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4 years ago

Substances that cannot be broken down into simpler substances are called ____________.

2 answers:

5 0

Hello there.

<span>Substances that cannot be broken down into simpler substances are called ____________.

Answer: It is called an Element.

Hope This Helps You!
Good Luck Studying ^-^</span>

eimsori [14]4 years ago

5 0

Answer: Element

Explanation:

Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions.Example: Gold $Au$

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: carbon dioxide $CO_2$

$CO_2\rightarrow C+O_2$

Thus as it given that substances cannot be broken down into simpler substances, thus they are called elements.

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(CH3)2N2H2 + N2O4 → N2 + H2O + CO2 + heat [balance?]

Rasek [7]

<h3>Answer:</h3>

2(CH3)2N2H2 + 3N2O4 → 4N2 + 4H2O + 4CO2 + heat

<h3>Explanation:</h3>

Balancing chemical equations involves putting coefficients on reactants and products.
This results in an equal number of atoms of each element on either side of the equation.
Balancing chemical equations ensures that the law of conservation of mass is obeyed.
According to the law of conservation of mass, the mass of the reactants should be equal to the mass of products which is done by balancing chemical equations.
Putting the coefficients, 2, 3, 4, 4, 4 on the equation makes the equation balanced.
Therefore, the balanced equation would be;

2(CH3)2N2H2 + 3N2O4 → 4N2 + 4H2O + 4CO2 + heat

7 0

4 years ago

If the pKa value for a given acid is low, what does that say about the acid (is it weak or strong)?

Dmitry [639]

Answer:

If the pKa of the acid is low (negative), then the acid is strong.

Explanation:

Ka, <em>the acid ionization constant, </em>measures the strength of an acid in a solution. Stronger acids have higher Ka values.

We defined: pKa = -log[Ka]

This function is a decreasing function, meaning that pKa will be getting smaller and smaller, while increasing Ka (high values of Ka will have negative pKa values). Therefore, stronger acids (high values of Ka), will have low (negative) pKa values.

3 0

4 years ago

Identify the type of reaction and the products. Fe(NO3)2 + Na ->

Vinvika [58]

Answer:

Substitution and Na(No3) + Fe

Explanation:

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3 years ago

Water is heated to a certain temperature in a large microwavable container. If a cup is used to remove some of the water from th

Alona [7]

Answer: C

Explanation:

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2 years ago

Read 2 more answers

Iron filling's were mixed together with salt crystal's What unique property of iron would be BEST to separate the fillings from

Leto [7]

Answer:

Magnetic property

Explanation:

Iron filling is a magnetic compound, unlike the salt crystals. This means they are attracted by magnets.

To separate a mixture of iron filling s and salt crystals, a magnet should be used to remove the iron fillings from the mixture.

8 0

3 years ago