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
Softa [21]
3 years ago
10

A group of students conducted an experiment to determine the effect of heat on the germination(sprouting) of sunflower seeds. Wh

ich of the variables listed below is the least important to control in this experiment?
a
the temperature of which the seeds are heated
b
the length of time the seeds are heated
c
the type of soil used
d
the amount of moisture in the soil
Chemistry
1 answer:
pentagon [3]3 years ago
3 0

what grade is this because apparently i like to know what grade it is before i solve it

You might be interested in
A student does a titration with 14.80 mL of 0.225M H2SO4 and 25.00 mL of unknown LiOH solution. What is the molarity of the base
Degger [83]

Answer:

The molarity of the base is 0.2664 M

Explanation:

Firstly, we write the complete and balanced titration reaction.

H_{2}SO_{4(aq)}  +    2 LiOH_{(aq)}    →   Li_{2}SO_{4(aq)}   +   2H_{2}O_{(l)}

From the reaction, we can identify that 1 mole of the acid reacted with 2 moles of the alkali (base) to yield salt and water only

We identify the following also from the question;

V_{a} = 14.80 mL  , V_{b} = 25.00 mL , C_{a} = 0.225M and C_{b} = ?

n_{a} = 1 , n_{b} = 2

We use the relation;

C_{a}V_{a}/n_{a} = C_{b} V_{b}/ n_{b}

Plugging the values, we have ;

(0.225 × 14.80)/1 = ( C_{b} × 25.00)/2

C_{b} = (2 × 0.225 × 14.80)/25

C_{b} = 0.2664 M

8 0
3 years ago
A certain shade of blue has a frequency of 7.02 × 1014 Hz. What is the energy of exactly one photon of this light?
ruslelena [56]
 <span>The energy (E) per photon is expressed by Planck's equation: E = hf, where f is 
the frequency and h is Planck's constant, experimentally determined to be 
6.625 * 10**-34 joule-seconds. So to find E, we multiply h by the frequency 
and obtain E = hf = (6.625 * 10**-34)(7.0 * 10**14) = 46.375 * 10**-20 joule 
or in standard notation, E = 4.6375 * 10**-19 joule per photon. 

Hope this answers your question.Sorry if I calculated wrong.</span>
4 0
3 years ago
Read 2 more answers
How many moles of ammonla are produced by 2.8 mol of hydrogen.<br><br>ANH​
yan [13]

Answer:

3 i think

Explanation:

6 0
2 years ago
How many milliliters of 0.500 M NaOH should be added to 10.0 g of tris hydrochloride (FM 121.135) to give a pH of 7.60 in a fina
liubo4ka [24]

Answer:

41.64mL of NaOH 0.500M must be added to obtain the desire pH

Explanation:

It is possible to find pH of a buffer by using H-H equation, thus:

pH = pka + log [A⁻] / [HA]

<em>Where [HA] is concentration of the weak acid TRIS-HCl and [A⁻] is concentration of its conjugate acid.</em>

Replacing in H-H equation:

7.60 = 8.072 + log [A⁻] / [HA]

0.3373 =  [A⁻] / [HA] <em>(1)</em>

10.0g of TRIS-HCl (Molar mass: 121.135g/mol) are:

10.0g ₓ (1mol / 121.135g) = 0.08255 moles of acid. That means moles of both the acid and conjugate base are:

[A⁻] + [HA] = 0.08255 <em>(2)</em>

Replacing (1) in (2):

0.3373 =  0.08255 - [HA] / [HA]

0.3373[HA] =  0.08255 - [HA]

1.3373[HA] = 0.08255

<em>[HA] = 0.06173 moles</em>

Thus:

[A⁻]  = 0.08255 - 0.06173 = 0.02082 moles [A⁻]

The moles of A⁻ comes from the reaction of the weak acid with NaOH, that is:

HA + NaOH → A⁻ + H₂O + K⁺

Thus, <em>you need to add 0.02082 moles of NaOH to produce 0.02082 moles of A⁻. </em>As NaOH solution is 0.500M:

0.02082 moles NaOH ₓ (1L / 0.500mol) = 0.04164L of NaOH 0.500M =

<h3>41.64mL of NaOH 0.500M must be added to obtain the desire pH</h3>

3 0
3 years ago
17. Elements in the periodic table are arranged according to their.​
iren2701 [21]
In the modern periodic table the elements are arranged in order of increasing atomic number.
7 0
3 years ago
Other questions:
  • Calculate the Ka for 0.220 M solution of H3AsO4, pH = 1.50
    5·1 answer
  • A chemistry student weighs out 0.120 g of acetic acid into a 250. mL volumetric flask and dilutes to the mark with distilled wat
    13·2 answers
  • Plant Pigments and Photosynthesis
    12·1 answer
  • Suppose an atom gains an e-. What will be the overall electrical charge? What if an atom loses one e-? 
    10·2 answers
  • El champú ¿es de naturaleza básica o acida? ¿Como puedes saberlo?
    11·1 answer
  • Hair with the follicle attached can be considered which of the following<br> types of evidence?
    13·1 answer
  • IF YOU ARE MR.BEAST FAN ANSWER THIS. What do waves transfer?
    12·2 answers
  • PLEASE HELP ME!!!!!!!!!!!!!!!!!! FILL IN THE BLANKS !!!25 POINTS AND BRAINLIEST
    8·2 answers
  • The galaxy we live in is the Milky Way galaxy, and it is a spiral galaxy. Galaxies contains billions of which of the following?
    5·1 answer
  • Which coefficients correctly balance the formula equation below? NH 4 NO 2 (s) N 2 (g)+H 2 O(l) A. 1, 2, 2 C. B. 2, 1, 2 D. 1, 2
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!