Answer THIS QUESTION

Answers

Answer 1

Answer:

Answer:it is 580

Explanation:

I had the answer on my quiz

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Lithium, the number-three element on the periodic table, has a mass that is twice that of hydrogen. true or false?

Answers

The correct answer is false. Lithium has a mass that is not twice that of hydrogen or any other element rather it is approximately half the mass of a carbon atom. Lithium has a mass of 6.941 g / mol while carbon has a mass of 12.01 g / mol

A radioactive isotope has a half-life of 2.5 years. Which fraction of the original mass remains unchanged after 10 years?

Answers

In ten years, four half-lives have occurred (10/2.5=4). After one half-life, 50% of the original 100% remains. After two half-lives, 50% of the remaining 50% remains (so 25% remains).
After three half-lives, 50% of the 25% remains, so 12.5% remains.
After four half-lives, 50% of the 12.5% remains, so 6.25% remains.
After four half-lives, 6.25% of the original mass remains unchanged. In fraction form that is 6.25/100

A voltaic cell spontaneously converts chemical energy to(1) electrical energy (3) mechanical energy
(2) geothermal energy (4) nuclear energy

Answers

1 - Electrical energy
A voltaic cell is an electrochemical cell that generates electricity through redox reactions.

(1) electrical energy is your answer.

A student wants to make an electromagnet. Which items are needed?magnet copper wire
copper wire, metal nail, battery
magnet, copper wire, metal nail
battery, heat source, copper wire

Answers

Answer:

copper wire, metal nail, battery

Explanation:

To create an electromagnet, the material to be magnetized (such as a metal nail) is placed inside a solenoid, the ends of the coils are connected to a circuit that includes a battery.

Current is allowed to flow for a few seconds and then cut off. The polarity of the magnet depends on the direction of flow of current in the solenoid.

Someone please help with these chemistry questions

Answers

Answer:

Option B. Add 1.46 g of NaCl to 250 mL of H₂O

Explanation:

Analyse the data given: 250 mL and 0.10 M

The molar concentration and the volume of solution can indicate the moles of solute that were used.

Let's convert the volume from mL to L → 250 mL . 1 L /1000mL =0.250L

M . volume = moles → 0.10 mol/L . 0.250L = 0.025 moles

If we convert the moles to mass, we'll know the mass of solute:

0.025 mol . 58.4 g/mol = 1.46 g

Answer:

We have to solve 1.46 grams of NaCl in 250 mL H2O (option B)

Explanation:

Step 1: Data given

Volume = 250 mL = 0.250 L

Molarity NaCl solution = 0.10 M

Molar mass of NaCl = 58.4 g/mol

Step 2: Calculate moles NaCl

Moles NaCl = molarity * volume

Moles NaCl = 0.10 M * 0.250 L

Moles NaCl = 0.025 moles

Step 3: Calculate mass NaCl

Mass NaCl = moles NaCl * molar mass NaCl

Mass NaCl = 0.025 moles * 58.4 g/mol

Mass NaCl = 1.46 grams

We have to solve 1.46 grams of NaCl in 250 mL H2O (option B)

The fuel used in many disposable lighters is liquid butane, C4H10. Butane has a molecular weight of 58.1 grams in one mole. How many carbon atoms are in 1.50 g of butane?

Answers

Doesnt the number of carbon atoms stay the same.
Though the weight of carbon in 1.5g is 1.24g.

This is because the RAM of C4 is 48.

The RFM of C4H10 is 58. Therefore, 48/58 is carbon in butane.

48/58 x 1.5 = 1.24g

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25.0 g of barium hydroxide is dissolved in 120.0g of water. What is the morality?

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