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Licemer1 [7]
3 years ago
13

In order for a chemical reaction to take place, a certain amount of _____________ must be present. A. heat B. friction C. chemic

als D. energy
I NEED THE ANSWER LIKE..RIGHT NOW!!!!!!!!
Chemistry
2 answers:
ch4aika [34]3 years ago
6 0
I believe it'd be energy. 
Anna35 [415]3 years ago
3 0

The right answer is energy

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Which of these is a element: Salad, Sugar, Water, or Potassium
vovikov84 [41]

Potassium is a chemical element

Symbol: K

Atomic number: 19

Atomic mass: 39.0983 u ± 0.0001 u

Electron configuration: [Ar] 4s1

Melting point: 146.3°F (63.5°C)

3 0
3 years ago
Several tomato plants are grown indoors next to a sunny window. The plants receive water and fertilizer and remain on the window
mrs_skeptik [129]

You can see my previous answer to this very same question on brainly.com/question/11374210.


The answer is:  option D. Response to environment.


Explanation:


As explained, plants (organisms in general) respond to the stimulus provided by the environment.


Such behavior is named tropism. Tropism may be positive or negative.


When the plant's stem bends toward the window, it is showing positive phototropism, which means that the plant growth response to light such that the stems bend toward light, permiting the leaves to receive more light.


I also mention that while the plant's stems posses positive phototropism they posses negative gravitropism and the roots posses positive gravitropism.


Gravitropism is the response of the plant growth to gravity.


Stems grow away from gravity meaning that this is negative gravitropism, but roots grow toward gravity which is positive gravitropism

4 0
3 years ago
What unit do scientists use to measure atoms?
just olya [345]
Scientists use atomic mass units (amu) to measure atoms
8 0
3 years ago
A 2,000g of C-14 is left to decay radioactively. The half-life of Carbon-14 is approximately 5,700 years. What percentage of the
dsp73
Answer is: 12,6% (1/8) <span>percentage of the sample will remain.
</span>c₀ - initial amount of C-14.<span>
c - amount of C-14 remaining at time.
t = 5700</span> y.<span>
First calculate the radioactive decay rate constant λ:
λ = 0,693 ÷ t = 0,693 ÷ 5700</span> y = 0,000121 1/y = 1,21·10⁻⁴ y.
c = c₀·e∧-λ·t.
c = 2000 · e∧-(0,000121 1/y · 17100 y).
c = 252 g.
ω = 252 g ÷ 2000 g = 0,126 = 12,6%.
<span>

</span>
4 0
3 years ago
Read 2 more answers
Chemistry Questions<br>5) What is matter? Mention the characteristic of particles of matter.​
Virty [35]
Matter is everything we see and cant see and sometimes touch. Some characteristic are: solid, liquid, gas and plasma. I hope this helps :)
5 0
3 years ago
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