CHEMISTRY HIGH SCHOOL

In an investigation that uses the scientific method, which step immediately follows making a hypothesis?

Answers

Answer 1
Answer: After you make a hypothesis, you then will test the hypothesis. You will test the hypothesis by testing the data that was collected and any additional data that proves that your hypothesis is correct. If your data shows that your hypothesis was not correct, you will then have to collect more data or come up with another hypothesis.

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A substance has a mass of 10 grams and a volume of 5mL. What is its density?

Answers

Answer:

The answer is

2.0 g/mL

Explanation:

The density of a substance can be found by using the formula

density = (mass)/(volume)

From the question

mass = 10 g

volume = 5 mL

The density of the substance is

density = (10)/(5)

We have the final answer as

2.0 g/mL

Hope this helps you

1 Iron can be extracted from iron(III) oxide using carbon, shown by the equation below:Fe²O³ + C -> Fe + CO
Balance the equation and state which substance is oxidised and which is reduced​

Answers

Explanation:

To balance the chemical equation for the extraction of iron from iron(III) oxide using carbon, you need to ensure that the same number of each type of atom appears on both sides of the equation. Here's the balanced equation:

2Fe₂O₃ + 3C -> 4Fe + 3CO

Now, let's determine which substance is oxidized and which is reduced:

1. Iron (Fe) undergoes a change in oxidation state from +3 in iron(III) oxide (Fe₂O₃) to 0 in elemental iron (Fe). It is reduced because it gains electrons, going from a higher positive oxidation state to zero.

2. Carbon (C) in carbon (C) undergoes a change in oxidation state from 0 to +2 in carbon monoxide (CO). Carbon is oxidized because it loses electrons and goes from an oxidation state of 0 to +2.

So, in this chemical reaction:

- Iron is reduced (it gains electrons).

- Carbon is oxidized (it loses electrons).

2MgO à 2Mg + O2 is an example of a _________ chemical reaction.a. synthesis
b. combustion
c. replacement
d. decomposition

Answers

Answer:

D. decomposition

Explanation:

Synthesis reaction occurs when two elements or compounds react to originate a new one:

A + B ⇒ C  

Combustion occurs when a fuel reacts with oxygen to form CO₂ and water:

A + O₂ ⇒ CO₂ + H₂O

Replacement reaction can be simple or double. Simple occurs when a simple element replaces others in a compound:

A + BC ⇒ B + AC

Double occurs when two compounds replace elements between them:

AB + CD ⇒ AC + BD

Decomposition reaction occurs when a compound originates two or more compounds

A ⇒ B + C

So, the reaction given is a decomposition chemical reaction.

2MgO → 2Mg + O2 is an example of a decomposition chemical reaction. The answer is letter D. It is not a replacement reaction because no other compound is involved. It is not a combustion reaction because no oxygen is involved.

At stp what element is a good conductor of electricity?

Answers

copper is a good conductor

If the Kelvin temperature of a gas is tripled and the volume if doubled, the new pressure will be ___. A. 3/2 the original pressure B. 1/6 the original pressure C. 5 times the original pressure D. 2/3 the original pressurethe answer isnt b or c

Answers

The answer is 3/2 the original pressure. The concept behind this is the ideal gas law wherein it states that Pressure (P) times volume(V) is equal to number of moles (n) times ideal gas constant (R ) times temperature (T). Since you’re trying to calculate for the pressure you use P=nRT/V. Input 3 to Temperature and 2 to volume. You’ll get a pressure of 3/2 which is 3/2 times the original pressure. 

What does newton's third law say about why momentum is conserved in collisions?A. Equal forces act in equal times, so the change in momentum for both objects must be equal.
B. Unequal forces act in unequal times, so the change in momentum for both objects must be equal.
C. Unequal forces act in unequal times, so the change in momentum for both objects must be unequal.
D. Equal forces act in unequal times, so the change in momentum for both objects must be equal.

Answers

Answer: Option (A) is the correct answer.

Explanation:

According to Newton's third law of motion, when force is exerted by one body to second body then the  second body will also exert a force equal in magnitude and opposite in direction on the first body.

For example, when we hit a wall with our leg then the wall also applies a force on our leg and thus, our leg gets hurt.

Hence, we can conclude that newton's third law says that momentum is conserved in collisions because equal forces act in equal times, so the change in momentum for both objects must be equal.
I took the test and can confirm that the answer is A.
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