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4 years ago

Name the compound formed when a copper cation that has a 2+ charge combines with a bromine anion that has a 1- charge.

2 answers:

6 0

The compound that is formed when a copper cation and a bromine anion reacts would be Copper (II) bromide. It will have a chemical formula CuBr2. This reaction is a synthesis reaction where two substances reacts to form one product.

Phoenix [80]4 years ago

4 0

Answer:

The compound is called copper (II) bromide or cupric bromide.

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A gold-colored pebble is found in a stream. Its mass is 23.2 mg and its volume is 1.20 mm3. What is its density in grams per cub

Lilit [14]

Answer:

The density in g/cm3 is 1.9333(put a line above the 3's to show it's repeating).

And no it is not gold because the density of gold in g/cm3 is 19.3.

Explanation:

Divide the mass by the volume in order to get an object's Density.

so, 23.2 divided by 1.20 mm3

=1.93333333 g/cm3

That is the density then you find out the density of gold in grams per cubic centimeter, that is 19.3 g/cm3

For example, gold will always have a density of 19.3 g/cm3; if a mineral has a density other than that, it isn't gold.

4 0

3 years ago

Write the following in scientific notation. a) 4,502,000 b) 450 c) 0.000458 d) 0.245

kykrilka [37]

Answer:

a 4.502 × 10 6

b 4.5 × 10 2

c 4.58 × 10 -4

d 2.45 × 10 -1

Explanation:

5 0

4 years ago

A farmer wants to know if a new pesticide will produce better tomatoes than

iogann1982 [59]

Answer:

D. Using the new pesticide produces bigger tomatoes than using the

old pesticide.

Explanation:

This hypothesis is best to test for the effect of the new pesticide on the tomato plant.

A pesticide is chemical formulation used to kill pests of farm crops.

Pests prevents the healthy and proper growth of plants thereby resulting in poor yield on the farm.

For the farmer to ascertain the effect of the pesticide on his farm crop, he must compare the yield of his produce. Some tomato might grow well but would not bear good fruit. If the farmer focuses on the fruit produced, he would have derieved a good hypothesis in his experiment.

4 0

4 years ago

Explain what a chemical reaction is and moles

Delvig [45]

Answer:

A process during which chemical bonds between atoms are broken and new ones are formed, producing one or more substances.

Moles are the amount of substance that contains as many particles.

Explanation:

A chemical reaction is when a chemical change occurs for example when a nail comes into contact with air and is then exposed to air it begins to rust. It forms a red-brown substance which changes the chemical composition of the original compound.

Examples of chemical reactions:

Combustion

Oxidation (rusting)

Cooking an egg

Photosynthesis

Digestion

Fireworks

Paper Burnin

The mole is the amount of substance that contains as many particles (molecules, ions or atoms) as there are in 12g of carbon.

1 mol is the amount of substance that contains the same number of particles as there are atoms in 12.0 g of carbon-12 and that number is referred to as Avogardo's constant (6.022 x $10^{23}$ ).

3 0

2 years ago

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the

Ivan

Answer:

300 J.

Explanation:

The first law of thermodynamics is the law that demonstrates the conservation of energy.

It states that t<em>he total energy of an isolated system can not be created or destroyed, but it may be transformed into another form</em>.

The energy released to the room is 300 J.

So, according to the law of conversation of energy; the amount of heat removed from food inside of the refrigerator is 300 J.

7 0

3 years ago