how many significant figures are in the following? 22.045

Answer:

4.76 × 10¯⁵ cm

Explanation:

The conversion of 476 nm to cm can be obtained as follow:

1. Conversion of 476 nm to m

Recall

1 nm = 1 × 10¯⁹ m

Therefore,

476 nm = 476 × 1 × 10¯⁹ = 476 × 10¯⁹ m

2. Conversion of 476 × 10¯⁹ m to cm

Recall:

1 m = 100 cm

Therefore,

476 × 10¯⁹ m = 476 × 10¯⁹ × 100

476 × 10¯⁹ m = 476 × 10¯⁷ cm

476 × 10¯⁹ m = 4.76 × 10¯⁵ cm

Therefore,

476 nm is equivalent to the 4.76 × 10¯⁵ cm

Answer: 5184.000 seconds

Explanation:

If there are 30 days per month then we are trying to find how many seconds the clock will gain in 180 days (30*6). If the clock gains 0.020 seconds per minute, then it gains 28.800 seconds per day (0.020*60*24). We can then multiply this by 180 days to get 5184.000 seconds.

Answer:

CO2 and O2

Explanation:

Answer:

d- Scientists have to follow government rules made to protect people.

Explanation:

Scientific research fosters our understanding of the world around us. It helps people to learn to promote critical thought and problem-solving.  Although there may not be an immediate practical use of the research, in the long term the study could benefit humanity. Scientific research is the product of creative ideas and collaborative communication that the proper role of government is often restricted to funding the research. The role of the government is to perform its reasonable and valid duties of defending human rights and enhancing the independence of the human.

Answer:D

Explanation:

Answer:

Hey there!

Gold would have a greater mass, because density is mass/volume, and if the density is greater, so is the mass.

Let me know if this helps :)

Answer:

0.0043

0.004 if to one significant figure

0 to one decimal place.

Answer:

The correct option is;

D. Calcium chloride breaks into 3 ions, while sodium chloride only breaks into 2 ions

Explanation:

To help melt the ice on icy streets, calcium chloride (CaCl₂) is a more preferred salt type to sodium chloride (NaCl) as when it dissociates into ions in the ice, it forms three ions: a calcium ion, Ca²⁺, and two chloride ions, 2 Cl⁻, while sodium chloride forms two ions: one sodium ion, Na⁺, and one chloride ion, Cl⁻

According to the freezing point depression equation, we have;

ΔT = [tex]K_f[/tex] × m × i

Where;

ΔT = Change in freezing point temperature

[tex]K_f[/tex] = The freezing point depression constant

m = The solution's molality

i = van't Hoff factor

The calcium chloride salt will cause the most depression because the van't Hoff factor is 3 for calcium chloride and 2 for sodium chloride.

Answer:

d im pretty sure i got the same answer

Explanation:

Answer:

LiH

A is lithium

group 1 or 7

Answer:

A*D²/C² = 0.347

Explanation:

A*B² = 1.8*10⁻⁷----- (1)

making A subject of formula; A = 1.8 * 10⁻⁷/B² ----(2)

C* B/D = 7.2*10⁻⁴ ----(3)

making C subject of formula; C = D * 7.2*10⁻⁴/B ----(4)

substituting the values of A and C in the equation A*D²/C²

A*D²/C² = (D² * 1.8 * 10⁻⁷/B²)/(D * 7.2*10⁻⁴/B)²

A*D²/C² = (D² * 1.8 * 10⁻⁷/B²)/(D² * 5.184*10⁻⁷/B²)

A*D²/C² = D² * 1.8 * 10⁻⁷/B² * B²/D² * 5.184*10⁻⁷

A*D²/C² = 1.8 * 10⁻⁷/5.184*10⁻⁷

A*D²/C² = 0.347

yes

Explanation

it is using the sun energy as an energy resource and is therefore Eco friendly

Hope this answer correct :)

The question is incomplete, so the complete question is as follows:

"The mixture is green in color.” This confirms that the mixture is a.

A) suspension B) solution C) colloid D) this proves nothing

Answer:

D) this proves nothing

Explanation:

The green-colored mixture does not prove anything about the mixture because only the color of mixture can not decide the typw of mixture.

Several other properties affecting the type of mixture are the size of particles and also dispersion of particles in the solution.

Hence, the correct answer is "D",

Answer:

Boyle's law: A) Pressure and volume.

Charles's law: B) Temperature and volume.

Gay-Lussac's law: C) Pressure and temperature.

Explanation:

Hello,

In this case, since Boyle's law study the relationship between pressure and volume at constant temperature as an inversely proportional one, we have:

Boyle's law: A) Pressure and volume.

Next, since the Charles' law study the relationship between the volume and the temperature at constant pressure as a directly proportional one, we have:

Charles's law: B) Temperature and volume.

Then, since the Gay-Lussac's law study the relationship between the pressure and the temperature at constant volume as a directly proportional one as well, we have:

Gay-Lussac's law: C) Pressure and temperature.

Best regards.

Answer:

D, B, E

Explanation:

Answer:

Independent variable- effect of caffeine

Dependent variable- heart rate

Hypothesis- If a stimulant such as caffeine is administered to earthworm, then its heart rate increases.

Explanation:

The experiment is based on the research question; "Does caffeine increase the heart rate of an earthworm?" We can see from this research question that the independent variable is the effect of caffeine and the response it produces is a change in the heart rate (the dependent variable)

This now leads us to a hypothesis that states thus; 'If a stimulant such as caffeine is administered to earthworm, then its heart rate increases.'

Answer:they are not the same because the composition differ

Explanation:

Answer:

Most steps were skipped they couldn't predict what it would be they couldn't really observe I font think they used very many.

Answer:

The indepandent variable is wether its hot or cold water, so the tempurature of the water. The dependant variable is how much sugar disolves.

Explanation:

The indepandant variable is what changes or has a direct affect on the depandant. The depandant is what is being mesured or tested.

Answer:

Explanation:

The Arrhenius definition of acid-base reactions, which was devised by Svante Arrhenius, is a development of the hydrogen theory of acids. It was used to provide a modern definition of acids and bases, and followed from Arrhenius’s work with Friedrich Wilhelm Ostwald in establishing the presence of ions in aqueous solution in 1884. This led to Arrhenius receiving the Nobel Prize in Chemistry in 1903.

As defined by Arrhenius:

An Arrhenius acid is a substance that dissociates in water to form hydrogen ions (H + ). In other words, an acid increases the concentration of H + ions in an aqueous solution. This protonation of water yields the hydronium ion (H 3 O + ); in modern times, H + is used as a shorthand for H 3 O + because it is now known that a bare proton (H + ) does not exist as a free species in aqueous solution.

An Arrhenius base is a substance that dissociates in water to form hydroxide (OH – ) ions. In other words, a base increases the concentration of OH – ions in an aqueous solution.

Answer:

its answer this question q1

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Inside the stomach, Hydrochloric acid kills micro-organisms in the food. Stomach juices begin to break down proteins to amino acids.

✤ So, Fill the blank with proteins.

━━━━━━━━━━━━━━━━━━━━

i) 2KClO3 → 2KCL + 3O2

ii) HNO3 + NaHCO3 → H20 + CO2

iii) 2Na + 2H2O → 2NaOH + H2

Answer:

Explanation:

Solubility of KNO₃ at 20° C = 32 g / 100g of water

that means , per 100 g of water maximum of 32 g of  KNO₃ can be dissolved at 20° C .

Solubility of KNO₃ at 40° C = 62 g / 100g of water

that means , per 100 g of water maximum of 62 g of  KNO₃ can be dissolved

40° C.

So when a saturated solution in which maximum KNO₃ has been dissolved is cooled from  40° C to 20° C , due to decrease in solubility at lower temperature some KNO₃ will come out of the solution . Per 100 gram of saturated solution , 62 - 32 = 30 g of KNO₃ will precipitate out or come out of water . They can be filtered out .

Answer: Matter

Biosphere

Explanation:

The substance that occupies space and mass is called matter, and the biosphere is the part of the earth that includes life. Thus, the correct options are 1. c and 2. b.

A matter has been defined as a substance that is made of atoms and has a mass that results in it occupying some space. The matter can be in the form of liquid, solids, or gas. The matter is present everywhere and can be interconnected. Thus, 1. c is correct.

The biosphere is defined as the sphere that combinedly comprises the hydrosphere, lithosphere, and atmosphere and is the part where life exists on the earth. It includes the elements air, water, land, etc., and all the ecosystems that range from oceans to mountains. Thus, 2. b is correct.

Therefore, options 1. c. matter and 2. b. the biosphere is correct.

Learn more about the matter, here:

https://brainly.com/question/9402776

#SPJ2

Your question is incomplete, but most probably your full question was,

1. Anything that has mass and takes up space

2. The part of the earth in which life exists including land water and air

Answer:

She gave them bottles with labels showing the brands

Explanation:

the teens could have been biased due to knowing the brand. It would have been more reliable if the label was covered or removed.

Answer:

Explanation:

reaction A is an acid base reaction

here MgO  is base and H2SO4  is an acid

reaction B is an acid base reaction

here CO3^-² is  weak base and H+ is an acid

reaction D is an acid base reaction water is amphoteric in nature here it behave like base and HCL is an acid

reaction F is acid base reaction

here NH3 is an base  and HCL  is an acid

reaction G is acid base reaction

here NaOH is base and HCL is an acid

in reaction c and e Al is hard acid and Cu is soft acid and HCL is acid and Zn is base but i m not confirmed that these reactions are acid base or not

Explanation:

To change from m to cm, divide by 100

[tex] \frac{98.723}{100} \\ = \: 0.98723cm[/tex]

Answer:

Oxygen or sulfur I believe since they fall in the same group.

Answer:

Oxygen is one of them.

Answer:

Dmitri Mendeleev

Explanation:

Dmitri Mendeleev published the first recognizable periodic table in 1869, developed mainly to illustrate periodic trends of the then-known elements. He also predicted some properties of unidentified elements that were expected to fill gaps within the table. Most of his forecasts proved to be correct

Answer:

Mendeleev periodic table

Explanation:

In 1869, just five years after John Newlands put forward his

Law of Octaves, a Russian chemist called Dmitri Mendeleev

published a periodic table. Mendeleev also arranged the

elements known at the time in order of relative atomic mass

Answer:

sodium ion

Explanation:

Answer:

The charge of nucleus will be +2.

Explanation:

Given that,

Proton = 16

Neutron = 14

electron = 18

We know that,

Atomic number :

The number of proton in the nucleus is equal to the atomic number.

The number of protons is equal to the number of electrons for neutral atom.

So, the atomic number is same as the number of electrons.

Here, the number of electron is more than 2 of number of proton.

Hence, The charge of nucleus will be +2.