3 years ago

What is the first step of the scientific method?

Chemistry

1 answer:

IgorLugansk [536]3 years ago

4 0

Answer:

I believe your answer is B) make a prediction

Explanation:

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2. Mixtures can be made of

blagie [28]

I think it’s D I could be wrong

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2 years ago

In a redox reaction, what happens to a substance’s charge when it is oxidized?

sammy [17]

I use the acronym LEO for oxidation reactions. This stand for: Lose electrons Oxidation, so when oxidation occurs, electrons are lost. Due to electrons having a negative charge, substance undergoing oxidation have a more POSITIVE charge.

Pls Thank + Branliest its good for my ego :P

7 0

3 years ago

A solid has a volume of 64 cm3. Its mass is 288 g. What is its density?

lutik1710 [3]

Answer:

I think the answer is 4500 kilogram/cubic meter

6 0

3 years ago

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You have a board, wood blocks, and a toy car. Your goal is to build a ramp that sends the car as far across the floor as possibl

lakkis [162]

Answer:

<h3>The board should be placed at about an 80-88 degrees angle. </h3>

Explanation:

This will speed the car up and increase its speed as going down the ramp.

5 0

3 years ago

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A student took a calibrated 250.0 gram mass, weighed it on a laboratory balance, and found it read 266.5 g. What was the student

marta [7]

Answer:

$\boxed{\text{6.60 \%}}$

Explanation:

$\text{Percent error} = \dfrac{\lvert \text{Measured - Actual}\lvert}{ \text{Actual}} \times100 \,\%$

$\text{\% error} = \dfrac{\lvert 266.5 - 250.0\lvert}{250.0} \times 100 \, \% = \dfrac{\lvert 16.5\lvert}{250.0} \times 100 \, \% = \dfrac{16.5}{250.0} \times 100 \,\%\\\\ = 0.0660 \times 100 \, \% = \textbf{6.60 \%}\\\text{The student's percent error is $\boxed{\textbf{6.60 \%}}$}$

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3 years ago