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Lelu [443]
2 years ago
13

True or false. an object's weight is constant in all circumstances​

Chemistry
1 answer:
Sindrei [870]2 years ago
3 0

Answer: False

Explanation: False, what if its in space?

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How many moles of solute are contained in a 250 ml solution that has a concentration of.85 m?
oksano4ka [1.4K]
Volume = 250 mL in liters : 250 / 1000 => 0.25 L

Molarity = 0.85 M

Number of moles:

n = M x V

n = 0.85 x 0.25

n = 0.21 moles

Choice B
3 0
3 years ago
3. What is the gram-formula mass of (NH4)3PO4?
nasty-shy [4]
The gram-formula mass means that the mass of one mole molecule. Then you just need to calculate the elements together. So the gram-formula mass of (NH4)3PO4 is equals to (14+4)*3+31+16*4= 149g/mol. So the answer is (c)
4 0
3 years ago
True or False. Solutions can be heterogenous.
Usimov [2.4K]

Answer: False

Explanation: Solutions can never be Heterogenous

7 0
2 years ago
Read 2 more answers
The atomic number identifies which of the following?
creativ13 [48]

Answer: protons

Explanation:

The atomic # identifies the amount of protons in an atom

4 0
2 years ago
Al wonders if adding salt to water will affect how long it takes the water to
love history [14]

The hypothesis is that salt water freezes faster than fresh water.

The dependent variable is time taken for ice to appear.

The independent variable is presence or absence of salt

The constants are the amount of water in each tray, freezing conditions and length of time of exposure to freezing condition.

The control group is the tray to which salt was not added

The experimental group is the tray to which salt was added

The presence of solutes in a solution causes the freezing point depression.

A solution is made up of a solute and a solvent. In the presence of a solute, the freezing point of a pure solvent is decreased. This is because freezing point is a colligative property.

Colligative properties depend on the amount of solute present.

Hence, the pure water freezes faster (ice begin to appear earlier) than the salt water.

The hypothesis put forward in this experiment was found to be invalid by the experiment.

For more about colligative properties, see

brainly.com/question/10323760

6 0
3 years ago
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