final exam
Calcium carbonate was placed in a flask on a balance, and dilute hydrochloric acid was added. Carbon dioxide that was produced escaped from the flask. The total mass of the flask and its contents was recorded every 10 seconds. The diagram above shows a plot of the results. Between which of the following times was the reaction the fastest? ( look at the picture on the reiew)
0 and 10 seconds
How many liters are equivalent to five milliliters?
0.005 L
Which of the above elements is a positive ion with a charge of one? (look at the picture on the review)
1
Elements from which two groups in the periodic table would most likely combine with each other to form an ionic compound?
1 and 17
Give the correct charge: 6 p + 5 n + 7 e
1-
How many protons, neutrons, and electrons in a neutral atom of sodium?
11p,12n,11e
A neutral atom of aluminum-27 contains how many protons, neutrons, and electrons?
13 electrons, 13 protons, and 14 neutrons.
?Al + ?HCl ?AlCl 3 + ?H 2 Which set of coefficients will balance this equation?
2,6,2,3
How many grams of sodium chloride are required to prepare 500.0 mL of a 0.100 M solution?
2.93g
The volume of Object X is approximately (look at the picture on the review)
25ml
How should 0.000365 be expressed in proper scientific notation?
3.65x 10-4
A student used the above ruler to measure the length of a nail. The length of this nail, according to the precision of the ruler, is ( look at the picture on review)
3.75 cm
How many valence electrons does a neutral atom of silicon have?
4
When the above equation is balanced, the coefficient of the hydrochloric acid will be (look at the picture on the review)
6
Ulcers are often caused by an excess of stomach acid. Milk of magnesia is often used to soothe the irritation. Milk of magnesia is probably a
A base
What is the correct Lewis dot structure for arsenic?
As
The smallest part of an element or molecule . Building block of all things.
Atoms
What is the main similarity among elements in group 2
Chemical properties.
A balanced chemical equation has equal numbers of atoms of each type on both sides of the equation. This illustrates the principle of
Conservation of mass.
Atoms of the same element must have
Contain the same number of protons.
The correct formula for copper (I) bromide is
CuBr
The correct name for P2O5 is
Diphosphourus pentoxide
Negative particles in orbits around the atom
Electrons
A substance in which all of the atoms are the same.
Element
If a lab group were using hydrochloric acid to perform a substitution reaction, which precaution would not be a concern? (look at the picture on the review)
Flammability
Which element naturally occurs as a diatomic molecule?
H
The energy required to melt a solid into a liquid is called
Heat of fusion
The following data was collected. The volume of the gas is known to be 2.20 L. ( look at the picture on review)
Low accuracy and high precision.
Which formula is used to determine the half-life of a radioactive element?
M(f)=M(i).(0.5)
The formula for dinitrogen tetroxide is
N2O4
Which of these elements contains four valence electrons? ( look at picture on the review)
Na3BrO3
Center of the atom; contains protons and neutrons
Nucleus
Ions of an element have different
Number of electrons
In chemical compounds, covalent bonds form when
Pairs of electrons are shared between two non metal atoms.
The atomic number corresponds to an atom's number of
Protons
Each balloon was filled with an identical number of moles of gas. Which of the following best explains why balloon B is larger than balloon A? ( look at the review)
The gas in ballon B is warmer.
Give the correct charge: 6 p + 7 n + 6 e
neutral
