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
cestrela7 [59]
3 years ago
5

1. What was the first recorded element to be discovered?

Chemistry
1 answer:
sergey [27]3 years ago
8 0

Answer:

Phosphorous

Explanation:

Although elements such as gold, silver, tin, copper, lead and mercury have been known since antiquity, the first scientific discovery of an element occurred in 1649 when Hennig Brand discovered phosphorous.

You might be interested in
4 The chemical equation below shows the reaction of sodium (Na) and chlorine (Cl) to form sodium chloride (NaCl). 2Na + Cl2 → 2N
Lubov Fominskaja [6]
I believe the correct answer is D
4 0
3 years ago
How many moles of co2 must enter the calvin cycle for the synthesis of one mole of glucose?
11111nata11111 [884]

Answer:3 moles

Explanation:

For every three molecules of CO2 that enters the Calvin cycle, one molecule of the three carbon glyceraldehyde 3-phosphate (G3P) is produced. Two molecules of G-3-P are required to produce one molecule of glucose. Therefore, the Calvin cycle needs to make a total of 6 turns to produce two molecules of G-3-P.

7 0
4 years ago
Number 1 please fast answer
Natasha2012 [34]

Answer:

I will give you 5

Explanation:

color chage, formation of a precipitate, formation of a gas, odor change, temperature change. are all signs of a chemical reaction

3 0
3 years ago
Read 2 more answers
List a possible set of four quantum numbers (n,l,ml,ms) in order, for the highest energy electron in gallium?
Elena-2011 [213]
Gallum: Z = 31

electron configuration: [Ar] 4s^2 3d10 4s2 4p1

Highest energy electron: 4p1

Quantum numbers:

n = 4, because it is the shell number
l = 1, it corresponds to type p orbital 
ml = may be -1, or 0, or +1, depending on space orientation, they correspond to px, py, pz
ms = may be -1/2 or +1/2, this is the spin number. 
7 0
3 years ago
How many moles of NaCl will react completely with 18.5 L F2 gas at 300.0 K and 1.00 atm?
meriva
Hello!

Data:

P (pressure) = 1 atm
V (volume) = 18.5 L
T (temperature) = 300 K
n (number of mols) = ? (in mol)
R (Gas constant) = 0.082 (atm*L/mol*K)

Apply the data to the Clapeyron equation (ideal gas equation), see:
P*V = n*R*T

1*18.5 = n*0.082*300

18.5 = 24.6n

24.6n = 18.5

n =  \dfrac{18.5}{24.6}

\boxed{\boxed{n \approx 0,752\:mol}}\end{array}}\qquad\checkmark

Note: If the feedback is to be considered, the closest response is 0.751 mol Nacl

_________________
_________________

I hope this helps. =)


3 0
4 years ago
Other questions:
  • Photosynthesis happens in the _____
    10·2 answers
  • Which question must be answered to complete the table below?
    7·1 answer
  • Describe the movement of electrons when the atom colors by applying ground state and excitement state?
    7·1 answer
  • is 0.0410 M−1 s −1 . We start with 0.105 mol C2F4 in a 4.00-liter container, with no C4F8 initially present. What will be the co
    9·1 answer
  • What is the charge of an electron
    6·2 answers
  • Give the correct biological term for each of the following statements
    15·1 answer
  • What is the molerity of 4grams of sodium chloride in 3.800ml solution
    10·2 answers
  • Can you describe a carbon atoms for me please<br><br> thank you
    6·1 answer
  • A sample originally contains 24 grams of a radioactive isotope. After 18 days, 18.8 grams of the isotope remain in the sample. W
    14·1 answer
  • How many molecules of SF6<br> are in 25.0 g SF6?<br><br> [ ? ]×10⁰²] molecules SF6
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!