Convert 8.5 x 10-3 mm to micrometers

Answers

Answer 1

Answer:

Explanation:

1mm = 10^-3 micrometre

8.5 x 10^-3 mm = 8.5 x 10^-6 micrometre

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Could a prokaryote have tissue , organs , and organ system ?

Answers

Prokaryotes are usually unicellular - and so would not have tissue, organs or organ systems.Some prokaryotes are multicellular, and you could potentially say that they are a tissue (many similar cells working together to perform a task). However, no prokaryotes have organs or organ systems.

no they are usually uni-cellular

How many moles of NO3 are there in 6.2g?

Answers

Answer : The number of moles of $NO_3$ is, 0.1 moles

Solution : Given,

Mass of $NO_3$ = 6.2 g

Molar mass of $NO_3$ = 62 g/mole

Now we have to calculate the moles of $NO_3$ .

$\text{Moles of }NO_3=\frac{\text{Mass of }NO_3}{\text{Molar mass of }NO_3}=(6.2g)/(62g/mole)=0.1moles$

Therefore, the number of moles of $NO_3$ present in 6.2 g is, 0.1 moles

6.2 divided by the mass number of NO3 is 0.1 moles. Anytime your trying to find the moles of something you divide it by the mass number of your combined elements.

Chemistry Questions 3. What is true of a strong acid? A. It ionizes close to 100% in water B. It is a weak electrolyte C. It does not conduct electricity in solution D. It always has a high concentration 4. What substance is acting as the Bronsted-Lowry base in the forward reaction below? H2O + HCl --> H3O+ + Cl- A. H3O+ B. Cl- C. H2O D. HCl 5. Which of the following is NOT an acid-base neutralization reaction? A. NH3 + HCl --> NH4Cl B. NaOH + CH3COOH --> Na CH3COO + H2O C. 2 HNO3 + Ca(OH)2 --> Ca(NO3)2 + 2 H2O D. H2SO4 + 2 NaCl --> 2 HCl + Na2SO4

Answers

Answer:

For 3: The correct answer is Option A.

For 4: The correct answer is Option C.

For 5: The correct answer is Option D.

Explanation:

For 3:

There are 2 types of solutions on the basis of pH.

An acid is defined as the chemical substance which looses hydrogen ions in a solution.

A weak acid does not completely dissociates into its ions but a strong acid completely dissociates into its ions when dissolved in water.

A base is defined as the chemical substance which looses hydroxide ions in a solution.

A weak base does not completely dissociates into its ions but a strong base completely dissociates into its ions when dissolved in water.

Hence, the correct answer is Option A.

For 4:

According to the Bronsted Lowry conjugate acid-base theory, an acid is defined as a substance which donates protons and a base is defined as a substance which accepts protons.

For the given chemical equation:

$H_2O+HCl\rightarrow H_3O^++Cl^-$

$H_2O$ is considered as a bronsted-lowry base because it is accepting hydrogen ion to form hydronium ion

HCl is considered as a bronsted-lowry acid because it is donating hydrogen ion to form chloride ion.

Hence, the correct answer is Option C.

For 5:

Neutralization reaction is defined as the chemical reaction in which an acid reacts with a base to produce a salt and water molecule.

$HX+BOH\rightarrow BX+H_2O$

For the given options:

Option A:

The chemical equation follows:

$NH_3+HCl\rightarrow NH_4Cl$

This is an example of neutralization reaction because ammonia is considered as a base and when it reacts with HCl, it leads to the production of salt.

Option B:

The chemical equation follows:

$NaOH+CH_3COOH\rightarrow CH_3COONa+H_2O$

This is an example of neutralization reaction.

Option C:

The chemical equation follows:

$2HNO_3+Ca(OH)_2\rightarrow Ca(NO_3)_2+2H_2O$

This is an example of neutralization reaction.

Option D:

The chemical equation follows:

$H_2SO_4+2NaCl\rightarrow 2HCl+Na_2SO_4$

This is an example of double displacement reaction.

Hence, the correct answer is Option D.

Strong acid does not conduct electricity. Question 4} A. H30 Question 5 } B. NaOH + CH3COOH

What is the charge on an electron?

Answers

Answer

1.60217662 × 10-19 coulombs

Explanation:

Why is mass conserved in
chemical reactions?

Answers

Even in a chemical reaction when atoms interact and create new products, mass is conserved. This is because the new substances created are composed of atoms that were present in the reactants. ... No new atoms have entered or left the system so the mass is conserved.

a gas in a balloon at constant pressure has a volume of 120.0 mL at -123°C. What is the volume at 27.0°C?

Answers

The law that can be applied here is Charle’s Law which states that for a fixed mass of gas and at constant pressure, the volume is directly proportional with the absolute temperature. It is represented by the equation of V1/T1=V2/T2. Since there is no negative volume, we will change the temperature into Kelvin, (-123+273=150K) and (70+273=300K). plugging in the values, V2 = (300K)(120mL/150K) we get a volume of 240mL.

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