All categories

3 years ago

Which of the following is considered a standard unit of length in the United States?

Chemistry

1 answer:

spin [16.1K]3 years ago

3 0

Answer:

Yard . I hope this helped:))

You might be interested in

How do isotopes of the same atom react chemically? How do isotopes of the same atom compare in size?

Katyanochek1 [597]

Atoms of the same elements differing in the number of neutrons in their nuclei are known as isotopes. Thus, isotopes of an element have the same atomic number but different atomic mass number. Isotopes of an element have similar chemical properties but different physical properties.

7 0

3 years ago

La formula estructural del eter butil pentilico

Mama L [17]

Answer:

do you mean?

Explanation:

the structural formula of butyl pentyl ether

3 0

3 years ago

9. How long will it take 120 grams of Strontium-90 to decay to 7.5 grams?<br>with steps pls

ryzh [129]

Answer:

116 years

Explanation:

To solve this, we will use the half life equation;

A(t) = A_o(½)^(t/t_½)

Where;

A(t) is the amount of strontium left after t years;

A_o is the initial quantity of strontium that will undergo decay;

t_½ is the half-life of strontium

t is the time it will take to decay

We are given;

A(t) = 7.5 g

A_o = 120 g

From online values, half life of strontium-90 is 29 years. Thus, t_½ = 29

Thus;

7.5 = 120 × ½^(t/29)

Divide both sides by 120 to get;

7.5/120 = ½^(t/29)

0.0625 = ½^(t/29)

In 0.0625 = (t/29) In ½

-2.772589 = (t/29) × (-0.693147)

(t/29) = -2.772589/(-0.693147)

t/29 = 4

t = 29 × 4

t = 116 years

5 0

3 years ago

How do I calculate this slope?

zmey [24]

Rise over run. Just like you have set up. If you plotted the data points subtract (y2-y1)/(x2-X1)

6 0

3 years ago

Classify the following dienes and polyenes as isolated, conjugated, cumulated, or some combination of these classifications.

lawyer [7]

Answer:

cycloocta-1,4-diene- isolated double bond

cycloocta-1,3-diene- conjugated double bond

cyclodeca-1,2-diene- cumulated double bond

cycloocta-1,3,5,7-tetraene- conjugated double bond

cyclohexa-1,3,5-triene (benzene) - conjugated double bond

penta-1,2,4-triene- cumulated and conjugated double bond

Explanation:

A conjugated double bond is a system that contains alternate double and single bonds. It is renowned for its unusual stability.

A cumulated double bond is a double bond system involving about three atoms e.g C=C=C.

An isolated double bond is a system of double bonds separated by more than one single bond.

8 0

4 years ago