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3 years ago

Which statements accurately describe elements? Check all that apply.

Chemistry

2 answers:

svet-max [94.6K]3 years ago

7 0

Answer:

Elements are made up of only one type of atom.
Each element has a unique chemical symbol.
Elements can be identified by their atomic number.

Explanation:

alex41 [277]3 years ago

4 0

Answer:

2,3,4

Explanation:

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1. A scientist studies the reaction 2NO2(g) 2NO(g) + O2(g). She performs three experiments using different concentrations of NO2

DIA [1.3K]

A. The concentration ratio between trials 2 and 1 is: 0.3 / 0.1 = 3.
B. The ratio between reaction rates is: 0.054 / 0.006 = 9.
C. We solve the equation: (concentration ratio)^x = (reaction rate ratio): $3^x = 9$ , which gives x = 2, and the exponent in the rate law is 2.
D. The rate law will have the equation: r = k[NO2]^2
E. To solve for k, we can substitute the values for [NO2] = 0.1, rate = 0.006. This gives: $0.006 = k(0.1)^2$ , which yields k = 0.6 L/mol-s.
F. Since the exponent is 2, this is a second-order reaction.

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3 years ago

Why sodium chloride is a neutral compound even though it is made up of ions that have positive and negative charges?

Black_prince [1.1K]

This is key: remember it's only an ion when it transfers electrons! If it isn't going through the process of the transfer of electrons it's a neutral atom.

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3 years ago

Read 2 more answers

Does anyone get these question

OleMash [197]

I know for sure that it is francium

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3 years ago

Write a method that could be used to produce pure crystals of copper chloride from copper oxide and hydrochloric acid.

joja [24]

- Describe how you would make the salt from the reactants.

CuO + 2 HCl → CuCl₂ + H₂O

- Describe how you would purify the salt from the reaction mixture.

Filter the solution and let the product crystallize.

Explanation:

The reaction between copper oxide (CuO) and hydrochloric acid (HCl) will produce copper chloride (CuCl₂) and water:

CuO + 2 HCl → CuCl₂ + H₂O

-Describe how you would make the salt from the reactants

In a beaker which contain cooper oxide add the hydrochloric acid. To avoid working with concentrated hydrochloric acid, the acid may be diluted with water but make sure the add the stoechiometric amount (and a little bit of excess) in respect with the copper oxide.

-Describe how you would purify the salt from the reaction mixture.

Let the reaction proceed and then filter the solution to remove the unreacted cooper oxide.

Let the filtered solution, which contain copper chloride, water and unreacted hydrochloric acid, to stand undisturbed for several days. You may see the crystals growing from the solution. To speed up the process you may reduce the temperature.

Learn more about:

purifying compounds

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4 years ago

The desert sand dunes seen here are are created through the processes of?

Mariana [72]

The desert sand dunes seen here are created through the process of weathering and erosion

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2 years ago