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
Mekhanik [1.2K]
4 years ago
15

Which of the following include exact numbers?

Chemistry
2 answers:
True [87]4 years ago
6 0

Answer:

The answer is C

Explanation:

Alchen [17]4 years ago
3 0

Answer:

The correct answer is the option: (c) There are 3600 s in 1 h.

Explanation:

Hello!

Let's solve this!

We will analyze each of the options:

(a) The speed of light in a vacuum is a physical constant; to six significant figures, it is 299792 x 108 rnis: not an exact number.

(b) The density of mercury at 25'C is 13.53 g / rriL: not an exact number.

(c) There are 3600 s in 1 h: it is an exact number since in one hour there are 60 minutes and in one minute 60 seconds, so 60 * 60 = 3600s is an exact number.

(d) In 2012, the United Slates had 50 stales: not an exact number.

We conclude that the correct answer is the option: (c) There are 3600 s in 1 h.

You might be interested in
What is the acceleration of a 45 kg mass pushed with 15 N of force?​
belka [17]

Explanation:

F=ma

15=45a

15÷45=45a÷45

a=0.33m/s^2

6 0
4 years ago
A teacher mixed zinc with hydrogen chloride in a flask and quickly attached a ballon over the mouth of the flask what most likel
USPshnik [31]
Probably inflated the balloon due to the pressure created inside?
8 0
3 years ago
Give the ion symbol for the ion that has 27 protons and 24 electrons.
Natalija [7]

Answer:

Z³⁺

Explanation:

The ion symbol can be depicted as Z³⁺ .

In this atom, the number of protons is 27 and the number of electrons is 24.

Protons are the positively charged particles within an atom.

Electrons are the negatively charged particles within an atom.

 To find the charge;

   Charge  = Number of protons  - number of electrons

  Charge  = 27   - 24  = +3

The atom is positively charged and it can be depicted as Z³⁺

7 0
3 years ago
When Justin added deionized water to the volumetric flask, he accidentally filled the flask so that the water level was slightly
Igoryamba

Answer:

The actual value of density will be less than the calculated value of density

Explanation:

Density is defined as mass per unit volume. This means that the value of the density of the substance depends on both its mass and its volume.

Since the volume of the water used in the experiment is greater than the required 100mL yet a volume of 100mL was used in the calculation, the actual density of the substance is less than the calculated value of density.

4 0
3 years ago
Fructose-2,6-bisphosphate is a regulator of both glycolysis and gluconeogenesis for the phosphofructokinase reaction of glycolys
azamat

Answer: Glycolysis is stimulated by a high concentration of fructose-2,6-bisphosphate, and the gluconeogenesis is stimulated by a low concentration of fructose-2,6-bisphosphate.

Explanation: Fructose-2, 6-bisphosphate (F2, 6P) is an allosteric activator of the key enzyme in the glycolysis cycle, phosphofructokinase (PFK). F2, 6P also acts as an inhibitor of fructose bisphosphate phosphatase (FBPase) in gluconeogenesis. The concentration of F2, 6P is governed by the balance between its synthesis and breakdown, catalysed by phosphofructokinase-2 (PFK-2) and fructose-bisphosphatase-2 (FBPase-2), respectively. These enzymes are found in a dimeric protein and are controlled by a phosphorylation/dephosphorylation mechanisms. Phosphorylation of the dimeric protein results in an increased concentration of FBPase-2, leading to a decreased concentration of F2, 6P, thus activating the gluconeogenesis cycle. The concentration of PFK-2 is increased when the dephosphorylation of the dimeric protein takes place, leading to the increased concentration of F2, 6P, thus stimulating glycolysis cycle.

8 0
3 years ago
Other questions:
  • The infrared radiation traveling toward Earth is _____.
    7·2 answers
  • How many grams of silver are in 4.2 moles of silver?
    9·1 answer
  • Most water vapor enters earths atmosphere by the process of
    7·1 answer
  • Which of two factors influence the weight of an object due to gravitational pull?
    7·2 answers
  • If temperature increases from 65 degrees to 90 degrees, does the solubility increase or decrease for KBr during the same interva
    10·1 answer
  • When 15.0 g of zinc metal reacts with excess hcl, how many liters of h2 gas are produced at stp?
    8·1 answer
  • What happens to chemical energy during a chemical change
    5·1 answer
  • What is the V2O5 coefficient??
    15·1 answer
  • 43 mg = [?]g <br>A. 0.043 g <br>B. 4.3 g <br>C. 4300 g <br>D. 43,000 g​
    11·1 answer
  • 1.9x10^23 atoms of sulfur to grams of sulfur
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!