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kompoz [17]
2 years ago
9

Ok so the answer for this question, A student measured the mass of salt that can dissolve in 100 mL of water at five different t

emperatures. Which variable should go in the X axis? The answer is B, the temperature of water. I do school on k12, so if you are too this is the correct answer for you! And since this quiz was pretty hard and confusing for many of us I am going to put all the answers for this quiz! For me this quiz is called 1.11 quiz: Analyze Results.
Question 1- A student measured the maximum mass of salt that can dissolve in 100 mL of water at five different temperatures. Which variable should go in the x-axis?
-The temperature of water

Question 2-Which type of graph would best show the the data collected from measuring time for a ball to fall from varying heights?
-A scatter plot

Question 3- A student measured the flow time of 10 g of honey at different temperatures and graphed the data.
-The temperature is the independent variable.

Question 4- What is the relationship between the variables on this graph?
- As the temperature increases, the flow time increases.

Question 5- What is missing from this graph? (Not an answer put the graph is called number of sunspots each year)
-Axis Label

I hope this helped everyone out! Feel free to ask me anything in the comments, I will try to answer them as fast a I can! (Also to add in here is that I'm in k12 so if these answers aren't correct then that would be why!)
Chemistry
1 answer:
Dmitriy789 [7]2 years ago
8 0

Answer:

penguin

Explanation:

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What happens when a cold drink sits in a hot room? A) It remains coldincorrect answer B) It gets warmerincorrect answer C) It st
Natalka [10]

Answer:

its B

Explanation:

5 0
2 years ago
Suppose you wanted to make a buffer of exactly ph 7.00 using kh2po4 and na2hpo4. if the final solution was 0.10 m in kh2po4, wha
OleMash [197]

Answer:- 0.138 M

Solution:- The buffer pH is calculated using Handerson equation:

pH=pKa+log(\frac{base}{acid})

KH_2PO_4 acts as a weak acid and Na_2HPO_4 as a base which is pretty conjugate base of the weak acid we have.

The acid hase two protons(hydrogen) where as the base has only one proton. So, we could write the equation as:

H_2PO_4^-\rightleftharpoons H^++HPO_4^-^2

Phosphoric acid gives protons in three steps. So, the above equation is the second step as the acid has only two protons and the base has one proton.

So, we will use the second pKa value. The acid concentration is given as 0.10 M and we are asked to calculate the concentration of the base to make a buffer of exactly pH 7.00.

Let's plug in the values in the equation:

7.00=6.86+log(\frac{base}{0.10})

7.00-6.86=log(\frac{base}{0.10})

0.14=log(\frac{base}{0.10})

Taking antilog:

10^0^.^1^4=\frac{base}{0.10}

1.38=\frac{base}{0.10}

On cross multiply:

[base] = 1.38(0.10)

[base] = 0.138

So, the concentration of the base that is Na_2HPO_4 required to make the buffer is 0.138M.

5 0
3 years ago
How many atoms are in 8.1 moles of oxygen? And how do you know?
son4ous [18]

Answer:

4.88 x 10²⁴atoms

Explanation:

Given parameters:

Number of moles of oxygen = 8.1moles

Problem:

To find the number of atoms in 8.1moles of oxygen.

Method in solving the problem:

We know that a mole of a substance contains Avogadro’s number of particles which is 6.02 x 10²³

The particles can be molecules, atoms, etc.

Solution:

From the concept of mole,

Number of atoms =

number of moles x 6.02 x 10²³

Number of atoms = 8.1 x 6.02 x 10²³

Number of

atoms of oxygen = 48.8 x 10²³ atoms

= 4.88 x 10²⁴atoms

4 0
3 years ago
State the 2 products formed when a metal reacts with water
Nina [5.8K]

Answer:

hydroxide and hydrogen

Explanation:

When a metal reacts with water, a metal hydroxide and hydrogen are formed. Sodium reacts vigorously with water.

4 0
2 years ago
Read 2 more answers
If two electrons have same number of protons but different number of neutrons can they be atoms of the same element?
Illusion [34]
If two atoms** have the same number of protons, they are the same element. They have the same atomic number. The only thing that would change with the number of neutrons is the mass number.
6 0
3 years ago
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