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Answer:

cutting of an apple is both physical and chemical change

because cutting a apple, the size and shape of the apple changes. it will be a chemical change because after cutting an apple, the color apple changes when left open

The gas likely composed of Hydrogen

Hydrogen is one of the most abundant elements that exist in the world and its natural state is a gaseous state. This means hydrogen can be in other states such as liquid or solid if bonded with other elements but it is not its natural state.

For example:

Ice is solid and it contains both hydrogen and oxygen

Hydrochloric acid is usually liquid and it contains Chlorine and Hydrogen

Because of this, during reactions Hydrogen has a tendency to break its bonds with other elements and return to its gaseous state. Based on this, it is likely the gas in this reaction is hydrogen.

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Answer:

This is the answer but I'm sure from all answers. I hope my answer help you.

Answer: Methane is a gas at standard conditions.

Explanation: However, at low temperature and/or high pressures the gas becomes a liquid or a solid.

Answer: yes

Explanation:

Answer:

There's No Answer Im Sorry

Answer:

A pure substance has a sharp melting point (melts at one temperature) and a sharp boiling point (boils at one temperature). A mixture melts over a range of temperatures and boils over a range of temperatures. Homogeneous mixtures are called solutions.

Answer:

What is it has fixed boiling point substance or mixture? A pure substance has a sharp melting point (melts at one temperature) and a sharp boiling point (boils at one temperature). A mixture melts over a range of temperatures and boils over a range of temperatures. Homogeneous mixtures are called solutions.

Explanation:

lol they got it from go ogle

Answer:

I believe Cobalt is a Transition Metal.

Answer:

answer is transition metal

For me that is the first :

Both the identity and the properties of a substance change.

Answer:

1. organic

2. plants

3. algae?

4. oxygen

5. Uses

Answer:

Sulfur is an element is Period 3 with 6 valence electrons.

Answer:

How Radiation Affects Your Body. Radiation can damage the DNA in our cells. High doses of radiation can cause Acute Radiation Syndrome (ARS) or Cutaneous Radiation Injuries (CRI). High doses of radiation could also lead to cancer later in life.

Because radiation kills rapidly dividing cells (which is why we use it to treat fast-growing cancer cells), radiation exposure most increases the risk of cancers of rapidly dividing cells — leading to leukemia, lymphoma, breast cancer, bladder cancer, colon cancer, liver cancer, lung cancer, esophageal cancer, ovarian

Explanation:

Answer:

7.83 x 10^23 atoms

Explanation:

Answer:

4. dwarf planet

Explanation:

A

Explanation:

sodium is a chemical element with the symbol and the atomic number is 11

Answer:

A chemical reaction is a process where two different substances or elements are mixed together. They then undergo some sort of chemical change to become a different substance altogether.

Explanation:

Answer:

The answer is true. ozone in the stratosphere is a toxic pollutant that can cause tightness or shortness of breath.

THE ANSWER IS ON THE PICTURE HOPE IT HELPS

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1. The equation representing the equation is ~

[tex] \mathrm{Na + Cl\rightarrow NaCl}[/tex]

The given reaction is a redox reaction because there's a transfer of electron from Sodium (Na) to chlorine (Cl)

where sodium is oxidized (due to loss of electron) and chlorine get reduced (due to gain of electron).

2. Sodium is a highly reactive element which belongs to the 1st group of periodic table, hence it can catch fire if it is kept free in atmosphere. so in order to prevent that it is stored in kerosene oil, which doesn't let Sodium come in contact with air .

Answer:

One Barr body

Explanation:

Answer:

Pure substances made of more than one element are called. compounds. The chemical formula for a molecule of nitrogen is. N2. The balanced equation for the formation of water from the elements hydrogen and oxygen is.

Answer:

A compund

Explanation:

Did test got 100

Answer:

1s2 2s2 2p6 3s2 3p6 3d6 4s2

Explanation:

Answer:

Ocean tides are caused by the gravitational pull of the moon and the sun. The moon has the greatest effect on the tides. When the Sun, moon, and earth are in a straight line, we have Neap tides. When the Sun, moon, and earth are at right angles we have spring tides. Spring tides are especially high tides while neap tides are especially low tides.

Explanation:

brainliest please. . . <3

Answer:

C. Arrhenius

An Arrhenius base is a substance that dissociates in water to form hydroxide (OH–) ions. In other words, a base increases the concentration of OH– ions in an aqueous solution.

Explanation:

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Answer:

When ionic compounds are formed, energy is released which is exothermic energy. If the energy released during bond formation is reabsorbed, the ionic bond holding the positive ions and negative ions together will break apart which is endothermic energy.

Explanation:

The formation of an ionic crystal lattice from its constituent ions is an exothermic process.

Endothermic changes are energy changes in which energy is absorbed while exothermic energy changes are those energy changes in which energy is evolved.

During the formation of an ionic bond, the metal looses electron(s). This is an endothermic process. The nonmetal accepts electrons. This is an exothermic process.

When the ionic crystal is formed, energy is given out because the energy of the lattice is less than the energy of the isolated ions. This heat change is exothermic.

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Answer:

D is the correct option.

Explanation:

A seismograph detects seismic waves which travel through the Earth, that is mainly rock(taking from the options given)

Answer:

It is just rock!

Explanation:

Answer:

it is option A

Explanation:

Best of luck in whatever you are doing

Answer:

my answer is num:3 Hydrogen and oxygen.