Fill in the blank to balance the following chemical equation:

2 al + h2so4 --> al2(so4)3 + 3 h2

match each chemical reaction to its type:

c3h8 + 5 o2 --> 3 co2 + 4 h2o

2 h2o2 --> 2 h2o + o2

agno3 + kbr --> agbr + kno3

cucl2 + zn --> zncl2 + cu

cao + h2o --> ca(oh)2

a.
combustion

b.
synthesis

c.
decomposition

d.
single replacement

e.
double replacement

you suspect one of the products of a single replacement is hydrogen gas. how might you experimentally confirm your prediction? choose the best option.

watch for bubbles to form in solution which indicates a gas was produced.

waft to detect an odor from the test tube.

place a burning splint near the end of the test tube and listen for a 'pop' sound.

hydrogen gas is never a product in a chemical reaction.

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Will mark brainliest how many electrons can be held in the energy level n = 4?

A4.86 g piece of metal was placed in a graduated cylinder containing 15.5 ml of water. the water level rose to 17.3 ml. what is the density of the metal. i need the steps of how to solve it to so i can use a formula to work out other problems.

Electromagnets coils of wire paper clips picked up 10 3 15 6 20 9 25 12 ms. owens' class was studying magnets. ms. owens showed her students how to make an electromagnet using a nail, a d-cell battery, and plastic coated wire. the students wrapped the wire around the nail and then attached the ends to the battery. when they were finished, they tested their magnets by investigating how many paperclips their magnets could pick up. they also tested whether they could increase the strength of their electromagnets by using more coils of wire. they recorded the class average of their results in the data table seen here. ms. owens asked her students to graph their data in a line graph. how should the students label the x-axis on their line graph? a) size of battery b) number of paper clips c) number of coils of wire d) strength of electromagnet