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lianna [129]
3 years ago
11

I need help please Which option is chemical change?

Chemistry
1 answer:
MrRa [10]3 years ago
8 0

Answer:

Getting coated with tarnish

Explanation:

Silver, the original substance is combining with a new substance tarnish to make a whole new chemical.

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A globe is placed on your desk and you are asked to identify its physical properties. How would you describe the globe?
gogolik [260]
You could describe it's shape, color, varieties on sizes and shape of states, how it's rounded but with a top and bottom.
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4 years ago
How many moles of sulfuric acid (H2SO4) are needed to react completely with 6.8 moles of lithium hydroxide (LiOH)? (4 points) 2L
Keith_Richards [23]

Answer:

3.4 mol H2SO4

Explanation:

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3 years ago
Chemical and physical element properties are determined by their valence electrons. How do you describe metals with only one val
Y_Kistochka [10]

Answer:

B

Explanation:

7 0
3 years ago
A student creates a scale model of planets where 1 centimeter (cm) is equal to 10,000 kilometers (km). In this model, which plan
Arlecino [84]

The planet that would have a diameter of approximately 12 cm is Saturn.

<h3>What is a scale model?</h3>

A scale model is a model which is used to represent another object using a given scale.

Scale models can be used to make small object bigger or larger objects smaller.

Considering the scale model of the planets where  1 centimeter (cm) is equal to 10,000 kilometers (km);

1 centimeter = 10,000 kilometers

12 centimeter = 1.2 × 10⁵ kilometers

The planet with a diameter of approximately 1.2 × 10⁵ kilometers is Saturn.

In conclusion, scale models are used to model objects.

Learn more about scale models at: brainly.com/question/17595659
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3 0
2 years ago
How many moles are in 6.21x1025 atoms of magnesium oxide?
Rasek [7]

Answer: 55.56 moles of MgO

Explanation:

1 mole = avogadro number

if 6.21x10^25 atoms then molecules of MgO (equal numbers of Mg and O atoms)

= 0.5*6.21x10^25 = 3.105 molecules of MgO

So moles of MgO = 0.5*6.21*10^25/avogadro number = 55.56

5 0
3 years ago
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