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
mina [271]
3 years ago
5

Match the correct simple with the correct elements of safety

Chemistry
1 answer:
grigory [225]3 years ago
3 0

<u>c.</u> 12. preparing data tables and gathering safety equipment

<u>b.</u> 13. reading all instructions before beginning a science lab

<u>a.</u> 14. recognizing what a picture of a hand means

<u>e.</u> 15. wiping your work area with a wet paper towel

<u>d.</u> 16. wearing goggles and an apron

You might be interested in
Neptune's Triton is being pulled closer and closer to the planet as it orbits. What will likely be a result of this gravitationa
Ksenya-84 [330]

Answer:

the planet's gravity will cause Triton to fly into Neptune

Explanation:

Gravitational force is a force of attraction between two bodies with considerable masses.

One of the mass tends to pull the other to it's center.

As the force of gravity between two bodies grow, the more massive body will be drawn to the other one.

  • The effect is that one body will eventually collide with the other.
  • Since the planet pulls very hard on its moon
  • On the long run, we can expect Triton to fly into Neptune in the foreseeable future.
3 0
3 years ago
Ibuprofen is a common pain reliever and anti-inflammatory. Its formula is C13H18O2. What percent by mass of ibuprofen is the car
Anarel [89]

Answer:

Explanation:

%Carbon =  mass of carbon / mas of C13H18O2) X100%

             =      13X12/ (13X12+18+2X16)X100%

           =    156/206) X100%= 75.7%

8 0
2 years ago
g When 2.50 g of methane (CH4) burns in oxygen, 125 kJ of heat is produced. What is the enthalpy of combustion (in kJ) per mole
Anna [14]

Answer:

-800 kJ/mol

Explanation:

To solve the problem, we have to express the enthalpy of combustion (ΔHc) in kJ per mole (kJ/mol).

First, we have to calculate the moles of methane (CH₄) there are in 2.50 g of substance. For this, we divide the mass into the molecular weight Mw) of CH₄:

Mw(CH₄) = 12 g/mol C + (1 g/mol H x 4) = 16 g/mol

moles CH₄ = mass CH₄/Mw(CH₄)= 2.50 g/(16 g/mol) = 0.15625 mol CH₄

Now, we divide the heat released into the moles of CH₄ to obtain the enthalpy per mole of CH₄:

ΔHc = heat/mol CH₄ = 125 kJ/(0.15625 mol) = 800 kJ/mol

Therefore, the enthalpy of combustion of methane is -800 kJ/mol (the minus sign indicated that the heat is released).

3 0
2 years ago
When pineapple juice disolve in water,it forms like what kind of mixtures.​
Digiron [165]

Explanation:

Pineapple juice often shows an unstable cloud and produces a solid precipitate that is not very attractive for consumers. Cloud stabilization by pectin addition is permitted by EU and Codex standards to counteract this effect. This additive must be labeled and its content should not exceed fixed maximum standards (Website of AIJN Code of Practice). Determination of water-soluble pectins by IFU method 26 (Website of International Fruit and Vegetable Juice Association) can be used for control of this parameter. Pectin addition to pineapple juice or juice concentrate, etc. may also be detected after its isolation by 13C isotopic analysis (Hammond, 2006) as explained later.

5 0
2 years ago
Read 2 more answers
State which statement is a physical change or a chemical change:
Oliga [24]

Answer:

Physical change: A,C ,D, F, H, I

Chemical Change: B, E, G, J, K

4 0
3 years ago
Other questions:
  • Explain how you determine the number of valence electrons that should be used in the dot structure for silicon dioxide and state
    14·1 answer
  • Help;;;;;;;;;;;;;;;;;)
    6·2 answers
  • What is the molar mass of carbon (C)?
    7·2 answers
  • Help it's science so help
    13·1 answer
  • Which is an example of a chemical reaction?
    10·1 answer
  • if the force between two charged particles increases,but the distance between them does not change, then:
    12·1 answer
  • ____causes movement of an object,whereas____is the work done ✔️ on an object in given amount of time
    12·2 answers
  • Ano ang kahalagahan ng pelikula o doyu film sa manonood​
    13·1 answer
  • A chemist must prepare of hydrochloric acid solution with a pH of at . He will do this in three steps: Fill a volumetric flask a
    10·1 answer
  • 1. What is an air mass? 2. What 2 factors characterize an air mass? 3. What determines the two characteristics of an air mass? 4
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!