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
choli [55]
2 years ago
8

What does the word giraffe comes from

Chemistry
1 answer:
olga55 [171]2 years ago
6 0
The word giraffe comes from italian
You might be interested in
Given the thermochemical equations below, What is the standard heat of formation of CuO(s)? 2 Cu2O(s) + O2(g) ---> 4 CuO(s) ∆
OlgaM077 [116]

-130KJ is the standard heat of formation of CuO.

Explanation:

The standard heat of formation or enthalpy change can be calculated by using the formula:

standard heat of formation of reaction = standard enthalpy of formation of product - sum of enthalpy of product formation

Data given:

Cu2O(s) ---> CuO(s) + Cu(s) ∆H° = 11.3 kJ

2 Cu2O(s) + O2(g) ---> 4 CuO(s) ∆H° = -287.9 kJ

CuO + Cu ⇒ Cu2O (-11.3 KJ)      ( Formation of Cu2O)

When 1 mole Cu20 undergoes combustion 1/2 moles of oxygen is consumed.

Cu20 + 1/2 02 ⇒ 2CuO (I/2 of 238.7 KJ) or 119.35 KJ

So standard heat of formation of  formation of Cu0 as:

Cu + 1/2 02 ⇒ CuO

putting the values in the equation

ΔHf = ΔH1 + ΔH2     (ΔH1 + ΔH2  enthalapy of reactants)

heat of formation = -11.3 + (-119.35)

                            = - 130.65kJ

-130.65 KJ is the heat of formation of CuO in the given reaction.

7 0
3 years ago
Read 2 more answers
How many atoms are there in 1.3 x 10^22 molecules of N(O)2
Alex73 [517]
1 molecule of NO2 included N atom and 2 oxygen atoms, so a total of 3 atoms per molecule.

1.3 x 10^22 times 3 = 3.9 x 10^22 atoms
5 0
2 years ago
Read 2 more answers
Describe the characteristics that identify a sample of matter as being a substance.
ollegr [7]

No matter how big or little a material is, its properties remain the same. Size, form, color, and mass are the qualities that distinguish a material from non-substances. All of these qualities, including size, shape, color, and mass, can be seen and measured. Some characteristics are physical, while others are chemical. Physical characteristics include mass, volume, density, and color.  Viscosity and solubility are examples of chemical qualities.

6 0
1 year ago
Help please! I'd appreciate it 
babymother [125]

Answer:

16.56 g

Explanation:

Mass is the production of Volume and Density.

m = V. d = 6 × 2.76 = 16.56 g

6 0
3 years ago
a block of wood has a density of 0.95 g/cm3. will it float or sink when placed on a liquid with a density of 0.88 g/mL? explain
vesna_86 [32]
Since 1mL=1cm^3 the wood would sink due to it being more dense. I.e. 0.95>0.88
3 0
3 years ago
Read 2 more answers
Other questions:
  • Define atomic size, electronegativity, and ionization energy and explain how they vary at different places on the periodic table
    10·1 answer
  • Which of the following only takes into account distance and time? Question 18 options: displacement velocity speed acceleration
    12·1 answer
  • Which of the following pairs of elements would form the covalent bond with the largest dipole moment? View Available Hint(s) Whi
    9·1 answer
  • 2. List three types of chemical changes.<br><br><br><br> Help me
    7·1 answer
  • An atom that has 13 protons and 15 neutrons is an isotope of what element
    8·2 answers
  • Explain the importance of concentration as it pertains to a solution
    12·1 answer
  • 3.
    15·1 answer
  • Consider the reaction below. Which species is(are) the Brønsted-Lowry acid(s)?
    6·1 answer
  • 2. An ion is a charged particle that is formed when
    13·1 answer
  • The electron configuration can be also be represented by writing the symbol for the occupied subshell and adding a superscript t
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!