i need help with this question

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.

The ph value of human saliva is between 6.2-7.6 with 6.7 being the average pH

ph value of human saliva is 7 and 6

Answer:

Explanation:

[tex]a = \frac{force}{mass} = \frac{3750}{150} = 11.66 [/tex]

Explanation:

The chemical symbol of an element X is written as:[tex]^A_ZX^C[/tex]

Where : Charge on ion = C

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Answer:

1- charge

Explanation:

Answer:

24.088 * 10^23 atoms

Explanation:

The number of atoms in 4 moles of any atom is a constant since 1 mole has 6.022 * 10^23 atoms which is not affected by any property of any atom

So, 4 moles of Na will have 4 * 6.022 * 10*23 atoms

24.088 *10^23 atoms are present in 4 moles of any element

Answer:

PH₂ = 0.2 atm

C) About 0.20atm, because H2 comprises 20% of the total number of moles of gas.

Explanation:

To determine the partial pressure of hydrogen gas (H2) in the mixture,

Partial pressure H₂ = Ptotal * xH₂

xH₂ = Mole fraction of H₂ = ∩H₂ / ( ∩H₂ + ∩O₂ + ∩N₂)

xH₂ = 0.01 / (0.01 + 0.015 + 0.025)

xH₂ = 0.01/0.05

xH₂ = 0.2

therefore

PH₂ = pT * xH₂

PH₂ = 1.0 atm * 0.2

PH₂ = 0.2 atm

so the correct option is C)  About 0.20atm, because H2 comprises 20% of the total number of moles of gas.

The correct answer to the question is Option C. About 0.20 atm, because H₂ comprises 20% of the total number of moles of gas.

We'll begin by calculating the mole fraction of Hydrogen (H₂) in the mixture.

Mole of Hydrogen (H₂)  = 0.01 mole

Mole of Oxygen (O₂)  = 0.015 mole

Mole of Nitrogen (N₂)  = 0.025 mole

Total mole = 0.01 + 0.015 + 0.025 = 0.05 mole

Mole fraction = mole of gas / total mole

Mole fraction of Hydrogen (H₂) = 0.01 / 0.05

NOTE: The mole fraction of Hydrogen, H₂ (i.e 0.2) in the mixture is exactly 20%.

Finally, we shall determine the partial pressure of Hydrogen, H₂. This can be obtained as follow:

Mole fraction of Hydrogen (H₂) = 0.2

Total pressure = 1 atm

Partial pressure = mole fraction × total pressure

Partial pressure of Hydrogen (H₂) = 0.2 × 1

From the calculations made above, we can see that the correct answer to the question is:

Option C. About 0.20 atm, because H₂ comprises 20% of the total number of moles of gas.

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Answer:

Density of copper = 8.9 g/cm³

The density of liquid mercury is 13.6 g/cm³ which means mercury is denser than copper so copper will float on liquid mercury.

Explanation:

Given data:

weight of copper metal = 1896 g

Dimensions of block = 8.4 cm, 5.5 cm, 4.6 cm

Density of copper = ?

Will it float to the liquid mercury = ?

Solution:

Density:

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

D=m/v

D= density

m=mass

V=volume

volume of coper metal =  8.4 cm × 5.5 cm × 4.6 cm

volume of coper metal =212.52 cm³

d = 1896 g/ 212.52 cm³

d = 8.9 g/cm³

The density of liquid mercury is 13.6 g/cm³ which means mercury is denser than copper so copper will float on liquid mercury.

Answer:

1. chlorine ion 2. methylene

Explanation:

I think #2 is right. i'm not sure.

Answer:

Californium and Berkelium

Explanation:

Both are in California.

These elements are 98 and 97 on the Periodic Table of Elements, respectively.

Explanation:

From the question , arranging the organization levels from largest to smallest we have

Hope this helps you

Answer:

Organism , organ system , organ , tissue , cell

Explanation:

I took the test but it was backwards hope that helps!

Answer:

They give water to the agricultural industry.

They consume a large amount of energy.

They aid with habitat protection.

The environmental impact can be high.

They distribute accessible drinking water.

Answer:

35.8 grams

Explanation:

Multiply the density of ethyl alcohol by the volume because this will cause the units of mL to cancel out leaving you with the grams, or mass.

1.79 x 20 = 35.8

Answer:

There will be 16 electrons in O2-

Answer:

It's D

Explanation:

Trust

Answer:

option A is correct  ( sodium, calcium and barium)

Explanation:

Given compounds:

Sodium chloride , calcium sulfide, barium oxide

We know that metals form positive ions. In order to solve the problem we must identify the metals from given compounds.

Na⁺Cl⁻

Ca²⁺S²⁻

Ba²⁺O²⁻

We can see that sodium, calcium and barium contain positive charges.

Thus option A is correct.

Because sodium have one valance electron. When it combine with chlorine sodium lose its one electron to complete the octet and chlorine accept it to complete its octet. Thus sodium form positive ion and chlorine form negative ion.

Similarly barium and calcium are present in group 2. Both have two valance electron. When they lose them cation are formed.

Other option are incorrect because,

Option B have sulfur and oxygen which are anion.

Option C have chlorine which is also anion

Option D have chlorine, sulfur and oxygen that are anions.

Answer:

option A is correct ( sodium, calcium and barium)

Explanation:

Answer:2. C Hydrochloric acid

Explanation:

Answer:

the answer to #2 ic C. hydrochloric acid.

Explanation:

Answer: The concept behind hydroelectric power is simple: Rather than combusting fossil fuels, like coal, oil, or natural gas, which put over 52 million kilotons of greenhouse gases into the atmosphere each year, dams block the water flowing in rivers or lakes and use the force of the would-be flow to turn turbines,

Explanation:

Answer:

The number of energy levels increases as you move down a group as the number of electrons increases. Each subsequent energy level is further from the nucleus than the last. Therefore, the atomic radius increases as the group and energy levels increase.

Explanation:

Dose this help? Tell me if it dose.

Answer:

The modern periodic table has a lot to say about the chemical elements, besides the atomic number, atomic weight, and symbol of the identified elements. For example, chemical elements falling in the same group share common properties, which are different from other groups. Also, go through the periodic table trends and you will come to know a regular pattern in the alteration of physical and chemical properties of elements, as you go from left to right, from top to down direction, and vice versa.

Explanation:

I hope this gives an idea to your question - Good luck ^w

Answer:b

Explanation: took the test

Prism separate white light, such as that from the Sun according to their wavelength.

Prism is an optical object which have three flat polished surfaces and a triangular shape, from which refraction of light takes place.

When the sunlight or any vissible light falls on the surface of prism then the refraction of light takes place and due to refraction bending of light at different angles according to their wavelength takes place. As we know that vissible light consist all colors, so the separation of white light into the colors takes place through prism.

Hence white light gets separated through prism.

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Combining "hydro" and "genes" in the context of the Latin roots, we can interpret it as "water origin" or "water-related origin."

The term "hydro" in Latin means "water." It is derived from the Greek word "hydor," which also signifies water. "Hydro" is commonly used as a prefix in scientific terms related to water or hydrogen. In the context of chemistry, "hydro" often denotes a compound or process involving water or hydrogen atoms. For example, hydrocarbon refers to organic compounds composed solely of hydrogen and carbon atoms.

On the other hand, "genes" in Latin is derived from the Greek word "genos," which translates to "origin" or "birth." In biology, the term "genes" refers to the segments of DNA that contain instructions for the development and functioning of living organisms. Genes determine various traits, such as physical characteristics, behavior, and susceptibility to certain diseases. They play a fundamental role in the transmission of hereditary information from one generation to another.

This interpretation aligns with the understanding that hydrogen, which is essential for life and abundant in water, plays a vital role in various biological and chemical processes.

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An atom of element A has a mass of 2 units, while an atom of element B has a mass of 5 units, the ratio of element A to element B in a compound that had a mass of 11 units is 3:1

Atom are defined as smallest unit into which matter can be divided without the release of electrically charged particles.

It can also be defined as the building blocks of matter and were created after big bang theory.

Mass are defined as quantitative measure of inertia, fundamental property of all matter.

Elements are defined as a pure substance consisting of only one type of atom which all has the same numbers of protons in their nuclei.

As ratio of element A to element B is given then the ratio will be 3:1

Thus, an atom of element A has a mass of 2 units, while an atom of element B has a mass of 5 units, the ratio of element A to element B in a compound that had a mass of 11 units is 3:1

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Answer:

yes its correct

Explanation:

Answer:

B .point the test tube away from others

Explanation:

Well in science your supposed to keep it away from you and others so the aroma doesnt harm your nose or anyone eles´s nose

Hoped I helped -\

Sleepy~