A student wants to investigate competition between two organisms. For the investigation, it
is most important that the student should choose organisms that
O require the same resources.
O reproduce at the same rate.
O are both active during the day.
o have the same adaptations.

(help please!!! due today!!!)

Answer:

D. All of the above

Explanation:

Molecules, ions, and pure elements might be included in a chemical reaction. Therefore, option (d) is correct.

A chemical reaction can be described as a reaction that brings the chemical conversion of one chemical substance to another chemical substance. The reactions cause chemical changes that include the rearrangement of electrons in order to create and break bonds between atoms.

The compound or molecules which are primarily utilized in a reaction are called reactants. Chemical reactions give products, which possess characteristics different from the reactants of the reaction.

Chemical reactions take place at a definite rate of reaction at a given concentration, temperature, and pressure. The rate of reaction increases with the rising temperature of the reaction as more activation energy is available for reactant molcules collisions.

Therefore, in a chemical reaction reactants and products can be present as Molecules, ions, and pure elements.

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Answer:

C) He

Explanation:

Helium is one of the noble gases and contains a full valence shell. Unlike the other noble gases in Group 8, Helium only contains two valence electrons.

Answer:

Group 2 is the correct answer.

Explanation:

Chlorine has a charge -1. It means that X is +2 so that the formula is XCl2.

Answer:D

Explanation:

The metal will not react

Answer:

moles H = 2 x 0.0649=0.130

ions = 0.130 x 6.02 x 10^23=7.81 x 10^22

Explanation:

Answer:

Vascular plants are successful due to better transportation for water, nutrients and reproduction.

Explanation:

I got it right at school and hope this helps you learn to STUDY.jk

According to scientists, the evolution of pollinators made vascular plants the most successful land plants for two major reasons:

Plants with seeds, including flowering plants and conifers, produce pollen grains as a component of their reproductive process. They are often carried by wind or pollinators, such as bees, to the female reproductive organs of the same or different plant species, where they can fertilize female gametes (egg cells) and begin the development of seeds.

They carry the male gametes (sperm cells) of the plant. Many plant species depend on pollen grains for successful reproduction, and these grains have evolved a variety of forms, sizes, and surface features that make them easier to disperse and be recognized by pollinators.

Therefore, according to scientists, the evolution of pollinators made vascular plants the most successful land plants for two major reasons:

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Answer:

The epicenter

Answer:

one valence electron

Lithium has a single electron in the second principal energy level and so we say that lithium has one valence electron. Beryllium has two valence electrons.

- Lumen Learning

Answer:

one

Explanation:

because lithium is the third element with a total of 3 electrons.

Answer:

Explanation:

The density of a substance can be found by using the formula

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

From the question we have

[tex]density = \frac{12}{6} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

Should be 3

Iron, cobalt, and nickel

Answer:

Put their markers together, now they have each color

Explanation:

Answer:

They should share the colors that they are missing

Explanation:

That way, they would both have each color

Answer:

yes

Explanation:

Answer:

The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.

Answer: I'm pretty sure the answer is Number of Protons

Explanation:

I took the k-12 test

Answer:

1. 3 elements: C, H, O

2. 10

3. 4

4. 20

Explanation:

Answer:

Covalent bond

Explanation:

(pls give me brainliest) <3

Answer:

Explanation:

Both eukaryotic and prokaryotic cells have a cell membrane, which defines the limit between the environment surrounding the cell and the cell itself.

Eukaryotic cells can be either animal cells or plant cells. Plant cells, apart from the membrane, are surrounded by a cell wall that is thick and conformed by carbohydrates and peptides. This cell wall makes the cell resistant and gives it its shape. Animal cells, on the other hand, do not have cell walls, they only have the cell membrane, that regulates the entrance of nutrients and the exit of metabolic products.

Answer:

Newton's Third Law of Motion states that to every action there is an equal and opposite reaction. When the earth pushes on you to send you into the air after jumping, you also push on the earth with the same force. But forces are different from accelerations. A force F is a push or pull on an object

Explanation:

Answer:

Friction

Explanation:

Friction causes an opposite force

Answer:

c

Explanation:

Answer:

The products often have completely different properties than the reactants.

Explanation:

In a chemical reaction, the products are often completely different from the reactants.

When chemical reactions takes place, the species rearranges to form new bonds and to attain stability.

Therefore, the new products formed usually have completely different properties when compared to the reactants.

Also, in chemical reactions, mass is always conserved. The mass of the products and reactants are usually the same.

Answer:

No

Explanation:

The physical and chemical properties of substances are usually difference from those of the elements that makes them up.

Compounds are substances composed of two or more kinds of atoms joined together in a definite grouping.

The properties of a compound are distinct and different from those of the individual elements that are combined in its make-up.

Answer:

84.2 degrees

Explanation:

Olaf the snowman has an heat capacity of ice while the coffee can be

assumed to have the same heat capacity of water.

Reasons:

The heat lost by the coffee = The heat gained by Olaf...(1)

ΔQ = m₁·c₁·(T₃ - T₁) = m₂·c₂·(T₂ - T₃)

Mass of the snowman, m₁ = 38 kg

Initial temperature of the snowman, T₁ = -4.2°C

Volume of coffee, V = 15 mL = 0.000015 m³

Initial temperature of the coffee = 80.0 °C

Specific heat capacity of the snowman, c₁ = 2.097 J/(g·°C)

Specific heat capacity of the coffee, c₂ = 4.187 J/(g·°C)

Latent heat of fusion of the coffee into ice = 334 J/g

Density of the ice, ρ₂ = 997 kg/m³

Solution:

Mass of the coffee, m₂ = 0.000015 m³ × 997 kg/m³ = 0.014955 kg = 14.955 grams

Heat given to convert the coffee to ice = 334 J/g × 14.955 g = 4,994.97 J

Heat given to cool the coffee to 0°C = 14.955×4.187×80.0 = 5009.3268

Heat given to cool the coffee to 0°C = 5,009.3268 J

Heat given to reduce the temperature of the coffee turned to ice is

presented as follows;

Heat to cool frozen coffee = 14.955 × 2.108 × T₃ = 31.52514·T₃

Heat gained by Olaf = m₁·c₁·(T₃ - T₁) = 38,000× 2.097 × (T₃ - (-4.2))

Which from equation (1) gives

4,994.97 + 5009.3268 + 31.52514·T₃ = 38,000× 2.097 × (T₃ - (-4.2))

Solving with a graphing calculator, gives;

T₃ ≈ -4.08 °C

The final temperature of Olaf, T₃ ≈ -4.08 °C

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Answer:

Diversification and adaptive radiation.

Explanation:

Answer:

motion - forward

velocity - 3ft/hr

distance - 3 ft/hr

speed - 3 ft/hr

acceleration - none

displacement - ?????

Explanation:

Answer:

X represents barium - 141 nucleus.

Written as: (141, 56) Ba

Explanation:

In nuclear fission reaction, due to the fact that the process produces more neutrons, a nuclear chain reaction can possibly occurr. Now, a chain reaction is a one whereby the material that begins the reaction will also be one of the products and it can start another reaction.

Now, for the nuclear chain reaction for the fission of uranium-235, its nucleus absorbs a neutron after which it splits into a krypton - 92 nucleus and a barium - 141 nucleus. Thereafter it releases three more neutrons.

Thus, X is the image represents barium - 141 nucleus.

(141,56) Ba

Explanation:

Silver and Gold belong to a special group of metals known as the native metals. They are found naturally on their own and not in combined form in rocks.

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Answer:

salt is ionic bond and water is Polar covalent bond

Explanation: