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3 years ago

When the molecules in a body move with increased speed, it's possible that the body will change from a

Chemistry

2 answers:

Tems11 [23]3 years ago

8 0

D. Liquid to gas. This is the only answer that demonstrates molecules heating up and moving quicker.

lilavasa [31]3 years ago

7 0

Your answer is going to be D liquid to a gas?
I just took the test and passed.
Hope it helps

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In a data set, the number that appears the most is called the ( ).

scZoUnD [109]

Answer:

Mode

Explanation:

The mode is the number that appears most frequently in a data set. A set of numbers may have one mode, more than one mode, or no mode at all. Other popular measures of central tendency include the mean, or the average (mean) of a set, and the median, the middle value in a set.

4 0

4 years ago

A formula unit is defined as the lowest whole number ratio of

mixer [17]

Answer: $BaF_{2}$

Explanation: Because barium is in Group 2, it forms ions with a charge of +2. Fluorine, in Group 17, form ions with a charge of -1. Cross the charges to get the subscripts (Since Ba has a charge of +2, F has a subscript of 2. Because F has a charge of -1, Ba needs a subscript of 1). Therefore, a formula unit of the compound is $BaF_{2}$ .

8 0

3 years ago

A 20.38 gram sample of cobalt is heated in the presence of excess sulfur. A metal sulfide is formed with a mass of 31.47 g. Dete

Viefleur [7K]

Answer: The empirical formula of the metal sulfide is $CoBr_{2}$ .

Explanation:

Given: Mass of metal = 20.38 g

Mass of metal sulfide = 31.47 g

Moles is the mass of a substance divided by its molar mass.

So, moles of cobalt (molar mass = 59 g/mol) are as follows.

$Moles = \frac{mass}{molarmass}\\= \frac{20.38 g}{59 g/mol}\\= 0.345 mol$

Moles of bromine (molar mass = 80 g/mol) are as follows.

$Moles = \frac{(31.47 - 20.38) g}{80 g/mol}\\= \frac{11.09 g}{80 g/mol}\\= 0.138 mol$

Now, the ratio of number of moles of cobalt and number of moles of bromine are as follows.

Moles of Co : Moles of Br = 1 : 2

Hence, the empirical formula is $CoBr_{2}$ .

Thus, we can conclude that the empirical formula of the metal sulfide is $CoBr_{2}$ .

6 0

3 years ago

Scientists claim that climate change is happening because Earth is warming. They also claim that humans have helped cause the wa

seraphim [82]

Answer:

I belive we are in climate change each year the earth gets closer to the sun and pollution from cars and factories cause the earth to warm up and cause pollution in our air. plastic is in the ocean, ice caps are melting, and the ocean is rising climate change is alredy here.

4 0

3 years ago

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A weather balloon has a volume of 52.5 liters at a temperature of 295 K. The balloon is released and rises to an altitude where

Goryan [66]

So you have a balloon rising through the atmosphere. use the formula p1/v1=p2/v2 and add the variables into the equation, leaving 295/52.5=252/x. multiply 252 by 52.5 and divide that number by 295.
52.5*252=13230. divide by 295 =44.9 L

5 0

3 years ago

Read 2 more answers