CHEMISTRY HIGH SCHOOL

An object has a momentum of 5 kg m/s and a mass of 2 kg. How fast is it moving?

Answers

Answer 1

Answer:

Answer:

2.5 meter per second

Explanation:

momentum = mass multiplied by velocity

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What mass of oxygen is required to completely react with 2 moles of ch4

Answers

The balanced reaction that describes the reaction between methane and oxygen to produce water and carbon dioxide is expressed CH4 + 2 O2 = CO2 +2H2O. Hence for 2 moles of methane used, 4 moles of oxygen are needed to react completely.

!!please help asap ty only if you can ty!!!2. How many atoms of zinc are present in 0.48 mol of zinc?
(show solution)

Answers

Answer:

2.89 × 10²³ atoms of zinc

Explanation:

The number of atoms of zinc can be found by using the formula

N = n × L

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 0.48 × 6.02 × 10²³

We have the final answer as

2.89 × 10²³ atoms of zinc

Hope this helps you

Answer:

2.89× 10²³ atom

Explanation:

Given data:

Number of atoms of Zn = ?

Number of moles of Zn = 0.48 mol

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.

For example,

1 mole = 6.022 × 10²³ atom

0.48 mol × 6.022 × 10²³ atom / 1mol

2.89× 10²³ atom

The process in which a substance changes from a gaseous state to the liquid state is

Answers

The process in which a substance changes from a gaseous state to a liquid state is condensation

hope this helps!!!

Answer:

Condensation is the change of state from a gas to a liquid

Of the elements Fe, Hg, U, Te, and Y, which is considered a Group A element?

Answers

Answer:

Te is considered a Group A element.

Explanation:

Fe, Hg and Y belong to Group B.

U is a transition element.

Te is the only element that belong to Group A.

I hope I've solved your doubt.

Which two metals would react with aluminium nitrate in a displacement reaction?

Answers

Answer:

potassium and sodium

Explanation:

There are many metals that can react with aluminium nitrate in a displacement reaction. these metals are higher than aluminium in the electrochemical series of elements where metals are arranged based on their reactivity and therefore tend to displace aluminium in any chemical reaction. However the most reactive of these metals are potassium(K) and sodium(Na). Others are calcium(Ca), magnesium(Mg), lithium(Li), strontium (Sr).

what are your choices? potassium? sodium? calcium? lithium? magnesium? add your choices please

Rust on weathered rocks is caused by _____.saltation
oxidation
hydrolysis
abrasion

Answers

Rust on weathered rocks is caused by the process of oxidation. Oxidation is a process of chemical weathering that occurs when oxygen combines with minerals in rocks. rust occurs when oxygen combines with iron in rocks to form the reddish brown iron oxide.

Answer: The correct answer is oxidation.

Explanation:

Rust is a reddish-brown colored compound which is formed by the oxidation of Iron to form ferric oxide. The formula for this chemical compound is $Fe-2O_3$

Oxidation is defined as the reaction in which addition of oxygen takes place.

The reaction for the formation of rust is given by the equation, we get:

$4Fe(s)+3O_2(g)\rightarrow 2Fe_2O_3(s)$

By Stoichiometry,

4 moles of iron metal reacts with 3 moles of oxygen gas to form 2 moles of ferric oxide.

Hence, the correct answer is oxidation.

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