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3 years ago

PLEASE HELP I WILL GIVE BRAINLIEST!!! Its due tonight at 12:00

Chemistry

2 answers:

Dmitry [639]3 years ago

8 0

Answer:

Explanation:

we have only distance vs time graph so c is the right answer that cart is moving with constant speed of 0.5m/s

confirmed

first calculate distance which is from 2 to 5.5

5.5-2=3.5

apply the formula of velocity

v=s/t

v=3.5/7=0.5

Charra [1.4K]3 years ago

5 0

Answer:

Answer is C

Explanation:

v= 3.5/7 = 0.5

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Chlorine consists of two isotopes with masses of 35 and 37. If the average atomic mass of a sample of chlorine atoms is 35.5, wh

Elza [17]

Answer:

The ratio 35Cl/37Cl = 3/1

Explanation:

Step 1: Data given

Chlorine has 2 isotopes:

- mass = 35 g/mol

- mass = 37 g/mol

Average molar mass of chlorine = 35.5 grams

Step 2: Calculate the % of isotopes

35x + 37y = 35.5

x+y = 1 or x = 1-y

35(1-y) + 37y = 35.5

35-35y +37y = 35.5

0.5 = 2y

y = 0.25 = 37Cl

x = 1 - 0.25 = 0.75 = 35Cl

Step 3:

The ratio 35Cl/37Cl = 0.75/0.25 = 3/1

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4 years ago

1) Write the ionic compound formulas for the element sodium and all the elements in group 6A. Example: Sodium + Oxygen=Na2O

PIT_PIT [208]

Answer:

See explanation

Explanation:

1) Group 6A elements include; O, S, Se, Te, Po

Na2O, Na2S, Na2Se, Na2Te, Na2Po

2) Group 7A elements include; F, Cl, Br, I, At

AlF3, AlCl3, AlBr3, AlI3, AlAt3

3) Group 5A elements are;

N, P, As, Sb,Bi

Mg3N2, Mg3P2, Mg3As2, Mg3Sb2, Mg3Bi2

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3 years ago

What is the sign of △S for each of the following processes? I. The separation of gaseous molecules of UF6, into 238UF6 and 235UF

gavmur [86]

Answer:

Explanation:

Entropy is the degree of randomness or disorderliness of as system. The more random a system tends, the more positive the entropy. Gases have the highest entropy whereas solids have little to no entropy.

When a reaction goes from one initally with a lower entropy to one with a higher entropy, the change in entropy, ΔS is postive. ΔS is negative when a reaction goes from one with a higher entropy to one with lower entropy.

When there is no entropy change, both the reactants and products are in the same state.

In the first reaction, UF₆ is in a gaseous phase and it was seperated into two gaseous products, 238-UF₆ and 235-UF₆. Therefore, ΔS is zero i.e no change in entropy of the system.

In the second reaction, solid I₂ is dissolved in CCl₄. The solid substance goes into solution to form a liquid medium. This is an increase in the randomness or entropy of the system. Therefore ΔS is +ve.

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3 years ago

An organism contains 28 chromosomes and undergoes asexual reproduction. How many chromosomes will each of the resulting offsprin

Marat540 [252]

Each offspring organism will contain 28 chromosomes

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3 years ago

What does the air in the troposphere do as it heats up from the sun?

Digiron [165]

It usually holds more water because of evaporation and makes the earth very hot.

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3 years ago