A human is an example of a(n)
A) element
B) compound
C) homogeneous mixture
D) heterogeneous mixture

Explanation:

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Answer: 6, 7 and 6 significant figures, respectively.

Explanation:

A.  67.20 x  8.02 = 538.944, has  6 significant figures  .

B. 486.02 x 0.056 = 27.21712, has 7 significant figures .

C. 11.264 + 245.3 =  256.564 = 6 significant figures.

Answer: C

Explanation: Because I just did the test lol.

Chemicals are substances that can be natural or man-made. It can both hurt and help the environment as they pollute water and can also clean water. Thus, option C is correct.

Chemicals are compounds that are synthesized artificially and have various uses and applications in various fields. They can be both beneficial and detrimental to the environment and the ecosystem.

Chemicals like that from factories, pesticides run-off from agricultural fields, drugs, microorganisms, fertilizers, radioactive substances, etc, cause water pollution by acting as contaminants.

On the contrary, chemicals can be used to clean water pollution. Chloramine and chlorine are the most common chemical disinfectants that cleanse contaminated water to make it useful.

Therefore, option C. chemicals can both clean and pollute water.

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Answer:

Particles exchange energy through elastic collisions.  

All particles are in constant random motion.

Except during collisions, interactions between particles are negligible.

Temperature depends only on the average kinetic energy of the particles.

Explanation:

Answer:

A,B,D,E egd

Explanation:

Answer:

Physical changes

Explanation:

Changes in the state of matter are physical changes.

First, the material is made up of the same components that is was before it changed states.

The physical properties of the material changed, but its chemical composition did not, meaning that is is a physical change.

Answer:

Physical change

Explanation:

Matter can change between phases, so they are reversible physical changes that do not change matter’s chemical composition.

Changes of state are physical changes in matter. They are reversible changes that do not change matter’s chemical makeup or chemical properties. Water, for example, can be a solid (ice), a liquid (drinking water), or a gas (steam). Those are physical changes that don't change the fact that water is always chemically made up of H2O (two hydrogens and one oxygen).

Answer:

D . oxidation and reduction oxidation

The light reactions synthesize ATP, NADPH, and oxygen using oxidation and reduction. Therefore, option D is correct.

The term oxidation is defined as the loss of electron and tha term reduction is defined as the gain of electron. When oxidation and reduction takes place simultaneously is called as redox reaction.

In the light reactions, energy from sunlight drives the synthesis of ATP and NADPH, the formation of O2 from H2O.

During the light reactions, water is oxidized, electrons are shifted from water to NADP+, and ATP is compounded. The three components of the light reaction can be resumed with equations: Oxidation of water. 2 H2O 02 + 4e- + 4 H.

Thus,The light reactions synthesize ATP, NADPH, and oxygen using  oxidation and reduction, option D is correct.

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Answer:

4

Explanation:

Answer:

12.60 m has 4 significant figures.

Explanation:

On Edge 2021

Answer:A

Explanation:

Move the decimal forward 3 times.

Answer:

Density=mass / volume.

Density = 5/20.

0.25g/cm^3.

The density of the unknown object is 0.25 mL

Density of an object is defined as the mass of the object per unit volume of the object. Mathematically, it can be expressed as:

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

Mass = 5 g

Volume = 20 mL

[tex]Density = \frac{mass}{volume} \\ \\ Density = \frac{5}{20} \\ \\ Density = 0.25 \: ml[/tex]

Therefore the density of the unknown object is 0.25 mL

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Answer:

15.5 km

Explanation:

1.55x10^4m

1.55x10000m

15500m

1km=1000m

b=15500m

1km*15500m=b*1000m

1km*15500m/1000m=b*1000m/1000m

b=15.5km

Hope this helps ;) ❤❤❤

Carbon-12 (or 12C) contains six protons, six neutrons, and six electrons; therefore, it has a mass number of 12 amu (six protons and six neutrons). Carbon-14 (or 14C) contains six protons, eight neutrons, and six electrons; its atomic mass is 14 amu (six protons and eight neutrons).

Hope this helped :)

Answer:

a) gold - Solid

b) gasoline - liquid

c) oxygen - gaseous

d) olive oil - liquid

e) mercury (found in thermometers) - liquid

f) aluminum - solid

Explanation:

Matter exists in three states viz: solid, gas and liquid. Note that, room temperature is a neither hot or cold temperature, which is about 20-23°C.

A) Gold is a transition metal with the symbol Au. At a room temperature, Gold, like most metals are found as SOLIDS.

B) Gasoline is a liquid mixture of refined hydrocarbons majorly used as fuels.

C) Oxygen is a chemical element with symbol O. It is a constituent of natural air, which is a mixture of different gases including oxygen. Hence, at room temperature, Oxygen is a gas.

D) Olive oil is a vegetable oil got from olives. It is composed of fats and it's a liquid at room temperature.

E) Mercury is an element with symbol Hg. It is the only metallic element found naturally (at room temperature) as a liquid. It is used in thermometers.

F) Aluminum is another chemical element with symbol Al. It is a lustrous metal that occurs as a Solid in room temperature.

Answer:

1.asphalat 2.DDT 3.cellulose 4.polystreyne 5.nylon

Answer: Petroleum

Explanation:

Answer:

Lactic acid is used to prepare medicine. It is colorless, can be solid or liquid form.

Explanation:

Acids are sour in taste. It changes the color and taste of the chemical. It reacts with some chemicals metals and produce the hydrogen. It react with hydrogen. I also react with the bases and produce the salt. It also promotes some of the chemical reaction. For example nitric acid, phosphoric acid sulfuric acid and the organic acids.

The lactic acid is soluble with ethanol and water. It is produced by the reaction of two strategies, the synthetic method and biotechnological methods. It is produced at very large scale by the help of fermentation. Lactic acid is colorless, in liquid or solid form. It is a weak acid and can react in the way as the stronger acids react.

Answer:

d ≈ 0.47

Explanation:

Density is represented by the ratio of mass to volume. We are given the mass (7 grams), but we need the volume.

The volume can be calculated by subtracting the new volume from the old volume.

25 mL - 10 mL = 15 mL

The volume is 15 mL and the mass is 7 grams. Now, set up the ratio. Remember, d = m/v.

d = 7/15

d ≈ 0.47

Answer:

Yes; new substances formed, as evidenced by the color changes and bubbles. Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change

Answer..............nvm

Explanation:

Answer:

Anemometer. An anemometer is a type of weather instrument that measures wind speed.

Answer:

23.8

Explanation:

The formula for density is D=M/V, where D stands for density, M stands for mass, and V stands for volume. In this case, we are solving for mass, so we have to cross multiply the equation to isolate the variable of M. Once we cross multiply, we get the equation M=DV, and then we start to substitute the values into the equation. M=(.992g/mL)(24.0mL) is the equation, and once we multiply, we get 23.808 as the answer. But when figuring out density, mass, or volume, we need to utilize sig figs. Since the two numbers that you are multiplying both have 3 sig figs, the answer must have three sig figs. Round up or down based on the place value that you are rounding to. Since we are trying to get an answer that is in the tenths place, we round down to 23.8, which is the answer.

Explanation:

Sugar will readily dissolve in water but doesn't form cations and anions in solution. That is, there are no charge carriers formed. Substances that only partially ionize into ions when dissolved in water are called weak electrolytes.

I hope it help:)

Answer:

Dissolving sugar is a physical change. It is not a chemical change. So, ions will not be formed.

Answer:D

Explanation:

Move the decimal forward 2 times.

Answer:

I think the answer could be 13 i hope this helps

Answer:

They have high melting points . They have ionic

giant lattice structures : strong force of attraction between inland so have high melting points . They are iconic because of large electronegativity differences between the metal and oxygen ....Aluminum oxide (Al203) is ionic but does show some covalent character.

Answer:

2300J

Explanation:

1 kilojoule is 1000joules so to get how much is 2.3 multiply it with 1000

Answer:

physical is the change that doesn't effect the identity of the object chemical changes the identity of the object.

Answer:

True

Explanation:

This is true because every chemical reacts differently