CHEMISTRY HIGH SCHOOL

Which of the following reactant pairs will not react together to produce a reaction? Rb + CaCl2 K + H2O Al + CoPO4 Ni + FeO

Answers

Answer 1
Answer:

If you guys are still wondering which one is right, the answer is Ni + FeO


Answer 2
Answer:

i think it might be Ni + FeO

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Hydrogen bonding occurs in molecules when a _____________. (1 point)hydrogen atom forms a covalent bond with one other atom.
hydrogen atom forms covalent bonds with more than one atom.
hydrogen atom of a polarized molecule bonds with an electronegative atom
hydrogen atoms form an ionic bond with one other atom

Answers

Answer: hydrogen atom of a polarized molecule bonds with an electro negative atom.

Explanation:

Hydrogen bonds are special type of dipole dipole forces which are formed when hydrogen bonds with an electro negative element. Hydrogen bonds are strongest type of bonds .Example: Bond between Oxygen of one water molecule to the hydrogen of another water molecule as shown in the image below.

Covalent bonds are formed by sharing of electrons among non metals.

Ionic bond is formed by transfer of electrons between metals and non metals.

Answer:

No because hydrogen can only form these bonds with highly electronegative atoms.

Explanation:

What is an ionic bond

Answers

Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.

Answer:

Ionic bond is formed by the cations and anions and their attractive forces.

Siobhan wants to measure the mass of a bag of flour. What should she do?

Answers

The most common mistake when people want to measure the mass is they cannot tell the difference between weight and mass.

When you simply put the flour on a normal scale, you're measuring it's weight because it also included the gravitational pull which make the results larger then the original mass.

The measure the mass of the flour she can either :
- Go to and put it on a normal scale in an area with zero gravity
- or she can use some instrument called "balance scale" , in which she can measure the mass from different altitude and compared it

If you are using a thermometer, you are measuring the

Answers

Fahrenheit (temperature) Is it asking in science?  

What quantity can be calculated for a solid compound, given only the formula of the compound and the periodic table of elements

Answers

When you have both of these ( The periodic table of elements and the formula of your compound) you are able to calculate the R.M.M ( Relative atomic mass) of that compound.
For example the formula of a NaCl ( Table salt ) has the elemnt Na and Cl.
We look at the atomic mass of both of these compounds
Na - 23
Cl - 35.5
R.M.M = 23 +35.5 = 58.5
Hope this helps :).

Please help! Multiple choice question! Which of the following gradients allow oxygen to leave the blood and enter body tissues and carbon dioxide to leave body tissues and enter the blood?

A. High concentration of oxygen in the blood; high concentration of carbon dioxide in the body tissues
B. Low concentration of oxygen in the blood; high concentration of carbon dioxide in the body tissues
C. High concentration of oxygen in the blood; low concentration of carbon dioxide in the body tissues
D. Low concentration of oxygen in the blood; low concentration of carbon dioxide in the body tissues

Answers

Answer:

A. High concentration of oxygen in the blood; high concentration of carbon dioxide in the body tissues

Explanation:

Diffusion occurs from a region of higher concentration to a region of lower concentration. Diffusion occurs against a concentration gradient.

High concentration of oxygen in the blood causes oxygen to leave the blood and enter body tissues.  High concentration of carbon dioxide  in the body tissues causes carbon dioxide to leave body tissues and enter the blood.

According to my mind and my biology test, it is B) Low concentration of oxygen IN THE BLOOD; high concentration co2 in the tissue
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