what are the most common student injuries in the chemistry lab and how can they be prevented

Answers

Answer 1
The most common injuries in a chemistry lab is making a fire, heat burns, chemical burns, cuts and scrapes, contamination, inhalation, and spills and breaks.

1.) You can prevent making a fire by making sure you close and seal flammable materials.
2.) You can prevent heat burns by teaching the students how to properly use tongs,water baths, and other cooling equipment. 
3.) You can prevent chemical burns by treating the chemicals with caution, measure carefully, and use the approved containers.
4.) You can prevent cuts and scrapes by telling the students how to use the blades safely, and also when they are disposing broken or sharp items they should know how to wrap them up so no one else will get hurt. 
5.) You can prevent contamination by washing your hands, protect their clothing and skin with a lab coat or a lab apron, gloves and glasses, and cleaning your area where the germs of the chemicals were so no one will become.
6.) You can prevent inhalation by opening up windows, using ventilation fans, and using an equipment that measures the amount of gas emission in a room.
7.) Finally, you can prevent spills and breaks by telling the students what will happen if anything spills, and tell them to clean up.  

Related Questions

Which of the following force pairs are an example of Newton’s 3rd Law? Select all that apply. The earth pulls down on the chair./The ground pushes up on the chair. The bat hits the baseball forward./The baseball hits the bat backwards. The boy pushes rightward on the box./Friction resists the motion leftward on the box. The bee hits the windshield northward./The windshield hits the bee southward. The rope pulls the box upward./The earth pulls the box downward.

Answers

In the series of Newton's Laws of Motion, the third one is the Law of Interaction. This states that for every action there is always an equal and opposite reaction. The forces are termed as "action" and "reaction" forces. These forces have numerically equal magnitudes but opposite in direction. 

From the examples given above, those that fall to this category are: (1) The motion of the bat and the baseball as described above, and (2) the motion of the bee and the windshield. 

Answer:In the series of Newton's Laws of Motion, the third one is the Law of Interaction. This states that for every action there is always an equal and opposite reaction. The forces are termed as "action" and "reaction" forces. These forces have numerically equal magnitudes but opposite in direction. 

From the examples given above, those that fall to this category are: (1) The motion of the bat and the baseball as described above, and (2) the motion of the bee and the windshield. 

Explanation:

Why a preservative not added when preparing non aqueous drug solution?

Answers

The reason as to why preservatives are not added in preparing a non aqueous drug solution because it could cause effects that are harmful, if it has been added, it could form toxicity, in which will be harmful in the body and could cause side effects.

How many electrons are shown in iodine electron dot structure?

Answers

Iodine is in the seventh group and therefore has seven valence electrons. So it has seven dots. Because it wants to achieve a stable octet configuration (it wants eight electrons), two iodine atoms share a pair of valence electrons to form an I-I single covalent bond.
Final answer:

The electron dot structure of iodine shows seven dots surrounding the 'I' symbol. Each dot represents one valence electron in the outermost shell. This represents iodine in a neutral state, not involved in a bond.

Explanation:

The iodine atom is represented in an electron dot structure, also known as a Lewis dot structure, by the symbol 'I' surrounded by seven dots. Each dot represents one valence electron. Iodine belongs to group 17 (Halogens) in the periodic table and has 7 valence electrons in its outermost shell. The aim of the Lewis dot structure is to show the valence electrons that participate in forming bonds in compounds.

In the case of iodine, until it gains an electron to obtain a stable configuration, its Lewis dot structure will show seven valence electrons as dots around the symbol 'I'. This applies to all neutral atoms of iodine not involved in a chemical bond. When iodine forms a compound, the electron dot structure could be different, as it would show how the electrons are shared or transferred.

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Cladistics is a way to separate animals into new species. t or f

Answers

It is a method of dividing animals into groups based on shared characteristics. 
This is true. Cladistics is a way to separate animals into new species. An approach to biological classification where animals or organisms are categorized based on shared derived characteristics through tracing the characteristics of the most recent ancestor and are not present in distant ancestors.

Which statement is true about both a solid and a gas? A. They both fill a container. B. The both have defined shapes in any space. C. The atoms of both are moving. D. There is never any motion in either.        PLEASEEE HELP PLEASEEEEEEEEE

Answers

In any state of matter there is always motion in the atoms. So the answer would be C even though solids are together and gases atoms are spread out

Answer: Option (C) is the correct answer.

Explanation:

In a solid, molecules are held together by strong intermolecular forces of attraction. As a result, they are unable to move from their initial place but they can vibrate at their mean position.  

Hence, in solid substances the molecules have low kinetic energy and they have fixed shape and volume.

In gases, the molecules are held by weak Vander waal forces. Hence, they have high kinetic energy due to which they move rapidly from one place to another leading to more number of collisions.  

Hence, gases are able to expand more rapidly as compared to liquids and solids.

Thus, we can conclude that the statement atoms of both are moving, is true about both a solid and a gas.

(10 Points) It is thought that the strongest intermolecular forces between molecules of NO are

a. Covalent Bonds
b. Dipole dipole interactions
c. London Dispersion
d. hydrogen bonds
e. ionic bonds

My guess is B but can someone explain it to me please?

Answers

The answer would be D

The strongest intermolecular forces between molecules of NO are dipole-dipole interactions NO. The correct answer is option b.

Intermolecular forces are the attractive forces that exist between molecules and affect the physical properties of substances.

NO is a polar molecule due to the difference in electronegativity between nitrogen and oxygen atoms. This means that the molecule has a positive and negative end, or dipole.

Dipole-dipole interactions occur between polar molecules and are the result of the attraction between the positive end of one molecule and the negative end of another. These interactions are stronger than London dispersion forces, which occur between nonpolar molecules, because the polarity of the molecules allows for a stronger attraction.

On the other hand, NO does not have hydrogen bonding because it does not contain hydrogen atoms bonded to highly electronegative atoms like nitrogen, oxygen, or fluorine.

NO also does not have covalent, ionic, or metallic bonding because these types of bonding occur within a molecule, not between molecules.

Therefore, dipole-dipole interactions is the strongest intermolecular forces between molecules of NO. Option b is the correct answer.

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The "particles" of a gas are actually protons or electrons. true or false

Answers

False.

Hope this helps, Good luck on the assignment.

Which type of bond would most likely form between lithium and fluorine to make lithium fluoride?

Answers

The type of bond that would most likely form between lithium and fluorine to make lithium fluoride would be an ionic bond. Lithium flouride is a compound of metal and nonmetal so we would really expect that ionic bonding is present. This type of bonding is a complete transfer of the electrons between the atoms involved.

The isotope 65 29cu2+ has how many electrons and how many protons?

Answers

 27 electron and  29 protons 

29 protons and 27 electrons. Since the element is copper, that automatically means that you have 29 protons. Any other number would be an element other than copper. The 2+ indicates that the ion has a positive charge of 2. So it is missing 2 electrons. Since a neutral atom would have 29 electrons and you're missing 2, the number of electrons will be 29 - 2 = 27 So the answer is 29 protons and 27 electrons.

Why is the nacl extracted with water three times as opposed to only once?

Answers

The NaCl is extracted three times to get maximum amount of it. Each extraction only yeilds about 50% of the NaCl from the water. So, after the tird extraction, you would have recieved around 87.5% of the total amount of NaCl from the water(50%+25%+12.5%). After the third extraction, the amount of salt in the water will only be a small amount.

NaCl is extracted multiple times with water to ensure more complete dissolution and improved recovery, as well as to remove impurities for a purified product.

The reason NaCl is extracted with water three times as opposed to only once is primarily due to the principle of solute recovery or purification. When a soluble substance like NaCl is dissolved in water, it may not fully dissolve in a single extraction. By performing multiple extractions, you ensure a more complete dissolution or recovery of the NaCl, which improves the efficiency of the extraction process. Additionally, repeated extractions can help remove impurities that are less soluble in water. Each subsequent extraction with fresh water removes a fraction of the remaining solute and any impurities, leading to a purified product.

What is the mass and charge of an electron

Answers

If a mass of a neutron is 1 the electron mass is 0.00054386734 and it's charge is negative

Answer:

Charge of -1 and a mass of 1/1836 amu

Explanation:

What is the mass number of an iron atom that has 28 neutrons?

Answers

The answer is 54

hope this helps
Final answer:

The mass number of an iron atom is calculated by adding the number of protons and neutrons. Since an iron atom universally has 26 protons and this particular atom has 28 neutrons, the mass number is 26+28=54.

Explanation:

The mass number of an atom is determined by adding the number of protons and neutrons in the nucleus of the atom. Iron (Fe) universally has 26 protons. In the given case, an iron atom has 28 neutrons. Therefore, to find the mass number, you will add the number of protons (26) to the number of neutrons (28).

So, Mass Number = Number of Protons + Number of Neutrons = 26 + 28 = 54.

Therefore, the mass number of an iron atom with 28 neutrons is 54.

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If a sulfur ion with 16 protons and 17 electrons loses one electron, what is the resulting charge?

Answers

The result will be no charge or neutral.. Because before losing an electron, the charge on ion was negative but after removal of 1 electron the charge is neutral.
Final answer:

When a sulfur ion with 16 protons and 17 electrons loses one electron, the resulting charge is 0. This is because the number of protons equals the number of electrons, resulting in no overall charge.

Explanation:

The question here asks: If a sulfur ion has 16 protons and 17 electrons and this ion loses one electron, what is the resulting charge? In order to answer this, it's important to understand that the charge of an ion is determined by the difference between the number of protons and the number of electrons. Initially, the sulfur ion had one more electron than protons, giving it a charge of -1.

However, when it loses an electron, the number of protons and electrons equal each other, resulting in a neutral ion with a charge of 0. Therefore, when a sulfur ion with 16 protons and 17 electrons loses one electron, the resulting charge is 0. This is because the number of negatively charged electrons now equals the number of positively charged protons, resulting in no overall charge.

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Combustion analysis of toluene, a common organic solvent, gives 3.52 mg of co2 and 0.822 mg of h2o. if the compound contains only carbon and hydrogen, what is its empirical formula?

Answers

C7H8 First, lookup the atomic weight of all involved elements Atomic weight of carbon = 12.0107 Atomic weight of hydrogen = 1.00794 Atomic weight of oxygen = 15.999 Then calculate the molar masses of CO2 and H2O Molar mass CO2 = 12.0107 + 2 * 15.999 = 44.0087 g/mol Molar mass H2O = 2 * 1.00794 + 15.999 = 18.01488 g/mol Now calculate the number of moles of each product obtained Note: Not interested in the absolute number of moles, just the relative ratios. So not going to get pedantic about the masses involved being mg and converting them to grams. As long as I'm using the same magnitude units in the same places for the calculations, I'm OK. moles CO2 = 3.52 / 44.0087 = 0.079984 moles H2O = 0.822 / 18.01488 = 0.045629 Since each CO2 molecule has 1 carbon atom, I can use the same number for the relative moles of carbon. However, since each H2O molecule has 2 hydrogen atoms, I need to double that number to get the relative number of moles for hydrogen. moles C = 0.079984 moles H = 0.045629 * 2 = 0.091258 So we have a ratio of 0.079984 : 0.091258 for carbon and hydrogen. We need to convert that to a ratio of small integers. First divide both numbers by 0.079984 (selected since it's the smallest), getting 1: 1.140953 The 1 for carbon looks good. But the 1.140953 for hydrogen isn't close to an integer. So let's multiply the ratio by 1, 2, 3, 4, ..., etc and see what each new ratio looks like (Effectively seeing what 1, 2, 3, 4, etc carbons look like) 1 ( 1 : 1.140953) = 1 : 1.140953 2 ( 1 : 1.140953) = 2 : 2.281906 3 ( 1 : 1.140953) = 3 : 3.422859 4 ( 1 : 1.140953) = 4 : 4.563812 5 ( 1 : 1.140953) = 5 : 5.704765 6 ( 1 : 1.140953) = 6 : 6.845718 7 ( 1 : 1.140953) = 7 : 7.986671 8 ( 1 : 1.140953) = 8 : 9.127624 That 7.986671 in row 7 looks extremely close to 8. I doubt I'd get much closer unless I go to extremely high integers. So it looks like the empirical formula for toluene is C7H8

HELP ASAP
Which of the following is the best description of the components of a biological community in the Yellowstone National Park?

A) the bison in Yellowstone
B) the bison and aspen in Yellowstone
C) the bison, aspen, and thermal features in Yellowstone
D) the bison, elk, aspen, and microorganisms in Yellowstone
E) the bison, elk, aspen, microorganisms, and season summer rainfall in Yellowstone

Answers

The best description of the components of a biological community in the Yellowstone National Park is the occurance of  the bison, elk, aspen, and microorganisms in Yellowstone. Hence Option (D) is correct.

What is Biological Community ?

A community could be a cluster or association of populations of 2 or a lot of totally different species occupying an equivalent geographic area at an equivalent time, conjointly called a biocoenosis, grouping, biological community, ecological community, or life assemblage.

Biological Community is vital as a result of it permits species interaction.

Species move at intervals a community for varied reasons, and one among them is nutrition. Animals, as an example, don't seem to be capable of creating their own food and so have to be compelled to suppose plants and alternative animals for nutrition.

Therefore, The best description of the components of a biological community in the Yellowstone National Park is the occurance of  the bison, elk, aspen, and microorganisms in Yellowstone. Hence Option (D) is correct.

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Describe how you could find the mass of the irregular object without use of a balance

Answers

The mass you can measure on a balance or a scale, and the volume is the amount of ... You can find the volume of an irregular object by immersing it in water in a ... You can use this relation backwards too -- if you know what material an object is .... Measure the volume of the water without the object in it, then carefully and ...

What is the lowest atomic number a new element can have

Answers

118 have been found, so the next lowest atomic number would be 119.

The lowest atomic number a new element can have is 119 as 118 elements are known .

What is atomic number?

Atomic number are defined as a chemical element's number in the periodic system, which places the elements in ascending order of the number of protons in their nuclei.

It can also be defined as the charge number of an atomic nucleus is represented by the nuclear charge number (symbol Z) of a chemical element.

Elements are defined as a pure substance made up only of one sort of atom, each of whose nuclei contains the same number of protons.

It can also be defined as a substance that chemistry cannot divide into simpler substances.

There are three types of elements.

Metals Non metals Metalloids

Thus, the lowest atomic number a new element can have is 119 as 118 elements are known .

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Are Si valence electrons shared?

Are C valence electrons shared?

Answers

Answer:

4

Explanation:

Si has atomic number 14 so the electronic configuration 2,8,4

Final answer:

Valence electrons of Si and C are shared in covalent bonding.

Explanation:

In a covalent bond, valence electrons are shared between atoms. The number of valence electrons an element has determines how many covalent bonds it can form. For example, carbon (C) has 4 valence electrons, so in a covalent bond, these 4 electrons are shared with other atoms.

Similarly, silicon (Si) also forms covalent bonds by sharing its valence electrons. Silicon has 4 valence electrons like carbon, so it can form 4 covalent bonds as well.

When gold is melted and formed in a mold to make a piece of jewelry, what type of change is taking place?

Answers

a physical change

Should be the answer;)
The answer to your question is:
Physical Change

Using the periodic table, determine which material is most likely to be a good insulator. magnesium silver aluminum sulfur

Answers

Ik it's not magnesium because that was my first answer. The correct answer would be Sulfur. Sulfur is a non metal. All the other answers  are good conductors of heat 

Answer:

sulfur

Explanation:

How many grams of magnesium oxide forms when 8.0g of magnesium are burned?

Answers

Final answer:

When 8.0 grams of magnesium are burned, approximately 13.26 grams of magnesium oxide are formed following the chemical reaction 2Mg(s) + O2(g) → 2MgO(s). This calculation is based on finding the equivalent moles of magnesium and magnesium oxide using their respective molar masses.

Explanation:

The question involves a chemical reaction where magnesium (Mg) is burned or reacts with oxygen to form magnesium oxide (MgO). The balanced chemical equation for this reaction is 2Mg(s) + O2(g) → 2MgO(s).

We first need the molar mass of magnesium (Mg) and magnesium oxide (MgO) to perform these calculations. The atomic mass of magnesium is 24.305 g/mol and for oxygen it's 16 g/mol. Therefore, the molar mass of magnesium oxide (MgO) is 40.305 g/mol (24.305 g/mol for Mg + 16 g/mol for O).

Next, we are given 8.0 grams of magnesium (Mg). Using its molar mass, we find this is roughly 0.329 moles of Mg (8.0g ÷ 24.305g/mol).

According to the balanced chemical equation, the stoichiometric ratio between Mg and MgO is 1:1. Therefore, 0.329 moles of Mg would react to form 0.329 moles of MgO. Converting this to grams using the molar mass of MgO (40.305 g/mol), we find that about 13.26 grams (0.329 mol × 40.305 g/mol) of magnesium oxide are formed when 8.0 grams of magnesium are burned.

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Final answer:

To determine how many grams of magnesium oxide are produced when 8.0g of magnesium are burned, the stoichiometry of the reaction between magnesium and oxygen to form magnesium oxide is analyzed. Using molar masses and the balanced chemical equation, approximately 13.26g of magnesium oxide is calculated to be produced.

Explanation:

The question concerns the chemical reaction between magnesium and oxygen to form magnesium oxide (MgO). This reaction is a classic example of a synthesis reaction where two elements combine to form a compound. In a balanced chemical equation, magnesium (Mg) reacts with oxygen (O2) to produce magnesium oxide (MgO). The balanced equation for this reaction is: 2Mg + O2 → 2MgO.

To determine how many grams of magnesium oxide forms when 8.0g of magnesium are burned, we must first understand the stoichiometry of the reaction. Since one mole of magnesium reacts with half a mole of oxygen to produce one mole of magnesium oxide, the mass of magnesium oxide produced can be calculated using molar masses and stoichiometric ratios. Given that the molar mass of magnesium is approximately 24.305 g/mol and that of magnesium oxide is approximately 40.30 g/mol, the calculation involves converting grams of magnesium to moles, then using the stoichiometric ratios from the balanced equation to find the moles of magnesium oxide produced, and finally converting this amount back to grams.

Given 8.0g of Mg, the moles of Mg can be calculated as 8.0g / 24.305 g/mol = 0.329 moles. From the balanced equation, it is clear that the moles of MgO produced would be the same (because the ratio of Mg to MgO in the reaction is 1:1), therefore, 0.329 moles of MgO. The mass of MgO produced can then be calculated as 0.329 moles × 40.30 g/mol = approximately 13.26g.

A 12.2-g sample of x reacts with a sample of y to form 78.9 g of xy. what is the mass of y that reacted?

Answers

we will assume that the only reactants are x and y and that the only product is xy.

Based on the law of mass conservation, mass is an isolated system that can neither be created nor destroyed.

Applying this concept to the chemical reaction, we will find that the total mass of the reactants must be equal to the total mass of the products,
therefore:
mass of x + mass of y = mass of xy
12.2 + mass of y = 78.9
mass of y = 78.9 - 12.2 = 66.7 grams
Final answer:

The mass of Y that reacted is 66.7 g.

Explanation:

In compound X, the mass ratio of carbon to hydrogen is 14.13 g C : 2.96 g H. This number ratio supports the law of multiple proportions, indicating that X and Y are different compounds. To find the mass of Y that reacted, you can subtract the mass of X from the total mass of XY:

Mass of Y = Total mass of XY - Mass of X
Mass of Y = 78.9 g - 12.2 g
Mass of Y = 66.7 g

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how do you preform water displacement

Answers

1. Fill a beaker or graduated cylinder with enough water to completely immerse the sphere in. 2. Record the baseline initial measurement. 3. Drop the sphere in. 4 Record final measurement.

Describe the physical properties of each state of matter

Answers

Solid - made up of tightly packed particles, which gives it a solid shape.
Gas - made up of very loose particles, giving it more freedom to roam around as a gas
Liquid - fills into whatever it gets put in, basically takes the shape of the object its in

Which of the subatomic particles is responsible for the chemical behavior of a given atom?

Answers

the electrons determine chemical behavior

Describe matter, and explain why is light is not classified as matter?

Answers

matter is anything that has mass, and light does not have mass

Matter is something that you can touch, see, taste, hear, and smell. It is also something that occupies space and has a mass. You cant touch, smell, hear, or taste light, nor does it have a mass or takes up space.

When substances go through chemical changes, which of the following will always happen?
A.
One or more substances with different chemical properties will form.
B.
One or more substances will be completely destroyed.
C.
A poisonous gas will form or a white solid will precipitate.
D.
all of these

Answers

I checked and it took me 40 min but A is the answer really hope that helped

Answer: A.  One or more substances with different chemical properties will form.

Explanation:

Chemical change is defined as a change in which rearrangement of atoms take place and leads to formation of new substance. Thus as new substances are formed, the chemical properties of the products will alwys be different from the chemical properties of reactants.

Physical change is defined as a change in which change in shape, size or state of the substance takes place. No new substance is formed.

Chemical change may involve following changes:

1) Formation of precipitates

2) Absorption or evolution of heat

3) Color change

4) Evolution of gas

Grapefruit juice is approximately ph 3, and tomato juice is approximately ph 4. a glass of grapefruit juice contains _____ h+ as a glass of tomato juice.

Answers

Grapefruit juice is approximately pH 3, andtomato juice is approximately pH 4. A glass of grapefruit juice contains _3_ H+ as a glass of tomato juice.

A glass of grapefruit juice contains ten times more H+ than a glass of tomato juice.

How many H+ ions are in a specific pH?

The pH of any solution is determined with the help of hydrogen ion concentration. For example, if a neutral solution has a pH of 7, it means that the concentration of H+ ions is [tex]10^-^7[/tex]. In other words, it may contain 0.0000001 mol of hydrogen ions in a solution of 1 liter.

According to the question,

The pH of Grapefruit juice is = 3

The concentration of H+ ions = [tex]10^-^3[/tex] = 0.001 mol.

The pH of Tomato juice = 4.

The concentration of H+ ions = [tex]10^-^4[/tex] = 0.0001 mol.

From the above concentration of both hydrogen ion concentrations, it is clearly illustrated that a glass of grapefruit juice contains ten times more H+ than a glass of tomato juice.

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According to dalton's atomic theory, when elements react, their atoms combine in

Answers

They combine in what is called a chemical bond

Final answer:

According to Dalton's atomic theory, when elements react, their atoms combine in simple whole number ratios to form chemical compounds. In chemical reactions, atoms can be combined, separated, or rearranged, but they are neither created nor destroyed.

Explanation:

According to Dalton's atomic theory, when elements react, their atoms combine in simple whole number ratios to form chemical compounds. In chemical reactions, atoms can be combined, separated, or rearranged, but they are neither created nor destroyed. This means that the number of atoms in the reactants is equal to the number of atoms in the products.

Weight measures
A. How dense an object is.
B. How large an object is.
C. The amount of mass in an object.
D. The effect of gravity on an object.

Answers

Answer: D) The effect of gravity on an object

Explanation: We're not talking about mass, we're talking about weight. Weight is measured by the force of gravity on a object. For examples, you might be 100 pounds on Earth but 12 pounds on the moon.

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