Mr. Jenson's class is observing the growth of one kind of pea plant.


The class wants to design an experiment to answer the question, "What amount of water will cause the plants to produce the greatest number of peas?"

What could the class do to create the experiment?
A.
give all the pea plants the same amount of water and count the number of peas that the plants produce
B.
give all the pea plants different amounts of water and only guess the number of peas that the plants produce
C.
give all of the pea plants different amounts of water and count the number of peas that the plants produce
D.
stop watering all of the pea plants and then count the number of peas that the plants produce

Answer:

Only chemical equation uses arrow instead of = sign

Answer:

Only chemical equation uses an arrow instead of a = sign.

A chemical equation depicts a chemical reaction by utilising chemical formulae and symbols to depict the reactants, products, and chemical changes that take place. In a chemical equation, the arrow indicates the direction of the reaction and is commonly depicted as a single arrow pointing from the reactants to the products. In contrast, the equals sign (=) is commonly used in mathematical equations to indicate that two expressions have the same value.

While numbers are used to indicate the relative proportions of reactants and products and minus signs are used to indicate reactants or products in the form of ions, the arrow is the most distinguishing feature that distinguishes chemical equations from mathematical equations.

Barium is Ba. Atomic no. 56 and atomic mass =137.3.

Phosphate is naturally occurring form of phosphorus. Phosphate is P. Atomin no. 15 and atomic mass =31.0.

Answer:

The observer effect is the answer.

Answer:

When you bake a cake, the ingredients go through a chemical change. A chemical change occurs when the molecules that compose two or more substances are rearranged to form a new substance! When you start baking, you have a mixture of ingredients. The flour, egg, sugar,

Explanation:

Answer:

The mass of one mole of water molecule = 18 ×N  

A  amu

Explanation: The mass of one mole of water molecule = Mass of one molecule ×N A Also mass of one mole of water is its molar mass in grams. So the mass of one mole of water is 18 g

​

Hot spot volcano is the type of volcano which is formed at a weak spot in

the middle of a plate.

Hot spot volcano is an area in the Earth crust which is characterized by large

amount of heat flow in the area due to the volcanic activity. Hot spot  

volcano is formed at the middle of the plate as against junctures in which

other types are formed.

The weak spot is what gives rise to the unusual heat flow which makes hot

spot volcano most appropriate.

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Answer:

6.02 × 1,023

Explanation:

One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1,023 molecules of oxygen but 12.04 X 1,023 (2 X 6.02 X 1,023) atoms, because each molecule of oxygen contains two oxygen atoms.

Answer:

D. make observations to prove or disprove the hypothesis

Explanation:

Answer:

the addition of chlorine gas to a solution of potassium iodide.

The reaction that produces a colored substance is the addition of chlorine gas to a solution of potassium iodide. The correct option is D.

In a chemical reaction, reactants undergo a chemical reaction and transform into products through a chemical process. For instance, when humans breathe in oxygen, it combines with glucose to create carbon dioxide, water, and energy.

Another sign that a chemical reaction has taken place is a change in color. If two solutions are combined and a color change occurs that is not just the effect of diluting one of the reactant solutions, a reaction has taken place. A solid and a liquid combined may also result in a change in color.

Therefore, the correct option is D. The addition of chlorine gas to a solution of potassium iodide.

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Answer:

45.98 I believe if its wrong im sorry

The free energy change of the reaction; Fe (s) + Au3+ (aq) -> Fe3+ (aq) + Au (s) is calculated to be -443.83KJ/mol.

For the reaction shown in question 7, we can divide it into half equations as follows;

Oxidation half equation;

6 Al (s) -------> 6Al^3+(aq) + 18e

Reduction half equation;

3Cr2O7^2-(aq) + 42H^+(aq)   + 18e -----> 6Cr^3+(aq) + 21H2O(l)

The balanced reaction equation is;

6Al(s) + 3Cr2O7^2-(aq) + 42H^+(aq)   -----> 6Al^3+(aq) + 6Cr^3+(aq) + 21H2O(l)

The E° of this reaction is obtained from;

E° anode = -0.04 V

E°cathode = +1.50 V

E° cell = +1.50 V - (-0.04 V) = 1.54 V

Given that;

ΔG° = -nFE°cell

n = 3, F = 96500, E°cell = 1.54 V

ΔG° = -(3 × 96500 × 1.54)

ΔG° = -443.83KJ/mol

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Explanation:

5N right because -15N for left plus +20N for right = +5N

Answer:

Explanation:

1.  H2O

Lewis Dot:  

See the attachment.

Note the б+ and б- signs on the H and O atoms, respectively.  Those represent the slightly positive and slightly negative sides of the water molecule.  Those slight charges on a single water molecule are attracted to their opposite charges on neighboring H2O molecules, as shown in the graphic.  This interaction is what gives water it's cohesive properties.

3.  The property of cohesion describes the ability of water molecules to be attracted to other water molecules. which allows water to be a "sticky" liquid.

The hydrogen bonds are attractions of electrostatic force.  They arise due to the difference in charge between the slightly positive hydrogen ion and the slightly negative oxygen ion. Hydrogen bonds form between neighboring hydrogen and oxygen atoms of adjacent water molecules. The attraction between individual water molecules creates a bond known as a hydrogen bond, and it is what gives water it's cohesiveness, or ability to support water spiders, paper clips, and produces a loud noise in the event of a belly flop in a pool (including the yelp from the swimmer).

4.  I'm not sure what is being asked for the two blanks.  Water is polar and dissolves salts (ionic compounds) and hydrophilic molecules (water-loving molecules).

Answer:

Answer: Reaction Rate

Explanation:

reaction rate, in chemistry, the speed at which a chemical reaction proceeds. It is often expressed in terms of either the concentration (amount per unit volume) of a product that is formed in a unit of time or the concentration of a reactant that is consumed in a unit of time.

31

I think. Protons and electrons share the same number as well as the atomic number.

Answer:

31 protons

Explanation:

Protons are positively charged and electrons are negatively charged so if it is a neutrally charged atom (which most are) the protons and electrons will be equal.

Answer:

2.686485288205376 Explanation:

1 grams Iron(III) Oxide is equal to 0.0062622034690102 mole.

Answer:

A pH calibration is the process of adjusting your pH meter by measuring solutions of a known pH value. This is because the characteristics of your electrode will change over time and this needs to be compensated for. A calibration does this by matching your pH meter to the current characteristics of your pH sensor.

Explanation:

Answer:

The atomic number would be 12.

Explanation:

A neutral atom of Carbon-12 contains six protons, six neutrons, and six electrons.

Answer:

False, RNA is single stranded, DNA is double stranded and forms a double helix

Explanation:

There are 0.436 moles of nitrogen dioxide, NO2, present if the reaction conditions are 330 K, 2.46 atm, and 4.8 L.

The number of moles of nitrogen dioxide (NO2) in this question can be calculated by using the ideal gas law equation as follows:

PV = nRT

Where;

According to the reaction conditions given in this question;

2.46 × 4.8 = n × 0.0821 × 330

11.81 = 27.093n

n = 11.81 ÷ 27.093

n = 0.436mol

Therefore, there are 0.436 moles of nitrogen dioxide, NO2, present if the reaction conditions are 330 K, 2.46 atm, and 4.8 L.

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Answer:

I believe the answer is false

Explanation:

Earth's gravity comes from all of its mass. All the mass makes a combined gravitational pull on all the mass in an object. If you were on a planet with less mass than Earth, you would weigh less than you do here. Mass is the quantity of matter in a physical body. It is also a measure of the body's inertia, the resistance to acceleration when a net force is applied. An object's mass also determines the strength of its gravitational attraction to other bodies. Mass is not the gravitational pull on the earth.

Answer:

I got you..you need help but with which question?

Explanation:

Have a great day!

Answer: The products will be copper and oxygen.

Explanation: Copper electorde is an active electrode so it constantly takes part in the electrolysis. Cathode is a pure copper negative electrode and anode is a impure copper positive electrode. So the copper present in the solution, along with the copper present in the anode will come off and go to the cathode. As a result, cathode gains copper. And the remaining impurities settle down in the bottom.

In the anode, oxygen will be given off because according to the order of discharge, if SO4 is present then the ions will stay in the solution and oxygen will be released. So at the end, solution of SO4 and H2O will be remaining while copper and oxygen is extracted.

The half equations are-

Cathode: Cu2+ + 2e- = Cu

Anode: Cu + 2e- = Cu2+

Something you might not know: The solution in electrolysis turns blue when copper goes to the cathode. So copper electrodes are also used in electroplating.