In ADEF, the measure of F=90°, the measure of ZD=10, and EF = 94 feet. Find the

Express your answer using two significant figures. 2.7 cm3 = m3 2.0 mm3= m3

natka813 [3]

Answer:

2.7 cm³ = 2.7 x 10⁻⁶ m³

2.0 mm³ = 2.0 x 10⁻⁹ m³

Explanation:

The values are multiplied by the conversion ratio, being sure to raise the ratio to the power of 3 so that the units properly cancel:

(2.7 cm³)(1m/100cm)³ = 2.7 x 10⁻⁶ m³

(2.0 mm³)(1m/1000mm)³ = 2.0 x 10⁻⁹ m³

8 0

2 years ago

Sodium metal reacts with water to produce hydrogen gas.

ad-work [718]

Answer:

Q1. D) A single replacement reaction takes place because sodium is more reactive than hydrogen.

Explanation: $2Na+2H_2O\rightarrow 2NaOH+H_2$ Sodium metal reacts with water to givesodium hydroxide and hydrogen gas. A single replacement reaction takes place because sodium is more reactive than hydrogen.

Sodium easily lose electrons than hydrogen and get oxidized to $Na^+$ and $H^+$ get reduced to give $H_2$ .

Q2. B) It is a single replacement reaction, and the cations in the two ionic compounds are different.

Explanation: $3Na+AlCl_3\rightarrow 3NaCl+Al$ where Sodium is a metal and $AlCl_3$ is an ionic compound. Na being more reactive than Al, displaces it from its salt solution.

Q3. D) $Zn+H_2SO_4\rightarrow ZnSO_4+H_2$

Explanation: A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution.Thus zinc can easily lose electrons as compared to hydrogen and result in the formation of zinc sulfate and hydrogen.

Q4. False

$Zn+CaCl_2\rightarrow$ no reaction

Explanation: As zinc lies lower in reactivity series, it is less reactive than calcium. It will not be able to displace calcium from its salt and hence no reaction occur. Thus the given statement is false.

Q5. False

Explanation: A double displacement reaction is one in which exchange of ions take place. Thus an element replaces another element and not same element.

A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution. Thus one element should be different from another element.

Q6. A) $Na_3PO_4+3KOH\rightarrow 3NaOH+K_3PO_4$ , because K retains the same charge throughout the reaction

Explanation: A balanced chemical reaction is one in which the number of atoms on both sides of a chemical equation are same. Also K has an oxidation state or charge of +1 in $KOH$ as well as $K_3PO_4$

5 0

3 years ago

Read 2 more answers

The boundary where two air masses meet is called a

Juliette [100K]

Answer:

front

Explanation:

Fronts represent fairly abrupt transitions between two large air masses.

6 0

3 years ago

Read 2 more answers

Order the levels of organization from the smallest (1) to the largest (4).

yKpoI14uk [10]

Answer:

cells=1

organ=3

organ system=4

tissue=2

Explanation:

i just did the question right now and i got them all correct.

3 0

3 years ago

Specific gravity is a number representing the ratio of a mineral's weight to the weight of an equal volume of water. TRUE FALSE

777dan777 [17]

Answer: True

Explanation: Specific Gravity of a body, also called its Relative Density, is the ratio of the density of that body to the density of a reference material (usually water).

With the Mathematics done right, it is evident that the specific gravity of a body would be equal to the ratio of mass/weight of the body to the mass/weight of an equal volume of water.

S.G = (Density of body)/(Density of water)

Density of Body = (mass/weight of body)/(volume of body)

Density of water = (mass/weight of water)/(volume of water)

If volume of Body = Volume of water, then,

S.G = (Mass/Weight of body)/(Mass/Weight of equal volume of water)

Proved!!

3 0

3 years ago