Which of these is an appropriate instrument to measure mass? balance, burette, ruler, graduated cylinder

Answers

Answer 1

Answer:

Answer: balance

Explanation:

Mass is a physical property of a body. It is the measure of resistance of acceleration that a body offers. It is also determined by the strength of gravitational attraction between two or more bodies. The SI unit of mass is the kilogram or gram.

A balance is a device which can be used to measure the accurate mass of the body. The electrical balance has a digital screen which gives the measurements in kilograms or grams in digits.

Answer 2

Answer: The answer is balance because you try to make the point hit square in the middle and you measure how much grams it has when you do hit the middle. Hope this helps.

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Which physical changes are endothermic?(1) melting and freezing
(2) melting and evaporating
(3) condensation and sublimation
(4) condensation and deposition

Answers

Melting and evaporating are endothermic.

Melting and evaporating are the physical changes that are endothermic. Therefore, the correct option is option 2.

Physical modifications are those that modify a chemical substance's shape yet do not affect its chemical content. Physical changes may normally be utilised to separate compounds to chemical elements and simpler compounds, but they cannot be utilised for separate mixtures to their individual components. When something changes physically but not chemically, it is said to have undergone a physical transformation. This contrasts to the idea of a chemical change, when a material's composition changes or a substance or substances mix or separate to generate new compounds. Melting and evaporating are the physical changes that are endothermic.

Therefore, the correct option is option 2.

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Compare the speed and space of atoms in a solid, liquid and gas.

Answers

Answer:

Decrease order of speed of atoms in solid state, liquid state and gaseous states: gas > liquid> solid

Decreasing order of space of atoms in solid state, liquid state and gaseous states: gas > liquid> solid

Explanation:

Solid state : In this state, the particles are closely packed and does not have any space between them. They have least kinetic energy due to restricted movement. This state has a definite shape and volume.

Liquid state : In this state, particles are present in random and irregular pattern. The particles are closely arranged but they can move from one place to another and thus have higher kinetic energy as compared to solids. This state has a definite volume but does not have a fixed shape.

Gaseous state : In this state, particles are loosely arranged and have a lot of space between them. They have highest kinetic energy. This state has indefinite volume as well as shape.

Decrease order of speed of atoms in solid state, liquid state and gaseous states: gas > liquid> solid

Decreasing order of space of atoms in solid state, liquid state and gaseous states: gas > liquid> solid

Atoms in a solid stay closely together and form this sort of structure in their atoms , a liquids atoms are slightly spread apart and move around more freely than the solid atoms , gas atoms move as far away as possible from each other ( moving around a lot )

What do you think will happen to the ecosystem if all the coral reefs are destroyed?

Answers

Animals that rely on coral for protection and cover, such as grouper, snapper, oysters and clams, would also be negatively impacted. And because this marine life is a vital staple in many peoples' diets, the death of the coral reefs would exacerbate the problem of feeding these groups [source: Skoloff].

Which substance is NOT a compound?a. salt
b. sodium
c. pure water
d. carbon monoxide

Answers

Among the given ones, sodium is not a compound. The correct option is b.

What is a compound?

The substance that is formed by union of different elements is referred to as a compound.

For instance, salt is made up of sodium and chloride, water have hydrogen and oxygen, etc.

Thus, the correct option is b.

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b, sodium because if you look at your periodic table it is the only element not compounded with another

Which statement best describes how a catalyst increases the rate of a reaction?(1) The catalyst provides an alternate reaction pathway with a higher activation energy.
(2) The catalyst provides an alternate reaction pathway with a lower activation energy.
(3) The catalyst provides the same reaction pathway with a higher activation energy.
(4) The catalyst provides the same reaction pathway with a lower activation energy.

Answers

A catalyst works by providing an alternate reaction pathway with a lower activation energy thus allowing more particles of the reactant to overcome the energy barrier and form product per unit of time. (OPTION 2)

If 2.27 moles of bromine react with excess phosphorus, how many moles of phosphorus tribromide will be produced

Answers

Answer:

The answer to your question is 1.51 moles of PBr₃

Explanation:

Data

moles of Br = 2.27

moles of PBr₃ = x

Balanced chemical reaction

2P + 3Br₂ ⇒ 2PBr₃

Reactant Element Products

2 P 2

6 Br 6

-Use proportions to find the answer

3 moles of Br₂ ------------------ 2 moles of PBr₃

2.27 moles of Br₂ ------------------ x

x = (2.27 x 2) / 3

x = 4.54 / 3

x = 1.51 moles

Answer:Identify one disadvantage to each of the following models of electron configuration:

Dot structures

Arrow and line diagrams

Written electron configurations

Explanation:

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The Haber process can be used to produce ammonia (NH3) from hydrogen gas (H2) and nitrogen gas (N2). The balanced equation for this process is shown below.3H2 + N2 mc025-1.jpg 2NH3 The molar mass of NH3 is 17.03 g/mol. The molar mass of H2 is 2.0158 g/mol. In a particular reaction, 0.575 g of NH3 forms. What is the mass, in grams, of H2 that must have reacted, to the correct number of significant figures? 0.1 0.102 0.10209 0.1021