which one is it…need help ASAP!!!

Answer:

Thermal energy transfers hear from the students hand to the ice

Answer:

single, double, and triple bonds

Answer:

second (S) is the SI unit of time.

Answer:

second

Explanation:

the gap between any two intervals is called time

time can be measured in hour,minute,second

but second is the SI unit of time

Answer:

[tex]{ \sf{Al _{2} O _{3(s)} + 6HCl _{(aq)} → 2Al Cl _{3(aq)} + 3H _{2} O _{(l)} }}[/tex]

Answer:

I think you have to put a coefficient of 6 in front Hcl,and a 2 infront of AlCl3 then a 3 in front of H2O,so that you can have 2 Al on both sides,6 Hcl,6 Cl and 3 o.

Al2O3+6HCl--->2AlCl3+3H2O.

I hope this helps

Answer:

I HOPE THE ABOVE INFORMATION WILL HELP YOU A LOT.

The volume of the liquid from the graduated cylinder is 22.5 mL

The last option (22.5 mL) is the correct option

The question seems to be incomplete

The image that completes the question is shown in the attachment below.

From the image, we observe that the liquid meniscus is between the 20 mL and 25 mL marks. That means the volume will lie in this range.

NOTE: The meniscus of a liquid is the upward or downward curve seen at the top of a liquid in a container.

The type of curve shown in the image is a concave meniscus and the volume of the liquid is read from the bottom of the curve.

To read the value from the graduated cylinder, we will first determine the difference between two consecutive lines. Between the 20 mL and 25 mL mark (two thick lines), we have 5 spaces separated by thin lines.

The measure between two consecutive lines is the difference between two thick lines divided by number of spaces between them

∴ The measure between two consecutive lines = (25mL - 20mL) ÷ 5

The measure between two consecutive lines = 5mL ÷ 5 = 1 mL

Now, to read the position of the liquid,

Starting from the 20 mL mark, the liquid exceeds two more lines + half way to the next line ( that is 2mL + 0.5 mL)

∴ The position of the liquid is 20 mL + 2mL + 0.5 mL = 22.5 mL

Hence, the volume of the liquid from the graduated cylinder is 22.5 mL

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Answer:

The answer is  22.5 mL

Explanation:

I hope this helps you :)

Answer: i took the test

Explanation:

the answer is c

Helium is a noble gas with a stable electronic configuration. It differs from other elements in group 18 as it has two valence electrons, while the rest of them has 8 valence electrons. Thus, option a is correct.

Helium is a noble gas or inert gas placed in group 18 of the periodic table with atomic number 2. It is an s-block element as its valence electron lies in the s- subshell. Its configuration is,

He (2) ⇒ 1s²

The other elements of the group include neon, krypton, radon, xenon, and argon which have eight valence electrons in their outermost shell of the atom that completes their octet and makes them stable.

Therefore, option a. the helium differs from the other noble gas of the same group as it has two valence electrons while others have eight valence electrons.

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Same molecular structure and same properties.

Molecular structure is three dimensional structure in which arrangement of atoms is placed.

The molecular structure of a compound determines the polarity and its reactivity.

The different states of matter solid, liquid and gas have different molecular structure and different properties from each other.

The molecular structure of a molecule will have same properties as of the entire molecule based on its state.

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Answer:

the location of atoms, groups, or ions relative to one another and the number, type, and location of covalent bonds

Answer:

Force = Pressure × Area

Explanation:

Easy, just invert the equation. Transpose the force variable over to the left of the equals sign, and transpose the pressure variable back to the right side.

Answer:

Hydrogen bromide, anhydrous appears as a colorless gas with a pungent irritating odor. Corrosive. Heavier than air. Prolonged exposure to fire or intense heat may result in the violent rupture and rocketing of the container. Long-term exposure to low concentrations or short-term exposure to high concentrations can result in adverse health effects from inhalation. Used to make other chemicals and as a catalyst in the manufacture of chemicals. Rate of onset: Immediate Persistence: Minutes to hours Odor threshold: 2 ppm Source/use/other hazard: Chemical manufacturing industry; very corrosive.

Explanation:

HBr

Answer:

NH3 and NH4NO3

Explanation:

I took the test and guessed this since I couldn't find it here, it turned out to be correct so I thought I'd share.

The substances that can react with HNO3 to neutralize it  are NH3 and NH4NO3.

The term neutralization has to do with the reaction between an acid and a base to yiled salt and water only.

The substances that can react with HNO3 must be basic substances hence the substances required are NH3 and NH4NO3.

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Answer:

Explanation:

48000 minutes [ 1 hour  / 60 min ] 1 day / 24 hours ] [365 days / year]

48000 * [ 1/(60 * 24 * 365)]

48000 * [1 / 525600]

There are 0.0930954years in 48000 minutes

Answer:

[tex]\boxed {\boxed {\sf 3. \ GAGCTC}}[/tex]

Explanation:

Amino acids are the monomers or building blocks of protein. Proteins are created during protein synthesis according to the genetic information or DNA in an organism.

The DNA is translated to messenger RNA in the nucleus. It travels to the ribosome. There, the mRNA is "read off" in threes. Three nucleotides make up  a codon. Transfer RNA with the corresponding anticodon and an amino acid attaches to the codon and a chain of amino acid forms.

If 3 nucleotides make 1 codon which makes 1 amino acid, then we need double that or 6 nucleotides to make 2 amino acids.

The only answer choice with 6 nucleotides is Choice 3: GAGCTC

Answer:

1;1, 2;1, 3;1, 1;2, 1;1, 3;2, 1;3, 2;3, 1;1.

I hope this will help.

Answer:

This is what the answer looks like

Explanation:

Answer:

test tube

Explanation:

test tube is a very small thin glass in the science lab and it's contain small amount of chemicals as they react

Answer:

C

Explanation:

Answer:

Conditions to Avoid: Natural gas is extremely flammable and explosive; avoid heat, sparks, open flames, and all possible sources of ignition. Heat will increase pressure in containers used to store natural gas.Jun 1, 2015

Answer:

Natural Gas can be explosive or flammable depending on it's concentration in air.  

Natural gas has a flammability range of approximately 5 to 15 percent.

Any percentage greater than that is explosive for natural gas.

Hope this helps.

Answer:

D. It will shift towards the exothermic reaction.

Explanation:

Answer:

A

Explanation:

Because of the vibration

Answer:

A

Explanation:

Because of the vibration

Answer:

a) NaSO4+Bacl2 -> Baso4+2Nacl

b) 4C3H3+15O2 -> 12CO2+6H2O

Explanation:

The atoms at the reactants is equal with the product.

Answer:

Electrons can have a measured radius.

Electrons do not have energy, the energy is determined by the orbit.

Explanation:

because I have got it right.

The correct answer is, "Electrons do not have energy, the energy is determined by the orbit."

In the Bohr model of the atom, electrons are arranged in energy levels. The energy of an electron is determined by the energy level in which it is found.

When electron an the  electron moves from a lower to a higher energy level it absorbs energy. When the electron moves from a higher to a lower energy level, it radiates energy. This energy is observed in the form of visible light.

Thus, in the Bohr's model, electrons are arranged in energy levels. The energy level where an electron is found determines its energy.

For more about the Bohr model, see:

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Answer:

Dùng nam chân hút đc bột sắt ra khỏi hỗn hợp

Bột gỗ và bột nhôm thì bột gỗ tan trong nước còn bột nhôm thì không

Explanation:

Answer:

An element which does not have two or eight electrons in its valence shell is unstable. It get stability by losing, gaining or sharing electron to complete noble gas electronic configuration. ... Elements attain stability by completing duplet or octet.

Answer:

100 times more acidic.

Explanation:

If you look at the pH scale, pH2 is 2 "jumps" away from pH4, therefore, pH2 is 100x more acidic than pH4.

Answer:

Why is the unit of force called a derived unit? That's because the Newton is defined in terms of other units which are more fundamental. One Newton is the force required to accelerate a mass of one kilogramme at the rate of one metre per second squared.