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3 years ago

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Water contracts as it freezes at 0°C. Solid ice is less dense than liquid water. Liquid water expands with increasing temperatur

e between 0°C and 4°C. Liquid water expands with increasing temperature above 4°C.

1 answer:

Mariulka [41]3 years ago

6 0

Answer:

Explanation:no when water frezzing it will expand and when it weams up it shunkes

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Give the chemical symbol of an element in the third period (row) of the periodic table with four 3p electrons.

Ann [662]

<u>Answer: </u>The chemical symbol of the element is Sulfur.

<u>Explanation:</u>

The element which is present in third period of the periodic table having four 3p electrons is Sulfur. Sulfur is the 16th element of the periodic table which has 6 valance electrons.

The electronic configuration of this element is: $[Ne]3s^23p^4$

This element is considered as a non-metal because it will accept electrons in order to attain stable electronic configuration.

Hence, the chemical symbol of the element is Sulfur.

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3 years ago

Which of these chemical formulas kci, xe, co2, or h2- represents both an element and a molecule?

Temka [501]

An element is a substance that can not be broken into simpler parts by chemical means. Elements are made up of atoms. A molecule is the smallest particle of an element or a compound that has the same properties as the element or the compound. A molecule is made up of two or more atoms . A substance may be an element and a molecule. In this case the answer is, H2 (hydrogen gas) which is a molecule with two atoms of hydrogen and an element.

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4 years ago

Read 2 more answers

Hydrogen peroxide solution for hair bleaching is usually prepared by mixing 5.0g of hydrogen peroxide H2O2 per 100 ml of solutio

madam [21]

molarity = moles solvent/L solute

gram formula mass of H2O2: 34g/mol

5g/34g = 0.14705882352

100ml * 10^-3 = 0.1L

0.14705882352moles/0.1L = 1.47M

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4 years ago

Can a magnesium atom bond with any of these? why or why not?

MakcuM [25]

Magnesium is a metal in group 2 of the periodic table in period three with a valency of 2 and reacts by loosing electrons. Magnesium cannot react with Aluminium because both of them are metals and react by loosing electrons thus no bond would be formed between them. Neon is a noble gas with an octet configuration thus will not react with magnesium. However, Magnesium will react with chlorine which is a non metal and reacts by gaining an electron thus forming an ionic bond.

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4 years ago

Here are some data from a similar experiment, to determine the empirical formula of an oxide of tin. Calculate the empirical for

eduard

Answer:

Empirical formula of the Tin oxide sample is SnO₂

Explanation:

Tin reacts with combines with oxygen to form an oxide of tin.

Mass of crucible with cover = 19.66 g

Mass of crucible, cover, and tin sample = 22.29 g

Mass of crucible and cover and sample, after prolonged heating gives constant weight = 21.76 g

Mass of Tin oxide sample = 22.29 - 19.66 = 2.63 g

Mass of ordinary tin, after heating to breakdown the tin and oxygen = 21.76 - 19.66 = 2.1 g

Meaning that, mass of oxygen in the tin oxide sample = 2.63 - 2.1 = 0.53 g

Mass of Tin in the Tin Oxide sample = 2.1 g

Mass of Oxygen in the Tin oxide sample = 0.53 g

Convert these to number of moles

Number of moles of Tin on the Tin oxide sample = 2.1/118.71 = 0.0177

Number of moles of Oxygen in the Tin oxide sample = 0.53/16 = 0.0335

divide the number of moles by the lowest number

0.0177:0.0335

It becomes,

1:2

SnO₂

Hence, the empirical formula for the Tin oxide sample = SnO₂

7 0

4 years ago