Help me please guys :)

Answer:

A cold surface I think.

Explanation:

Answer:

Scientific Notation was developed in order to easily represent numbers that are either very large or very small.  As you can see, it could get tedious writing out those numbers repeatedly. So, a system was developed to help represent these numbers in a way that was easy to read and understand: Scientific Notation.

Explanation:

Answer:

Working with very large or small quantities usually ends up being quite complicated. Scientific notation is a way to write numbers in an abbreviated way, making it easier to work with these numbers.

Explanation:

Answer:

CH3CH2COCl consists of three carbon atoms in the parent chain and chloroformyl group(-COCl). Therefore the name of the compound is Propanoyl chloride.

Answer:

option C is correct

Explanation:

litmus paper turns red in acidic solution and turns blue in alkaline solution and turns purple in neutral solution

Explanation:

Atoms in the equation are already in balance.

Answer:

it is d, got it right on EDG

Explanation:

Hey there!:

Mass = 17.92 g

Volume = 2.00 mL

Density =  ??

Therefore:

D = m / V

D = 17.92 / 2.00

D = 8.96 g/mL

Hope this helps!

The density of an object is obtained as the ratio of mass of an object to its volume.

In science, density is defined as mass per unit volume. The volume of an object is the same as the volume of water displaced by the object.

Since the volume of water rose by 2.00 mL, then the volume of copper is 2.00 mL.

The density is now; mass/volume

Mass = 17.92 g

Density = 17.92 g/2.00 mL

= 8.96 g/ml

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Answer:

10 g H₂SO₄

General Formulas and Concepts:

Chemistry - Stoichiometry

Explanation:

Step 1: Define

Given:   8 g SO₃

RxN:   SO₃ + H₂O → H₂SO₄

Step 2: Identify Conversions

Molar Mass of S - 32.07 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H - 1.01 g/mol

Molar Mass of SO₃ - 32.07 + 3(16.00) = 80.07 g/mol

Molar mass of H₂SO₄ - 2(1.01) + 32.07 + 4(16.00) = 98.09 g/mol

Step 3: Stoichiometry

[tex]8 \ g \ SO_3(\frac{1 \ mol \ SO_3}{80.07 \ g \ SO_3} )(\frac{1 \ mol \ H_2SO_4}{1 \ mol \ SO_3} )(\frac{98.09 \ g \ H_2SO_4}{1 \ mol \ H_2SO_4} )[/tex] = 9.80042 g H₂SO₄

Step 4: Check

We are given 1 sig fig. Follow sig fig rules and round.

9.80042 g H₂SO₄ ≈ 10 g H₂SO₄

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{178.5}{1000} \\ = 0.1785[/tex]

We have the final answer as

Hope this helps you

Answer:

Noble gases

Explanation:

The noble gases are non-metals that requires the highest amount of energy to remove an electron from their shells.

The reason for this difficult is that their electronic configuration confers a stable configuration them.

Answer:

Viruses can weaken your immune system. They make you sick. Some could even cause death.

Explanation:

I hope this helped I heard that song I forgot the name lol

Answer: 177600 J or 177.6kJ

Explanation:

For this problem, we need to use q = mcAT

we have m = 10000, and AT= 40. The specific heat of iron is 0.444.

So now we can plug it in: q = 10000*.444*40 = 177600 J or 177.6kJ

Answer:

1848000J

Explanation:

Given parameters:

Mass of iron  = 100kg

Temperature change  = 40°C

Unknown:

Energy needed to increase the temperature  = ?

Solution:

The amount of energy needed is given by the expression below:

     H  = m C Δt

m is the mass

c is the specific heat capacity

Δt is the change in temperature

  c for iron is 462J/kg°C

 Now insert the parameters and solve;

  H  = 100 x 462 x 40  = 1848000J

Answer:

C . a compressed spring

Answer:

I don't know that question answer because I am in 7 class so mind it

Answer:

Positive Geotropism means growth of the plants towards the Gravitational force. e.g.It means When a plant's root grows towards Gravitational force . It is positive geotropism. Negative Geotropism means growth of the plant against the Gravitational force. e.g. When a plant's steam grows towards sunlight.

Explanation:

Answer:

A- Uranium is not only the radioactive element

Answer:

Where are the categories, we need an image for reference or something to better understand the question

Explanation:

Greenhouse gasses in Earth's atmosphere affect Earth's temperature by making it hotter. Greenhouse gasses make the Earth warmer by trapping heat. You can think of greenhouse gasses as Earth's blanket.

Answer:

It effects the earth when we have more greenhouse gasses in the earth's atmosphere because it makes the earth more warmer which will cause more sunlight to hit earth because there is more heat near the earth's surface, and this will cause the temperatures to rise really high because of the heat.

Hope this helps!

Answer:A

Explanation:

Answer:

A. Accept electrons

Explanation:

The octet rule states that 8 electrons stabilizes a molecule. This means that oxygen will try to fill the two empty spots with electrons from other molecules. The Lewis Dot diagram shows these two empty spots with the empty circles at the bottom.

Lewis dot structures, also known as electron dot structures, are schematics that show the interatomic chemical bonds in a molecule. Additionally, they show how many lone pairs there are overall in each of the atoms that make up the molecule. Here 'O' accepts electrons. The correct option is A.

The electrical structures of the elements, especially the electron pairings, are reflected in the Lewis dot structures. Lewis structures can be viewed as "electron bookkeeping" and are a helpful approach to condensing some bonding-related information. Each dot in a Lewis dot structure corresponds to 1 electron.

Group 6 member oxygen still requires two additional electrons to complete its outer shell and remain stable. According to the octet rule, an object needs 8 valence electrons in the outer shell to be stable.

Thus the correct option is A.

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Answer:

Atoms of two different elements must have different atomic numbers.

Explanation:

It will be the same, as explained by conservation of mass.

hope this helped!

Answer:

350 g BaSO₄

General Formulas and Concepts:

Chemistry - Stoichiometry

Explanation:

Step 1: Define

1.5 mol BaSO₄

Step 2: Identify Conversions

Molar Mass of Ba - 137.33 g/mol

Molar Mass of S - 32.07 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of BaSO₄ - 137.33 + 32.07 + 4(16.00) = 233.4 g/mol

Step 3: Convert

[tex]1.5 \ mol \ BaSO_4(\frac{233.4 \ g \ BaSO_4}{1 \ mol \ BaSO_4} )[/tex] = 350.1 g BaSO₄

Step 4: Check

We are given 2 sig figs. Follow sig fig rules and round.

350.1 g BaSO₄ ≈ 350 g BaSO₄

Answer:

wind and water erosion

Answer:

C is the answer

Answer:

Balanced Equation

H₂ + Cl₂ → 2HCI

Answer:

Balanced Equation

H₂ + Cl₂ → 2HCI

Explanation:

i did it and 100%

Answer:

Write a different letter coefficient in front of each compound in the equation. Write algebraic expressions or rules for each element that equate its atoms on the LHS and RHS. Substitute the values into the other rules to obtain the balancing coefficients

Explanation:

Answer:

nonmetals

Explanation:

Answer:

Explanation:

q=mcat

q= 50g(4.184)(100-100)

q = 0

Answer:

9. 122.4 yards

10. 45.395 litres

Magnets attract iron due to the influence of their magnetic field upon the iron. Before a piece of iron enters the magnet, the polarization of the irons atoms is random. When exposed to the magnetic field, the atoms begin to align their electrons with the flow of the magnetic field, which makes the iron magnetized as well. This, in turn, creates an attraction between the two magnetized objects. This is why a piece of iron that is exposed to a magnet becomes magnetic for some time afterward.

Have the same number of protons but a different number of neutrons

The elements in nature have several types of isotopes

Isotopes are atoms whose no-atom has the same number of protons while still having a different number of neutrons.

So Isotopes are elements that have the same Atomic Number (Proton)

SO the Three Common Isotopes Of Oxygen :

₈¹⁶O, ₈¹⁷O, and ₈¹⁸O have :

1. The same number of protons = atomic number = 8

2. Have a different number of neutrons :(neutrons= mass number-atomic number)

₈¹⁶O : neutron = 16-8=8

₈¹⁷O : neutron = 17-8=9

₈¹⁸O : neutron = 18-8=10