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HACTEHA [7]
3 years ago
6

A alkaline earth metal is an element is groups 3-12 of the periodic table true or false?

Chemistry
1 answer:
Karo-lina-s [1.5K]3 years ago
5 0

False Alkaline earth metals is group 2

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Ii. What is the purpose of the scientific method? (2 points)
Katena32 [7]

Explanation:

What is the purpose of the scientific method?

<em><u>ans/</u></em>

the goal of any scientific method is to solve a problem or to better understand an observed event.

b.

i. What does the law of conservation of energy say?

<em><u>ans/</u></em>

The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another.

ii. List two different kinds of energy.

<em><u>ans/</u></em>

Potential energy.

Kinetic energy.

iii. What does the law say about changes energy can undergo?

<em><u>ans/</u></em>

The implication of the Law of Conservation of Energy is that for any energy conversion, if a certain type, or form, of energy gets reduced by a certain amount, then another type of energy must increase by the same amount.

6 0
3 years ago
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In a combustion reaction, ethanol (C2H5OH) is burned in the presence of oxygen (O2), producing carbon dioxide (CO2) and water (H
charle [14.2K]
Answer:
Reactants: Ethanol (C₅H₅OH), Oxygen (O₂)

Products: Carbon dioxide (CO₂) and Water (H₂O)

Explanation:
Let’s rewrite each part of the described situation in chemical equation terms.

Ethanol - C₂H₅OH
is burned in the prescence of - +
oxygen - O₂
producing - →
carbon dioxide - CO₂
and - +
water - H₂O

Chemical equation:
C₂H₅OH + O₂ → CO₂ + H₂O

The terms on the left side of a chemical equation are reactants, and the terms on the right side of a chemical equation are products.

Therefore, since we know this, ethanol (C₂H₅OH) & oxygen (O₂) are the reactants, and carbon dioxide (CO₂) & water (H₂O) are the products.
8 0
3 years ago
The scientific method is great, but how do you think we answer the questions which cannot be tested with an experiment?
umka2103 [35]

Answer:

We do something called hypothesis

3 0
3 years ago
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As fuel is burned in an airplane, it seems to disappear from the tank, suggesting that matter is destroyed during the reaction.
gregori [183]

Answer:

Well we know that matter is neither created nor destroyed by chemical reactions or physical transformations. It is not destroyed it simply was converted to gas. =D

6 0
3 years ago
What is the IMA of the 1 st class lever in the graphic given?<br><br> 2<br> 3<br> 0.5
Zina [86]

Answer:

I believe the answer isT 2.

Explanation:

he formula for IMA of a first-class lever is effort-distance/resistance-distance.

6 0
3 years ago
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