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3 years ago

HELP PLEASE WILL MARK BRAINLIEST!!!!!!!

Chemistry

1 answer:

Nat2105 [25]3 years ago

4 0

Answer:

Precise

Explanation:

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geniusboy [140]

There is only one element with atomic mass 3 and it’s lithium and it only has 3 protons and 4 neutrons

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3 years ago

List three evidences of physical and chemical change. ( If you know only one or two please write them anyways please)

LenaWriter [7]

Physical: ripping paper, braking a stick, cake batter mixing

Chemical: burning paper, spoiled milk, a penny turning green

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4 years ago

Constance has an apple that weighs 85,000 milligrams and a peach that weighs 0.15 kilograms. which fruit has the greater mass? c

Rama09 [41]

The fruit which has the greater mass is peach i.e. 150 grams.

Mass is a quantity which is used to define that what amount of substance will occupy any space or present in the given object.

We have given,

Weight of apples = 85,000 mg

Weight of peach = 0.15 kg

To compare the quantity first we have to convert both of these units in the same unit, and we know that:

In 1 kilogram = 1000 grams

And in 1 grams = 1000 milligrams

So, we convert both the units into grams as:

85,000 mg = 85,000 / 1000 = 85 grams

0.15 kg = 150 grams

So, the mass of peach is high.

Hence, peach has the greater mass.

To know more about mass, visit the below link:

brainly.com/question/15526412

4 0

2 years ago

A chemist prepares a solution of zinc nitrate Zn(NO3)2 by measuring out 78.3g of zinc nitrate into a 350ml volumetric flask and

Anvisha [2.4K]

Answer:

M = 1.18 mol/L

Explanation:

Moles is denoted by given mass divided by the molecular mass ,

Hence ,

$n = \frac{w}{n}$

n = moles ,

w = given mass ,

m = molecular mass .

From the information of the question ,

w = 78.3 g

As we known ,

molecular mass of $Zn(NO_3)_2$ is 189.36 g/mol

m = 189.36 g/mol

moles can be calculated as -

$n = \frac{w}{n}$

$n = \frac{78.3g}{189.36 g/mol}$

n = 0.413 mol

MOLARITY -

Molarity of a substance , is the number of moles present in a liter of solution .

$M=\frac{n}{V}$

M = molarity ( unit = mol / L or M )

V = volume of solution in liter ( unit = L ),

n = moles of solute ( unit = mol ),

From the question ,.

V = 350 mL

Since , 1 mL = 10⁻³ L

V = 0.350 L

n = 0.413 mol

Molarity can be calculated as -

$M=\frac{n}{V}$

$M=\frac{0.413}{0.350}$

M = 1.18 mol/L

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3 years ago

If an increase in temperature accompanies a reaction what occurred

natita [175]

Answer: A. Energy was absorbed

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4 years ago

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