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Answer:

9.32×10⁻³

Explanation:

Scientific notation is the way to express the large value in short form.

The number in scientific notation have two parts.

. The digits (decimal point will place after first digit)

× 10 ( the power which put the decimal point where it should be)

How to add the number in scientific notation with same exponent.

7.21 ×10⁻³ + 2.11 ×10⁻³

exponent of both values are same thus we will take it common.

[7.21 + 2.11 ]×10⁻³

9.32×10⁻³

Answer: B

Explanation:

To solve this we must be knowing each and every concept related to CaCO[tex]_3[/tex]. Therefore,  the correct option is option B among all the given options.

Carbonate of calcium One of the best-known compounds is CaCO[tex]_3[/tex]. Calcium carbonate is indeed a non-toxic, odorless substance. CaCO[tex]_3[/tex] is a white mineral found naturally in chalks, limestones, and marbles. It is a common material found in rocks as calcite and aragonite.

CaCO[tex]_3[/tex] is most commonly found in limestone. It is a sedimentary rock composed primarily of calcite and is the primary component of eggshells, snail shells, seashells, and pearls. Calcium carbonate is also used in medicine as a source of calcium or as an antacid. Although excessive calcium carbonate ingestion is dangerous and causes poor digestion.

Therefore,  the correct option is option B.

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Answer:sodium

Explanation:

Sodium

Answer:

The SAE curriculum includes practical farming tasks conducted outside the scheduled classroom and laboratory period by students. SAEs offer a method for students in agricultural education to gain real-world work opportunities that they are most interested in in the field of agriculture. Supervised agricultural experience is an essential component of agricultural education, and all Agriculture, Food and Natural Resources (AFNR) courses are a necessary component.

Explanation: Hope it helps

Answer:

Neon

Explanation:

Chemical element Chemical series Electron configuration

3 . Li -Lithium Alkali metal [He] 2s1

4 . Be-Beryllium Alkaline earth metal [He] 2s2

5. B -Boron Metalloid [He] 2s2 2p1

6. C-Carbon Reactive nonmetal [He] 2s2 2p2

7 . N -Nitrogen Reactive nonmetal [He] 2s2 2p3

8. O-Oxygen Reactive nonmetal [He] 2s2 2p4

9. F -Fluorine Reactive nonmetal [He] 2s2 2p5

10. Ne-Neon Noble gas [He] 2s2 2p6

Answer: the 1st answer is neutrons and i think the 2nd is nucleus

Explanation:

The mass of an atom is found by adding its protons and neutrons. The electric charge of an atom is found by adding the charges of its protons and electrons.

The atomic mass of an element is the total number of protons and the number of neutrons carried by one atom of that element. The atomic mass of an element is usually expressed in grams or a.m.u.

The atomic mass of an element = No. of protons + No. of neutrons

or

The atomic mass of an element = No. of electrons + No. of neutrons

The atomic number gives us information about how many protons are inside the nucleus of the atom. Elements are recognized by the number of protons in the nucleus. Neutrons are uncharged elementary or subatomic particles that are stable when bound in an atomic nucleus.

As the electrons and protons are charged particles in an atom, therefore, the sum of the charge carried by them is equal to the electrical charge of the atom.

For a neutral atom, the number of protons present in an atom is always equal to the number of electrons.

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Answer:

7.38 days.

Explanation:

Answer:

There are 2027.52 formula units of NaCl

Explanation:

plz mark me brainlest

Answer:

It seems believable and familiar.

Explanation:

Plz mark Brainlest

Answer:

I think it's Sr and Li...

Explanation:

You just line up the elements to the mixture and whatever fits with all of the charts are the elements present in the mixture.

Answer:

Explanation:

To find the speed given the kinetic energy and mass we use the formula

[tex]v = \sqrt{ \frac{2KE}{m} } \\ [/tex]

where

m is the mass

v is the speed

From the question

KE = 15 J

m = 2.3 kg

We have

[tex]v = \sqrt{ \frac{2 \times 15}{2.3} } = \sqrt{ \frac{30}{2.3} } \\ = 3.61157559...[/tex]

We have the final answer as

Hope this helps you

Answer:

Density is commonly expressed in units of grams per cubic centimetre. For example, the density of water is 1 gram per cubic centimetre, and Earth ’s density is 5.51 grams per cubic centimetre. Density can also be expressed as kilograms per cubic metre (in MKS or SI units). For example, the density of air is 1.2 kilograms per cubic metre.

Explanation:

Answer:

oxygen is an element because it is a pure substance which cannot be split into simpler substances by chemical means

Answer:

the experimental group would be the teachers who recieved the candy

control group would be the teachers who dont get any candy

Explanation:

experimental group is the group that receives the test variable being tested in this case the variable being the candy

and the control group is the group who doesn't receive the variable

purpose of having a control is to rule out other factors which may influence the results of an experiment.

Answer:

16.3 g

Explanation:

got it right on ck

Answer:

involves the splitting of an atom into two or more fragments

Explanation:

The characteristic of nuclear fission is that it involves the splitting of an atom into two or more fragments. Details about nuclear fission can be found below.

Nuclear fission in radioactivity is a process by which the nucleus of a large atom splits into two or more smaller atoms.

Nuclear fission is usually accompanied by the release of a radioactive particle.

This suggests that the characteristic of nuclear fission is that it involves the splitting of an atom into two or more fragments.

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Answer:

2.38 mol of Al

Explanation:

To find the number of moles in a substance, you simply divide by the atomic mass. In this case, the conversion table would look as follows:

[tex]\frac{64.1 g}{1}[/tex] * [tex]\frac{1 mol}{26.98 g}[/tex]

The gram units cancel, and you are left with the answer of about 2.38 moles of Aluminum.

Answer:

C

Explanation:

Answer:

Irving Langmuir, Fatty Acid Chains

Explanation:

The man that experimented with oil and water layers in 1917 and also proposed that the ________  in the oils pointed away from the water is:

Irving Langmuir was an American scientist who was interested in the fields of Chemistry, Physics and Engineering. He won an award in Chemistry for his contributory research in surface chemistry.

He made an experiment with oil and water layers in the year 1917 and he made the claim that the fatty acid chains in oils always pointed away from tje water in which they were immersed in.

Therefore, the correct answer is option B

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To get an approximate result, multiply the mass value by 454.

hope this help!

Answer:

[Ar] 3d^104s^24p^1

Answer:

is force acting in one direction

Answer:

hope this helps!

as described by the third of Newton's law of motion of classical mechanics, offices occurs in pairs such that is one object exerts a force on another object, then the second object exerts an equal and opposite reaction Force on the first.