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nexus9112 [7]
3 years ago
6

Tarnished silver can be cleaned with toothpaste. Give reason

Chemistry
1 answer:
vfiekz [6]3 years ago
6 0
Toothpaste is an abrasive that contains many things, but mainly phosphates.
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which is the best example of rotational motion? A. The wheel spins as long as the hamster keeps running. B. The tornado left a t
Tanzania [10]
I think the best example of rotational motion is : 
The wheel spins as long as the hamster keeps running
Rotational motion refer to a rotation movement in which the main axis point stays the same

hope this helps
4 0
4 years ago
Read 2 more answers
A block has a mass of 30g and dimensions of 1.5cm by 4.8cm by 2.3 cm. Will the block float or sink in
zimovet [89]

The block will sink

Explanation:

In general, an object with a higher density than water will sink  in it, and one with a lower density will float. Now, to know if the block will float or sink, the first step is to calculate the density of the block, and to do this, the volume and mass of the block are required.

Mass of the block: 30 grames

Volume of the block:

The volume of the block is not provided, but this can be found using the dimensions given.

V (Volume) = s (side) x s x s

V = 1.5 cm x 4.8 cm x 2.3 cm

V = 16.56 cm^{3}

Density of the block:

To find the density simply divide the mass into the volume

D (density) = M (Mass) ÷ V (Volume)

D = 30 grams ÷ 16.56 cm^{3}

D = 1. 811 grams/ cm^{3}

The density of the block is  1. 811 grams/ cm^{3}

Additionally, the density of the water is 1 gram/ cm^{3} or 1 gram/mL. According to this, the density of the block is higher than the density of the water, and therefore this is the block sinks.

3 0
4 years ago
How many protons, neutrons, and electrons does a magnesium atom with a mass number of 25 contain?
guapka [62]
Protons: 12
Neutrons: 13
<span>Electrons: 12</span>
4 0
3 years ago
How do you test pH levels in bottled water?
dimaraw [331]
You can use a universal indicator. The color of the universal indicator before contact with other chemicals is green, which is the pH of 7. We know that bottled water is pH 7. So when we put a few drops of universal indicator, the color would be green indicating neutral pH.
8 0
4 years ago
Which of these refers to the strength of an acid
garik1379 [7]

Mg is what you measure them in

3 0
3 years ago
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