CHEMISTRY HIGH SCHOOL

What interacted directly with the photographic plates to cause images in Becquerel’s experiment?A...uranium salt

B...radiation

C...unstable nuclei

D...radioisotopes

Answers

Answer 1
Answer: Answer: A. uranium salt

Becquerel made a conclusion that it was the uranium that causes the images found in the photographic plates. Though his theory was disproved during the first time,he continued to develop it. Then, it is through this experiment that Becquerel discovered radioactivity.
Answer 2
Answer:

Answer:

a on edge 2021

Explanation:

Related Questions

classify these compounds by whether they behave as strong acids, weak acids, strong bases, or weak bases in aqueous solution.
Which of the following is not an example of a chemical change?.
the mass of empty cylinder is 20 gram its mass when its filled completely with water is 30 gram and its mass when its filled completely with unknown liquid is 27 gram find the density of, the unknown liquid ​
Is standing at the top of a slide potential or kinetic energy?
What is the definition of chemistry​

Your teacher placed a drop of food coloring in a cup of water. the color slowly mixed into the water without being stirred. what does this tell you about water molecules?

Answers

Answer:

water molicules have space between them thus letting the food colour spread without stiring the water.

Fe2O3+2Al=Al2O3+2Fe A welder has 1.873 × 10^2 g Fe2O3 and 94.51 g Al in his welding kit. Which reactant will he run out of first? (options: Fe2O3 or Al.......it's Fe2O3). How much of this reactant should he order to make sure he runs out of both reactants at the same time? He should order ___g of the limiting reactant.

Answers

Answer: a) Fe_2O_3

b) 92.1 g

Explanation:

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}

a) moles of Fe_2O_3

\text{Number of moles}=(1.873* 10^2 g)/(159.69g/mol)=1.173moles

b) moles of Al

\text{Number of moles}=(94.51g)/(27g/mol)=3.500moles

Fe_2O_3+2Al\rightarrow Al_2O_3+2Fe

According to stoichiometry :

1 mole of Fe_2O_3 require 2 moles of Al

Thus 1.173 Cl_2 require=(2)/(1)* 1.173=2.346moles  of Al

Thus Fe_2O_3 is the limiting reagent as it limits the formation of product. Thus Fe_2O_3 will run out first.

Al is the excess reagent as (3.500-2.346)= 1.154 moles are left unreacted.

2 moles of Al require 1 mole of Fe_2O_3

3.500 moles of Al require= (1)/(2)* 3.500=1.750moles of Fe_2O_3

Moles of Fe_2O_3  required = (1.750-1.173) = 0.577

Mass of Fe_2O_3=moles* {\text {Molar mass}}=0.577moles* 159.69g/mol=92.1g

Thus he should order 92.1 g of the limiting reactant.

Answer:

92.41g

Explanation:

All of the following statements about electrons are true except?

Answers

A . Electrons are found in the nucleus of an atom

According to your information, it would be your answer,

Hope this helps!

Which sample is a homogeneous mixture?A) NaCI(s)
B) NaCl(aq)
C) NaCl(g)
D) NaCl(ℓ)

Answers

NaCl(aq) is a homogeneous mixture. Hence, option B is correct.

What is a mixture?

A mixture is a substance that is made up of two or more substances that are not chemically combined and in fixed proportions.  

Homogeneous mixtures are present with a similar uniform appearance and composition throughout. Examples are steel, air, salt water, etc.

Homogeneous mixtures may either be, a colloid or a solution.

An aqueous sodium chloride is a homogeneous mixture because NaCl completely dissolves in water, thus giving a single visible phase.

Hence, option B is correct.

Learn more about mixture here:  

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NaCl(aq) is a homogeneous mixture.

An aqueous sodium chloride is a homogeneous mixture because NaCl completely dissolves in water, thus giving a single visible phase.

Further Explanation

Mixture  

  • A mixture is a substance that is made up of two or more substances that are not chemically combined and in fixed proportions.  
  • A mixture may have several varying physical properties.
  • There are two types of mixture:

Homogeneous mixtures  

  • These are mixtures with a similar uniform appearance and composition throughout. Examples are, steel, air, salt water, etc.
  • Homogeneous mixtures may either be, a colloid or a solution.

Solutions  

  • Solutions are types of homogeneous mixtures containing two or more substances in a single phase.
  • Solutions contains, a solute which is the substance that dissolves in the other substance, and a solvent which is the substances that dissolves the solute.
  • For example, in a salt solution, water is the solvent and salt is the solute.

Colloid  

  • A colloid is a homogeneous solution that has an intermediate size particles between a suspension and a solution. Examples of colloids are fog and milk.  

Heterogeneous mixtures

  • This is a type of mixture that contain different substances or two or more phases of matter.
  • The components of heterogeneous mixtures are not uniform such that different samples of the mixture are not identical to each other.  
  • Examples of heterogeneous mixtures are; blood, soil, Gravel, etc.

Suspension  

  • It is a type of heterogeneous mixture made of larger particles that are visible and normally settles when the mixture is undisturbed.
  • Examples include, tomato juice, fine sand, etc.

Keywords: Mixtures, homogeneous mixture, Heterogeneous mixture

Learn more about:  

Level: High school  

Subject: Chemistry  

Topic: Mixtures and separation of mixtures  

Sub-topic: Types of mixtures  

Which of the following processes uses electrical charges to separate substances? a. Spectrophotometry b. Chromatography c. Centrifugation d. Electrophoresis

Answers

The process that uses electrical charges to separate substances is "d. Electrophoresis."

What is electrical charge?

Electrical charge is a fundamental property of matter, and it is associated with the presence of elementary particles called electrons and protons.

Electrical charge is a fundamental concept in physics and plays a crucial role in many natural phenomena, including the behavior of atoms, the operation of electrical circuits, and the functioning of electronic devices.

Electrophoresis is a technique commonly used in biology and chemistry to separate charged molecules, such as DNA, RNA, and proteins, based on their size and charge.

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Identify each of the following as either a physical change or a chemical change. Explain your answers.A. a piece of wood is sawed in half.
B. milk turns sour.
C. melted butter solidifies in the refrigerator.

Answers

A. physical
B. Chemical 
C.Physical

Answer:

A would be Physical

B would be Chemical

and C would be Physical

Explanation:

A would be physical because the wood is physically changing

B would be chemical because it's still milk but it now had clumps called curds and a very sour taste

C would be physical because the melted butter is physically changing from melted butter to solid butter.

Hope this helps.
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20 g of sugar is stirred into a beaker containing 100 g of water. After the sugar has completely dissolved, the solution is put on a scale. What is the mass of the solution?
5. Which of the following is a synthesis reaction? (2 points)2H2 + O2 → 2H2O 2H2O2 → 2H2O + O2 CaCO3 → CaO + CO2 2AgNO3 + Zn → 2Ag + Zn(NO3)2
The empirical formula for a compound is CH2. If n is a whole number, which shows a correct relationship between the molecular formula and the empirical formula? a)<br /><br /> empirical formula mass / molecular mass = n<br /><br /> B) molecular mass = element mass / empirical formula mass ´ 100<br /><br /> c) subscript of H in empirical formula = 2  subscript of H in molecular formula<br /><br /> D) subscript of C in molecular formula = n  subscript of C in empirical formula<br /><br />