Three wax palm trees are kept at different humidity levels inside of a greenhouse for 12 weeks. One tree is left outside in normal conditions. The height of the tree is measured once a week. Which of the following is your controlled variable?

Answer:

D.protons

Explanation:

Gold is a chemical element and it is the element 79 on the periodic table. Thus, it has an atomic number of 79. The chemical symbol for Gold is Au, it is chemically classified as a transition metal and as a solid at room temperature.

Generally, the chemical element Gold is known to be malleable, ductile and a good conductor of electricity and heat. Also, it is a non-toxic chemical element with a beautiful lustrous sheen.

Gold atoms can be identified based on the number of protons (79) because it represent its atomic number, which is what is used to differentiate an atom of an element from the atom of another chemical element.

Answer:

2(H2) + 1(O2) = 2 (H2O) is the balanced equation

Answer:

(2)H2O

(2)H2

(1)O2

Explanation:

it's not 2 1 2

or

2 1 1

Answer:

f

a

c

e

b

reactant

b

f

a

e

d

c

b

Explanation:

Answer:

According to Coulomb, the electric force for charges at rest has the following properties: Like charges repel each other; unlike charges attract. Thus, two negative charges repel one another, while a positive charge attracts a negative charge. The attraction or repulsion acts along the line between the two charges

Answer:

Explanation:

The distance covered by an object given it's velocity and time taken can be found by using the formula

distance = velocity × time

From the question we have

distance = 75 × 7.5

We have the final answer as

Hope this helps you

Answer:

The measurement is precise and accurate

Explanation:

The accuracy of a measurement of length is often indicated by how "precisely" the length measurement can be read depending on the type of measuring instrument used scale.

Looking at the measurement, we can see that the values lie between ±0.1 from the expected values hence it is accurate.

Also, the values differ from each other by ±0.1 hence it the measurements are precise.

Answer:

Accuracy:

5.5 = 98.15%

5.3 = 98.15%

5.4 = 100 %

Precision:

5.5 ± 0.14

5.3 ± 0.14

5.4 ± 0.14

Explanation:

Accuracy is determined using; 100% - % error

% error = absolute error/actual value * 100%

5.5 - 5.4/5.4 * 100% = 1.85%

accuracy = 100 % - 1.85 % = 98.15%

5.3 - 5.4/5.4 * 100 5 = 1.85%

accuracy = 100 % - 1.85 % = 98.15%

5.4 - 5.4/5.4 * 100  % = 0 %

accuracy = 100 % - 0% = 100%

Precision is determined by obtaining the standard deviation of the mean;

s = √{∑(|x - m|)²/(n - 1)}

where x is the value, m is mean of values , n is number of values

mean = (5.5 + 5.3 + 5.4) / 3 = 5.4

deviations from mean, (x - m) are as follows;

|5.5 - 5.4| = 0.1

|5.3 - 5.4| = 0.1

|5.4 - 5.4| = 0

∑(x - m)² = (0.1 + 0.1 + 0) ²= (0.2)² = 0.04

(n - 1) = 3 - 1 = 2

s = √(0.04/2)

s = ± 0.14

Therefore, the precision of each measurement is as follows;

5.5 ± 0.14

5.3 ± 0.14

5.4 ± 0.14

Answer:

The average rate is the change in concentration over a selected period of time. It depends on when you take the measurements. The instantaneous rate is the rate at a particular time.

Explanation:

Answer

Rotating

Explanation:

The Earth is always being pulled towards the Sun by gravity.

The Earth is not moving fast enough to "escape" the Sun's gravity and leave the solar system, but it is going too fast to be pulled into the Sun. Therefore, it keeps going around and around( roating)- orbiting the Sun.

Answer:

Rotating around the sun

Answer:

Sandy soil

Explanation:

Sandy soil has the greatest permeability of all soil types. It has a high amount of pore space and grain size.

Permeability is the ability of fluids to pass between the grains of a substance, here soil. It is usually a function of the size of the pore spaces and the grain size.

Permeability is very important for determining the quality of soils.

Answer:

Gas is a state of matter where particles flow freely. It has no definite shape or volume.

Explanation:

Answer:

1s22s22p63s23p6

Explanation:

The electronic configuration of K is 1s22s22p63s23p64s1.To form K+1 we remove electron. Thus the electrons configuration of K +1 is 1s22s22p63s23p6.

Hence answer is option A

Answer:

5% and NanO2 Cax[tex]x^{2}[/tex]

Answer:

B. They move freely in all directions.

Explanation:

i got it right on my test on edge

Answer:

B. They move freely in all directions.

Explanation:

Answer:

A steel cylinder contains a glass jar of sodium metal surrounded by water. All together the cylinder and its contents weigh 1000g. The cylinder is dropped which breaks the glass and shortly after popping sound is heard. Since the steel container did not break, we can assume that... *​

Explanation:

stays the same the mass and stuff dosnt change.

Answer:

the answer I am pretty sure is A

Explanation:

Because the way that a generator works is moving electric current around a wire and using magnets to make more energy. please tell me if I am wrong.

Answer: A

Explanation: Because the way that a generator works is moving electric current around a wire and using magnets to make more energy.

Answer:

A

Explanation:

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\ [/tex]

From the question

mass = 12 g

density = 19.30 g/mL

We have

[tex]volume = \frac{12}{19.30} \\ = 0.62176165...[/tex]

We have the final answer as

Hope this helps you

Answer:

A: solid and liquid

B: solid

C: gas

D: liquid and gas

E: solid

F: solid

Because the protons = the electrons so the atom will have 56 electrons.

This atom would have 56 electrons.

Atomic Structure:

So, it is given that;

Number of protons=56

Number of neutrons=58

Thus, number of electrons=56 (since, the number of protons and number of electrons are same)

Learn more:

brainly.com/question/18320794

Answer:

known as the Doctrine of Uniformity or the Uniformitarian Principle, is the assumption that the same natural laws and processes that operate in our present-day scientific observations have always operated in the universe in the past and apply everywhere in the universe.

Explanation:

Answer:

Cellulose, Coal, Natural Gas, Salt, and Crude Oil

P = 11.133 atm (purple)

T = -236.733 °C(yellow)

n = 0.174 mol(red)

Some of the laws regarding gas, can apply to ideal gas (volume expansion does not occur when the gas is heated),:  

So that the three laws can be combined into a single gas equation, the ideal gas equation  

In general, the gas equation can be written  

[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]

where  

P = pressure, atm  

V = volume, liter  

n = number of moles  

R = gas constant = 0.08206 L.atm / mol K  

T = temperature, Kelvin  

To choose the formula used, we refer to the data provided

Because the data provided are temperature, pressure, volume and moles, than we use the formula PV = nRT

T= 10 +273.15 = 373.15 K

V=5.5 L

n=2 mol

[tex]\tt P=\dfrac{nRT}{V}\\\\P=\dfrac{2\times 0.08205\times 373.15}{5.5}\\\\P=11.133~atm[/tex]

V=8.3 L

P=1.8 atm

n=5 mol

[tex]\tt T=\dfrac{PV}{nR}\\\\T=\dfrac{1.8\times 8.3}{5\times 0.08205}\\\\T=36.42~K=-236.733^oC[/tex]

T = 12 + 273.15 = 285.15 K

V=3.4 L

P=1.2 atm

[tex]\tt n=\dfrac{PV}{RT}\\\\n=\dfrac{1.2\times 3.4}{0.08205\times 285.15}\\\\n=0.174~mol[/tex]

Answer:

Creativity

Skepticism

Reasoning

Explanation:

Scientists must see a creative way to solve problems in the world. Scientists must also be skeptic about what is said, because if they were not, no one would disagree and the problems would never be solved. Reasoning is a must, as reasoning is involved in the scientific process and writing conclusions to their studies.

Hope this help!

Answer:

Balanced equations are those whose coefficients result in equal numbers of atoms for each element in the reactants and products.

Answer:

4477381.7 calories/pound

Explanation:

It is given that,

When a candle burns it produced 41,300 Joules per 1 gram.

We need to convert it into calories per pound.

We know that,

1 cal = 4.184 J

⇒ 1 J = (1/4.184) cal

1 pound = 453.592 grams

⇒1 g = (1/453.592) pounds

Now,

[tex]41300\ \text{Joules per gram}=\dfrac{41300\ \text{Joules}}{\text{gram}}\\\\=41300\times \dfrac{\dfrac{1}{4.184}\ \text{calories}}{\dfrac{1}{453.592}\ \text{gram}}\\\\=4477381.7\ \text{calories/pound}[/tex]

Hence, 41,300 Joules/gram = 4477381.7 calories/pound.

Answer:

glucose molecules that our cells need from is plants

Answer:

Cytoplasm is the semi fluid gel like substance of a cell that is present within the cellular membranes and surrounds the nucleus.

Explanation:

Hope this helps :)

Answer:

cytoplasm is correct

Explanation:

i took the test

Answer:

b Mass +1 charge 0

Explanation: protons are neutral, so neutrons do not have charge