Which compound has hydrogen bonding between its molecules?(1) CH4 (3) KH
(2) CaH2 (4) NH3

Answers

Answer 1

Answer: NH3 has Hydrogen bonding between its molecules.

Answer 2

Answer: Yup, NH3 it is. Hydrogen bonding usually occur between hydrogen and another electronegative atom such as oxygen, nitrogen or fluorine.

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A major function of your nose is cleaning the air you breathe. True False
An evaporation-crystallization process is used to obtain solid potassium sulfate from an aqueous solution of this salt. The fresh feed to the process contains 19.6 wt% K₂SO₄. The wet filter cake consists of solid K₂SO₄ crystals and a 40.0 wt% K₂SO₄ solution, in a ratio 10.0 kg crystal/kg solution. The filtrate, also a 40.0 wt% K₂SO₄ solution, is recycled to join the fresh feed. Of the water fed to the evaporator, 45.0% by weight is evaporated. The evaporator has a maximum capacity of 175. kg water evaporated/s. a) Assume the process is operating at maximum capacity. Draw and label a flowchart and do the degreeof-freedom analysis for the overall system, the recycle-fresh feed mixing point, the evaporator, and the crystallizer. b) Calculate the maximum production rate of solid K₂SO₄, the rate at which fresh feed must be supplied to achieve this production rate, and the recycle ratio kg/h recycled stream to kg/h fresh feed stream.
Number of protons in an atom's nucleus?: _________
11. Consider the elements neon, bromine, and phosphorus. Which has five electrons in its 4p sublevel?

How many oxygen atoms are contained in the following chemical formula? 2agno3 a. 2
b. 3
c. 5
d. 6

Answers

It would be: 2*3 = 6 oxygen atoms

OPTION D IS YOUR ANSWER......

The science that deals with the study of the stuff that makes up the universe is chemistry??

Answers

I believe that its chemistry

A placebo is a substance that is unlikely to affect the dependent variable. a. True
b. False

Answers

Answer : Option a) True.

Explanation : A placebo is a substance that is unlikely to affect the dependent variable. True as in a clinical trial for any change in the placebo arm is known as the placebo response, and the difference between this placebo response and the result of no treatment is called as the placebo effect. Therefore, a placebo may be given to any person in a clinical context in order to deceive that recipient into thinking that it is an part of active treatment. It actually resembles a drug but is not an actual active drug, so, it is clear that it will not affect dependent variable.

True. A placebo is a substance used to ensure that the independent variable is what is affecting the dependent variable. Usually used in drug trials

Which two elements have the most similar chemical properties?(1) Be and Mg (3) Cl and Ar
(2) Ca and Br (4) Na and P

Answers

Elements in the same groups shows similar chemical and physical properties. The elements having similar chemical properties are Be and Mg.

What are groups?

A group in periodic table is a column with elements of similar physical and chemical properties.

Both beryllium (Be) and magnesium are in group two with two valence electrons and both are metals. They have similar chemical and physical properties.

Cl is in 17th group and Ar is a 18th group element. They do not show any similarity in chemical properties. One is halogen which is unstable and the second one is noble gas which is stable. Thus no similarity.

Ca is a 2nd group element and Br is 17th group and they are different in chemical properties. One is metal and the second one is halogen with higher electronegativity.

Similarly, Na is in first group and P is 15th group element in periodic table in periodic table and does not show chemical similarities.

Therefore, the elements showing similar chemical properties are Be, Mg thus, option 1 is correct.

To learn more about groups in periodic table, refer the link below:

brainly.com/question/13219625

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atoms are made of 3 types of sub atomic particles- protons, neutrons and electrons

from these 3 particles, electrons are responsible for participating in chemical bonds. therefore chemical properties of elements are based on the number of electrons present.

valence electrons are the number of electrons in the outermost energy shell that are involved in chemical bonds.

atoms with same number of valence electrons are grouped in to columns called groups.

therefore elements of the same group have same number of valence electrons, hence similar chemical properties.

from the options given

only Be and Mg belong to the same group they both belong to group 2 with 2 valence electrons

therefore Be and Mg have similar chemical properties

answer is

1) Be and Mg

Cell references in a formula are called _____.

Answers

Cell references in a formula are called electrode potentials. Electrode potentials are standard voltages for half-cell potentials. All half-cell potentials use the Standard Hydrogen Electrode (SHE) as a universal reference for redox reactions. For hydrogen, the standard electrode potential is zero for all temperatures.

The "skin" of the statue of liberty is made of iron. true false