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3 years ago

What are three elements in the same period

Chemistry

1 answer:

ExtremeBDS [4]3 years ago

6 0

Explanation:

lithium hydrogen sodium oxygen

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How many grams of potassium bromide are there in 0.627 moles

miskamm [114]

Answer:

7.508 Moles Vangkee

Explanation:

semoga membantu ya vangkee

5 0

3 years ago

Read 2 more answers

In a 1 m solution of n2h4(aq), identify the relative molar amounts of these species.

Damm [24]

The question needs:

In a 1 M solution of N₂H₄(aq), identify the relative molar amounts of these species. from most to least...

H₂O N₂H₅⁺~OH⁻ H₃O⁺ N₂H₄

H₂O is most

second N₂H₄

N₂H₅ and OH⁻ present in equal amount

H₃O⁺ is zero

because N₂H₄ is weak base it partially ionizes in water as following:

N₂H₄ + H₂O ⇄ N₂H₅⁺ + OH⁻

5 0

3 years ago

A constant-volume calorimeter was calibrated by carrying out a reaction known to release 3.50 kJ of heat in 0.200 L of solution

Dmitrij [34]

Answer:

The change in internal energy is - 1.19 kJ

Explanation:

Step 1: Data given

Heat released = 3.5 kJ

Volume calorimeter = 0.200 L

Heat release results in a 7.32 °C

Temperature rise for the next experiment = 2.49 °C

Step 2: Calculate Ccalorimeter

Qcal = ccal * ΔT ⇒ 3.50 kJ = Ccal *7.32 °C

Ccal = 3.50 kJ /7.32 °C = 0.478 kJ/°C

Step 3: Calculate energy released

Qcal = 0.478 kJ/°C *2.49 °C = 1.19 kJ

Step 4: Calculate change in internal energy

ΔU = Q + W W = 0 (no expansion)

Qreac = -Qcal = - 1.19 kJ

ΔU = - 1.19 kJ

The change in internal energy is - 1.19 kJ

4 0

4 years ago

An object has a mass of 20 g and displaces a volume of 5 mL. What is the object's density?

lara [203]

Hey There!:

The density is the quotient between the mass of a material and the volume occupied by it, The density can be expressed for a substance or for a mixture of substances. For example, water density in ambient conditions is equal to 1.00 g/cm3, which means that in 1 cm³ or 1 mL, there are 1.0 g of water. Therefore:

D = m / V

D = 20 g / 5 mL

D = 4,0 g/mL

hope that helps!

5 0

3 years ago

On lab day. Milania did an experiment with two solids: potassium iodide and silver nitrate. Milania measured and recorded the ma

Mkey [24]

D. It is a chemical change because solubility in water of Solid A is different than the solubility in water or both Potassium Iodide and Silver Nitrate

Explanation:

From the given table which summarizes findings about the experiment, we can conclude that It is a chemical change because solubility in water of Solid A is different than the solubility in water of both Potassium Iodide and Silver Nitrate.

A chemical change is a form of change in which new substances are produced.
A physical change is one in which the states of matter changes especially the form.

Now we that two soluble substances goes to insoluble product.

A substance is soluble when they go into solution with a solvent of the same type.
This change from solubility to insolubility of a compound is a typical chemical change.
Other forms of changes are just physical changes.

learn more:

Chemical change brainly.com/question/9388643

#learnwithBrainly

5 0

3 years ago