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klio [65]
3 years ago
11

A screw is a type of simple machine. If we look closely at a screw, we see that it is really a _________ wrapped around a centra

l core.
A) wedge
B) lever (B is incorrect)
C) fulcrum
D) inclined plane
Chemistry
2 answers:
krek1111 [17]3 years ago
5 0
I believe the answer in an inclined plane, because the ridge running along the sides run up the core. (Also, the other two answers are incorrect, so process of elimination)
fgiga [73]3 years ago
3 0
D. Inclined Plane I think but I'm not sure though
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Review energy changes by identifying the correct statements about each reaction.
Grace [21]

Answer: The reaction is exothermic

The \Delta H value is negative.

Heat is a product.

Explanation:

2H_2(g)+O_2(g)\rightarrow 2H_2O(l)+136.6kcal

Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and \Delta H for the reaction comes out to be positive.

Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and \Delta H for the reaction comes out to be negative.

The substances which are written on the left side of the arrow are reactants and the substances which are written on the right side of the arrow are products. Thus heat is a product.

5 0
3 years ago
Is CO2 a covalent or ionic bond? will give brainliest for the correct answer​
NeX [460]

Answer:

covalent bond

Explanation:

a covalent bond happens between two nonmetals

a ionic bond happens between a metal and a non metal

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carbon and oxygen are both non metals therefore CO2 is a covalent bond

4 0
2 years ago
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lesya692 [45]
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Question 4 need this answered asap (chemistry)
aleksandrvk [35]

Answer:

Conductivity meter

Explanation:

All of the other choices measure pH and can tell you when the pH changes, which is how you know the neutralization reaction has occurred. A conductivity meter does not measure pH.

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