20-20=X what is X? I don't know please help me

Answers

Answer 1

Answer: Sure you do. If you have 20 pennies in your pocket and somebody reaches into your pocket and takes 20 pennies out how many pennies are left in your pocket ? That's 'x'.

Related Questions

Each sheet of metal on a roof is parallel to the rest of the sheets of metal. If the first sheet of metal is perpendicular to the top line of the roof, what can you conclude about the rest of sheets of metal? Justify your answer.a. The sheets of metal are all perpendicular to the top line of the roof by the Alternate Interior Angles Theorem.b. The sheets of metal are all perpendicular to the top line of the roof by the Transitive Property of Parallel Lines.c. The sheets of metal are all perpendicular to the top line of the roof by the Converse of the Same-Side Interior Angles Theorem.
Paintball is a popular recreational activity that uses a metal tank of compressed carbon dioxide or nitrogen to launch small capsules of paint. A typical tank has a volume of 508 cubic centimeters. A 340. gram sample of carbon dioxide is added to the tank before it is used for paintball. At 20.oC, this tank contains both CO2(g) and CO2(l). After a paintball game, the tank contains only CO2(g).Determine the total number of moles of CO2 added to the tank before it is used for paintball.
1. Mendeleev organized elements in his periodic table in order of increasing ____________________. 2. You are given the melting points of three unknown substances and are asked to predict which one is an ionic compound. You would select the compound with the ____________________ melting point. 3. Two factors that determine whether a molecule is polar are the types of atoms in the molecule and the ____________________ of the molecule. 4. According to John Dalton’s observations, when elements combine in a compound A. The ratio of their masses is always the same. B. Each element contributes an equal number of atoms. C. Their volumes are always equal. D. Their masses are always equal. 5. Democritus thought that matter was made of tiny particles A. Of earth, air, fire, and water. B. That could not be divided. C. That could be divided. D. That were all round and smooth 6. Rutherford’s gold foil experiment provided evidence for which of the following statements? A. Negative and positive charges are spread evenly throughout an atom. B. Alpha particles have a positive charge. C. Gold is not as dense as previously thought. D. There is a dense, positively charged mass in the center of an atom. 7. Which statement about subatomic particles is true? A. Protons, neutrons, and electrons all have about the same mass. B. Unlike protons or neutrons, electrons have no mass. C. Neutrons have no charge and no mass. D. An electron has far less mass than either a proton or neutron. 8. Which statement is true about oxygen-17 and oxygen-18? A. They do not have the same number of protons. B. Their atoms have an identical mass. C. They are isotopes of oxygen. D. They have the same mass number. 9. Which statement accurately represents the arrangement of electrons in Bohr’s atomic model? A. Electrons vibrate in fixed locations around the nucleus. B. Electrons travel around the nucleus in fixed energy levels with energies that vary from level to level. C. Electrons travel around the nucleus in fixed energy levels with equal amounts of energy. D. Electrons travel randomly in the relatively large space outside the nucleus. 10. What does the electron cloud model describe? A. The most likely locations of electrons in atoms B. The precise locations of electrons in atoms C. The number of electrons in an atom D. The mass of the electrons in an atom 11. What is the difference between an atom in the ground state and an atom in an excited state? A. The atom in the ground state has less energy and is less stable than the atom in an excited state. B. The atom in an excited state has one fewer electron than the atom in the ground state. C. The atom in an excited state has more energy and is less stable than the atom in the ground state. D. The atom in an excited state has one more electron than the atom in the ground state. 12. The usefulness of Mendeleev’s periodic table was confirmed by A. the discovery of subatomic particles. B. its immediate acceptance by other scientists. C. the discovery of elements with predicted properties. D. the discovery of the nucleus. 13. Atoms of the most reactive elements tend to have A. one or seven valence electrons. B. eight valence electrons. C. four or five valence electrons. D. no valence electrons.
Which temperature change would cause the volume of a sample of an ideal gas to double when the pressure of the sample remains the same?
The equation below shows the decomposition of lead nitrate. How many molecules of PbO are produced when 11.5 g NO2 is formed?2Pb(NO3 )2 (s) → 2PbO(s) + 4NO2 (g) + O2 (g)

A beaker contains three solids: flour, sugar, and baking soda. Whichdescribes the contents of the beaker? *

Answers

Answer: It is a Heterogeneous mixture.

Final answer:

The beaker contains a mixture of three solids, namely flour, sugar, and baking soda. These components retain their properties in the mixture and are not chemically combined.

Explanation:

The contents of the beaker can be described as a mixture. A mixture is a combination of two or more substances that are not chemically combined. In this case, the beaker contains flour, sugar, and baking soda. These are solid substances that maintain their own properties in the mixture. They're simply combined in the same space (the beaker), but they are not interacting on a molecular level to form a new substance.

Learn more about mixtures here:

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26.0 g of a liquid that has a density of 1.44 g/mL needs to be measured out in a graduated cylinder. what volume should be used

Answers

Answer: The volume of liquid used will be 18.055 mL.

Explanation:

To calculate the volume of liquid, we use the equation for density which is:

$\text{Density}=\frac{\text{Mass}}{\text{Volume}}$

We are given:

Mass of the liquid = 26 g

Density of the liquid = 1.44 g/mL

Volume of the liquid = ? mL

Putting values in above equation, we get:

$1.44g/mL=\frac{26g}{\text{Volume of the liquid}}\n\n\text{Volume of the liquid}=18.055mL$

Hence, the volume of liquid used will be 18.055 mL.

As Density = Mass/Volume
Mass = 26.0g
Density = 1.44g/mL
Therefore Volume = Mass/Density
=> Volume = 26.0/1.44 = 18.055... = 18.1mL (to 3 sig figs)

What is the formula of nitrous acid

Answers

The formula for nitrous acid is HN02.

How many grams of CO2 are in 2.1 mol of the compound?

Answers

Answer: Chemical Reactions,Acids, and Bases Practice

1. 2Na+Br2--->2NaBr

2. 92.4g

3. Volume of the solution

4. Reacts with metals

5. Exothermic

6. Conserved

The molar mass of CO2 is 28 grams per mole. If you aregiven 2.1 moles of CO2 and you are required to find the grams of this compound,simply multiply 28 grams per mole of CO2 by 2.1 moles of CO2 and you will get 58.8grams of CO2.

Bromine has two isotopes 79Br and 81Br, whose masses (78.9183 and 80.9163 amu) and abundances (50.69% and 49.31%, respectively) were determined in earlier experiments. Calculate the average atomic mass of bromine based on these experiments.

Answers

Answer:

Average atomic mass = 79.9034 amu

Explanation:

The formula for the calculation of the average atomic mass is:

$Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}* {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}* {Mass\ of\ the\ second\ isotope})$

Given that:

For first isotope:

% = 50.69 %

Mass = 78.9183 amu

For second isotope:

% = 49.31 %

Mass = 80.9163 amu

Thus,

$Average\ atomic\ mass=(50.69)/(100)* {78.9183}+(49.31)/(100)* {80.9163}\ amu$

$Average\ atomic\ mass=40.0036+39.8998\ amu$

Average atomic mass = 79.9034 amu

How does the VSPER theory explain molecular shapeA. Electron pair attractions pull atoms together
B. Electron pairs repelling each other push atoms apart
C. Valence electrons modify core electron orbitals
D. Intermolecular forces distort electron bonds

Answers

Answer:

B. Electron pairs repelling each other push atoms apart

Explanation:

The VESPR theory explains molecular shape by suggesting that electron pairs repelling each other push atoms apart.

If an atom is bonded to two or more other kinds of atoms as in many covalent molecules and ions, the shape of the system is determined by the geometry of the bonds around the central atom.

The variations in the bond angles of such molecules is explained by the valence shell electron pair repulsion theory.
All the electrons will orient themselves in such a way to minimize the electrostatic repulsion between them.
The repulsions determines the geometry of the covalent bonds around the central atom.

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If you determined that the volume of a silver bar is 100.mL,how many atoms of silver would be in the bar? The density of silver is 10.5g/mL. 271

“Gasoline boils at a relatively low temperature (about 150°C). The kerosene is removed at around 200°C, followed by diesel oil at 300°C and fuel oil at around 370°C.” What topic is the teacher most likely talking about?