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GrogVix [38]
3 years ago
14

Which of the following is a mixture?

Chemistry
2 answers:
Mashutka [201]3 years ago
8 0
The following term that is a mixture is answer A. Sand. Sand is a easy mixture, and a very safe one too. If you mix oxygen with carbon dioxide, both are noncombustible, but the oxygen will help a fire start. 

I hope you're doing well! Please if you could mark me brainliest?.
ValentinkaMS [17]3 years ago
3 0
Hello,

Here is your answer:

The proper answer to this question is A "sand". Sand is a mixture!

Your answer is A.

If you need anymore help feel free to ask me!

Hope this helps!
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What is the answer to this?
beks73 [17]

Answer:

hm step by step try to figure it 9ut

8 0
3 years ago
Consider the following reaction:
Goshia [24]

Answer:

2.01

Explanation:

First, let's convert grams to moles

(Na) 22.99 + (F) 18.998 = 41.988

Every mole of NaF is  41.988 grams

21/41.988 = 0.500143 moles of NaF

For every Cr+3, we will need 2 NaF, so Cr+3 will be half of NaF

0.500143/2 = 0.250071

molarity = moles/liters

0.250071/0.125 = 2.0057 M

3 0
2 years ago
Cobalt-60 is a strong gamma emitter that has a half- life of 5.26 yr. The co balt-60 in a radiotherapy unit must be replaced whe
Alenkasestr [34]

<u>Answer:</u> The sample of Cobalt-60 isotope must be replaced in January 2027

<u>Explanation:</u>

The equation used to calculate rate constant from given half life for first order kinetics:

t_{1/2}=\frac{0.693}{k}

where,

t_{1/2} = half life of the reaction = 5.26 years

Putting values in above equation, we get:

k=\frac{0.693}{5.26yrs}=0.132yrs^{-1}

Rate law expression for first order kinetics is given by the equation:

k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}

where,

k = rate constant = 0.132yr^{-1}

t = time taken for decay process = ? yr

[A_o] = initial amount of the sample = 100 grams

[A] = amount left after decay process =  (100 - 75) = 25 grams

Putting values in above equation, we get:

0.132=\frac{2.303}{t}\log\frac{100}{25}\\\\t=10.5yrs

The original sample was purchased in June 2016

As, June is the 6th month of the year, which means the time period will be 2016+\frac{6}{12}=2016.5

Adding the time in the original time period, we get:

2016.5+10.5=2027

Hence, the sample of Cobalt-60 isotope must be replaced in January 2027

3 0
3 years ago
An exergonic reaction __________ free energy, and an endergonic reaction __________ free energy.
Rashid [163]
An exergonic reaction proceeds with net release of free energy.
An endergonic reaction absorbs free energy
8 0
2 years ago
What is the color of the indicator thymol blue in a solution that has a ph of 11?.
Leviafan [203]

Answer:

Red

Explanation:

Red color is evidenced when thymol blue indicator is in a solution having a pH of 11. A pH of 11 means that the solution is basic or alkaline. Therefore, the indicator turns red, indicating that the solution is alkaline.

When thymol blue indicator is in a acidic solution, the indicator remains blue.

8 0
2 years ago
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