I need help for some of the question please,

Answer:

There is only 1 sig figures in 6

Explanation:

There is no 0 after it so it is considered as only 1 significant figure

Atoms are the building block of science for starters meaning that all solid and liquid thing will contain atoms. Matter is anything that has mass and takes up space. So, in order to prove that air is matter, we need to prove that air has mass and takes up space. To prove that a bicycle has matter, you would  need to show that it has a weight and will take up space.

Thank you hope this helps you out!

Answer:

The volume of mercury is 0.368mL .

Explanation:

You have to apply Density formula, D = mass/volume. Then, substitute the following values into the formula :

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

[tex]let \: density = 13.6 , mass = 5[/tex]

[tex]13.6 = \frac{5}{vol} [/tex]

[tex]13.6 \times vol = 5[/tex]

[tex]vol = 5 \div 13.6[/tex]

[tex]vol = 0.368ml \: (3sf)[/tex]

Volume of mercury metal of mass 5.00 g and density 13.6 g/ml will be

68 ml.

Density of metal can be calculated by mass per unit volume. Density of a substance is directly proportional to mass and inversely proportional with volume.

Density= mass/ volume.

Volume= density * Mass

           = 13.6g/ml * 5 g

          = 68 ml.

Density of substance is directly proportional with mass and and inversely proportional with volume. If mass of the substance increases density increases, if volume of the substance decreases then  density increase.

Therefore, Volume of mercury metal of mass 5.00 g and density 13.6 g/ml will be 68 ml.

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Answer:

three example of glocose, fructose, galactose.

Answer: Butane and benzene are both compounds. They contain multiple elements bonded together in a specific ratio. Kerosene and gasoline are mixtures because they are combinations of several compounds. Oxygen is an element because it is made up of only one type of atom.

Explanation: im doin edge 2020

Butane and benzene both are compounds. Gasoline and kerosene both are mixture and oxygen are an element.

A substance can not be broken into simple components by any chemical reaction is called elements.

A substance is from a combination of two or more different chemical elements is called compound.

Butane (C4H10) and benzene(C6H6) are both compounds. They contain multiple elements like carbon and hydrogen bonded together in a certain ratio.

Kerosene is a combination of hydrocarbons and basically it is made up of aromatic hydrocarbon and gasoline is a mixture of hydrocarbons, additives and blending agent so kerosene and gasoline both are mixtures.

Oxygen is an element because it is made up of only one type of atom.

Butane and benzene both are compounds. Gasoline and kerosene both are mixture and oxygen are an element.

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Answer:

5 Significant Figures

Explanation:

Answer:

Carbon is a highly covalent element due to the presence of four valence electrons in its outermost shell. This helps it bond covalently with other elements in various ways.

Carbon is known to be the backbone for most compounds. The carbon backbone vary in length and in the mode of bonding such as having the ability to from straight, branched, rings, double or triple bond which contibutes to the diversity and complexity of organic molecules.

Answer:

5.61983 × 10^5

Explanation:

Move the decimal forward 5 spaces, each time doing so you add 10^(# of spaces moved, in this case 5)

Answer:

4 significant figures.

Explanation:

All non-zero numbers are significant figures.

Answer: 308.649 K

Explanation:

Temperature in Celsius would be converted to Kelvin (K), which is the widely accepted S.I units for measuring Temperature in Chemistry.

Kelvin (K) = 273 + Celcius

               =  273 + 35.649 C

               =  308.649 K

Answer:

Explanation: one benefit of being organized is

More Focused

Productive

Sleeping Better

Saving Money

Healthier Physically

Social Life Improves

More Free Time

Gratitude

Less Stress

Happiness

Answer:

True

Explanation:

Answer:

The substance is a liquid.

A substance is followed by the symbol (l) in a chemical equation. The symbol represent that the substance is in the liquid state. Therefore, the correct option is option B.

Chemical equations are symbols or chemical formulas that depict a chemical reaction symbolically. With a + sign separating the entities in the reactants and products, the reactant creatures are presented on the left and the end result entities are provided on the right.

Chemical formulas can be mixed, structural (represented by pictures), or both. The absolute values for the stoichiometric numbers are shown as coefficients next to the equations and symbols of the various entities. Jean Beguin drew the initial chemical equation in 1615. A substance is followed by the symbol (l) in a chemical equation. The symbol represent that the substance is in the liquid state.

Therefore, the correct option is option B.

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Answer:

homogeneous solution

Explanation:

Hoped that helped :)

Answer:

A mixture

Explanation:

When salt dissolves in water mixture is formed.

It can be separated by evaporating then condensing the water.

Both substances retain their old property.

Hope this helps

Answer:it B,

Explanation: you make two liquids react together. Energy is being given off because light is emitted. The electrons of the liquids must be losing energy in order to produce light.

Answer:

1. active site

2. substrate.

3. activity

4. cofactor

5. complex

6. coenzyme.

Explanation:

1. A substrate binds to an enzyme at the active site where the reaction occurs.

2. In a catalyzed reaction, a reactant is often called a  substrate.

3  activity is a measure of how fast an enzyme can convert the reagent to the  product.

4. An inorganic substance necessary for the function of some enzymes is called a cofactor.

5. When properly aligned, the enzyme and substrate form an enzyme-substrate (ES) complex.

6. A small organic molecule necessary for the function of some enzymes is  called a  coenzyme.

Gases, bc its expand the most upon heating because the intermolecular space is more than in solids or liquids.

intermolecular space = the space between each particles

Gases

the intermolecular space between gases is more than in solids and liquid

Answer:

25000 nanoseconds

Explanation:

Answer:

i think it's 25,000 nanoseconds :)

Explanation:

I'm really sorry but you shouldn't be asking anyone this question. I know chem is hard so you should put a little effort into the class. Save the money that you would be using to pay people and save it up as a big reward for passing chem class. Chemistry is valuable information that could help you in your future life. Please dont hate me for this. just trust me. If you put in the extra work then you will feel good about it when you pass the class. If the teacher find out that you cheated, it would probably go on your permanent record. Hope this helps

Answer: yo i’m down :)

Explanation:

Answer:

The answer to this is simple.  

There is a school of thought that believes that natural fires are necessary.

Explanation

They are required to reduce the density of the forests that are so thick that when they eventually burn, the effects are usually catastrophic. According to one source, some of these forests are over a hundred years old. When eventually these kinds of forests catch fire, they become very hard to manage and the destruction the leave are usually worse off than if they had not been allowed to so heavy and impenetrable.  

Another reason put forward by this school of thought is that the countries who own these forests have politicised wildfires using them as an excuse to attract international funding/assistance because the fires are depleting the worlds protective greenery/earth biggest natural oxygen factory.

Cheers!

Answer:

[tex]\frac{6}{3} Li^{-}[/tex]

Explanation:

The number of protons and neutrons together create total atomic mass.

The number of protons determine what element it is on the Periodic Table.

The number of electrons v protons determine the charge of the atom.

Protons are positive, electrons are negative, neutrons have no charge.

Since there is 1 more electron than protons, the overall charge is going to be -1.

We are given that there are 3 protons, so that gives us the Lithium element with a -1 charge.

Add up the 3 protons with the 3 neutrons and we get 6 as the total atomic mass in this atom.

Answer: 9000 - 1 significant figure

Explanation: Since you are multiplying, the number with the least amount of significant figures determines the number of significant figures in the answer. The number 9 has 1 significant figure and 1025 and has 4 significant figures so 9 has the fewest significant figures,  meaning your answer will be 1 significant figure.

Answer: C

Explanation: A good hypothesis is an “If...then,” statement and you are looking for which tomato plant grows the best. Vitamin A is the independent variable and the height is the dependent variable.

Answer:

D) lithium

Sodium Chloride is salt which is oviously present.

Oxygen is also present because fish use their gills to get oxygen from water.

Plants are present under ocean which release Carbon dioxide.

Answer:

sound energy

Explanation:

Answer:

Chemical energy

Explanation:

your answer is 0.00833M the volume was converted into liters

NaOH(aq)+HCl(aq)→NaCl(aq)+H2O(l)

Using the molarity equation, we can find the number of moles of HCl that reacted:

molarity=mol soluteL soln

mol solute=(molarity)(L soln)

mol HCl=(0.105molL)(0.0250L)=0.00263 mol HCl

(volume converted to liters)

Now, using the coefficients of the chemical reaction, we can determine the number of moles of NaOH that reacted:

0.00263mol HCl(1lmol NaOH1mol HCl)=0.00263 mol NaOH

Lastly, we'll use the molarity equation (using given volume of NaOH soln) again to determine the molarity of the sodium hydroxide solution:

molarity=mol soluteL soln

Answer:

0.090 J/(mmol·°C) × (1000 mmol/mole × 1 kJ/(1000 J)) = 0.090 kJ/mole

Explanation:

The unit of conversion from kilo-Joules to Joules is given as follows;

1000 Joules = 1 kilo-Joule

The unit of conversion from milimoles to moles is given as follows;

1000 milimoles = 1 Mole

Therefore, we have

The value of the given expression is 0.090 J/(mmol·°C) × 1000 mmol/mole × 1 kJ/(1000 J) = 0.090 kJ/mole

0.090 J/milimole = 0.09 kJ/mole.

Answer:

It gains electrons, reducing its overall charge

Explanation:

When an element is reduced, It means It gains electrons, reducing its overall charge. Hence the correct option is (B)

Redox is a type of chemical reaction in which the oxidation states of substrate change.

Oxidation is the loss of electrons or an increase in the oxidation state (Charge) of a chemical or atoms within it.

Reduction is the gain of electrons or a decrease in the oxidation state (Charge) of a chemical or atoms within it.

Therefore, When an element is reduced, It means It gains electrons, reducing its overall charge. Hence the correct option is (B)

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