Convert 16 years to days?

Answer: D- Alpha

Explanation:

Answer:

0.00079

Explanation:

Any zero after the decimal isn’t a significant figure

Answer:

The mass of KF in the mixture is 2.77 gms.

Explanation:

Given;

Total weight of mixture (LiF+KF)=5.32gms

Let, mass of KF in the mixture = x gms

⟹ mass of LiF in mixture =(5.32-x)gms.

We know that :

Atomic weight of F=19gms.

Atomic weight of Li =7gms.

Atomic weight of K = 39 gms.

moles=mass/(molecular weight)

Thus, moles of KF=x/58

and moles of LiF = (5.97-x)/26LiF=(5.97−x)/26

Thus,

moles of F in KF=moles of KF=x/58 ---(1)

moles of F in LiF =moles of LiF= (5.32-x)/26---(2)

From (1) & (2),

Total moles of Fluorine

=(x/58)+((5.32-x)/26)

Hence,

total weight of Fluorine in sample = moles*Atomic weight

=((x/58)+((5.32-x)/26))*19gms.

=3.12 gms.---(given)

Now, solving the equation for x,

26x +(5.32*58)-58x

=3.12*58*26/19

22x=308.56-247.62

x=60.94/22

=2.77 gms. (Answer)

Thus, the mass of KF in the mixture is 2.77 gms.

Explanation:

Law of conversation of mass applies in any chemical reaction.

The number of moles can be different for each compound being used, as it is based on the different molar masses of each compound.

Hence, the answer is C. mass and number of atoms.

To solve this we must be knowing each and every concept related to experiment. Therefore, the correct option is option A that is to leave the room and go to an area with fresh air.

Any procedure where measurements are taken and tests are run to support or disprove a hypothesis is referred to as a scientific experiment.

A science class is conducting an experiment that produces noxious fumes. Because of inadequate ventilation, some students begin to feel nauseated and dizzy. The first response should be to leave the room and go to an area with fresh air.

Therefore, the correct option is option A that is to leave the room and go to an area with fresh air.

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https://brainly.com/question/11205647

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Answer:

it adds up to 25000 grams

Answer:

alkali metals

Explanation:

alkali metals

The alkali metals, found in group 1 of the periodic table (formerly known as group IA), are very reactive metals that do not occur freely in nature. These metals have only one electron in their outer shell. Therefore, they are ready to lose that one electron in ionic bonding with other elements.

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Given :

Mass of oxygen containing carbon monoxide (CO) is 2.666 gram .

To Find :

How many grams of carbon (C) would be present in carbon monoxide (CO) that contains 2.666 grams of oxygen (O) .

Solution :

By law of constant composition , a given chemical compound always contains its component elements in fixed ratio (by mass) and does not depend on its source and method of preparation.

So , volume of solution does not matter .

Moles of oxygen , [tex]n=\dfrac{2.666}{16}=0.167\ mole[/tex] .

Now , molecule of CO contains 1 mole of C .

So , moles of C is also 0.167 mole .

Mass of carbon , [tex]m=12\times 0.167=2\ g[/tex] .

Therefore , mass of carbon is 2 grams .

Hence , this is the required solution .

OK, so since this question is corrupt, lets fix this.

Answer:

1. Sublimation: C

2: Melting: B

3: Freezing: D

4: Evaporation: A

Explanation:

In the lesson, we learned that Sublimation is like a solid turning into gas (vapor). For melting, we learned that it is a solid that turns into a liquid, example of melting is snow turning into water. For Freezing, we learned that it is a liquid turning into a solid, example of freezing is water turning into snow. For evaporation, it is a solid turning into a gas like vapor for example, example of evaporation: We know that when we mix Dry Ice with water, we get a chemical reaction, Dry Ice with water creates carbon dioxide smoke (fog).

Hope this answer helps!

I had this on my science test! A liquid changes into a solid is called freezing or solidation. The process of a solid becoming a liquid is called melting. A gas changes to a solid is called sublimation. When a gas changes into a liquid, it is called condensation. A liquid changes to a gas is called evaporation!

I never ask, but can I have Brainlest PLS?

Answer:

a lot of heat source

Explanation:

Answer:

FALSE

Explanation:

Answer:

A.

Explanation:

The chemical equation in which the number of atoms in the reactants is the same as that of products would be Zn + 2HCl → H2 + ZnCl2. The correct option would be A.

Let us consider all the component atoms in the equation: Zn + 2HCl → H2 + ZnCl2

In Li2CO3 → LiO + CO2:

In CO2 + H2O → CH2OH + O2

In CH4 + O2 → CO2 + 2H2O

Hence, the only equation in which the number of atoms in the reactants is the same as that of products is Zn + 2HCl → H2 + ZnCl2

More on balancing chemical equations can be found here: https://brainly.com/question/21049751

Given :

Mass of foil , m = 1.68 g .

Density of foil , [tex]\rho=7.31\ g/cm^3[/tex] .

To Find :

The thickness of the foil .

Solution :

Let , length and breadth is l and b respectively .

Also , height be h .

Volume is given by :

[tex]V=l\times b\times h[/tex]

Density is given by :

[tex]\rho=\dfrac{m}{V}\\\\V=\dfrac{m}{\rho}\\\\l\times b\times h=\dfrac{1.68}{7.31}\\\\l\times b\times h=0.23\\\\h=\dfrac{0.23}{lb}[/tex]

Therefore , thickness of the foil is [tex]\dfrac{0.23}{lb}[/tex] .

Hence , this is the required solution .

Answer:

this does not look like chemistry but I believe your answer is 50.9439

Explanation:

hope it helps

Explanation:

Never smoke near a place where hydrogen is generated or being used. Remove all possible sources of flame and sparks. Hydrogen should only be generated and used in a well ventilated out door area. Precautions must be taken to remove all possibilities of fire or explosion.

Answer:

False

Explanation:

because they do not prevent damage they make damage

Iodine is less reactive

Answer: Iodine is less reactive in comparison to Lithium

Answer:

yes

Explanation:

Answer:

65.21g

Explanation:

[tex](48.89 \div 100) \times 63.929 = 31.25 \\ (27.81 \div 100) \times 65.996 = 18.35 \\ (23.3 \div 100) \times 67.002 = 15.61 \\ 31.25 + 18.35 + 15.61 = 65.21[/tex]

Answer:

A = 8

B = 8

C = O ( Oxygen )

D = 26

E = 30

F = Fe (Iron)

Explanation:

1)To get "A" we use the following formula

mass number = number of protons + number of. neutrons

15 = number of protons + 7

15 - 7 = number of protons

8 = number of protons

A = 8

2)To find "B"

atomic number = number of protons

Atomic number = 8

B = 8

3)To find "C"

the atomic number is 8 so the element which

has 8 atomic number on periodic table is Oxygen.

C = oxygen

4) To get "D"

Number of protons = atomic number

number of protons = 26

D = 26

5)To get "E"

mass number = number of protons + number of. neutrons

56 = 26 + number of neutrons

56 - 26 = number of neutrons

number of neutrons = 30

E = 30

6) To find "F"

The atomic number is 26 so the element which has 26 atomic number on periodic table is Iron.

hope it helps

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Answer:

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Answer:

A compound because it cannot be found on the periodic table

Explanation:

Answer:

Explanation:

is the stronger

both will be equally strong because when you add them together with a pretty much equal ph such as 5 and 9 ph then it makes it neutral meaning they are just as strong as eachother

Answer:

1.a member of carbon family  with 14 eletrons is silicon

2.halide which is liquid at room temperature is bromine

3.transition metal with 79 electrons/protons and neutron 80 for me Is Gold

Answer:

The atomic theory has changed over time as new technologies have become available. Scientific knowledge builds on past research and experimentation. 400 B.C. Democritus, a philosopher in ancient Greece, began the search for a description of matter.

Explanation: