The diagram below illustrates a chemical equation. Chemical equations can be used to model chemical changes and show how elements become rearranged during chemical reactions. Which statement about is chemical equation is true? A. Two compounds have reacted to produce one compound. B. Two elements have reacted to produce one element. C. One compound and one element have reacted to produce one compound. D. Two elements have reacted to produce one compound.

Answers

Answer 1

Answer: The correct answer is D two elements have reacted to produce one compound .

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Guys, please help me and tell me how you found the answer! If a gas has a pressure of 1.69 atm at a temperature of 300 K, what will the pressure change to if the container is cooled to 100 K? AlsoIf a gas has a pressure of 715 mm Hg at the temperature of 500 K, what will the pressure change to if the container is heated to 900 K?
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Metalloids are border of metals and non metals why

Answers

Answer:

Metalloids are called the border of metals and non metals.

Explanation:

They show some properties of metals and some properties of non metals.

Answer:

Metalloids exhibit metal and non-metal properties.

Explanation:

Some metals such as Boron and silicons and not necessarily a metal, nor are they a gas.

A hypothesis is a possible explanation or answer to a question. Hypotheses should be testable. Which of the following sentences is the best hypothesis?A.
If a person falls asleep, then their heart rate will decrease.
B.
If a pillbug becomes frightened, then it will roll up into a ball.
C.
It is better to live in a city than in the country.
D.
Why are plant leaves green?

Answers

i am caught between A. and B. but, my brain says its A.

The answer is A)

This hypothesis could be tested because it can be measured. The experiment would need a dependent and independent variable, constant and control variable.

HNO3 + H2O → H3O^+ + NO3
which ones are acids and which ones are bases

Answers

Answer:

HNO₃ and H₃O⁺ are acids

H₂O and NO₃⁻ are bases

Explanation:

The chemical equation is:

HNO₃ + H₂O → H₃O⁺ + NO₃⁻

There are several definitions of acid and bases: Arrhenius', Bronsted-Lowry's and Lewis'.

Bronsted-Lowry model defines and acid as a donor of protons, H⁺.

In the given equation HNO₃ is such substance: it releases an donates its hdyrogen to form the H₃O⁺ ion.

On the other hand, a base is a substance that accepts protons.

In the reaction shown, H₂O accepts the proton from HNO₃ to form H₃O⁺.

Thus, H₂O is a base.

In turn, on the reactant sides the substances can be classified as acids or bases.

H₃O⁺ contain an hydrogen that can be donated and form H₂O; thus, it is an acid (the conjugated acid), and NO₃⁻ can accept a proton to form HNO₃; thus it is a base (the conjugated base).

A 50-kg child on a skateboard experiences a 75-N force. What is the expected acceleration of the child?

Answers

Since the force is 75-N and the kid is 50kg then the speed will be more than equal. It will move fast, but not so fast, but if the force was higher then it will go faster.

What results from gas particles not having a strong attraction to one another?

Answers

variable volume and variable shape:)

Why does methane have a low boiling pint?

Answers

Methane is an alkane. Alkanes are composed of a number of carbons (denoted by the prefix on the chemical name, e.g. meth-ane, eth-ane, prop-ane, but-ane...) which are saturated with hydrogen atoms (the largest number of hydrogens possible are bound to them). Methane has one carbon, which is saturated with 4 hydrogen atoms - this means that the chemical formula is CH4 (where the 4 should be subscript, but I can't work it out in this text field).

The boiling point depends on the strength of the intermolecular forces between each molecule - as the length of the molecule increases, so does the force of attraction between them because there are more points to attract together. Methane has a very short chain length of only 1 carbon, so the intermolecular forces are very weak. Because the forces are weak, very little energy is required to overcome them to allow the substance to become gaseous (gas molecules spread out to fill any space, requiring a negligible strength of intermolecular forces).

Consequently the boiling point of methane is so low that it is found in gaseous form almost all of the time on Earth - however Titan, one of the moons of Saturn, has seas of methane on its surface, because it is so cold there that it is possible for methane gas to condense into liquid.

In order to consider the boiling point of a substance, we need to think about the forces holding the molecules together. Because methane (CH4) is a non-polar molecule the molecules are held together only by London Dispersion Forces which are very weak and easy to break. These bonds break when methane boils and because they are weak, it boils at a low temperature.

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The particles that make up a rock are constantly in motion. However, a rock does not visibly vibrate. Why do you think this is?

Which of the following is true for a reliable scientific source

Is boiling water a chemical reaction?

Why is an oxygen molecule more stable than and oxygen atom ?