How many significant figures are in the number 020.310

Answer:One Astronomical Unit is the distance between the Earth and the Sun, this acts as a sort of a cosmic metre stick. Astronomers don't and cannot measure distances. Distances are merely inferred from what actually has been measured, such as an angle, a relative luminosity, a time period

Explanation:

Answer:

you would have to use decimals in the quadrillionths if you measure in meters. so 11 0s before the number

The description of the molecules shown is it is unsaturated alkynes. The correct option is A.

Alkynes are unsaturated double bond containing compound that react with hydrogen when a catalyst is present.

The pie bond shows that the hydrogen atoms are lost from the alkanes.

Thus, the correct option is A, unsaturated alkynes.

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Explanation:

i think the answer is....b

The diagram that represents single replacement reaction is:

b.

This reaction is also known as displacement reaction. It is a reaction in which one element is substituted for another element in a compound. When a replacement reaction occurs, a new aqueous compound and a different pure element will be generated as products. For example:

[tex]2HCl(aq)+Zn(s)--->ZnCl_2(aq)+H_2(g)[/tex]

Thus, option b is correct.

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Answer:

Birds evolved from a group of meat-eating dinosaurs called theropods. That's the same group that Tyrannosaurus rex belonged to, although birds evolved from small theropods, not huge ones like T. rex.

Answer:

we haven't done anything to study the roots of the bird yet

Answer:

The first law of thermodynamics doesn't actually specify that matter can neither be created nor destroyed So yes we can create matter because matter is every where buildings ,structures etc. So the answer is yes!

Explanation:

                         Hope this helped!ヾ(•ω•`)o❤

Answer:

Crystals that grow more slowly, tend to be larger. For crystals that were grown by slow cooling of the solvent: it usually improves the quality and size of the crystals, if the solution is slowly warmed up until alomst all crystals are dissolved again and than cooled dwon a second time very slowly.

Explanation:

rystallization or crystallisation is the process by which a solid forms, where the atoms or molecules are highly organized into a structure known as a crystal. Some of the ways by which crystals form are precipitating from a solution, freezing, or more rarely deposition directly from a gas.

Answer: AgF

Explanation: 85 / 108 (the relative atomic mass of Ag) = 0.79

15 / 19 (the RAM of F) = 0.79

This is a 1:1 ratio so the empirical formula is AgF.

AgF is the empirical formula of a compound that contains 85% Ag and 15% F by mass.

A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

Molar mass of Ag =108 amu

[tex]Moles = \frac{mass}{molar \;mass}[/tex]

85 ÷ 108  = 0.79

The molar mass of F = 19amu

[tex]Moles = \frac{mass}{molar \;mass}[/tex]

15 ÷ 19  = 0.79

This is a 1:1 ratio so the empirical formula is AgF.

Hence, AgF is the empirical formula of a compound that contains 85% Ag and 15% F by mass.

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Answer:

The heaviest element to be created by exothermic nuclear fusion is Iron

Explanation:

Because it is the heaviest element produced during fusion without having to add energy, and it is the lightest element produced during fission without having to add energy. Energy-wise, everything in the universe wants to be iron! Iron is the most abundant element on Earth, making up 34.5 percent of Earth's mass.

Answer:

1st group-alkali metals

7th group-halogen group

8th group- noble gas group

Answer:

4. Group 1 in periodic table is called alkali metals.

5. Group 7 in periodic table is called halogens.

6. Group 8 or 0 in periodic table is called noble gases.

Answer:

C:sun

Explanation:

Answer:

B and D

Explanation:

it is B and D because in no gravity  if you change the size of the ball it does not change anything. and if you swing fast it does not change anything but the speed. if you change the angle it is just the same modle but different angle

Answer:

D, and E

Explanation:

they may not be correct but the answers seem correct. please tell me If I'm wrong.

Answer:

C.

Explanation:

A mixture contains two or more substances.

A compound contains elements in a fixed ratio.

P = Element

Q = Compound

R = Mixture

The correct order is C.

Answer:

2.138 x 10^26 atoms Na

Explanation:

atoms Na = 355 mol Na x (6.022 x 10^23 atoms Na/1 mol Na) = 2137.81 x 10^23 atoms Na = 2.138 x 10^26 atoms Na

The answer is gold.

Substance: Specific Heat (C) in joules per gram/degrees centigrade:

Water (ice) 2.05

Iron 0.46

Aluminium 0.90

Gold 0.13

Copper 0.39

Ammonia (liquid) 4.70

Ethanol 2.44

Gasoline 2.22

Water (liquid) 4.18

Water (vapor) 2.08

Air (25 degrees Celsius) 1.01

Oxygen 0.92

Hydrogen 14.30

To know that we clear the equation q=m*C*Δt for the specific heat (C) and solve the equation. Keep in mind that we need to use the heat (520 J) in Joules since the values from the question and the table are in Joules.

q/m∗ΔT = C = 520J/200g∗(45degC−25degC) =

0.13J/gdegC

As you can see, the substance that has this specific heat is GOLD.

The value of specific heat for the given data in the question will be for gold:-

[tex]C= 0.13\ \dfrac{J}{g^oC}[/tex]

Specific heat can be defined as the amount of heat one kg or gram substance can absorb or release for a unit temperature difference.

The formula for the heat will be:-

[tex]Q=mc\Delta T[/tex]

m= Mass of substance

c= specific heat of the substance

[tex]\Delta T[/tex]= Temperature difference

Now the given data is

m= 200 g

Q= 520 J

[tex]\Delta T[/tex]=  (45-25)=20

[tex]Q=mc\Delta T[/tex]

[tex]520=200\times C\times 20[/tex]

[tex]C= \dfrac{520}{200\times 20} =\dfrac{520}{4000} =0.13\ \dfrac{J}{g ^oC}[/tex]

Since the value of specific gold  is  [tex]0.13\ \dfrac{J}{g ^oC}[/tex]

Thus the value of specific heat for the given data in the question will be for gold:-

[tex]C= 0.13\ \dfrac{J}{g^oC}[/tex]

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Answer: It’s Lower

What can you say about the pH of a carbonic acid solution compared to that of a sulfuric acid soloution with the same contention: Strong acids dissociate fully in water to produce the maximum number of [tex]H^{+}[/tex]ions. The pH levels of strong acids are smaller than those of low acids, which is why the reactions rates for strong acids are greater than the reactions of weak acids with products like metals, metal carbonates, etc. Meaning The pH Level is lower.

Answer:

I mean i dont know......

Explanation:

Answer: The two categories is porous evidence and nonporous evidence. Nonporous item of evidence is when you put the latent print on the surface and it just sits on the surface. Porous item of evidence is when you put the latent print on the surface and it absorbs the latent print deposit.

Answer:

Invertebrates are animals which do not have vertibral column. They do not debelop it also. For example: Arthropods , Crawfish and Sea Urchin.

Answer:

Cat

Explanation:

Bcuz I said so that it's a cat

Answer:

40.3044 g/mol

Explanation:

Answer:

Yes.

Explanation:

A combination reaction can be a redox reaction.

Example; C + O2 = CO2

Answer:

Niches

Explanation:

Answer:

Electrons are trapped inside the atom because of the attraction forces with positively charged protons that are found in the nucleus.

Answer:

B is the answer

Explanation:

Answer:

Cu2+(aq) + 2OH-(aq) => Cu(OH)2(s)

Explanation:

Use of aqueous sodium hydroxide is a precipitation reaction to test for anions or cations. Aqueous sodium hydroxide in a precipitate test forms a insoluble precipitates along with some colors characteristics.

Aqueous sodium hydroxide (NaOH) when mixed with copper(II) (Cu2+) forms a blue precipitate. The formula is as follows:

Cu2+(aq) + 2OH-(aq) => Cu(OH)2(s)

Answer:

The metals are to the left of the line (except for hydrogen, which is a nonmetal), the nonmetals are to the right of the line, and the elements immediately adjacent to the line are the metalloids.