Please help me with 1,2,3,4,5,6

Answer: Mass is 2.50 g

Explanation: reaction 2 Cu + S ⇒ Cu2S

Amount of Cu = m/M = 2.00 g /63.55 g/mol= 0.03147 mol

Amount of Cu2S = 0.5 n(Cu) = 0.01574 mol

M(Cu2S)= 159.17 g/mol, m = n·M

Answer: hewo, there! your answer is Below

CH4(g) + 2O2(g) CO2(g) + 2H2O(g) + 802 kJ/mol

Explanation:

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The reaction [tex]CH_{4} (g)+2O_{2}[/tex] → [tex]CO_{2}(g) +2H2_{O} (g)+802kJ/mol[/tex]

shows combustion reaction of methane in which energy 802 KJ/mol energy produces.

A combustion reaction occurs when a substance combines with oxygen gas and produces energy in the form of light and heat. One of the reactants in combustion reactions must be oxygen. Water vapor is produced when hydrogen gas is burned.

It can be seen that this reaction give carbon di-oxide and water hence, combustion reaction will show this reaction.

[tex]CH_{4} (g)+2O_{2}[/tex] → [tex]CO_{2}(g) +2H2_{O} (g)+802kJ/mol[/tex]

the correct answer will be option (c).

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Answer:

response I believe

Explanation:

i'm pretty sure it's a response cause it's the animal responding to needing water and being thirsty

hope this helps! :)

Answer:

it is b

Explanation: As the carbon dioxide is released, calcite is precipitated or redeposited on cave walls, ceilings and floors. As the redeposited minerals build up after countless water drops, a stalactite is formed.

Explanation:

the answer is D they both increase

When ethylene glycol (an antifreeze) is added to water, the boiling point of the water increases, and the freezing point decreases.

Antifreezers are the substance which on mixes with any other compound will decreases the freezing point of that compound.

When we add ethylene glycol which is an antifreeze substance in the water then depression in freezing point takes place but at the same time elevation in boiling point also happen, because they had a great attraction force within themselves.

Hence increasing in boiling point and decreasing in freezing point takes place.

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Answer:

the answer is 5 degree

Explanation:

Answer:

Opposites

Explanation:

In positron emission, a proton is converted to a neutron by emitting a positron and a neutrino. In electron capture, an outside electron is pulled inside the nucleus and combined with a proton to make a neutron, emitting only a neutrino.

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Answer:

c

Explanation:i got it right ony my test

Answer: acetone

Explanation: Acetone has the weakest intermolecular forces, so it evaporated most quickly. Water had the strongest intermolecular forces and evaporated most slowly.

Answer:

Which are bundles of cells in the lungs that take in oxygen? Alveoli.

Explanation:

Answer option A is correct. Hope you have a great day.

Answer:5 1/2. occurred the other day i think

Explanation:

Answer:

Explanation: I don’t even know what you said

Answer:

so basically

Explanation:

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HCI + NaOH --> NaCl + H2O

Neutralization reaction is the reaction between acid and base which results in formation of salt and water. Here salt is NaCl (common salt) in above reaction.

SO, (A) H20 + NaCl is your answer.

Propanal will form silver mirror upon heating with Tollen's reagent while propanoic acid will not respond.

Answer:

Explanation: First one is Purple, purple, White.

Hairy, Hairy, Non hairy.

Answer:

Any dominant trait (capital letter) will dominate the recessive trait (lowercase letter)

Explanation:

Any letter combo with the dominant trait will have that dominant trait. The only time the recessive trait will come through is if it is a double lowercase letter. Ex. PP=purple flower Pp= Purple flower and pp= white flower

Question

The system international (SI) unit for energy is:

Answer: joule

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Answer:

Crystal structure

Explanation:

This is because minerals are organic or inorganic substances found naturally on the Earth and there are ordered substances at with atomic or molecular level. They are solid at normal Temperature. They have defined chemical composition and also have crystal structures.

Answer:

A higher taxes on corporations

Answer:

I think you mean 0.025 M and this is the answer

Explanation:

Answer:

So the total mass is 50 plus 150 grams the heat capacity 4.18 joules per gram per degree C. And the temperature change is 36 minus 25 and so we can calculate Delta H for the reaction that takes place.

Explanation:

[tex]An \:  electromagnetic \: wave can \: travel \: through \: anything \:[/tex]

[tex] - be \: it \: air, \: a \: solid \: material \: or \: vacuum. [/tex]

[tex] It \: does \: not \: need \: a \: medium \: to \: propagate \: [/tex]

[tex]or \: travel \: from \: one \: place \: to \: another[/tex]

An electromagnetic wave can travel through anything - be it air, a solid material or vacuum. It does not need a medium to propagate or travel from one place to another

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Answer:

Convert 3.5x1025 molecules of Co, to

moles,

Explanation:

Answer:

Aqua regia is a corrosive, fuming yellow solution that is a 1:3 mixture of concentrated nitric and hydrochloric acids.

Aqua regia is a mixture of hydrochloric acid (HCl) and nitric acid (HNO3) at a ratio of either 3:1 or 4:1. It is a reddish-orange or yellowish-orange fuming liquid. The term is a Latin phrase, meaning "king's water". The name reflects the ability of aqua regia to dissolve the noble metals gold, platinum, and palladium.

Answer:

I believe it will still be 4.00

Explanation:

0.714g of Helium is contained in the balloon

STP stands for standard temperature and pressure. STP refers to a specific pressure and temperature used to report on the properties of matter.

According to IUPAC( International Union of Pure and Applied Chemistry), it is defined as -

It is generally needed to test and compare physical and chemical processes where temperature and pressure plays an important role as they keep on varying from one place to another.

One mole of a gas under STP conditions occupies a volume of 22.4L.

Given,

Volume = 4L

1 mole of a gas occupies 22.4L of volume at STP.

Thus, 1L of a gas occupies = 1 / 22.4 moles

so, 4 L will occupy = 4 / 22.4 moles

                               = 0.178 moles

Moles = mass / atomic mass

Mass =  moles × atomic mass of He

             = 0.178 × 4

              = 0.714g

Therefore, 0.714g of Helium is contained in the balloon.

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Answer:

Petroleum, also called crude oil, is a fossil fuel.

petroleum was formed from the remains of ancient marine organisms, such as plants, algae, and bacteria

Petroleum products include transportation fuels, fuel oils for heating and electricity generation, asphalt and road oil, and feedstocks for making the chemicals, plastics, and synthetic materials that are in nearly everything we use

The statement " It has two carbon-carbon double bonds" is correct. because Q is a kind of unsaturated hydrocarbon.

What is unsaturated hydrocarbon?

The type of compound which contain double bond or triple bond can be considered as unsaturated hydrocarbon. Unsaturated hydrocarbon can decolorized bromine water.

Two kinds of unsaturated hydrocarbon will obtain, alkene and alkyne.

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Answer:

1 is the chemical formula for water, meaning that each of its molecules contains one oxygen and two hydrogen atoms.

2 a colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis.

3 Chemical abbreviation for sodium chloride (table salt)