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andreyandreev [35.5K]
3 years ago
5

List 3 elements that have similar properties or reactivity. Justify your answer with reasoning.

Chemistry
1 answer:
Rus_ich [418]3 years ago
7 0

Answer:

Lithium, Potassium and Calcium

Explanation:

Because they are all in group one of the periodic table

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A standard solution contained 0.8 mg/mL. A student took 2 mL of the standard solution and added 10 mL of water. What is the new/
galben [10]
To get the concentration of the second solution let us use the following formulae

C1V1=C2V2 where C1 is concentration of first solution and V1 is the volume of solution first solution. on the other hand C2 is the concentration of second solution and V2 is the volume of second solution.

therefore

0.8×2=(2+10)×C2
   1.6 =12×C2
1.6/12=C2
C2     = 0.1333mg/mL
7 0
3 years ago
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Carbon is a synthetic element and is not normally found in nature.<br><br> True or False
Inessa05 [86]
False. Carbon is definitely one of the 92 naturally occurring elements within the periodic table.
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3 years ago
Which provides evidence to support the big bang theory?
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A<span>. </span>
<span>the change in carbon dioxide levels in the atmosphere 
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hope that's right and hope i helped




6 0
2 years ago
Find the density if the volume is 15 mL and the mass is 8.6 g. (5 pts)
allsm [11]

Answer:

\large \boxed{\text{0.57 g/mL; 3.7 mL; 6.6 g; 0.366 g/mL}}

Explanation:

1. Density from mass and volume

\text{Density} = \dfrac{\text{mass}}{\text{volume}}\\\\\rho = \dfrac{m}{V}\\\\\rho = \dfrac{\text{8.6 g}}{\text{15 mL}} = \text{0.57 g/mL}\\\text{The density is $\large \boxed{\textbf{0.57 g/mL}}$}

2. Volume from density and mass

V = \text{9.7 g}\times\dfrac{\text{1 mL}}{\text{2.6 g}} = \text{3.7 mL}\\\\\text{The volume is $\large \boxed{\textbf{3.7 mL}}$}

3. Mass from density and volume

\text{Mass} = \text{4.1 cm}^{3} \times \dfrac{\text{1.6 g}}{\text{1 cm}^{3}} = \textbf{6.6 g}\\\\\text{The mass is $\large \boxed{\textbf{6.6 g}}$}

4. Density by displacement

Volume of water + object = 24.6 mL

Volume of water                =<u> 12.8 mL</u>

Volume of object               = 11.8 mL

\rho = \dfrac{\text{4.3 g}}{\text{11.8 mL}} = \text{0.36 g/mL}\\\text{The density is $\large \boxed{\textbf{0.36 g/mL}}$}

Your drawing showing water displacement using a graduated cylinder should resemble the figure below.

 

6 0
3 years ago
Which of the following statements would be best described as an expression of an attitude that is low in accessibility and high
Zepler [3.9K]

Answer:

Ralph: "I'm not sure about bananas. I'd have to think about it."

Explanation:

3 0
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