How many significant digits are in the volume measurement 0.100 L? (a) 1 (b) 2 (C) 3 (d) 4 (e) none of the above

Answers

Answer 1

Answer: C is the answer. The 1 and the two zeros behind the one are significant digits.

Answer 2

Answer:

Final answer:

The volume measurement 0.100 L consists of 3 significant digits, counting the non-zero digit and the zero after the decimal point.

Explanation:

In the volume measurement 0.100 L, there are 3 significant figures. Significant figures represent the precision of a measured value. In this case, the zeroes after the decimal point are 'leading zeroes' which are not counted as significant. The '1' is a non-zero digit, which is always significant. And the zero after '1' is a 'trailing zero' that comes after a decimal point, so it is also counted as significant. Therefore, the number of significant figures in 0.100 L is 3.

Learn more about Significant Figures here:

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The rare earth elements include

Answers

The rare earth elements include the lanthanide series, scandium and yttrium. They are a set of seventeen chemical elements in the periodic table. They really are not that rare but they occur together in nature and are hard to separate from one another.

Answer:

I tried the lanthanide series and the alkali metals and it was wrong, I think the only other option would be the lanthanide series and the actinide series.

Sorry!!!

Dave runs 2000 m in 25 minutes what is the speed

Answers

Answer: To find Dave's speed, you can use the formula for speed, which is:

Speed = Distance / Time

In this case, Dave ran 2000 meters in 25 minutes. First, you'll need to convert the time to hours, as speed is typically measured in meters per second or meters per hour. There are 60 minutes in an hour, so:

25 minutes = 25 / 60 = 5/12 hours

Now, you can calculate Dave's speed:

Speed = 2000 meters / (5/12) hours

To divide by a fraction, you can multiply by its reciprocal (flip it):

Speed = 2000 meters / (5/12 hours) = 2000 meters * (12/5) hours

Now, calculate the speed:

Speed = 4800 meters per hour

So, Dave's speed is 4800 meters per hour.

Explanation: hope this helps :D

Given the balanced equation representing a reaction at 101.3 kPa and 298 K:N2(g) + 3H2(g) => 2NH3(g) + 91.8 kJ
Which statement is true about this reaction?
(1) It is exothermic and DH equals -91.8 kJ.
(2) It is exothermic and DH equals +91.8 kJ.
(3) It is endothermic and DH equals -91.8 kJ.
(4) It is endothermic and DH equals +91.8 kJ.

Answers

Answer (4)

Endothermic processes: are those in which occurs the absorption of heat.
the change of enthalpy (ΔH) is greater than zero.

hope this helps!

Which elements can react to produce a molecular compound?(1) calcium and chlorine
(2) hydrogen and sulfur
(3) lithium and fluorine
(4) magnesium and oxygen

Answers

The elements that can react to produce a molecular compound is hydrogen and sulfur

Explanation

A molecular compound is formed when two or more atoms join by sharing electrons through a covalent bond.

Sharing of atoms occurs mainly between non metals.

Hydrogen ( a non metal) and sulfur(a non metal) react to form a molecular compound by sharing electron among themselves.
2 hydrogen atom bond with 1 atom sulfur to form hydrogen sulfide.

$\boxed{\left( 3 \right){\text{ Hydrogen and sulfur}}}$ can react to produce a molecular compound.

Further Explanation:

Covalent or molecular bond is formed when two or more non-metals share electrons between them. Such electron pairs are called bonding or shared pairs. The compounds formed as a result of these bonds are called covalent or molecular compounds.

Covalent bonds can be a polar covalent or nonpolar covalent bond. The bonds formed as a result of electron sharing between the atoms having some electronegativity difference between them are polar covalent bonds. HCl shows such type of bonding in it. The bonds formed when electrons are shared between the bonded atoms and these have no or slight difference in their electronegativities are called nonpolar covalent bonds. The bonds present in a $\text{CH}_4$ molecule are nonpolar covalent bonds.

Another type of bonding that occurs due to the complete transfer of electrons from one atom to the other is called ionic bonding. Such a process includes the formation of charged species called ions. Ions can have positive or negative charges on them. The charged species having a positive charge are cations while those having negative charges are anions.

(1) Calcium and chlorine

Calcium belongs to group 2A of the periodic table and is highly electropositive in nature. So it loses two electrons and forms $\text{Ca}^(2+)$ . Chlorine is highly electronegative in nature so two chlorine atoms accept the electrons donated by calcium and forms $\text{Cl}^-$ ions. Therefore $\text{CaCl}_2$ is formed which is an ionic compound.

(2) Hydrogen and sulfur

Both these atoms are nonmetals. So they share electrons with each other and as a result, a covalent or molecular compound is formed.

(3) Lithium and fluorine

Lithium belongs to group 1A of the periodic table and is highly electropositive in nature. So it loses an electron to form $\text{Li}^+$ . Fluorine is highly electronegative in nature and therefore it accepts the electrons donated by lithium and forms $\text{F}^-$ . Therefore LiF is formed which is an ionic compound.

(4) Magnesium and oxygen

Magnesium belongs to group 2A of the periodic table and is highly electropositive in nature. So it loses two electrons and forms ${\text{M}}{{\text{g}}^(2 + )}$ . Oxygen is highly electronegative in nature so it accepts the electrons donated by magnesium and forms ${{\text{O}}^(2 - )}$ . This results in the formation of MgO which is an ionic compound.

Therefore a molecular compound is formed when hydrogen and sulfur react with each other.

Learn more:

What is a typical characteristic of an ionic compound? brainly.com/question/6071838
What type of bond exists between phosphorus and chlorine? brainly.com/question/81715

Answer details:

Grade: High School

Chapter: Ionic and covalent compounds

Subject: Chemistry

Keywords: covalent bond, molecular bond, cations, anions, calcium, chlorine, hydrogen, sulfur, lithium, fluorine, magnesium, oxygen, molecular compound, ionic compound.

What is the mass of NH4Cl that must dissolve in 200. grams of water at 50.°C to make a saturated solution?(1) 26 g (3) 84 g
(2) 42 g (4) 104 g

Answers

Answer: It's 104 g

Explanation: yes

at 50ºC:

50 g NH₄Cl----------------- 100 g (H₂O)
? mass NH₄Cl------------- 200 g (H₂O)

mass NH₄Cl = 200 . 50 / 100

mass

Please help ASAP ty :)

Answers

Answer:

c or d it measures smallest to biggest and biggest to smallest

Answer:

your answer is a

Explanation:

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