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
valkas [14]
2 years ago
10

What happens to the length of shadows as noon approaches on a sunny day?

Chemistry
2 answers:
Tems11 [23]2 years ago
5 0

Answer:

The answer is D

In-s [12.5K]2 years ago
4 0

Answer:

Almost posotive its A

Explanation:

You might be interested in
What istope of an atom if it has 29 protons and 36 neutrons?<br>​
Lunna [17]

Answer:

Copper Atoms

Explanation:

All copper atoms have atomic number 29: all their nuclei contain 29 protons. But they also contain uncharged particles called neutrons. In natural copper, the atoms are of two kinds. One has 29 protons and 34 neutrons in the nucleus; the other has 29 protons and 36 neutrons

5 0
3 years ago
What effects do catalysts have on chemical reactions?
cupoosta [38]

Answer:

3

Explanation:

8 0
2 years ago
Which of the following pairs of reactants is not correctly listed with its product solution? A. Strong base-strong acid reactant
alexandr1967 [171]

Answer: Option B

Explanation: when strong acid react with strong base, the resulting solution is neutral as in the case of HCl and NaOH

HCl + NaOH —> NaCl + H2O

From the equation obtained, The salt ( NaCl) obtained is a normal salt which is neutral.

4 0
3 years ago
An exponent of "2" means that if we double the concentration of the reactant the rate doubles as well Exponents in rate laws are
Karo-lina-s [1.5K]

Answer:

- False.

- False.

- True.

- True.

Explanation:

Hello, for each statement we state:

- An exponent of "2" means that if we double the concentration of the reactant the rate doubles as well.

FALSE because considering a rate law like:

-r=kC^2

The exponent of "2" powers the concentration to the second power, not doubles the rate law, thus, if C is 3, for k=1, r will be -9. On the other hand if the rate is like:

-r=kC

The rate will be -3, that is why the rate is not doubled when the "2" in concentration is present.

- Exponents in rate laws are based on the coefficients from the balanced equation.

FALSE because for nonelemental chemical reactions, the exponents do not match with each species' stoichiometric coefficients in the rate law.

- The rate constant, k, takes into account the effect of activation energy and temperature on the reaction.

TRUE, since the Arrhenius equation allows us to prove the effect of the activation energy and the temperature:

k=Aexp(-\frac{Ea}{RT})

- Differential rate laws allow us to compare concentration and time.

TRUE as they are given like:

\frac{1}{\nu _A} \frac{dC_A}{dt} =\frac{1}{\nu _B} \frac{dC_B}{dt} =...

Best regards.

5 0
2 years ago
What kind of questions CANNOT be answered by chemistry?
Sergeu [11.5K]

Answer:

d. why matter exists

Explanation:

The kind of questions that chemistry CANNOT answer is "why matter exists".

In Chemistry, question of how the properties, composition and structure of substances are is answered. Also, the transformations that these substances undergo, and the energy that they release or absorbe during the transformation processes are revealed in chemistry.

Chemistry can answer the question of what forms of matter exists but cannot answer why matter actually exists.

5 0
3 years ago
Other questions:
  • Approximately how many ice cubes must melt to cool 650 milliliters of water from 29°C to 0°C? Assume that each ice cube contains
    12·1 answer
  • Pb(OH)Cl, one of the lead compounds used in ancient Egyptian cosmetics, was prepared from PbO according to the following recipe:
    5·1 answer
  • Sentence for death rate
    10·1 answer
  • I need an answer asap
    15·1 answer
  • What is the lowest unoccupied molecular orbital in F2?
    7·1 answer
  • What kind of small objects composes much of the universe
    9·1 answer
  • To compare how different types of soil absorbed water, Christian set up an experiment. He poked equal numbers and sizes of holes
    12·1 answer
  • Mercury’s natural state is where the atoms are close to each other but are still free to pass by each other. In which state(s) c
    14·2 answers
  • SCIENCE .A mover has to lift a heavy box with a pulley. Which force is the greatest to overcome in order to lift the box?
    7·1 answer
  • SO2+02➡SO3 <br>balance chemical equation​
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!