental Phosphorus is probably different than supplement phosphorus. We cannot ingest red, yellow, or white phosphorus.
So 700mg of something is technically .7grams of that something, but supplemental phosphorus would weigh a bit more per volume of supplement because it would contain other atoms besides just phosphorus, to allow it to become BIOAVAILABLE. So depending on the molecular makeup of that edible phosphorus it may weigh 2grams per .7gram of pure phosphorus, or it could weigh 1.4grams or .9grams…. anything over that original .7grams
700mg of phosphorus is .7grams pure, but you will consume more than .7grams to get it in your system.
plzzzz HELPPPP!!!!!!!
Explanation:
one molecule of H2 I think
Explanation:
Seems to me like you have 8H and 2N. You need 3H for every N so 6H total. 8H-6H=2H which is one molecule of H2.
how many moles of ammonium nitrate will be produced 110.0g of ammonium carbonate
Answer:
2.288 Moles of NH₄NO₃
Explanation:
The Balance chemical equation is as follow:
(NH₄)₂CO₃ + 2 HNO₃ → 2 NH₄NO₃ + H₂O + CO₂
To solve this problem we will do following steps:
Finding moles of Ammonium Carbonate:
As we know,
Moles = Mass / M.Mass
So,
Moles = 110 g / 96.08 g/mol
Moles = 1.144 moles
Calculating moles of Ammonium Nitrate:
According to balance chemical equation;
1 mole of (NH₄)₂CO₃ produces = 2 moles of NH₄NO₃
So,
1.144 moles of (NH₄)₂CO₃ will produce = X moles of NH₄NO₃
Solving for X,
X = 2 moles × 1.144 moles ÷ 1 mole
X = 2.288 moles of NH₄NO₃
A puppy weight 7\18 pound and a kitten weight 4\9 pound Which weight more Explain
Answer:
the kitten
Explanation:
4/9 x 2/2 = 8/18
8/ 18 is greater than 7/18
What is diffusion?
A. The mixing of gas molecules due to random motion
B. The force created when gas molecules hit their container
C. The total number of molecules within a volume of gas
D. The space occupied by gas molecules moving around
Answer: The mixing of gas molecules due to random motion (a)
Explanation:
The molecules and the particles of the substances move due to diffusion. It involves the mixing of gas molecules due to random motion. Thus, option A is correct.
What is diffusion?Diffusion is the process of spreading and mixing the particles of the matter from a region of high to lower concentration. The process of diffusion depends on pressure and concentration.
The molecule passes from a higher region of concentration by passing a membrane to a region that has a lower region of the gaseous particles.
The concentration gradient plays an important role in the diffusion and is a random movement that allows the net flow of the particles based on the concentration of the solute.
Therefore, option A. the mixing of molecules due to random motion is diffusion.
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How many electrons does a Copper atom have?
Answer:
27 electrons
Explanation:
A copper ion with a charge of +2 has 29 protons and 27 electrons. The atomic number of an element is equal to the number of protons in the nucleus of each atom of that element.
Answer:
A Carbon atom has 29 electrons
Explanation: The number of protons of any given element is equal to the number of electrons. In this case there are 29 protons in the Carbon atom, so in return there are 29 electrons.
In parallelogram LMNO, what is the measure of angle M?
Answer:
60
Explanation:
60
The health codes cover all issues, except:
Workers health & safety
Exporting foods
Importing foods
Food service complaints
Answer: The health code covers all issues except Exporting foods
Explanation: Health codes are a set of standards established and enforced by government for health requirements. It is a model for safeguarding public health and ensuring food is unadulterated and honestly presented when offered to the consumer.
Food and Drug Administration is the regulatory body in charge in the USA and their jurisdiction is only limited within the country.
The Code establishes definitions; sets standards for management and personnel, food operations, and equipment and facilities; and provides for food establishment plan review, permit issuance, inspection, employee restriction, and permit suspension.
Health codes address a plethora of public health issues, including measures for workers' health and safety, regulations for importing and exporting foods, and how to handle food service complaints.
Explanation:Health codes cover a vast range of issues and regulations that relate to the health and safety of the public. This includes workers' health and safety, importing and exporting foods, and food service complaints. These codes aim to uphold hygiene, safety, and good practice in the food service industry, which includes ensuring safe practices are being followed by staff members (workers' health & safety), the quality and integrity of foods being exported/imported, as well as addressing customer complaints regarding the service of food.
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The maximum power of a small utility vehicle is 10,000 watts. At maximum power, how much time would it take for the vehicle to pull a 500 N rock 100 meters?
Answer:
The time taken for the vehicle to pull a 500 N rock 100 meters is :
t = 5 sec
Explanation:
Work = The magnitude of work is given by the product of force and displacement .
W = F x s
F = Force in Newton"N"
s = displacement "s"
In the question : F = 500 N and s = 100 m
W = F x s
W = 500 x 100
W = 50000 Nm
W = 50000 J
Power : It is the rate of doing work.The expression of power is given by :
[tex]Power=\frac{Work}{time}[/tex]
[tex]P = \frac{W}{t}[/tex]
W = Work = 50000 J
t = time
P = power = 10,000 Watt
Put the value in the formula:
[tex]P = \frac{W}{t}[/tex]
[tex]t = \frac{W}{P}[/tex]
[tex]t = \frac{50000}{10,000}[/tex]
t = 5 sec
Why is sodium chloride not a mixture?
Why is sodium chloride a compound?
Answer:Sodium chloride solid is not a mixture. ... It cannot be physically separated into its components, Na+ and Cl−
Explanation:Sodium chloride is formed when sodium atoms interact with chlorine atoms. When this occurs, sodium will donate an electron (which is a negatively-charged particle) to chlorine. This makes sodium slightly positive and chlorine slightly negative.
Opposite charges attract, right? So then, sodium ions will attract chloride ions and form an ionic bond. By the way, chloride is the term used to designate the anion form of chlorine. The result is a crystallized salt that has properties that are different from the two parent elements (sodium and chlorine). The chemical formula for sodium chloride is NaCl, which means that for every sodium atom present, there is exactly one chloride atom.
Sodium chloride is a compound rather than a mixture because it consists of sodium and chlorine bonded together in a fixed ratio, forming a substance with unique properties different from those of the individual elements.
Sodium chloride (NaCl) is not a mixture but a compound because it is formed by a chemical reaction between the metal sodium and the nonmetal chlorine. In compounds, the components combine in a fixed ratio, exhibiting properties entirely different from the individual elements.
The formation of ionic compounds like sodium chloride involves the transfer of electrons from the metal to the nonmetal, resulting in a compound with a crystal lattice structure, Sodium chloride is composed of sodium cations and chloride anions, and the strong ionic bonds in its structure require significant energy to break, which is not the case with mixtures.
Mixtures, unlike compounds, can vary in composition and the components maintain their own properties. In mixtures, substances like elements or compounds are just physically intermingled without chemical bonding, such as salt dissolved in water.
In contrast, every sample of sodium chloride has a uniform and definite composition and all are chemically identical, as sodium and chlorine react in a 1:1 ratio to form this vital ingredient of all animal diets.
what’s the formula for copper (I) phosphate
Answer: Cu3PO4
Explanation: Copper has an oxidation of Cu+1 and Phosphate a polyatomic ion is PO4 -3
Do the criss cross rule on their charges as the charge of Copper will be the subscript pf PO4 and vice versa.