What’s the question??

Answer:

Magnesium is likely to be less reactive than both strontium and sodium

Answer:

The answer is Magnesium (Mg)

Answer:

Explanation:

''A conjugate acid is formed when a proton is added to a base, and a conjugate base is formed when a proton is removed from an acid.''

In a conjugate acid-base pair, only difference between molecules is the amount of ''H''

One molecule must have 1 more H

in the last example HNO2 and H2O, difference is not only the H amount also H2O doesn't have N. So we can't say they are conjugate acid-base pair.

Answer:

Frequency of the ultrasonic sound, f=1000kHz=10

6

Hz

Speed of sound in air, V

a

=340m/s

The wavelength (λ

r

) of the reflected sound is given by the relation:

λ

r

=V/f

=340/10

6

=3.4×10

−4

m.

(b) Frequency of the ultrasonic sound, f=1000kHz=10

6

Hz

Speed of sound in water, V

w

=1486 m/s

The wavelength of the transmitted sound is given as:

λ

r

=1486/10

6

=1.49×10

−3

m.

Answer:

single covalent bond

Explanation:

The bond formed between two atoms each sharing one electron is called single covalent bond

The figure 1 is the structure of diamond. The type of bond in diamond is covalent sp³ bond. DIamond exists in hexagonal arrangement of carbon atoms.

Allotropes are substances formed from a single elements with different number in various size and shape. Carbon exhibit catenation property which means it can forms chains with other carbon in any large number.

The allotropes of carbon are diamond, graphene and fullerene. Diamond is hexagonal arrangement of carbons atom bonded covalently in sp³ hybridisation.

In graphene as shown in the second figure, bonded carbons atoms are arranged as layers where carbon is in sp²hybridisation. In the case of fullerenes, there are both hexagonal and pentagonal rings adjacent to each and are formed by 60-70 carbons.

In all these allotropes, the bond type between two carbons atoms is covalent. Covalent bond is formed by sharing of electrons between the two atoms.

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Answer:

it allows us to determine what substances will float and what substances will sink when placed in a liquid.

Answer:

c) Sodium chloride

Now

At STP any gas weighs 22.4L

Volume of H_2

The option that would lead to the formation of precipitation, release of energy or change in color  is : Chemical change

Chemical changes leads to the formation of precipitate in the form of bubbles, release of energy or change in color for example :

Hence we can conclude that The option that would lead to the formation of precipitation, release of energy or change in color  is : Chemical change

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The empirical formula of the compound containing 15.66% A and 84.34% Z as given from the question is AZ₂

Divide by their molar mass

A = 15.66 / 15.45 = 1.014

Z = 84.34 / 41.62 = 2.026

Divide by the smallest

A = 1.014 / 1.014 = 1

Z = 2.026 / 1.014 = 2

Thus, the empirical formula of the compound is AZ₂

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Let's see

moles of CO_2

Mass of CO_2

Answer:

According to the equation below salt is produced by BaH2s

Answer:

I think b is the correct answer

Answer:

1.Ecologists often estimate the size and density of. populations using quadrats and the mark-recapture method.

2. The two key components of ecosystem stability are resilience and resistance.

3.The availability of abiotic factors (such as water, oxygen, and space) and biotic factors (such as food) affect population

4. When the climate is changing in the colder direction it effects the planet in the opposite way than it does when it is changing in the warmer direction. Ad nauseam the contemporary, it’ll keep getting hotter and at a greater rate so the ecosystem is going to die.

Answer:

polypeptides in other words proteins.

Amino acids are monomers for polypeptides. Therefore, the correct option is option D.

The chemical substances known as amino acids are what make up proteins. They are crucial for the development, upkeep, and repair of our body's cells and tissues. The distinctive structure of amino acids, which consists of a core carbon atom joined to an amino group, a carboxyl group, a hydrogen atom, and a side chain known as the R-group that varies between different amino acids, is what makes them stand out from other compounds. There are 20 different amino acids that are frequently present in proteins, each of which has a unique configuration of atoms in its R-group.

Therefore, the correct option is option D.

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Answer:

An ideal gas has identical particles of zero volume, with no intermolecular forces between them. The atoms or molecules in an ideal gas move at the same speed. Almost all gases obey the gas laws within a limited range of pressures and temperatures.

hope this helps!

Answer:

fringing reef..........

Answer:

B

Explanation:

Carbon-14 will steadily decrease in a dead organism. Fossils are no different. Sense it's dead already, it will still be getting rid of the last bit of carbon-14 it has in a steadily way.

The planet Saturn rotates much more rapidly than earth, this would affect the length of Saturn's day and night.

Day and night occur on any planet due to the rotation of the planet in its own axis with respect to the position of the sun.

As speed of planet Saturn is much more as compared to the speed of planet Earth. So occurring of day and night in the Saturn takes place faster as compared to earth.

Hence, length of day and night is get affected due to the fast movement.

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Answer:

Boiling: The process of conversion from liquid to gas on heating is called boiling.

Example: Water on heating turns into water vapour.

Melting: The process of conversion from solid to liquid at room temperature is called melting.

Example: Ice cream melting at room temperature.

Sublimation: The Conversion of solid to gas directly is called sublimation.

Example: Camphor, Dry ice

Explanation:

Hope it helps you:))))

Explanation:

option option B is the correct answer of given statement helium-4(He)=2

Answer:

3AlCl₃

Explanation:

molar mass of aluminum chloride AlCl₃ is 133.33 g/mole

133.33 times 3 is 400

put 3 in front of AlCl₃

3AlCl₃

https://study.com/academy/lesson/aluminum-chloride-formula-molar-mass-decomposition.htm

Answer:

The Explanation

Explanation:

:i imagine less blue crabs ngl

Answer:

3.125g

Explanation:

100/2
50   1
50/2
25    2
25/2
12.5   3
12.5/2
6.25   4
6.25/2
3.125g   5

The new pressure of the gas would be 599.03 kilopascals

Boyles postulated that the pressure of any gas would be inversely proportional to its volume if the temperature of the gas remains unchanged.  

Mathematically: P1V1 = P2V2

In this case, P1 = 105 kilopascals, V1 = 2.031 liters, V2 = 0.356 liters.

P2 = P1V1/V2 = 105 x 2.031/0.356 = 599.03 kilopascals

Thus, the new pressure will be 599.03 kilopascals.

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Answer: 599

Explanation:

cuz i got the answer right on the test

Answer:

c.

Explanation:

The oldest insect fossil has been proposed to be Rhyniognatha hirsti, estimated to be 400 million years old, but the insect identity of the fossil has been contested. Global climate conditions changed several times during the history of Earth, and along with it the diversity of insects.

Answer:C

Explantion:This is The oldest insect fossil has been proposed to be Rhyniognatha hirsti, estimated to be 400 million years old

Answer:

.0987 moles

Explanation:

Ideal gas law     PV = n RT       R = .082057 L-atm/mol-K

7 ( .347) = n (.082057) (300)       n = .0987 moles