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ch4aika [34]
3 years ago
15

What are elements 90-103 called on the periodic table?

Chemistry
1 answer:
Dominik [7]3 years ago
8 0
They're called actinoids
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Which type of reaction has will give brainliest to first correct answer
k0ka [10]

Answer:

I think it's replacement because the B and D just swap places in the end equation

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Write a chemical equation showing how this is an acid according to the Arrhenius definition. Express your answer as a balanced c
mylen [45]

Answer:

HC_2H_3O_2_{(aq)}\rightarrow H^+_{(aq)}+C_2H_3O_2^-_{(aq)}

Explanation:

Arrhenius theory:-

The Arrhenius theory was introduced introduced by Swedish scientist named Svante Arrhenius in 1887.

According to the theory, acids are the substances which dissociate in the aqueous medium to produce electrically charged atoms ( may be molecule). Out of these species furnished, one must be a proton or the hydrogen ion, H^+.

So,

The expression for acid, HC_2H_3O_2 is:-

HC_2H_3O_2_{(aq)}\rightarrow H^+_{(aq)}+C_2H_3O_2^-_{(aq)}

6 0
3 years ago
A solution is made by dissolving 42.3g of potassium hydroxide in 329g of water what is the molality of the solution?
xxMikexx [17]

Answer:

2.34 molality

Explanation:

Mole weight of KOH ( using periodic table ...rounded to 3 s.f.) =

              56.1 gm/mole

Number of moles in 43.2 g

  43.2 g  /  56.1 gm / mole =.770 mole

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7 0
1 year ago
Which of the following is an example of chemical energy being used?
AURORKA [14]

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(A) Battery in a flashlight

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Because the chemicals in the battery are being converted to light and heat energy from the bulb!

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Bond [772]

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The answer is the third option or "Yes, all of the food consumed by humans is plants or gets energy from plants, and plants produce their own food through photosynthesis." Photosynthesis is the process plants use to obtain their own food. Humans do depend on photosynthesis because not only humans eat plants, but animals. Some animals are herbivores which means they only eat plants. If plants cannot create their own food using photosynthesis, then the plant dies. Neither the human nor the animal can eat that plant.

Many animals rely on plants to eat and if all plants cannot perform photosynthesis, then the animals cannot eat. Us humans eat animals which means if the plants die, the animals who eat the plants die, and then humans die. Humans heavily rely on photosynthesis, so the answer is the third option.

Hope this helps.

6 0
2 years ago
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