1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
ollegr [7]
3 years ago
7

What tools do scientist use

Chemistry
2 answers:
Nikolay [14]3 years ago
7 0
A beaker and a microscope
Harrizon [31]3 years ago
3 0
A ruler

A calculator

Pen/Pencil/Paper

Microscope

Telescope

Binoculars

Camera

Microphone

Eyes

Ears

Mouth

Fingers

Compass

GPS

Map

MRI

CAT

Beakers

Solutes

Solvents

Acids

Bases

The internet

Human Brain

The list is ANYTHING that can be used to test and record results, then publish them for peer review.
You might be interested in
I don't get what this is asking, how would I do it?
Sedbober [7]

Answer:

57

Explanation:

57 it's a good thing I didn't get a chance

5 0
3 years ago
24. As the first five elements in Group 14 are considered in order from top to bottom, there are changes
myrzilka [38]

Answer:

B

Explanation:

As you move down the periodic table in the carbon family, the atomic radius and ionic radius increase while electronegativity and ionization energy decrease. Atom size increases moving down the group because an additional electron shell is added.

8 0
2 years ago
Using the equations
Anna [14]

Considering the Hess's Law, the enthalpy change for the reaction is 221.8 kJ/mol.

Hess's Law indicates that the enthalpy change in a chemical reaction will be the same whether it occurs in a single stage or in several stages. That is, the sum of the ∆H of each stage of the reaction will give us a value equal to the ∆H of the reaction when it occurs in a single stage.

In this case you want to calculate the enthalpy change of:

C₂H₄ (g) + 6 F₂ (g) → 2 CF₄ (g) + 4 HF (g)

which occurs in three stages.

You know the following reactions, with their corresponding enthalpies:

Equation 1: H₂ (g) + F₂ (g) → 2 HF (g)     ∆H° = -79.2 kJ/mol

Equation 2: C (s) + 2 F₂ (g) → CF₄ (g)     ∆H° = 141.3 kJ/mol

Equation 3: 2 C(s) + 2 H₂ (g) → C₂H₄ (g)     ∆H° = -97.6 kJ/mol

Because of the way formation reactions are defined, any chemical reaction can be written as a combination of formation reactions, some going forward and some going back.

<h3 /><h3>FIRST STEP</h3>

First, to obtain the enthalpy of the desired chemical reaction you need one mole of C₂H₄ (g) on reactant side and it is present in first equation. Since this equation has one mole of C₂H₄ (g) on the product side, it is necessary to locate it on the reactant side (invert it).

When an equation is inverted, the sign of ΔH° also changes.

<h3>SECOND STEP</h3>

Now, you need 2 moles of CF₄ (g) on the product side. The second equation has 1 mole of CF₄ (g) on the product side, so it is necessary to multiply it by 2 to obtain 2 moles of CF₄ (g).

Since enthalpy is an extensive property, that is, it depends on the amount of matter present, since the equation is multiply by 2, the variation of enthalpy also.

<h3>THIRD STEP</h3>

Finally, you need 4 moles of  HF (g) on the product side. The first equation has 2 moles of  HF (g) on the product side, so it is necessary to multiply it by 2 to obtain 4 moles of the compound.

Since the equation is multiply by 2, the variation of enthalpy also is multiplied by 2.

<h3>SUMMARY</h3>

In summary, you know that three equations with their corresponding enthalpies are:

Equation 1: 2 H₂ (g) + 2 F₂ (g) → 4 HF (g)     ∆H° = -158.4 kJ/mol

Equation 2: 2 C (s) + 4 F₂ (g) → 2 CF₄ (g)     ∆H° = 282.6 kJ/mol

Equation 3: C₂H₄ (g) → 2 C(s) + 2 H₂ (g)     ∆H° = 97.6 kJ/mol

Adding or canceling the reactants and products as appropriate, and adding the enthalpies algebraically, you obtain:

C₂H₄ (g) + 6 F₂ (g) → 2 CF₄ (g) + 4 HF (g)     ΔH°= 221.8 kJ/mol

Finally, the enthalpy change for the reaction is 221.8 kJ/mol.

Learn more about molar enthalpy:

  • <u>brainly.com/question/5976752?referrer=searchResults </u>
  • <u>brainly.com/question/13707449?referrer=searchResults </u>
  • <u>brainly.com/question/13707449?referrer=searchResults </u>
  • <u>brainly.com/question/6263007?referrer=searchResults </u>
  • <u>brainly.com/question/14641878?referrer=searchResults </u>
  • <u>brainly.com/question/2912965?referrer=searchResults</u>
7 0
2 years ago
For metalloids on the periodic table, how do the group number and the period number relate?
Studentka2010 [4]

Answer : The correct option is A.

Explanation :

Metalloid : Metaloids are the elements whose properties lie between the metals and non-metals.

There are six commonly elements which are boron, silicon, germanium, arsenic, antimony and tellurium. The rare elements are polonium and astatine.

The relation between the group number and period number of metalloid is that the lower the group number, the lower the period numbers and the metalloids are found in a diagonal moving down from left to right in the periodic table.

5 0
3 years ago
Read 2 more answers
How many atoms of Kr (Krypton) are in a balloon that contains 2.00 mol of Kr? (4)
Svetllana [295]

Answer:

atoms= 1.204x10^{24}atoms

Explanation:

Hello!

In this case, according to the Avogadro's number, it is possible to compute the atoms of Kr in 2.00 moles as shown below:

atoms=2.00mol*\frac{6.022x10^{23}atoms}{1mol} \\\\atoms= 1.204x10^{24}atoms

Best regards!

4 0
2 years ago
Other questions:
  • Electrcity cannot pass through a/an
    9·1 answer
  • Which state of matter characterized by having a definite shape and a definite volume?
    9·1 answer
  • A litter of pigs is born. Three are female, and three are male. Which set of symbols correctly describes the gender of each pigl
    12·2 answers
  • What is more inflammable? gasoline or ethanol?
    6·1 answer
  • Do all elements do this or are there exceptions?
    9·1 answer
  • A sample of helium gas at a pressure of 0.538 atm and a temperature of 256 °C, occupies a volume of 437 mL. If the gas is cooled
    7·1 answer
  • Zinc-64 undergoes beta decay as shown:
    12·1 answer
  • How many oxygen atoms were used to write Felicia’s name?
    9·1 answer
  • What is the concentration of a solution with a volume of .45 L that contains .9 moles of Iron (II) chloride?
    8·1 answer
  • Helppppppppppppppppppppppppppp
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!