Chemistry

Which pair of elements are most likely to form a molecular compound?Nitrogen and Hydrogen Calcium and CopperChlorine and NeonPlease help! I will mark brainliest if correct!
2 Answers
Sodium chloride can be used to preserve meat because
1 Answer
You come across a mysterious substance that has a mass of 1.8225 x 10 to the power of 2gand a volume of 0.025 L (1L = 1000 mL). Using the density formula what is the density
1 Answer
A black bear can run 35.0 mph how long will it take to run 1.95 x 10^4?A. 129B. 0.360C. None of the above D. 0.106E. 13
1 Answer
During a change in state, energy is transferred in the form of heatlightmoisturemotion
2 Answers
The mass of an object is 13.76 g. the volume of the object is 2.83 ml. what is the density of the object to the correct number of significant figures?
1 Answer
What is the correct order of star colors from hottest to coolest?white, yellow, red, blueyellow, orange, white, redred, orange, yellow, blue-whiteblue, white, yellow-white, orange
2 Answers
The hottest place in California is Death Valley with a record temperature of 130 F. Calculate the temperature in C and K.
1 Answer
A horse traveled a distance of 20 miles in 2hours. What was the horse's speed?
2 Answers
What happens to particles in a sample of liquid when the liquid is heated and cooled?
1 Answer
Explain the term catalyst and how it affects the rate of a chemical reaction.
1 Answer
Isotopes haveQuestion 1 options:A) different numbers of both protons and neutrons in their nuclei.B) a different number of neutrons in their nuclei.C) a different number of protons in their nuclei.D) a different number of electrons.Question 2 (5 points) An aqueous solutionQuestion 2 options:A) must contain three or more substances.B) is a single-phase heterogeneous mixture.C) has water as the solvent.D) has water as the solute.Question 3 (5 points) Which of the following is a homonuclear diatomic molecule?Question 3 options:A) NH3B) COC) 2CO2D) H2Question 4 (5 points) Given a container of a solution of 5% HCl, all samples tested from this same bottle will have the same mass ratio of hydrogen to chlorine. This is an application ofQuestion 4 options:A) the law of conservation of energy.B) the law of multiple proportions.C) the law of conservation of mass.D) the law of constant composition.Question 5 (5 points) Elements in the same periodQuestion 5 options:A) have the same principal quantum number.B) form bonds with the same type of elements.C) have the same number of valence electrons.D) have the same number of protons.
1 Answer
Explain the term rate of a chemical reaction.
1 Answer
I need help assappp ...........
2 Answers
What type of reaction is the equation 2NaCl 2Na +Cl2?
1 Answer
Where in equation for photosynthesis does carbon dioxide belong
1 Answer
The sulfuric acidcatalyzed reaction of isopentyl alcohol with acetic acid to form isopentyl acetate is performed. This reaction does not proceed to completion. After the reaction is heated under reflux for an hour, the product mixture is washed with aqueous sodium bicarbonate solution, and the organic layer is thoroughly dried. A distillation of the organic layer is then performed. Given the boiling points listed below, select the compound that will distill first.Compound Boiling point, acetic acid 118 isopentyl acetate 142 isopentyl alcohol 130 sulfuric acid water 290
1 Answer
Which of the following is true for polar jet streams? They bring cool air. They bring warm air. They blow at the equator. They blow from north to south.
2 Answers
Which statement best describes balancing equations and the law of conservation of mass?O There are more atoms in the reactants than in the products, and the total mass is the same in the reactants and inthe productsO The number of atoms is the same in the reactants and in the products, and the total mass is the same in thereactants and in the productsO There are fewer atoms in the reactants than in the products, and the total mass is less in the reactants than in theproductsThere are more atoms in the reactants than in the products, and the total mass is higher in the reactants than inTomsthe products
2 Answers
a sample of alcohol has a density 0.82 g/ml.what is the mass of 5500 mL of the alcohol
1 Answer
Which noble gases is closest to magnesium? On the periodic table? What must happen if a magnesium atom for it to have an electron arrangement similar to that of a noble gas?
2 Answers
Mass and energy are conservedQuestion 16 options:A) only in chemical changes.B) in chemical changes and physical changes.C) always in physical changes and sometimes in chemical changes.D) only in physical changes.Question 17 (5 points) Which of the following can't be broken down any further chemically?Question 17 options:A) CompoundsB) ElementsC) MatterD) MoleculesQuestion 18 (5 points) A/an _______ is the smallest unit of matter that has the characteristics of a chemical element.Question 18 options:A) atomB) protonC) moleculeD) electronQuestion 19 (5 points) The distance between consecutive peaks or troughs in a wave isQuestion 19 options:A) frequency.B) displacement.C) amplitude.D) wavelength.Question 20 (5 points) The phase transition of dry ice (frozen carbon dioxide) to gas is an example ofQuestion 20 options:A) condensation.B) sublimation.C) deposition.D) vaporization.
1 Answer
Which is a dominant trait that Mendel observed in pea plantA. Bumpy podsB. Short heightC. Yellow seedsD. White flowersit is not A
2 Answers
how many molecules are in CO
2 Answers