Which choice below would affect the rate of reaction in the opposite way from the other four? a. Cool the reaction down
b. Add a catalyst
c. Decrease the pressure
d. Use larger pieces of solid reactants
e. Decrease the concentration of the reactants

Answers

Answer 1

Answer: Adding a catalyst as this would speed up the reaction and the rest would slow it down

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A droplet of pure mercury has a density of 13.6 g/cm^3. What is the density of a sample of pure mercury that is 10 times as large as the droplet?
Copper, silver, and nickel are all classified as
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The activation energy of a chemical reaction can be decreased by the addition of(1) a catalyst (3) electrical energy (2) an indicator (4) thermal energy

Copper is an example of a(n)a. gemstone.
b. consumption resource.
c. renewable resource.
d. nonrenewable resource

Answers

copper is not a stone, copper is not a consumption resource, and copper is not renewable, that means that :

d. nonrenewable resource

Explanation:

A nonrenewable source is a source of economic value that cannot be immediately displaced by natural means on a level equal to its destruction. Most fossil fuels, such as oil, natural gas, and coal are estimated nonrenewable resources in that their use is not sustainable because their production takes billions of years.

Copper is an example of a(n) (D), nonrenewable resource which are resources that can be replenished naturally.

What is copper used for?

Copper is a nonrenewable resource because it cannot be created or replaced once it is used up. Copper is a metal that is used in a variety of products, including electrical wiring, plumbing, and jewelry.

Gemstones are naturally occurring minerals that are prized for their beauty and rarity. They are considered to be a type of nonrenewable resource, although they can be recycled.

Consumption resources are resources that are used up quickly and need to be replaced frequently. Renewable resources are resources that can be replenished naturally.

So the answer is d. nonrenewable resource.

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Which statement correctly describes the charge of the nucleus and the charge of the electron cloud of an atom?(1) The nucleus is positive and the electron cloud is positive.
(2) The nucleus is positive and the electron cloud is negative.
(3) The nucleus is negative and the electron cloud is positive.
(4) The nucleus is negative and the electron cloud is negative.

Answers

Atoms are made of nucleus and electrons. Nucleus have a positive charge due to the presence of protons and electrons are negative in charge . Thus option 2 is correct.

What is an atom?

Atoms are the basic unit every substance. Atoms combines to form molecules and compounds. An atom is made of nucleus and surrounding electrons which are revolving through a circular path of fixed energy.

Nucleus is the core of the atom and the 90% of the weight of atom is centered in the nucleus and it contains positively charged protons and neutral particles neutrons.

The nuclear model of atom was first proposed by Rutherford. He found the positive cloud of the atom and and named as nucleus. He discovered the positively charged particles protons.

The net charge of an atom is zero because all the positive charges are neutralised by equal number of negatively charged particles electrons.

Therefore, the nucleus is positive and the electron cloud is negative and option 2 is correct.

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The nucleus of an atom is positive, because it contains the protons (+1 charge) and neutrons (0 charge)
The electron cloud has a negative charge, because electrons have a -1 charge
So the answer is (2)

Which of the following best describes a mixture in which ionic compounds are dissociated in solution? a. ion solution
b. aqueous solution
c. hydraulic solution
d. hydrochloric solution

Answers

A.) Ion solution....

Which of the following sequences lists the relative sizes of particles in a water mixture from smallest to largest? a. Solutions, suspensions, colloids
b. Solutions, colloids, suspensions
c. Colloids, solutions, suspensions
d. Colloids, suspensions, solutions
e. Suspensions, colloids, solutions

Answers

mostly A., im guessing

Which element is classified as an alkali metal?
Rb
Sr
Zr
Cl

Answers

Hi there.

Alkali metals are known as the group 1 elements.

When we know this, we just have to look to group 1 of the periodic table.

Rb (Rubidium) is in group 1; it is classified as an alkali metal.

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Answer:

Explanation:

on edge

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