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Mars2501 [29]
3 years ago
13

Rina took a small ice cube and heated it in a large, closed container. First, the ice cube melted, and then the water boiled int

o steam. How did the volume of the water and the volume of the steam compare to the volume of the original ice cube?
Chemistry
1 answer:
Anton [14]3 years ago
5 0

Answer:

120 hitch hahahahahahahahahahahahahahha

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Write the structure of a D-aldohexose that gives a meso compound on treatment with NaBH4 in water.
soldier1979 [14.2K]

Explanation:

Meso compounds are optically inactive stereoisomers. Despite of having chiral carbon, they do not show  optical activity because it has a plane of symmetry in its structure itself. It is superposable on its mirror image.

Aldo sugars on reaction which reducing agents such as , NaBH₄ reduces the carbonyl group in the sugar to alcohol and gives corresponding alditol.

<u>The D- aldohexose which on reduction gives a meso alditol are allose and galactose. </u>

<u>The structure is shown in the image below. Thus, in allitol and galactitol formed have internal plane of symmetry which makes the optically inactive.</u>

7 0
3 years ago
While ALL the information in a Schumer Box is important, which items do you think matter most on a day-to-day basis?
Oksana_A [137]

Answer:

The most important information is: financial charges, annual fees, minimum payments and how the balance is calculated.

Explanation:

A Schumer Box is a table where the credit card companies disclose all the terms and conditions necessary to make a contract with them, as well as disclose all fees, charges, balances and elements that make up the credit card.

All information shown on a Schumer Box is important, but the most important is that which deals directly with the customer's money or balance. This information is: financial charges, annual fees, minimum payments and how the balance is calculated.

3 0
3 years ago
According to the data to the right, which metal will change temperature the least if 50 J of heat is added? a) Iron b) Copper c)
AlladinOne [14]
The answer to your question is answer (D)
4 0
3 years ago
The speed of light in a vacuum is 2.998 × 10 8 8 m/s. How long does it take for light to circumnavigate the Earth, which has a c
svp [43]

Answer:- 0.134 seconds

Solution:- The speed is given as 2.988*10^8\frac{m}{s} and the circumference is 24900 miles which is same as the distance light have to covered. It asks to calculate the time required to cover this distance by the light.

We need to do unit conversion from miles to meter as the speed is given in meter per second.

1 mile = 1609.34 meter

So, 24900mile(\frac{1609.34meter}{mile})

= 40072566 meters

Know that, speed=\frac{distance}{time}

It's rearranged to time as, time=\frac{distance}{speed}

Let's plug in the values in it:

time=\frac{40072566meter}{2.988*10^8\frac{meter}{second}}

= 0.134 seconds

So, the light would take 0.134 seconds to travel the mentioned speed. The answer without the unit is 0.134.

8 0
3 years ago
Convert 3.00 x 10^5 km/sec to miles/hr. (1 mile = 1.609 km)
SVETLANKA909090 [29]

Answer:

3\times 10^5\ \dfrac{km}{s}=6.71\times 10^8\ \text{miles per hour}

Explanation:

In this problem, we need to convert 3\times 10^5\ km/s to miles per hour

We know that,

1 mile = 1.609 km

1 hour = 3600 seconds

3\times 10^5\ \dfrac{km}{s}=3\times 10^5\dfrac{(\dfrac{1}{1.609}\ \text{miles})}{\dfrac{1}{3600}\ \text{hour}}\\\\=6.71\times 10^8\ \text{miles per hour}

Hence, 3\times 10^5\ \dfrac{km}{s}=6.71\times 10^8\ \text{miles per hour}

3 0
4 years ago
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